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5b721561aa
Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
85 lines
3.6 KiB
LLVM
85 lines
3.6 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-dump=line - | FileCheck %s
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; RUN: %llc_dwarf < %s -filetype=asm | FileCheck --check-prefix=ASM %s
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; If multiple line tables are emitted, one per CU, those line tables can
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; unambiguously rely on the comp_dir of their owning CU and use directory '0'
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; to refer to it.
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; CHECK: .debug_line contents:
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; CHECK-NEXT: Line table prologue:
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; CHECK-NOT: include_directories
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; CHECK: file_names[ 1] 0 {{.*}} a.cpp
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; CHECK-NOT: file_names
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; CHECK: Line table prologue:
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; CHECK-NOT: include_directories
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; CHECK: file_names[ 1] 0 {{.*}} b.cpp
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; CHECK-NOT: file_names
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; However, if a single line table is emitted and shared between CUs, the
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; comp_dir is ambiguous and relying on it would lead to different path
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; interpretations depending on which CU lead to the table - so ensure that
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; full paths are always emitted in this case, never comp_dir relative.
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; ASM: .file 1 "/tmp/dbginfo/a{{[/\\]+}}a.cpp"
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; ASM: .file 2 "/tmp/dbginfo/b{{[/\\]+}}b.cpp"
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; Generated from the following source compiled to bitcode from within their
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; respective directories (with debug info) and linked together with llvm-link
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; a/a.cpp
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; void func() {
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; }
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; b/b.cpp
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; void func();
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; int main() {
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; func();
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; }
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; Function Attrs: nounwind uwtable
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define void @_Z4funcv() #0 !dbg !4 {
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entry:
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ret void, !dbg !19
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}
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; Function Attrs: uwtable
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define i32 @main() #1 !dbg !11 {
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entry:
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call void @_Z4funcv(), !dbg !20
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ret i32 0, !dbg !21
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}
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attributes #0 = { nounwind uwtable "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 = { uwtable "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, !8}
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!llvm.module.flags = !{!16, !17}
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!llvm.ident = !{!18, !18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo/a")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "func", linkageName: "_Z4funcv", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo/a")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !9, enums: !2, retainedTypes: !2, subprograms: !10, globals: !2, imports: !2)
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!9 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo/b")
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!10 = !{!11}
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!11 = distinct !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !9, scope: !12, type: !13, variables: !2)
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!12 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo/b")
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!13 = !DISubroutineType(types: !14)
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!14 = !{!15}
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!15 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 1, !"Debug Info Version", i32 3}
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!18 = !{!"clang version 3.5.0 "}
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!19 = !DILocation(line: 2, scope: !4)
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!20 = !DILocation(line: 3, scope: !11)
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!21 = !DILocation(line: 4, scope: !11)
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