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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
24 lines
609 B
LLVM
24 lines
609 B
LLVM
; RUN: not llvm-as %s -disable-output 2>&1 | FileCheck %s
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define void @foo() !dbg !4 !dbg !4 {
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unreachable
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}
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; CHECK-NOT: !dbg
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; CHECK: function !dbg attachment must be a subprogram
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; CHECK-NEXT: void ()* @bar
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; CHECK-NEXT: !{{[0-9]+}} = !{}
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define void @bar() !dbg !6 {
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unreachable
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!llvm.dbg.cu = !{!1}
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, subprograms: !3)
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!2 = !DIFile(filename: "t.c", directory: "/path/to/dir")
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !2)
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!6 = !{}
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