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PR4123: don't crash when inlining a call which uses its own result.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71199 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-05-08 00:22:04 +00:00
parent 9d928c223f
commit 5877ad7e90
2 changed files with 30 additions and 3 deletions
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13
lib/Transforms/Utils/InlineFunction.cpp
View File

@ -516,7 +516,10 @@ bool llvm::InlineFunction(CallSite CS, CallGraph *CG, const TargetData *TD) {
// uses of the returned value.
if (!TheCall->use_empty()) {
ReturnInst *R = Returns[0];
TheCall->replaceAllUsesWith(R->getReturnValue());
if (TheCall == R->getReturnValue())
TheCall->replaceAllUsesWith(UndefValue::get(TheCall->getType()));
else
TheCall->replaceAllUsesWith(R->getReturnValue());
}
// Since we are now done with the Call/Invoke, we can delete it.
TheCall->eraseFromParent();
@ -605,8 +608,12 @@ bool llvm::InlineFunction(CallSite CS, CallGraph *CG, const TargetData *TD) {
} else if (!Returns.empty()) {
// Otherwise, if there is exactly one return value, just replace anything
// using the return value of the call with the computed value.
if (!TheCall->use_empty())
TheCall->replaceAllUsesWith(Returns[0]->getReturnValue());
if (!TheCall->use_empty()) {
if (TheCall == Returns[0]->getReturnValue())
TheCall->replaceAllUsesWith(UndefValue::get(TheCall->getType()));
else
TheCall->replaceAllUsesWith(Returns[0]->getReturnValue());
}
// Splice the code from the return block into the block that it will return
// to, which contains the code that was after the call.

20
test/Transforms/Inline/2009-05-07-CallUsingSelfCrash.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: llvm-as < %s | opt -inline -disable-output
; PR4123
%struct.S0 = type <{ i32 }>
%struct.S1 = type <{ i8, i8, i8, i8, %struct.S0 }>
%struct.S2 = type <{ %struct.S1, i32 }>
define void @func_113(%struct.S1* noalias nocapture sret %agg.result, i8 signext %p_114) noreturn nounwind {
entry:
unreachable
for.inc: ; preds = %for.inc
%call48 = call fastcc signext i8 @safe_sub_func_uint8_t_u_u(i8 signext %call48) ; <i8> [#uses=1]
br label %for.inc
}
define fastcc signext i8 @safe_sub_func_uint8_t_u_u(i8 signext %_ui1) nounwind readnone {
entry:
ret i8 %_ui1
}