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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
30 lines
1.4 KiB
LLVM
30 lines
1.4 KiB
LLVM
; RUN: llvm-as < %s -o %t.bc 2>&1 >/dev/null | FileCheck -check-prefix=WARN %s
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; RUN: llvm-dis < %t.bc | FileCheck %s
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; RUN: verify-uselistorder < %t.bc
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define i32 @main() !dbg !4 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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ret i32 0, !dbg !12
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (trunk 195495) (llvm/trunk 195495:195504M)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "../llvm/tools/clang/test/CodeGen/debug-info-version.c", directory: "/Users/manmanren/llvm_gmail/release")
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!2 = !{i32 0}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "main", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "../llvm/tools/clang/test/CodeGen/debug-info-version.c", directory: "/Users/manmanren/llvm_gmail/release")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 2}
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!12 = !DILocation(line: 4, scope: !4)
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; WARN: warning: ignoring debug info with an invalid version (0)
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; CHECK-NOT: !dbg
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; CHECK-NOT: !llvm.dbg.cu
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