[DebugInfo] Upgrade DISubrange to support Fortran dynamic arrays
This patch upgrades DISubrange to support fortran requirements.
Summary:
Below are the updates/addition of fields.
lowerBound - Now accepts signed integer or DIVariable or DIExpression,
earlier it accepted only signed integer.
upperBound - This field is now added and accepts signed interger or
DIVariable or DIExpression.
stride - This field is now added and accepts signed interger or
DIVariable or DIExpression.
This is required to describe bounds of array which are known at runtime.
Testing:
unit test cases added (hand-written)
check clang
check llvm
check debug-info
Reviewed By: aprantl
Differential Revision: https://reviews.llvm.org/D80197
diff --git a/llvm/test/DebugInfo/fortranSubrangeVar.ll b/llvm/test/DebugInfo/fortranSubrangeVar.ll
new file mode 100644
index 0000000..5ee283e
--- /dev/null
+++ b/llvm/test/DebugInfo/fortranSubrangeVar.ll
@@ -0,0 +1,62 @@
+;; This test checks DISubrange bounds for DIVariable
+
+; RUN: %llc_dwarf %s -filetype=obj -o - | llvm-dwarfdump - | FileCheck %s
+
+;; Test whether bounds are generated correctly.
+; CHECK: [[DIE1:0x.+]]: DW_TAG_variable
+; CHECK: DW_AT_location
+; CHECK-SAME: DW_OP_plus_uconst 0x70, DW_OP_deref, DW_OP_lit4, DW_OP_mul
+; CHECK: [[DIE2:0x.+]]: DW_TAG_variable
+; CHECK: DW_AT_location
+; CHECK-SAME: DW_OP_plus_uconst 0x78
+; CHECK: [[DIE3:0x.+]]: DW_TAG_variable
+; CHECK: DW_AT_location
+; CHECK-SAME: DW_OP_plus_uconst 0x50
+; CHECK: DW_TAG_subrange_type
+; CHECK: DW_AT_lower_bound ([[DIE3]])
+; CHEK-NEXT: DW_AT_upper_bound ([[DIE2]])
+; CHECK-NEXT DW_AT_byte_stride ([[DIE1]])
+
+
+; ModuleID = 'fortsubrange.ll'
+source_filename = "fortsubrange.ll"
+
+define void @MAIN_() !dbg !5 {
+L.entry:
+ %.Z0640_333 = alloca i32*, align 8
+ %"arr$sd1_349" = alloca [16 x i64], align 8
+ call void @llvm.dbg.declare(metadata i32** %.Z0640_333, metadata !8, metadata !DIExpression(DW_OP_deref)), !dbg !17
+ call void @llvm.dbg.declare(metadata [16 x i64]* %"arr$sd1_349", metadata !13, metadata !DIExpression(DW_OP_plus_uconst, 80)), !dbg !17
+ call void @llvm.dbg.value(metadata [16 x i64]* %"arr$sd1_349", metadata !16, metadata !DIExpression(DW_OP_plus_uconst, 112, DW_OP_deref, DW_OP_constu, 4, DW_OP_mul)), !dbg !17
+ call void @llvm.dbg.declare(metadata [16 x i64]* %"arr$sd1_349", metadata !15, metadata !DIExpression(DW_OP_plus_uconst, 120)), !dbg !17
+ ret void, !dbg !18
+}
+
+; Function Attrs: nounwind readnone speculatable willreturn
+declare void @llvm.dbg.declare(metadata, metadata, metadata)
+
+; Function Attrs: nounwind readnone speculatable willreturn
+declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+!llvm.module.flags = !{!0, !1}
+!llvm.dbg.cu = !{!2}
+
+!0 = !{i32 2, !"Dwarf Version", i32 4}
+!1 = !{i32 2, !"Debug Info Version", i32 3}
+!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)
+!3 = !DIFile(filename: "fortsubrange.f90", directory: "/dir")
+!4 = !{}
+!5 = distinct !DISubprogram(name: "main", scope: !2, file: !3, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagMainSubprogram, unit: !2)
+!6 = !DISubroutineType(cc: DW_CC_program, types: !7)
+!7 = !{null}
+!8 = !DILocalVariable(name: "arr", scope: !5, file: !3, type: !9)
+!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 32, align: 32, elements: !11)
+!10 = !DIBasicType(name: "integer", size: 32, align: 32, encoding: DW_ATE_signed)
+!11 = !{!12}
+!12 = !DISubrange(lowerBound: !13, upperBound: !15, stride: !16)
+!13 = distinct !DILocalVariable(scope: !5, file: !3, type: !14, flags: DIFlagArtificial)
+!14 = !DIBasicType(name: "integer*8", size: 64, align: 64, encoding: DW_ATE_signed)
+!15 = distinct !DILocalVariable(scope: !5, file: !3, type: !14, flags: DIFlagArtificial)
+!16 = distinct !DILocalVariable(scope: !5, file: !3, type: !14, flags: DIFlagArtificial)
+!17 = !DILocation(line: 0, scope: !5)
+!18 = !DILocation(line: 6, column: 1, scope: !5)