Use DW_FORM_flag_present to save space in debug information if we're

not in darwin gdb compat mode.

Fixes rdar://10975088

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162526 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 41 insertions, 25 deletions

diff --git a/lib/CodeGen/AsmPrinter/DIE.cpp b/lib/CodeGen/AsmPrinter/DIE.cpp
index 3776848e3f..c55e5f7b53 100644
--- a/lib/CodeGen/AsmPrinter/DIE.cpp
+++ b/lib/CodeGen/AsmPrinter/DIE.cpp
@@ -182,6 +182,12 @@ void DIEValue::dump() {
 void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const {
   unsigned Size = ~0U;
   switch (Form) {
+  case dwarf::DW_FORM_flag_present:
+    // Emit something to keep the lines and comments in sync.
+    // FIXME: Is there a better way to do this?
+    if (Asm->OutStreamer.hasRawTextSupport())
+      Asm->OutStreamer.EmitRawText(StringRef(""));
+    return;
   case dwarf::DW_FORM_flag:  // Fall thru
   case dwarf::DW_FORM_ref1:  // Fall thru
   case dwarf::DW_FORM_data1: Size = 1; break;
@@ -203,6 +209,8 @@ void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const {
 ///
 unsigned DIEInteger::SizeOf(AsmPrinter *AP, unsigned Form) const {
   switch (Form) {
+  case dwarf::DW_FORM_flag_present: // Fall thru
+    return 0;
   case dwarf::DW_FORM_flag:  // Fall thru
   case dwarf::DW_FORM_ref1:  // Fall thru
   case dwarf::DW_FORM_data1: return sizeof(int8_t);
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 7a3eb32900..e58589719a 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -51,6 +51,15 @@ DIEEntry *CompileUnit::createDIEEntry(DIE *Entry) {
   return Value;
 }
 
+/// addFlag - Add a flag that is true.
+void CompileUnit::addFlag(DIE *Die, unsigned Attribute) {
+  if (!DD->useDarwinGDBCompat())
+    Die->addValue(Attribute, dwarf::DW_FORM_flag_present,
+                  DIEIntegerOne);
+  else
+    addUInt(Die, Attribute, dwarf::DW_FORM_flag, 1);
+}
+
 /// addUInt - Add an unsigned integer attribute data and value.
 ///
 void CompileUnit::addUInt(DIE *Die, unsigned Attribute,
@@ -794,7 +803,7 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
         (Language == dwarf::DW_LANG_C89 ||
          Language == dwarf::DW_LANG_C99 ||
          Language == dwarf::DW_LANG_ObjC))
-      addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
+      addFlag(&Buffer, dwarf::DW_AT_prototyped);
   }
     break;
   case dwarf::DW_TAG_structure_type:
@@ -825,15 +834,15 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
           addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
             dwarf::DW_ACCESS_public);
         if (SP.isExplicit())
-          addUInt(ElemDie, dwarf::DW_AT_explicit, dwarf::DW_FORM_flag, 1);
+          addFlag(ElemDie, dwarf::DW_AT_explicit);
       }
       else if (Element.isVariable()) {
         DIVariable DV(Element);
         ElemDie = new DIE(dwarf::DW_TAG_variable);
         addString(ElemDie, dwarf::DW_AT_name, DV.getName());
         addType(ElemDie, DV.getType());
-        addUInt(ElemDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
-        addUInt(ElemDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
+        addFlag(ElemDie, dwarf::DW_AT_declaration);
+        addFlag(ElemDie, dwarf::DW_AT_external);
         addSourceLine(ElemDie, DV);
       } else if (Element.isDerivedType()) {
         DIDerivedType DDTy(Element);
@@ -883,7 +892,7 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
     }
 
     if (CTy.isAppleBlockExtension())
-      addUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1);
+      addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
 
     DICompositeType ContainingType = CTy.getContainingType();
     if (DIDescriptor(ContainingType).isCompositeType())
@@ -895,8 +904,7 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
     }
 
     if (CTy.isObjcClassComplete())
-      addUInt(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type,
-              dwarf::DW_FORM_flag, 1);
+      addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
 
     // Add template parameters to a class, structure or union types.
     // FIXME: The support isn't in the metadata for this yet.
@@ -929,7 +937,7 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
 
     // If we're a forward decl, say so.
     if (CTy.isForwardDecl())
-      addUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+      addFlag(&Buffer, dwarf::DW_AT_declaration);
 
     // Add source line info if available.
     if (!CTy.isForwardDecl())
@@ -1062,7 +1070,7 @@ DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
       (Language == dwarf::DW_LANG_C89 ||
        Language == dwarf::DW_LANG_C99 ||
        Language == dwarf::DW_LANG_ObjC))
-    addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
+    addFlag(SPDie, dwarf::DW_AT_prototyped);
 
   // Add Return Type.
   DICompositeType SPTy = SP.getType();
@@ -1086,7 +1094,7 @@ DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
   }
 
   if (!SP.isDefinition()) {
-    addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+    addFlag(SPDie, dwarf::DW_AT_declaration);
     
     // Add arguments. Do not add arguments for subprogram definition. They will
     // be handled while processing variables.
@@ -1100,19 +1108,19 @@ DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
         DIType ATy = DIType(DIType(Args.getElement(i)));
         addType(Arg, ATy);
         if (ATy.isArtificial())
-          addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+          addFlag(Arg, dwarf::DW_AT_artificial);
         SPDie->addChild(Arg);
       }
   }
 
   if (SP.isArtificial())
-    addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+    addFlag(SPDie, dwarf::DW_AT_artificial);
 
   if (!SP.isLocalToUnit())
-    addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
+    addFlag(SPDie, dwarf::DW_AT_external);
 
   if (SP.isOptimized())
-    addUInt(SPDie, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
+    addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
 
   if (unsigned isa = Asm->getISAEncoding()) {
     addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
@@ -1175,7 +1183,7 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
 
   // Add scoping info.
   if (!GV.isLocalToUnit())
-    addUInt(VariableDIE, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
+    addFlag(VariableDIE, dwarf::DW_AT_external);
 
   // Add line number info.
   addSourceLine(VariableDIE, GV);
@@ -1200,8 +1208,7 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
       addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification,
                   dwarf::DW_FORM_ref4, VariableDIE);
       addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
-      addUInt(VariableDIE, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag,
-                     1);
+      addFlag(VariableDIE, dwarf::DW_AT_declaration);
       addDie(VariableSpecDIE);
     } else {
       addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
@@ -1267,7 +1274,7 @@ void CompileUnit::constructArrayTypeDIE(DIE &Buffer,
                                         DICompositeType *CTy) {
   Buffer.setTag(dwarf::DW_TAG_array_type);
   if (CTy->getTag() == dwarf::DW_TAG_vector_type)
-    addUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1);
+    addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
 
   // Emit derived type.
   addType(&Buffer, CTy->getTypeDerivedFrom());
@@ -1340,8 +1347,7 @@ DIE *CompileUnit::constructVariableDIE(DbgVariable *DV, bool isScopeAbstract) {
   }
 
   if (DV->isArtificial())
-    addUInt(VariableDie, dwarf::DW_AT_artificial,
-                        dwarf::DW_FORM_flag, 1);
+    addFlag(VariableDie, dwarf::DW_AT_artificial);
 
   if (isScopeAbstract) {
     DV->setDIE(VariableDie);
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
index b4ff9e8d69..22401fe8fa 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -176,6 +176,9 @@ public:
   }
 public:
 
+  /// addFlag - Add a flag that is true to the DIE.
+  void addFlag(DIE *Die, unsigned Attribute);
+  
   /// addUInt - Add an unsigned integer attribute data and value.
   ///
   void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index fb4ae0f926..946ac35465 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -317,7 +317,7 @@ DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
     if (SP.isDefinition() && !SP.getContext().isCompileUnit() &&
         !SP.getContext().isFile() &&
         !isSubprogramContext(SP.getContext())) {
-      SPCU->addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+      SPCU->addFlag(SPDie, dwarf::DW_AT_declaration);
       
       // Add arguments.
       DICompositeType SPTy = SP.getType();
@@ -329,7 +329,7 @@ DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
           DIType ATy = DIType(DIType(Args.getElement(i)));
           SPCU->addType(Arg, ATy);
           if (ATy.isArtificial())
-            SPCU->addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+            SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
           SPDie->addChild(Arg);
         }
       DIE *SPDeclDie = SPDie;
@@ -610,7 +610,7 @@ CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
   if (!CompilationDir.empty())
     NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
   if (DIUnit.isOptimized())
-    NewCU->addUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
+    NewCU->addFlag(Die, dwarf::DW_AT_APPLE_optimized);
 
   StringRef Flags = DIUnit.getFlags();
   if (!Flags.empty())
@@ -1481,8 +1481,7 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
   DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
   
   if (!MF->getTarget().Options.DisableFramePointerElim(*MF))
-    TheCU->addUInt(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr,
-                   dwarf::DW_FORM_flag, 1);
+    TheCU->addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
 
   DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
                                                MMI->getFrameMoves()));