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Outline evaluation of calls to builtins to avoid inflating stack usage for the 

common case of a call to a non-builtin, particularly for unoptimized ASan
builds (where the per-variable stack usage can be quite high).

llvm-svn: 287066
This commit is contained in:
Richard Smith 2016-11-16 00:57:23 +00:00
parent b3dc774a99
commit 6328cbd31b
1 changed files with 19 additions and 1 deletions
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20
clang/lib/AST/ExprConstant.cpp
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@ -5073,6 +5073,7 @@ public:
bool VisitAddrLabelExpr(const AddrLabelExpr *E)
{ return Success(E); }
bool VisitCallExpr(const CallExpr *E);
bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp);
bool VisitBlockExpr(const BlockExpr *E) {
if (!E->getBlockDecl()->hasCaptures())
return Success(E);
@ -5267,7 +5268,15 @@ bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (IsStringLiteralCall(E))
return Success(E);
switch (unsigned BuiltinOp = E->getBuiltinCallee()) {
if (unsigned BuiltinOp = E->getBuiltinCallee())
return VisitBuiltinCallExpr(E, BuiltinOp);
return ExprEvaluatorBaseTy::VisitCallExpr(E);
}
bool PointerExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
unsigned BuiltinOp) {
switch (BuiltinOp) {
case Builtin::BI__builtin_addressof:
return EvaluateLValue(E->getArg(0), Result, Info);
case Builtin::BI__builtin_assume_aligned: {
@ -6352,6 +6361,7 @@ public:
}
bool VisitCallExpr(const CallExpr *E);
bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp);
bool VisitBinaryOperator(const BinaryOperator *E);
bool VisitOffsetOfExpr(const OffsetOfExpr *E);
bool VisitUnaryOperator(const UnaryOperator *E);
@ -6932,6 +6942,14 @@ bool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E,
}
bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (unsigned BuiltinOp = E->getBuiltinCallee())
return VisitBuiltinCallExpr(E, BuiltinOp);
return ExprEvaluatorBaseTy::VisitCallExpr(E);
}
bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
unsigned BuiltinOp) {
switch (unsigned BuiltinOp = E->getBuiltinCallee()) {
default:
return ExprEvaluatorBaseTy::VisitCallExpr(E);