Use instruction itinerary to determine what instructions are 'cheap'.

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

diff --git a/include/llvm/CodeGen/MachineCodeEmitter.h b/include/llvm/CodeGen/MachineCodeEmitter.h
index c55a9e65e4535513df3623227a4ed6a5d39251e6..7abb49a219efe8104c43e1b93d6f8785e1a45fa9 100644 (file)
--- a/include/llvm/CodeGen/MachineCodeEmitter.h
+++ b/include/llvm/CodeGen/MachineCodeEmitter.h
@@ -31,6 +31,7 @@ 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
@@ -52,8 +53,7 @@ protected:
   /// 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 
+  /// 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
@@ -89,15 +89,23 @@ 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.
   ///
@@ -148,7 +156,7 @@ 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;
@@ -240,7 +248,7 @@ 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
@@ -309,10 +317,10 @@ 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.