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Add an artificial line-0 debug location when the compiler emits a call to

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__stack_chk_fail(). This avoids a compiler crash.

Differential Revision: http://reviews.llvm.org/D21818

llvm-svn: 274263
This commit is contained in:
Yunzhong Gao 2016-06-30 18:49:04 +00:00
parent 5de4bb8b54
commit f61f3668ec
2 changed files with 26 additions and 0 deletions
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2
lib/CodeGen/StackProtector.cpp
View File

@ -24,6 +24,7 @@
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
@ -447,6 +448,7 @@ BasicBlock *StackProtector::CreateFailBB() {
LLVMContext &Context = F->getContext();
BasicBlock *FailBB = BasicBlock::Create(Context, "CallStackCheckFailBlk", F);
IRBuilder<> B(FailBB);
B.SetCurrentDebugLocation(DebugLoc::get(0, 0, F->getSubprogram()));
if (Trip.isOSOpenBSD()) {
Constant *StackChkFail =
M->getOrInsertFunction("__stack_smash_handler",

24
test/CodeGen/X86/stack-protector.ll
View File

@ -3880,6 +3880,17 @@ entry:
ret i32 %call
}
define void @__stack_chk_fail() #1 !dbg !6 {
entry:
ret void
}
define void @test32() #1 !dbg !7 {
entry:
%0 = alloca [5 x i8], align 1
ret void
}
declare double @testi_aux()
declare i8* @strcpy(i8*, i8*)
declare i32 @printf(i8*, ...)
@ -3899,3 +3910,16 @@ attributes #2 = { sspreq }
attributes #3 = { ssp "stack-protector-buffer-size"="33" }
attributes #4 = { ssp "stack-protector-buffer-size"="5" }
attributes #5 = { ssp "stack-protector-buffer-size"="6" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
!1 = !DIFile(filename: "test.c", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version x.y.z"}
!6 = distinct !DISubprogram(name: "__stack_chk_fail", scope: !1, unit: !0)
!7 = distinct !DISubprogram(name: "foo", scope: !1, unit: !0)