Use forward declarations and move TargetELFWriterInfo impl to a new file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73209 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetELFWriterInfo.h

@@ -14,11 +14,10 @@
 #ifndef LLVM_TARGET_TARGETELFWRITERINFO_H
 #define LLVM_TARGET_TARGETELFWRITERINFO_H
 
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Function.h"
-
 namespace llvm {
+  class Function;
+  class TargetData;
+  class TargetMachine;
 
   //===--------------------------------------------------------------------===//
   //                          TargetELFWriterInfo
@@ -50,21 +49,14 @@ namespace llvm {
       EM_X86_64 = 62   // AMD64
     };
 
-    explicit TargetELFWriterInfo(TargetMachine &tm) : TM(tm) {}
-    virtual ~TargetELFWriterInfo() {}
+    explicit TargetELFWriterInfo(TargetMachine &tm);
+    virtual ~TargetELFWriterInfo();
 
     unsigned short getEMachine() const { return EMachine; }
 
     /// getFunctionAlignment - Returns the alignment for function 'F', targets
     /// with different alignment constraints should overload this method
-    virtual unsigned getFunctionAlignment(const Function *F) const {
-      const TargetData *TD = TM.getTargetData();
-      unsigned FnAlign = F->getAlignment();
-      unsigned TDAlign = TD->getPointerABIAlignment();
-      unsigned Align = std::max(FnAlign, TDAlign);
-      assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
-      return Align;
-    }
+    virtual unsigned getFunctionAlignment(const Function *F) const;
   };
 
 } // end llvm namespace

lib/Target/CMakeLists.txt

@@ -5,6 +5,7 @@ add_llvm_library(LLVMTarget
   Target.cpp
   TargetAsmInfo.cpp
   TargetData.cpp
+  TargetELFWriterInfo.cpp
   TargetFrameInfo.cpp
   TargetInstrInfo.cpp
   TargetMachOWriterInfo.cpp
@@ -14,4 +15,4 @@ add_llvm_library(LLVMTarget
   TargetSubtarget.cpp
   )
 
-# TODO: Support other targets besides X86. See Makefile.
+# TODO: Support other targets besides X86. See Makefile.

lib/Target/TargetELFWriterInfo.cpp

@@ -0,0 +1,33 @@
+//===-- lib/Target/TargetELFWriterInfo.cpp - ELF Writer Info --0-*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the TargetELFWriterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Function.h"
+#include "llvm/Target/TargetELFWriterInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+using namespace llvm;
+
+TargetELFWriterInfo::TargetELFWriterInfo(TargetMachine &tm) : TM(tm) {}
+
+TargetELFWriterInfo::~TargetELFWriterInfo() {}
+
+/// getFunctionAlignment - Returns the alignment for function 'F', targets
+/// with different alignment constraints should overload this method
+unsigned TargetELFWriterInfo::getFunctionAlignment(const Function *F) const {
+  const TargetData *TD = TM.getTargetData();
+  unsigned FnAlign = F->getAlignment();
+  unsigned TDAlign = TD->getPointerABIAlignment();
+  unsigned Align = std::max(FnAlign, TDAlign);
+  assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
+  return Align;
+}

lib/Target/X86/X86ELFWriterInfo.cpp

@@ -12,8 +12,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "X86ELFWriterInfo.h"
+#include "llvm/Function.h"
+#include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
-#include "llvm/DerivedTypes.h"
 using namespace llvm;
 
 X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)