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Fix for Bug 48055. 

Differential Revision: https://reviews.llvm.org/D92599
This commit is contained in:
Hiroshi Yamauchi 2020-12-03 11:04:19 -08:00
parent 5ad6ed5298
commit f9c3954a6e
2 changed files with 31 additions and 2 deletions
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4
llvm/lib/Transforms/Utils/Evaluator.cpp
View File

@ -183,11 +183,11 @@ evaluateBitcastFromPtr(Constant *Ptr, const DataLayout &DL,
std::function<Constant *(Constant *)> Func) {
Constant *Val;
while (!(Val = Func(Ptr))) {
// If Ty is a struct, we can convert the pointer to the struct
// If Ty is a non-opaque struct, we can convert the pointer to the struct
// into a pointer to its first member.
// FIXME: This could be extended to support arrays as well.
Type *Ty = cast<PointerType>(Ptr->getType())->getElementType();
if (!isa<StructType>(Ty))
if (!isa<StructType>(Ty) || cast<StructType>(Ty)->isOpaque())
break;
IntegerType *IdxTy = IntegerType::get(Ty->getContext(), 32);

29
llvm/test/Transforms/GlobalOpt/evaluate-bitcast-4.ll Normal file
View File

@ -0,0 +1,29 @@
; PR48055. Check that this does not crash.
; RUN: opt -globalopt %s -disable-output
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.g = type opaque
%struct.a = type { i32 (...)** }
@l = dso_local global i32 0, align 4
@h = external dso_local global %struct.g, align 1
@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_bug48055.cc, i8* null }]
; Function Attrs: uwtable
define internal void @__cxx_global_var_init() {
entry:
%vtable = load i32 (%struct.a*)**, i32 (%struct.a*)*** bitcast (%struct.g* @h to i32 (%struct.a*)***), align 1
%0 = load i32 (%struct.a*)*, i32 (%struct.a*)** %vtable, align 8
%call = call i32 %0(%struct.a* nonnull dereferenceable(8) bitcast (%struct.g* @h to %struct.a*))
store i32 %call, i32* @l, align 4
ret void
}
; Function Attrs: uwtable
define internal void @_GLOBAL__sub_I_bug48055.cc() {
entry:
call void @__cxx_global_var_init()
ret void
}