[DEBUGINFO] Add option that allows to disable emission of flags in .loc directives.

Summary:
Some targets do not support extended format of .loc directive and
support only simple format: .loc <FileID> <Line> <Column>. Patch adds
MCAsmInfo flag and option that allows emit .loc directive without
additional flags.

Reviewers: echristo

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D45184

llvm-svn: 329089

1 files changed, 73 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/extended-loc-directive.ll b/llvm/test/DebugInfo/Generic/extended-loc-directive.ll
new file mode 100644
index 00000000000..2ffa7c6f91d
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/extended-loc-directive.ll
@@ -0,0 +1,73 @@
+; RUN: llc -filetype=asm -asm-verbose=0 -O0 -dwarf-extended-loc=Enable < %s | FileCheck %s --check-prefix ENABLED --check-prefix CHECK
+; RUN: llc -filetype=asm -asm-verbose=0 -O0 -dwarf-extended-loc=Disable < %s | FileCheck %s --check-prefix DISABLED --check-prefix CHECK
+
+; Check that the assembly output properly handles is_stmt changes. And since
+; we're testing anyway, check the integrated assembler too.
+
+; Generated with clang from multiline.c:
+; void f1();
+; void f2() {
+;   f1(); f1(); f1();
+;   f1(); f1(); f1();
+; }
+
+
+; CHECK: .loc 1 2 0{{$}}
+; CHECK-NOT: .loc{{ }}
+; ENABLED: .loc 1 3 3 prologue_end{{$}}
+; DISABLED: .loc 1 3 3{{$}}
+; CHECK-NOT: .loc
+; ENABLED: .loc 1 3 9 is_stmt 0{{$}}
+; DISABLED: .loc 1 3 9{{$}}
+; CHECK-NOT: .loc
+; CHECK: .loc 1 3 15{{$}}
+; CHECK-NOT: .loc
+; ENABLED: .loc 1 4 3 is_stmt 1{{$}}
+; DISABLED: .loc 1 4 3{{$}}
+; CHECK-NOT: .loc
+; ENABLED: .loc 1 4 9 is_stmt 0{{$}}
+; DISABLED: .loc 1 4 9{{$}}
+; CHECK-NOT: .loc
+; CHECK: .loc 1 4 15{{$}}
+; CHECK-NOT: .loc
+; ENABLED: .loc 1 5 1 is_stmt 1{{$}}
+; DISABLED: .loc 1 5 1{{$}}
+
+; Function Attrs: nounwind uwtable
+define void @f2() #0 !dbg !4 {
+entry:
+  call void (...) @f1(), !dbg !11
+  call void (...) @f1(), !dbg !12
+  call void (...) @f1(), !dbg !13
+  call void (...) @f1(), !dbg !14
+  call void (...) @f1(), !dbg !15
+  call void (...) @f1(), !dbg !16
+  ret void, !dbg !17
+}
+
+declare void @f1(...) #1
+
+attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!8, !9}
+!llvm.ident = !{!10}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 (trunk 225000) (llvm/trunk 224999)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
+!1 = !DIFile(filename: "multiline.c", directory: "/tmp/dbginfo")
+!2 = !{}
+!4 = distinct !DISubprogram(name: "f2", line: 2, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, variables: !2)
+!5 = !DIFile(filename: "multiline.c", directory: "/tmp/dbginfo")
+!6 = !DISubroutineType(types: !7)
+!7 = !{null}
+!8 = !{i32 2, !"Dwarf Version", i32 4}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{!"clang version 3.6.0 (trunk 225000) (llvm/trunk 224999)"}
+!11 = !DILocation(line: 3, column: 3, scope: !4)
+!12 = !DILocation(line: 3, column: 9, scope: !4)
+!13 = !DILocation(line: 3, column: 15, scope: !4)
+!14 = !DILocation(line: 4, column: 3, scope: !4)
+!15 = !DILocation(line: 4, column: 9, scope: !4)
+!16 = !DILocation(line: 4, column: 15, scope: !4)
+!17 = !DILocation(line: 5, column: 1, scope: !4)