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fb3abba237
Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
34 lines
1.2 KiB
LLVM
34 lines
1.2 KiB
LLVM
; RUN: llvm-as < %s > %t.bc
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; RUN: llvm-as < %p/2009-09-03-mdnode2.ll > %t2.bc
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; RUN: llvm-link %t.bc %t2.bc
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declare void @f() nounwind
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define i32 @main(...) nounwind {
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entry:
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%retval = alloca i32 ; <i32*> [#uses=2]
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call void @llvm.dbg.func.start(metadata !0)
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store i32 0, i32* %retval
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call void @llvm.dbg.stoppoint(i32 4, i32 5, metadata !1)
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call void @f()
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br label %return
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return: ; preds = %entry
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%0 = load i32, i32* %retval ; <i32> [#uses=1]
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call void @llvm.dbg.stoppoint(i32 5, i32 1, metadata !1)
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call void @llvm.dbg.region.end(metadata !0)
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ret i32 %0
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}
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declare void @llvm.dbg.func.start(metadata) nounwind readnone
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declare void @llvm.dbg.stoppoint(i32, i32, metadata) nounwind readnone
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declare void @llvm.dbg.region.end(metadata) nounwind readnone
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!llvm.dbg.cu = !{!1}
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!0 = distinct !DISubprogram(name: "main", linkageName: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !1, scope: !1)
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "ellcc 0.1.0", isOptimized: true, emissionKind: FullDebug, file: !2)
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!2 = !DIFile(filename: "a.c", directory: "/home/rich/ellcc/test/source")
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