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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
54 lines
2.2 KiB
LLVM
54 lines
2.2 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 unsigned char c = 42;
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;
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; This file defines no functions, so just make sure we don't try to emit
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; the line table for functions of zero size.
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; X86-NOT: .section .debug$S,"rn"
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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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@c = global { i8, [63 x i8] } { i8 42, [63 x i8] zeroinitializer }, align 32
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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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@__asan_gen_ = private constant [7 x i8] c"asan.c\00", align 1
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@__asan_gen_1 = private unnamed_addr constant [2 x i8] c"c\00", align 1
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@0 = internal global [1 x { i32, i32, i32, i32, i32, i32 }] [{ i32, i32, i32, i32, i32, i32 } { i32 ptrtoint ({ i8, [63 x i8] }* @c to i32), i32 1, i32 64, i32 ptrtoint ([2 x i8]* @__asan_gen_1 to i32), i32 ptrtoint ([7 x i8]* @__asan_gen_ to i32), i32 0 }]
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@llvm.global_dtors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_dtor }]
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define internal void @asan.module_ctor() {
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call void @__asan_init_v3()
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call void @__asan_register_globals(i32 ptrtoint ([1 x { i32, i32, i32, i32, i32, i32 }]* @0 to i32), i32 1)
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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_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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define internal void @asan.module_dtor() {
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call void @__asan_unregister_globals(i32 ptrtoint ([1 x { i32, i32, i32, i32, i32, i32 }]* @0 to i32), i32 1)
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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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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!3 = !{i32 2, !"CodeView", i32 1}
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!4 = !{i32 1, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 3.5.0 "}
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