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dc6dc022e740cb81d06c92aa89da54a90721097b
hhvm/hphp/runtime/vm/hhbc.cpp
T
Jordan DeLong dc6dc022e7 Initial API for region selectors 
Contains some structures to use for communicating between
compilation region selectors and the JIT.  For now includes two
debugging-oriented region selectors, one that uses a single HHBC
opcode at a time, and one that blindly pushes in the whole CFG for a
method using the Verifier::GraphBuilder.
2013-06-06 15:58:14 -07:00

1031 linhas
30 KiB
C++
Original Anotar Histórico

/*
+----------------------------------------------------------------------+
| HipHop for PHP |
+----------------------------------------------------------------------+
| Copyright (c) 2010-2013 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 "hphp/runtime/vm/hhbc.h"
#include "hphp/runtime/ext/ext_variable.h"
#include "hphp/runtime/vm/unit.h"
#include "hphp/runtime/base/stats.h"
#include <sstream>
namespace HPHP {
///////////////////////////////////////////////////////////////////////////////
bool isValidOpcode(Opcode op) {
return op > OpLowInvalid && op < OpHighInvalid;
}
int numImmediates(Opcode opcode) {
assert(isValidOpcode(opcode));
static const int8_t values[] = {
#define NA 0
#define ONE(...) 1
#define TWO(...) 2
#define THREE(...) 3
#define FOUR(...) 4
#define O(name, imm, unusedPop, unusedPush, unusedFlags) imm,
OPCODES
#undef O
#undef NA
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
};
return values[opcode];
}
ArgType immType(const Opcode opcode, int idx) {
assert(isValidOpcode(opcode));
assert(idx >= 0 && idx < numImmediates(opcode));
always_assert(idx < 4); // No opcodes have more than four immediates
static const int8_t arg0Types[] = {
#define NA -1,
#define ONE(a) a,
#define TWO(a, b) a,
#define THREE(a, b, c) a,
#define FOUR(a, b, c, d) a,
#define O(name, imm, unusedPop, unusedPush, unusedFlags) imm
OPCODES
// re-using definition of O below.
#undef NA
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
};
static const int8_t arg1Types[] = {
#define NA -1,
#define ONE(a) -1,
#define TWO(a, b) b,
#define THREE(a, b, c) b,
#define FOUR(a, b, c, d) b,
OPCODES
// re-using definition of O below.
#undef NA
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
};
static const int8_t arg2Types[] = {
#define NA -1,
#define ONE(a) -1,
#define TWO(a, b) -1,
#define THREE(a, b, c) c,
#define FOUR(a, b, c, d) c,
OPCODES
#undef NA
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
};
static const int8_t arg3Types[] = {
#define NA -1,
#define ONE(a) -1,
#define TWO(a, b) -1,
#define THREE(a, b, c) -1,
#define FOUR(a, b, c, d) d,
OPCODES
#undef O
#undef NA
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
};
switch (idx) {
case 0: return (ArgType)arg0Types[opcode];
case 1: return (ArgType)arg1Types[opcode];
case 2: return (ArgType)arg2Types[opcode];
case 3: return (ArgType)arg3Types[opcode];
default: assert(false); return (ArgType)-1;
}
}
int immSize(const Opcode* opcode, int idx) {
assert(idx >= 0 && idx < numImmediates(*opcode));
always_assert(idx < 4); // No opcodes have more than four immediates
static const int8_t argTypeToSizes[] = {
#define ARGTYPE(nm, type) sizeof(type),
#define ARGTYPEVEC(nm, type) 0,
ARGTYPES
#undef ARGTYPE
#undef ARGTYPEVEC
};
if (immType(*opcode, idx) == IVA || immType(*opcode, idx) == HA ||
immType(*opcode, idx) == IA) {
intptr_t offset = 1;
if (idx >= 1) offset += immSize(opcode, 0);
if (idx >= 2) offset += immSize(opcode, 1);
if (idx >= 3) offset += immSize(opcode, 2);
// variable size
unsigned char imm = *(unsigned char*)(opcode + offset);
// Low order bit set => 4-byte.
return (imm & 0x1 ? sizeof(int32_t) : sizeof(unsigned char));
} else if (immIsVector(*opcode, idx)) {
intptr_t offset = 1;
if (idx >= 1) offset += immSize(opcode, 0);
if (idx >= 2) offset += immSize(opcode, 1);
if (idx >= 3) offset += immSize(opcode, 2);
int prefixes, vecElemSz;
auto itype = immType(*opcode, idx);
if (itype == MA) {
prefixes = 2;
vecElemSz = sizeof(uint8_t);
} else if (itype == BLA) {
prefixes = 1;
vecElemSz = sizeof(Offset);
} else {
assert(itype == SLA);
prefixes = 1;
vecElemSz = sizeof(StrVecItem);
}
return prefixes * sizeof(int32_t) +
vecElemSz * *(int32_t*)((int8_t*)opcode + offset);
} else {
ArgType type = immType(*opcode, idx);
return (type >= 0) ? argTypeToSizes[type] : 0;
}
}
bool immIsVector(Opcode opcode, int idx) {
ArgType type = immType(opcode, idx);
return (type == MA || type == BLA || type == SLA);
}
bool hasImmVector(Opcode opcode) {
const int num = numImmediates(opcode);
for (int i = 0; i < num; ++i) {
if (immIsVector(opcode, i)) return true;
}
return false;
}
ArgUnion getImm(const Opcode* opcode, int idx) {
const Opcode* p = opcode + 1;
assert(idx >= 0 && idx < numImmediates(*opcode));
ArgUnion retval;
retval.u_NA = 0;
int cursor = 0;
for (cursor = 0; cursor < idx; cursor++) {
// Advance over this immediate.
p += immSize(opcode, cursor);
}
always_assert(cursor == idx);
ArgType type = immType(*opcode, idx);
if (type == IVA || type == HA || type == IA) {
retval.u_IVA = decodeVariableSizeImm(&p);
} else if (!immIsVector(*opcode, cursor)) {
memcpy(&retval.bytes, p, immSize(opcode, idx));
}
always_assert(numImmediates(*opcode) > idx);
return retval;
}
ArgUnion* getImmPtr(const Opcode* opcode, int idx) {
assert(immType(*opcode, idx) != IVA);
assert(immType(*opcode, idx) != HA);
assert(immType(*opcode, idx) != IA);
const Opcode* ptr = opcode + 1;
for (int i = 0; i < idx; i++) {
ptr += immSize(opcode, i);
}
return (ArgUnion*)ptr;
}
template<typename T>
T decodeImm(const unsigned char** immPtr) {
T val = *(T*)*immPtr;
*immPtr += sizeof(T);
return val;
}
int64_t decodeMemberCodeImm(const unsigned char** immPtr, MemberCode mcode) {
switch (mcode) {
case MEL:
case MPL:
return decodeVariableSizeImm(immPtr);
case MET:
case MPT:
return decodeImm<int32_t>(immPtr);
case MEI:
return decodeImm<int64_t>(immPtr);
default:
not_reached();
}
}
// TODO: merge with emitIVA in unit.h
size_t encodeVariableSizeImm(int32_t n, unsigned char* buf) {
if (LIKELY((n & 0x7f) == n)) {
*buf = static_cast<unsigned char>(n) << 1;
return 1;
}
assert((n & 0x7fffffff) == n);
*reinterpret_cast<uint32_t*>(buf) = (uint32_t(n) << 1) | 0x1;
return 4;
}
void encodeIvaToVector(std::vector<uchar>& out, int32_t val) {
size_t currentLen = out.size();
out.resize(currentLen + 4);
out.resize(currentLen + encodeVariableSizeImm(val, &out[currentLen]));
}
int instrLen(const Opcode* opcode) {
int len = 1;
int nImm = numImmediates(*opcode);
for (int i = 0; i < nImm; i++) {
len += immSize(opcode, i);
}
return len;
}
InstrFlags instrFlags(Opcode opcode) {
static const InstrFlags instrFlagsData[] = {
#define O(unusedName, unusedImm, unusedPop, unusedPush, flags) flags,
OPCODES
#undef O
};
return instrFlagsData[opcode];
}
Offset* instrJumpOffset(Opcode* instr) {
static const int8_t jumpMask[] = {
#define NA 0
#define MA 0
#define IVA 0
#define I64A 0
#define DA 0
#define SA 0
#define AA 0
#define BA 1
#define HA 0
#define IA 0
#define OA 0
#define ONE(a) a
#define TWO(a, b) (a + 2 * b)
#define THREE(a, b, c) (a + 2 * b + 4 * c)
#define FOUR(a, b, c, d) (a + 2 * b + 4 * c + 8 * d)
#define O(name, imm, pop, push, flags) imm,
OPCODES
#undef NA
#undef MA
#undef IVA
#undef I64A
#undef DA
#undef SA
#undef AA
#undef HA
#undef IA
#undef BA
#undef OA
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
#undef O
};
assert(!isSwitch(*instr));
int mask = jumpMask[*instr];
if (mask == 0) {
return nullptr;
}
int immNum;
switch (mask) {
case 0: return nullptr;
case 1: immNum = 0; break;
case 2: immNum = 1; break;
case 4: immNum = 2; break;
case 8: immNum = 3; break;
default: assert(false); return nullptr;
}
return &getImmPtr(instr, immNum)->u_BA;
}
Offset instrJumpTarget(const Opcode* instrs, Offset pos) {
Offset* offset = instrJumpOffset(const_cast<Opcode*>(instrs + pos));
if (!offset) {
return InvalidAbsoluteOffset;
} else {
return *offset + pos;
}
}
/**
* Return the number of successor-edges including fall-through paths but not
* implicit exception paths.
*/
int numSuccs(const Opcode* instr) {
if (!instrIsControlFlow(*instr)) return 1;
if ((instrFlags(*instr) & TF) != 0) {
if (isSwitch(*instr)) {
return *(int*)(instr + 1);
}
if (Op(*instr) == OpJmp) return 1;
return 0;
}
if (instrJumpOffset(const_cast<Opcode*>(instr))) return 2;
return 1;
}
/**
* instrNumPops() returns the number of values consumed from the stack
* for a given push/pop instruction. For peek/poke instructions, this
* function returns 0.
*/
int instrNumPops(const Opcode* opcode) {
static const int8_t numberOfPops[] = {
#define NOV 0
#define ONE(...) 1
#define TWO(...) 2
#define THREE(...) 3
#define FOUR(...) 4
#define LMANY(...) -1
#define C_LMANY(...) -2
#define V_LMANY(...) -2
#define R_LMANY(...) -2
#define FMANY -3
#define CVMANY -3
#define CMANY -3
#define O(name, imm, pop, push, flags) pop,
OPCODES
#undef NOV
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
#undef LMANY
#undef C_LMANY
#undef V_LMANY
#undef R_LMANY
#undef FMANY
#undef CVMANY
#undef CMANY
#undef O
};
int n = numberOfPops[*opcode];
// For most instructions, we know how many values are popped based
// solely on the opcode
if (n >= 0) return n;
// FCall and NewTuple specify how many values are popped in their
// first immediate
if (n == -3) return getImm(opcode, 0).u_IVA;
// For instructions with vector immediates, we have to scan the
// contents of the vector immediate to determine how many values
// are popped
assert(n == -1 || n == -2);
ImmVector iv = getImmVector(opcode);
// Count the number of values on the stack accounted for by the
// ImmVector's location and members
int k = iv.numStackValues();
// If this instruction also takes a RHS, count that too
if (n == -2) ++k;
return k;
}
/**
* instrNumPushes() returns the number of values pushed onto the stack
* for a given push/pop instruction. For peek/poke instructions or
* InsertMid instructions, this function returns 0.
*/
int instrNumPushes(const Opcode* opcode) {
static const int8_t numberOfPushes[] = {
#define NOV 0
#define ONE(...) 1
#define TWO(...) 2
#define THREE(...) 3
#define FOUR(...) 4
#define INS_1(...) 0
#define INS_2(...) 0
#define O(name, imm, pop, push, flags) push,
OPCODES
#undef NOV
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
#undef INS_1
#undef INS_2
#undef O
};
return numberOfPushes[*opcode];
}
StackTransInfo instrStackTransInfo(const Opcode* opcode) {
static const StackTransInfo::Kind transKind[] = {
#define NOV StackTransInfo::PushPop
#define ONE(...) StackTransInfo::PushPop
#define TWO(...) StackTransInfo::PushPop
#define THREE(...) StackTransInfo::PushPop
#define FOUR(...) StackTransInfo::PushPop
#define INS_1(...) StackTransInfo::InsertMid
#define INS_2(...) StackTransInfo::InsertMid
#define O(name, imm, pop, push, flags) push,
OPCODES
#undef NOV
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
#undef INS_1
#undef INS_2
#undef O
};
static const int8_t peekPokeType[] = {
#define NOV -1
#define ONE(...) -1
#define TWO(...) -1
#define THREE(...) -1
#define FOUR(...) -1
#define INS_1(...) 0
#define INS_2(...) 1
#define O(name, imm, pop, push, flags) push,
OPCODES
#undef NOV
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
#undef INS_2
#undef INS_1
#undef O
};
StackTransInfo ret;
ret.kind = transKind[*opcode];
switch (ret.kind) {
case StackTransInfo::PushPop:
ret.pos = 0;
ret.numPushes = instrNumPushes(opcode);
ret.numPops = instrNumPops(opcode);
return ret;
case StackTransInfo::InsertMid:
ret.numPops = 0;
ret.numPushes = 0;
ret.pos = peekPokeType[*opcode];
return ret;
default:
NOT_REACHED();
}
}
bool pushesActRec(Opcode opcode) {
switch (opcode) {
case OpFPushFunc:
case OpFPushFuncD:
case OpFPushFuncU:
case OpFPushObjMethod:
case OpFPushObjMethodD:
case OpFPushClsMethod:
case OpFPushClsMethodF:
case OpFPushClsMethodD:
case OpFPushCtor:
case OpFPushCtorD:
case OpFPushCufIter:
case OpFPushCuf:
case OpFPushCufF:
case OpFPushCufSafe:
return true;
default:
return false;
}
}
static void staticArrayStreamer(ArrayData* ad, std::stringstream& out) {
out << "array(";
if (!ad->empty()) {
bool comma = false;
for (ArrayIter it(ad); !it.end(); it.next()) {
if (comma) {
out << ",";
} else {
comma = true;
}
Variant key = it.first();
// Key.
switch (key.getType()) {
case KindOfInt64: {
out << *key.getInt64Data();
break;
}
case KindOfStaticString:
case KindOfString: {
out << "\""
<< Util::escapeStringForCPP(key.getStringData()->data(),
key.getStringData()->size())
<< "\"";
break;
}
default: assert(false);
}
out << "=>";
// Value.
Variant val = it.second();
switch (val.getType()) {
case KindOfUninit:
case KindOfNull: {
out << "null";
break;
}
case KindOfBoolean: {
out << (val.toBoolean() ? "true" : "false");
break;
}
case KindOfStaticString:
case KindOfString: {
out << "\""
<< Util::escapeStringForCPP(val.getStringData()->data(),
val.getStringData()->size())
<< "\"";
break;
}
case KindOfInt64: {
out << *val.getInt64Data();
break;
}
case KindOfDouble: {
out << *val.getDoubleData();
break;
}
case KindOfArray: {
staticArrayStreamer(val.getArrayData(), out);
break;
}
default: assert(false);
}
}
}
out << ")";
}
void staticStreamer(const TypedValue* tv, std::stringstream& out) {
switch (tv->m_type) {
case KindOfUninit:
case KindOfNull: {
out << "null";
break;
}
case KindOfBoolean: {
out << (tv->m_data.num ? "true" : "false");
break;
}
case KindOfStaticString:
case KindOfString: {
out << "\"" << tv->m_data.pstr->data() << "\"";
break;
}
case KindOfInt64: {
out << tv->m_data.num;
break;
}
case KindOfDouble: {
out << tv->m_data.dbl;
break;
}
case KindOfArray: {
staticArrayStreamer(tv->m_data.parr, out);
break;
}
default: assert(false);
}
}
const char* const locationNames[] = { "L", "C", "H",
"GL", "GC",
"NL", "NC",
"SL", "SC",
"R" };
const size_t locationNamesCount = sizeof(locationNames) /
sizeof(*locationNames);
static_assert(locationNamesCount == NumLocationCodes,
"Location code missing for locationCodeString");
const char* locationCodeString(LocationCode lcode) {
assert(lcode >= 0 && lcode < NumLocationCodes);
return locationNames[lcode];
}
LocationCode parseLocationCode(const char* s) {
if (!*s) return InvalidLocationCode;
switch (*s) {
case 'L': return LL;
case 'C': return LC;
case 'H': return LH;
case 'R': return LR;
default:
int incr = (s[1] == 'C');
switch (*s) {
case 'G': return LocationCode(LGL + incr);
case 'N': return LocationCode(LNL + incr);
case 'S': return LocationCode(LSL + incr);
}
return InvalidLocationCode;
}
}
const char* const memberNames[] =
{ "EC", "PC", "EL", "PL", "ET", "PT", "EI", "W" };
const size_t memberNamesCount = sizeof(memberNames) /
sizeof(*memberNames);
static_assert(memberNamesCount == NumMemberCodes,
"Member code missing for memberCodeString");
const char* memberCodeString(MemberCode mcode) {
assert(mcode >= 0 && mcode < NumMemberCodes);
return memberNames[mcode];
}
MemberCode parseMemberCode(const char* s) {
int incr;
switch (*s) {
case 'W': return MW;
case 'E': incr = 0; break;
case 'P': incr = 1; break;
default: return InvalidMemberCode;
}
switch (s[1]) {
case 'C': return MemberCode(MEC + incr);
case 'L': return MemberCode(MEL + incr);
case 'T': return MemberCode(MET + incr);
case 'I': return incr ? InvalidMemberCode : MEI;
default: return InvalidMemberCode;
}
}
std::string instrToString(const Opcode* it, const Unit* u /* = NULL */) {
// IncDec names
static const char* incdecNames[] = {
"PreInc", "PostInc", "PreDec", "PostDec"
};
static const int incdecNamesCount =
(int)(sizeof(incdecNames)/sizeof(const char*));
// SetOp names
static const char* setopNames[] = {
#define SETOP_OP(setOpOp, bcOp) #bcOp,
SETOP_OPS
#undef SETOP_OP
};
static const int setopNamesCount =
(int)(sizeof(setopNames)/sizeof(const char*));
std::stringstream out;
const Opcode* iStart = it;
Op op = (Op)*it;
++it;
switch (op) {
#define READ(t) out << " " << *((t*)&*it); it += sizeof(t)
#define READOFF() do { \
Offset _value = *(Offset*)it; \
out << " " << _value; \
if (u != nullptr && _value >= 0) { \
out << " (" << u->offsetOf(iStart + _value) << ")"; \
} \
it += sizeof(Offset); \
} while (false)
#define READV() out << " " << decodeVariableSizeImm(&it);
#define READIVA() do { \
out << " "; \
auto imm = decodeVariableSizeImm(&it); \
if (op == OpIncStat && immIdx == 0) { \
out << Stats::g_counterNames[imm]; \
} else { \
out << imm; \
} \
immIdx++; \
} while (false)
#define READOA() do { \
int immVal = (int)*((uchar*)&*it); \
it += sizeof(uchar); \
out << " "; \
switch (op) { \
case OpIncDecL: case OpIncDecN: case OpIncDecG: case OpIncDecS: \
case OpIncDecM: \
out << ((immVal >= 0 && immVal < incdecNamesCount) ? \
incdecNames[immVal] : "?"); \
break; \
case OpSetOpL: case OpSetOpN: case OpSetOpG: case OpSetOpS: \
case OpSetOpM: \
out << ((immVal >=0 && immVal < setopNamesCount) ? \
setopNames[immVal] : "?"); \
break; \
default: \
out << immVal; \
break; \
} \
} while (false)
#define READVEC() do { \
int sz = *((int*)&*it); \
it += sizeof(int) * 2; \
const uint8_t* const start = it; \
out << " <"; \
if (sz > 0) { \
int immVal = (int)*((uchar*)&*it); \
out << ((immVal >=0 && size_t(immVal) < locationNamesCount) ? \
locationCodeString(LocationCode(immVal)) : "?"); \
it += sizeof(uchar); \
int numLocImms = numLocationCodeImms(LocationCode(immVal)); \
for (int i = 0; i < numLocImms; ++i) { \
out << ':' << decodeVariableSizeImm(&it); \
} \
while (reinterpret_cast<const uint8_t*>(it) - start < sz) { \
immVal = (int)*((uchar*)&*it); \
out << " " << ((immVal >=0 && size_t(immVal) < memberNamesCount) ? \
memberCodeString(MemberCode(immVal)) : "?"); \
it += sizeof(uchar); \
if (memberCodeHasImm(MemberCode(immVal))) { \
int64_t imm = decodeMemberCodeImm(&it, MemberCode(immVal)); \
out << ':'; \
if (memberCodeImmIsString(MemberCode(immVal)) && u) { \
const StringData* str = u->lookupLitstrId(imm); \
int len = str->size(); \
char* escaped = string_addslashes(str->data(), len); \
out << '"' << escaped << '"'; \
free(escaped); \
} else { \
out << imm; \
} \
} \
} \
assert(reinterpret_cast<const uint8_t*>(it) - start == sz); \
} \
out << ">"; \
} while (false)
#define READLITSTR(sep) do { \
Id id = readData<Id>(it); \
if (id < 0) { \
assert(op == OpSSwitch); \
out << sep << "-"; \
} else if (u) { \
const StringData* sd = u->lookupLitstrId(id); \
out << sep << "\"" << \
Util::escapeStringForCPP(sd->data(), sd->size()) << "\""; \
} else { \
out << sep << id; \
} \
} while (false)
#define READSVEC() do { \
int sz = readData<int>(it); \
out << " <"; \
const char* sep = ""; \
for (int i = 0; i < sz; ++i) { \
out << sep; \
if (op == OpSSwitch) { \
READLITSTR(""); \
out << ":"; \
} \
Offset o = readData<Offset>(it); \
if (u != nullptr) { \
if (iStart + o == u->entry() - 1) { \
out << "Invalid"; \
} else { \
out << u->offsetOf(iStart + o); \
} \
} else { \
out << o; \
} \
sep = " "; \
} \
out << ">"; \
} while (false)
#define ONE(a) H_##a
#define TWO(a, b) H_##a; H_##b
#define THREE(a, b, c) H_##a; H_##b; H_##c;
#define FOUR(a, b, c, d) H_##a; H_##b; H_##c; H_##d;
#define NA
#define H_MA READVEC()
#define H_BLA READSVEC()
#define H_SLA READSVEC()
#define H_IVA READIVA()
#define H_I64A READ(int64_t)
#define H_HA READV()
#define H_IA READV()
#define H_DA READ(double)
#define H_BA READOFF()
#define H_OA READOA()
#define H_SA READLITSTR(" ")
#define H_AA \
if (u) { \
out << " "; \
staticArrayStreamer(u->lookupArrayId(*((Id*)it)), out); \
} else { \
out << " " << *((Id*)it); \
} \
it += sizeof(Id)
#define O(name, imm, push, pop, flags) \
case Op##name: { \
out << #name; \
UNUSED unsigned immIdx = 0; \
imm; \
break; \
}
OPCODES
#undef O
#undef READ
#undef ONE
#undef TWO
#undef THREE
#undef FOUR
#undef NA
#undef H_MA
#undef H_BLA
#undef H_SLA
#undef H_IVA
#undef H_I64A
#undef H_HA
#undef H_IA
#undef H_DA
#undef H_BA
#undef H_OA
#undef H_SA
#undef H_AA
default: assert(false);
};
return out.str();
}
const char* opcodeToName(Opcode op) {
const char* namesArr[] = {
#define O(name, imm, inputs, outputs, flags) \
#name ,
OPCODES
#undef O
"Invalid"
};
if (op >= 0 && op < sizeof namesArr / sizeof *namesArr) {
return namesArr[op];
}
return "Invalid";
}
bool instrIsControlFlow(Opcode opcode) {
InstrFlags opFlags = instrFlags(opcode);
return (opFlags & CF) != 0;
}
bool instrIsNonCallControlFlow(Opcode opcode) {
return
instrIsControlFlow(opcode) &&
!isFCallStar(opcode) &&
opcode != OpContEnter &&
opcode != OpFCallBuiltin;
}
bool instrAllowsFallThru(Opcode opcode) {
InstrFlags opFlags = instrFlags(opcode);
return (opFlags & TF) == 0;
}
bool instrReadsCurrentFpi(Opcode opcode) {
InstrFlags opFlags = instrFlags(opcode);
return (opFlags & FF) != 0;
}
ImmVector getImmVector(const Opcode* opcode) {
int numImm = numImmediates(*opcode);
for (int k = 0; k < numImm; ++k) {
ArgType t = immType(*opcode, k);
if (t == MA) {
void* vp = getImmPtr(opcode, k);
return ImmVector::createFromStream(
static_cast<const uint8_t*>(vp));
} else if (t == BLA || t == SLA) {
void* vp = getImmPtr(opcode, k);
return ImmVector::createFromStream(
static_cast<const int32_t*>(vp));
}
}
NOT_REACHED();
}
const uint8_t* ImmVector::findLastMember() const {
assert(m_length > 0);
// Loop that does basically the same as numStackValues(), except
// stop at the last.
const uint8_t* vec = m_start;
const LocationCode locCode = LocationCode(*vec++);
const int numLocImms = numLocationCodeImms(locCode);
for (int i = 0; i < numLocImms; ++i) {
decodeVariableSizeImm(&vec);
}
for (;;) {
const uint8_t* ret = vec;
MemberCode code = MemberCode(*vec++);
if (memberCodeHasImm(code)) {
decodeMemberCodeImm(&vec, code);
}
if (vec - m_start == m_length) {
return ret;
}
assert(vec - m_start < m_length);
}
NOT_REACHED();
}
bool ImmVector::decodeLastMember(const Unit* u,
StringData*& sdOut,
MemberCode& membOut,
int64_t* strIdOut /*=NULL*/) const {
const uint8_t* vec = findLastMember();
membOut = MemberCode(*vec++);
if (memberCodeImmIsString(membOut)) {
int64_t strId = decodeMemberCodeImm(&vec, membOut);
if (strIdOut) *strIdOut = strId;
sdOut = u->lookupLitstrId(strId);
return true;
}
return false;
}
int instrSpToArDelta(const Opcode* opcode) {
// This function should only be called for instructions that read
// the current FPI
assert(instrReadsCurrentFpi(*opcode));
// The delta from sp to ar is equal to the number of values on the stack
// that will be consumed by this instruction (numPops) plus the number of
// parameters pushed onto the stack so far that are not being consumed by
// this instruction (numExtra). For the FPass* instructions, numExtra will
// be equal to the first immediate argument (param id). For the FCall
// instructions, numExtra will be 0 because all of the parameters on the
// stack are already accounted for by numPops.
int numPops = instrNumPops(opcode);
int numExtra = isFCallStar(*opcode) ? 0 : getImm(opcode, 0).u_IVA;
int delta = numPops + numExtra;
return delta;
}
const MInstrInfo& getMInstrInfo(Op op) {
static const MInstrInfo mInstrInfo[] = {
#define MII(instr, attrs, bS, iS, vC, fN) \
{MI_##instr##M, \
{MIA_none, MIA_none, MInstrAttr((attrs) & MIA_base), \
MInstrAttr((attrs) & MIA_base), MInstrAttr((attrs) & MIA_base), \
MInstrAttr((attrs) & MIA_base), MInstrAttr((attrs) & MIA_base), \
MIA_none, \
MIA_none}, \
{MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_intermediate), \
MInstrAttr((attrs) & MIA_final)}, \
unsigned(vC), bool((attrs) & MIA_new), bool((attrs) & MIA_final_get), \
#instr},
MINSTRS
#undef MII
};
switch (op) {
#define MII(instr_, attrs, bS, iS, vC, fN) \
case Op##instr_##M: { \
const MInstrInfo& mii = mInstrInfo[MI_##instr_##M]; \
assert(mii.instr() == MI_##instr_##M); \
return mii; \
}
MINSTRS
#undef MII
default: not_reached();
}
}
///////////////////////////////////////////////////////////////////////////////
}
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