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[asan] fix debug info produced for asan-coverage=2 

llvm-svn: 217106
This commit is contained in:
Kostya Serebryany 2014-09-03 23:24:18 +00:00
parent 5007741d68
commit 3175521844
2 changed files with 78 additions and 1 deletions
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4
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -1321,7 +1321,9 @@ void AddressSanitizer::InjectCoverageAtBlock(Function &F, BasicBlock &BB) {
break;
}
DebugLoc EntryLoc = IP->getDebugLoc().getFnDebugLoc(*C);
DebugLoc EntryLoc = &BB == &F.getEntryBlock()
? IP->getDebugLoc().getFnDebugLoc(*C)
: IP->getDebugLoc();
IRBuilder<> IRB(IP);
IRB.SetCurrentDebugLocation(EntryLoc);
Type *Int8Ty = IRB.getInt8Ty();

75
llvm/test/Instrumentation/AddressSanitizer/coverage2-dbg.ll Normal file
View File

@ -0,0 +1,75 @@
; Test that coverage instrumentation does not lose debug location.
; RUN: opt < %s -asan -asan-module -asan-coverage=2 -S | FileCheck %s
; C++ source:
; 1: void foo(int *a) {
; 2: if (a)
; 3: *a = 0;
; 4: }
; clang++ if.cc -O3 -g -S -emit-llvm
; and add sanitize_address to @_Z3fooPi
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Check that __sanitizer_cov call has !dgb pointing to the beginning
; of appropriate basic blocks.
; CHECK-LABEL:_Z3fooPi
; CHECK: call void @__sanitizer_cov(), !dbg [[A:!.*]]
; CHECK: call void @__sanitizer_cov(), !dbg [[B:!.*]]
; CHECK: call void @__sanitizer_cov(), !dbg [[C:!.*]]
; CHECK: ret void
; CHECK: [[A]] = metadata !{i32 1, i32 0, metadata !{{.*}}, null}
; CHECK: [[B]] = metadata !{i32 3, i32 5, metadata !{{.*}}, null}
; CHECK: [[C]] = metadata !{i32 4, i32 1, metadata !{{.*}}, null}
define void @_Z3fooPi(i32* %a) #0 {
entry:
tail call void @llvm.dbg.value(metadata !{i32* %a}, i64 0, metadata !11), !dbg !15
%tobool = icmp eq i32* %a, null, !dbg !16
br i1 %tobool, label %if.end, label %if.then, !dbg !16
if.then: ; preds = %entry
store i32 0, i32* %a, align 4, !dbg !18, !tbaa !19
br label %if.end, !dbg !18
if.end: ; preds = %entry, %if.then
ret void, !dbg !23
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata) #1
attributes #0 = { nounwind 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" sanitize_address}
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!12, !13}
!llvm.ident = !{!14}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.6.0 (217079)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [FOO/if.cc] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"if.cc", metadata !"FOO"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"_Z3fooPi", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (i32*)* @_Z3fooPi, null, null, metadata !10, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [foo]
!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [FOO/if.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, metadata !8}
!8 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !9} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from int]
!9 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!10 = metadata !{metadata !11}
!11 = metadata !{i32 786689, metadata !4, metadata !"a", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 1]
!12 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!13 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
!14 = metadata !{metadata !"clang version 3.6.0 (217079)"}
!15 = metadata !{i32 1, i32 15, metadata !4, null}
!16 = metadata !{i32 2, i32 7, metadata !17, null}
!17 = metadata !{i32 786443, metadata !1, metadata !4, i32 2, i32 7, i32 0} ; [ DW_TAG_lexical_block ] [FOO/if.cc]
!18 = metadata !{i32 3, i32 5, metadata !17, null}
!19 = metadata !{metadata !20, metadata !20, i64 0}
!20 = metadata !{metadata !"int", metadata !21, i64 0}
!21 = metadata !{metadata !"omnipotent char", metadata !22, i64 0}
!22 = metadata !{metadata !"Simple C/C++ TBAA"}
!23 = metadata !{i32 4, i32 1, metadata !4, null}