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Don't crash during constant-evaluation of 1/(1/0). PR9262. 

llvm-svn: 126541
This commit is contained in:
John McCall 2011-02-26 08:27:17 +00:00
parent 53fcbd2718
commit 4b13633082
2 changed files with 3 additions and 1 deletions
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2
clang/lib/AST/ExprConstant.cpp
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@ -2926,7 +2926,7 @@ static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
Exp->getOpcode() == BO_Rem) {
// Evaluate gives an error for undefined Div/Rem, so make sure
// we don't evaluate one.
if (LHSResult.Val != 2 && RHSResult.Val != 2) {
if (LHSResult.Val == 0 && RHSResult.Val == 0) {
llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx);
if (REval == 0)
return ICEDiag(1, E->getLocStart());

2
clang/test/Sema/i-c-e.c
View File

@ -66,6 +66,8 @@ int illegaldiv1b[1 && 1/0]; // expected-warning {{division by zero is undefined
int illegaldiv2[1/0]; // expected-error {{variable length array declaration not allowed at file scope}} \
// expected-warning {{division by zero is undefined}}
int illegaldiv3[INT_MIN / -1]; // expected-error {{variable length array declaration not allowed at file scope}}
// PR9262
int illegaldiv4[0 / (1 / 0)]; // expected-warning {{division by zero is undefined}} expected-error {{variable length array declaration not allowed at file scope}}
int chooseexpr[__builtin_choose_expr(1, 1, expr)];
int realop[(__real__ 4) == 4 ? 1 : -1];