From 222e2a7620e6520ffaf4fc4e69d79c18da31542e Mon Sep 17 00:00:00 2001
From: "Zancanaro; Carlo" <czan8762@plang3.cs.usyd.edu.au>
Date: Mon, 24 Sep 2012 09:58:17 +1000
Subject: Add the clang library to the repo (with some of my changes, too).

---
 clang/lib/CodeGen/ModuleBuilder.cpp | 127 ++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 clang/lib/CodeGen/ModuleBuilder.cpp

(limited to 'clang/lib/CodeGen/ModuleBuilder.cpp')

diff --git a/clang/lib/CodeGen/ModuleBuilder.cpp b/clang/lib/CodeGen/ModuleBuilder.cpp
new file mode 100644
index 0000000..ea2389e
--- /dev/null
+++ b/clang/lib/CodeGen/ModuleBuilder.cpp
@@ -0,0 +1,127 @@
+//===--- ModuleBuilder.cpp - Emit LLVM Code from ASTs ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This builds an AST and converts it to LLVM Code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "CodeGenModule.h"
+#include "clang/Frontend/CodeGenOptions.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/TargetInfo.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/ADT/OwningPtr.h"
+using namespace clang;
+
+namespace {
+  class CodeGeneratorImpl : public CodeGenerator {
+    DiagnosticsEngine &Diags;
+    OwningPtr<const llvm::TargetData> TD;
+    ASTContext *Ctx;
+    const CodeGenOptions CodeGenOpts;  // Intentionally copied in.
+  protected:
+    OwningPtr<llvm::Module> M;
+    OwningPtr<CodeGen::CodeGenModule> Builder;
+  public:
+    CodeGeneratorImpl(DiagnosticsEngine &diags, const std::string& ModuleName,
+                      const CodeGenOptions &CGO, llvm::LLVMContext& C)
+      : Diags(diags), CodeGenOpts(CGO), M(new llvm::Module(ModuleName, C)) {}
+
+    virtual ~CodeGeneratorImpl() {}
+
+    virtual llvm::Module* GetModule() {
+      return M.get();
+    }
+
+    virtual llvm::Module* ReleaseModule() {
+      return M.take();
+    }
+
+    virtual void Initialize(ASTContext &Context) {
+      Ctx = &Context;
+
+      M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple());
+      M->setDataLayout(Ctx->getTargetInfo().getTargetDescription());
+      TD.reset(new llvm::TargetData(Ctx->getTargetInfo().getTargetDescription()));
+      Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts,
+                                               *M, *TD, Diags));
+    }
+
+    virtual void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
+      Builder->HandleCXXStaticMemberVarInstantiation(VD);
+    }
+
+    virtual bool HandleTopLevelDecl(DeclGroupRef DG) {
+      // Make sure to emit all elements of a Decl.
+      for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
+        Builder->EmitTopLevelDecl(*I);
+      return true;
+    }
+
+    /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
+    /// to (e.g. struct, union, enum, class) is completed. This allows the
+    /// client hack on the type, which can occur at any point in the file
+    /// (because these can be defined in declspecs).
+    virtual void HandleTagDeclDefinition(TagDecl *D) {
+      Builder->UpdateCompletedType(D);
+      
+      // In C++, we may have member functions that need to be emitted at this 
+      // point.
+      if (Ctx->getLangOpts().CPlusPlus && !D->isDependentContext()) {
+        for (DeclContext::decl_iterator M = D->decls_begin(), 
+                                     MEnd = D->decls_end();
+             M != MEnd; ++M)
+          if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*M))
+            if (Method->doesThisDeclarationHaveABody() &&
+                (Method->hasAttr<UsedAttr>() || 
+                 Method->hasAttr<ConstructorAttr>()))
+              Builder->EmitTopLevelDecl(Method);
+      }
+    }
+
+    virtual void HandleTranslationUnit(ASTContext &Ctx) {
+      if (Diags.hasErrorOccurred()) {
+        M.reset();
+        return;
+      }
+
+      if (Builder)
+        Builder->Release();
+    }
+
+    virtual void CompleteTentativeDefinition(VarDecl *D) {
+      if (Diags.hasErrorOccurred())
+        return;
+
+      Builder->EmitTentativeDefinition(D);
+    }
+
+    virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) {
+      if (Diags.hasErrorOccurred())
+        return;
+
+      Builder->EmitVTable(RD, DefinitionRequired);
+    }
+  };
+}
+
+void CodeGenerator::anchor() { }
+
+CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags,
+                                        const std::string& ModuleName,
+                                        const CodeGenOptions &CGO,
+                                        llvm::LLVMContext& C) {
+  return new CodeGeneratorImpl(Diags, ModuleName, CGO, C);
+}
-- 
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