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a2029fa58e
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
139 lines
6.0 KiB
LLVM
139 lines
6.0 KiB
LLVM
; REQUIRES: object-emission
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; RUN: llc -mtriple=i386-linux-gnu -filetype=obj -relocation-model=pic %s -o /dev/null
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; Derived from the test case in PR20367, there's nothing really positive to
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; test here (hence no FileCheck, etc). All that was wrong is that the debug info
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; intrinsics (introduced by inlining) in 'f1' were causing codegen to crash, but
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; since 'f1' is a nodebug function, there's no positive outcome to confirm, just
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; that debug info doesn't get in the way/cause a crash.
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; The test case isn't particularly well reduced/tidy, but as simple as I could
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; get the C++ source. I assume the complexity is mostly just about producing a
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; certain amount of register pressure, so it might be able to be simplified/made
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; more uniform.
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; Generated from:
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; $ clang-tot -cc1 -triple i386 -emit-obj -g -O3 repro.cpp
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; void sink(const void *);
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; int source();
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; void f3(int);
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;
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; extern bool b;
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;
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; struct string {
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; unsigned *mem;
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; };
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;
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; extern string &str;
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;
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; inline __attribute__((always_inline)) void s2(string *lhs) { sink(lhs->mem); }
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; inline __attribute__((always_inline)) void f() {
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; string str2;
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; s2(&str2);
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; sink(&str2);
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; }
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; void __attribute__((nodebug)) f1() {
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; for (int iter = 0; iter != 2; ++iter) {
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; f();
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; sink(str.mem);
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; if (b) return;
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; }
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; }
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%struct.string = type { i32* }
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@str = external constant %struct.string*
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@b = external global i8
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; Function Attrs: nounwind
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define void @_Z2f1v() #0 {
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entry:
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%str2.i = alloca %struct.string, align 4
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%0 = bitcast %struct.string* %str2.i to i8*, !dbg !26
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%1 = load %struct.string*, %struct.string** @str, align 4
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%mem = getelementptr inbounds %struct.string, %struct.string* %1, i32 0, i32 0
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%iter.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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call void @llvm.lifetime.start(i64 4, i8* %0), !dbg !26
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call void @llvm.dbg.value(metadata %struct.string* %str2.i, metadata !16, metadata !DIExpression(DW_OP_deref)) #3, !dbg !26
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call void @llvm.dbg.value(metadata %struct.string* %str2.i, metadata !27, metadata !DIExpression(DW_OP_deref)) #3, !dbg !29
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call void @_Z4sinkPKv(i8* undef) #3, !dbg !29
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call void @_Z4sinkPKv(i8* %0) #3, !dbg !30
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call void @llvm.lifetime.end(i64 4, i8* %0), !dbg !31
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%2 = load i32*, i32** %mem, align 4, !tbaa !32
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%3 = bitcast i32* %2 to i8*
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call void @_Z4sinkPKv(i8* %3) #3
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%4 = load i8, i8* @b, align 1, !tbaa !37, !range !39
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%tobool = icmp ne i8 %4, 0
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%inc = add nsw i32 %iter.02, 1
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%cmp = icmp eq i32 %inc, 2
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%or.cond = or i1 %tobool, %cmp
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br i1 %or.cond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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declare void @_Z4sinkPKv(i8*) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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; Function Attrs: nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture) #3
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; Function Attrs: nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) #3
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!23, !24}
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!llvm.ident = !{!25}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4}
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "string", line: 7, size: 32, align: 32, file: !5, elements: !6, identifier: "_ZTS6string")
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!5 = !DIFile(filename: "repro.cpp", directory: "/tmp/dbginfo")
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!6 = !{!7}
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!7 = !DIDerivedType(tag: DW_TAG_member, name: "mem", line: 8, size: 32, align: 32, file: !5, scope: !4, baseType: !8)
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, baseType: !9)
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
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!11 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", line: 14, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 14, file: !5, scope: !12, type: !13, retainedNodes: !15)
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!12 = !DIFile(filename: "repro.cpp", directory: "/tmp/dbginfo")
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!13 = !DISubroutineType(types: !14)
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!14 = !{null}
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!15 = !{!16}
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!16 = !DILocalVariable(name: "str2", line: 15, scope: !11, file: !12, type: !4)
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!17 = distinct !DISubprogram(name: "s2", linkageName: "_Z2s2P6string", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 13, file: !5, scope: !12, type: !18, retainedNodes: !21)
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!18 = !DISubroutineType(types: !19)
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!19 = !{null, !20}
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!20 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, baseType: !4)
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!21 = !{!22}
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!22 = !DILocalVariable(name: "lhs", line: 13, arg: 1, scope: !17, file: !12, type: !20)
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!23 = !{i32 2, !"Dwarf Version", i32 4}
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!24 = !{i32 2, !"Debug Info Version", i32 3}
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!25 = !{!"clang version 3.5.0 "}
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!26 = !DILocation(line: 15, scope: !11)
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!27 = !DILocalVariable(name: "lhs", line: 13, arg: 1, scope: !17, file: !12, type: !20)
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!28 = !DILocation(line: 16, scope: !11)
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!29 = !DILocation(line: 13, scope: !17, inlinedAt: !28)
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!30 = !DILocation(line: 17, scope: !11)
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!31 = !DILocation(line: 18, scope: !11)
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!32 = !{!33, !34, i64 0}
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!33 = !{!"struct", !34, i64 0}
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!34 = !{!"any pointer", !35, i64 0}
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!35 = !{!"omnipotent char", !36, i64 0}
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!36 = !{!"Simple C/C++ TBAA"}
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!37 = !{!38, !38, i64 0}
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!38 = !{!"bool", !35, i64 0}
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!39 = !{i8 0, i8 2}
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