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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
68 lines
2.9 KiB
LLVM
68 lines
2.9 KiB
LLVM
; REQUIRES: object-emission
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; RUN: llc -mtriple=x86_64-linux -O0 -filetype=obj < %s \
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; RUN: | llvm-dwarfdump -debug-dump=info - | FileCheck --check-prefix=CHECK --check-prefix=CHECK-V4 %s
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; RUN: llc -mtriple=x86_64-linux -dwarf-version=3 -O0 -filetype=obj < %s \
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; RUN: | llvm-dwarfdump -debug-dump=info - | FileCheck --check-prefix=CHECK --check-prefix=CHECK-V3 %s
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; Check that we emit DW_TAG_lexical_block and that it has the right encoding
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; depending on the dwarf version.
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; CHECK: DW_TAG_lexical_block
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_low_pc [DW_FORM_addr]
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; CHECK-NOT: DW_TAG
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; CHECK-V4: DW_AT_high_pc [DW_FORM_data4]
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; CHECK-V3: DW_AT_high_pc [DW_FORM_addr]
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; Test case produced from:
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; void b() {
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; if (int i = 3)
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; return;
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; }
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; Function Attrs: nounwind uwtable
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define void @_Z1bv() #0 !dbg !4 {
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entry:
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%i = alloca i32, align 4
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call void @llvm.dbg.declare(metadata i32* %i, metadata !11, metadata !DIExpression()), !dbg !14
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store i32 3, i32* %i, align 4, !dbg !14
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%0 = load i32, i32* %i, align 4, !dbg !14
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%tobool = icmp ne i32 %0, 0, !dbg !14
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br i1 %tobool, label %if.then, label %if.end, !dbg !14
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if.then: ; preds = %entry
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br label %if.end, !dbg !15
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if.end: ; preds = %if.then, %entry
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ret void, !dbg !16
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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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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 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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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: "lexical_block.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "b", linkageName: "_Z1bv", 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: "lexical_block.cpp", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.5.0 "}
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!11 = !DILocalVariable(name: "i", line: 2, scope: !12, file: !5, type: !13)
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!12 = distinct !DILexicalBlock(line: 2, column: 0, file: !1, scope: !4)
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!13 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!14 = !DILocation(line: 2, scope: !12)
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!15 = !DILocation(line: 3, scope: !12)
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!16 = !DILocation(line: 4, scope: !4)
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