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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
108 lines
5.0 KiB
LLVM
108 lines
5.0 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-apple-darwin < %s -filetype=obj \
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; RUN: | llvm-dwarfdump -v -debug-info - \
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; RUN: | FileCheck %s -check-prefix=CHECK -check-prefix=DWARF4
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; RUN: llc -O0 -mtriple=x86_64-apple-darwin < %s -filetype=obj -dwarf-version=3 \
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; RUN: | llvm-dwarfdump -v -debug-info - \
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; RUN: | FileCheck %s -check-prefix=CHECK -check-prefix=DWARF3
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; DWARF4: DW_AT_location [DW_FORM_sec_offset] (0x00000000
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; DWARF4-NEXT: {{.*}}: DW_OP_breg2 RCX+0, DW_OP_deref
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; DWARF3: DW_AT_location [DW_FORM_data4] (0x00000000
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; DWARF3-NEXT: {{.*}}: DW_OP_breg2 RCX+0, DW_OP_deref
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000067] = "vla")
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; Check the DEBUG_VALUE comments for good measure.
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; RUN: llc -O0 -mtriple=x86_64-apple-darwin %s -o - -filetype=asm | FileCheck %s -check-prefix=ASM-CHECK
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; vla should have a register-indirect address at one point.
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; ASM-CHECK: DEBUG_VALUE: vla <- [DW_OP_deref] [$rcx+0]
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; ASM-CHECK: DW_OP_breg2
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; RUN: llvm-as %s -o - | llvm-dis - | FileCheck %s --check-prefix=PRETTY-PRINT
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; PRETTY-PRINT: DIExpression(DW_OP_deref)
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define void @testVLAwithSize(i32 %s) nounwind uwtable ssp !dbg !5 {
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entry:
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%s.addr = alloca i32, align 4
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%saved_stack = alloca i8*
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%i = alloca i32, align 4
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store i32 %s, i32* %s.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %s.addr, metadata !10, metadata !DIExpression()), !dbg !11
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%0 = load i32, i32* %s.addr, align 4, !dbg !12
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%1 = zext i32 %0 to i64, !dbg !12
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%2 = call i8* @llvm.stacksave(), !dbg !12
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store i8* %2, i8** %saved_stack, !dbg !12
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%vla = alloca i32, i64 %1, align 16, !dbg !12
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call void @llvm.dbg.declare(metadata i32* %vla, metadata !14, metadata !30), !dbg !18
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call void @llvm.dbg.declare(metadata i32* %i, metadata !19, metadata !DIExpression()), !dbg !20
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store i32 0, i32* %i, align 4, !dbg !21
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br label %for.cond, !dbg !21
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for.cond: ; preds = %for.inc, %entry
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%3 = load i32, i32* %i, align 4, !dbg !21
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%4 = load i32, i32* %s.addr, align 4, !dbg !21
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%cmp = icmp slt i32 %3, %4, !dbg !21
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br i1 %cmp, label %for.body, label %for.end, !dbg !21
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for.body: ; preds = %for.cond
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%5 = load i32, i32* %i, align 4, !dbg !23
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%6 = load i32, i32* %i, align 4, !dbg !23
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%mul = mul nsw i32 %5, %6, !dbg !23
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%7 = load i32, i32* %i, align 4, !dbg !23
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%idxprom = sext i32 %7 to i64, !dbg !23
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%arrayidx = getelementptr inbounds i32, i32* %vla, i64 %idxprom, !dbg !23
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store i32 %mul, i32* %arrayidx, align 4, !dbg !23
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br label %for.inc, !dbg !25
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for.inc: ; preds = %for.body
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%8 = load i32, i32* %i, align 4, !dbg !26
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%inc = add nsw i32 %8, 1, !dbg !26
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store i32 %inc, i32* %i, align 4, !dbg !26
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br label %for.cond, !dbg !26
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for.end: ; preds = %for.cond
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%9 = load i8*, i8** %saved_stack, !dbg !27
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call void @llvm.stackrestore(i8* %9), !dbg !27
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ret void, !dbg !27
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare i8* @llvm.stacksave() nounwind
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declare void @llvm.stackrestore(i8*) nounwind
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!29}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.2 (trunk 156005) (llvm/trunk 156000)", isOptimized: false, emissionKind: FullDebug, file: !28, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "testVLAwithSize", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !28, scope: !6, type: !7, retainedNodes: !1)
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!6 = !DIFile(filename: "bar.c", directory: "/Users/echristo/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !DILocalVariable(name: "s", line: 1, arg: 1, scope: !5, file: !6, type: !9)
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!11 = !DILocation(line: 1, column: 26, scope: !5)
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!12 = !DILocation(line: 3, column: 13, scope: !13)
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!13 = distinct !DILexicalBlock(line: 2, column: 1, file: !28, scope: !5)
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!14 = !DILocalVariable(name: "vla", line: 3, scope: !13, file: !6, type: !15)
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!15 = !DICompositeType(tag: DW_TAG_array_type, align: 32, baseType: !9, elements: !16)
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!16 = !{!17}
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!17 = !DISubrange(count: -1)
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!18 = !DILocation(line: 3, column: 7, scope: !13)
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!19 = !DILocalVariable(name: "i", line: 4, scope: !13, file: !6, type: !9)
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!20 = !DILocation(line: 4, column: 7, scope: !13)
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!21 = !DILocation(line: 5, column: 8, scope: !22)
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!22 = distinct !DILexicalBlock(line: 5, column: 3, file: !28, scope: !13)
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!23 = !DILocation(line: 6, column: 5, scope: !24)
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!24 = distinct !DILexicalBlock(line: 5, column: 27, file: !28, scope: !22)
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!25 = !DILocation(line: 7, column: 3, scope: !24)
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!26 = !DILocation(line: 5, column: 22, scope: !22)
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!27 = !DILocation(line: 8, column: 1, scope: !13)
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!28 = !DIFile(filename: "bar.c", directory: "/Users/echristo/tmp")
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!29 = !{i32 1, !"Debug Info Version", i32 3}
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!30 = !DIExpression(DW_OP_deref)
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