RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-24 05:23:45 +02:00
Code Issues Projects Releases Wiki Activity
ac0e540aa5
llvm-mirror/test/Transforms/Inline/alloca-dbgdeclare.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

141 lines
6.6 KiB
LLVM
Raw Blame History

; RUN: opt -inline -S < %s | FileCheck %s
; struct A {
; int arg0;
; double arg1[2];
; } a, b;
;
; void fn3(A p1) {
; if (p1.arg0)
; a = p1;
; }
;
; void fn4() { fn3(b); }
;
; void fn5() {
; while (1)
; fn4();
; }
; ModuleID = 'test.cpp'
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-apple-darwin"
%struct.A = type { i32, [2 x double] }
@a = global %struct.A zeroinitializer, align 8, !dbg !26
@b = global %struct.A zeroinitializer, align 8, !dbg !27
; Function Attrs: nounwind
declare void @_Z3fn31A(%struct.A* nocapture readonly %p1) #0
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2
; Function Attrs: nounwind
define void @_Z3fn4v() #0 !dbg !21 {
entry:
; Test that the dbg.declare is moved together with the alloca.
; CHECK: define void @_Z3fn5v()
; CHECK-NEXT: entry:
; CHECK-NEXT: %agg.tmp.sroa.3.i = alloca [20 x i8], align 4
; CHECK-NEXT: call void @llvm.dbg.declare(metadata [20 x i8]* %agg.tmp.sroa.3.i,
%agg.tmp.sroa.3 = alloca [20 x i8], align 4
tail call void @llvm.dbg.declare(metadata [20 x i8]* %agg.tmp.sroa.3, metadata !46, metadata !48), !dbg !49
%agg.tmp.sroa.0.0.copyload = load i32, i32* getelementptr inbounds (%struct.A, %struct.A* @b, i64 0, i32 0), align 8, !dbg !50
tail call void @llvm.dbg.value(metadata i32 %agg.tmp.sroa.0.0.copyload, i64 0, metadata !46, metadata !51), !dbg !49
%agg.tmp.sroa.3.0..sroa_idx = getelementptr inbounds [20 x i8], [20 x i8]* %agg.tmp.sroa.3, i64 0, i64 0, !dbg !50
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %agg.tmp.sroa.3.0..sroa_idx, i8* getelementptr (i8, i8* bitcast (%struct.A* @b to i8*), i64 4), i64 20, i32 4, i1 false), !dbg !50
tail call void @llvm.dbg.declare(metadata %struct.A* undef, metadata !46, metadata !31) #2, !dbg !49
%tobool.i = icmp eq i32 %agg.tmp.sroa.0.0.copyload, 0, !dbg !52
br i1 %tobool.i, label %_Z3fn31A.exit, label %if.then.i, !dbg !53
if.then.i: ; preds = %entry
store i32 %agg.tmp.sroa.0.0.copyload, i32* getelementptr inbounds (%struct.A, %struct.A* @a, i64 0, i32 0), align 8, !dbg !54
call void @llvm.memcpy.p0i8.p0i8.i64(i8* getelementptr (i8, i8* bitcast (%struct.A* @a to i8*), i64 4), i8* %agg.tmp.sroa.3.0..sroa_idx, i64 20, i32 4, i1 false), !dbg !54
br label %_Z3fn31A.exit, !dbg !54
_Z3fn31A.exit: ; preds = %entry, %if.then.i
ret void, !dbg !50
}
; Function Attrs: noreturn nounwind
define void @_Z3fn5v() #3 !dbg !24 {
entry:
br label %while.body, !dbg !55
while.body: ; preds = %entry, %while.body
call void @_Z3fn4v(), !dbg !56
br label %while.body, !dbg !55
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
attributes #3 = { noreturn nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!28, !29}
!llvm.ident = !{!30}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 227480) (llvm/trunk 227517)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !25, imports: !2)
!1 = !DIFile(filename: "<stdin>", directory: "")
!2 = !{}
!3 = !{!4}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", line: 1, size: 192, align: 64, file: !5, elements: !6, identifier: "_ZTS1A")
!5 = !DIFile(filename: "test.cpp", directory: "")
!6 = !{!7, !9}
!7 = !DIDerivedType(tag: DW_TAG_member, name: "arg0", line: 2, size: 32, align: 32, file: !5, scope: !4, baseType: !8)
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DIDerivedType(tag: DW_TAG_member, name: "arg1", line: 3, size: 128, align: 64, offset: 64, file: !5, scope: !4, baseType: !10)
!10 = !DICompositeType(tag: DW_TAG_array_type, size: 128, align: 64, baseType: !11, elements: !12)
!11 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
!12 = !{!13}
!13 = !DISubrange(count: 2)
!15 = distinct !DISubprogram(name: "fn3", linkageName: "_Z3fn31A", line: 6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 6, file: !5, scope: !16, type: !17, variables: !19)
!16 = !DIFile(filename: "test.cpp", directory: "")
!17 = !DISubroutineType(types: !18)
!18 = !{null, !4}
!19 = !{!20}
!20 = !DILocalVariable(name: "p1", line: 6, arg: 1, scope: !15, file: !16, type: !4)
!21 = distinct !DISubprogram(name: "fn4", linkageName: "_Z3fn4v", line: 11, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 11, file: !5, scope: !16, type: !22, variables: !2)
!22 = !DISubroutineType(types: !23)
!23 = !{null}
!24 = distinct !DISubprogram(name: "fn5", linkageName: "_Z3fn5v", line: 13, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 13, file: !5, scope: !16, type: !22, variables: !2)
!25 = !{!26, !27}
!26 = !DIGlobalVariable(name: "a", line: 4, isLocal: false, isDefinition: true, scope: null, file: !16, type: !4)
!27 = !DIGlobalVariable(name: "b", line: 4, isLocal: false, isDefinition: true, scope: null, file: !16, type: !4)
!28 = !{i32 2, !"Dwarf Version", i32 4}
!29 = !{i32 2, !"Debug Info Version", i32 3}
!30 = !{!"clang version 3.7.0 (trunk 227480) (llvm/trunk 227517)"}
!31 = !DIExpression(DW_OP_deref)
!32 = !DILocation(line: 6, scope: !15)
!33 = !DILocation(line: 7, scope: !34)
!34 = distinct !DILexicalBlock(line: 7, column: 0, file: !5, scope: !15)
!35 = !{!36, !37, i64 0}
!36 = !{!4, !37, i64 0, !38, i64 8}
!37 = !{!"int", !38, i64 0}
!38 = !{!"omnipotent char", !39, i64 0}
!39 = !{!"Simple C/C++ TBAA"}
!40 = !DILocation(line: 7, scope: !15)
!41 = !DILocation(line: 8, scope: !34)
!42 = !{i64 0, i64 4, !43, i64 8, i64 16, !44}
!43 = !{!37, !37, i64 0}
!44 = !{!38, !38, i64 0}
!45 = !DILocation(line: 9, scope: !15)
!46 = !DILocalVariable(name: "p1", line: 6, arg: 1, scope: !15, file: !16, type: !4)
!47 = distinct !DILocation(line: 11, scope: !21)
!48 = !DIExpression(DW_OP_LLVM_fragment, 32, 160)
!49 = !DILocation(line: 6, scope: !15, inlinedAt: !47)
!50 = !DILocation(line: 11, scope: !21)
!51 = !DIExpression(DW_OP_LLVM_fragment, 0, 32)
!52 = !DILocation(line: 7, scope: !34, inlinedAt: !47)
!53 = !DILocation(line: 7, scope: !15, inlinedAt: !47)
!54 = !DILocation(line: 8, scope: !34, inlinedAt: !47)
!55 = !DILocation(line: 14, scope: !24)
!56 = !DILocation(line: 15, scope: !24)
Reference in New Issue View Git Blame Copy Permalink