Make sure to consider alignment of variable sized objects.

[oota-llvm.git] / include / llvm / CodeGen / MachineCodeEmitter.h

diff --git a/include/llvm/CodeGen/MachineCodeEmitter.h b/include/llvm/CodeGen/MachineCodeEmitter.h
index c9eabf3cc3f14328207fd96afebd0816fcc6bb39..f5ee2e62371cfa19f2bb2a8b08c13f9579bd30f1 100644 (file)
--- a/include/llvm/CodeGen/MachineCodeEmitter.h
+++ b/include/llvm/CodeGen/MachineCodeEmitter.h
@@ -1,10 +1,10 @@
 //===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by the LLVM research group and is distributed under
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+//
 //===----------------------------------------------------------------------===//
 //
 // This file defines an abstract interface that is used by the machine code
@@ -17,14 +17,14 @@
 #ifndef LLVM_CODEGEN_MACHINECODEEMITTER_H
 #define LLVM_CODEGEN_MACHINECODEEMITTER_H
 
-#include <string>
 #include "llvm/Support/DataTypes.h"
 
 namespace llvm {
 
-class MachineFunction;
 class MachineBasicBlock;
 class MachineConstantPool;
+class MachineFunction;
+class MachineRelocation;
 class Value;
 class GlobalValue;
 class Function;
@@ -37,7 +37,7 @@ public:
   /// about to be code generated.
   ///
   virtual void startFunction(MachineFunction &F) {}
-  
+
   /// finishFunction - This callback is invoked when the specified function has
   /// finished code generation.
   ///
@@ -52,12 +52,12 @@ public:
   /// specifies the total size required by the stub.  Stubs are not allowed to
   /// have constant pools, the can only use the other emit* methods.
   ///
-  virtual void startFunctionStub(const Function &F, unsigned StubSize) {}
+  virtual void startFunctionStub(unsigned StubSize) {}
 
   /// finishFunctionStub - This callback is invoked to terminate a function
   /// stub.
   ///
-  virtual void *finishFunctionStub(const Function &F) { return 0; }
+  virtual void *finishFunctionStub(const Function *F) { return 0; }
 
   /// emitByte - This callback is invoked when a byte needs to be written to the
   /// output stream.
@@ -75,33 +75,28 @@ public:
   ///
   virtual void emitWord(unsigned W) = 0;
 
-  /// getGlobalValueAddress - This method is used to get the address of the
-  /// specified global value.  In some cases, however, the address may not yet
-  /// be known at the point that the method is called (for example, getting the
-  /// address of a function which has not yet been code generated).  If this is
-  /// the case, the function returns zero, and the callee has to be able to
-  /// handle the situation.
+  /// getCurrentPCValue - This returns the address that the next emitted byte
+  /// will be output to.
   ///
-  virtual uint64_t getGlobalValueAddress(GlobalValue *V) = 0;
-  virtual uint64_t getGlobalValueAddress(const char *SymName) = 0;
+  virtual uint64_t getCurrentPCValue() = 0;
+
+
+  /// getCurrentPCOffset - Return the offset from the start of the emitted
+  /// buffer that we are currently writing to.
+  virtual uint64_t getCurrentPCOffset() = 0;
+
+  /// addRelocation - Whenever a relocatable address is needed, it should be
+  /// noted with this interface.
+  virtual void addRelocation(const MachineRelocation &MR) = 0;
 
   // getConstantPoolEntryAddress - Return the address of the 'Index' entry in
   // the constant pool that was last emitted with the 'emitConstantPool' method.
   //
   virtual uint64_t getConstantPoolEntryAddress(unsigned Index) = 0;
 
-  // getCurrentPCValue - This returns the address that the next emitted byte
-  // will be output to.
-  //
-  virtual uint64_t getCurrentPCValue() = 0;
+  // allocateGlobal - Allocate some space for a global variable.
+  virtual unsigned char* allocateGlobal(unsigned size, unsigned alignment) = 0;
 
-  // forceCompilationOf - Force the compilation of the specified function, and
-  // return its address, because we REALLY need the address now.
-  //
-  // FIXME: This is JIT specific!
-  //
-  virtual uint64_t forceCompilationOf(Function *F) = 0;
-  
   /// createDebugEmitter - Return a dynamically allocated machine
   /// code emitter, which just prints the opcodes and fields out the cout.  This
   /// can be used for debugging users of the MachineCodeEmitter interface.