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();
}
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();
}