Add preliminary (and probably broken) codegen support for C++ static initializers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55180 91177308-0d34-0410-b5e6-96231b3b80d8

clang.xcodeproj/project.pbxproj

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@@ -263,6 +264,7 @@
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+		1A5D5E570E5E81010023C059 /* CGCXX.cpp */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 2; lastKnownFileType = sourcecode.cpp.cpp; name = CGCXX.cpp; path = lib/CodeGen/CGCXX.cpp; sourceTree = "<group>"; tabWidth = 2; };
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@@ -357,7 +359,7 @@
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-		DE06B73D0A8307640050E87E /* LangOptions.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = LangOptions.h; sourceTree = "<group>"; };
+		DE06B73D0A8307640050E87E /* LangOptions.h */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = sourcecode.c.h; path = LangOptions.h; sourceTree = "<group>"; tabWidth = 2; };
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@@ -392,7 +394,7 @@
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+		DE3986EF0CB8D4B300223765 /* IdentifierTable.h */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = sourcecode.c.h; path = IdentifierTable.h; sourceTree = "<group>"; tabWidth = 2; };
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@@ -412,8 +414,8 @@
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-		DE4264FB0C113592005A861D /* CGDecl.cpp */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.cpp.cpp; name = CGDecl.cpp; path = lib/CodeGen/CGDecl.cpp; sourceTree = "<group>"; };
+		DE4264FB0C113592005A861D /* CGDecl.cpp */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = sourcecode.cpp.cpp; name = CGDecl.cpp; path = lib/CodeGen/CGDecl.cpp; sourceTree = "<group>"; tabWidth = 2; };
-		DE46BF270AE0A82D00CC047C /* TargetInfo.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = TargetInfo.h; sourceTree = "<group>"; };
+		DE46BF270AE0A82D00CC047C /* TargetInfo.h */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = sourcecode.c.h; path = TargetInfo.h; sourceTree = "<group>"; tabWidth = 2; };
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@@ -450,7 +452,7 @@
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+		DE928B800C0A615B00231DA4 /* CodeGenFunction.h */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = sourcecode.c.h; name = CodeGenFunction.h; path = lib/CodeGen/CodeGenFunction.h; sourceTree = "<group>"; tabWidth = 2; usesTabs = 0; };
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@@ -465,13 +467,13 @@
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-		DED7D7310A524295003AD0FB /* Diagnostic.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = Diagnostic.h; sourceTree = "<group>"; };
+		DED7D7310A524295003AD0FB /* Diagnostic.h */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = sourcecode.c.h; path = Diagnostic.h; sourceTree = "<group>"; tabWidth = 2; };
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+		DED7D7320A524295003AD0FB /* DiagnosticKinds.def */ = {isa = PBXFileReference; fileEncoding = 30; indentWidth = 2; lastKnownFileType = text; path = DiagnosticKinds.def; sourceTree = "<group>"; tabWidth = 2; };
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@@ -791,7 +793,6 @@
 		DE927FCC0C0557CD00231DA4 /* CodeGen */ = {
 			isa = PBXGroup;
 			children = (
-				3552E7580E520DD7003A8CA5 /* CGObjCMac.cpp */,
 				DE928B800C0A615B00231DA4 /* CodeGenFunction.h */,
 				DE928B820C0A616000231DA4 /* CodeGenFunction.cpp */,
 				DE928B7C0C0A615100231DA4 /* CodeGenModule.h */,
@@ -799,6 +800,7 @@
 				DEEBC3BB0C2363BC00A9FE82 /* CodeGenTypes.cpp */,
 				DEEBC3B90C2363B800A9FE82 /* CodeGenTypes.h */,
 				1ABC36930C7A4BDC006DB0AB /* CGBuiltin.cpp */,
+				1A5D5E570E5E81010023C059 /* CGCXX.cpp */,
 				35A3E7000DD3874400757F74 /* CGDebugInfo.cpp */,
 				35A3E7010DD3874400757F74 /* CGDebugInfo.h */,
 				DE4264FB0C113592005A861D /* CGDecl.cpp */,
@@ -810,6 +812,7 @@
 				1A7342470C7B57D500122F56 /* CGObjC.cpp */,
 				DE38CD4E0D794CF900A273B6 /* CGObjCRuntime.h */,
 				DE38CD4F0D794D0100A273B6 /* CGObjCGNU.cpp */,
+				3552E7580E520DD7003A8CA5 /* CGObjCMac.cpp */,
 				DE4772F90C10EAE5002239E8 /* CGStmt.cpp */,
 				DE928B120C05659200231DA4 /* ModuleBuilder.cpp */,
 			);
@@ -1201,6 +1204,7 @@
 				3552E7550E520D80003A8CA5 /* PPCaching.cpp in Sources */,
 				3552E7590E520DD7003A8CA5 /* CGObjCMac.cpp in Sources */,
 				358F51520E529AA4007F2102 /* GRState.cpp in Sources */,
+				1A5D5E580E5E81010023C059 /* CGCXX.cpp in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

include/clang/Basic/LangOptions.h

@@ -46,6 +46,8 @@ struct LangOptions {
 
   unsigned NeXTRuntime       : 1; // Use NeXT runtime.
 
+  unsigned ThreadsafeStatics : 1; // Whether static initializers are protected
+                                  // by lockis.
 private:
   unsigned GC : 2; // Objective-C Garbage Collection modes.  We declare
                    // this enum as unsigned because MSVC insists on making enums
@@ -60,7 +62,10 @@ public:
     GC = ObjC1 = ObjC2 = 0;
     C99 = Microsoft = CPlusPlus = CPlusPlus0x = NoExtensions = 0;
     CXXOperatorNames = PascalStrings = Boolean = WritableStrings = 0;
-    LaxVectorConversions = Exceptions = NeXTRuntime = 0;    
+    LaxVectorConversions = Exceptions = NeXTRuntime = 0;
+    
+    // FIXME: The default should be 1.
+    ThreadsafeStatics = 0;
   }
   
   GCMode getGCMode() const { return (GCMode) GC; }

lib/CodeGen/CGCXX.cpp

@@ -0,0 +1,136 @@
+//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code dealing with C++ code generation.
+//
+//===----------------------------------------------------------------------===//
+
+// We might split this into multiple files if it gets too unwieldy 
+
+#include "CodeGenFunction.h"
+#include "CodeGenModule.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "llvm/ADT/StringExtras.h"
+
+using namespace clang;
+using namespace CodeGen;
+
+using llvm::utostr;
+
+
+// FIXME: Name mangling should be moved to a separate class.
+
+static void mangleDeclContextInternal(const DeclContext *D, std::string &S)
+{
+  assert(isa<TranslationUnitDecl>(D->getParent()) && 
+         "Only one level of decl context mangling is currently supported!");
+  
+  if (FunctionDecl* FD = dyn_cast<FunctionDecl>(D)) {
+    S += utostr(FD->getIdentifier()->getLength());
+    S += FD->getIdentifier()->getName();
+    
+    if (FD->param_size() == 0)
+      S += 'v';
+    else
+      assert(0 && "mangling of types not supported yet!");
+  } else 
+    assert(0 && "Unsupported decl type!");
+}
+
+static void mangleVarDeclInternal(const VarDecl &D, std::string &S)
+{
+  S += 'Z';
+  mangleDeclContextInternal(D.getDeclContext(), S);
+  S += 'E';
+  
+  S += utostr(D.getIdentifier()->getLength());
+  S += D.getIdentifier()->getName();
+}
+
+static std::string mangleVarDecl(const VarDecl& D)
+{
+  std::string S = "_Z";
+  
+  mangleVarDeclInternal(D, S);
+  
+  return S;
+}
+
+static std::string mangleGuardVariable(const VarDecl& D)
+{
+  std::string S = "_ZGV";
+
+  mangleVarDeclInternal(D, S);
+  
+  return S;
+}
+
+llvm::GlobalValue *
+CodeGenFunction::GenerateStaticCXXBlockVarDecl(const VarDecl &D)
+{
+  assert(!getContext().getLangOptions().ThreadsafeStatics &&
+         "thread safe statics are currently not supported!");
+  const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType());
+
+  // FIXME: If the function is inline, the linkage should be weak.
+  llvm::GlobalValue::LinkageTypes linkage = llvm::GlobalValue::InternalLinkage;
+  
+  // Create the guard variable.
+  llvm::GlobalValue *GuardV = 
+    new llvm::GlobalVariable(llvm::Type::Int64Ty, false,
+                             linkage,
+                             llvm::Constant::getNullValue(llvm::Type::Int64Ty),
+                             mangleGuardVariable(D),
+                             &CGM.getModule());
+  
+  // FIXME: Address space.
+  const llvm::Type *PtrTy = llvm::PointerType::get(llvm::Type::Int8Ty, 0);
+
+  // Load the first byte of the guard variable.
+  llvm::Value *V = Builder.CreateLoad(Builder.CreateBitCast(GuardV, PtrTy), 
+                                      "tmp");
+  
+  // Compare it against 0.
+  llvm::Value *nullValue = llvm::Constant::getNullValue(llvm::Type::Int8Ty);
+  llvm::Value *ICmp = Builder.CreateICmpEQ(V, nullValue , "tobool");
+  
+  llvm::BasicBlock *InitBlock = llvm::BasicBlock::Create("init");
+  llvm::BasicBlock *EndBlock = llvm::BasicBlock::Create("initend");
+
+  // If the guard variable is 0, jump to the initializer code.
+  Builder.CreateCondBr(ICmp, InitBlock, EndBlock);
+                         
+  EmitBlock(InitBlock);
+
+  llvm::GlobalValue *GV =
+    new llvm::GlobalVariable(LTy, false,
+                             llvm::GlobalValue::InternalLinkage,
+                             llvm::Constant::getNullValue(LTy), 
+                             mangleVarDecl(D),
+                             &CGM.getModule(), 0, 
+                             D.getType().getAddressSpace());
+    
+  const Expr *Init = D.getInit();
+  if (!hasAggregateLLVMType(Init->getType())) {
+    llvm::Value *V = EmitScalarExpr(Init);
+    Builder.CreateStore(V, GV, D.getType().isVolatileQualified());
+  } else if (Init->getType()->isAnyComplexType()) {
+    EmitComplexExprIntoAddr(Init, GV, D.getType().isVolatileQualified());
+  } else {
+    EmitAggExpr(Init, GV, D.getType().isVolatileQualified());
+  }
+    
+  Builder.CreateStore(llvm::ConstantInt::get(llvm::Type::Int8Ty, 1),
+                      Builder.CreateBitCast(GuardV, PtrTy));
+                      
+  EmitBlock(EndBlock);
+  return GV;
+}
+

lib/CodeGen/CGDecl.cpp

@@ -86,7 +86,13 @@ CodeGenFunction::GenerateStaticBlockVarDecl(const VarDecl &D,
   if ((D.getInit() == 0) || NoInit) {
     Init = llvm::Constant::getNullValue(LTy);
   } else {
-    Init = CGM.EmitConstantExpr(D.getInit(), this);
+    if (D.getInit()->isConstantExpr(getContext(), 0))
+      Init = CGM.EmitConstantExpr(D.getInit(), this);
+    else {
+      assert(getContext().getLangOptions().CPlusPlus && 
+             "only C++ supports non-constant static initializers!");
+      return GenerateStaticCXXBlockVarDecl(D);
+    }
   }
 
   assert(Init && "Unable to create initialiser for static decl");

lib/CodeGen/CodeGenFunction.h

@@ -525,6 +525,10 @@ public:
                                                 bool NoInit,
                                                 const char *Separator);
 
+  // GenerateStaticBlockVarDecl - return the static declaration of
+  // a local variable. Performs initialization of the variable if necessary.
+  llvm::GlobalValue *GenerateStaticCXXBlockVarDecl(const VarDecl &D);
+
   //===--------------------------------------------------------------------===//
   //                             Internal Helpers
   //===--------------------------------------------------------------------===//