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llvm-project/llvm/test/CodeGen/X86/dbg-value-func-arg.ll

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[DebugInfo] Fix for DW_OP_LLVM_fragment in DIExpression::isImplicit() DIExpression::isImplicit() did not handle DW_OP_LLVM_fragment correctly. It was scanning the elements in the expression by iterating from the end. But we do not know the position of ops unless we iterate from the beginning of the expression, since DW_OP:s and their operands are stored flat in the expression list. The old code also assumed that a DW_OP_LLVM_fragment only occupied one element in the expression list, but it actually occupies three elements.
2019-11-04 00:37:34 +08:00
; RUN: llc < %s -mtriple i386-unknown-unknown -O1 -stop-before=finalize-isel | FileCheck %s
; Test case is designed to show the differences related to how implicit values
; are handled by SelectionDAGBuilder::EmitFuncArgumentDbgValue.
;
; One purpose is to validate a bugfix in DIExpression::isImplicit() related
; to DIExpressions containing both DW_OP_stack_value and DW_OP_LLVM_fragment.
;
; IR generated by:
;
; // clang -S -target i386-- -Wall -g -O1 -mllvm -stop-before=finalize-isel
;
; typedef struct {
; int x;
; int *y;
; } bar;
;
; bar* func1(bar *p1, long p2, bar p3)
; {
; bar *foo1 = p1+18;
; p3.y = &((p1+18)->x);
; return p1;
; }
target datalayout = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i386-unknown-unknown"
%struct.bar = type { i32, i32* }
; Function Attrs: norecurse nounwind readnone
define dso_local %struct.bar* @func1(%struct.bar* readnone returned %0, i32 %1, i32 %2, i32* nocapture readnone %3) local_unnamed_addr #0 !dbg !8 {
Revert "[DebugInfo] Remove some users of DBG_VALUEs IsIndirect field" This reverts commit ed29dbaafa49bb8c9039a35f768244c394411fea. I'm backing out D68945, which as the discussion for D73526 shows, doesn't seem to handle the -O0 path through the codegen backend correctly. I'll reland the patch when a fix is worked out, apologies for all the churn. The two parent commits are part of this revert too. Conflicts: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/test/DebugInfo/X86/dbg-addr-dse.ll SelectionDAGBuilder conflict is due to a nearby change in e39e2b4a79c6 that's technically unrelated. dbg-addr-dse.ll conflicted because 41206b61e30c (legitimately) changes the order of two lines. There are further modifications to dbg-value-func-arg.ll: it landed after the patch being reverted, and I've converted indirection to be represented by the isIndirect field rather than DW_OP_deref.
2020-02-06 01:27:44 +08:00
; CHECK-DAG: DBG_VALUE %fixed-stack.1, 0, {{.*}}, !DIExpression(DW_OP_LLVM_fragment, 0, 32),
; CHECK-DAG: DBG_VALUE %fixed-stack.0, 0, {{.*}}, !DIExpression(DW_OP_LLVM_fragment, 32, 32),
; CHECK-DAG: DBG_VALUE %fixed-stack.3, 0, {{.*}}, !DIExpression(),
; CHECK-DAG: DBG_VALUE %fixed-stack.2, 0, {{.*}}, !DIExpression(),
; CHECK-DAG: DBG_VALUE %fixed-stack.3, 0, {{.*}}, !DIExpression(DW_OP_plus_uconst, 144, DW_OP_stack_value),
; CHECK-DAG: DBG_VALUE %fixed-stack.3, 0, {{.*}}, !DIExpression(DW_OP_plus_uconst, 144, DW_OP_stack_value, DW_OP_LLVM_fragment, 32, 32),
[DebugInfo] Fix for DW_OP_LLVM_fragment in DIExpression::isImplicit() DIExpression::isImplicit() did not handle DW_OP_LLVM_fragment correctly. It was scanning the elements in the expression by iterating from the end. But we do not know the position of ops unless we iterate from the beginning of the expression, since DW_OP:s and their operands are stored flat in the expression list. The old code also assumed that a DW_OP_LLVM_fragment only occupied one element in the expression list, but it actually occupies three elements.
2019-11-04 00:37:34 +08:00
call void @llvm.dbg.value(metadata i32 %2, metadata !24, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !26
call void @llvm.dbg.value(metadata i32* %3, metadata !24, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !26
call void @llvm.dbg.value(metadata %struct.bar* %0, metadata !22, metadata !DIExpression()), !dbg !26
call void @llvm.dbg.value(metadata i32 %1, metadata !23, metadata !DIExpression()), !dbg !26
call void @llvm.dbg.value(metadata %struct.bar* %0, metadata !25, metadata !DIExpression(DW_OP_plus_uconst, 144, DW_OP_stack_value)), !dbg !26
call void @llvm.dbg.value(metadata %struct.bar* %0, metadata !24, metadata !DIExpression(DW_OP_plus_uconst, 144, DW_OP_stack_value, DW_OP_LLVM_fragment, 32, 32)), !dbg !26
ret %struct.bar* %0, !dbg !27
}
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { norecurse nounwind readnone }
attributes #1 = { nounwind readnone speculatable willreturn }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk 375507)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "example.c", directory: "/home/ubuntu")
!2 = !{}
!3 = !{i32 1, !"NumRegisterParameters", i32 0}
!4 = !{i32 2, !"Dwarf Version", i32 4}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = !{!"clang version 10.0.0 (trunk 375507)"}
!8 = distinct !DISubprogram(name: "func1", scope: !9, file: !9, line: 6, type: !10, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !21)
!9 = !DIFile(filename: "./example.c", directory: "/home/ubuntu")
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12, !20, !13}
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 32)
!13 = !DIDerivedType(tag: DW_TAG_typedef, name: "bar", file: !9, line: 4, baseType: !14)
!14 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !9, line: 1, size: 64, elements: !15)
!15 = !{!16, !18}
!16 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !14, file: !9, line: 2, baseType: !17, size: 32)
!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!18 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !14, file: !9, line: 3, baseType: !19, size: 32, offset: 32)
!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 32)
!20 = !DIBasicType(name: "long int", size: 32, encoding: DW_ATE_signed)
!21 = !{!22, !23, !24, !25}
!22 = !DILocalVariable(name: "p1", arg: 1, scope: !8, file: !9, line: 6, type: !12)
!23 = !DILocalVariable(name: "p2", arg: 2, scope: !8, file: !9, line: 6, type: !20)
!24 = !DILocalVariable(name: "p3", arg: 3, scope: !8, file: !9, line: 6, type: !13)
!25 = !DILocalVariable(name: "foo1", scope: !8, file: !9, line: 8, type: !12)
!26 = !DILocation(line: 0, scope: !8)
!27 = !DILocation(line: 10, column: 4, scope: !8)