[PATCH] D100440: [Debug-Info] DW_AT_export_symbols shouldn't be generated before version-5 of DWARF.

[EsmeYi via Phabricator via llvm-commits]

Esme updated this revision to Diff 338802.
Esme added a comment.

use strict dwarf flag instead of DBX debugger


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D100440/new/

https://reviews.llvm.org/D100440

Files:
  llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
  llvm/test/DebugInfo/PowerPC/export-symbol.ll


Index: llvm/test/DebugInfo/PowerPC/export-symbol.ll
===================================================================
--- llvm/test/DebugInfo/PowerPC/export-symbol.ll
+++ llvm/test/DebugInfo/PowerPC/export-symbol.ll
@@ -0,0 +1,34 @@
+; RUN: %llc_dwarf -O0 -filetype=obj -mtriple=powerpc64le-unknown-linux-gnu < %s | \
+; RUN:   llvm-dwarfdump -debug-info - | FileCheck %s
+; RUN: %llc_dwarf -O0 -filetype=obj -mtriple=powerpc64le-unknown-linux-gnu \
+; RUN:   -strict-dwarf=true < %s | llvm-dwarfdump -debug-info - | \
+; RUN:   FileCheck %s --check-prefix=STRICT
+
+; CHECK: DW_AT_export_symbols
+; STRICT-NOT: DW_AT_export_symbols
+
+%struct.A = type { %struct.anon }
+%struct.anon = type { i32 }
+
+ at a = global %struct.A zeroinitializer, align 4, !dbg !0
+
+!llvm.module.flags = !{!14, !15}
+!llvm.dbg.cu = !{!2}
+!llvm.ident = !{!16}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 5, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: GNU)
+!3 = !DIFile(filename: "simple_anon_class.cpp", directory: "/dir")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !3, line: 1, size: 32, flags: DIFlagTypePassByValue, elements: !7, identifier: "_ZTS1A")
+!7 = !{!8}
+!8 = !DIDerivedType(tag: DW_TAG_member, scope: !6, file: !3, line: 2, baseType: !9, size: 32)
+!9 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !6, file: !3, line: 2, size: 32, flags: DIFlagExportSymbols | DIFlagTypePassByValue, elements: !10, identifier: "_ZTSN1AUt_E")
+!10 = !{!11}
+!11 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !9, file: !3, line: 3, baseType: !12, size: 32)
+!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!14 = !{i32 2, !"Dwarf Version", i32 4}
+!15 = !{i32 2, !"Debug Info Version", i32 3}
+!16 = !{!"clang version 10.0.0"}
Index: llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -36,6 +36,7 @@
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
 #include <cassert>
 #include <cstdint>
 #include <string>
@@ -930,7 +931,8 @@
     if (CTy->isAppleBlockExtension())
       addFlag(Buffer, dwarf::DW_AT_APPLE_block);
 
-    if (CTy->getExportSymbols())
+    if (CTy->getExportSymbols() &&
+        (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5))
       addFlag(Buffer, dwarf::DW_AT_export_symbols);
 
     // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
@@ -1064,7 +1066,8 @@
     Name = "(anonymous namespace)";
   DD->addAccelNamespace(*CUNode, Name, NDie);
   addGlobalName(Name, NDie, NS->getScope());
-  if (NS->getExportSymbols())
+  if (NS->getExportSymbols() &&
+      (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5))
     addFlag(NDie, dwarf::DW_AT_export_symbols);
   return &NDie;
 }


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