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5b721561aa
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
85 lines
3.6 KiB
LLVM
85 lines
3.6 KiB
LLVM
; Test dwarf codegen of DW_OP_minus.
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; RUN: llc -O0 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
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; This was built by compiling the following source with SafeStack and
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; simplifying the result a little.
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; extern "C" {
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; void Capture(int *);
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; void f() {
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; int buf[100];
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; Capture(buf);
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; }
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; }
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; The interesting part is !DIExpression(DW_OP_deref, DW_OP_minus, 400)
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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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@__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8*
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define void @f() !dbg !4 {
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entry:
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%unsafe_stack_ptr = load i8*, i8** @__safestack_unsafe_stack_ptr
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%unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400
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store i8* %unsafe_stack_static_top, i8** @__safestack_unsafe_stack_ptr
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%0 = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400
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%buf = bitcast i8* %0 to [100 x i32]*
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%1 = bitcast [100 x i32]* %buf to i8*, !dbg !16
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call void @llvm.dbg.declare(metadata i8* %unsafe_stack_ptr, metadata !8, metadata !17), !dbg !18
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%arraydecay = getelementptr inbounds [100 x i32], [100 x i32]* %buf, i64 0, i64 0, !dbg !19
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call void @Capture(i32* %arraydecay), !dbg !20
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store i8* %unsafe_stack_ptr, i8** @__safestack_unsafe_stack_ptr, !dbg !21
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ret void, !dbg !21
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @Capture(i32*)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3)
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!1 = !DIFile(filename: "1.cc", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !5, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, variables: !7)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{!8}
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!8 = !DILocalVariable(name: "buf", scope: !4, file: !1, line: 5, type: !9)
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!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 3200, align: 32, elements: !11)
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!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DISubrange(count: 100)
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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 3.8.0 (trunk 248518) (llvm/trunk 248512)"}
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!16 = !DILocation(line: 5, column: 3, scope: !4)
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!17 = !DIExpression(DW_OP_deref, DW_OP_minus, 400)
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!18 = !DILocation(line: 5, column: 7, scope: !4)
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!19 = !DILocation(line: 6, column: 11, scope: !4)
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!20 = !DILocation(line: 6, column: 3, scope: !4)
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!21 = !DILocation(line: 7, column: 1, scope: !4)
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; RCX - 400
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; CHECK: .short 6 # Loc expr size
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; CHECK-NEXT: .byte 114 # DW_OP_breg2
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; CHECK-NEXT: .byte 0 # 0
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; CHECK-NEXT: .byte 16 # DW_OP_constu
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; CHECK-NEXT: .byte 144 # 400
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; CHECK-NEXT: .byte 3 # DW_OP_minus
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; CHECK-NEXT: .byte 28
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; RCX is clobbered in call @Capture, but there is a spilled copy.
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; *(RSP + 8) - 400
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; CHECK: .short 7 # Loc expr size
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; CHECK-NEXT: .byte 119 # DW_OP_breg7
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; CHECK-NEXT: .byte 8 # 8
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; CHECK-NEXT: .byte 6 # DW_OP_deref
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; CHECK-NEXT: .byte 16 # DW_OP_constu
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; CHECK-NEXT: .byte 144 # 400
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; CHECK-NEXT: .byte 3 # DW_OP_minus
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; CHECK-NEXT: .byte 28
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