//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#define LLVM_CODEGEN_MACHINECODEEMITTER_H
#include "llvm/Support/DataTypes.h"
-#include <vector>
namespace llvm {
class MachineConstantPool;
class MachineJumpTableInfo;
class MachineFunction;
+class MachineModuleInfo;
class MachineRelocation;
class Value;
class GlobalValue;
/// all code emission requests will be ignored (this is the buffer overflow
/// condition).
unsigned char *CurBufferPtr;
+
public:
virtual ~MachineCodeEmitter() {}
///
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
- /// specifies the total size required by the stub. Stubs are not allowed to
- /// have constant pools, the can only use the other emitByte*/emitWord*
- /// methods.
+ /// startGVStub - This callback is invoked when the JIT needs the
+ /// address of a GV (e.g. function) that has not been code generated yet.
+ /// The StubSize specifies the total size required by the stub.
///
- virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) = 0;
+ virtual void startGVStub(const GlobalValue* GV, unsigned StubSize,
+ unsigned Alignment = 1) = 0;
- /// finishFunctionStub - This callback is invoked to terminate a function
- /// stub.
+ /// finishGVStub - This callback is invoked to terminate a GV stub.
///
- virtual void *finishFunctionStub(const Function *F) = 0;
+ virtual void *finishGVStub(const GlobalValue* F) = 0;
/// emitByte - This callback is invoked when a byte needs to be written to the
/// output stream.
}
}
+ /// emitDWordLE - This callback is invoked when a 64-bit word needs to be
+ /// written to the output stream in little-endian format.
+ ///
+ void emitDWordLE(uint64_t W) {
+ if (CurBufferPtr+8 <= BufferEnd) {
+ *CurBufferPtr++ = (unsigned char)(W >> 0);
+ *CurBufferPtr++ = (unsigned char)(W >> 8);
+ *CurBufferPtr++ = (unsigned char)(W >> 16);
+ *CurBufferPtr++ = (unsigned char)(W >> 24);
+ *CurBufferPtr++ = (unsigned char)(W >> 32);
+ *CurBufferPtr++ = (unsigned char)(W >> 40);
+ *CurBufferPtr++ = (unsigned char)(W >> 48);
+ *CurBufferPtr++ = (unsigned char)(W >> 56);
+ } else {
+ CurBufferPtr = BufferEnd;
+ }
+ }
+
+ /// emitDWordBE - This callback is invoked when a 64-bit word needs to be
+ /// written to the output stream in big-endian format.
+ ///
+ void emitDWordBE(uint64_t W) {
+ if (CurBufferPtr+8 <= BufferEnd) {
+ *CurBufferPtr++ = (unsigned char)(W >> 56);
+ *CurBufferPtr++ = (unsigned char)(W >> 48);
+ *CurBufferPtr++ = (unsigned char)(W >> 40);
+ *CurBufferPtr++ = (unsigned char)(W >> 32);
+ *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) {
CurBufferPtr = BufferEnd;
}
+
+ /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be
+ /// written to the output stream.
+ void emitULEB128Bytes(unsigned Value) {
+ do {
+ unsigned char Byte = Value & 0x7f;
+ Value >>= 7;
+ if (Value) Byte |= 0x80;
+ emitByte(Byte);
+ } while (Value);
+ }
+
+ /// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be
+ /// written to the output stream.
+ void emitSLEB128Bytes(int Value) {
+ int Sign = Value >> (8 * sizeof(Value) - 1);
+ bool IsMore;
+
+ do {
+ unsigned char Byte = Value & 0x7f;
+ Value >>= 7;
+ IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+ if (IsMore) Byte |= 0x80;
+ emitByte(Byte);
+ } while (IsMore);
+ }
+
+ /// emitString - This callback is invoked when a String needs to be
+ /// written to the output stream.
+ void emitString(const std::string &String) {
+ for (unsigned i = 0, N = static_cast<unsigned>(String.size());
+ i < N; ++i) {
+ unsigned char C = String[i];
+ emitByte(C);
+ }
+ emitByte(0);
+ }
+
+ /// emitInt32 - Emit a int32 directive.
+ void emitInt32(int Value) {
+ if (CurBufferPtr+4 <= BufferEnd) {
+ *((uint32_t*)CurBufferPtr) = Value;
+ CurBufferPtr += 4;
+ } else {
+ CurBufferPtr = BufferEnd;
+ }
+ }
+
+ /// emitInt64 - Emit a int64 directive.
+ void emitInt64(uint64_t Value) {
+ if (CurBufferPtr+8 <= BufferEnd) {
+ *((uint64_t*)CurBufferPtr) = Value;
+ CurBufferPtr += 8;
+ } else {
+ CurBufferPtr = BufferEnd;
+ }
+ }
+
+ /// emitAt - Emit Value in Addr
+ void emitAt(uintptr_t *Addr, uintptr_t Value) {
+ if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd)
+ (*Addr) = Value;
+ }
+
+ /// emitLabel - Emits a label
+ virtual void emitLabel(uint64_t LabelID) = 0;
+
/// 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) {
+ virtual void *allocateSpace(intptr_t Size, unsigned Alignment) {
emitAlignment(Alignment);
void *Result = CurBufferPtr;
/// emitted.
///
virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
+
+ /// getLabelAddress - Return the address of the specified LabelID, only usable
+ /// after the LabelID has been emitted.
+ ///
+ virtual intptr_t getLabelAddress(uint64_t LabelID) const = 0;
+
+ /// Specifies the MachineModuleInfo object. This is used for exception handling
+ /// purposes.
+ virtual void setModuleInfo(MachineModuleInfo* Info) = 0;
};
} // End llvm namespace
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