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7219dec2558202d4b5bb464f61dcc6af0f4425e4
hhvm/hphp/runtime/vm/translator/hopt/codegen.cpp
T
bsimmers 7219dec255 Implement more final operations in VectorTranslator 
Most of this is pretty boring and mechanical. I added
VectorProp and VectorElem flags to help deal with the increasing
number of vector-related opcodes.
2013-03-22 11:48:50 -07:00

4824 linhas
154 KiB
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Original Anotar Histórico

/*
+----------------------------------------------------------------------+
| HipHop for PHP |
+----------------------------------------------------------------------+
| Copyright (c) 2010- Facebook, Inc. (http://www.facebook.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
*/
#include "runtime/vm/translator/hopt/codegen.h"
#include <string.h>
#include "folly/ScopeGuard.h"
#include "util/trace.h"
#include "util/util.h"
#include "runtime/base/array/hphp_array.h"
#include "runtime/base/comparisons.h"
#include "runtime/base/complex_types.h"
#include "runtime/base/runtime_option.h"
#include "runtime/base/string_data.h"
#include "runtime/base/types.h"
#include "runtime/ext/ext_continuation.h"
#include "runtime/vm/bytecode.h"
#include "runtime/vm/runtime.h"
#include "runtime/vm/stats.h"
#include "runtime/vm/translator/targetcache.h"
#include "runtime/vm/translator/translator-inline.h"
#include "runtime/vm/translator/translator-x64.h"
#include "runtime/vm/translator/translator-x64-internal.h"
#include "runtime/vm/translator/translator.h"
#include "runtime/vm/translator/types.h"
#include "runtime/vm/translator/x64-util.h"
#include "runtime/vm/translator/hopt/ir.h"
#include "runtime/vm/translator/hopt/linearscan.h"
#include "runtime/vm/translator/hopt/nativecalls.h"
using HPHP::DataType;
using HPHP::TypedValue;
using HPHP::VM::Transl::TCA;
using namespace HPHP::VM::Transl::TargetCache;
// emitDispDeref --
// emitDeref --
//
// Helpers for common cell operations.
//
// Dereference the cell whose address lives in src into dest.
/*static */void
emitDispDeref(X64Assembler &a, PhysReg src, int disp, PhysReg dest) {
a. load_reg64_disp_reg64(src, disp + TVOFF(m_data), dest);
}
/*static*/ void
emitDeref(X64Assembler &a, PhysReg src, PhysReg dest) {
emitDispDeref(a, src, 0, dest);
}
/* static */ void
emitDerefIfVariant(X64Assembler &a, PhysReg reg) {
emitCmpTVType(a, HPHP::KindOfRef, reg[TVOFF(m_type)]);
a.cload_reg64_disp_reg64(CC_Z, reg, 0, reg);
}
namespace HPHP {
namespace VM {
namespace JIT {
namespace {
//////////////////////////////////////////////////////////////////////
using namespace Util;
using namespace Transl::reg;
static const HPHP::Trace::Module TRACEMOD = HPHP::Trace::hhir;
using Transl::rVmSp;
using Transl::rVmFp;
const int64_t kTypeShiftBits = sizeof(int32_t) * CHAR_BIT;
uint64_t toDataTypeForCall(Type type) {
return (uint64_t)type.toDataType() << (sizeof(int32_t) * CHAR_BIT);
}
int64_t spillSlotsToSize(int n) {
return n * sizeof(int64_t);
}
void cgPunt(const char* file, int line, const char* func) {
if (RuntimeOption::EvalDumpIR) {
HPHP::Trace::trace("--------- CG_PUNT %s %d %s\n", file, line, func);
}
throw FailedCodeGen(file, line, func);
}
#define CG_PUNT(instr) do { \
if (tx64) { \
cgPunt( __FILE__, __LINE__, #instr); \
} \
} while(0)
struct CycleInfo {
int node;
int length;
};
struct MoveInfo {
enum Kind { Move, Xchg };
MoveInfo(Kind kind, int reg1, int reg2):
m_kind(kind), m_reg1(reg1), m_reg2(reg2) {}
Kind m_kind;
PhysReg m_reg1, m_reg2;
};
template <int N>
void doRegMoves(int (&moves)[N], int rTmp,
std::vector<MoveInfo>& howTo) {
assert(howTo.empty());
int outDegree[N];
CycleInfo cycles[N];
int numCycles = 0;
// Iterate over the nodes filling in outDegree[] and cycles[] as we go
{
int index[N];
for (int node = 0; node < N; ++node) {
// If a node's source is itself, its a nop
if (moves[node] == node) moves[node] = -1;
if (node == rTmp && moves[node] >= 0) {
// ERROR: rTmp cannot be referenced in moves[].
assert(false);
}
outDegree[node] = 0;
index[node] = -1;
}
int nextIndex = 0;
for (int startNode = 0; startNode < N; ++startNode) {
// If startNode has not been visited yet, begin walking
// a path from start node
if (index[startNode] < 0) {
int node = startNode;
pathloop:
index[node] = nextIndex++;
if (moves[node] >= 0) {
int nextNode = moves[node];
++outDegree[nextNode];
if (index[nextNode] < 0) {
// If there is an edge from v to nextNode and nextNode has not been
// visited, extend the current path to include nextNode and recurse
node = nextNode;
goto pathloop;
}
// There is an edge from v to nextNode but nextNode has already been
// visited, check if nextNode is on the current path
if (index[nextNode] >= index[startNode]) {
// nextNode is on the current path so we've found a cycle
int length = nextIndex - index[nextNode];
CycleInfo ci = { nextNode, length };
cycles[numCycles] = ci;
++numCycles;
}
}
}
}
}
// Handle all moves that aren't part of a cycle
{
int q[N];
int qBack = 0;
for (int node = 0; node < N; ++node) {
if (outDegree[node] == 0) {
q[qBack] = node;
++qBack;
}
}
for (int i = 0; i < qBack; ++i) {
int node = q[i];
if (moves[node] >= 0) {
int nextNode = moves[node];
howTo.push_back(MoveInfo(MoveInfo::Move, nextNode, node));
--outDegree[nextNode];
if (outDegree[nextNode] == 0) {
q[qBack] = nextNode;
++qBack;
}
}
}
}
// Deal with any cycles we encountered
for (int i = 0; i < numCycles; ++i) {
if (cycles[i].length == 2) {
int v = cycles[i].node;
int w = moves[v];
howTo.push_back(MoveInfo(MoveInfo::Xchg, w, v));
} else if (cycles[i].length == 3) {
int v = cycles[i].node;
int w = moves[v];
howTo.push_back(MoveInfo(MoveInfo::Xchg, w, v));
int x = moves[w];
howTo.push_back(MoveInfo(MoveInfo::Xchg, x, w));
} else {
int v = cycles[i].node;
howTo.push_back(MoveInfo(MoveInfo::Move, v, rTmp));
int w = v;
int x = moves[w];
while (x != v) {
howTo.push_back(MoveInfo(MoveInfo::Move, x, w));
w = x;
x = moves[w];
}
howTo.push_back(MoveInfo(MoveInfo::Move, rTmp, w));
}
}
}
const char* getContextName(Class* ctx) {
return ctx ? ctx->name()->data() : ":anonymous:";
}
} // unnamed namespace
//////////////////////////////////////////////////////////////////////
ArgDesc::ArgDesc(SSATmp* tmp, bool val) : m_imm(-1), m_zeroExtend(false) {
if (tmp->getType() == Type::None) {
assert(val);
m_kind = None;
return;
}
if (tmp->getInstruction()->getOpcode() == DefConst) {
m_srcReg = InvalidReg;
if (val) {
m_imm = tmp->getValBits();
} else {
m_imm = toDataTypeForCall(tmp->getType());
}
m_kind = Imm;
return;
}
if (tmp->getType().isNull()) {
m_srcReg = InvalidReg;
if (val) {
m_imm = 0;
} else {
m_imm = toDataTypeForCall(tmp->getType());
}
m_kind = Imm;
return;
}
if (val || tmp->numNeededRegs() > 1) {
auto reg = tmp->getReg(val ? 0 : 1);
assert(reg != InvalidReg);
m_imm = 0;
// If val is false then we're passing tmp's type. TypeReg lets
// CodeGenerator know that the value might require some massaging
// to be in the right format for the call.
m_kind = val ? Reg : TypeReg;
// zero extend any boolean value that we pass to the helper in case
// the helper expects it (e.g., as TypedValue)
if (val && tmp->isA(Type::Bool)) m_zeroExtend = true;
m_srcReg = reg;
return;
}
m_srcReg = InvalidReg;
m_imm = toDataTypeForCall(tmp->getType());
m_kind = Imm;
}
const Func* CodeGenerator::getCurFunc() const {
return m_state.lastMarker ? m_state.lastMarker->func :
m_curTrace->front()->getFunc();
}
Address CodeGenerator::cgInst(IRInstruction* inst) {
Opcode opc = inst->getOpcode();
auto const start = m_as.code.frontier;
switch (opc) {
#define O(name, dsts, srcs, flags) \
case name: cg ## name (inst); \
return m_as.code.frontier == start ? nullptr : start;
IR_OPCODES
#undef O
default:
assert(0);
return nullptr;
}
}
#define NOOP_OPCODE(opcode) \
void CodeGenerator::cg##opcode(IRInstruction*) {}
#define PUNT_OPCODE(opcode) \
void CodeGenerator::cg##opcode(IRInstruction*) { CG_PUNT(opcode); }
#define CALL_OPCODE(opcode) \
void CodeGenerator::cg##opcode(IRInstruction* i) { cgCallNative(i); }
#define CALL_STK_OPCODE(opcode) \
CALL_OPCODE(opcode) \
CALL_OPCODE(opcode ## Stk)
NOOP_OPCODE(DefConst)
NOOP_OPCODE(DefFP)
NOOP_OPCODE(DefSP)
NOOP_OPCODE(Marker)
NOOP_OPCODE(AssertLoc)
NOOP_OPCODE(DefActRec)
NOOP_OPCODE(AssertStk)
NOOP_OPCODE(Nop)
NOOP_OPCODE(DefLabel)
CALL_OPCODE(AddElemStrKey)
CALL_OPCODE(AddElemIntKey)
CALL_OPCODE(AddNewElem)
CALL_OPCODE(ArrayAdd)
CALL_OPCODE(Box)
CALL_OPCODE(CreateCont)
CALL_OPCODE(FillContLocals)
CALL_OPCODE(NewArray)
CALL_OPCODE(NewTuple)
CALL_OPCODE(PrintStr)
CALL_OPCODE(PrintInt)
CALL_OPCODE(PrintBool)
CALL_OPCODE(DbgAssertPtr)
CALL_OPCODE(LdSwitchDblIndex);
CALL_OPCODE(LdSwitchStrIndex);
CALL_OPCODE(LdSwitchObjIndex);
CALL_OPCODE(RaiseUninitLoc)
CALL_OPCODE(WarnNonObjProp)
CALL_OPCODE(ThrowNonObjProp)
CALL_OPCODE(RaiseUndefProp)
// Vector instruction helpers
CALL_OPCODE(BaseG)
CALL_OPCODE(PropX)
CALL_OPCODE(CGetProp)
CALL_STK_OPCODE(VGetProp)
CALL_STK_OPCODE(BindProp)
CALL_STK_OPCODE(SetProp)
CALL_STK_OPCODE(SetOpProp)
CALL_STK_OPCODE(IncDecProp)
CALL_OPCODE(EmptyProp);
CALL_OPCODE(IssetProp);
CALL_OPCODE(ElemX)
CALL_STK_OPCODE(ElemDX)
CALL_OPCODE(CGetElem)
CALL_STK_OPCODE(VGetElem)
CALL_STK_OPCODE(BindElem)
CALL_OPCODE(ArraySet)
CALL_OPCODE(ArraySetRef)
CALL_STK_OPCODE(SetElem)
CALL_STK_OPCODE(SetOpElem)
CALL_STK_OPCODE(IncDecElem)
CALL_STK_OPCODE(SetNewElem)
CALL_STK_OPCODE(BindNewElem)
CALL_OPCODE(IssetElem)
CALL_OPCODE(EmptyElem)
#undef NOOP_OPCODE
#undef PUNT_OPCODE
// Thread chain of patch locations using the 4 byte space in each jmp/jcc
void prependPatchAddr(CodegenState& state, Block* block, TCA patchAddr) {
auto &patches = state.patches;
ssize_t diff = patches[block] ? (patchAddr - (TCA)patches[block]) : 0;
assert(deltaFits(diff, sz::dword));
*(int32_t*)(patchAddr) = (int32_t)diff;
patches[block] = patchAddr;
}
Address CodeGenerator::emitFwdJcc(Asm& a, ConditionCode cc, Block* target) {
assert(target);
Address start = a.code.frontier;
a.jcc(cc, a.code.frontier);
TCA immPtr = a.code.frontier - 4;
prependPatchAddr(m_state, target, immPtr);
return start;
}
Address CodeGenerator::emitFwdJmp(Asm& a, Block* target, CodegenState& state) {
Address start = a.code.frontier;
a.jmp(a.code.frontier);
TCA immPtr = a.code.frontier - 4;
prependPatchAddr(state, target, immPtr);
return start;
}
Address CodeGenerator::emitFwdJmp(Asm& a, Block* target) {
return emitFwdJmp(a, target, m_state);
}
Address CodeGenerator::emitFwdJcc(ConditionCode cc, Block* target) {
return emitFwdJcc(m_as, cc, target);
}
Address CodeGenerator::emitFwdJmp(Block* target) {
return emitFwdJmp(m_as, target);
}
// Patch with service request EMIT_BIND_JMP
Address CodeGenerator::emitSmashableFwdJmp(Block* target, IRInstruction* toSmash) {
Address start = m_as.code.frontier;
if (toSmash) {
m_tx64->prepareForSmash(m_as, TranslatorX64::kJmpLen);
Address tca = emitFwdJmp(target);
toSmash->setTCA(tca);
//assert(false); // TODO(#2012072): this path is supposed to be unused
} else {
emitFwdJmp(target);
}
return start;
}
// Patch with service request REQ_BIND_JMPCC_FIRST/SECOND
Address CodeGenerator::emitSmashableFwdJccAtEnd(ConditionCode cc, Block* target,
IRInstruction* toSmash) {
Address start = m_as.code.frontier;
if (toSmash) {
m_tx64->prepareForSmash(m_as, TranslatorX64::kJmpLen +
TranslatorX64::kJmpccLen);
Address tcaJcc = emitFwdJcc(cc, target);
emitFwdJmp(target);
toSmash->setTCA(tcaJcc);
} else {
emitFwdJcc(cc, target);
}
return start;
}
void CodeGenerator::emitJccDirectExit(IRInstruction* inst,
ConditionCode cc) {
if (cc == CC_None) return;
auto* toSmash = inst->getTCA() == kIRDirectJccJmpActive ? inst : nullptr;
emitSmashableFwdJccAtEnd(cc, inst->getTaken(), toSmash);
}
// Patch with service request REQ_BIND_JCC
Address CodeGenerator::emitSmashableFwdJcc(ConditionCode cc, Block* target,
IRInstruction* toSmash) {
Address start = m_as.code.frontier;
assert(toSmash);
m_tx64->prepareForSmash(m_as, TranslatorX64::kJmpccLen);
Address tcaJcc = emitFwdJcc(cc, target);
toSmash->setTCA(tcaJcc);
return start;
}
void emitLoadImm(CodeGenerator::Asm& as, int64_t val, PhysReg dstReg) {
as.emitImmReg(val, dstReg);
}
void emitMovRegReg(CodeGenerator::Asm& as, PhysReg srcReg, PhysReg dstReg) {
if (srcReg != dstReg) as.movq(srcReg, dstReg);
}
void shuffle2(CodeGenerator::Asm& a,
PhysReg s0, PhysReg s1, PhysReg d0, PhysReg d1) {
assert(s0 != s1);
if (d0 == s1 && d1 != InvalidReg) {
assert(d0 != d1);
if (d1 == s0) {
a. xchgq (s1, s0);
} else {
a. movq (s1, d1); // save s1 first; d1 != s0
a. movq (s0, d0);
}
} else {
if (d0 != InvalidReg) emitMovRegReg(a, s0, d0); // d0 != s1
if (d1 != InvalidReg) emitMovRegReg(a, s1, d1);
}
}
static void zeroExtendIfBool(X64Assembler& as, const SSATmp* src) {
if (src->isA(Type::Bool)) {
auto reg = src->getReg();
if (reg != InvalidReg) {
// zero-extend the bool from a byte to a quad
// note: movzbl actually extends the value to 64 bits.
as.movzbl(rbyte(reg), r32(reg));
}
}
}
static void prepBinaryXmmOp(X64Assembler& a, const SSATmp* l, const SSATmp* r) {
auto intoXmm = [&](const SSATmp* ssa, RegXMM xmm) {
RegNumber src(ssa->getReg());
if (ssa->getReg() == InvalidReg) {
src = rScratch;
assert(ssa->isConst());
a.mov_imm64_reg(ssa->getValBits(), rScratch);
}
if (ssa->isA(Type::Int | Type::Bool)) {
// Expand non-const bools to 64-bit.
// Consts are already moved into src as 64-bit values above.
if (!ssa->isConst()) zeroExtendIfBool(a, ssa);
// cvtsi2sd doesn't modify the high bits of its target, which can
// cause false dependencies to prevent register renaming from kicking
// in. Break the dependency chain by zeroing out the destination reg.
a. pxor_xmm_xmm(xmm, xmm);
a. cvtsi2sd_reg64_xmm(src, xmm);
} else {
a. mov_reg64_xmm(src, xmm);
}
};
intoXmm(l, xmm0);
intoXmm(r, xmm1);
}
static void doubleCmp(X64Assembler& a, RegXMM xmm0, RegXMM xmm1) {
a. ucomisd_xmm_xmm(xmm0, xmm1);
Label notPF;
a. jnp8(notPF);
// PF means the doubles were unordered. We treat this as !equal, so
// clear ZF.
a. or_imm32_reg64(1, rScratch);
asm_label(a, notPF);
}
void CodeGenerator::cgJcc(IRInstruction* inst) {
SSATmp* src1 = inst->getSrc(0);
SSATmp* src2 = inst->getSrc(1);
Opcode opc = inst->getOpcode();
ConditionCode cc = queryJmpToCC(opc);
Type src1Type = src1->getType();
Type src2Type = src2->getType();
// can't generate CMP instructions correctly for anything that isn't
// a bool or a numeric, and we can't mix bool/numerics because
// -1 == true in PHP, but not in HHIR binary representation
if (!((src1Type == Type::Int && src2Type == Type::Int) ||
((src1Type == Type::Int || src1Type == Type::Dbl) &&
(src2Type == Type::Int || src2Type == Type::Dbl)) ||
(src1Type == Type::Bool && src2Type == Type::Bool) ||
(src1Type == Type::Cls && src2Type == Type::Cls))) {
CG_PUNT(cgJcc);
}
if (src1Type == Type::Dbl || src2Type == Type::Dbl) {
prepBinaryXmmOp(m_as, src1, src2);
doubleCmp(m_as, xmm0, xmm1);
} else {
if (src1Type == Type::Cls && src2Type == Type::Cls) {
assert(opc == JmpSame || opc == JmpNSame);
}
auto srcReg1 = src1->getReg();
auto srcReg2 = src2->getReg();
// Note: when both src1 and src2 are constants, we should transform the
// branch into an unconditional jump earlier in the IR.
if (src1->isConst()) {
// TODO: use compare with immediate or make sure simplifier
// canonicalizes this so that constant is src2
srcReg1 = rScratch;
m_as.mov_imm64_reg(src1->getValRawInt(), srcReg1);
}
if (src2->isConst()) {
m_as.cmp_imm64_reg64(src2->getValRawInt(), srcReg1);
} else {
// Note the reverse syntax in the assembler.
// This cmp will compute srcReg1 - srcReg2
if (src1Type == Type::Bool) {
m_as. cmpb (Reg8(int(srcReg2)), Reg8(int(srcReg1)));
} else {
m_as.cmp_reg64_reg64(srcReg2, srcReg1);
}
}
}
emitJccDirectExit(inst, cc);
}
void CodeGenerator::cgJmpGt (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpGte (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpLt (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpLte (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpEq (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpNeq (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpSame (IRInstruction* inst) { cgJcc(inst); }
void CodeGenerator::cgJmpNSame(IRInstruction* inst) { cgJcc(inst); }
/**
* Once the arg sources and dests are all assigned; emit moves and exchanges
* to put all the args in desired registers.
*/
typedef Transl::X64Assembler Asm;
static void shuffleArgs(Asm& a, ArgGroup& args) {
// First schedule arg moves
for (size_t i = 0; i < args.size(); ++i) {
// We don't support memory-to-register moves currently.
assert(args[i].getKind() == ArgDesc::Reg ||
args[i].getKind() == ArgDesc::TypeReg ||
args[i].getKind() == ArgDesc::Imm ||
args[i].getKind() == ArgDesc::Addr ||
args[i].getKind() == ArgDesc::None);
}
// Handle register-to-register moves.
int moves[kNumX64Regs];
ArgDesc* argDescs[kNumX64Regs];
memset(moves, -1, sizeof moves);
memset(argDescs, 0, sizeof argDescs);
for (size_t i = 0; i < args.size(); ++i) {
auto kind = args[i].getKind();
if (!(kind == ArgDesc::Reg ||
kind == ArgDesc::Addr ||
kind == ArgDesc::TypeReg)) {
continue;
}
auto dstReg = args[i].getDstReg();
auto srcReg = args[i].getSrcReg();
if (dstReg == srcReg) {
// Ignore register-to-register moves whose src and dst registers
// are the same. But emit the code for load-effective-address
// operations whose src and dst registers are the same as
// doRegMoves won't handle those.
if (kind == ArgDesc::Addr) {
// an lea whose src and dest regs are the same
a. lea (srcReg[args[i].getImm().q()], dstReg);
} else if (args[i].isZeroExtend()) {
// if passing bool as TypedValue.m_data, must zero extend
a. movzbl (rbyte(dstReg), r32(dstReg));
}
continue;
}
moves[int(dstReg)] = int(srcReg);
argDescs[int(dstReg)] = &args[i];
}
std::vector<MoveInfo> howTo;
doRegMoves(moves, int(reg::rScratch), howTo);
for (size_t i = 0; i < howTo.size(); ++i) {
if (howTo[i].m_kind == MoveInfo::Move) {
if (howTo[i].m_reg2 == reg::rScratch) {
a. movq (howTo[i].m_reg1, howTo[i].m_reg2);
} else {
ArgDesc* argDesc = argDescs[int(howTo[i].m_reg2)];
if (argDesc->getKind() == ArgDesc::Reg ||
argDesc->getKind() == ArgDesc::TypeReg) {
if (argDesc->isZeroExtend()) {
a. movzbl (rbyte(howTo[i].m_reg1), r32(howTo[i].m_reg2));
} else {
a. movq (howTo[i].m_reg1, howTo[i].m_reg2);
}
} else {
assert(argDesc->getKind() == ArgDesc::Addr);
a. lea (howTo[i].m_reg1[argDesc->getImm().q()],
howTo[i].m_reg2);
}
}
} else {
a. xchgq (howTo[i].m_reg1, howTo[i].m_reg2);
ArgDesc* argDesc2 = argDescs[int(howTo[i].m_reg2)];
if (argDesc2->getKind() == ArgDesc::Addr) {
a. addq (argDesc2->getImm(), howTo[i].m_reg2);
} else if (argDesc2->isZeroExtend()) {
a. movzbl (rbyte(howTo[i].m_reg2), r32(howTo[i].m_reg2));
}
ArgDesc* argDesc1 = argDescs[int(howTo[i].m_reg1)];
if (argDesc1->getKind() == ArgDesc::Addr) {
a. addq (argDesc1->getImm(), howTo[i].m_reg1);
} else if (argDesc1->isZeroExtend()) {
a. movzbl (rbyte(howTo[i].m_reg1), r32(howTo[i].m_reg1));
}
}
}
// Handle const-to-register moves and type shifting
for (size_t i = 0; i < args.size(); ++i) {
if (args[i].getKind() == ArgDesc::Imm) {
emitLoadImm(a, args[i].getImm().q(), args[i].getDstReg());
} else if (args[i].getKind() == ArgDesc::TypeReg) {
a. shlq (kTypeShiftBits, args[i].getDstReg());
} else if (RuntimeOption::EvalHHIRGenerateAsserts &&
args[i].getKind() == ArgDesc::None) {
emitLoadImm(a, 0xbadbadbadbadbad, args[i].getDstReg());
}
}
}
void CodeGenerator::cgCallNative(IRInstruction* inst) {
using namespace NativeCalls;
Opcode opc = inst->getOpcode();
always_assert(CallMap::hasInfo(opc));
const CallInfo& info = CallMap::getInfo(opc);
ArgGroup argGroup;
for (auto const& arg : info.args) {
SSATmp* src = inst->getSrc(arg.srcIdx);
switch (arg.type) {
case SSA:
argGroup.ssa(src);
break;
case TV:
argGroup.typedValue(src);
break;
case VecKeyS:
argGroup.vectorKeyS(src);
break;
case VecKeyIS:
argGroup.vectorKeyIS(src);
break;
}
}
TCA addr = nullptr;
switch (info.func.type) {
case FPtr:
addr = info.func.ptr;
break;
case FSSA:
addr = inst->getSrc(info.func.srcIdx)->getValTCA();
break;
}
cgCallHelper(m_as,
addr,
info.dest != DestType::None ? inst->getDst(0) : nullptr,
info.sync,
argGroup,
info.dest);
}
void CodeGenerator::cgCallHelper(Asm& a,
TCA addr,
SSATmp* dst,
SyncOptions sync,
ArgGroup& args,
DestType destType) {
PhysReg dstReg0 = InvalidReg;
PhysReg dstReg1 = InvalidReg;
if (dst) {
dstReg0 = dst->getReg(0);
dstReg1 = dst->getReg(1);
}
return cgCallHelper(a, Transl::Call(addr), dstReg0, dstReg1, sync, args,
destType);
}
void CodeGenerator::cgCallHelper(Asm& a,
TCA addr,
PhysReg dstReg,
SyncOptions sync,
ArgGroup& args,
DestType destType) {
cgCallHelper(a, Transl::Call(addr), dstReg, InvalidReg, sync, args, destType);
}
void CodeGenerator::cgCallHelper(Asm& a,
const Transl::Call& call,
PhysReg dstReg,
SyncOptions sync,
ArgGroup& args,
DestType destType) {
cgCallHelper(a, call, dstReg, InvalidReg, sync, args, destType);
}
void CodeGenerator::cgCallHelper(Asm& a,
const Transl::Call& call,
PhysReg dstReg0,
PhysReg dstReg1,
SyncOptions sync,
ArgGroup& args,
DestType destType) {
assert(int(args.size()) <= kNumRegisterArgs);
assert(m_curInst->isNative());
// Save the register that are live at the point after this IR instruction.
// However, don't save the destination registers that will be overwritten
// by this call.
RegSet toSave = m_curInst->getLiveRegs() & kCallerSaved;
assert((toSave & RegSet().add(dstReg0).add(dstReg1)).empty());
PhysRegSaverParity<1> regSaver(a, toSave);
// Assign registers to the arguments
for (size_t i = 0; i < args.size(); i++) {
args[i].setDstReg(argNumToRegName[i]);
}
shuffleArgs(a, args);
// do the call; may use a trampoline
m_tx64->emitCall(a, call);
// HHIR:TODO this only does required part of TranslatorX64::recordCallImpl()
// Better to have improved SKTRACE'n by calling recordStubCall,
// recordReentrantCall, or recordReentrantStubCall as appropriate
if (sync != kNoSyncPoint) {
recordSyncPoint(a, sync);
}
// copy the call result to the destination register(s)
if (destType == DestType::TV) {
// rdx contains m_type and m_aux; we need to put just the type in the
// lower bits, so right-shift. rax contains m_data.
if (kTypeShiftBits > 0) a.shrq(kTypeShiftBits, reg::rdx);
shuffle2(a, reg::rax, reg::rdx, dstReg0, dstReg1);
} else if (destType == DestType::SSA) {
// copy the single-register result to dstReg0
assert(dstReg1 == InvalidReg);
if (dstReg0 != InvalidReg) emitMovRegReg(a, reg::rax, dstReg0);
} else {
// void return type, no registers have values
assert(dstReg0 == InvalidReg && dstReg1 == InvalidReg);
}
}
void CodeGenerator::cgMov(IRInstruction* inst) {
assert(!inst->getSrc(0)->hasReg(1)); // TODO: t2082361: handle Gen & Cell
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
auto dstReg = dst->getReg();
if (!src->hasReg(0)) {
assert(src->isConst());
if (src->getType() == Type::Bool) {
emitLoadImm(m_as, (int64_t)src->getValBool(), dstReg);
} else {
emitLoadImm(m_as, src->getValRawInt(), dstReg);
}
} else {
auto srcReg = src->getReg();
emitMovRegReg(m_as, srcReg, dstReg);
}
}
template<class OpInstr, class Oper>
void CodeGenerator::cgUnaryIntOp(SSATmp* dst,
SSATmp* src,
OpInstr instr,
Oper oper) {
if (src->getType() != Type::Int && src->getType() != Type::Bool) {
assert(0); CG_PUNT(UnaryIntOp);
}
auto dstReg = dst->getReg();
auto srcReg = src->getReg();
assert(dstReg != InvalidReg);
auto& a = m_as;
// Integer operations require 64-bit representations
zeroExtendIfBool(a, src);
if (srcReg != InvalidReg) {
emitMovRegReg(a, srcReg, dstReg);
(a.*instr) (dstReg);
} else {
assert(src->isConst());
emitLoadImm(a, oper(src->getValRawInt()), dstReg);
}
}
void CodeGenerator::cgNotWork(SSATmp* dst, SSATmp* src) {
cgUnaryIntOp(dst, src, &Asm::not, [](int64_t i) { return ~i; });
}
void CodeGenerator::cgNegateWork(SSATmp* dst, SSATmp* src) {
cgUnaryIntOp(dst, src, &Asm::neg, [](int64_t i) { return -i; });
}
void CodeGenerator::cgNegate(IRInstruction* inst) {
cgNegateWork(inst->getDst(), inst->getSrc(0));
}
template<class Oper>
void CodeGenerator::cgBinaryIntOp(IRInstruction* inst,
void (Asm::*instrIR)(Immed, Reg64),
void (Asm::*instrRR)(Reg64, Reg64),
Oper oper,
Commutativity commuteFlag) {
const SSATmp* dst = inst->getDst();
const SSATmp* src1 = inst->getSrc(0);
const SSATmp* src2 = inst->getSrc(1);
if (!(src1->isA(Type::Bool) || src1->isA(Type::Int)) ||
!(src2->isA(Type::Bool) || src2->isA(Type::Int))) {
CG_PUNT(cgBinaryIntOp);
}
bool const commutative = commuteFlag == Commutative;
auto const dstReg = dst->getReg();
auto const src1Reg = src1->getReg();
auto const src2Reg = src2->getReg();
auto& a = m_as;
// Extend booleans: integer operations require 64-bit
// representations.
zeroExtendIfBool(m_as, src1);
zeroExtendIfBool(m_as, src2);
// Two registers.
if (src1Reg != InvalidReg && src2Reg != InvalidReg) {
if (dstReg == src1Reg) {
(a.*instrRR) (src2Reg, dstReg);
} else if (dstReg == src2Reg) {
if (commutative) {
(a.*instrRR)(src1Reg, dstReg);
} else {
a. movq (src1Reg, rScratch);
(a.*instrRR)(src2Reg, rScratch);
a. movq (rScratch, dstReg);
}
} else {
emitMovRegReg(a, src1Reg, dstReg);
(a.*instrRR) (src2Reg, dstReg);
}
return;
}
// Two immediates.
if (src1Reg == InvalidReg && src2Reg == InvalidReg) {
assert(src1->isConst() && src2->isConst());
int64_t value = oper(src1->getValRawInt(),
src2->getValRawInt());
emitLoadImm(a, value, dstReg);
return;
}
// One register, and one immediate.
if (commutative) {
int64_t immed = (src2Reg == InvalidReg
? src2 : src1)->getValRawInt();
auto srcReg = src2Reg == InvalidReg ? src1Reg : src2Reg;
if (srcReg == dstReg) {
(a.*instrIR) (immed, dstReg);
} else {
emitLoadImm(a, immed, dstReg);
(a.*instrRR) (srcReg, dstReg);
}
return;
}
// NonCommutative:
if (src1Reg == InvalidReg) {
if (dstReg == src2Reg) {
emitLoadImm(a, src1->getValRawInt(), rScratch);
(a.*instrRR) (src2Reg, rScratch);
a. movq (rScratch, dstReg);
} else {
emitLoadImm(a, src1->getValRawInt(), dstReg);
(a.*instrRR) (src2Reg, dstReg);
}
return;
}
assert(src2Reg == InvalidReg);
emitMovRegReg(a, src1Reg, dstReg);
(a.*instrIR) (src2->getValRawInt(), dstReg);
}
template<class Oper>
void CodeGenerator::cgBinaryOp(IRInstruction* inst,
void (Asm::*instrIR)(Immed, Reg64),
void (Asm::*instrRR)(Reg64, Reg64),
void (Asm::*fpInstr)(RegXMM, RegXMM),
Oper oper,
Commutativity commuteFlag) {
const SSATmp* dst = inst->getDst();
const SSATmp* src1 = inst->getSrc(0);
const SSATmp* src2 = inst->getSrc(1);
if (!(src1->isA(Type::Bool) || src1->isA(Type::Int) || src1->isA(Type::Dbl))
||
!(src2->isA(Type::Bool) || src2->isA(Type::Int) || src2->isA(Type::Dbl)) )
{
CG_PUNT(cgBinaryOp);
}
if (src1->isA(Type::Dbl) || src2->isA(Type::Dbl)) {
prepBinaryXmmOp(m_as, src1, src2);
(m_as.*fpInstr)(xmm1, xmm0);
m_as. mov_xmm_reg64(xmm0, dst->getReg());
return;
}
cgBinaryIntOp(inst, instrIR, instrRR, oper, commuteFlag);
}
bool CodeGenerator::emitIncDecHelper(SSATmp* dst, SSATmp* src1, SSATmp* src2,
void(Asm::*emitFunc)(Reg64)) {
if (src1->getReg() != InvalidReg &&
dst ->getReg() != InvalidReg &&
src1->isA(Type::Int) &&
// src2 == 1:
src2->isConst() && src2->isA(Type::Int) && src2->getValInt() == 1) {
emitMovRegReg(m_as, src1->getReg(), dst->getReg());
(m_as.*emitFunc)(dst->getReg());
return true;
}
return false;
}
/*
* If src2 is 1, this generates dst = src1 + 1 using the "inc" x86 instruction.
* The return value is whether or not the instruction could be generated.
*/
bool CodeGenerator::emitInc(SSATmp* dst, SSATmp* src1, SSATmp* src2) {
return emitIncDecHelper(dst, src1, src2, &Asm::incq);
}
/*
* If src2 is 1, this generates dst = src1 - 1 using the "dec" x86 instruction.
* The return value is whether or not the instruction could be generated.
*/
bool CodeGenerator::emitDec(SSATmp* dst, SSATmp* src1, SSATmp* src2) {
return emitIncDecHelper(dst, src1, src2, &Asm::decq);
}
void CodeGenerator::cgOpAdd(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src1 = inst->getSrc(0);
SSATmp* src2 = inst->getSrc(1);
// Special cases: x = y + 1
if (emitInc(dst, src1, src2) || emitInc(dst, src2, src1)) return;
cgBinaryOp(inst,
&Asm::addq,
&Asm::addq,
&Asm::addsd_xmm_xmm,
std::plus<int64_t>(),
Commutative);
}
void CodeGenerator::cgOpSub(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src1 = inst->getSrc(0);
SSATmp* src2 = inst->getSrc(1);
if (emitDec(dst, src1, src2)) return;
if (src1->isConst() && src1->isA(Type::Int) && src1->getValInt() == 0 &&
!src2->isA(Type::Dbl)) {
return cgNegateWork(dst, src2);
}
cgBinaryOp(inst,
&Asm::subq,
&Asm::subq,
&Asm::subsd_xmm_xmm,
std::minus<int64_t>(),
NonCommutative);
}
void CodeGenerator::cgOpAnd(IRInstruction* inst) {
cgBinaryIntOp(inst,
&Asm::andq,
&Asm::andq,
[] (int64_t a, int64_t b) { return a & b; },
Commutative);
}
void CodeGenerator::cgOpOr(IRInstruction* inst) {
cgBinaryIntOp(inst,
&Asm::orq,
&Asm::orq,
[] (int64_t a, int64_t b) { return a | b; },
Commutative);
}
void CodeGenerator::cgOpXor(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src1 = inst->getSrc(0);
SSATmp* src2 = inst->getSrc(1);
if (src2->isConst() && src2->getType() == Type::Int &&
src2->getValInt() == ~0L) {
return cgNotWork(dst, src1);
}
cgBinaryIntOp(inst,
&Asm::xorq,
&Asm::xorq,
[] (int64_t a, int64_t b) { return a ^ b; },
Commutative);
}
void CodeGenerator::cgOpMul(IRInstruction* inst) {
cgBinaryOp(inst,
&Asm::imul,
&Asm::imul,
&Asm::mulsd_xmm_xmm,
std::multiplies<int64_t>(),
Commutative);
}
// Runtime helpers
HOT_FUNC_VM static int64_t arrToBoolHelper(const ArrayData *a) {
return a->size() != 0;
}
HOT_FUNC_VM static int64_t cellToBoolHelper(TypedValue tv) {
if (IS_NULL_TYPE(tv.m_type)) {
return 0;
}
if (tv.m_type <= KindOfInt64) {
return tv.m_data.num ? 1 : 0;
}
switch (tv.m_type) {
case KindOfDouble: return tv.m_data.dbl != 0;
case KindOfStaticString:
case KindOfString: return tv.m_data.pstr->toBoolean();
case KindOfArray: return tv.m_data.parr->size() != 0;
case KindOfObject: return tv.m_data.pobj->o_toBoolean();
default:
assert(false);
break;
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// Comparison Operators
///////////////////////////////////////////////////////////////////////////////
#define DISPATCHER(name) \
HOT_FUNC_VM int64_t ccmp_ ## name (StringData* a1, StringData* a2) \
{ return name(a1, a2); } \
HOT_FUNC_VM int64_t ccmp_ ## name (StringData* a1, int64_t a2) \
{ return name(a1, a2); } \
HOT_FUNC_VM int64_t ccmp_ ## name (StringData* a1, ObjectData* a2) \
{ return name(a1, Object(a2)); } \
HOT_FUNC_VM int64_t ccmp_ ## name (ObjectData* a1, ObjectData* a2) \
{ return name(Object(a1), Object(a2)); } \
HOT_FUNC_VM int64_t ccmp_ ## name (ObjectData* a1, int64_t a2) \
{ return name(Object(a1), a2); } \
HOT_FUNC_VM int64_t ccmp_ ## name (ArrayData* a1, ArrayData* a2) \
{ return name(Array(a1), Array(a2)); }
DISPATCHER(same)
DISPATCHER(equal)
DISPATCHER(more)
DISPATCHER(less)
#undef DISPATCHER
template <typename A, typename B>
inline int64_t ccmp_nsame(A a, B b) { return !ccmp_same(a, b); }
template <typename A, typename B>
inline int64_t ccmp_nequal(A a, B b) { return !ccmp_equal(a, b); }
template <typename A, typename B>
inline int64_t ccmp_lte(A a, B b) { return !ccmp_more(a, b); }
template <typename A, typename B>
inline int64_t ccmp_gte(A a, B b) { return !ccmp_less(a, b); }
#define CG_OP_CMP(inst, setter, name) \
cgOpCmpHelper(inst, &Asm:: setter, ccmp_ ## name, ccmp_ ## name, \
ccmp_ ## name, ccmp_ ## name, ccmp_ ## name, ccmp_ ## name)
// SRON - string, resource, object, or number
static bool typeIsSRON(Type t) {
return t.isString()
|| t == Type::Obj // encompases object and resource
|| t == Type::Int
|| t == Type::Dbl
;
}
void CodeGenerator::cgOpCmpHelper(
IRInstruction* inst,
void (Asm::*setter)(Reg8),
int64_t (*str_cmp_str)(StringData*, StringData*),
int64_t (*str_cmp_int)(StringData*, int64_t),
int64_t (*str_cmp_obj)(StringData*, ObjectData*),
int64_t (*obj_cmp_obj)(ObjectData*, ObjectData*),
int64_t (*obj_cmp_int)(ObjectData*, int64_t),
int64_t (*arr_cmp_arr)( ArrayData*, ArrayData*)
) {
SSATmp* dst = inst->getDst();
SSATmp* src1 = inst->getSrc(0);
SSATmp* src2 = inst->getSrc(1);
Type type1 = src1->getType();
Type type2 = src2->getType();
auto src1Reg = src1->getReg();
auto src2Reg = src2->getReg();
auto dstReg = dst ->getReg();
auto setFromFlags = [&] {
(m_as.*setter)(rbyte(dstReg));
};
// It is possible that some pass has been done after simplification; if such
// a pass invalidates our invariants, then just punt.
// simplifyCmp has done const-const optimization
//
// If the types are the same and there is only one constant,
// simplifyCmp has moved it to the right.
if (src1->isConst()) {
CG_PUNT(cgOpCmpHelper_const);
}
/////////////////////////////////////////////////////////////////////////////
// case 1: null/string cmp string
// simplifyCmp has converted the null to ""
if (type1.isString() && type2.isString()) {
ArgGroup args;
args.ssa(src1).ssa(src2);
cgCallHelper(m_as, (TCA)str_cmp_str, dst, kSyncPoint, args);
}
/////////////////////////////////////////////////////////////////////////////
// case 2: bool/null cmp anything
// simplifyCmp has converted all args to bool
else if (type1 == Type::Bool && type2 == Type::Bool) {
if (src2->isConst()) {
m_as. cmpb (src2->getValBool(), Reg8(int(src1Reg)));
} else {
m_as. cmpb (Reg8(int(src2Reg)), Reg8(int(src1Reg)));
}
setFromFlags();
}
/////////////////////////////////////////////////////////////////////////////
// case 3, 4, and 7: string/resource/object/number (sron) cmp sron
// These cases must be amalgamated because Type::Obj can refer to an object
// or to a resource.
// strings are canonicalized to the left, ints to the right
else if (typeIsSRON(type1) && typeIsSRON(type2)) {
// the common case: int cmp int
if (type1 == Type::Int && type2 == Type::Int) {
if (src2->isConst()) {
m_as.cmp_imm64_reg64(src2->getValInt(), src1Reg);
} else {
m_as.cmp_reg64_reg64(src2Reg, src1Reg);
}
setFromFlags();
}
else if (type1 == Type::Dbl || type2 == Type::Dbl) {
if ((type1 == Type::Dbl || type1 == Type::Int) &&
(type2 == Type::Dbl || type2 == Type::Int)) {
prepBinaryXmmOp(m_as, src1, src2);
doubleCmp(m_as, xmm0, xmm1);
setFromFlags();
} else {
CG_PUNT(cgOpCmpHelper_Dbl);
}
}
else if (type1.isString()) {
// string cmp string is dealt with in case 1
// string cmp double is punted above
if (type2 == Type::Int) {
ArgGroup args;
args.ssa(src1).ssa(src2);
cgCallHelper(m_as, (TCA)str_cmp_int, dst, kSyncPoint, args);
} else if (type2 == Type::Obj) {
ArgGroup args;
args.ssa(src1).ssa(src2);
cgCallHelper(m_as, (TCA)str_cmp_obj, dst, kSyncPoint, args);
} else {
CG_PUNT(cgOpCmpHelper_sx);
}
}
else if (type1 == Type::Obj) {
// string cmp object/resource is dealt with above
// object cmp double is punted above
if (type2 == Type::Obj) {
ArgGroup args;
args.ssa(src1).ssa(src2);
cgCallHelper(m_as, (TCA)obj_cmp_obj, dst, kSyncPoint, args);
} else if (type2 == Type::Int) {
ArgGroup args;
args.ssa(src1).ssa(src2);
cgCallHelper(m_as, (TCA)obj_cmp_int, dst, kSyncPoint, args);
} else {
CG_PUNT(cgOpCmpHelper_ox);
}
}
else NOT_REACHED();
}
/////////////////////////////////////////////////////////////////////////////
// case 5: array cmp array
else if (type1.isArray() && type2.isArray()) {
ArgGroup args;
args.ssa(src1).ssa(src2);
cgCallHelper(m_as, (TCA)arr_cmp_arr, dst, kSyncPoint, args);
}
/////////////////////////////////////////////////////////////////////////////
// case 6: array cmp anything
// simplifyCmp has already dealt with this case.
/////////////////////////////////////////////////////////////////////////////
else {
// We have a type which is not a common type. It might be a cell or a box.
CG_PUNT(cgOpCmpHelper_unimplemented);
}
}
void CodeGenerator::cgOpEq(IRInstruction* inst) {
CG_OP_CMP(inst, sete, equal);
}
void CodeGenerator::cgOpNeq(IRInstruction* inst) {
CG_OP_CMP(inst, setne, nequal);
}
void CodeGenerator::cgOpSame(IRInstruction* inst) {
CG_OP_CMP(inst, sete, same);
}
void CodeGenerator::cgOpNSame(IRInstruction* inst) {
CG_OP_CMP(inst, setne, nsame);
}
void CodeGenerator::cgOpLt(IRInstruction* inst) {
CG_OP_CMP(inst, setl, less);
}
void CodeGenerator::cgOpGt(IRInstruction* inst) {
CG_OP_CMP(inst, setg, more);
}
void CodeGenerator::cgOpLte(IRInstruction* inst) {
CG_OP_CMP(inst, setle, lte);
}
void CodeGenerator::cgOpGte(IRInstruction* inst) {
CG_OP_CMP(inst, setge, gte);
}
///////////////////////////////////////////////////////////////////////////////
// Type check operators
///////////////////////////////////////////////////////////////////////////////
template<class OpndType>
ConditionCode CodeGenerator::emitTypeTest(Type type, OpndType src,
bool negate) {
ConditionCode cc;
assert(!type.subtypeOf(Type::Cls));
if (type.isString()) {
emitTestTVType(m_as, KindOfStringBit, src);
cc = CC_NZ;
} else if (type.equals(Type::UncountedInit)) {
emitTestTVType(m_as, KindOfUncountedInitBit, src);
cc = CC_NZ;
} else if (type.equals(Type::Uncounted)) {
emitCmpTVType(m_as, KindOfRefCountThreshold, src);
cc = CC_LE;
} else if (type.equals(Type::Cell)) {
emitCmpTVType(m_as, KindOfRef, src);
cc = CC_L;
} else if (type.equals(Type::Gen)) {
return CC_None; // nothing to check
} else {
DataType dataType = type.toDataType();
assert(dataType == KindOfRef ||
(dataType >= KindOfUninit && dataType <= KindOfObject));
emitCmpTVType(m_as, dataType, src);
cc = CC_E;
}
return negate ? ccNegate(cc) : cc;
}
template<class OpndType>
ConditionCode CodeGenerator::emitTypeTest(IRInstruction* inst, OpndType src,
bool negate) {
return emitTypeTest(inst->getTypeParam(), src, negate);
}
void CodeGenerator::emitSetCc(IRInstruction* inst, ConditionCode cc) {
if (cc == CC_None) return;
m_as.setcc(cc, rbyte(inst->getDst()->getReg()));
}
ConditionCode CodeGenerator::emitIsTypeTest(IRInstruction* inst, bool negate) {
if (inst->getTypeParam().subtypeOf(Type::Obj)) {
// Task #2094715: Handle isType tests for Type::Obj, which
// requires checking that checked object is not a resource
CG_PUNT(cgIsTypeObject);
}
SSATmp* src = inst->getSrc(0);
if (src->isA(Type::PtrToGen)) {
PhysReg base = src->getReg();
return emitTypeTest(inst, base[TVOFF(m_type)], negate);
}
assert(src->isA(Type::Gen));
assert(!src->isConst());
PhysReg srcReg = src->getReg(1); // type register
return emitTypeTest(inst, r32(srcReg), negate);
}
template<class OpndType>
void CodeGenerator::emitGuardType(OpndType src, IRInstruction* inst) {
emitGuardOrFwdJcc(inst, emitTypeTest(inst, src, true));
}
void CodeGenerator::cgGuardTypeCell(PhysReg baseReg,
int64_t offset,
IRInstruction* inst) {
emitGuardType(baseReg[offset + TVOFF(m_type)], inst);
}
void CodeGenerator::cgIsTypeMemCommon(IRInstruction* inst, bool negate) {
emitSetCc(inst, emitIsTypeTest(inst, negate));
}
void CodeGenerator::cgIsTypeCommon(IRInstruction* inst, bool negate) {
emitSetCc(inst, emitIsTypeTest(inst, negate));
}
void CodeGenerator::cgJmpIsTypeCommon(IRInstruction* inst, bool negate) {
emitJccDirectExit(inst, emitIsTypeTest(inst, negate));
}
void CodeGenerator::cgIsType(IRInstruction* inst) {
cgIsTypeCommon(inst, false);
}
void CodeGenerator::cgIsNType(IRInstruction* inst) {
cgIsTypeCommon(inst, true);
}
void CodeGenerator::cgJmpIsType(IRInstruction* inst) {
cgJmpIsTypeCommon(inst, false);
}
void CodeGenerator::cgJmpIsNType(IRInstruction* inst) {
cgJmpIsTypeCommon(inst, true);
}
void CodeGenerator::cgIsTypeMem(IRInstruction* inst) {
cgIsTypeMemCommon(inst, false);
}
void CodeGenerator::cgIsNTypeMem(IRInstruction* inst) {
cgIsTypeMemCommon(inst, true);
}
///////////////////////////////////////////////////////////////////////////////
HOT_FUNC_VM static bool instanceOfHelper(const Class* objClass,
const Class* testClass) {
return testClass && objClass->classof(testClass);
}
HOT_FUNC_VM static bool instanceOfHelperIFace(const Class* objClass,
const Class* testClass) {
return testClass && objClass->classof(testClass->preClass());
}
void CodeGenerator::emitInstanceCheck(IRInstruction* inst, PhysReg dstReg) {
const bool ifaceHint = inst->getSrc(2)->getValBool();
cgCallHelper(m_as,
TCA(ifaceHint ? instanceOfHelperIFace : instanceOfHelper),
dstReg,
kNoSyncPoint,
ArgGroup()
.ssa(inst->getSrc(0))
.ssa(inst->getSrc(1)));
}
void CodeGenerator::cgInstanceOf(IRInstruction* inst) {
emitInstanceCheck(inst, inst->getDst()->getReg());
}
void CodeGenerator::cgNInstanceOf(IRInstruction* inst) {
// TODO(#2058865): having NInstanceOf is no better than InstanceOf
// followed by boolean Not opcode.
PhysReg dstReg = inst->getDst()->getReg();
emitInstanceCheck(inst, dstReg);
Reg8 dr((int(dstReg)));
auto& a = m_as;
a. testb (dr, dr);
a. setz (dr);
}
void CodeGenerator::cgJmpInstanceOf(IRInstruction* inst) {
auto& a = m_as;
emitInstanceCheck(inst, rax);
a. testb (al, al);
emitJccDirectExit(inst, CC_NZ);
}
void CodeGenerator::cgJmpNInstanceOf(IRInstruction* inst) {
auto& a = m_as;
emitInstanceCheck(inst, rax);
a. testb (al, al);
emitJccDirectExit(inst, CC_Z);
}
/*
* Check instanceof using instance bitmasks.
*
* Note it's not necessary to check whether the test class is defined:
* if it doesn't exist than the candidate can't be an instance of it
* and will fail this check.
*/
void CodeGenerator::emitInstanceBitmaskCheck(IRInstruction* inst) {
auto const rObjClass = inst->getSrc(0)->getReg(0);
auto const testClassName = inst->getSrc(1)->getValStr();
auto& a = m_as;
int offset;
uint8_t mask;
if (!Class::getInstanceBitMask(testClassName, offset, mask)) {
always_assert(!"cgInstanceOfBitmask had no bitmask");
}
a. testb (int8_t(mask), rObjClass[offset]);
}
void CodeGenerator::cgInstanceOfBitmask(IRInstruction* inst) {
auto& a = m_as;
emitInstanceBitmaskCheck(inst);
a. setnz (rbyte(inst->getDst()->getReg()));
}
void CodeGenerator::cgNInstanceOfBitmask(IRInstruction* inst) {
auto& a = m_as;
emitInstanceBitmaskCheck(inst);
a. setz (rbyte(inst->getDst()->getReg()));
}
void CodeGenerator::cgJmpInstanceOfBitmask(IRInstruction* inst) {
emitInstanceBitmaskCheck(inst);
emitJccDirectExit(inst, CC_NZ);
}
void CodeGenerator::cgJmpNInstanceOfBitmask(IRInstruction* inst) {
emitInstanceBitmaskCheck(inst);
emitJccDirectExit(inst, CC_Z);
}
/*
* Check instanceof using the superclass vector on the end of the
* Class entry.
*/
void CodeGenerator::cgExtendsClass(IRInstruction* inst) {
auto const rObjClass = inst->getSrc(0)->getReg();
auto const testClass = inst->getSrc(1)->getValClass();
auto rTestClass = inst->getSrc(1)->getReg();
auto const rdst = rbyte(inst->getDst()->getReg());
auto& a = m_as;
Label out;
Label notExact;
Label falseLabel;
if (rTestClass == InvalidReg) { // TODO(#2031606)
rTestClass = rScratch; // careful below about asm-x64 smashing this
emitLoadImm(a, (int64_t)testClass, rTestClass);
}
// Test if it is the exact same class. TODO(#2044801): we should be
// doing this control flow at the IR level.
if (!(testClass->attrs() & AttrAbstract)) {
if (Class::alwaysLowMem()) {
a. cmpl (r32(rTestClass), r32(rObjClass));
} else {
a. cmpq (rTestClass, rObjClass);
}
a. jne8 (notExact);
a. movb (1, rdst);
a. jmp8 (out);
}
auto const vecOffset = Class::classVecOff() +
sizeof(Class*) * (testClass->classVecLen() - 1);
// Check the length of the class vectors---if the candidate's is at
// least as long as the potential base (testClass) it might be a
// subclass.
asm_label(a, notExact);
a. cmpl (testClass->classVecLen(),
rObjClass[Class::classVecLenOff()]);
a. jb8 (falseLabel);
// If it's a subclass, rTestClass must be at the appropriate index.
if (Class::alwaysLowMem()) {
a. cmpl (r32(rTestClass), rObjClass[vecOffset]);
} else {
a. cmpq (rTestClass, rObjClass[vecOffset]);
}
a. sete (rdst);
a. jmp8 (out);
asm_label(a, falseLabel);
a. xorl (r32(rdst), r32(rdst));
asm_label(a, out);
}
ArrayData* new_singleton_array_helper(TypedValue value) {
tvCastToArrayInPlace(&value);
return value.m_data.parr;
}
void CodeGenerator::cgConvToArr(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
ArgGroup args;
args.typedValue(src);
ArrayData*(*fPtr)(TypedValue) = new_singleton_array_helper;
cgCallHelper(m_as, (TCA)fPtr, dst, kNoSyncPoint, args);
}
void CodeGenerator::cgConvToBool(IRInstruction* inst) {
Type fromType = inst->getSrc(0)->getType();
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
auto dstReg = dst->getReg();
auto srcReg = src->getReg();
bool srcIsConst = src->isConst();
if (fromType.isNull()) {
// Uninit/Null -> Bool (false)
m_as.xor_reg64_reg64(dstReg, dstReg);
} else if (fromType == Type::Bool) {
// Bool -> Bool (nop!)
if (srcIsConst) {
int64_t constVal = src->getValRawInt();
if (constVal == 0) {
m_as.xor_reg64_reg64(dstReg, dstReg);
} else {
m_as.mov_imm64_reg(1, dstReg);
}
} else {
emitMovRegReg(m_as, srcReg, dstReg);
}
} else if (fromType == Type::Int) {
// Int -> Bool
if (srcIsConst) {
int64_t constVal = src->getValInt();
if (constVal == 0) {
m_as.xor_reg64_reg64(dstReg, dstReg);
} else {
m_as.mov_imm64_reg(1, dstReg);
}
} else {
m_as.test_reg64_reg64(srcReg, srcReg);
m_as.setne(rbyte(dstReg));
}
} else {
Transl::Call helper(nullptr);
ArgGroup args;
if (fromType == Type::Cell) {
// Cell -> Bool
args.typedValue(src);
helper = Transl::Call((TCA)cellToBoolHelper);
} else if (fromType.isString()) {
// Str -> Bool
args.ssa(src);
helper = Transl::Call(getMethodPtr(&StringData::toBoolean));
} else if (fromType.isArray()) {
// Arr -> Bool
args.ssa(src);
helper = Transl::Call((TCA)arrToBoolHelper);
} else if (fromType == Type::Obj) {
// Obj -> Bool
args.ssa(src);
helper = Transl::Call(getMethodPtr(&ObjectData::o_toBoolean));
} else {
// Dbl -> Bool
CG_PUNT(Conv_Dbl_Bool);
}
cgCallHelper(m_as, helper, dstReg, kNoSyncPoint, args);
}
}
void CodeGenerator::cgConvToDbl(IRInstruction* inst) {
CG_PUNT(ConvToDbl);
}
void CodeGenerator::cgConvToInt(IRInstruction* inst) {
Type fromType = inst->getSrc(0)->getType();
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
auto dstReg = dst->getReg();
auto srcReg = src->getReg();
bool srcIsConst = src->isConst();
if (fromType == Type::Bool) {
// Bool -> Int is just a move
if (srcIsConst) {
int64_t constVal = src->getValRawInt();
if (constVal == 0) {
m_as.xor_reg64_reg64(dstReg, dstReg);
} else {
m_as.mov_imm64_reg(1, dstReg);
}
} else {
m_as.movzbl (rbyte(srcReg), r32(dstReg));
}
return;
}
if (fromType.isString()) {
if (srcIsConst) {
auto val = src->getValStr()->toInt64();
m_as.mov_imm64_reg(val, dstReg);
} else {
ArgGroup args;
args.ssa(src).imm(10);
cgCallHelper(m_as,
Transl::Call(getMethodPtr(&StringData::toInt64)),
dstReg, kNoSyncPoint, args);
}
return;
}
CG_PUNT(Conv);
}
void CodeGenerator::cgConvToObj(IRInstruction* inst) {
CG_PUNT(ConvToObj);
}
void CodeGenerator::cgConvToStr(IRInstruction* inst) {
Type fromType = inst->getSrc(0)->getType();
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
auto dstReg = dst->getReg();
auto srcReg = src->getReg();
if (fromType == Type::Int) {
// Int -> Str
ArgGroup args;
args.ssa(src);
StringData*(*fPtr)(int64_t) = buildStringData;
cgCallHelper(m_as, (TCA)fPtr,
dst, kNoSyncPoint, args);
} else if (fromType == Type::Bool) {
// Bool -> Str
m_as.testb(Reg8(int(srcReg)), Reg8(int(srcReg)));
m_as.mov_imm64_reg((uint64_t)StringData::GetStaticString(""),
dstReg);
m_as.mov_imm64_reg((uint64_t)StringData::GetStaticString("1"),
rScratch);
m_as.cmov_reg64_reg64(CC_NZ, rScratch, dstReg);
} else {
CG_PUNT(ConvToString);
}
}
void CodeGenerator::cgUnboxPtr(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
auto srcReg = src->getReg();
auto dstReg = dst->getReg();
assert(srcReg != InvalidReg);
assert(dstReg != InvalidReg);
emitMovRegReg(m_as, srcReg, dstReg);
emitDerefIfVariant(m_as, PhysReg(dstReg));
}
void CodeGenerator::cgUnbox(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
auto dstValReg = dst->getReg(0);
auto dstTypeReg = dst->getReg(1);
auto srcValReg = src->getReg(0);
auto srcTypeReg = src->getReg(1);
assert(src->getType().equals(Type::Gen));
assert(dst->getType().notBoxed());
// cmpq KindOfRef, srcTypeReg
// mov srcTypeReg --> dstTypeReg
//
// -- srcTypeReg is now dead
// -- if srcValReg == dstTypeReg, then use scratch for dstTypeReg; otherwise,
// -- the next load will kill srcValReg
//
// cload.z [srcValReg + m_type] --> dstTypeReg
// mov srcValReg --> dstValReg (potentially move up 1 instruction)
// cload.z [srcValReg + m_data] --> dstValReg
PhysReg tmpDstTypeReg = srcValReg == dstTypeReg ? PhysReg(rScratch)
: dstTypeReg;
bool useCMov = sizeof(DataType) == 4;
emitMovRegReg(m_as, srcTypeReg, tmpDstTypeReg);
emitMovRegReg(m_as, srcValReg, dstValReg);
emitCmpTVType(m_as, HPHP::KindOfRef, srcTypeReg);
// XXX: hardcodes RefData <-> TypedValue pun.
if (useCMov) {
m_as. cload_reg64_disp_reg32(CC_Z, srcValReg, TVOFF(m_type), tmpDstTypeReg);
m_as. cload_reg64_disp_reg64(CC_Z, srcValReg, TVOFF(m_data), dstValReg);
} else {
ifThen(m_as, CC_E, [&]() {
emitLoadTVType(m_as, srcValReg[TVOFF(m_type)], tmpDstTypeReg);
m_as.loadq(srcValReg[TVOFF(m_data)], dstValReg);
});
}
emitMovRegReg(m_as, tmpDstTypeReg, dstTypeReg);
}
void CodeGenerator::cgLdFixedFunc(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* methodName = inst->getSrc(0);
using namespace TargetCache;
const StringData* name = methodName->getValStr();
CacheHandle ch = allocFixedFunction(name);
size_t funcCacheOff = ch + offsetof(FixedFuncCache, m_func);
auto dstReg = dst->getReg();
if (dstReg == InvalidReg) {
// happens if LdFixedFunc and FCall not in same trace
m_as. cmpq(0, rVmTl[funcCacheOff]);
} else {
m_as. loadq (rVmTl[funcCacheOff], dstReg);
m_as. testq (dstReg, dstReg);
}
// jz off to the helper call in astubs
unlikelyIfBlock(CC_Z, [&] {
// this helper tries the autoload map, and fatals on failure
cgCallHelper(m_astubs, (TCA)FixedFuncCache::lookupUnknownFunc,
dstReg, kSyncPoint, ArgGroup().immPtr(name));
});
}
void CodeGenerator::cgLdFunc(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* methodName = inst->getSrc(0);
TargetCache::CacheHandle ch = TargetCache::FuncCache::alloc();
// raises an error if function not found
cgCallHelper(m_as, (TCA)FuncCache::lookup, dst->getReg(), kSyncPoint,
ArgGroup().imm(ch).ssa(methodName));
}
static void emitLdObjClass(CodeGenerator::Asm& a,
PhysReg objReg,
PhysReg dstReg) {
a.loadq (objReg[ObjectData::getVMClassOffset()], dstReg);
}
void CodeGenerator::cgLdObjClass(IRInstruction* inst) {
auto dstReg = inst->getDst()->getReg();
auto objReg = inst->getSrc(0)->getReg();
emitLdObjClass(m_as, objReg, dstReg);
}
void CodeGenerator::cgLdObjMethod(IRInstruction *inst) {
auto cls = inst->getSrc(0);
auto clsReg = cls->getReg();
auto name = inst->getSrc(1);
auto actRec = inst->getSrc(2);
auto actRecReg = actRec->getReg();
CacheHandle handle = Transl::TargetCache::MethodCache::alloc();
// lookup in the targetcache
assert(MethodCache::kNumLines == 1);
if (debug) {
MethodCache::Pair p;
static_assert(sizeof(p.m_value) == 8,
"MethodCache::Pair::m_value assumed to be 8 bytes");
static_assert(sizeof(p.m_key) == 8,
"MethodCache::Pair::m_key assumed to be 8 bytes");
}
// preload handle->m_value
m_as.loadq(rVmTl[handle + offsetof(MethodCache::Pair, m_value)], rScratch);
m_as.cmpq (rVmTl[handle + offsetof(MethodCache::Pair, m_key)], clsReg);
ifThenElse(CC_E, // if handle->key == cls
[&] { // then actReg->m_func = handle->value
m_as.storeq(rScratch, actRecReg[AROFF(m_func)]);
},
[&] { // else call slow path helper
cgCallHelper(m_as, (TCA)methodCacheSlowPath, InvalidReg,
kSyncPoint,
ArgGroup().addr(rVmTl, handle)
.ssa(actRec)
.ssa(name)
.ssa(cls));
});
}
void CodeGenerator::cgRetVal(IRInstruction* inst) {
auto const rFp = inst->getSrc(0)->getReg();
auto* const val = inst->getSrc(1);
auto& a = m_as;
// Store return value at the top of the caller's eval stack
// (a) Store the type
if (val->getType().needsReg()) {
emitStoreTVType(a, val->getReg(1), rFp[AROFF(m_r) + TVOFF(m_type)]);
} else {
emitStoreTVType(a, val->getType().toDataType(),
rFp[AROFF(m_r) + TVOFF(m_type)]);
}
// (b) Store the actual value (not necessary when storing Null)
if (val->getType().isNull()) return;
if (val->getInstruction()->getOpcode() == DefConst) {
a. storeq (val->getValRawInt(),
rFp[AROFF(m_r) + TVOFF(m_data)]);
} else {
zeroExtendIfBool(m_as, val);
a. storeq (val->getReg(), rFp[AROFF(m_r) + TVOFF(m_data)]);
}
}
void CodeGenerator::cgRetAdjustStack(IRInstruction* inst) {
auto const rFp = inst->getSrc(0)->getReg();
auto const dstSp = inst->getDst()->getReg();
auto& a = m_as;
a. lea (rFp[AROFF(m_r)], dstSp);
}
void CodeGenerator::cgLdRetAddr(IRInstruction* inst) {
auto fpReg = inst->getSrc(0)->getReg(0);
assert(fpReg != InvalidReg);
m_as.push(fpReg[AROFF(m_savedRip)]);
}
void checkFrame(ActRec* fp, Cell* sp, bool checkLocals) {
const Func* func = fp->m_func;
if (fp->hasVarEnv()) {
assert(fp->getVarEnv()->getCfp() == fp);
}
// TODO: validate this pointer from actrec
int numLocals = func->numLocals();
DEBUG_ONLY Cell* firstSp = ((Cell*)fp) - func->numSlotsInFrame();
assert(sp <= firstSp || func->isGenerator());
if (checkLocals) {
int numParams = func->numParams();
for (int i=0; i < numLocals; i++) {
if (i >= numParams && func->isGenerator() && i < func->numNamedLocals()) {
continue;
}
assert(checkTv(frame_local(fp, i)));
}
}
// We unfortunately can't do the same kind of check for the stack
// because it may contain ActRecs.
#if 0
for (Cell* c=sp; c < firstSp; c++) {
TypedValue* tv = (TypedValue*)c;
assert(tvIsPlausible(tv));
DataType t = tv->m_type;
if (IS_REFCOUNTED_TYPE(t)) {
assert(tv->m_data.pstr->getCount() > 0);
}
}
#endif
}
void traceRet(ActRec* fp, Cell* sp, void* rip) {
if (rip == TranslatorX64::Get()->getCallToExit()) {
return;
}
checkFrame(fp, sp, false);
assertTv(sp); // check return value
}
void CodeGenerator::emitTraceRet(CodeGenerator::Asm& a) {
// call to a trace function
// ld return ip from native stack into rdx
a. loadq (*rsp, rdx);
a. movq (rVmFp, rdi);
a. movq (rVmSp, rsi);
// do the call; may use a trampoline
m_tx64->emitCall(a, TCA(traceRet));
}
void CodeGenerator::cgRetCtrl(IRInstruction* inst) {
SSATmp* sp = inst->getSrc(0);
SSATmp* fp = inst->getSrc(1);
// Make sure rVmFp and rVmSp are set appropriately
emitMovRegReg(m_as, sp->getReg(), rVmSp);
emitMovRegReg(m_as, fp->getReg(), rVmFp);
// Return control to caller
if (RuntimeOption::EvalHHIRGenerateAsserts) {
emitTraceRet(m_as);
}
m_as.ret();
if (RuntimeOption::EvalHHIRGenerateAsserts) {
m_as.ud2();
}
}
void CodeGenerator::emitReqBindAddr(const Func* func,
TCA& dest,
Offset offset) {
dest = m_tx64->emitServiceReq(TranslatorX64::SRFlags::SRNone,
REQ_BIND_ADDR,
2ull,
&dest,
offset);
}
void CodeGenerator::cgJmpSwitchDest(IRInstruction* inst) {
JmpSwitchData* data = inst->getExtra<JmpSwitchDest>();
SSATmp* index = inst->getSrc(0);
auto indexReg = index->getReg();
if (!index->isConst()) {
if (data->bounded) {
if (data->base) {
m_as. subq(data->base, indexReg);
}
m_as. cmpq(data->cases - 2, indexReg);
m_tx64->prepareForSmash(m_as, TranslatorX64::kJmpccLen);
TCA def = m_tx64->emitServiceReq(REQ_BIND_JMPCC_SECOND, 3,
m_as.code.frontier, data->defaultOff, CC_AE);
m_as. jae(def);
}
TCA* table = m_tx64->m_globalData.alloc<TCA>(sizeof(TCA), data->cases);
TCA afterLea = m_as.code.frontier + TranslatorX64::kLeaRipLen;
ptrdiff_t diff = (TCA)table - afterLea;
assert(deltaFits(diff, sz::dword));
m_as. lea(rip[diff], rScratch);
assert(m_as.code.frontier == afterLea);
m_as. jmp(rScratch[indexReg*8]);
for (int i = 0; i < data->cases; i++) {
emitReqBindAddr(data->func, table[i], data->targets[i]);
}
} else {
int64_t indexVal = index->getValInt();
if (data->bounded) {
indexVal -= data->base;
if (indexVal >= data->cases - 2 || indexVal < 0) {
m_tx64->emitBindJmp(m_as, SrcKey(data->func, data->defaultOff));
return;
}
}
m_tx64->emitBindJmp(m_as, SrcKey(data->func, data->targets[indexVal]));
}
}
typedef FixedStringMap<TCA,true> SSwitchMap;
static TCA sswitchHelperFast(const StringData* val,
const SSwitchMap* table,
TCA* def) {
TCA* dest = table->find(val);
return dest ? *dest : *def;
}
void CodeGenerator::cgLdSSwitchDestFast(IRInstruction* inst) {
auto data = inst->getExtra<LdSSwitchDestFast>();
auto table = m_tx64->m_globalData.alloc<SSwitchMap>(64);
table->init(data->numCases);
for (int64_t i = 0; i < data->numCases; ++i) {
table->add(data->cases[i].str, nullptr);
TCA* addr = table->find(data->cases[i].str);
emitReqBindAddr(data->func, *addr, data->cases[i].dest);
}
TCA* def = m_tx64->m_globalData.alloc<TCA>(sizeof(TCA), 1);
emitReqBindAddr(data->func, *def, data->defaultOff);
cgCallHelper(m_as,
TCA(sswitchHelperFast),
inst->getDst(),
kNoSyncPoint,
ArgGroup()
.ssa(inst->getSrc(0))
.immPtr(table)
.immPtr(def));
}
static TCA sswitchHelperSlow(TypedValue typedVal,
const StringData** strs,
int numStrs,
TCA* jmptab) {
TypedValue* cell = tvToCell(&typedVal);
for (int i = 0; i < numStrs; ++i) {
if (tvAsCVarRef(cell).equal(strs[i])) return jmptab[i];
}
return jmptab[numStrs]; // default case
}
void CodeGenerator::cgLdSSwitchDestSlow(IRInstruction* inst) {
auto data = inst->getExtra<LdSSwitchDestSlow>();
auto strtab = m_tx64->m_globalData.alloc<const StringData*>(
sizeof(const StringData*), data->numCases);
auto jmptab = m_tx64->m_globalData.alloc<TCA>(sizeof(TCA),
data->numCases + 1);
for (int i = 0; i < data->numCases; ++i) {
strtab[i] = data->cases[i].str;
emitReqBindAddr(data->func, jmptab[i], data->cases[i].dest);
}
emitReqBindAddr(data->func, jmptab[data->numCases], data->defaultOff);
cgCallHelper(m_as,
TCA(sswitchHelperSlow),
inst->getDst(),
kSyncPoint,
ArgGroup()
.typedValue(inst->getSrc(0))
.immPtr(strtab)
.imm(data->numCases)
.immPtr(jmptab));
}
void CodeGenerator::cgFreeActRec(IRInstruction* inst) {
SSATmp* outFp = inst->getDst();
SSATmp* inFp = inst->getSrc(0);
auto inFpReg = inFp->getReg();
auto outFpReg = outFp->getReg();
m_as.load_reg64_disp_reg64(inFpReg, AROFF(m_savedRbp), outFpReg);
}
void CodeGenerator::cgAllocSpill(IRInstruction* inst) {
SSATmp* numSlots = inst->getSrc(0);
assert(numSlots->isConst());
int64_t n = numSlots->getValInt();
assert(n >= 0 && n % 2 == 0);
if (n > 0) {
m_as.sub_imm32_reg64(spillSlotsToSize(n), reg::rsp);
}
}
void CodeGenerator::cgFreeSpill(IRInstruction* inst) {
SSATmp* numSlots = inst->getSrc(0);
assert(numSlots->isConst());
int64_t n = numSlots->getValInt();
assert(n >= 0 && n % 2 == 0);
if (n > 0) {
m_as.add_imm32_reg64(spillSlotsToSize(n), reg::rsp);
}
}
void CodeGenerator::cgSpill(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
assert(dst->numNeededRegs() == src->numNeededRegs());
for (int locIndex = 0; locIndex < src->numNeededRegs(); ++locIndex) {
auto srcReg = src->getReg(locIndex);
// We do not need to mask booleans, since the IR will reload the spill
auto sinfo = dst->getSpillInfo(locIndex);
switch (sinfo.type()) {
case SpillInfo::MMX:
m_as. mov_reg64_mmx(srcReg, sinfo.mmx());
break;
case SpillInfo::Memory:
m_as. store_reg64_disp_reg64(srcReg,
sizeof(uint64_t) * sinfo.mem(),
reg::rsp);
break;
}
}
}
void CodeGenerator::cgReload(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
assert(dst->numNeededRegs() == src->numNeededRegs());
for (int locIndex = 0; locIndex < src->numNeededRegs(); ++locIndex) {
auto dstReg = dst->getReg(locIndex);
auto sinfo = src->getSpillInfo(locIndex);
switch (sinfo.type()) {
case SpillInfo::MMX:
m_as. mov_mmx_reg64(sinfo.mmx(), dstReg);
break;
case SpillInfo::Memory:
m_as. load_reg64_disp_reg64(reg::rsp,
sizeof(uint64_t) * sinfo.mem(),
dstReg);
break;
}
}
}
void CodeGenerator::cgStPropWork(IRInstruction* inst, bool genTypeStore) {
SSATmp* obj = inst->getSrc(0);
SSATmp* prop = inst->getSrc(1);
SSATmp* src = inst->getSrc(2);
cgStore(obj->getReg(), prop->getValInt(), src, genTypeStore);
}
void CodeGenerator::cgStProp(IRInstruction* inst) {
cgStPropWork(inst, true);
}
void CodeGenerator::cgStPropNT(IRInstruction* inst) {
cgStPropWork(inst, false);
}
void CodeGenerator::cgStMemWork(IRInstruction* inst, bool genStoreType) {
SSATmp* addr = inst->getSrc(0);
SSATmp* offset = inst->getSrc(1);
SSATmp* src = inst->getSrc(2);
cgStore(addr->getReg(), offset->getValInt(), src, genStoreType);
}
void CodeGenerator::cgStMem(IRInstruction* inst) {
cgStMemWork(inst, true);
}
void CodeGenerator::cgStMemNT(IRInstruction* inst) {
cgStMemWork(inst, false);
}
void CodeGenerator::cgStRefWork(IRInstruction* inst, bool genStoreType) {
auto destReg = inst->getDst()->getReg();
auto addrReg = inst->getSrc(0)->getReg();
SSATmp* src = inst->getSrc(1);
cgStore(addrReg, 0, src, genStoreType);
if (destReg != InvalidReg) emitMovRegReg(m_as, addrReg, destReg);
}
void CodeGenerator::cgStRef(IRInstruction* inst) {
cgStRefWork(inst, true);
}
void CodeGenerator::cgStRefNT(IRInstruction* inst) {
cgStRefWork(inst, false);
}
static int64_t getLocalOffset(int64_t index) {
return -cellsToBytes(index + 1);
}
static int64_t getLocalOffset(SSATmp* index) {
return getLocalOffset(index->getValInt());
}
int CodeGenerator::getIterOffset(SSATmp* tmp) {
const Func* func = getCurFunc();
int64_t index = tmp->getValInt();
return -cellsToBytes(((index + 1) * kNumIterCells + func->numLocals()));
}
void CodeGenerator::cgStLoc(IRInstruction* inst) {
cgStore(inst->getSrc(0)->getReg(),
getLocalOffset(inst->getExtra<StLoc>()->locId),
inst->getSrc(1),
true /* store type */);
}
void CodeGenerator::cgStLocNT(IRInstruction* inst) {
cgStore(inst->getSrc(0)->getReg(),
getLocalOffset(inst->getExtra<StLocNT>()->locId),
inst->getSrc(1),
false /* store type */);
}
void CodeGenerator::cgSyncVMRegs(IRInstruction* inst) {
emitMovRegReg(m_as, inst->getSrc(0)->getReg(), rVmFp);
emitMovRegReg(m_as, inst->getSrc(1)->getReg(), rVmSp);
}
void CodeGenerator::cgExitTrace(IRInstruction* inst) {
SSATmp* func = inst->getSrc(0);
SSATmp* pc = inst->getSrc(1);
SSATmp* sp = inst->getSrc(2);
SSATmp* fp = inst->getSrc(3);
SSATmp* notTakenPC = nullptr;
IRInstruction* toSmash = nullptr;
assert(pc->isConst() && inst->getNumSrcs() <= 6);
TraceExitType::ExitType exitType = getExitType(inst->getOpcode());
if (exitType == TraceExitType::Normal && inst->getExtra<ExitTrace>()) {
// Unconditional trace exit
toSmash = inst->getExtra<ExitTrace>()->toSmash;
assert(toSmash);
} else if (exitType == TraceExitType::NormalCc) {
// Exit at trace end which is the target of a conditional branch
notTakenPC = inst->getSrc(4);
assert(notTakenPC->isConst());
if (inst->getExtra<ExitTraceCc>()) {
toSmash = inst->getExtra<ExitTraceCc>()->toSmash;
assert(toSmash);
}
}
using namespace HPHP::VM::Transl;
Asm& a = m_as; // Note: m_as is the same as m_atubs for Exit Traces,
// unless exit trace was moved to end of main trace
emitMovRegReg(a, sp->getReg(), rVmSp);
emitMovRegReg(a, fp->getReg(), rVmFp);
// Get the SrcKey for the dest
SrcKey destSK(func->getValFunc(), pc->getValInt());
switch(exitType) {
case TraceExitType::NormalCc:
if (toSmash) {
TCA smashAddr = toSmash->getTCA();
if (smashAddr == kIRDirectJmpInactive) {
// The jump in the main trace has been optimized away
// this exit trace is no longer needed
break;
}
// Patch the original jcc;jmp, don't emit another
IRInstruction* jcc = toSmash;
Opcode opc = jcc->getOpcode();
ConditionCode cc = queryJmpToCC(opc);
uint64_t taken = pc->getValInt();
uint64_t notTaken = notTakenPC->getValInt();
m_astubs.setcc(cc, rbyte(serviceReqArgRegs[4]));
m_tx64-> emitServiceReq(TranslatorX64::SRFlags::SRInline,
REQ_BIND_JMPCC_FIRST,
4ull,
smashAddr,
taken,
notTaken,
uint64_t(cc));
} else {
// NormalCc exit but not optimized to jcc directly to destination
m_tx64->emitBindJmp(a, destSK, REQ_BIND_JMP);
}
break;
case TraceExitType::Normal:
{
TCA smashAddr = toSmash ? toSmash->getTCA() : nullptr;
if (smashAddr) {
assert(smashAddr != kIRDirectJmpInactive);
if (smashAddr != kIRDirectJccJmpActive) {
// kIRDirectJccJmpActive only needs NormalCc exit in astubs
m_tx64->emitServiceReq(TranslatorX64::SRFlags::SRInline,
REQ_BIND_JMP, 2,
smashAddr,
uint64_t(destSK.offset()));
}
} else {
assert(smashAddr == kIRDirectJmpInactive);
m_tx64->emitBindJmp(a, destSK, REQ_BIND_JMP);
}
}
break;
case TraceExitType::Slow:
case TraceExitType::SlowNoProgress:
if (RuntimeOption::EnableInstructionCounts ||
HPHP::Trace::moduleEnabled(HPHP::Trace::stats, 3)) {
Stats::emitInc(m_as,
Stats::opcodeToIRPostStatCounter(
Op(*getCurFunc()->unit()->at(destSK.m_offset))),
-1,
Transl::CC_None,
true);
}
if (HPHP::Trace::moduleEnabled(HPHP::Trace::punt, 1)) {
VM::Op op = (VM::Op)*func->getValFunc()->unit()->at(destSK.m_offset);
std::string name = folly::format(
"exitSlow{}-{}",
exitType == TraceExitType::SlowNoProgress ? "-np" : "",
VM::opcodeToName(op)).str();
m_tx64->emitRecordPunt(a, name);
}
if (exitType == TraceExitType::Slow) {
m_tx64->emitBindJmp(a, destSK, REQ_BIND_JMP_NO_IR);
} else {
m_tx64->emitReqRetransNoIR(a, destSK);
}
break;
case TraceExitType::GuardFailure:
SrcRec* destSR = m_tx64->getSrcRec(destSK);
m_tx64->emitFallbackUncondJmp(a, *destSR);
break;
}
}
void CodeGenerator::cgExitTraceCc(IRInstruction* inst) {
cgExitTrace(inst);
}
void CodeGenerator::cgExitSlow(IRInstruction* inst) {
cgExitTrace(inst);
}
void CodeGenerator::cgExitSlowNoProgress(IRInstruction* inst) {
cgExitTrace(inst);
}
void CodeGenerator::cgExitGuardFailure(IRInstruction* inst) {
cgExitTrace(inst);
}
static void emitAssertFlagsNonNegative(CodeGenerator::Asm& as) {
ifThen(as, CC_NGE, [&] { as.int3(); });
}
static void emitAssertRefCount(CodeGenerator::Asm& as, PhysReg base) {
as.cmpl(HPHP::RefCountStaticValue, base[FAST_REFCOUNT_OFFSET]);
ifThen(as, CC_NBE, [&] { as.int3(); });
}
static void emitIncRef(CodeGenerator::Asm& as, PhysReg base) {
if (RuntimeOption::EvalHHIRGenerateAsserts) {
emitAssertRefCount(as, base);
}
// emit incref
as.addl(1, base[FAST_REFCOUNT_OFFSET]);
if (RuntimeOption::EvalHHIRGenerateAsserts) {
// Assert that the ref count is greater than zero
emitAssertFlagsNonNegative(as);
}
}
void CodeGenerator::cgIncRefWork(Type type, SSATmp* src) {
assert(type.maybeCounted());
auto increfMaybeStatic = [&] {
auto base = src->getReg(0);
if (!type.needsStaticBitCheck()) {
emitIncRef(m_as, base);
} else {
m_as.cmpl(RefCountStaticValue, base[FAST_REFCOUNT_OFFSET]);
ifThen(m_as, CC_NE, [&] { emitIncRef(m_as, base); });
}
};
if (type.isKnownDataType()) {
assert(IS_REFCOUNTED_TYPE(type.toDataType()));
increfMaybeStatic();
} else {
m_as.cmpl(KindOfRefCountThreshold, r32(src->getReg(1)));
ifThen(m_as, CC_NLE, [&] { increfMaybeStatic(); });
}
}
void CodeGenerator::cgIncRef(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
Type type = src->getType();
if (m_curTrace->isMain()) {
TRACE(3, "[counter] 1 IncRef in main traces\n");
}
cgIncRefWork(type, src);
shuffle2(m_as, src->getReg(0), src->getReg(1),
dst->getReg(0), dst->getReg(1));
}
void CodeGenerator::cgDecRefStack(IRInstruction* inst) {
Type type = inst->getTypeParam();
SSATmp* sp = inst->getSrc(0);
SSATmp* index = inst->getSrc(1);
cgDecRefMem(type,
sp->getReg(),
index->getValInt() * sizeof(Cell),
nullptr);
}
void CodeGenerator::cgDecRefThis(IRInstruction* inst) {
SSATmp* fp = inst->getSrc(0);
Block* exit = inst->getTaken();
auto fpReg = fp->getReg();
auto scratchReg = rScratch;
// Load AR->m_this into rScratch
m_as.loadq(fpReg[AROFF(m_this)], scratchReg);
auto decrefIfAvailable = [&] {
// Check if this is available and we're not in a static context instead
m_as.testb(1, rbyte(scratchReg));
ifThen(m_as, CC_Z, [&] {
// Currently we need to store zero back to m_this in case a local
// destructor does debug_backtrace.
m_as.storeq(0, fpReg[AROFF(m_this)]);
cgDecRefStaticType(Type::Obj, scratchReg, exit, true);
});
};
if (getCurFunc()->isPseudoMain()) {
// In pseudo-mains, emit check for presence of m_this
m_as.testq(scratchReg, scratchReg);
ifThen(m_as, CC_NZ, [&] { decrefIfAvailable(); });
} else {
decrefIfAvailable();
}
}
void CodeGenerator::cgDecRefLoc(IRInstruction* inst) {
cgDecRefMem(inst->getTypeParam(),
inst->getSrc(0)->getReg(),
getLocalOffset(inst->getExtra<DecRefLoc>()->locId),
inst->getTaken());
}
void CodeGenerator::cgGenericRetDecRefs(IRInstruction* inst) {
auto const rFp = inst->getSrc(0)->getReg();
auto const retVal = inst->getSrc(1);
auto const numLocals = inst->getSrc(2)->getValInt();
auto const rDest = inst->getDst()->getReg();
auto& a = m_as;
RegSet retvalRegs = retVal->getRegs();
assert(retvalRegs.size() <= 2);
/*
* The generic decref helpers preserve these two registers.
*
* XXX/TODO: we ideally shouldn't be moving the return value into
* these regs and then back; it'd be better to precolor allocation
* this way, or failing that remap the return value SSATmp with a
* separate instruction. This scheme also won't work for us once we
* want hackIR to support handling surprise flags, because
* setprofile will look on the VM stack for the return value.
*/
auto spillRegs = RegSet(r14).add(r15);
/*
* Since we're making a call using a custom ABI to the generic
* decref helper, it's important that our src and dest registers are
* allocated to the registers we expect, and that no other SSATmp's
* are still allocated to registers at this time.
*/
const auto UNUSED expectedLiveRegs = RegSet(rFp).add(rDest) | retvalRegs;
assert((m_curInst->getLiveRegs() - expectedLiveRegs).empty());
assert(rFp == rVmFp &&
"free locals helper assumes the frame pointer is rVmFp");
assert(rDest == rVmSp &&
"free locals helper adjusts rVmSp, which must be our dst reg");
if (!numLocals) {
a. lea (rFp[AROFF(m_r)], rDest);
return;
}
// Remove overlap so we don't move registers that are already in the
// saved set.
auto intersectedRegs = spillRegs & retvalRegs;
spillRegs -= intersectedRegs;
retvalRegs -= intersectedRegs;
auto grabPair = [&] (std::pair<PhysReg,PhysReg>& out) {
assert(!retvalRegs.empty() && !spillRegs.empty());
retvalRegs.findFirst(out.first);
spillRegs.findFirst(out.second);
retvalRegs.remove(out.first);
spillRegs.remove(out.second);
};
auto savePairA = std::make_pair(InvalidReg, InvalidReg);
auto savePairB = std::make_pair(InvalidReg, InvalidReg);
if (!retvalRegs.empty()) {
grabPair(savePairA);
if (!retvalRegs.empty()) {
grabPair(savePairB);
}
}
if (savePairA.first != InvalidReg) {
a. movq (savePairA.first, savePairA.second);
if (savePairB.first != InvalidReg) {
a.movq (savePairB.first, savePairB.second);
}
}
auto const target = numLocals > kNumFreeLocalsHelpers
? m_tx64->m_freeManyLocalsHelper
: m_tx64->m_freeLocalsHelpers[numLocals - 1];
a. subq (0x8, rsp); // For parity; callee does retq $0x8.
a. lea (rFp[-numLocals * sizeof(TypedValue)], rVmSp);
a. call (target);
recordSyncPoint(a);
if (savePairA.first != InvalidReg) {
a. movq (savePairA.second, savePairA.first);
if (savePairB.first != InvalidReg) {
a.movq (savePairB.second, savePairB.first);
}
}
}
static void
tv_release_generic(TypedValue* tv) {
assert(VM::Transl::tx64->stateIsDirty());
assert(tv->m_type >= KindOfString && tv->m_type <= KindOfRef);
g_destructors[typeToDestrIndex(tv->m_type)](tv->m_data.pref);
}
static void
tv_release_typed(RefData* pv, DataType dt) {
assert(VM::Transl::tx64->stateIsDirty());
assert(dt >= KindOfString && dt <= KindOfRef);
g_destructors[typeToDestrIndex(dt)](pv);
}
Address CodeGenerator::getDtorGeneric() {
return (Address)tv_release_generic;
}
Address CodeGenerator::getDtorTyped() {
return (Address)tv_release_typed;
}
//
// This method generates code that checks the static bit and jumps if the bit
// is set. If regIsCount is true, reg contains the _count field. Otherwise,
// it's assumed to contain m_data field.
//
// Return value: the address to be patched with the address to jump to in case
// the static bit is set. If the check is unnecessary, this method retuns NULL.
Address CodeGenerator::cgCheckStaticBit(Type type,
PhysReg reg,
bool regIsCount) {
if (!type.needsStaticBitCheck()) return NULL;
if (regIsCount) {
// reg has the _count value
m_as.cmp_imm32_reg32(RefCountStaticValue, reg);
} else {
// reg has the data pointer
m_as.cmp_imm32_disp_reg32(RefCountStaticValue, FAST_REFCOUNT_OFFSET, reg);
}
Address addrToPatch = m_as.code.frontier;
m_as.jcc8(CC_E, addrToPatch);
return addrToPatch;
}
//
// Using the given dataReg, this method generates code that checks the static
// bit out of dataReg, and emits a DecRef if needed.
// NOTE: the flags are left with the result of the DecRef's subtraction,
// which can then be tested immediately after this.
//
// Return value: the address to be patched if a RefCountedStaticValue check is
// emitted; NULL otherwise.
//
Address CodeGenerator::cgCheckStaticBitAndDecRef(Type type,
PhysReg dataReg,
Block* exit) {
assert(type.maybeCounted());
Address patchStaticCheck = nullptr;
const auto scratchReg = rScratch;
bool canUseScratch = dataReg != scratchReg;
// TODO: run experiments to check whether the 'if' code sequence
// is any better than the 'else' branch below; otherwise, always
// use the 'else' code sequence
if (type.needsStaticBitCheck() && canUseScratch) {
// If we need to check for static value, then load the _count into a
// register to avoid doing two loads. The generated sequence is:
//
// scratchReg = [dataReg + offset(_count)]
// if scratchReg == RefCountStaticValue then skip DecRef
// scratchReg = scratchReg - 1
// ( if exit != NULL, emit:
// jz exit
// )
// [dataReg + offset(_count)] = scratchReg
if (RuntimeOption::EvalHHIRGenerateAsserts) {
emitAssertRefCount(m_as, dataReg);
}
// Load _count in scratchReg
m_as.load_reg64_disp_reg32(dataReg, FAST_REFCOUNT_OFFSET, scratchReg);
// Check for RefCountStaticValue
patchStaticCheck = cgCheckStaticBit(type, scratchReg,
true /* reg has _count */);
// Decrement count and store it back in memory.
// If there's an exit, emit jump to it when _count would get down to 0
m_as.sub_imm32_reg32(1, scratchReg);
if (exit) {
emitFwdJcc(CC_E, exit);
}
if (RuntimeOption::EvalHHIRGenerateAsserts) {
// Assert that the ref count is greater than zero
emitAssertFlagsNonNegative(m_as);
}
m_as.store_reg32_disp_reg64(scratchReg, FAST_REFCOUNT_OFFSET, dataReg);
} else {
// Can't use scratch reg, so emit code that operates directly in
// memory. Compared to the sequence above, this will result in one
// extra load, but it has the advantage of producing a instruction
// sequence.
//
// ( if needStaticBitCheck, emit :
// cmp [dataReg + offset(_count)], RefCountStaticValue
// je LabelAfterDecRef
// )
// ( if exit != NULL, emit:
// cmp [dataReg + offset(_count)], 1
// jz exit
// )
// sub [dataReg + offset(_count)], 1
// If necessary, check for RefCountStaticValue
patchStaticCheck = cgCheckStaticBit(type, dataReg,
false /* passing dataReg */);
// If there's an exit, emit jump to it if _count would get down to 0
if (exit) {
m_as.cmp_imm32_disp_reg32(1, FAST_REFCOUNT_OFFSET, dataReg);
emitFwdJcc(CC_E, exit);
}
if (RuntimeOption::EvalHHIRGenerateAsserts) {
emitAssertRefCount(m_as, dataReg);
}
// Decrement _count
m_as.sub_imm32_disp_reg32(1, FAST_REFCOUNT_OFFSET, dataReg);
if (RuntimeOption::EvalHHIRGenerateAsserts) {
// Assert that the ref count is not less than zero
emitAssertFlagsNonNegative(m_as);
}
}
return patchStaticCheck;
}
//
// Returns the address to be patched with the address to jump to in case
// the type is not ref-counted.
//
Address CodeGenerator::cgCheckRefCountedType(PhysReg typeReg) {
m_as.cmp_imm32_reg32(KindOfRefCountThreshold, typeReg);
Address addrToPatch = m_as.code.frontier;
m_as.jcc8(CC_LE, addrToPatch);
return addrToPatch;
}
Address CodeGenerator::cgCheckRefCountedType(PhysReg baseReg,
int64_t offset) {
emitCmpTVType(m_as, KindOfRefCountThreshold, baseReg[offset + TVOFF(m_type)]);
Address addrToPatch = m_as.code.frontier;
m_as.jcc8(CC_LE, addrToPatch);
return addrToPatch;
}
//
// Generates dec-ref of a typed value with statically known type.
//
void CodeGenerator::cgDecRefStaticType(Type type,
PhysReg dataReg,
Block* exit,
bool genZeroCheck) {
assert(type != Type::Cell && type != Type::Gen);
assert(type.isKnownDataType());
if (type.notCounted()) return;
// Check for RefCountStaticValue if needed, do the actual DecRef,
// and leave flags set based on the subtract result, which is
// tested below
Address patchStaticCheck;
if (genZeroCheck) {
patchStaticCheck = cgCheckStaticBitAndDecRef(type, dataReg, exit);
} else {
// Set exit as NULL so that the code doesn't jump to error checking.
patchStaticCheck = cgCheckStaticBitAndDecRef(type, dataReg, nullptr);
}
// If not exiting on count down to zero, emit the zero-check and
// release call
if (genZeroCheck && exit == nullptr) {
// Emit jump to m_astubs (to call release) if count got down to zero
unlikelyIfBlock(CC_Z, [&] {
// Emit the call to release in m_astubs
cgCallHelper(m_astubs, m_tx64->getDtorCall(type.toDataType()),
InvalidReg, InvalidReg, kSyncPoint, ArgGroup().reg(dataReg));
});
}
if (patchStaticCheck) {
m_as.patchJcc8(patchStaticCheck, m_as.code.frontier);
}
}
//
// Generates dec-ref of a typed value with dynamic (statically unknown) type,
// when the type is stored in typeReg.
//
void CodeGenerator::cgDecRefDynamicType(PhysReg typeReg,
PhysReg dataReg,
Block* exit,
bool genZeroCheck) {
// Emit check for ref-counted type
Address patchTypeCheck = cgCheckRefCountedType(typeReg);
// Emit check for RefCountStaticValue and the actual DecRef
Address patchStaticCheck;
if (genZeroCheck) {
patchStaticCheck = cgCheckStaticBitAndDecRef(Type::Cell, dataReg, exit);
} else {
patchStaticCheck = cgCheckStaticBitAndDecRef(Type::Cell, dataReg, nullptr);
}
// If not exiting on count down to zero, emit the zero-check and release call
if (genZeroCheck && exit == nullptr) {
// Emit jump to m_astubs (to call release) if count got down to zero
unlikelyIfBlock(CC_Z, [&] {
// Emit call to release in m_astubs
cgCallHelper(m_astubs, getDtorTyped(), InvalidReg, kSyncPoint,
ArgGroup().reg(dataReg).reg(typeReg));
});
}
// Patch checks to jump around the DecRef
if (patchTypeCheck) m_as.patchJcc8(patchTypeCheck, m_as.code.frontier);
if (patchStaticCheck) m_as.patchJcc8(patchStaticCheck, m_as.code.frontier);
}
//
// Generates dec-ref of a typed value with dynamic (statically
// unknown) type, when all we have is the baseReg and offset of
// the typed value. This method assumes that baseReg is not the
// scratch register.
//
void CodeGenerator::cgDecRefDynamicTypeMem(PhysReg baseReg,
int64_t offset,
Block* exit) {
auto scratchReg = rScratch;
assert(baseReg != scratchReg);
// Emit check for ref-counted type
Address patchTypeCheck = cgCheckRefCountedType(baseReg, offset);
if (exit == nullptr && RuntimeOption::EvalHHIRGenericDtorHelper) {
{
// This PhysRegSaverParity saves rdi redundantly if
// !m_curInst->getLiveRegs().contains(rdi), but its
// necessary to maintain stack alignment. We can do better
// by making the helpers adjust the stack for us in the cold
// path, which calls the destructor.
PhysRegSaverParity<0> regSaver(m_as, RegSet(rdi));
if (offset == 0 && baseReg == rVmSp) {
// Decref'ing top of vm stack, very likely a popR
m_tx64->emitCall(m_as, m_tx64->m_irPopRHelper);
} else {
if (baseReg == rsp) {
// Because we just pushed %rdi, %rsp is 8 bytes below where
// offset is expecting it to be.
offset += sizeof(int64_t);
}
m_as.lea(baseReg[offset], rdi);
m_tx64->emitCall(m_as, m_tx64->m_dtorGenericStub);
}
recordSyncPoint(m_as);
}
if (patchTypeCheck) {
m_as.patchJcc8(patchTypeCheck, m_as.code.frontier);
}
return;
}
// Load m_data into the scratch reg
m_as.load_reg64_disp_reg64(baseReg, offset + TVOFF(m_data), scratchReg);
// Emit check for RefCountStaticValue and the actual DecRef
Address patchStaticCheck = cgCheckStaticBitAndDecRef(Type::Cell, scratchReg,
exit);
// If not exiting on count down to zero, emit the zero-check and release call
if (exit == nullptr) {
// Emit jump to m_astubs (to call release) if count got down to zero
unlikelyIfBlock(CC_Z, [&] {
// Emit call to release in m_astubs
m_astubs.lea_reg64_disp_reg64(baseReg, offset, scratchReg);
cgCallHelper(m_astubs, getDtorGeneric(), InvalidReg, kSyncPoint,
ArgGroup().reg(scratchReg));
});
}
// Patch checks to jump around the DecRef
if (patchTypeCheck) m_as.patchJcc8(patchTypeCheck, m_as.code.frontier);
if (patchStaticCheck) m_as.patchJcc8(patchStaticCheck, m_as.code.frontier);
}
//
// Generates the dec-ref of a typed value in memory address [baseReg + offset].
// This handles cases where type is either static or dynamic.
//
void CodeGenerator::cgDecRefMem(Type type,
PhysReg baseReg,
int64_t offset,
Block* exit) {
auto scratchReg = rScratch;
assert(baseReg != scratchReg);
if (type.needsReg()) {
// The type is dynamic, but we don't have two registers available
// to load the type and the data.
cgDecRefDynamicTypeMem(baseReg, offset, exit);
} else if (type.maybeCounted()) {
m_as.load_reg64_disp_reg64(baseReg, offset, scratchReg);
cgDecRefStaticType(type, scratchReg, exit, true);
}
}
void CodeGenerator::cgDecRefMem(IRInstruction* inst) {
assert(inst->getSrc(0)->getType().isPtr());
cgDecRefMem(inst->getTypeParam(),
inst->getSrc(0)->getReg(),
inst->getSrc(1)->getValInt(),
inst->getTaken());
}
void CodeGenerator::cgDecRefWork(IRInstruction* inst, bool genZeroCheck) {
SSATmp* src = inst->getSrc(0);
if (!isRefCounted(src)) return;
Block* exit = inst->getTaken();
Type type = src->getType();
if (type.isKnownDataType()) {
cgDecRefStaticType(type, src->getReg(), exit, genZeroCheck);
} else {
cgDecRefDynamicType(src->getReg(1),
src->getReg(0),
exit,
genZeroCheck);
}
}
void CodeGenerator::cgDecRef(IRInstruction *inst) {
// DecRef may bring the count to zero, and run the destructor.
// Generate code for this.
assert(!inst->getTaken());
cgDecRefWork(inst, true);
}
void CodeGenerator::cgDecRefNZ(IRInstruction* inst) {
// DecRefNZ cannot bring the count to zero.
// Therefore, we don't generate zero-checking code.
assert(!inst->getTaken());
cgDecRefWork(inst, false);
}
void CodeGenerator::emitSpillActRec(SSATmp* sp,
int64_t spOffset,
SSATmp* defAR) {
if (debug) {
// Ensure srcs of defAR are still live, since we use their registers.
for (SSATmp* UNUSED src : defAR->getInstruction()->getSrcs()) {
assert(src->getInstruction()->getOpcode() == DefConst ||
src->getLastUseId() >= m_curInst->getId());
}
}
auto* defInst = defAR->getInstruction();
SSATmp* fp = defInst->getSrc(0);
SSATmp* func = defInst->getSrc(1);
SSATmp* objOrCls = defInst->getSrc(2);
SSATmp* nArgs = defInst->getSrc(3);
SSATmp* magicName = defInst->getSrc(4);
DEBUG_ONLY bool setThis = true;
auto spReg = sp->getReg();
// actRec->m_this
if (objOrCls->isA(Type::Cls)) {
// store class
if (objOrCls->isConst()) {
m_as.store_imm64_disp_reg64(uintptr_t(objOrCls->getValClass()) | 1,
spOffset + AROFF(m_this),
spReg);
} else {
Reg64 clsPtrReg = objOrCls->getReg();
m_as.movq (clsPtrReg, rScratch);
m_as.orq (1, rScratch);
m_as.storeq(rScratch, spReg[spOffset + AROFF(m_this)]);
}
} else if (objOrCls->isA(Type::Obj)) {
// store this pointer
m_as.store_reg64_disp_reg64(objOrCls->getReg(),
spOffset + AROFF(m_this),
spReg);
} else if (objOrCls->isA(Type::Ctx)) {
// Stores either a this pointer or a Cctx -- statically unknown.
Reg64 objOrClsPtrReg = objOrCls->getReg();
m_as.storeq(objOrClsPtrReg, spReg[spOffset + AROFF(m_this)]);
} else {
assert(objOrCls->isA(Type::InitNull));
// no obj or class; this happens in FPushFunc
int offset_m_this = spOffset + AROFF(m_this);
// When func is either Type::FuncCls or Type::FuncCtx,
// m_this/m_cls will be initialized below
if (!func->isConst() && (func->isA(Type::FuncCtx))) {
// m_this is unioned with m_cls and will be initialized below
setThis = false;
} else {
m_as.store_imm64_disp_reg64(0, offset_m_this, spReg);
}
}
// actRec->m_invName
assert(magicName->isConst());
// ActRec::m_invName is encoded as a pointer with bit kInvNameBit
// set to distinguish it from m_varEnv and m_extrArgs
uintptr_t invName =
(magicName->getType().isNull()
? 0
: (uintptr_t(magicName->getValStr()) | ActRec::kInvNameBit));
m_as.store_imm64_disp_reg64(invName,
spOffset + AROFF(m_invName),
spReg);
// actRec->m_func and possibly actRec->m_cls
// Note m_cls is unioned with m_this and may overwrite previous value
if (func->getType().isNull()) {
assert(func->isConst());
} else if (func->isConst()) {
// TODO: have register allocator materialize constants
const Func* f = func->getValFunc();
m_as. mov_imm64_reg((uint64_t)f, rScratch);
m_as.store_reg64_disp_reg64(rScratch,
spOffset + AROFF(m_func),
spReg);
if (func->isA(Type::FuncCtx)) {
// Fill in m_cls if provided with both func* and class*
CG_PUNT(cgAllocActRec);
}
} else {
int offset_m_func = spOffset + AROFF(m_func);
m_as.store_reg64_disp_reg64(func->getReg(0),
offset_m_func,
spReg);
if (func->isA(Type::FuncCtx)) {
int offset_m_cls = spOffset + AROFF(m_cls);
m_as.store_reg64_disp_reg64(func->getReg(1),
offset_m_cls,
spReg);
setThis = true; /* m_this and m_cls are in a union */
}
}
assert(setThis);
// actRec->m_savedRbp
m_as.store_reg64_disp_reg64(fp->getReg(),
spOffset + AROFF(m_savedRbp),
spReg);
// actRec->m_numArgsAndCtorFlag
assert(nArgs->isConst());
m_as.store_imm32_disp_reg(nArgs->getValInt(),
spOffset + AROFF(m_numArgsAndCtorFlag),
spReg);
}
HOT_FUNC_VM static ActRec*
cgNewInstanceHelper(Class* cls,
int numArgs,
Cell* sp,
ActRec* prevAr) {
Cell* obj = sp - 1; // this is where the newly allocated object will go
ActRec* ar = (ActRec*)(uintptr_t(obj) - sizeof(ActRec));
Instance* newObj = newInstanceHelper(cls, numArgs, ar, prevAr);
// store obj into the stack
obj->m_data.pobj = newObj;
obj->m_type = KindOfObject;
return ar;
}
HOT_FUNC_VM static ActRec*
cgNewInstanceHelperCached(CacheHandle cacheHandle,
const StringData* clsName,
int numArgs,
Cell* sp,
ActRec* prevAr) {
Cell* obj = sp - 1; // this is where the newly allocated object will go
ActRec* ar = (ActRec*)(uintptr_t(obj) - sizeof(ActRec));
Instance* newObj = newInstanceHelperCached((Class**)handleToPtr(cacheHandle),
clsName,
numArgs,
ar,
prevAr);
// store obj into the stack
obj->m_data.pobj = newObj;
obj->m_type = KindOfObject;
return ar;
}
void CodeGenerator::cgNewObj(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* numParams = inst->getSrc(0);
SSATmp* clsName = inst->getSrc(1);
SSATmp* sp = inst->getSrc(2);
SSATmp* fp = inst->getSrc(3);
if (clsName->isString()) {
const StringData* classNameString = clsName->getValStr();
CacheHandle ch = allocKnownClass(classNameString);
ArgGroup args;
args.imm(ch)
.ssa(clsName)
.ssa(numParams)
.ssa(sp)
.ssa(fp);
cgCallHelper(m_as, (TCA)cgNewInstanceHelperCached, dst, kSyncPoint, args);
} else {
ArgGroup args;
args.ssa(clsName).ssa(numParams).ssa(sp).ssa(fp);
cgCallHelper(m_as, (TCA)cgNewInstanceHelper, dst, kSyncPoint, args);
}
}
void CodeGenerator::cgCall(IRInstruction* inst) {
SSATmp* actRec = inst->getSrc(0);
SSATmp* returnBcOffset = inst->getSrc(1);
SSATmp* func = inst->getSrc(2);
SrcRange args = inst->getSrcs().subpiece(3);
int32_t numArgs = args.size();
auto spReg = actRec->getReg();
// put all outgoing arguments onto the VM stack
int64_t adjustment = (-(int64_t)numArgs) * sizeof(Cell);
for (int32_t i = 0; i < numArgs; i++) {
// Type::None here means that the simplifier proved that the value
// matches the value already in memory, thus the store is redundant.
if (args[i]->getType() != Type::None) {
cgStore(spReg, -(i + 1) * sizeof(Cell), args[i]);
}
}
// store the return bytecode offset into the outgoing actrec
uint64_t returnBc = returnBcOffset->getValInt();
m_as.store_imm32_disp_reg(returnBc, AROFF(m_soff), spReg);
if (adjustment != 0) {
m_as.add_imm32_reg64(adjustment, spReg);
}
assert(m_state.lastMarker);
SrcKey srcKey = SrcKey(m_state.lastMarker->func, m_state.lastMarker->bcOff);
bool isImmutable = (func->isConst() && !func->getType().isNull());
const Func* funcd = isImmutable ? func->getValFunc() : nullptr;
assert(&m_as == &m_tx64->getAsm());
int32_t adjust = m_tx64->emitBindCall(srcKey, funcd, numArgs);
if (adjust) {
m_as.addq (adjust, rVmSp);
}
}
void CodeGenerator::cgCastStk(IRInstruction *inst) {
Type type = inst->getTypeParam();
SSATmp* sp = inst->getSrc(0);
SSATmp* off = inst->getSrc(1);
uint32_t offset = off->getValInt();
PhysReg spReg = sp->getReg();
ArgGroup args;
args.addr(spReg, cellsToBytes(offset));
TCA tvCastHelper;
if (type.subtypeOf(Type::Bool)) {
tvCastHelper = (TCA)tvCastToBooleanInPlace;
} else if (type.subtypeOf(Type::Int)) {
// if casting to integer, pass 10 as the base for the conversion
args.imm(10);
tvCastHelper = (TCA)tvCastToInt64InPlace;
} else if (type.subtypeOf(Type::Dbl)) {
tvCastHelper = (TCA)tvCastToDoubleInPlace;
} else if (type.subtypeOf(Type::Arr)) {
tvCastHelper = (TCA)tvCastToArrayInPlace;
} else if (type.subtypeOf(Type::Str)) {
tvCastHelper = (TCA)tvCastToStringInPlace;
} else if (type.subtypeOf(Type::Obj)) {
tvCastHelper = (TCA)tvCastToObjectInPlace;
} else {
not_reached();
}
cgCallHelper(m_as, tvCastHelper, nullptr,
kSyncPoint, args);
}
void CodeGenerator::cgCallBuiltin(IRInstruction* inst) {
SSATmp* f = inst->getSrc(0);
auto args = inst->getSrcs().subpiece(1);
int32_t numArgs = args.size();
SSATmp* dst = inst->getDst();
auto dstReg = dst->getReg(0);
auto dstType = dst->getReg(1);
Type returnType = inst->getTypeParam();
const Func* func = f->getValFunc();
PhysReg returnBase = rsp;
int returnOffset = HHIR_MISOFF(tvBuiltinReturn);
// Load args into registers
ArgGroup callArgs;
callArgs.ssas(inst, 1, numArgs);
// Call Builtin
BuiltinFunction nativeFuncPtr = func->nativeFuncPtr();
cgCallHelper(m_as,
(TCA)nativeFuncPtr,
dstReg,
kSyncPoint,
callArgs);
if (dstReg == InvalidReg) {
return;
}
// load return value from builtin
// for primitive return types (int, bool, etc), the return value
// is already in dstReg (the builtin call returns in rax). For return
// by reference (String, Object, Array, etc), the builtin writes the
// return value into MInstrState::tvBuiltinReturn TV, from where it
// has to be tested and copied.
if (returnType.isSimpleType()) {
return;
}
if (returnType.isReferenceType()) {
m_as. loadq (returnBase[returnOffset], dstReg);
emitLoadImm(m_as, returnType.toDataType(), dstType);
emitLoadImm(m_as, KindOfNull, rScratch);
m_as. testq (dstReg, dstReg);
m_as. cmov_reg64_reg64 (CC_Z, rScratch, dstType);
return;
}
if (returnType.subtypeOf(Type::Cell)
|| returnType.subtypeOf(Type::BoxedCell)) {
emitLoadTVType(m_as, returnBase[returnOffset + TVOFF(m_type)], dstType);
m_as. loadq (returnBase[returnOffset + TVOFF(m_data)], dstReg);
emitLoadImm(m_as, KindOfNull, rScratch);
static_assert(KindOfUninit == 0,
"CallBuiltin needs update for KindOfUninit");
m_as. testl (r32(dstType), r32(dstType));
m_as. cmov_reg64_reg64 (CC_Z, rScratch, dstType);
return;
}
not_reached();
}
void CodeGenerator::cgSpillStack(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* sp = inst->getSrc(0);
auto const spDeficit = inst->getSrc(1)->getValInt();
auto const spillVals = inst->getSrcs().subpiece(2);
auto const numSpillSrcs = spillVals.size();
auto const dstReg = dst->getReg();
auto const spReg = sp->getReg();
auto const spillCells = spillValueCells(inst);
int64_t adjustment = (spDeficit - spillCells) * sizeof(Cell);
for (uint32_t i = 0, cellOff = 0; i < numSpillSrcs; ++i) {
const int64_t offset = cellOff * sizeof(Cell) + adjustment;
if (spillVals[i]->getType() == Type::ActRec) {
emitSpillActRec(sp, offset, spillVals[i]);
cellOff += kNumActRecCells;
i += kSpillStackActRecExtraArgs;
} else if (spillVals[i]->getType() == Type::None) {
// The simplifier detected that we're storing the same value
// already in there.
++cellOff;
} else {
auto* val = spillVals[i];
auto* inst = val->getInstruction();
while (inst->isPassthrough()) {
inst = inst->getPassthroughValue()->getInstruction();
}
// If our value came from a LdStack on the same sp and offset,
// we don't need to spill it.
if (inst->getOpcode() == LdStack && inst->getSrc(0) == sp &&
inst->getSrc(1)->getValInt() * sizeof(Cell) == offset) {
FTRACE(1, "{}: Not spilling spill value {} from {}\n",
__func__, i, inst->toString());
} else {
cgStore(spReg, offset, val);
}
++cellOff;
}
}
if (adjustment != 0) {
if (dstReg != spReg) {
m_as.lea_reg64_disp_reg64(spReg, adjustment, dstReg);
} else {
m_as.add_imm32_reg64(adjustment, dstReg);
}
} else {
emitMovRegReg(m_as, spReg, dstReg);
}
}
void CodeGenerator::cgNativeImpl(IRInstruction* inst) {
SSATmp* func = inst->getSrc(0);
SSATmp* fp = inst->getSrc(1);
assert(func->isConst());
assert(func->getType() == Type::Func);
BuiltinFunction builtinFuncPtr = func->getValFunc()->builtinFuncPtr();
emitMovRegReg(m_as, fp->getReg(), argNumToRegName[0]);
m_as.call((TCA)builtinFuncPtr);
recordSyncPoint(m_as);
}
void CodeGenerator::cgLdThis(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* src = inst->getSrc(0);
Block* label = inst->getTaken();
// mov dst, [fp + 0x20]
auto dstReg = dst->getReg();
// the destination of LdThis could be dead but the instruction
// itself still useful because of the checks that it does (if it has
// a label). So we need to make sure there is a dstReg for this
// instruction.
if (dstReg != InvalidReg) {
// instruction's result is not dead
m_as.loadq(src->getReg()[AROFF(m_this)], dstReg);
}
if (label == NULL) return; // no need to perform its checks
if (dstReg != InvalidReg) {
// test 0x01, dst
m_as.testb(1, rbyte(dstReg));
} else {
m_as.testb(1, src->getReg()[AROFF(m_this)]);
}
// jnz label
emitFwdJcc(CC_NZ, label);
}
static void emitLdClsCctx(CodeGenerator::Asm& a,
PhysReg srcReg,
PhysReg dstReg) {
emitMovRegReg(a, srcReg, dstReg);
a. subq(1, dstReg);
}
void CodeGenerator::cgLdClsCtx(IRInstruction* inst) {
PhysReg srcReg = inst->getSrc(0)->getReg();
PhysReg dstReg = inst->getDst()->getReg();
// Context could be either a this object or a class ptr
m_as. testb(1, rbyte(srcReg));
ifThenElse(CC_NZ,
[&] { emitLdClsCctx(m_as, srcReg, dstReg); }, // ctx is a class
[&] { emitLdObjClass(m_as, srcReg, dstReg); } // ctx is this ptr
);
}
void CodeGenerator::cgLdClsCctx(IRInstruction* inst) {
PhysReg srcReg = inst->getSrc(0)->getReg();
PhysReg dstReg = inst->getDst()->getReg();
emitLdClsCctx(m_as, srcReg, dstReg);
}
void CodeGenerator::cgLdCtx(IRInstruction* inst) {
PhysReg dstReg = inst->getDst()->getReg();
PhysReg srcReg = inst->getSrc(0)->getReg();
if (dstReg != InvalidReg) {
m_as.loadq(srcReg[AROFF(m_this)], dstReg);
}
}
void CodeGenerator::cgLdCctx(IRInstruction* inst) {
return cgLdCtx(inst);
}
void CodeGenerator::cgLdConst(IRInstruction* inst) {
auto const dstReg = inst->getDst()->getReg();
auto const val = inst->getExtra<LdConst>()->as<uintptr_t>();
if (dstReg == InvalidReg) return;
emitLoadImm(m_as, val, dstReg);
}
void CodeGenerator::cgLdARFuncPtr(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* baseAddr = inst->getSrc(0);
SSATmp* offset = inst->getSrc(1);
auto dstReg = dst->getReg();
auto baseReg = baseAddr->getReg();
assert(offset->isConst());
m_as.load_reg64_disp_reg64(baseReg,
offset->getValInt() + AROFF(m_func),
dstReg);
}
void CodeGenerator::cgLdContLocalsPtr(IRInstruction* inst) {
auto rCont = inst->getSrc(0)->getReg();
auto rLocals = inst->getDst()->getReg();
m_as. loadl (rCont[CONTOFF(m_localsOffset)], r32(rLocals));
m_as. addq (rCont, rLocals);
}
static int getNativeTypeSize(Type type) {
if (type.subtypeOf(Type::Int | Type::Func)) return sz::qword;
if (type.subtypeOf(Type::Bool)) return sz::byte;
not_implemented();
}
void CodeGenerator::cgLdRaw(IRInstruction* inst) {
SSATmp* dest = inst->getDst();
SSATmp* addr = inst->getSrc(0);
SSATmp* offset = inst->getSrc(1);
assert(!(dest->isConst()));
Reg64 addrReg = addr->getReg();
PhysReg destReg = dest->getReg();
if (addr->isConst()) {
addrReg = rScratch;
emitLoadImm(m_as, addr->getValRawInt(), addrReg);
}
if (offset->isConst()) {
assert(offset->getType() == Type::Int);
int64_t kind = offset->getValInt();
RawMemSlot& slot = RawMemSlot::Get(RawMemSlot::Kind(kind));
int ldSize = slot.getSize();
int64_t off = slot.getOffset();
if (ldSize == sz::qword) {
m_as.loadq (addrReg[off], destReg);
} else if (ldSize == sz::dword) {
m_as.loadl (addrReg[off], r32(destReg));
} else {
assert(ldSize == sz::byte);
m_as.loadzbl (addrReg[off], r32(destReg));
}
} else {
int ldSize = getNativeTypeSize(dest->getType());
Reg64 offsetReg = r64(offset->getReg());
if (ldSize == sz::qword) {
m_as.loadq (addrReg[offsetReg], destReg);
} else {
// Not yet supported by our assembler
assert(ldSize == sz::byte);
not_implemented();
}
}
}
void CodeGenerator::cgStRaw(IRInstruction* inst) {
auto baseReg = inst->getSrc(0)->getReg();
int64_t kind = inst->getSrc(1)->getValInt();
SSATmp* value = inst->getSrc(2);
RawMemSlot& slot = RawMemSlot::Get(RawMemSlot::Kind(kind));
assert(value->getType().equals(slot.getType()));
int stSize = slot.getSize();
int64_t off = slot.getOffset();
auto dest = baseReg[off];
if (value->isConst()) {
if (stSize == sz::qword) {
m_as.storeq(value->getValRawInt(), dest);
} else if (stSize == sz::dword) {
m_as.storel(value->getValRawInt(), dest);
} else {
assert(stSize == sz::byte);
m_as.storeb(value->getValBool(), dest);
}
} else {
if (stSize == sz::qword) {
m_as.storeq(r64(value->getReg()), dest);
} else if (stSize == sz::dword) {
m_as.storel(r32(value->getReg()), dest);
} else {
assert(stSize == sz::byte);
m_as.storeb(rbyte(value->getReg()), dest);
}
}
}
// If label is set and type is not Gen, this method generates a check
// that bails to the label if the loaded typed value doesn't match type.
void CodeGenerator::cgLoadTypedValue(PhysReg base,
int64_t off,
IRInstruction* inst) {
Block* label = inst->getTaken();
Type type = inst->getTypeParam();
SSATmp* dst = inst->getDst();
assert(type == dst->getType());
assert(type.needsReg());
auto valueDstReg = dst->getReg(0);
auto typeDstReg = dst->getReg(1);
if (valueDstReg == InvalidReg && typeDstReg == InvalidReg &&
(label == nullptr || type == Type::Gen)) {
// a dead load
return;
}
bool useScratchReg = (base == typeDstReg && valueDstReg != InvalidReg);
if (useScratchReg) {
// Save base to rScratch, because base will be overwritten.
m_as.mov_reg64_reg64(base, reg::rScratch);
}
// Load type if it's not dead
if (typeDstReg != InvalidReg) {
emitLoadTVType(m_as, base[off + TVOFF(m_type)], typeDstReg);
if (label) {
// Check type needed
emitGuardType(r32(typeDstReg), inst);
}
} else if (label) {
// Check type needed
cgGuardTypeCell(base, off, inst);
}
// Load value if it's not dead
if (valueDstReg == InvalidReg) return;
if (useScratchReg) {
m_as.load_reg64_disp_reg64(reg::rScratch, off + TVOFF(m_data), valueDstReg);
} else {
m_as.load_reg64_disp_reg64(base, off + TVOFF(m_data), valueDstReg);
}
}
void CodeGenerator::cgStoreTypedValue(PhysReg base,
int64_t off,
SSATmp* src) {
assert(src->getType().needsReg());
m_as.store_reg64_disp_reg64(src->getReg(0),
off + TVOFF(m_data),
base);
emitStoreTVType(m_as, src->getReg(1), base[off + TVOFF(m_type)]);
}
void CodeGenerator::cgStore(PhysReg base,
int64_t off,
SSATmp* src,
bool genStoreType) {
Type type = src->getType();
if (type.needsReg()) {
cgStoreTypedValue(base, off, src);
return;
}
// store the type
if (genStoreType) {
emitStoreTVType(m_as, type.toDataType(), base[off + TVOFF(m_type)]);
}
if (type.isNull()) {
// no need to store a value for null or uninit
return;
}
if (src->isConst()) {
int64_t val = 0;
if (type.subtypeOf(Type::Bool | Type::Int | Type::Dbl |
Type::Arr | Type::StaticStr | Type::Cls)) {
val = src->getValBits();
} else {
not_reached();
}
m_as.store_imm64_disp_reg64(val, off + TVOFF(m_data), base);
} else {
zeroExtendIfBool(m_as, src);
m_as.store_reg64_disp_reg64(src->getReg(),
off + TVOFF(m_data),
base);
}
}
void CodeGenerator::emitGuardOrFwdJcc(IRInstruction* inst, ConditionCode cc) {
if (cc == CC_None) return;
Block* label = inst->getTaken();
if (inst && inst->getTCA() == kIRDirectGuardActive) {
if (RuntimeOption::EvalDumpIR) {
m_tx64->prepareForSmash(m_as, TranslatorX64::kJmpccLen);
inst->setTCA(m_as.code.frontier);
}
// Get the SrcKey for the dest
SrcKey destSK(getCurFunc(), m_curTrace->getBcOff());
SrcRec* destSR = m_tx64->getSrcRec(destSK);
m_tx64->emitFallbackCondJmp(m_as, *destSR, cc);
} else {
emitFwdJcc(cc, label);
}
}
void CodeGenerator::cgLoad(PhysReg base,
int64_t off,
IRInstruction* inst) {
Type type = inst->getTypeParam();
if (type.needsReg()) {
return cgLoadTypedValue(base, off, inst);
}
Block* label = inst->getTaken();
if (label != NULL) {
cgGuardTypeCell(base, off, inst);
}
if (type.isNull()) return; // these are constants
auto dstReg = inst->getDst()->getReg();
// if dstReg == InvalidReg then the value of this load is dead
if (dstReg == InvalidReg) return;
if (type == Type::Bool) {
m_as.load_reg64_disp_reg32(base, off + TVOFF(m_data), dstReg);
} else {
m_as.load_reg64_disp_reg64(base, off + TVOFF(m_data), dstReg);
}
}
void CodeGenerator::cgLdProp(IRInstruction* inst) {
cgLoad(inst->getSrc(0)->getReg(), inst->getSrc(1)->getValInt(), inst);
}
void CodeGenerator::cgLdMem(IRInstruction * inst) {
cgLoad(inst->getSrc(0)->getReg(), inst->getSrc(1)->getValInt(), inst);
}
void CodeGenerator::cgLdRef(IRInstruction* inst) {
cgLoad(inst->getSrc(0)->getReg(), 0, inst);
}
void CodeGenerator::recordSyncPoint(Asm& as,
SyncOptions sync /* = kSyncPoint */) {
assert(m_state.lastMarker);
assert(sync != kNoSyncPoint);
Offset stackOff = m_state.lastMarker->stackOff - (sync - kSyncPoint);
Offset pcOff = m_state.lastMarker->bcOff - m_state.lastMarker->func->base();
m_tx64->recordSyncPoint(as, pcOff, stackOff);
}
void CodeGenerator::cgLdAddr(IRInstruction* inst) {
auto base = inst->getSrc(0)->getReg();
int64_t offset = inst->getSrc(1)->getValInt();
m_as.lea (base[offset], inst->getDst()->getReg());
}
void CodeGenerator::cgLdLoc(IRInstruction* inst) {
cgLoad(inst->getSrc(0)->getReg(),
getLocalOffset(inst->getExtra<LdLoc>()->locId),
inst);
}
void CodeGenerator::cgLdLocAddr(IRInstruction* inst) {
auto const fpReg = inst->getSrc(0)->getReg();
auto const offset = getLocalOffset(inst->getExtra<LdLocAddr>()->locId);
if (inst->getDst()->hasReg()) {
m_as.lea(fpReg[offset], inst->getDst()->getReg());
}
}
void CodeGenerator::cgLdStackAddr(IRInstruction* inst) {
auto base = inst->getSrc(0)->getReg();
int64_t offset = cellsToBytes(inst->getSrc(1)->getValInt());
m_as.lea (base[offset], inst->getDst()->getReg());
}
void CodeGenerator::cgLdStack(IRInstruction* inst) {
assert(inst->getTaken() == nullptr);
cgLoad(inst->getSrc(0)->getReg(),
cellsToBytes(inst->getSrc(1)->getValInt()),
inst);
}
void CodeGenerator::cgGuardStk(IRInstruction* inst) {
cgGuardTypeCell(inst->getSrc(0)->getReg(),
cellsToBytes(inst->getSrc(1)->getValInt()),
inst);
}
void CodeGenerator::cgGuardLoc(IRInstruction* inst) {
cgGuardTypeCell(inst->getSrc(0)->getReg(),
getLocalOffset(inst->getExtra<GuardLoc>()->locId),
inst);
}
void CodeGenerator::cgDefMIStateBase(IRInstruction* inst) {
assert(inst->getDst()->getType() == Type::PtrToCell);
assert(inst->getDst()->getReg() == rsp);
}
void CodeGenerator::cgGuardType(IRInstruction* inst) {
Type type = inst->getTypeParam();
SSATmp* src = inst->getSrc(0);
auto srcTypeReg = src->getReg(1);
assert(srcTypeReg != InvalidReg);
ConditionCode cc;
cc = emitTypeTest(type, r32(srcTypeReg), true);
emitFwdJcc(cc, inst->getTaken());
auto dstReg = inst->getDst()->getReg();
if (dstReg != InvalidReg) {
emitMovRegReg(m_as, src->getReg(0), dstReg);
}
}
void CodeGenerator::cgGuardRefs(IRInstruction* inst) {
assert(inst->getNumSrcs() == 6);
SSATmp* funcPtrTmp = inst->getSrc(0);
SSATmp* nParamsTmp = inst->getSrc(1);
SSATmp* bitsPtrTmp = inst->getSrc(2);
SSATmp* firstBitNumTmp = inst->getSrc(3);
SSATmp* mask64Tmp = inst->getSrc(4);
SSATmp* vals64Tmp = inst->getSrc(5);
Block* exitLabel = inst->getTaken();
// Get values in place
assert(funcPtrTmp->getType() == Type::Func);
auto funcPtrReg = funcPtrTmp->getReg();
assert(funcPtrReg != InvalidReg);
assert(nParamsTmp->getType() == Type::Int);
auto nParamsReg = nParamsTmp->getReg();
assert(nParamsReg != InvalidReg);
assert(bitsPtrTmp->getType() == Type::Int);
auto bitsPtrReg = bitsPtrTmp->getReg();
assert(bitsPtrReg != InvalidReg);
assert(firstBitNumTmp->isConst() && firstBitNumTmp->getType() == Type::Int);
uint32_t firstBitNum = (uint32_t)(firstBitNumTmp->getValInt());
assert(mask64Tmp->getType() == Type::Int);
assert(mask64Tmp->getInstruction()->getOpcode() == LdConst);
auto mask64Reg = mask64Tmp->getReg();
assert(mask64Reg != InvalidReg);
int64_t mask64 = mask64Tmp->getValInt();
assert(vals64Tmp->getType() == Type::Int);
assert(vals64Tmp->getInstruction()->getOpcode() == LdConst);
auto vals64Reg = vals64Tmp->getReg();
assert(vals64Reg != InvalidReg);
int64_t vals64 = vals64Tmp->getValInt();
auto thenBody = [&] {
auto bitsValReg = rScratch;
// Load the bit values in bitValReg:
// bitsValReg <- [bitsValPtr + (firstBitNum / 64)]
m_as.load_reg64_disp_reg64(bitsPtrReg, sizeof(uint64_t) * (firstBitNum / 64),
bitsValReg);
// bitsValReg <- bitsValReg & mask64
m_as.and_reg64_reg64(mask64Reg, bitsValReg);
// If bitsValReg != vals64Reg, then goto Exit
m_as.cmp_reg64_reg64(bitsValReg, vals64Reg);
emitFwdJcc(CC_NE, exitLabel);
};
// If few enough args...
m_as.cmp_imm32_reg32(firstBitNum + 1, nParamsReg);
if (vals64 == 0 && mask64 == 0) {
ifThen(m_as, CC_NL, thenBody);
} else if (vals64 != 0 && vals64 != mask64) {
emitFwdJcc(CC_L, exitLabel);
thenBody();
} else if (vals64 != 0) {
ifThenElse(CC_NL, thenBody, /* else */ [&] {
// If not special builtin...
m_as.test_imm32_disp_reg32(AttrVariadicByRef, Func::attrsOff(), funcPtrReg);
emitFwdJcc(CC_Z, exitLabel);
});
} else {
ifThenElse(CC_NL, thenBody, /* else */ [&] {
m_as.test_imm32_disp_reg32(AttrVariadicByRef, Func::attrsOff(), funcPtrReg);
emitFwdJcc(CC_NZ, exitLabel);
});
}
}
void CodeGenerator::cgLdPropAddr(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* obj = inst->getSrc(0);
SSATmp* prop = inst->getSrc(1);
assert(prop->isConst() && prop->getType() == Type::Int);
auto dstReg = dst->getReg();
auto objReg = obj->getReg();
assert(objReg != InvalidReg);
assert(dstReg != InvalidReg);
int64_t offset = prop->getValInt();
m_as.lea_reg64_disp_reg64(objReg, offset, dstReg);
}
void CodeGenerator::cgLdClsMethod(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* cls = inst->getSrc(0);
SSATmp* mSlot = inst->getSrc(1);
assert(cls->getType() == Type::Cls);
assert(mSlot->isConst() && mSlot->getType() == Type::Int);
uint64_t mSlotInt64 = mSlot->getValRawInt();
// We're going to multiply mSlotVal by sizeof(Func*) and use
// it as a 32-bit offset (methOff) below.
if (mSlotInt64 > (std::numeric_limits<uint32_t>::max() / sizeof(Func*))) {
CG_PUNT(cgLdClsMethod_large_offset);
}
int32_t mSlotVal = (uint32_t) mSlotInt64;
Reg64 dstReg = dst->getReg();
assert(dstReg != InvalidReg);
Reg64 clsReg = cls->getReg();
if (clsReg == InvalidReg) {
CG_PUNT(LdClsMethod);
}
Offset vecOff = Class::getMethodsOffset() + Class::MethodMap::vecOff();
int32_t methOff = mSlotVal * sizeof(Func*);
m_as.loadq(clsReg[vecOff], dstReg);
m_as.loadq(dstReg[methOff], dstReg);
}
void CodeGenerator::cgLdClsMethodCache(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* className = inst->getSrc(0);
SSATmp* methodName = inst->getSrc(1);
SSATmp* baseClass = inst->getSrc(2);
Block* label = inst->getTaken();
// Stats::emitInc(a, Stats::TgtCache_StaticMethodHit);
const StringData* cls = className->getValStr();
const StringData* method = methodName->getValStr();
auto const ne = baseClass->getValNamedEntity();
TargetCache::CacheHandle ch =
TargetCache::StaticMethodCache::alloc(cls,
method,
getContextName(getCurClass()));
auto funcDestReg = dst->getReg(0);
auto classDestReg = dst->getReg(1);
auto offsetof_func = offsetof(TargetCache::StaticMethodCache, m_func);
auto offsetof_cls = offsetof(TargetCache::StaticMethodCache, m_cls);
assert(funcDestReg != InvalidReg && classDestReg != InvalidReg);
// Attempt to retrieve the func* and class* from cache
m_as.loadq(rVmTl[ch + offsetof_func], funcDestReg);
m_as.loadq(rVmTl[ch + offsetof_cls], classDestReg);
m_as.testq(funcDestReg, funcDestReg);
// May have retrieved a NULL from the cache
// handle case where method is not entered in the cache
unlikelyIfBlock(CC_E, [&] {
if (false) { // typecheck
const UNUSED Func* f = StaticMethodCache::lookupIR(ch, ne, cls, method);
}
// can raise an error if class is undefined
cgCallHelper(m_astubs,
(TCA)StaticMethodCache::lookupIR,
funcDestReg,
kSyncPoint,
ArgGroup().imm(ch) // Handle ch
.immPtr(ne) // NamedEntity* np.second
.immPtr(cls) // className
.immPtr(method) // methodName
);
// recordInstrCall is done in cgCallHelper
m_astubs.testq(funcDestReg, funcDestReg);
m_astubs.loadq(rVmTl[ch + offsetof_cls], classDestReg);
// if StaticMethodCache::lookupIR() returned NULL, jmp to label
emitFwdJcc(m_astubs, CC_Z, label);
});
}
/**
* Helper to emit getting the value for ActRec's m_this/m_cls slot
* from a This pointer depending on whether the callee method is
* static or not.
*/
void CodeGenerator::emitGetCtxFwdCallWithThis(PhysReg ctxReg,
bool staticCallee) {
if (staticCallee) {
// Load (this->m_cls | 0x1) into ctxReg.
m_as.loadq(ctxReg[ObjectData::getVMClassOffset()], ctxReg);
m_as.orq(1, ctxReg);
} else {
// Just incref $this.
emitIncRef(m_as, ctxReg);
}
}
/**
* This method is similar to emitGetCtxFwdCallWithThis above,
* but whether or not the callee is a static method is uknown at JIT time,
* and that is determined dynamically by looking up into the StaticMethodFCache.
*/
void CodeGenerator::emitGetCtxFwdCallWithThisDyn(PhysReg destCtxReg,
PhysReg thisReg,
CacheHandle& ch) {
Label NonStaticCall, End;
// thisReg is holding $this. Should we pass it to the callee?
m_as.cmpl(1, rVmTl[ch + offsetof(StaticMethodFCache, m_static)]);
m_as.jcc8(CC_NE, NonStaticCall);
// If calling a static method...
{
// Load (this->m_cls | 0x1) into destCtxReg
m_as.loadq(thisReg[ObjectData::getVMClassOffset()], destCtxReg);
m_as.orq(1, destCtxReg);
m_as.jmp8(End);
}
// Else: calling non-static method
{
asm_label(m_as, NonStaticCall);
emitMovRegReg(m_as, thisReg, destCtxReg);
emitIncRef(m_as, destCtxReg);
}
asm_label(m_as, End);
}
void CodeGenerator::cgGetCtxFwdCall(IRInstruction* inst) {
PhysReg destCtxReg = inst->getDst()->getReg(0);
SSATmp* srcCtxTmp = inst->getSrc(0);
const Func* callee = inst->getSrc(1)->getValFunc();
bool withThis = srcCtxTmp->isA(Type::Obj);
// Eagerly move src into the dest reg
emitMovRegReg(m_as, srcCtxTmp->getReg(0), destCtxReg);
Label End;
// If we don't know whether we have a This, we need to check dynamically
if (!withThis) {
m_as.testb(1, rbyte(destCtxReg));
m_as.jcc8(CC_NZ, End);
}
// If we have a This pointer in destCtxReg, then select either This
// or its Class based on whether callee is static or not
emitGetCtxFwdCallWithThis(destCtxReg, (callee->attrs() & AttrStatic));
asm_label(m_as, End);
}
void CodeGenerator::cgLdClsMethodFCache(IRInstruction* inst) {
PhysReg funcDestReg = inst->getDst()->getReg(0);
PhysReg destCtxReg = inst->getDst()->getReg(1);
const Class* cls = inst->getSrc(0)->getValClass();
const StringData* methName = inst->getSrc(1)->getValStr();
SSATmp* srcCtxTmp = inst->getSrc(2);
PhysReg srcCtxReg = srcCtxTmp->getReg(0);
Block* exitLabel = inst->getTaken();
const StringData* clsName = cls->name();
CacheHandle ch = StaticMethodFCache::alloc(clsName, methName,
getContextName(getCurClass()));
assert(funcDestReg != InvalidReg && destCtxReg != InvalidReg);
emitMovRegReg(m_as, srcCtxReg, destCtxReg);
m_as.loadq(rVmTl[ch], funcDestReg);
m_as.testq(funcDestReg, funcDestReg);
Label End;
// Handle case where method is not entered in the cache
unlikelyIfBlock(CC_E, [&] {
if (false) { // typecheck
const UNUSED Func* f = StaticMethodFCache::lookupIR(ch, cls, methName);
}
// preserve destCtxReg across the call since it wouldn't be otherwise
inst->setLiveRegs(inst->getLiveRegs().add(destCtxReg));
cgCallHelper(m_astubs,
(TCA)StaticMethodFCache::lookupIR,
funcDestReg,
kSyncPoint,
ArgGroup().imm(ch)
.immPtr(cls)
.immPtr(methName));
// If entry found in target cache, jump back to m_as.
// Otherwise, bail to exit label
m_astubs.testq(funcDestReg, funcDestReg);
emitFwdJcc(m_astubs, CC_Z, exitLabel);
});
auto t = srcCtxTmp->getType();
assert(!t.equals(Type::Cls));
if (t.equals(Type::Cctx)) {
return; // done: destCtxReg already has srcCtxReg
} else if (t == Type::Obj) {
// unconditionally run code produced by emitGetCtxFwdCallWithThisDyn below
// break
} else if (t == Type::Ctx) {
// dynamically check if we have a This pointer and
// call emitGetCtxFwdCallWithThisDyn below
m_as.testb(1, rbyte(destCtxReg));
m_as.jcc8(CC_NZ, End);
} else {
not_reached();
}
// If we have a 'this' pointer ...
emitGetCtxFwdCallWithThisDyn(destCtxReg, destCtxReg, ch);
asm_label(m_as, End);
}
void CodeGenerator::cgLdClsPropAddrCached(IRInstruction* inst) {
using namespace Transl::TargetCache;
SSATmp* dst = inst->getDst();
SSATmp* cls = inst->getSrc(0);
SSATmp* propName = inst->getSrc(1);
SSATmp* clsName = inst->getSrc(2);
SSATmp* cxt = inst->getSrc(3);
Block* target = inst->getTaken();
const StringData* propNameString = propName->getValStr();
const StringData* clsNameString = clsName->getValStr();
string sds(Util::toLower(clsNameString->data()) + ":" +
string(propNameString->data(), propNameString->size()));
StackStringData sd(sds.c_str(), sds.size(), AttachLiteral);
CacheHandle ch = SPropCache::alloc(&sd);
auto dstReg = dst->getReg();
// Cls is live in the slow path call to lookupIR, so we have to be
// careful not to clobber it before the branch to slow path. So
// use the scratch register as a temporary destination if cls is
// assigned the same register as the dst register.
auto tmpReg = dstReg;
if (dstReg == InvalidReg || dstReg == cls->getReg()) {
tmpReg = PhysReg(rScratch);
}
// Could be optimized to cmp against zero when !label && dstReg == InvalidReg
m_as.loadq(rVmTl[ch], tmpReg);
m_as.testq(tmpReg, tmpReg);
unlikelyIfBlock(CC_E, [&] {
cgCallHelper(m_astubs,
target ? (TCA)SPropCache::lookupIR<false>
: (TCA)SPropCache::lookupIR<true>, // raise on error
tmpReg,
kSyncPoint, // could re-enter to initialize properties
ArgGroup().imm(ch).ssa(cls).ssa(propName).ssa(cxt));
if (target) {
m_astubs.testq(tmpReg, tmpReg);
emitFwdJcc(m_astubs, CC_Z, target);
}
});
if (dstReg != InvalidReg) {
emitMovRegReg(m_as, tmpReg, dstReg);
}
}
void CodeGenerator::cgLdClsPropAddr(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* cls = inst->getSrc(0);
SSATmp* prop = inst->getSrc(1);
SSATmp* cxt = inst->getSrc(2);
Block* target = inst->getTaken();
auto dstReg = dst->getReg();
if (dstReg == InvalidReg && target) {
// result is unused but this instruction was not eliminated
// because its essential
dstReg = rScratch;
}
cgCallHelper(m_as,
target ? (TCA)SPropCache::lookupSProp<false>
: (TCA)SPropCache::lookupSProp<true>, // raise on error
dstReg,
kSyncPoint, // could re-enter to initialize properties
ArgGroup().ssa(cls).ssa(prop).ssa(cxt));
if (target) {
m_as.testq(dstReg, dstReg);
emitFwdJcc(m_as, CC_Z, target);
}
}
void CodeGenerator::cgLdCachedClass(IRInstruction* inst) {
const StringData* classNameString = inst->getSrc(0)->getValStr();
auto ch = TargetCache::allocKnownClass(classNameString);
m_as. loadq (rVmTl[ch], inst->getDst()->getReg());
}
void CodeGenerator::cgLdClsCached(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* className = inst->getSrc(0);
// Note the redundancy with LdCachedClass above...
const StringData* classNameString = className->getValStr();
auto ch = TargetCache::allocKnownClass(classNameString);
auto dstReg = dst->getReg();
if (dstReg == InvalidReg) {
m_as. cmpq (0, rVmTl[ch]);
} else {
m_as. loadq (rVmTl[ch], dstReg);
m_as. testq (dstReg, dstReg);
}
unlikelyIfBlock(CC_E, [&] {
// Passing only two arguments to lookupKnownClass, since the
// third is ignored in the checkOnly==false case.
cgCallHelper(m_astubs,
(TCA)TargetCache::lookupKnownClass<false>,
dst,
kSyncPoint,
ArgGroup().addr(rVmTl, intptr_t(ch)).ssa(className));
});
}
void CodeGenerator::cgLdCls(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* className = inst->getSrc(0);
CacheHandle ch = ClassCache::alloc();
cgCallHelper(m_as, (TCA)ClassCache::lookup, dst, kSyncPoint,
ArgGroup().imm(ch).ssa(className));
}
static StringData* fullConstName(SSATmp* cls, SSATmp* cnsName) {
return StringData::GetStaticString(
Util::toLower(cls->getValStr()->data()) + "::" +
cnsName->getValStr()->data());
}
void CodeGenerator::cgLdClsCns(IRInstruction* inst) {
SSATmp* cnsName = inst->getSrc(0);
SSATmp* cls = inst->getSrc(1);
StringData* fullName = fullConstName(cls, cnsName);
TargetCache::CacheHandle ch = TargetCache::allocClassConstant(fullName);
// note that we bail from the trace if the target cache entry is empty
// for this class constant or if the type assertion fails.
// TODO: handle the slow case helper call.
cgLoad(rVmTl, ch, inst);
}
void CodeGenerator::cgLookupClsCns(IRInstruction* inst) {
SSATmp* cnsName = inst->getSrc(0);
SSATmp* cls = inst->getSrc(1);
assert(inst->getTypeParam() == Type::Cell);
assert(cnsName->isConst() && cnsName->getType() == Type::StaticStr);
assert(cls->isConst() && cls->getType() == Type::StaticStr);
StringData* fullName = fullConstName(cls, cnsName);
TargetCache::CacheHandle ch = TargetCache::allocClassConstant(fullName);
ArgGroup args;
args.addr(rVmTl, ch)
.immPtr(Unit::GetNamedEntity(cls->getValStr()))
.immPtr(cls->getValStr())
.immPtr(cnsName->getValStr());
cgCallHelper(m_as, TCA(TargetCache::lookupClassConstantTv),
inst->getDst(), kSyncPoint, args, DestType::TV);
}
HOT_FUNC_VM
static inline int64_t ak_exist_string_helper(StringData* key, ArrayData* arr) {
int64_t n;
if (key->isStrictlyInteger(n)) {
return arr->exists(n);
}
return arr->exists(StrNR(key));
}
HOT_FUNC_VM
static int64_t ak_exist_string(StringData* key, ArrayData* arr) {
int64_t res = ak_exist_string_helper(key, arr);
return res;
}
HOT_FUNC_VM
static int64_t ak_exist_int(int64_t key, ArrayData* arr) {
bool res = arr->exists(key);
return res;
}
HOT_FUNC_VM
static int64_t ak_exist_string_obj(StringData* key, ObjectData* obj) {
CArrRef arr = obj->o_toArray();
int64_t res = ak_exist_string_helper(key, arr.get());
return res;
}
HOT_FUNC_VM
static int64_t ak_exist_int_obj(int64_t key, ObjectData* obj) {
CArrRef arr = obj->o_toArray();
bool res = arr.get()->exists(key);
return res;
}
void CodeGenerator::cgAKExists(IRInstruction* inst) {
SSATmp* arr = inst->getSrc(0);
SSATmp* key = inst->getSrc(1);
if (key->getType().isNull()) {
if (arr->isA(Type::Arr)) {
cgCallHelper(m_as,
(TCA)ak_exist_string,
inst->getDst(),
kNoSyncPoint,
ArgGroup().immPtr(empty_string.get()).ssa(arr));
} else {
m_as.mov_imm64_reg(0, inst->getDst()->getReg());
}
return;
}
TCA helper_func =
arr->isA(Type::Obj)
? (key->isA(Type::Int) ? (TCA)ak_exist_int_obj : (TCA)ak_exist_string_obj)
: (key->isA(Type::Int) ? (TCA)ak_exist_int : (TCA)ak_exist_string);
cgCallHelper(m_as,
helper_func,
inst->getDst(),
kNoSyncPoint,
ArgGroup().ssa(key).ssa(arr));
}
HOT_FUNC_VM static TypedValue* ldGblAddrHelper(StringData* name) {
return g_vmContext->m_globalVarEnv->lookup(name);
}
HOT_FUNC_VM static TypedValue* ldGblAddrDefHelper(StringData* name) {
TypedValue* r = g_vmContext->m_globalVarEnv->lookupAdd(name);
decRefStr(name);
return r;
}
void CodeGenerator::cgLdGblAddr(IRInstruction* inst) {
auto dstReg = inst->getDst()->getReg();
cgCallHelper(m_as, (TCA)ldGblAddrHelper, dstReg, kNoSyncPoint,
ArgGroup().ssa(inst->getSrc(0)));
m_as.testq(dstReg, dstReg);
emitFwdJcc(CC_Z, inst->getTaken());
}
void CodeGenerator::cgLdGblAddrDef(IRInstruction* inst) {
cgCallHelper(m_as, (TCA)ldGblAddrDefHelper, inst->getDst(), kNoSyncPoint,
ArgGroup().ssa(inst->getSrc(0)));
}
void CodeGenerator::cgJmpZeroHelper(IRInstruction* inst,
ConditionCode cc) {
SSATmp* src = inst->getSrc(0);
auto srcReg = src->getReg();
if (src->isConst()) {
bool valIsZero = src->getValRawInt() == 0;
if ((cc == CC_Z && valIsZero) ||
(cc == CC_NZ && !valIsZero)) {
// assert(false) here after new simplifier pass, t2019643
// For now, materialize the test condition and use a Jcc
m_as.xor_reg64_reg64(rScratch, rScratch);
m_as.test_reg64_reg64(rScratch, rScratch);
cc = CC_Z;
// Update the instr opcode since cgExitTrace uses it
// to determine correct cc for service request.
inst->setOpcode(JmpZero);
} else {
// Fall through to next bytecode, disable DirectJmp
inst->setTCA(kIRDirectJmpInactive);
return;
}
} else {
if (src->getType() == Type::Bool) {
m_as.testb(Reg8(int(srcReg)), Reg8(int(srcReg)));
} else {
m_as.test_reg64_reg64(srcReg, srcReg);
}
}
emitJccDirectExit(inst, cc);
}
void CodeGenerator::cgJmpZero(IRInstruction* inst) {
cgJmpZeroHelper(inst, CC_Z);
}
void CodeGenerator::cgJmpNZero(IRInstruction* inst) {
cgJmpZeroHelper(inst, CC_NZ);
}
void CodeGenerator::cgJmp_(IRInstruction* inst) {
assert(inst->getNumSrcs() == inst->getTaken()->getLabel()->getNumDsts());
if (unsigned n = inst->getNumSrcs()) {
// Parallel-copy sources to the label's destination registers.
// TODO: t2040286: this only works if all destinations fit in registers.
SrcRange srcs = inst->getSrcs();
DstRange dsts = inst->getTaken()->getLabel()->getDsts();
ArgGroup args;
for (unsigned i = 0, j = 0; i < n; i++) {
assert(srcs[i]->getType().subtypeOf(dsts[i].getType()));
SSATmp *dst = &dsts[i], *src = srcs[i];
if (dst->getReg(0) == InvalidReg) continue; // dst is unused.
// first dst register
args.ssa(src);
args[j++].setDstReg(dst->getReg(0));
// second dst register, if any
if (dst->numNeededRegs() == 2) {
if (src->numNeededRegs() < 2) {
// src has known data type, but dst doesn't - pass immediate type
assert(src->getType().isKnownDataType());
args.imm(src->getType().toDataType());
} else {
// pass src's second register
assert(src->getReg(1) != InvalidReg);
args.reg(src->getReg(1));
}
args[j++].setDstReg(dst->getReg(1));
}
}
shuffleArgs(m_as, args);
}
if (!m_state.noTerminalJmp_) {
emitFwdJmp(inst->getTaken());
}
}
void CodeGenerator::cgJmpIndirect(IRInstruction* inst) {
m_as.jmp(inst->getSrc(0)->getReg());
}
void CodeGenerator::cgCheckInit(IRInstruction* inst) {
Block* label = inst->getTaken();
assert(label);
SSATmp* src = inst->getSrc(0);
if (src->getType().isInit()) return;
auto typeReg = src->getReg(1);
assert(typeReg != InvalidReg);
static_assert(KindOfUninit == 0, "cgCheckInit assumes KindOfUninit == 0");
m_as.testl (r32(typeReg), r32(typeReg));
emitFwdJcc(CC_Z, label);
}
void CodeGenerator::cgCheckInitMem(IRInstruction* inst) {
Block* label = inst->getTaken();
assert(label);
SSATmp* base = inst->getSrc(0);
int64_t offset = inst->getSrc(1)->getValInt();
Type t = base->getType().deref();
if (t.isInit()) return;
m_as.cmpl (KindOfUninit, base->getReg()[offset + TVOFF(m_type)]);
emitFwdJcc(CC_Z, label);
}
void CodeGenerator::cgExitWhenSurprised(IRInstruction* inst) {
Block* label = inst->getTaken();
m_tx64->emitTestSurpriseFlags(m_as);
emitFwdJcc(CC_NZ, label);
}
void CodeGenerator::cgExitOnVarEnv(IRInstruction* inst) {
SSATmp* fp = inst->getSrc(0);
Block* label = inst->getTaken();
assert(!(fp->isConst()));
auto fpReg = fp->getReg();
m_as. cmpq (0, fpReg[AROFF(m_varEnv)]);
emitFwdJcc(CC_NE, label);
}
void CodeGenerator::cgReleaseVVOrExit(IRInstruction* inst) {
auto* const label = inst->getTaken();
auto const rFp = inst->getSrc(0)->getReg();
m_as. cmpq (0, rFp[AROFF(m_varEnv)]);
unlikelyIfBlock(CC_NZ, [&] {
m_astubs. testl (ActRec::kExtraArgsBit, rFp[AROFF(m_varEnv)]);
emitFwdJcc(m_astubs, CC_Z, label);
cgCallHelper(
m_astubs,
TCA(static_cast<void (*)(ActRec*)>(ExtraArgs::deallocate)),
nullptr,
kSyncPoint,
ArgGroup().reg(rFp),
DestType::None
);
});
}
void CodeGenerator::cgBoxPtr(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* addr = inst->getSrc(0);
auto base = addr->getReg();
auto dstReg = dst->getReg();
emitMovRegReg(m_as, base, dstReg);
ConditionCode cc = emitTypeTest(Type::BoxedCell, base[TVOFF(m_type)], true);
ifThen(m_as, cc, [&] {
cgCallHelper(m_as, (TCA)tvBox, dstReg, kNoSyncPoint, ArgGroup().ssa(addr));
});
}
void CodeGenerator::cgDefCns(IRInstruction* inst) {
UNUSED SSATmp* dst = inst->getDst();
UNUSED SSATmp* cnsName = inst->getSrc(0);
UNUSED SSATmp* val = inst->getSrc(1);
using namespace TargetCache;
UNUSED CacheHandle ch = allocConstant((StringData*)cnsName->getValStr());
#if 0
// ALIA:TODO
// XXX second param is an inout pointer to a Ref, so we need to pass
// the pointer to a stack slot
if (RuntimeOption::RepoAuthoritative) {
EMIT_CALL3(a, defCnsHelper<false>, IMM(ch), A(i.inputs[0]->location),
IMM((uint64_t)name));
} else {
EMIT_CALL4(a, defCnsHelper<true>, IMM(ch), A(i.inputs[0]->location),
IMM((uint64_t)name), IMM(allocCnsBit(name)));
}
#endif
CG_PUNT(DefCns);
}
// TODO: Kill this #2031980
static StringData* concat_value(TypedValue tv1, TypedValue tv2) {
return concat(tv1.m_type, tv1.m_data.num, tv2.m_type, tv2.m_data.num);
}
void CodeGenerator::cgConcat(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* tl = inst->getSrc(0);
SSATmp* tr = inst->getSrc(1);
Type lType = tl->getType();
Type rType = tr->getType();
// We have specialized helpers for concatenating two strings, a
// string and an int, and an int and a string.
void* fptr = nullptr;
if (lType.isString() && rType.isString()) {
fptr = (void*)concat_ss;
} else if (lType.isString() && rType == Type::Int) {
fptr = (void*)concat_si;
} else if (lType == Type::Int && rType.isString()) {
fptr = (void*)concat_is;
}
if (fptr) {
cgCallHelper(m_as, (TCA)fptr, dst, kNoSyncPoint,
ArgGroup().ssa(tl)
.ssa(tr));
} else {
if (lType.subtypeOf(Type::Obj) || lType.needsReg() ||
rType.subtypeOf(Type::Obj) || rType.needsReg()) {
CG_PUNT(cgConcat);
}
cgCallHelper(m_as, (TCA)concat_value, dst, kNoSyncPoint,
ArgGroup().typedValue(tl).typedValue(tr));
}
}
void CodeGenerator::cgDefCls(IRInstruction* inst) {
UNUSED SSATmp* dst = inst->getDst();
UNUSED SSATmp* preClass = inst->getSrc(0);
UNUSED SSATmp* opcodeAfter = inst->getSrc(1);
// XXX we need to compute the stack ptr to pass to the m_defClsHelper function
// in register rax
#if 0
// ALIA:TODO
/*
compute the corrected stack ptr as a pseudo-param to m_defClsHelper
which it will store in g_vmContext, in case of fatals, or __autoload
*/
a. lea_reg64_disp_reg64(rVmSp, -cellsToBytes(i.stackOff), rax);
EMIT_CALL2(a, m_tx64->m_defClsHelper, IMM((uint64_t)c), IMM((uint64_t)after));
#endif
CG_PUNT(DefCls);
}
void CodeGenerator::cgInterpOne(IRInstruction* inst) {
SSATmp* fp = inst->getSrc(0);
SSATmp* sp = inst->getSrc(1);
SSATmp* pcOffTmp = inst->getSrc(2);
SSATmp* spAdjustmentTmp = inst->getSrc(3);
Type resultType = inst->getTypeParam();
Block* label = inst->getTaken();
assert(pcOffTmp->isConst());
assert(spAdjustmentTmp->isConst());
assert(fp->getType() == Type::StkPtr);
assert(sp->getType() == Type::StkPtr);
int64_t pcOff = pcOffTmp->getValInt();
void* interpOneHelper =
interpOneEntryPoints[*(getCurFunc()->unit()->at(pcOff))];
auto dstReg = InvalidReg;
if (label) {
dstReg = rScratch;
}
cgCallHelper(m_as, (TCA)interpOneHelper, dstReg, kSyncPoint,
ArgGroup().ssa(fp).ssa(sp).imm(pcOff));
if (label) {
// compare the pc in the returned execution context with the
// bytecode offset of the label
Trace* targetTrace = label->getTrace();
assert(targetTrace);
uint32_t targetBcOff = targetTrace->getBcOff();
// compare the pc with the target bc offset
m_as.cmp_imm64_disp_reg64(targetBcOff,
offsetof(VMExecutionContext, m_pc),
dstReg);
// emitFwdJcc(CC_E, label);
}
auto newSpReg = inst->getDst()->getReg();
DEBUG_ONLY auto spReg = sp->getReg();
int64_t spAdjustment = spAdjustmentTmp->getValInt();
int64_t adjustment =
(spAdjustment - (resultType == Type::None ? 0 : 1)) * sizeof(Cell);
assert(newSpReg == spReg);
if (adjustment != 0) {
m_as.add_imm32_reg64(adjustment, newSpReg);
}
}
void CodeGenerator::cgDefFunc(IRInstruction* inst) {
SSATmp* dst = inst->getDst();
SSATmp* func = inst->getSrc(0);
cgCallHelper(m_as, (TCA)defFuncHelper, dst, kSyncPoint,
ArgGroup().ssa(func), DestType::None);
}
void CodeGenerator::cgFillContThis(IRInstruction* inst) {
SSATmp* cont = inst->getSrc(0);
auto baseReg = inst->getSrc(1)->getReg();
int64_t offset = inst->getSrc(2)->getValInt();
auto scratch = rScratch;
auto contReg = cont->getReg();
m_as.loadq(contReg[CONTOFF(m_obj)], scratch);
m_as.testq(scratch, scratch);
ifThen(m_as, CC_NZ, [&] {
m_as.addl(1, scratch[FAST_REFCOUNT_OFFSET]);
m_as.storeq(scratch, baseReg[offset + TVOFF(m_data)]);
emitStoreTVType(m_as, KindOfObject, baseReg[offset + TVOFF(m_type)]);
});
}
void CodeGenerator::cgContEnter(IRInstruction* inst) {
SSATmp* contAR = inst->getSrc(0);
SSATmp* addr = inst->getSrc(1);
SSATmp* returnOff = inst->getSrc(2);
auto contARReg = contAR->getReg();
m_as. storel (returnOff->getValInt(), contARReg[AROFF(m_soff)]);
m_as. storeq (rVmFp, contARReg[AROFF(m_savedRbp)]);
m_as. movq (contARReg, rStashedAR);
m_as. call (addr->getReg());
}
void CodeGenerator::emitContVarEnvHelperCall(SSATmp* fp, TCA helper) {
auto scratch = rScratch;
m_as. loadq (fp->getReg()[AROFF(m_varEnv)], scratch);
m_as. testq (scratch, scratch);
unlikelyIfBlock(CC_NZ, [&] {
cgCallHelper(m_astubs, helper, InvalidReg, kNoSyncPoint,
ArgGroup().ssa(fp));
});
}
void CodeGenerator::cgUnlinkContVarEnv(IRInstruction* inst) {
emitContVarEnvHelperCall(
inst->getSrc(0),
(TCA)VMExecutionContext::packContVarEnvLinkage);
}
void CodeGenerator::cgLinkContVarEnv(IRInstruction* inst) {
emitContVarEnvHelperCall(
inst->getSrc(0),
(TCA)VMExecutionContext::unpackContVarEnvLinkage);
}
void CodeGenerator::cgContRaiseCheck(IRInstruction* inst) {
SSATmp* cont = inst->getSrc(0);
m_as.test_imm32_disp_reg32(0x1, CONTOFF(m_should_throw),
cont->getReg());
emitFwdJcc(CC_NZ, inst->getTaken());
}
void CodeGenerator::cgContPreNext(IRInstruction* inst) {
auto contReg = inst->getSrc(0)->getReg();
const Offset doneOffset = CONTOFF(m_done);
static_assert((doneOffset + 1) == CONTOFF(m_running),
"m_done should immediately precede m_running");
// Check m_done and m_running at the same time
m_as.test_imm32_disp_reg32(0x0101, doneOffset, contReg);
emitFwdJcc(CC_NZ, inst->getTaken());
// ++m_index
m_as.add_imm64_disp_reg64(0x1, CONTOFF(m_index), contReg);
// m_running = true
m_as.store_imm8_disp_reg(0x1, CONTOFF(m_running), contReg);
}
void CodeGenerator::cgContStartedCheck(IRInstruction* inst) {
m_as.cmp_imm64_disp_reg64(0, CONTOFF(m_index),
inst->getSrc(0)->getReg());
emitFwdJcc(CC_L, inst->getTaken());
}
void CodeGenerator::cgIterNextK(IRInstruction* inst) {
cgIterNextCommon(inst, true);
}
void CodeGenerator::cgIterNext(IRInstruction* inst) {
cgIterNextCommon(inst, false);
}
void CodeGenerator::cgIterNextCommon(IRInstruction* inst, bool isNextK) {
PhysReg fpReg = inst->getSrc(0)->getReg();
ArgGroup args;
args.addr(fpReg, getIterOffset(inst->getSrc(1)))
.addr(fpReg, getLocalOffset(inst->getSrc(2)));
if (isNextK) {
args.addr(fpReg, getLocalOffset(inst->getSrc(3)));
}
TCA helperAddr = isNextK ? (TCA)iter_next_key : (TCA)iter_next;
cgCallHelper(m_as, helperAddr, inst->getDst(), kSyncPoint, args);
}
void CodeGenerator::cgIterInit(IRInstruction* inst) {
cgIterInitCommon(inst, false);
}
void iterFreeHelper(Iter* iter) {
iter->free();
}
void CodeGenerator::cgIterFree(IRInstruction* inst) {
PhysReg fpReg = inst->getSrc(0)->getReg();
int64_t offset = getIterOffset(inst->getSrc(1));
cgCallHelper(m_as, (TCA)iterFreeHelper, InvalidReg, kSyncPoint,
ArgGroup().addr(fpReg, offset));
}
void CodeGenerator::cgIterInitK(IRInstruction* inst) {
cgIterInitCommon(inst, true);
}
void CodeGenerator::cgIterInitCommon(IRInstruction* inst, bool isInitK) {
PhysReg fpReg = inst->getSrc(1)->getReg();
int64_t iterOffset = getIterOffset(inst->getSrc(2));
int64_t valLocalOffset = getLocalOffset(inst->getSrc(3));
SSATmp* src = inst->getSrc(0);
ArgGroup args;
args.addr(fpReg, iterOffset).ssa(src);
if (src->isArray()) {
args.addr(fpReg, valLocalOffset);
if (isInitK) {
args.addr(fpReg, getLocalOffset(inst->getSrc(4)));
}
TCA helperAddr = isInitK ? (TCA)new_iter_array_key : (TCA)new_iter_array;
cgCallHelper(m_as, helperAddr, inst->getDst(), kSyncPoint, args);
} else {
assert(src->getType() == Type::Obj);
args.imm(uintptr_t(getCurClass())).addr(fpReg, valLocalOffset);
if (isInitK) {
args.addr(fpReg, getLocalOffset(inst->getSrc(4)));
} else {
args.imm(0);
}
// new_iter_object decrefs its src object if it propagates an
// exception out, so we use kSyncPointAdjustOne, which adjusts the
// stack pointer by 1 stack element on an unwind, skipping over
// the src object.
cgCallHelper(m_as, (TCA)new_iter_object, inst->getDst(),
kSyncPointAdjustOne, args);
}
}
void CodeGenerator::cgIncStat(IRInstruction *inst) {
Stats::emitInc(m_as,
Stats::StatCounter(inst->getSrc(0)->getValInt()),
inst->getSrc(1)->getValInt(),
Transl::CC_None,
inst->getSrc(2)->getValBool());
}
void CodeGenerator::cgDbgAssertRefCount(IRInstruction* inst) {
emitAssertRefCount(m_as, inst->getSrc(0)->getReg());
}
void traceCallback(ActRec* fp, Cell* sp, int64_t pcOff, void* rip) {
#if 0
const Func* func = fp->m_func;
std::cout << func->fullName()->data()
<< " " << pcOff
<< " " << rip
<< std::endl;
#endif
checkFrame(fp, sp, true);
}
void CodeGenerator::emitTraceCall(CodeGenerator::Asm& as, int64_t pcOff,
Transl::TranslatorX64* tx64) {
// call to a trace function
as.mov_imm64_reg((int64_t)as.code.frontier, reg::rcx);
as.mov_reg64_reg64(rVmFp, reg::rdi);
as.mov_reg64_reg64(rVmSp, reg::rsi);
as.mov_imm64_reg(pcOff, reg::rdx);
// do the call; may use a trampoline
tx64->emitCall(as, (TCA)traceCallback);
}
void patchJumps(Asm& as, CodegenState& state, Block* block) {
void* list = state.patches[block];
Address labelAddr = as.code.frontier;
while (list) {
int32_t* toPatch = (int32_t*)list;
int32_t diffToNext = *toPatch;
ssize_t diff = labelAddr - ((Address)list + sizeof(int32_t));
*toPatch = safe_cast<int32_t>(diff); // patch the jump address
if (diffToNext == 0) break;
void* next = (TCA)list - diffToNext;
list = next;
}
}
void CodeGenerator::cgBlock(Block* block, vector<TransBCMapping>* bcMap) {
for (IRInstruction& instr : *block) {
IRInstruction* inst = &instr;
if (inst->getOpcode() == Marker) {
if (!m_state.firstMarkerSeen) {
m_state.firstMarkerSeen = true;
// This will be generated right after the tracelet guards
if (RuntimeOption::EvalJitTransCounters && m_tx64 &&
block->getTrace()->isMain()) {
m_tx64->emitTransCounterInc(m_as);
}
}
m_state.lastMarker = inst->getExtra<Marker>();
if (m_tx64 && m_tx64->isTransDBEnabled() && bcMap) {
bcMap->push_back((TransBCMapping){Offset(m_state.lastMarker->bcOff),
m_as.code.frontier,
m_astubs.code.frontier});
}
}
m_curInst = inst;
auto nuller = folly::makeGuard([&]{ m_curInst = nullptr; });
auto* addr = cgInst(inst);
if (m_state.asmInfo && addr) {
m_state.asmInfo->instRanges[inst] = TcaRange(addr, m_as.code.frontier);
}
}
}
void cgTrace(Trace* trace, Asm& amain, Asm& astubs, Transl::TranslatorX64* tx64,
vector<TransBCMapping>* bcMap, CodegenState& state) {
state.firstMarkerSeen = false;
state.lastMarker = nullptr;
TCA traceStart = amain.code.frontier;
if (RuntimeOption::EvalHHIRGenerateAsserts && trace->isMain()) {
CodeGenerator::emitTraceCall(amain, trace->getBcOff(), tx64);
}
auto chooseAs = [&](Block* b) {
return b->getHint() != Block::Unlikely ? &amain : &astubs;
};
auto& blocks = trace->getBlocks();
for (auto it = blocks.begin(), end = blocks.end(); it != end;) {
Block* block = *it; ++it;
Asm* as = chooseAs(block);
TCA asmStart = as->code.frontier;
TCA astubsStart = astubs.code.frontier;
patchJumps(*as, state, block);
// If the block ends with a Jmp_ to the next block we're translating into
// the same assembler, it doesn't need to actually emit a jmp.
state.noTerminalJmp_ = false;
IRInstruction* last = block->back();
if (last->getOpcode() == Jmp_) {
for (auto next = it; next != end; ++next) {
if (chooseAs(*next) == as) {
state.noTerminalJmp_ = last->getTaken() == *next;
break;
}
}
}
CodeGenerator cg(trace, *as, astubs, tx64, state);
cg.cgBlock(block, bcMap);
if (Block* next = block->getNext()) {
// if there's a fallthrough block and it's not the next thing going
// into this assembler, then emit a jump to it.
if (it == end || next != *it || as != chooseAs(next)) {
CodeGenerator::emitFwdJmp(*as, next, state);
}
}
if (state.asmInfo) {
state.asmInfo->asmRanges[block] = TcaRange(asmStart, as->code.frontier);
if (as != &astubs) {
state.asmInfo->astubRanges[block] = TcaRange(astubsStart,
astubs.code.frontier);
}
}
}
size_t UNUSED traceSize = amain.code.frontier - traceStart;
TRACE(3, "[counter] %lu bytes of code generated\n", traceSize);
if (trace->isMain()) {
TRACE(3, "[counter] %lu bytes of code generated in main traces\n",
traceSize);
}
}
// select instructions for the trace and its exits
void genCodeForTrace(Trace* trace,
CodeGenerator::Asm& as,
CodeGenerator::Asm& astubs,
IRFactory* irFactory,
vector<TransBCMapping>* bcMap,
Transl::TranslatorX64* tx64,
AsmInfo* asmInfo) {
assert(trace->isMain());
CodegenState state(irFactory, asmInfo);
cgTrace(trace, as, astubs, tx64, bcMap, state);
for (Trace* exit : trace->getExitTraces()) {
cgTrace(exit, astubs, astubs, tx64, nullptr, state);
}
}
}}}
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