[DEBUGINFO] Add -no-dwarf-debug-ranges option.

Summary:
Added option -no-dwarf-debug-ranges option to disable emission of
.debug_ranges section.

Reviewers: probinson, echristo

Subscribers: aprantl, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D44384

llvm-svn: 328030

1 files changed, 54 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/X86/no_debug_ranges.ll b/llvm/test/DebugInfo/X86/no_debug_ranges.ll
new file mode 100644
index 00000000000..3823c88a88e
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/no_debug_ranges.ll
@@ -0,0 +1,54 @@
+; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu < %s -o - -dwarf-version=2 -no-dwarf-ranges-section | FileCheck %s --check-prefix=DISABLED
+; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu < %s -o - -dwarf-version=2 | FileCheck %s
+
+; DISABLED-NOT:  {{DW_AT_ranges|.debug_ranges}}
+; DISABLED:      .section .debug_info
+; DISABLED-NOT:  {{DW_AT_ranges|.section}}
+; DISABLED:      .quad .Lfunc_begin0 # DW_AT_low_pc
+; DISABLED-NEXT: .quad .Lfunc_end1   # DW_AT_high_pc
+; DISABLED-NOT:  {{DW_AT_ranges|.debug_ranges}}
+
+; .debug_ranges section must be emitted by default
+; CHECK: .section .debug_info
+; CHECK: quad 0 # DW_AT_low_pc
+; CHECK-NEXT: long [[RANGE0:[.]Ldebug_ranges[0-9]+]] # DW_AT_ranges
+; CHECK: .debug_ranges
+; CHECK-NEXT: [[RANGE0]]:
+; CHECK-NEXT: .quad .Lfunc_begin0
+; CHECK-NEXT: .quad .Lfunc_end0
+; CHECK-NEXT: .quad .Lfunc_begin1
+; CHECK-NEXT: .quad .Lfunc_end1
+; CHECK-NEXT: .quad 0
+; CHECK-NEXT: .quad 0
+
+; Function Attrs: noinline nounwind optnone uwtable
+define void @_Z2f1v() #0 section "a" !dbg !7 {
+entry:
+  ret void, !dbg !10
+}
+
+; Function Attrs: noinline nounwind optnone uwtable
+define void @_Z2f2v() #0 section "b" !dbg !11 {
+entry:
+  ret void, !dbg !12
+}
+
+attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 (trunk 309523) (llvm/trunk 309526)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "funcs.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 6.0.0 (trunk 309523) (llvm/trunk 309526)"}
+!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", 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: !9)
+!9 = !{null}
+!10 = !DILocation(line: 1, column: 42, scope: !7)
+!11 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!12 = !DILocation(line: 2, column: 42, scope: !11)