DebugInfo: Add assembly comments for debug_addr contribution header fields

llvm-svn: 350047

diff --git a/llvm/lib/CodeGen/AsmPrinter/AddressPool.cpp b/llvm/lib/CodeGen/AsmPrinter/AddressPool.cpp
index f8143b9..042243b 100644 (file)
--- a/llvm/lib/CodeGen/AsmPrinter/AddressPool.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AddressPool.cpp
@@ -31,9 +31,13 @@ void AddressPool::emitHeader(AsmPrinter &Asm, MCSection *Section) {
                   + sizeof(uint8_t)  // address_size
                   + sizeof(uint8_t)  // segment_selector_size
                   + AddrSize * Pool.size(); // entries
+  Asm.OutStreamer->AddComment("Length of contribution");
   Asm.emitInt32(Length); // TODO: Support DWARF64 format.
+  Asm.OutStreamer->AddComment("DWARF version number");
   Asm.emitInt16(Asm.getDwarfVersion());
+  Asm.OutStreamer->AddComment("Address size");
   Asm.emitInt8(AddrSize);
+  Asm.OutStreamer->AddComment("Segment selector size");
   Asm.emitInt8(0); // TODO: Support non-zero segment_selector_size.
 }
 

diff --git a/llvm/test/DebugInfo/X86/addr_comments.ll b/llvm/test/DebugInfo/X86/addr_comments.ll
new file mode 100644 (file)
index 0000000..780b379
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/addr_comments.ll
@@ -0,0 +1,33 @@
+; RUN: llc %s -mtriple=i386-unknown-linux-gnu -filetype=asm -o - | FileCheck %s
+
+; CHECK:   .section .debug_addr
+; CHECK:   .long   8 # Length of contribution
+; CHECK:   .short  5 # DWARF version number
+; CHECK:   .byte   4 # Address size
+; CHECK:   .byte   0 # Segment selector size
+; CHECK: .Laddr_table_base0:
+; CHECK:   .long   .Lfunc_begin0
+ 
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @foo() #0 !dbg !7 {
+entry:
+  ret void, !dbg !10
+}
+
+attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "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_C99, file: !1, producer: "clang version 8.0.0 (trunk 350004) (llvm/trunk 350008)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "foo.c", directory: "/usr/local/google/home/blaikie/dev/scratch")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 5}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 350004) (llvm/trunk 350008)"}
+!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!8 = !DISubroutineType(types: !9)
+!9 = !{null}
+!10 = !DILocation(line: 2, column: 1, scope: !7)