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

__stack_chk_fail(). This avoids a compiler crash.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274263 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/StackProtector.cpp b/lib/CodeGen/StackProtector.cpp
index 2912f77810e1534e8b482ff6750b223d08c669b4..89868e43aba48ae4d4497254d8054634ac0baff1 100644 (file)
--- a/lib/CodeGen/StackProtector.cpp
+++ b/lib/CodeGen/StackProtector.cpp
@@ -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",

diff --git a/test/CodeGen/X86/stack-protector.ll b/test/CodeGen/X86/stack-protector.ll
index 63dc412078f0dcf00bfc76387a884ed9608237e5..ddfb14ca8cfe7409ef9da94aaab3df6f3598cd9e 100644 (file)
--- a/test/CodeGen/X86/stack-protector.ll
+++ b/test/CodeGen/X86/stack-protector.ll
@@ -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)