Fix the type signature of DwarfExpression::Add.*Constant to support values >32 bits.

This fixes an embarrassing bug when emitting .debug_loc entries for 64-bit+ constants,
which were previously silently truncated to 32 bits.

<rdar://problem/26843232>

llvm-svn: 273736

1 files changed, 76 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/X86/constant-loclist.ll b/llvm/test/DebugInfo/X86/constant-loclist.ll
new file mode 100644
index 00000000000..ad2ad6947a8
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/constant-loclist.ll
@@ -0,0 +1,76 @@
+; RUN: %llc_dwarf -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
+
+; A hand-written testcase to check 64-bit constant handling in location lists.
+
+; CHECK: .debug_info contents:
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_location [DW_FORM_data4]	(0x[[D:.*]])
+; CHECK-NEXT: DW_AT_name {{.*}}"d"
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_location [DW_FORM_data4]	(0x[[I:.*]])
+; CHECK-NEXT: DW_AT_name {{.*}}"i"
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_location [DW_FORM_data4]	(0x[[U:.*]])
+; CHECK-NEXT: DW_AT_name {{.*}}"u"
+; CHECK: .debug_loc contents:
+; CHECK: [[D]]:
+; CHECK: Location description: 10 80 80 80 80 80 80 80 80 40
+; CHECK: [[I]]:
+; CHECK: Location description: 11 80 80 80 80 80 80 80 80 c0 00
+; CHECK: [[U]]:
+; CHECK: Location description: 10 80 80 80 80 80 80 80 80 40 
+
+source_filename = "test.c"
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx"
+
+; Function Attrs: nounwind ssp uwtable
+define void @main() #0 !dbg !7 {
+  %1 = alloca double, align 8
+  %2 = alloca i64, align 8
+  %3 = alloca i64, align 8
+  store double 2.000000e+00, double* %1, align 8, !dbg !21
+  call void @llvm.dbg.value(metadata i64 0, i64 0, metadata !22, metadata !15), !dbg !24
+  call void @llvm.dbg.value(metadata i64 0, i64 0, metadata !25, metadata !15), !dbg !27
+  call void @llvm.dbg.value(metadata double 2.000000e+00, i64 0, metadata !19, metadata !15), !dbg !21
+  store i64 4611686018427387904, i64* %2, align 8, !dbg !24
+  call void @llvm.dbg.value(metadata i64 4611686018427387904, i64 0, metadata !22, metadata !15), !dbg !24
+  call void @llvm.dbg.value(metadata i64 4611686018427387904, i64 0, metadata !25, metadata !15), !dbg !27
+  store i64 4611686018427387904, i64* %3, align 8, !dbg !27
+  ret void, !dbg !28
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
+
+
+attributes #0 = { nounwind ssp uwtable }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "test.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 2}
+!4 = !{i32 2, !"Debug Info Version", i32 00000003}
+!5 = !{i32 1, !"PIC Level", i32 2}
+!6 = !{!"clang"}
+!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!8 = !DISubroutineType(types: !{})
+!15 = !DIExpression()
+!16 = !DILocation(line: 1, column: 14, scope: !7)
+!18 = !DILocation(line: 1, column: 24, scope: !7)
+!19 = !DILocalVariable(name: "d", scope: !7, file: !1, line: 2, type: !20)
+!20 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
+!21 = !DILocation(line: 2, column: 10, scope: !7)
+!22 = !DILocalVariable(name: "u", scope: !7, file: !1, line: 3, type: !23)
+!23 = !DIBasicType(name: "long long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
+!24 = !DILocation(line: 3, column: 22, scope: !7)
+!25 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 4, type: !26)
+!26 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed)
+!27 = !DILocation(line: 4, column: 20, scope: !7)
+!28 = !DILocation(line: 5, column: 3, scope: !7)