Break Frontend's dependency on Rewrite, Checker and CodeGen in shared library configuration

Currently, all AST consumers are located in the Frontend library,
meaning that in a shared library configuration, Frontend has a
dependency on Rewrite, Checker and CodeGen.  This is suboptimal for
clients which only wish to make use of the frontend.  CodeGen in
particular introduces a large number of unwanted dependencies.

This patch breaks the dependency by moving all AST consumers with
dependencies on Rewrite, Checker and/or CodeGen to their respective
libraries.  The patch therefore introduces dependencies in the other
direction (i.e. from Rewrite, Checker and CodeGen to Frontend).

After applying this patch, Clang builds correctly using CMake and
shared libraries ("cmake -DBUILD_SHARED_LIBS=ON").

N.B. This patch includes file renames which are indicated in the
patch body.

Changes in this revision of the patch:
 - Fixed some copy-paste mistakes in the header files
 - Modified certain aspects of the coding to comply with the LLVM
   Coding Standards

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106010 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 79 insertions, 0 deletions

diff --git a/include/clang/CodeGen/CodeGenAction.h b/include/clang/CodeGen/CodeGenAction.h
new file mode 100644
index 0000000000..cecfcda461
--- /dev/null
+++ b/include/clang/CodeGen/CodeGenAction.h
@@ -0,0 +1,79 @@
+//===--- CodeGenAction.h - LLVM Code Generation Frontend Action -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_CODEGEN_CODE_GEN_ACTION_H
+#define LLVM_CLANG_CODEGEN_CODE_GEN_ACTION_H
+
+#include "clang/Frontend/FrontendAction.h"
+#include "llvm/ADT/OwningPtr.h"
+
+namespace llvm {
+  class Module;
+}
+
+namespace clang {
+
+class CodeGenAction : public ASTFrontendAction {
+private:
+  unsigned Act;
+  llvm::OwningPtr<llvm::Module> TheModule;
+
+protected:
+  CodeGenAction(unsigned _Act);
+
+  virtual bool hasIRSupport() const;
+
+  virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
+                                         llvm::StringRef InFile);
+
+  virtual void ExecuteAction();
+
+  virtual void EndSourceFileAction();
+
+public:
+  ~CodeGenAction();
+
+  /// takeModule - Take the generated LLVM module, for use after the action has
+  /// been run. The result may be null on failure.
+  llvm::Module *takeModule();
+};
+
+class EmitAssemblyAction : public CodeGenAction {
+public:
+  EmitAssemblyAction();
+};
+
+class EmitBCAction : public CodeGenAction {
+public:
+  EmitBCAction();
+};
+
+class EmitLLVMAction : public CodeGenAction {
+public:
+  EmitLLVMAction();
+};
+
+class EmitLLVMOnlyAction : public CodeGenAction {
+public:
+  EmitLLVMOnlyAction();
+};
+
+class EmitCodeGenOnlyAction : public CodeGenAction {
+public:
+  EmitCodeGenOnlyAction();
+};
+
+class EmitObjAction : public CodeGenAction {
+public:
+  EmitObjAction();
+};
+
+}
+
+#endif