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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
95 lines
2.8 KiB
LLVM
95 lines
2.8 KiB
LLVM
; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -O0 < %s | FileCheck --check-prefix=X86 %s
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; This LL file was generated by running clang on the following code with
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; -fsanitize=address
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; D:\asan.c:
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; 1 int foo(void) {
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; 2 return 0;
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; 3 }
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; The module ctor has no debug info. All we have to do is don't crash.
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; X86: _asan.module_ctor:
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; X86-NEXT: L{{.*}}:
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; X86-NEXT: # BB
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; X86-NEXT: calll ___asan_init_v3
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; X86-NEXT: retl
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; Make sure we don't put any DWARF debug info for ASan-instrumented modules.
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; X86-NOT: DWARF
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; ModuleID = 'asan.c'
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target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
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target triple = "i686-pc-win32"
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@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
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; Function Attrs: nounwind sanitize_address
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define i32 @foo() #0 !dbg !4 {
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entry:
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ret i32 0, !dbg !10
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}
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define internal void @asan.module_ctor() {
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call void @__asan_init_v3()
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ret void
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}
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declare void @__asan_init_v3()
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declare void @__asan_report_load1(i32)
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declare void @__asan_report_load2(i32)
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declare void @__asan_report_load4(i32)
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declare void @__asan_report_load8(i32)
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declare void @__asan_report_load16(i32)
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declare void @__asan_report_store1(i32)
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declare void @__asan_report_store2(i32)
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declare void @__asan_report_store4(i32)
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declare void @__asan_report_store8(i32)
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declare void @__asan_report_store16(i32)
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declare void @__asan_report_load_n(i32, i32)
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declare void @__asan_report_store_n(i32, i32)
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declare void @__asan_handle_no_return()
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declare void @__sanitizer_cov()
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declare void @__sanitizer_ptr_cmp(i32, i32)
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declare void @__sanitizer_ptr_sub(i32, i32)
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declare void @__asan_before_dynamic_init(i32)
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declare void @__asan_after_dynamic_init()
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declare void @__asan_register_globals(i32, i32)
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declare void @__asan_unregister_globals(i32, i32)
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attributes #0 = { nounwind sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "asan.c", directory: "D:\5C")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "asan.c", directory: "D:C")
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!6 = !DISubroutineType(types: !2)
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!7 = !{i32 2, !"CodeView", i32 1}
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!8 = !{i32 1, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.5.0 "}
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!10 = !DILocation(line: 2, scope: !4)
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