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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
67 lines
2.5 KiB
LLVM
67 lines
2.5 KiB
LLVM
; RUN: llc < %s -stop-before=expand-isel-pseudos -o - | FileCheck %s
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source_filename = "foo.c"
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target datalayout = "E-m:e-p:32:32-i64:64-n32"
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target triple = "ppc32"
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; Verify that, when handling split-up integers, the
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; transferring of debug info takes the endianness
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; into consideration.
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;
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; The fragment expression at offset 0 should correspond
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; to the high part of the value on big-endian targets.
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; This basis of this ll file was created by running:
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; clang --target=powerpc -O1 -S -g -emit-llvm foo.c
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;
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; with foo.c being the program:
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; unsigned long long foo(void);
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; void bar() {
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; volatile unsigned long long result = foo();
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; }
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;
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; This file is a slight tweak of that output, with irrelevant
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; lifetime intrinsics, metadata, and debug info being removed.
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; CHECK: [[DL:![0-9]+]] = !DILocalVariable(name: "result"
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;
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; High 32 bits in R3, low 32 bits in R4
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; CHECK: %0:gprc = COPY $r3
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; CHECK: DBG_VALUE debug-use %0, debug-use $noreg, [[DL]], !DIExpression(DW_OP_LLVM_fragment, 0, 32)
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; CHECK: %1:gprc = COPY $r4
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; CHECK: DBG_VALUE debug-use %1, debug-use $noreg, [[DL]], !DIExpression(DW_OP_LLVM_fragment, 32, 32)
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define void @bar() local_unnamed_addr #0 !dbg !6 {
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%1 = alloca i64, align 8
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%2 = tail call i64 @foo()
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tail call void @llvm.dbg.value(metadata i64 %2, metadata !10, metadata !DIExpression()), !dbg !13
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store volatile i64 %2, i64* %1, align 8
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ret void
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}
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declare i64 @foo() local_unnamed_addr
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.c", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 6.0.0"}
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!6 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: !0, retainedNodes: !9)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !{!10}
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!10 = !DILocalVariable(name: "result", scope: !6, file: !1, line: 3, type: !11)
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!11 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12)
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!12 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!13 = !DILocation(line: 3, column: 31, scope: !6)
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