[asan] Set debug location in ASan function prologue.

Most importantly, it gives debug location info to the coverage callback.

This change also removes 2 cases of unnecessary setDebugLoc when IRBuilder
is created with the same debug location.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208767 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 0 deletions

diff --git a/test/Instrumentation/AddressSanitizer/coverage-dbg.ll b/test/Instrumentation/AddressSanitizer/coverage-dbg.ll
new file mode 100644
index 0000000000..77d7286705
--- /dev/null
+++ b/test/Instrumentation/AddressSanitizer/coverage-dbg.ll
@@ -0,0 +1,33 @@
+; Test that coverage instrumentation does not lose debug location.
+
+; RUN: opt < %s -asan -asan-module -asan-coverage=1 -S | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: nounwind readnone uwtable
+define void @_Z1fv() #0 {
+entry:
+  ret void, !dbg !11
+}
+
+; CHECK: call void @__sanitizer_cov(), !dbg !
+
+attributes #0 = { sanitize_address nounwind readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!8, !9}
+!llvm.ident = !{!10}
+
+!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 (208682)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp//tmp/1.cc] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !"/tmp/1.cc", metadata !"/tmp"}
+!2 = metadata !{}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"f", metadata !"f", metadata !"_Z1fv", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void ()* @_Z1fv, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [f]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/tmp//tmp/1.cc]
+!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = metadata !{null}
+!8 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!9 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!10 = metadata !{metadata !"clang version 3.5.0 (208682)"}
+!11 = metadata !{i32 2, i32 0, metadata !4, null}