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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
111 lines
5.4 KiB
LLVM
111 lines
5.4 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; C source:
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; void usethings(double *, void *p);
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; int realign_and_alloca(int n) {
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; double d = 0;
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; void *p = __builtin_alloca(n);
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; usethings(&d, p);
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; return 0;
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; }
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; CHECK: _realign_and_alloca: # @realign_and_alloca
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; CHECK: .cv_fpo_proc _realign_and_alloca 4
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; CHECK: pushl %ebp
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; CHECK: .cv_fpo_pushreg %ebp
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; CHECK: movl %esp, %ebp
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; CHECK: .cv_fpo_setframe %ebp
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; CHECK: pushl %esi
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; CHECK: .cv_fpo_pushreg %esi
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; We don't seem to need to describe this AND because at this point CSRs
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; are stored relative to EBP, but it's suspicious.
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; CHECK: andl $-16, %esp
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; CHECK: subl $32, %esp
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; CHECK: .cv_fpo_stackalloc 32
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; CHECK: .cv_fpo_endprologue
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; CHECK: movl %esp, %esi
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; CHECK: leal 8(%esi),
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; CHECK: calll _usethings
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; CHECK: addl $8, %esp
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; CHECK: xorl %eax, %eax
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; CHECK: leal -4(%ebp), %esp
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; CHECK: popl %esi
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; CHECK: popl %ebp
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; CHECK: retl
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; CHECK: .cv_fpo_endproc
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; ModuleID = 't.c'
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source_filename = "t.c"
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i386-pc-windows-msvc19.11.25508"
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; Function Attrs: nounwind
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define i32 @realign_and_alloca(i32 %n) local_unnamed_addr #0 !dbg !8 {
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entry:
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%d = alloca double, align 8
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tail call void @llvm.dbg.value(metadata i32 %n, metadata !13, metadata !DIExpression()), !dbg !18
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%0 = bitcast double* %d to i8*, !dbg !19
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call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0) #4, !dbg !19
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tail call void @llvm.dbg.value(metadata double 0.000000e+00, metadata !14, metadata !DIExpression()), !dbg !20
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store double 0.000000e+00, double* %d, align 8, !dbg !20, !tbaa !21
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%1 = alloca i8, i32 %n, align 16, !dbg !25
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tail call void @llvm.dbg.value(metadata i8* %1, metadata !16, metadata !DIExpression()), !dbg !26
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tail call void @llvm.dbg.value(metadata double* %d, metadata !14, metadata !DIExpression()), !dbg !20
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call void @usethings(double* nonnull %d, i8* nonnull %1) #4, !dbg !27
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call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %0) #4, !dbg !28
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ret i32 0, !dbg !29
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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declare void @usethings(double*, i8*) local_unnamed_addr #2
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { argmemonly nounwind }
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attributes #2 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind readnone speculatable }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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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: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "cfdc2deff5dc50f95e287f877660d4dd")
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!2 = !{}
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!3 = !{i32 1, !"NumRegisterParameters", i32 0}
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!4 = !{i32 2, !"CodeView", i32 1}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = !{i32 1, !"wchar_size", i32 2}
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!7 = !{!"clang version 6.0.0 "}
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!8 = distinct !DISubprogram(name: "realign_and_alloca", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11, !11}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !{!13, !14, !16}
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!13 = !DILocalVariable(name: "n", arg: 1, scope: !8, file: !1, line: 2, type: !11)
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!14 = !DILocalVariable(name: "d", scope: !8, file: !1, line: 3, type: !15)
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!15 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
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!16 = !DILocalVariable(name: "p", scope: !8, file: !1, line: 4, type: !17)
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!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 32)
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!18 = !DILocation(line: 2, column: 28, scope: !8)
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!19 = !DILocation(line: 3, column: 3, scope: !8)
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!20 = !DILocation(line: 3, column: 10, scope: !8)
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!21 = !{!22, !22, i64 0}
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!22 = !{!"double", !23, i64 0}
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!23 = !{!"omnipotent char", !24, i64 0}
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!24 = !{!"Simple C/C++ TBAA"}
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!25 = !DILocation(line: 4, column: 13, scope: !8)
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!26 = !DILocation(line: 4, column: 9, scope: !8)
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!27 = !DILocation(line: 5, column: 3, scope: !8)
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!28 = !DILocation(line: 7, column: 1, scope: !8)
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!29 = !DILocation(line: 6, column: 3, scope: !8)
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