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0a592fd282
Summary:
This support is needed for the Fortran array variables with pointer/allocatable
attribute. This support enables debugger to identify the status of variable
whether that is currently allocated/associated.
for pointer array (before allocation/association)
without DW_AT_associated
(gdb) pt ptr
type = integer (140737345375288:140737354129776)
(gdb) p ptr
value requires 35017956 bytes, which is more than max-value-size
with DW_AT_associated
(gdb) pt ptr
type = integer (:)
(gdb) p ptr
$1 = <not associated>
for allocatable array (before allocation)
without DW_AT_allocated
(gdb) pt arr
type = integer (140737345375288:140737354129776)
(gdb) p arr
value requires 35017956 bytes, which is more than max-value-size
with DW_AT_allocated
(gdb) pt arr
type = integer, allocatable (:)
(gdb) p arr
$1 = <not allocated>
Testing
- unit test cases added
- check-llvm
- check-debuginfo
Reviewed By: aprantl
Differential Revision: https://reviews.llvm.org/D83544
57 lines
2.5 KiB
LLVM
57 lines
2.5 KiB
LLVM
; RUN: llc %s -O2 -filetype=obj -o %t.o
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; RUN: llvm-dwarfdump %t.o | FileCheck %s
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; Test whether DW_AT_data_location is generated.
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; CHECK-LABEL: DW_TAG_array_type
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_associated (DW_OP_push_object_address, DW_OP_deref)
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; CHECK: DW_TAG_subrange_type
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; Test case is hand written with the help of below testcase
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;------------------------------
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;program main
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;integer, pointer :: arr(:)
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;allocate(arr(2:20))
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;arr(2)=99
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;print *, arr
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;end program main
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;------------------------------
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; ModuleID = 'associated.ll'
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source_filename = "associated.ll"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @MAIN_() !dbg !5 {
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L.entry:
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%.Z0640_333 = alloca i32*, align 8
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%"arr$sd1_349" = alloca [16 x i64], align 8
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call void @llvm.dbg.declare(metadata [16 x i64]* %"arr$sd1_349", metadata !8, metadata !DIExpression()), !dbg !13
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call void @llvm.dbg.declare(metadata i32** %.Z0640_333, metadata !14, metadata !DIExpression()), !dbg !13
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ret void, !dbg !16
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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!llvm.module.flags = !{!0, !1}
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!llvm.dbg.cu = !{!2}
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!0 = !{i32 2, !"Dwarf Version", i32 4}
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!1 = !{i32 2, !"Debug Info Version", i32 3}
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!2 = distinct !DICompileUnit(language: DW_LANG_Fortran90, file: !3, producer: " F90 Flang - 1.5 2017-05-01", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !4, globals: !4, imports: !4)
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!3 = !DIFile(filename: "associated.f90", directory: "/dir")
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!4 = !{}
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!5 = distinct !DISubprogram(name: "main", scope: !2, file: !3, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagMainSubprogram, unit: !2)
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!6 = !DISubroutineType(cc: DW_CC_program, types: !7)
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!7 = !{null}
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!8 = !DILocalVariable(name: "arr", scope: !5, file: !3, type: !9)
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!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 32, align: 32, elements: !11, dataLocation: !DIExpression(DW_OP_push_object_address, DW_OP_deref), associated: !DIExpression(DW_OP_push_object_address, DW_OP_deref))
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!10 = !DIBasicType(name: "integer", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DISubrange(count: 19, lowerBound: 2)
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!13 = !DILocation(line: 0, scope: !5)
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!14 = distinct !DILocalVariable(scope: !5, file: !3, type: !15, flags: DIFlagArtificial)
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!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 32, align: 32)
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!16 = !DILocation(line: 6, column: 1, scope: !5)
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