//
// 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 <map>
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() {}
/// 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(const GlobalValue* F, 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 GlobalValue* 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) {
+ *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;
+ }
+
+
+ /// 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) {
- *(unsigned*)CurBufferPtr = W;
+ *((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) {
+ 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;
+
+ /// 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;
+
+ /// 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;
- // allocateGlobal - Allocate some space for a global variable.
- virtual unsigned char* allocateGlobal(unsigned size, unsigned alignment) = 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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