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460dd60c1a
so we can stop using DW_OP_bit_piece with the wrong semantics. The entire back story can be found here: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20161114/405934.html The gist is that in LLVM we've been misinterpreting DW_OP_bit_piece's offset field to mean the offset into the source variable rather than the offset into the location at the top the DWARF expression stack. In order to be able to fix this in a subsequent patch, this patch introduces a dedicated DW_OP_LLVM_fragment operation with the semantics that we used to apply to DW_OP_bit_piece, which is what we actually need while inside of LLVM. This patch is complete with a bitcode upgrade for expressions using the old format. It does not yet fix the DWARF backend to use DW_OP_bit_piece correctly. Implementation note: We discussed several options for implementing this, including reserving a dedicated field in DIExpression for the fragment size and offset, but using an custom operator at the end of the expression works just fine and is more efficient because we then only pay for it when we need it. Differential Revision: https://reviews.llvm.org/D27361 rdar://problem/29335809 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288683 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
2.9 KiB
LLVM
60 lines
2.9 KiB
LLVM
; RUN: opt -sroa -S -o - %s | FileCheck %s
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; REQUIRES: object-emission
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target datalayout = "e-m:o-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7-apple-unknown-macho"
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; generated from (-triple thumbv7-apple-unknown-macho):
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; void f(_Complex double c) { c = 0; }
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; Function Attrs: nounwind
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define arm_aapcscc void @f([2 x i64] %c.coerce) #0 !dbg !4 {
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entry:
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%c = alloca { double, double }, align 8
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%0 = bitcast { double, double }* %c to [2 x i64]*
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store [2 x i64] %c.coerce, [2 x i64]* %0, align 8
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call void @llvm.dbg.declare(metadata { double, double }* %c, metadata !14, metadata !15), !dbg !16
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%c.realp = getelementptr inbounds { double, double }, { double, double }* %c, i32 0, i32 0, !dbg !17
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%c.imagp = getelementptr inbounds { double, double }, { double, double }* %c, i32 0, i32 1, !dbg !17
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store double 0.000000e+00, double* %c.realp, align 8, !dbg !17
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; SROA will split the complex double into two i64 values, because there is
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; no native double data type available.
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; Test that debug info for both values survives:
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; CHECK: call void @llvm.dbg.value(metadata i64 0, i64 0,
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; CHECK-SAME: metadata ![[C:.*]], metadata ![[REAL:.*]])
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store double 0.000000e+00, double* %c.imagp, align 8, !dbg !17
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; CHECK: call void @llvm.dbg.value(metadata i64 0, i64 0,
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; CHECK-SAME: metadata ![[C]], metadata ![[IMG:.*]])
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ret void, !dbg !18
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}
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; CHECK: ![[REAL]] = !DIExpression(DW_OP_LLVM_fragment, 0, 64)
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; CHECK: ![[IMG]] = !DIExpression(DW_OP_LLVM_fragment, 64, 64)
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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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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10, !11, !12}
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!llvm.ident = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 259998) (llvm/trunk 259999)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "/")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", scope: !5, file: !5, line: 1, type: !6, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "/")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIBasicType(name: "complex", size: 128, align: 64, encoding: DW_ATE_complex_float)
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!9 = !{i32 2, !"Dwarf Version", i32 2}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{i32 1, !"wchar_size", i32 4}
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!12 = !{i32 1, !"min_enum_size", i32 4}
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!13 = !{!"clang version 3.9.0 (trunk 259998) (llvm/trunk 259999)"}
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!14 = !DILocalVariable(name: "c", arg: 1, scope: !4, file: !5, line: 1, type: !8)
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!15 = !DIExpression()
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!16 = !DILocation(line: 1, column: 24, scope: !4)
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!17 = !DILocation(line: 1, column: 31, scope: !4)
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!18 = !DILocation(line: 1, column: 36, scope: !4)
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