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
172 lines
7.5 KiB
LLVM
172 lines
7.5 KiB
LLVM
; RUN: llc %s -filetype=obj -O0 -mtriple=i386-unknown-linux-gnu -dwarf-version=4 -o %t
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; RUN: llvm-dwarfdump -v %t | FileCheck %s
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; From the code:
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; debug-loc-offset1.cc
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; int bar (int b) {
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; return b+4;
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; }
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; debug-loc-offset2.cc
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; struct A {
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; int var;
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; virtual char foo();
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; };
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; void baz(struct A a) {
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; int z = 2;
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; if (a.var > 2)
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; z++;
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; if (a.foo() == 'a')
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; z++;
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; }
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; Compiled separately for i386-pc-linux-gnu and linked together.
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; This ensures that we have multiple compile units and multiple location lists
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; so that we can verify that
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; debug_loc entries are relative to the low_pc of the CU. The loc entry for
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; the byval argument in foo.cpp is in the second CU and so should have
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; an offset relative to that CU rather than from the beginning of the text
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; section.
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; Checking that we have two compile units with two sets of high/lo_pc.
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; CHECK: .debug_info contents
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_low_pc {{.*}} (0x0000000000000020)
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; CHECK: DW_AT_high_pc
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_linkage_name [DW_FORM_strp]{{.*}}"_Z3baz1A"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ({{.*}}
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; CHECK-NEXT: [0x00000000, 0x00000017): DW_OP_breg0 EAX+0, DW_OP_deref
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; CHECK-NEXT: [0x00000017, 0x00000043): DW_OP_breg5 EBP-8, DW_OP_deref, DW_OP_deref
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}}"a"
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_location [DW_FORM_exprloc]
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; CHECK-NOT: DW_AT_location
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_low_pc {{.*}} (0x0000000000000000)
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; CHECK: DW_AT_high_pc
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_linkage_name [DW_FORM_strp]{{.*}}"_Z3bari"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ({{.*}}
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; CHECK-NEXT: [0x00000000, 0x0000000a): DW_OP_consts +0, DW_OP_stack_value
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; CHECK-NEXT: [0x0000000a, 0x00000017): DW_OP_consts +1, DW_OP_stack_value)
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}}"b"
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; CHECK: .debug_loc contents:
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; CHECK: 0x00000000:
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; CHECK-NEXT: [0x00000000, 0x0000000a): DW_OP_consts +0, DW_OP_stack_value
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; CHECK-NEXT: [0x0000000a, 0x00000017): DW_OP_consts +1, DW_OP_stack_value
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; CHECK: 0x00000022:
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; CHECK-NEXT: [0x00000000, 0x00000017): DW_OP_breg0 EAX+0, DW_OP_deref
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; CHECK-NEXT: [0x00000017, 0x00000043): DW_OP_breg5 EBP-8, DW_OP_deref, DW_OP_deref
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%struct.A = type { i32 (...)**, i32 }
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; Function Attrs: nounwind
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define i32 @_Z3bari(i32 %b) #0 !dbg !4 {
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entry:
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%b.addr = alloca i32, align 4
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store i32 %b, i32* %b.addr, align 4
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call void @llvm.dbg.value(metadata i32 0, metadata !21, metadata !DIExpression()), !dbg !22
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%0 = load i32, i32* %b.addr, align 4, !dbg !23
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call void @llvm.dbg.value(metadata i32 1, metadata !21, metadata !DIExpression()), !dbg !22
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%add = add nsw i32 %0, 4, !dbg !23
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ret i32 %add, !dbg !23
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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define void @_Z3baz1A(%struct.A* %a) #2 !dbg !14 {
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entry:
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%z = alloca i32, align 4
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call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !24, metadata !DIExpression(DW_OP_deref)), !dbg !25
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call void @llvm.dbg.declare(metadata i32* %z, metadata !26, metadata !DIExpression()), !dbg !27
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store i32 2, i32* %z, align 4, !dbg !27
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%var = getelementptr inbounds %struct.A, %struct.A* %a, i32 0, i32 1, !dbg !28
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%0 = load i32, i32* %var, align 4, !dbg !28
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%cmp = icmp sgt i32 %0, 2, !dbg !28
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br i1 %cmp, label %if.then, label %if.end, !dbg !28
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if.then: ; preds = %entry
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%1 = load i32, i32* %z, align 4, !dbg !30
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%inc = add nsw i32 %1, 1, !dbg !30
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store i32 %inc, i32* %z, align 4, !dbg !30
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br label %if.end, !dbg !30
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if.end: ; preds = %if.then, %entry
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%call = call signext i8 @_ZN1A3fooEv(%struct.A* %a), !dbg !31
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%conv = sext i8 %call to i32, !dbg !31
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%cmp1 = icmp eq i32 %conv, 97, !dbg !31
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br i1 %cmp1, label %if.then2, label %if.end4, !dbg !31
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if.then2: ; preds = %if.end
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%2 = load i32, i32* %z, align 4, !dbg !33
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%inc3 = add nsw i32 %2, 1, !dbg !33
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store i32 %inc3, i32* %z, align 4, !dbg !33
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br label %if.end4, !dbg !33
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if.end4: ; preds = %if.then2, %if.end
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ret void, !dbg !34
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}
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declare signext i8 @_ZN1A3fooEv(%struct.A*) #2
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0, !9}
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!llvm.module.flags = !{!18, !19}
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!llvm.ident = !{!20, !20}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 (210479)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "debug-loc-offset1.cc", directory: "/llvm_cmake_gcc")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bari", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "debug-loc-offset1.cc", directory: "/llvm_cmake_gcc")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 (210479)", isOptimized: false, emissionKind: FullDebug, file: !10, enums: !2, retainedTypes: !11, globals: !2, imports: !2)
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!10 = !DIFile(filename: "debug-loc-offset2.cc", directory: "/llvm_cmake_gcc")
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!11 = !{!12}
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!12 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", line: 1, flags: DIFlagFwdDecl, file: !10, identifier: "_ZTS1A")
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!14 = distinct !DISubprogram(name: "baz", linkageName: "_Z3baz1A", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !9, scopeLine: 6, file: !10, scope: !15, type: !16, retainedNodes: !2)
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!15 = !DIFile(filename: "debug-loc-offset2.cc", directory: "/llvm_cmake_gcc")
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!16 = !DISubroutineType(types: !17)
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!17 = !{null, !12}
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!18 = !{i32 2, !"Dwarf Version", i32 4}
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!19 = !{i32 2, !"Debug Info Version", i32 3}
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!20 = !{!"clang version 3.5.0 (210479)"}
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!21 = !DILocalVariable(name: "b", line: 1, arg: 1, scope: !4, file: !5, type: !8)
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!22 = !DILocation(line: 1, scope: !4)
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!23 = !DILocation(line: 2, scope: !4)
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!24 = !DILocalVariable(name: "a", line: 6, arg: 1, scope: !14, file: !15, type: !12)
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!25 = !DILocation(line: 6, scope: !14)
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!26 = !DILocalVariable(name: "z", line: 7, scope: !14, file: !15, type: !8)
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!27 = !DILocation(line: 7, scope: !14)
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!28 = !DILocation(line: 8, scope: !29)
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!29 = distinct !DILexicalBlock(line: 8, column: 0, file: !10, scope: !14)
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!30 = !DILocation(line: 9, scope: !29)
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!31 = !DILocation(line: 10, scope: !32)
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!32 = distinct !DILexicalBlock(line: 10, column: 0, file: !10, scope: !14)
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!33 = !DILocation(line: 11, scope: !32)
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!34 = !DILocation(line: 12, scope: !14)
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