Tim Starling
448 linhas
15 KiB
C++
448 linhas
15 KiB
C++
/*
|
|
+----------------------------------------------------------------------+
|
|
| 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/compiler/statement/statement_list.h"
|
|
#include "hphp/compiler/analysis/analysis_result.h"
|
|
#include "hphp/compiler/analysis/function_scope.h"
|
|
#include "hphp/compiler/analysis/file_scope.h"
|
|
#include "hphp/compiler/analysis/class_scope.h"
|
|
#include "hphp/compiler/analysis/code_error.h"
|
|
#include "hphp/compiler/statement/exp_statement.h"
|
|
#include "hphp/compiler/statement/method_statement.h"
|
|
#include "hphp/compiler/statement/class_statement.h"
|
|
#include "hphp/compiler/statement/function_statement.h"
|
|
#include "hphp/compiler/statement/return_statement.h"
|
|
#include "hphp/compiler/statement/block_statement.h"
|
|
#include "hphp/util/parser/hphp.tab.hpp"
|
|
#include "hphp/compiler/expression/binary_op_expression.h"
|
|
#include "hphp/compiler/expression/assignment_expression.h"
|
|
#include "hphp/compiler/expression/simple_variable.h"
|
|
#include "hphp/compiler/expression/constant_expression.h"
|
|
#include "hphp/compiler/expression/unary_op_expression.h"
|
|
#include "hphp/compiler/expression/include_expression.h"
|
|
#include "hphp/compiler/expression/simple_function_call.h"
|
|
|
|
using namespace HPHP;
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// constructors/destructors
|
|
|
|
StatementList::StatementList
|
|
(STATEMENT_CONSTRUCTOR_PARAMETERS)
|
|
: Statement(STATEMENT_CONSTRUCTOR_PARAMETER_VALUES(StatementList)),
|
|
m_included(false) {
|
|
}
|
|
|
|
StatementPtr StatementList::clone() {
|
|
StatementListPtr stmt(new StatementList(*this));
|
|
stmt->m_stmts.clear();
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
stmt->m_stmts.push_back(Clone(m_stmts[i]));
|
|
}
|
|
return stmt;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// parser functions
|
|
|
|
void StatementList::addElement(StatementPtr stmt) {
|
|
m_stmts.push_back(stmt);
|
|
}
|
|
|
|
void StatementList::insertElement(StatementPtr stmt, int index /* = 0 */) {
|
|
assert(index >= 0 && index <= (int)m_stmts.size());
|
|
m_stmts.insert(m_stmts.begin() + index, stmt);
|
|
}
|
|
|
|
void StatementList::removeElement(int index) {
|
|
m_stmts.erase(m_stmts.begin() + index, m_stmts.begin() + index + 1);
|
|
}
|
|
|
|
void StatementList::shift(int from, int to) {
|
|
assert(from >= 0 && from <= (int)m_stmts.size());
|
|
assert(to >= 0 && to <= (int)m_stmts.size());
|
|
StatementPtr stmt = m_stmts[from];
|
|
for (int i = from; i < to; i++) {
|
|
m_stmts[i] = m_stmts[i+1];
|
|
}
|
|
m_stmts[to] = stmt;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// static analysis functions
|
|
|
|
StatementPtr StatementList::operator[](int index) {
|
|
assert(index >= 0 && index < getCount());
|
|
return m_stmts[index];
|
|
}
|
|
|
|
bool StatementList::hasDecl() const {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
if (m_stmts[i]->hasDecl()) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool StatementList::hasImpl() const {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
if (m_stmts[i]->hasImpl()) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
ExpressionPtr StatementList::getEffectiveImpl(AnalysisResultConstPtr ar) const {
|
|
ExpressionListPtr rep;
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
StatementPtr s = m_stmts[i];
|
|
if (s->is(KindOfReturnStatement)) {
|
|
ExpressionPtr e = static_pointer_cast<ReturnStatement>(s)->getRetExp();
|
|
if (!e) {
|
|
e = CONSTANT("null");
|
|
} else if (!e->isScalar()) {
|
|
break;
|
|
}
|
|
if (!rep) return e;
|
|
|
|
rep->addElement(e);
|
|
return rep;
|
|
}
|
|
if (s->hasImpl()) {
|
|
break;
|
|
}
|
|
}
|
|
return ExpressionPtr();
|
|
}
|
|
|
|
bool StatementList::hasBody() const {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
if (m_stmts[i]->hasBody()) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool StatementList::hasRetExp() const {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
if (m_stmts[i]->hasRetExp()) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void StatementList::analyzeProgram(AnalysisResultPtr ar) {
|
|
m_included = true;
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
StatementPtr stmt = m_stmts[i];
|
|
|
|
// effect testing
|
|
if (ar->getPhase() == AnalysisResult::AnalyzeAll) {
|
|
if (!stmt->hasEffect() && !stmt->hasDecl() &&
|
|
!stmt->is(Statement::KindOfStatementList)) {
|
|
Compiler::Error(Compiler::StatementHasNoEffect, stmt);
|
|
}
|
|
}
|
|
|
|
stmt->analyzeProgram(ar);
|
|
}
|
|
}
|
|
|
|
bool StatementList::mergeConcatAssign() {
|
|
if (Option::LocalCopyProp) {
|
|
return false;
|
|
} else {
|
|
// check for vector string concat assignment such as
|
|
// $space = " ";
|
|
// $a .= "hello";
|
|
// $a .= $space;
|
|
// $a .= "world!";
|
|
// turn into (for constant folding and concat sequence)
|
|
// $a .= " " . "hello " . $space . "world!";
|
|
unsigned int i = 0;
|
|
bool merged = false;
|
|
do {
|
|
std::string lhsName;
|
|
int length = 0;
|
|
for (; i < m_stmts.size(); i++) {
|
|
StatementPtr stmt = m_stmts[i];
|
|
if (!stmt->is(Statement::KindOfExpStatement)) break;
|
|
ExpStatementPtr expStmt = dynamic_pointer_cast<ExpStatement>(stmt);
|
|
ExpressionPtr exp = expStmt->getExpression();
|
|
|
|
// check the first assignment
|
|
if (exp->is(Expression::KindOfAssignmentExpression)) {
|
|
AssignmentExpressionPtr assignment_exp =
|
|
dynamic_pointer_cast<AssignmentExpression>(exp);
|
|
ExpressionPtr variable = assignment_exp->getVariable();
|
|
ExpressionPtr value = assignment_exp->getValue();
|
|
std::string variableName = variable->getText();
|
|
if (variableName.find("->") != std::string::npos) break;
|
|
if (value->hasEffect()) break;
|
|
// cannot turn $a .= $b; a .= $a into $a .= $b . $a;
|
|
if (value->getText().find(variableName) != std::string::npos) break;
|
|
if (lhsName.empty()) {
|
|
lhsName = variable->getText();
|
|
length++;
|
|
continue;
|
|
} else {
|
|
break;
|
|
}
|
|
} else if (!exp->is(Expression::KindOfBinaryOpExpression)) {
|
|
break;
|
|
}
|
|
BinaryOpExpressionPtr binaryOpExp =
|
|
dynamic_pointer_cast<BinaryOpExpression>(exp);
|
|
if (binaryOpExp->getOp() != T_CONCAT_EQUAL) break;
|
|
ExpressionPtr exp1 = binaryOpExp->getExp1();
|
|
std::string exp1Text = exp1->getText();
|
|
if (exp1Text.find("->") != std::string::npos) break;
|
|
ExpressionPtr exp2 = binaryOpExp->getExp2();
|
|
if (exp2->hasEffect()) break;
|
|
if (exp2->getText().find(exp1Text) != std::string::npos) break;
|
|
if (lhsName.empty()) {
|
|
lhsName = exp1Text;
|
|
length++;
|
|
} else if (lhsName == exp1Text) {
|
|
length++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (length > 1) {
|
|
// replace m_stmts[j] to m_stmts[i - 1] with a new statement
|
|
unsigned j = i - length;
|
|
ExpStatementPtr expStmt;
|
|
ExpressionPtr exp;
|
|
BinaryOpExpressionPtr binaryOpExp;
|
|
ExpressionPtr var;
|
|
ExpressionPtr exp1;
|
|
ExpressionPtr exp2;
|
|
bool isAssignment = false;
|
|
expStmt = dynamic_pointer_cast<ExpStatement>(m_stmts[j++]);
|
|
exp = expStmt->getExpression();
|
|
if (exp->is(Expression::KindOfAssignmentExpression)) {
|
|
isAssignment = true;
|
|
AssignmentExpressionPtr assignment_exp =
|
|
dynamic_pointer_cast<AssignmentExpression>(exp);
|
|
var = assignment_exp->getVariable();
|
|
exp1 = assignment_exp->getValue();
|
|
} else {
|
|
binaryOpExp = dynamic_pointer_cast<BinaryOpExpression>(exp);
|
|
var = binaryOpExp->getExp1();
|
|
exp1 = binaryOpExp->getExp2();
|
|
}
|
|
|
|
for (; j < i; j++) {
|
|
expStmt = dynamic_pointer_cast<ExpStatement>(m_stmts[j]);
|
|
exp = expStmt->getExpression();
|
|
binaryOpExp = dynamic_pointer_cast<BinaryOpExpression>(exp);
|
|
exp2 = binaryOpExp->getExp2();
|
|
exp1 = BinaryOpExpressionPtr
|
|
(new BinaryOpExpression(getScope(), getLocation(),
|
|
exp1, exp2, '.'));
|
|
}
|
|
if (isAssignment) {
|
|
exp = AssignmentExpressionPtr
|
|
(new AssignmentExpression(exp->getScope(), exp->getLocation(),
|
|
var, exp1,
|
|
false));
|
|
} else {
|
|
exp = BinaryOpExpressionPtr
|
|
(new BinaryOpExpression(getScope(), getLocation(),
|
|
var, exp1, T_CONCAT_EQUAL));
|
|
}
|
|
expStmt = ExpStatementPtr
|
|
(new ExpStatement(getScope(), getLocation(), exp));
|
|
|
|
m_stmts[i - length] = expStmt;
|
|
for (j = i - (length - 1); i > j; i--) removeElement(j);
|
|
merged = true;
|
|
} else if (length == 0) {
|
|
i++;
|
|
}
|
|
} while (i < m_stmts.size());
|
|
return merged;
|
|
}
|
|
}
|
|
|
|
ConstructPtr StatementList::getNthKid(int n) const {
|
|
if (n < (int)m_stmts.size()) {
|
|
return m_stmts[n];
|
|
}
|
|
return ConstructPtr();
|
|
}
|
|
|
|
int StatementList::getKidCount() const {
|
|
return m_stmts.size();
|
|
}
|
|
|
|
void StatementList::setNthKid(int n, ConstructPtr cp) {
|
|
int s = m_stmts.size();
|
|
if (n >= s) {
|
|
assert(false);
|
|
} else {
|
|
m_stmts[n] = boost::dynamic_pointer_cast<Statement>(cp);
|
|
}
|
|
}
|
|
|
|
StatementPtr StatementList::preOptimize(AnalysisResultConstPtr ar) {
|
|
bool del = false;
|
|
bool changed = false;
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
StatementPtr &s = m_stmts[i];
|
|
if (del) {
|
|
if (s->hasReachableLabel()) {
|
|
del = false;
|
|
} else {
|
|
switch (s->getKindOf()) {
|
|
case Statement::KindOfBlockStatement:
|
|
case Statement::KindOfIfBranchStatement:
|
|
case Statement::KindOfIfStatement:
|
|
case Statement::KindOfWhileStatement:
|
|
case Statement::KindOfDoStatement:
|
|
case Statement::KindOfForStatement:
|
|
case Statement::KindOfSwitchStatement:
|
|
case Statement::KindOfCaseStatement:
|
|
case Statement::KindOfBreakStatement:
|
|
case Statement::KindOfContinueStatement:
|
|
case Statement::KindOfReturnStatement:
|
|
case Statement::KindOfGlobalStatement:
|
|
case Statement::KindOfStaticStatement:
|
|
case Statement::KindOfEchoStatement:
|
|
case Statement::KindOfUnsetStatement:
|
|
case Statement::KindOfExpStatement:
|
|
case Statement::KindOfForEachStatement:
|
|
case Statement::KindOfCatchStatement:
|
|
case Statement::KindOfTryStatement:
|
|
case Statement::KindOfThrowStatement:
|
|
removeElement(i--);
|
|
changed = true;
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (s) {
|
|
if (s->is(KindOfStatementList) && !s->hasDecl()) {
|
|
StatementListPtr stmts(static_pointer_cast<StatementList>(s));
|
|
removeElement(i);
|
|
m_stmts.insert(m_stmts.begin() + i,
|
|
stmts->m_stmts.begin(), stmts->m_stmts.end());
|
|
i--;
|
|
changed = true;
|
|
continue;
|
|
} else if (s->is(KindOfBlockStatement)) {
|
|
BlockStatementPtr bs(static_pointer_cast<BlockStatement>(s));
|
|
StatementListPtr stmts(bs->getStmts());
|
|
if (!stmts) {
|
|
removeElement(i--);
|
|
changed = true;
|
|
continue;
|
|
} else {
|
|
FunctionScopePtr fs(getFunctionScope());
|
|
if (fs && (!fs->inPseudoMain() || !stmts->hasDecl())) {
|
|
removeElement(i);
|
|
m_stmts.insert(m_stmts.begin() + i,
|
|
stmts->m_stmts.begin(), stmts->m_stmts.end());
|
|
i--;
|
|
changed = true;
|
|
continue;
|
|
}
|
|
}
|
|
} else if (Option::EliminateDeadCode) {
|
|
if (s->is(KindOfBreakStatement) ||
|
|
s->is(KindOfContinueStatement) ||
|
|
s->is(KindOfReturnStatement) ||
|
|
s->is(KindOfThrowStatement)) {
|
|
del = true;
|
|
} else if (s->is(KindOfExpStatement)) {
|
|
ExpressionPtr e =
|
|
dynamic_pointer_cast<ExpStatement>(s)->getExpression();
|
|
if (!e->hasEffect() && !e->isNoRemove()) {
|
|
removeElement(i--);
|
|
changed = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mergeConcatAssign()) changed = true;
|
|
return changed ? static_pointer_cast<Statement>(shared_from_this())
|
|
: StatementPtr();
|
|
}
|
|
|
|
StatementPtr StatementList::postOptimize(AnalysisResultConstPtr ar) {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
StatementPtr &s = m_stmts[i];
|
|
if (s->is(KindOfExpStatement) && !s->hasEffect()) {
|
|
ExpressionPtr e =
|
|
dynamic_pointer_cast<ExpStatement>(s)->getExpression();
|
|
if (e->isNoRemove()) continue;
|
|
if (Option::EliminateDeadCode ||
|
|
static_pointer_cast<ExpStatement>(s)->getExpression()->isScalar()) {
|
|
removeElement(i--);
|
|
getScope()->addUpdates(BlockScope::UseKindCaller);
|
|
continue;
|
|
}
|
|
} else if (s->is(KindOfBlockStatement) &&
|
|
!static_pointer_cast<BlockStatement>(s)->getStmts()) {
|
|
removeElement(i--);
|
|
getScope()->addUpdates(BlockScope::UseKindCaller);
|
|
continue;
|
|
}
|
|
}
|
|
return StatementPtr();
|
|
}
|
|
|
|
void StatementList::inferTypes(AnalysisResultPtr ar) {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
m_stmts[i]->inferTypes(ar);
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// code generation functions
|
|
|
|
void StatementList::outputPHP(CodeGenerator &cg, AnalysisResultPtr ar) {
|
|
for (unsigned int i = 0; i < m_stmts.size(); i++) {
|
|
StatementPtr stmt = m_stmts[i];
|
|
|
|
switch (cg.getContext()) {
|
|
case CodeGenerator::NoContext:
|
|
stmt->outputPHP(cg, ar);
|
|
break;
|
|
case CodeGenerator::PhpDeclaration:
|
|
if (stmt->is(Statement::KindOfFunctionStatement) ||
|
|
stmt->is(Statement::KindOfClassStatement) ||
|
|
stmt->is(Statement::KindOfInterfaceStatement)) {
|
|
cg.setContext(CodeGenerator::PhpImplementation);
|
|
stmt->outputPHP(cg, ar);
|
|
cg.setContext(CodeGenerator::PhpDeclaration);
|
|
}
|
|
break;
|
|
case CodeGenerator::PhpImplementation:
|
|
if (!stmt->is(Statement::KindOfFunctionStatement) &&
|
|
!stmt->is(Statement::KindOfClassStatement) &&
|
|
!stmt->is(Statement::KindOfInterfaceStatement)) {
|
|
stmt->outputPHP(cg, ar);
|
|
}
|
|
break;
|
|
default:
|
|
assert(false);
|
|
}
|
|
}
|
|
}
|