2c864551df
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
81 lines
3.6 KiB
LLVM
81 lines
3.6 KiB
LLVM
; RUN: opt -run-twice -verify -S -o - %s | FileCheck %s
|
|
|
|
; The ValueMap shared between CloneFunctionInto calls within CloneModule needs
|
|
; to contain identity mappings for all of the DISubprogram's to prevent them
|
|
; from being duplicated by MapMetadata / RemapInstruction calls, this is
|
|
; achieved via DebugInfoFinder collecting all the DISubprogram's. However,
|
|
; CloneFunctionInto was missing calls into DebugInfoFinder for functions w/o
|
|
; DISubprogram's attached, but still referring DISubprogram's from within.
|
|
;
|
|
; This is to make sure we don't regress on that.
|
|
|
|
; Derived from the following C-snippet
|
|
;
|
|
; int inlined(int j);
|
|
; __attribute__((nodebug)) int nodebug(int k) { return inlined(k); }
|
|
; __attribute__((always_inline)) int inlined(int j) { return j * 2; }
|
|
;
|
|
; compiled with `clang -O1 -g3 -emit-llvm -S` by removing
|
|
;
|
|
; call void @llvm.dbg.value(metadata i32 %k, metadata !8, metadata !DIExpression()), !dbg !14
|
|
;
|
|
; line from @nodebug function.
|
|
|
|
; The @llvm.dbg.value call is manually removed from @nodebug as not having
|
|
; it there also may cause an incorrect remapping of the call in a case of a
|
|
; regression, not just a duplication of a DISubprogram. Namely, the call's
|
|
; metadata !8 2nd argument and the !dbg !14 debug location may get remapped
|
|
; to reference different copies of the DISubprogram, which is verified by IR
|
|
; Verifier, while having DISubprogram duplicates is not.
|
|
|
|
; CHECK: DISubprogram
|
|
; CHECK-NOT: DISubprogram
|
|
|
|
source_filename = "clone-module.c"
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-apple-macosx"
|
|
|
|
; Function Attrs: nounwind readnone ssp uwtable
|
|
define i32 @nodebug(i32 %k) local_unnamed_addr #0 {
|
|
entry:
|
|
%mul.i = shl nsw i32 %k, 1, !dbg !15
|
|
ret i32 %mul.i
|
|
}
|
|
|
|
; Function Attrs: alwaysinline nounwind readnone ssp uwtable
|
|
define i32 @inlined(i32 %j) local_unnamed_addr #1 !dbg !9 {
|
|
entry:
|
|
call void @llvm.dbg.value(metadata i32 %j, metadata !8, metadata !DIExpression()), !dbg !14
|
|
%mul = shl nsw i32 %j, 1, !dbg !15
|
|
ret i32 %mul, !dbg !16
|
|
}
|
|
|
|
; Function Attrs: nounwind readnone speculatable
|
|
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
|
|
|
|
attributes #0 = { nounwind readnone ssp uwtable }
|
|
attributes #1 = { alwaysinline nounwind readnone ssp uwtable }
|
|
attributes #2 = { nounwind readnone speculatable }
|
|
|
|
!llvm.dbg.cu = !{!0}
|
|
!llvm.module.flags = !{!3, !4, !5, !6}
|
|
!llvm.ident = !{!7}
|
|
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0 (https://git.llvm.org/git/clang.git/ 195459d046e795f5952f7d2121e505eeb59c5574) (https://git.llvm.org/git/llvm.git/ 69ec7d5667e9928db8435bfbee0da151c85a91c9)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
|
|
!1 = !DIFile(filename: "clone-module.c", directory: "/somewhere")
|
|
!2 = !{}
|
|
!3 = !{i32 2, !"Dwarf Version", i32 4}
|
|
!4 = !{i32 2, !"Debug Info Version", i32 3}
|
|
!5 = !{i32 1, !"wchar_size", i32 4}
|
|
!6 = !{i32 7, !"PIC Level", i32 2}
|
|
!7 = !{!"clang version 7.0.0 (https://git.llvm.org/git/clang.git/ 195459d046e795f5952f7d2121e505eeb59c5574) (https://git.llvm.org/git/llvm.git/ 69ec7d5667e9928db8435bfbee0da151c85a91c9)"}
|
|
!8 = !DILocalVariable(name: "j", arg: 1, scope: !9, file: !1, line: 3, type: !12)
|
|
!9 = distinct !DISubprogram(name: "inlined", scope: !1, file: !1, line: 3, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
|
|
!10 = !DISubroutineType(types: !11)
|
|
!11 = !{!12, !12}
|
|
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
|
!13 = !{!8}
|
|
!14 = !DILocation(line: 3, column: 48, scope: !9)
|
|
!15 = !DILocation(line: 3, column: 62, scope: !9)
|
|
!16 = !DILocation(line: 3, column: 53, scope: !9)
|