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Diffstat (limited to 'release_23/include/llvm/CodeGen/MachineCodeEmitter.h')
| -rw-r--r-- | release_23/include/llvm/CodeGen/MachineCodeEmitter.h | 279 |
1 files changed, 0 insertions, 279 deletions
diff --git a/release_23/include/llvm/CodeGen/MachineCodeEmitter.h b/release_23/include/llvm/CodeGen/MachineCodeEmitter.h deleted file mode 100644 index e38eb061baa6..000000000000 --- a/release_23/include/llvm/CodeGen/MachineCodeEmitter.h +++ /dev/null @@ -1,279 +0,0 @@ -//===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines an abstract interface that is used by the machine code -// emission framework to output the code. This allows machine code emission to -// be separated from concerns such as resolution of call targets, and where the -// machine code will be written (memory or disk, f.e.). -// -//===----------------------------------------------------------------------===// - -#ifndef LLVM_CODEGEN_MACHINECODEEMITTER_H -#define LLVM_CODEGEN_MACHINECODEEMITTER_H - -#include "llvm/Support/DataTypes.h" -#include <vector> - -namespace llvm { - -class MachineBasicBlock; -class MachineConstantPool; -class MachineJumpTableInfo; -class MachineFunction; -class MachineModuleInfo; -class MachineRelocation; -class Value; -class GlobalValue; -class Function; - -/// MachineCodeEmitter - This class defines two sorts of methods: those for -/// emitting the actual bytes of machine code, and those for emitting auxillary -/// structures, such as jump tables, relocations, etc. -/// -/// Emission of machine code is complicated by the fact that we don't (in -/// general) know the size of the machine code that we're about to emit before -/// we emit it. As such, we preallocate a certain amount of memory, and set the -/// BufferBegin/BufferEnd pointers to the start and end of the buffer. As we -/// emit machine instructions, we advance the CurBufferPtr to indicate the -/// location of the next byte to emit. In the case of a buffer overflow (we -/// need to emit more machine code than we have allocated space for), the -/// CurBufferPtr will saturate to BufferEnd and ignore stores. Once the entire -/// function has been emitted, the overflow condition is checked, and if it has -/// occurred, more memory is allocated, and we reemit the code into it. -/// -class MachineCodeEmitter { -protected: - /// BufferBegin/BufferEnd - Pointers to the start and end of the memory - /// allocated for this code buffer. - unsigned char *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). - unsigned char *CurBufferPtr; - -public: - virtual ~MachineCodeEmitter() {} - - /// startFunction - This callback is invoked when the specified function is - /// about to be code generated. This initializes the BufferBegin/End/Ptr - /// fields. - /// - 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) = 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. - /// - 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 GlobalValue* F) = 0; - - /// emitByte - This callback is invoked when a byte needs to be written to the - /// output stream. - /// - void emitByte(unsigned char B) { - if (CurBufferPtr != BufferEnd) - *CurBufferPtr++ = B; - } - - /// 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 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) { - *((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. - /// - virtual intptr_t getCurrentPCValue() const { - return (intptr_t)CurBufferPtr; - } - - /// getCurrentPCOffset - Return the offset from the start of the emitted - /// buffer that we are currently writing to. - intptr_t getCurrentPCOffset() const { - return CurBufferPtr-BufferBegin; - } - - /// addRelocation - Whenever a relocatable address is needed, it should be - /// 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 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 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; - - /// Specifies the MachineModuleInfo object. This is used for exception handling - /// purposes. - virtual void setModuleInfo(MachineModuleInfo* Info) = 0; -}; - -} // End llvm namespace - -#endif |