#define LLVM_CODEGEN_MACHINECODEEMITTER_H
#include "llvm/Support/DataTypes.h"
-#include <map>
+#include <vector>
namespace llvm {
/// about to be code generated. This initializes the BufferBegin/End/Ptr
/// fields.
///
- virtual void startFunction(MachineFunction &F) {}
+ virtual void startFunction(MachineFunction &F) = 0;
/// finishFunction - This callback is invoked when the specified function has
/// finished code generation. If a buffer overflow has occurred, this method
/// returns true (the callee is required to try again), otherwise it returns
/// false.
///
- virtual bool finishFunction(MachineFunction &F) {
- return CurBufferPtr == BufferEnd;
- }
-
- /// emitConstantPool - This callback is invoked to output the constant pool
- /// for the function.
- virtual void emitConstantPool(MachineConstantPool *MCP) {}
-
- /// initJumpTableInfo - This callback is invoked by the JIT to allocate the
- /// necessary memory to hold the jump tables.
- virtual void initJumpTableInfo(MachineJumpTableInfo *MJTI) {}
-
- /// emitJumpTableInfo - This callback is invoked to output the jump tables
- /// for the function. In addition to a pointer to the MachineJumpTableInfo,
- /// this function also takes a map of MBBs to addresses, so that the final
- /// addresses of the MBBs can be written to the jump tables.
- virtual void emitJumpTableInfo(MachineJumpTableInfo *MJTI,
- std::map<MachineBasicBlock*,uint64_t> &MBBM) {}
+ virtual bool finishFunction(MachineFunction &F) = 0;
/// startFunctionStub - This callback is invoked when the JIT needs the
/// address of a function that has not been code generated yet. The StubSize
/// have constant pools, the can only use the other emitByte*/emitWord*
/// methods.
///
- virtual void startFunctionStub(unsigned StubSize) {}
+ virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) = 0;
/// finishFunctionStub - This callback is invoked to terminate a function
/// stub.
///
- virtual void *finishFunctionStub(const Function *F) { return 0; }
+ virtual void *finishFunctionStub(const Function *F) = 0;
/// emitByte - This callback is invoked when a byte needs to be written to the
/// output stream.
*CurBufferPtr++ = B;
}
- /// emitWord - This callback is invoked when a word needs to be written to the
- /// output stream.
+ /// emitWordLE - This callback is invoked when a 32-bit word needs to be
+ /// written to the output stream in little-endian format.
+ ///
+ void emitWordLE(unsigned W) {
+ if (CurBufferPtr+4 <= BufferEnd) {
+ *CurBufferPtr++ = (unsigned char)(W >> 0);
+ *CurBufferPtr++ = (unsigned char)(W >> 8);
+ *CurBufferPtr++ = (unsigned char)(W >> 16);
+ *CurBufferPtr++ = (unsigned char)(W >> 24);
+ } else {
+ CurBufferPtr = BufferEnd;
+ }
+ }
+
+ /// emitWordBE - This callback is invoked when a 32-bit word needs to be
+ /// written to the output stream in big-endian format.
///
- void emitWord(unsigned W) {
- // FIXME: handle endian mismatches for .o file emission.
+ void emitWordBE(unsigned W) {
if (CurBufferPtr+4 <= BufferEnd) {
- *(unsigned*)CurBufferPtr = W;
- CurBufferPtr += 4;
+ *CurBufferPtr++ = (unsigned char)(W >> 24);
+ *CurBufferPtr++ = (unsigned char)(W >> 16);
+ *CurBufferPtr++ = (unsigned char)(W >> 8);
+ *CurBufferPtr++ = (unsigned char)(W >> 0);
} else {
CurBufferPtr = BufferEnd;
}
}
+ /// emitAlignment - Move the CurBufferPtr pointer up the the specified
+ /// alignment (saturated to BufferEnd of course).
+ void emitAlignment(unsigned Alignment) {
+ if (Alignment == 0) Alignment = 1;
+ // Move the current buffer ptr up to the specified alignment.
+ CurBufferPtr =
+ (unsigned char*)(((intptr_t)CurBufferPtr+Alignment-1) &
+ ~(intptr_t)(Alignment-1));
+ if (CurBufferPtr > BufferEnd)
+ CurBufferPtr = BufferEnd;
+ }
+
+ /// allocateSpace - Allocate a block of space in the current output buffer,
+ /// returning null (and setting conditions to indicate buffer overflow) on
+ /// failure. Alignment is the alignment in bytes of the buffer desired.
+ void *allocateSpace(intptr_t Size, unsigned Alignment) {
+ emitAlignment(Alignment);
+ void *Result = CurBufferPtr;
+
+ // Allocate the space.
+ CurBufferPtr += Size;
+
+ // Check for buffer overflow.
+ if (CurBufferPtr >= BufferEnd) {
+ CurBufferPtr = BufferEnd;
+ Result = 0;
+ }
+ return Result;
+ }
+
+ /// StartMachineBasicBlock - This should be called by the target when a new
+ /// basic block is about to be emitted. This way the MCE knows where the
+ /// start of the block is, and can implement getMachineBasicBlockAddress.
+ virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) = 0;
+
/// getCurrentPCValue - This returns the address that the next emitted byte
/// will be output to.
///
/// noted with this interface.
virtual void addRelocation(const MachineRelocation &MR) = 0;
+
+ /// FIXME: These should all be handled with relocations!
+
/// 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;
+ virtual intptr_t getConstantPoolEntryAddress(unsigned Index) const = 0;
/// getJumpTableEntryAddress - Return the address of the jump table with index
/// 'Index' in the function that last called initJumpTableInfo.
///
- virtual uint64_t getJumpTableEntryAddress(unsigned Index) = 0;
+ virtual intptr_t getJumpTableEntryAddress(unsigned Index) const = 0;
- // allocateGlobal - Allocate some space for a global variable.
- virtual unsigned char* allocateGlobal(unsigned size, unsigned alignment) = 0;
+ /// getMachineBasicBlockAddress - Return the address of the specified
+ /// MachineBasicBlock, only usable after the label for the MBB has been
+ /// emitted.
+ ///
+ virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
};
} // End llvm namespace