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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
91 lines
3.8 KiB
LLVM
91 lines
3.8 KiB
LLVM
; RUN: opt %s -sroa -verify -S -o - | FileCheck %s
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; From:
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; struct prog_src_register {
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; unsigned : 4;
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; int Index : 12 + 1;
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; unsigned : 12;
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; unsigned : 4;
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; int : 12 + 1
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; } src_reg_for_float() {
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; struct prog_src_register a;
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; memset(&a, 0, sizeof(a));
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; int local = a.Index;
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; return a;
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; }
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; ModuleID = 'pr22495.c'
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; When SROA is creating new smaller allocas, it may add padding.
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;
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; There should be no debug info for the padding.
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; CHECK-NOT: DW_OP_bit_piece, 56
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; CHECK: DIExpression(DW_OP_bit_piece, 32, 24)
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; CHECK-NOT: DW_OP_bit_piece, 56
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; CHECK: DIExpression(DW_OP_bit_piece, 0, 32)
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; CHECK-NOT: DW_OP_bit_piece, 56
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%struct.prog_src_register = type { i32, i24 }
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; Function Attrs: nounwind
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define i64 @src_reg_for_float() #0 !dbg !4 {
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entry:
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%retval = alloca %struct.prog_src_register, align 4
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%a = alloca %struct.prog_src_register, align 4
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%local = alloca i32, align 4
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call void @llvm.dbg.declare(metadata %struct.prog_src_register* %a, metadata !16, metadata !17), !dbg !18
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%0 = bitcast %struct.prog_src_register* %a to i8*, !dbg !19
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call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 8, i32 4, i1 false), !dbg !19
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call void @llvm.dbg.declare(metadata i32* %local, metadata !20, metadata !17), !dbg !21
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%1 = bitcast %struct.prog_src_register* %a to i32*, !dbg !21
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%bf.load = load i32, i32* %1, align 4, !dbg !21
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%bf.shl = shl i32 %bf.load, 15, !dbg !21
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%bf.ashr = ashr i32 %bf.shl, 19, !dbg !21
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store i32 %bf.ashr, i32* %local, align 4, !dbg !21
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%2 = bitcast %struct.prog_src_register* %retval to i8*, !dbg !22
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%3 = bitcast %struct.prog_src_register* %a to i8*, !dbg !22
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %2, i8* %3, i64 8, i32 4, i1 false), !dbg !22
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%4 = bitcast %struct.prog_src_register* %retval to i64*, !dbg !22
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%5 = load i64, i64* %4, align 1, !dbg !22
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ret i64 %5, !dbg !22
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #2
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; Function Attrs: nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "src_reg_for_float", line: 7, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 7, file: !5, scope: !6, type: !7, variables: !2)
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!5 = !DIFile(filename: "pr22495.c", directory: "")
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!6 = !DIFile(filename: "pr22495.c", directory: "")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "prog_src_register", line: 1, size: 64, align: 32, file: !5, elements: !10)
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!10 = !{!11}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "Index", line: 3, size: 13, align: 32, offset: 4, file: !5, scope: !9, baseType: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !{i32 2, !"Dwarf Version", i32 4}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.7.0 "}
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!16 = !DILocalVariable(name: "a", line: 8, scope: !4, file: !6, type: !9)
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!17 = !DIExpression()
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!18 = !DILocation(line: 8, scope: !4)
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!19 = !DILocation(line: 9, scope: !4)
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!20 = !DILocalVariable(name: "local", line: 10, scope: !4, file: !6, type: !12)
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!21 = !DILocation(line: 10, scope: !4)
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!22 = !DILocation(line: 11, scope: !4)
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