Fix include guards so they exactly match file names.

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

diff --git a/include/llvm/CodeGen/MachineCodeEmitter.h b/include/llvm/CodeGen/MachineCodeEmitter.h
index 791db003ead11cfc9eb3a5cc11528b8b965cb181..9e41e6e9c1ee8c343bf17ed9c98b56fe802e1445 100644 (file)
--- a/include/llvm/CodeGen/MachineCodeEmitter.h
+++ b/include/llvm/CodeGen/MachineCodeEmitter.h
@@ -17,8 +17,9 @@
 #ifndef LLVM_CODEGEN_MACHINECODEEMITTER_H
 #define LLVM_CODEGEN_MACHINECODEEMITTER_H
 
-#include "llvm/System/DataTypes.h"
+#include "llvm/Support/DataTypes.h"
 #include "llvm/Support/DebugLoc.h"
+#include <string>
 
 namespace llvm {
 
@@ -31,9 +32,10 @@ class MachineRelocation;
 class Value;
 class GlobalValue;
 class Function;
+class MCSymbol;
 
 /// MachineCodeEmitter - This class defines two sorts of methods: those for
-/// emitting the actual bytes of machine code, and those for emitting auxillary
+/// emitting the actual bytes of machine code, and those for emitting auxiliary
 /// structures, such as jump tables, relocations, etc.
 ///
 /// Emission of machine code is complicated by the fact that we don't (in
@@ -48,41 +50,17 @@ class Function;
 /// occurred, more memory is allocated, and we reemit the code into it.
 /// 
 class MachineCodeEmitter {
-public:
-  class BufferState {
-    friend class MachineCodeEmitter;
-    /// BufferBegin/BufferEnd - Pointers to the start and end of the memory
-    /// allocated for this code buffer.
-    uint8_t *BufferBegin, *BufferEnd;
-
-    /// CurBufferPtr - Pointer to the next byte of memory to fill when emitting
-    /// code.  This is guranteed to be in the range [BufferBegin,BufferEnd].  If
-    /// this pointer is at BufferEnd, it will never move due to code emission,
-    /// and all code emission requests will be ignored (this is the buffer
-    /// overflow condition).
-    uint8_t *CurBufferPtr;
-  public:
-    BufferState() : BufferBegin(NULL), BufferEnd(NULL), CurBufferPtr(NULL) {}
-  };
-
+  virtual void anchor();
 protected:
-  /// These have the same meanings as the fields in BufferState
-  uint8_t *BufferBegin, *BufferEnd, *CurBufferPtr;
-
-  /// Save or restore the current buffer state.  The BufferState objects must be
-  /// used as a stack.
-  void SaveStateTo(BufferState &BS) {
-    assert(BS.BufferBegin == NULL &&
-           "Can't save state into the same BufferState twice.");
-    BS.BufferBegin = BufferBegin;
-    BS.BufferEnd = BufferEnd;
-    BS.CurBufferPtr = CurBufferPtr;
-  }
-  void RestoreStateFrom(BufferState &BS) {
-    BufferBegin = BS.BufferBegin;
-    BufferEnd = BS.BufferEnd;
-    CurBufferPtr = BS.CurBufferPtr;
-  }
+  /// BufferBegin/BufferEnd - Pointers to the start and end of the memory
+  /// allocated for this code buffer.
+  uint8_t *BufferBegin, *BufferEnd;
+  /// CurBufferPtr - Pointer to the next byte of memory to fill when emitting
+  /// code.  This is guaranteed to be in the range [BufferBegin,BufferEnd].  If
+  /// this pointer is at BufferEnd, it will never move due to code emission, and
+  /// all code emission requests will be ignored (this is the buffer overflow
+  /// condition).
+  uint8_t *CurBufferPtr;
 
 public:
   virtual ~MachineCodeEmitter() {}
@@ -113,15 +91,23 @@ public:
   ///
   void emitWordLE(uint32_t W) {
     if (4 <= BufferEnd-CurBufferPtr) {
-      *CurBufferPtr++ = (uint8_t)(W >>  0);
-      *CurBufferPtr++ = (uint8_t)(W >>  8);
-      *CurBufferPtr++ = (uint8_t)(W >> 16);
-      *CurBufferPtr++ = (uint8_t)(W >> 24);
+      emitWordLEInto(CurBufferPtr, W);
     } else {
       CurBufferPtr = BufferEnd;
     }
   }
-  
+
+  /// emitWordLEInto - This callback is invoked when a 32-bit word needs to be
+  /// written to an arbitrary buffer in little-endian format.  Buf must have at
+  /// least 4 bytes of available space.
+  ///
+  static void emitWordLEInto(uint8_t *&Buf, uint32_t W) {
+    *Buf++ = (uint8_t)(W >>  0);
+    *Buf++ = (uint8_t)(W >>  8);
+    *Buf++ = (uint8_t)(W >> 16);
+    *Buf++ = (uint8_t)(W >> 24);
+  }
+
   /// emitWordBE - This callback is invoked when a 32-bit word needs to be
   /// written to the output stream in big-endian format.
   ///
@@ -172,7 +158,7 @@ public:
     }
   }
 
-  /// emitAlignment - Move the CurBufferPtr pointer up the the specified
+  /// emitAlignment - Move the CurBufferPtr pointer up to the specified
   /// alignment (saturated to BufferEnd of course).
   void emitAlignment(unsigned Alignment) {
     if (Alignment == 0) Alignment = 1;
@@ -264,7 +250,7 @@ public:
   virtual void processDebugLoc(DebugLoc DL, bool BeforePrintintInsn) {}
 
   /// emitLabel - Emits a label
-  virtual void emitLabel(uint64_t LabelID) = 0;
+  virtual void emitLabel(MCSymbol *Label) = 0;
 
   /// allocateSpace - Allocate a block of space in the current output buffer,
   /// returning null (and setting conditions to indicate buffer overflow) on
@@ -333,10 +319,10 @@ public:
   ///
   virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
 
-  /// getLabelAddress - Return the address of the specified LabelID, only usable
+  /// getLabelAddress - Return the address of the specified Label, only usable
   /// after the LabelID has been emitted.
   ///
-  virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
+  virtual uintptr_t getLabelAddress(MCSymbol *Label) const = 0;
   
   /// Specifies the MachineModuleInfo object. This is used for exception handling
   /// purposes.