[DEBUGINFO] Add flag -no-dwarf-pub-sections to disable pub sections.

Summary:
Added a flag -no-dwarf-pub-sections, which allows to disable
emission of DWARF public sections.

Reviewers: probinson, echristo

Subscribers: aprantl, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D44385

llvm-svn: 327994

3 files changed, 15 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 713a9763a7f..0ff1b5004d9 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -851,7 +851,8 @@ bool DwarfCompileUnit::hasDwarfPubSections() const {
   if (CUNode->getGnuPubnames())
     return true;
 
-  return DD->tuneForGDB() && !includeMinimalInlineScopes();
+  return DD->tuneForGDB() && DD->usePubSections() &&
+         !includeMinimalInlineScopes();
 }
 
 /// addGlobalName - Add a new global name to the compile unit.
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index a1e9a01e72b..b9a17d5018c 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -123,6 +123,11 @@ DwarfInlinedStrings("dwarf-inlined-strings", cl::Hidden,
                             clEnumVal(Disable, "Disabled")),
                  cl::init(Default));
 
+static cl::opt<bool>
+    NoDwarfPubSections("no-dwarf-pub-sections", cl::Hidden,
+                       cl::desc("Disable emission of DWARF pub sections."),
+                       cl::init(false));
+
 enum LinkageNameOption {
   DefaultLinkageNames,
   AllLinkageNames,
@@ -310,6 +315,8 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
   // Use dwarf 4 by default if nothing is requested.
   DwarfVersion = DwarfVersion ? DwarfVersion : dwarf::DWARF_VERSION;
 
+  UsePubSections = !NoDwarfPubSections;
+
   // Work around a GDB bug. GDB doesn't support the standard opcode;
   // SCE doesn't support GNU's; LLDB prefers the standard opcode, which
   // is defined as of DWARF 3.
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index c8a36baffe3..56a1d633729 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -258,6 +258,9 @@ class DwarfDebug : public DebugHandlerBase {
   /// Use inlined strings.
   bool UseInlineStrings = false;
 
+  /// Whether to emit DWARF pub sections or not.
+  bool UsePubSections = true;
+
   /// DWARF5 Experimental Options
   /// @{
   bool HasDwarfAccelTables;
@@ -501,6 +504,9 @@ public:
   /// Returns whether to use inline strings.
   bool useInlineStrings() const { return UseInlineStrings; }
 
+  /// Returns whether GNU oub sections should be emitted.
+  bool usePubSections() const { return UsePubSections; }
+
   // Experimental DWARF5 features.
 
   /// Returns whether or not to emit tables that dwarf consumers can