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llvm-mirror/test/DebugInfo/X86/sroasplit-4.ll
Adrian Prantl 57907269da [DIExpression] Introduce a dedicated DW_OP_LLVM_fragment operation 
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

llvm-svn: 288683
2016-12-05 18:04:47 +00:00

146 lines
6.5 KiB
LLVM
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; RUN: opt -sroa < %s -S -o - | FileCheck %s
;
; Test that recursively splitting an alloca updates the debug info correctly.
; CHECK: %[[T:.*]] = load i64, i64* @t, align 8
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T]], i64 0, metadata ![[Y:.*]], metadata ![[P1:.*]])
; CHECK: %[[T1:.*]] = load i64, i64* @t, align 8
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T1]], i64 0, metadata ![[Y]], metadata ![[P2:.*]])
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T]], i64 0, metadata ![[R:.*]], metadata ![[P3:.*]])
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T1]], i64 0, metadata ![[R]], metadata ![[P4:.*]])
; CHECK: ![[P1]] = !DIExpression(DW_OP_LLVM_fragment, 0, 64)
; CHECK: ![[P2]] = !DIExpression(DW_OP_LLVM_fragment, 64, 64)
; CHECK: ![[P3]] = !DIExpression(DW_OP_LLVM_fragment, 192, 64)
; CHECK: ![[P4]] = !DIExpression(DW_OP_LLVM_fragment, 256, 64)
;
; struct p {
; __SIZE_TYPE__ s;
; __SIZE_TYPE__ t;
; };
;
; struct r {
; int i;
; struct p x;
; struct p y;
; };
;
; extern int call_me(struct r);
; extern int maybe();
; extern __SIZE_TYPE__ t;
;
; int test() {
; if (maybe())
; return 0;
; struct p y = {t, t};
; struct r r = {.y = y};
; return call_me(r);
; }
; ModuleID = 'pr22393.cc'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-darwin"
%struct.p = type { i64, i64 }
%struct.r = type { i32, %struct.p, %struct.p }
@t = external global i64
; Function Attrs: nounwind
define i32 @_Z4testv() #0 !dbg !17 {
entry:
%retval = alloca i32, align 4
%y = alloca %struct.p, align 8
%r = alloca %struct.r, align 8
%agg.tmp = alloca %struct.r, align 8
%call = call i32 @_Z5maybev(), !dbg !24
%tobool = icmp ne i32 %call, 0, !dbg !24
br i1 %tobool, label %if.then, label %if.end, !dbg !26
if.then: ; preds = %entry
store i32 0, i32* %retval, !dbg !27
br label %return, !dbg !27
if.end: ; preds = %entry
call void @llvm.dbg.declare(metadata %struct.p* %y, metadata !28, metadata !29), !dbg !30
%s = getelementptr inbounds %struct.p, %struct.p* %y, i32 0, i32 0, !dbg !30
%0 = load i64, i64* @t, align 8, !dbg !30
store i64 %0, i64* %s, align 8, !dbg !30
%t = getelementptr inbounds %struct.p, %struct.p* %y, i32 0, i32 1, !dbg !30
%1 = load i64, i64* @t, align 8, !dbg !30
store i64 %1, i64* %t, align 8, !dbg !30
call void @llvm.dbg.declare(metadata %struct.r* %r, metadata !31, metadata !29), !dbg !32
%i = getelementptr inbounds %struct.r, %struct.r* %r, i32 0, i32 0, !dbg !32
store i32 0, i32* %i, align 4, !dbg !32
%x = getelementptr inbounds %struct.r, %struct.r* %r, i32 0, i32 1, !dbg !32
%s1 = getelementptr inbounds %struct.p, %struct.p* %x, i32 0, i32 0, !dbg !32
store i64 0, i64* %s1, align 8, !dbg !32
%t2 = getelementptr inbounds %struct.p, %struct.p* %x, i32 0, i32 1, !dbg !32
store i64 0, i64* %t2, align 8, !dbg !32
%y3 = getelementptr inbounds %struct.r, %struct.r* %r, i32 0, i32 2, !dbg !32
%2 = bitcast %struct.p* %y3 to i8*, !dbg !32
%3 = bitcast %struct.p* %y to i8*, !dbg !32
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %2, i8* %3, i64 16, i32 8, i1 false), !dbg !32
%4 = bitcast %struct.r* %agg.tmp to i8*, !dbg !33
%5 = bitcast %struct.r* %r to i8*, !dbg !33
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %4, i8* %5, i64 40, i32 8, i1 false), !dbg !33
%call4 = call i32 @_Z7call_me1r(%struct.r* byval align 8 %agg.tmp), !dbg !33
store i32 %call4, i32* %retval, !dbg !33
br label %return, !dbg !33
return: ; preds = %if.end, %if.then
%6 = load i32, i32* %retval, !dbg !34
ret i32 %6, !dbg !34
}
declare i32 @_Z5maybev()
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
; Function Attrs: nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #3
declare i32 @_Z7call_me1r(%struct.r* byval align 8)
attributes #0 = { nounwind }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!21, !22}
!llvm.ident = !{!23}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "<stdin>", directory: "")
!2 = !{}
!3 = !{!4, !10}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "p", line: 3, size: 128, align: 64, file: !5, elements: !6, identifier: "_ZTS1p")
!5 = !DIFile(filename: "pr22393.cc", directory: "")
!6 = !{!7, !9}
!7 = !DIDerivedType(tag: DW_TAG_member, name: "s", line: 4, size: 64, align: 64, file: !5, scope: !4, baseType: !8)
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
!9 = !DIDerivedType(tag: DW_TAG_member, name: "t", line: 5, size: 64, align: 64, offset: 64, file: !5, scope: !4, baseType: !8)
!10 = !DICompositeType(tag: DW_TAG_structure_type, name: "r", line: 8, size: 320, align: 64, file: !5, elements: !11, identifier: "_ZTS1r")
!11 = !{!12, !14, !15}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 9, size: 32, align: 32, file: !5, scope: !10, baseType: !13)
!13 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!14 = !DIDerivedType(tag: DW_TAG_member, name: "x", line: 10, size: 128, align: 64, offset: 64, file: !5, scope: !10, baseType: !4)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "y", line: 11, size: 128, align: 64, offset: 192, file: !5, scope: !10, baseType: !4)
!17 = distinct !DISubprogram(name: "test", linkageName: "_Z4testv", line: 18, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 18, file: !5, scope: !18, type: !19, variables: !2)
!18 = !DIFile(filename: "pr22393.cc", directory: "")
!19 = !DISubroutineType(types: !20)
!20 = !{!13}
!21 = !{i32 2, !"Dwarf Version", i32 4}
!22 = !{i32 2, !"Debug Info Version", i32 3}
!23 = !{!"clang version 3.7.0 "}
!24 = !DILocation(line: 19, scope: !25)
!25 = distinct !DILexicalBlock(line: 19, column: 0, file: !5, scope: !17)
!26 = !DILocation(line: 19, scope: !17)
!27 = !DILocation(line: 20, scope: !25)
!28 = !DILocalVariable(name: "y", line: 21, scope: !17, file: !18, type: !4)
!29 = !DIExpression()
!30 = !DILocation(line: 21, scope: !17)
!31 = !DILocalVariable(name: "r", line: 22, scope: !17, file: !18, type: !10)
!32 = !DILocation(line: 22, scope: !17)
!33 = !DILocation(line: 23, scope: !17)
!34 = !DILocation(line: 24, scope: !17)
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