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llvm-mirror/test/DebugInfo/X86/nophysreg.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

203 lines
9.2 KiB
LLVM
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; RUN: llc -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
;
; PR22296: In this testcase the DBG_VALUE describing "p5" becomes unavailable
; because the register its address is in is clobbered and we (currently) aren't
; smart enough to realize that the value is rematerialized immediately after the
; DBG_VALUE and/or is actually a stack slot.
;
; Test that we handle this situation gracefully by omitting the DW_AT_location
; and not asserting.
; Note that this check may XPASS in the future if DbgValueHistoryCalculator
; becoms smarter. That would be fine, too.
;
; CHECK: DW_TAG_subprogram
; CHECK: linkage_name{{.*}}_Z2f21A
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_AT_location
; CHECK-NEXT: DW_AT_name {{.*}}"p5"
;
; // Compile at -O1
; struct A {
; int *m1;
; int m2;
; };
;
; void f1(int *p1, int p2);
; void __attribute__((always_inline)) f2(A p5) { f1(p5.m1, p5.m2); }
;
; void func(void*);
; void func(const int &, const int&);
; int cond();
; void f() {
; while (cond()) {
; int x;
; func(x, 0);
; while (cond()) {
; char y;
; func(&y);
; char j;
; func(&j);
; char I;
; func(&I);
; func(0, 0);
; A g;
; g.m1 = &x;
; f2(g);
; }
; }
; }
; ModuleID = 'test.cpp'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.10.0"
%struct.A = type { i32*, i32 }
; Function Attrs: alwaysinline ssp uwtable
define void @_Z2f21A(i32* %p5.coerce0, i32 %p5.coerce1) #0 !dbg !11 {
entry:
tail call void @llvm.dbg.value(metadata i32* %p5.coerce0, i64 0, metadata !16, metadata !33), !dbg !34
tail call void @llvm.dbg.value(metadata i32 %p5.coerce1, i64 0, metadata !16, metadata !35), !dbg !34
tail call void @llvm.dbg.declare(metadata %struct.A* undef, metadata !16, metadata !36), !dbg !34
tail call void @_Z2f1Pii(i32* %p5.coerce0, i32 %p5.coerce1), !dbg !37
ret void, !dbg !38
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @_Z2f1Pii(i32*, i32) #2
; Function Attrs: ssp uwtable
define void @_Z1fv() #3 !dbg !17 {
entry:
%x = alloca i32, align 4
%ref.tmp = alloca i32, align 4
%y = alloca i8, align 1
%j = alloca i8, align 1
%I = alloca i8, align 1
%ref.tmp5 = alloca i32, align 4
%ref.tmp6 = alloca i32, align 4
%call11 = call i32 @_Z4condv(), !dbg !39
%tobool12 = icmp eq i32 %call11, 0, !dbg !39
br i1 %tobool12, label %while.end7, label %while.body, !dbg !40
while.cond.loopexit: ; preds = %while.body4, %while.body
%call = call i32 @_Z4condv(), !dbg !39
%tobool = icmp eq i32 %call, 0, !dbg !39
br i1 %tobool, label %while.end7, label %while.body, !dbg !40
while.body: ; preds = %entry, %while.cond.loopexit
store i32 0, i32* %ref.tmp, align 4, !dbg !41, !tbaa !42
call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !21, metadata !DIExpression(DW_OP_deref)), !dbg !46
call void @_Z4funcRKiS0_(i32* dereferenceable(4) %x, i32* dereferenceable(4) %ref.tmp), !dbg !47
%call29 = call i32 @_Z4condv(), !dbg !48
%tobool310 = icmp eq i32 %call29, 0, !dbg !48
br i1 %tobool310, label %while.cond.loopexit, label %while.body4, !dbg !49
while.body4: ; preds = %while.body, %while.body4
call void @llvm.dbg.value(metadata i8* %y, i64 0, metadata !23, metadata !DIExpression(DW_OP_deref)), !dbg !50
call void @_Z4funcPv(i8* %y), !dbg !51
call void @llvm.dbg.value(metadata i8* %j, i64 0, metadata !26, metadata !DIExpression(DW_OP_deref)), !dbg !52
call void @_Z4funcPv(i8* %j), !dbg !53
call void @llvm.dbg.value(metadata i8* %I, i64 0, metadata !27, metadata !DIExpression(DW_OP_deref)), !dbg !54
call void @_Z4funcPv(i8* %I), !dbg !55
store i32 0, i32* %ref.tmp5, align 4, !dbg !56, !tbaa !42
store i32 0, i32* %ref.tmp6, align 4, !dbg !57, !tbaa !42
call void @_Z4funcRKiS0_(i32* dereferenceable(4) %ref.tmp5, i32* dereferenceable(4) %ref.tmp6), !dbg !58
call void @llvm.dbg.declare(metadata %struct.A* undef, metadata !28, metadata !36), !dbg !59
call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !28, metadata !33), !dbg !59
call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !21, metadata !DIExpression(DW_OP_deref)), !dbg !46
call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !60, metadata !33), !dbg !62
call void @llvm.dbg.value(metadata i32 undef, i64 0, metadata !60, metadata !35), !dbg !62
call void @llvm.dbg.declare(metadata %struct.A* undef, metadata !60, metadata !36), !dbg !62
call void @_Z2f1Pii(i32* %x, i32 undef), !dbg !63
%call2 = call i32 @_Z4condv(), !dbg !48
%tobool3 = icmp eq i32 %call2, 0, !dbg !48
br i1 %tobool3, label %while.cond.loopexit, label %while.body4, !dbg !49
while.end7: ; preds = %while.cond.loopexit, %entry
ret void, !dbg !64
}
declare i32 @_Z4condv()
declare void @_Z4funcRKiS0_(i32* dereferenceable(4), i32* dereferenceable(4))
declare void @_Z4funcPv(i8*)
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
attributes #0 = { alwaysinline ssp uwtable }
attributes #1 = { nounwind readnone }
attributes #3 = { ssp uwtable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!29, !30, !31}
!llvm.ident = !{!32}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 227088) (llvm/trunk 227091)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "test.cpp", directory: "")
!2 = !{}
!3 = !{!4}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", line: 1, size: 128, align: 64, file: !1, elements: !5, identifier: "_ZTS1A")
!5 = !{!6, !9}
!6 = !DIDerivedType(tag: DW_TAG_member, name: "m1", line: 2, size: 64, align: 64, file: !1, scope: !4, baseType: !7)
!7 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, 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: "m2", line: 3, size: 32, align: 32, offset: 64, file: !1, scope: !4, baseType: !8)
!11 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f21A", line: 7, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 7, file: !1, scope: !12, type: !13, variables: !15)
!12 = !DIFile(filename: "test.cpp", directory: "")
!13 = !DISubroutineType(types: !14)
!14 = !{null, !4}
!15 = !{!16}
!16 = !DILocalVariable(name: "p5", line: 7, arg: 1, scope: !11, file: !12, type: !4)
!17 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", line: 12, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 12, file: !1, scope: !12, type: !18, variables: !20)
!18 = !DISubroutineType(types: !19)
!19 = !{null}
!20 = !{!21, !23, !26, !27, !28}
!21 = !DILocalVariable(name: "x", line: 14, scope: !22, file: !12, type: !8)
!22 = distinct !DILexicalBlock(line: 13, column: 18, file: !1, scope: !17)
!23 = !DILocalVariable(name: "y", line: 17, scope: !24, file: !12, type: !25)
!24 = distinct !DILexicalBlock(line: 16, column: 20, file: !1, scope: !22)
!25 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!26 = !DILocalVariable(name: "j", line: 19, scope: !24, file: !12, type: !25)
!27 = !DILocalVariable(name: "I", line: 21, scope: !24, file: !12, type: !25)
!28 = !DILocalVariable(name: "g", line: 24, scope: !24, file: !12, type: !4)
!29 = !{i32 2, !"Dwarf Version", i32 2}
!30 = !{i32 2, !"Debug Info Version", i32 3}
!31 = !{i32 1, !"PIC Level", i32 2}
!32 = !{!"clang version 3.7.0 (trunk 227088) (llvm/trunk 227091)"}
!33 = !DIExpression(DW_OP_LLVM_fragment, 0, 8)
!34 = !DILocation(line: 7, column: 42, scope: !11)
!35 = !DIExpression(DW_OP_LLVM_fragment, 8, 4)
!36 = !DIExpression()
!37 = !DILocation(line: 7, column: 48, scope: !11)
!38 = !DILocation(line: 7, column: 66, scope: !11)
!39 = !DILocation(line: 13, column: 10, scope: !17)
!40 = !DILocation(line: 13, column: 3, scope: !17)
!41 = !DILocation(line: 15, column: 13, scope: !22)
!42 = !{!43, !43, i64 0}
!43 = !{!"int", !44, i64 0}
!44 = !{!"omnipotent char", !45, i64 0}
!45 = !{!"Simple C/C++ TBAA"}
!46 = !DILocation(line: 14, column: 9, scope: !22)
!47 = !DILocation(line: 15, column: 5, scope: !22)
!48 = !DILocation(line: 16, column: 12, scope: !22)
!49 = !DILocation(line: 16, column: 5, scope: !22)
!50 = !DILocation(line: 17, column: 12, scope: !24)
!51 = !DILocation(line: 18, column: 7, scope: !24)
!52 = !DILocation(line: 19, column: 12, scope: !24)
!53 = !DILocation(line: 20, column: 7, scope: !24)
!54 = !DILocation(line: 21, column: 12, scope: !24)
!55 = !DILocation(line: 22, column: 7, scope: !24)
!56 = !DILocation(line: 23, column: 12, scope: !24)
!57 = !DILocation(line: 23, column: 15, scope: !24)
!58 = !DILocation(line: 23, column: 7, scope: !24)
!59 = !DILocation(line: 24, column: 9, scope: !24)
!60 = !DILocalVariable(name: "p5", line: 7, arg: 1, scope: !11, file: !12, type: !4)
!61 = distinct !DILocation(line: 26, column: 7, scope: !24)
!62 = !DILocation(line: 7, column: 42, scope: !11, inlinedAt: !61)
!63 = !DILocation(line: 7, column: 48, scope: !11, inlinedAt: !61)
!64 = !DILocation(line: 29, column: 1, scope: !17)
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