#include <MachineCodeEmitter.h>
Public Member Functions | |
| virtual | ~MachineCodeEmitter () |
| virtual void | startFunction (MachineFunction &F)=0 |
| virtual bool | finishFunction (MachineFunction &F)=0 |
| void | emitByte (uint8_t B) |
| void | emitWordLE (uint32_t W) |
| void | emitWordBE (uint32_t W) |
| void | emitDWordLE (uint64_t W) |
| void | emitDWordBE (uint64_t W) |
| void | emitAlignment (unsigned Alignment) |
| void | emitULEB128Bytes (uint64_t Value) |
| void | emitSLEB128Bytes (uint64_t Value) |
| void | emitString (const std::string &String) |
| void | emitInt32 (int32_t Value) |
| emitInt32 - Emit a int32 directive. | |
| void | emitInt64 (uint64_t Value) |
| emitInt64 - Emit a int64 directive. | |
| void | emitInt32At (uintptr_t *Addr, uintptr_t Value) |
| emitInt32At - Emit the Int32 Value in Addr. | |
| void | emitInt64At (uintptr_t *Addr, uintptr_t Value) |
| emitInt64At - Emit the Int64 Value in Addr. | |
| virtual void | processDebugLoc (DebugLoc DL, bool BeforePrintintInsn) |
| virtual void | emitLabel (MCSymbol *Label)=0 |
| emitLabel - Emits a label | |
| virtual void * | allocateSpace (uintptr_t Size, unsigned Alignment) |
| virtual void | StartMachineBasicBlock (MachineBasicBlock *MBB)=0 |
| virtual uintptr_t | getCurrentPCValue () const |
| virtual uintptr_t | getCurrentPCOffset () const |
| virtual bool | earlyResolveAddresses () const =0 |
| virtual void | addRelocation (const MachineRelocation &MR)=0 |
| virtual uintptr_t | getConstantPoolEntryAddress (unsigned Index) const =0 |
| FIXME: These should all be handled with relocations! | |
| virtual uintptr_t | getJumpTableEntryAddress (unsigned Index) const =0 |
| virtual uintptr_t | getMachineBasicBlockAddress (MachineBasicBlock *MBB) const =0 |
| virtual uintptr_t | getLabelAddress (MCSymbol *Label) const =0 |
| virtual void | setModuleInfo (MachineModuleInfo *Info)=0 |
Static Public Member Functions | |
| static void | emitWordLEInto (uint8_t *&Buf, uint32_t W) |
Protected Attributes | |
| uint8_t * | BufferBegin |
| uint8_t * | BufferEnd |
| uint8_t * | CurBufferPtr |
Detailed Description
MachineCodeEmitter - This class defines two sorts of methods: those for emitting the actual bytes of machine code, and those for emitting auxiliary 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.
Definition at line 52 of file MachineCodeEmitter.h.
Constructor & Destructor Documentation
| virtual llvm::MachineCodeEmitter::~MachineCodeEmitter | ( | ) | [inline, virtual] |
Definition at line 66 of file MachineCodeEmitter.h.
Member Function Documentation
| virtual void llvm::MachineCodeEmitter::addRelocation | ( | const MachineRelocation & | MR | ) | [pure virtual] |
addRelocation - Whenever a relocatable address is needed, it should be noted with this interface.
| virtual void* llvm::MachineCodeEmitter::allocateSpace | ( | uintptr_t | Size, |
| unsigned | Alignment | ||
| ) | [inline, virtual] |
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.
Definition at line 258 of file MachineCodeEmitter.h.
References BufferEnd, CurBufferPtr, and emitAlignment().
| virtual bool llvm::MachineCodeEmitter::earlyResolveAddresses | ( | ) | const [pure virtual] |
earlyResolveAddresses - True if the code emitter can use symbol addresses during code emission time. The JIT is capable of doing this because it creates jump tables or constant pools in memory on the fly while the object code emitters rely on a linker to have real addresses and should use relocations instead.
| void llvm::MachineCodeEmitter::emitAlignment | ( | unsigned | Alignment | ) | [inline] |
emitAlignment - Move the CurBufferPtr pointer up to the specified alignment (saturated to BufferEnd of course).
Definition at line 163 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
Referenced by allocateSpace().
| void llvm::MachineCodeEmitter::emitByte | ( | uint8_t | B | ) | [inline] |
emitByte - This callback is invoked when a byte needs to be written to the output stream.
Definition at line 84 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
Referenced by emitSLEB128Bytes(), emitString(), and emitULEB128Bytes().
| void llvm::MachineCodeEmitter::emitDWordBE | ( | uint64_t | W | ) | [inline] |
emitDWordBE - This callback is invoked when a 64-bit word needs to be written to the output stream in big-endian format.
Definition at line 146 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
| void llvm::MachineCodeEmitter::emitDWordLE | ( | uint64_t | W | ) | [inline] |
emitDWordLE - This callback is invoked when a 64-bit word needs to be written to the output stream in little-endian format.
Definition at line 128 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
| void llvm::MachineCodeEmitter::emitInt32 | ( | int32_t | Value | ) | [inline] |
emitInt32 - Emit a int32 directive.
Definition at line 215 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
| void llvm::MachineCodeEmitter::emitInt32At | ( | uintptr_t * | Addr, |
| uintptr_t | Value | ||
| ) | [inline] |
emitInt32At - Emit the Int32 Value in Addr.
Definition at line 235 of file MachineCodeEmitter.h.
References BufferBegin, and BufferEnd.
| void llvm::MachineCodeEmitter::emitInt64 | ( | uint64_t | Value | ) | [inline] |
emitInt64 - Emit a int64 directive.
Definition at line 225 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
| void llvm::MachineCodeEmitter::emitInt64At | ( | uintptr_t * | Addr, |
| uintptr_t | Value | ||
| ) | [inline] |
emitInt64At - Emit the Int64 Value in Addr.
Definition at line 241 of file MachineCodeEmitter.h.
References BufferBegin, and BufferEnd.
| virtual void llvm::MachineCodeEmitter::emitLabel | ( | MCSymbol * | Label | ) | [pure virtual] |
emitLabel - Emits a label
| void llvm::MachineCodeEmitter::emitSLEB128Bytes | ( | uint64_t | Value | ) | [inline] |
emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be written to the output stream.
Definition at line 190 of file MachineCodeEmitter.h.
References emitByte().
| void llvm::MachineCodeEmitter::emitString | ( | const std::string & | String | ) | [inline] |
emitString - This callback is invoked when a String needs to be written to the output stream.
Definition at line 205 of file MachineCodeEmitter.h.
References llvm::CallingConv::C, emitByte(), and N.
| void llvm::MachineCodeEmitter::emitULEB128Bytes | ( | uint64_t | Value | ) | [inline] |
emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be written to the output stream.
Definition at line 179 of file MachineCodeEmitter.h.
References emitByte().
| void llvm::MachineCodeEmitter::emitWordBE | ( | uint32_t | W | ) | [inline] |
emitWordBE - This callback is invoked when a 32-bit word needs to be written to the output stream in big-endian format.
Definition at line 114 of file MachineCodeEmitter.h.
References BufferEnd, and CurBufferPtr.
| void llvm::MachineCodeEmitter::emitWordLE | ( | uint32_t | W | ) | [inline] |
emitWordLE - This callback is invoked when a 32-bit word needs to be written to the output stream in little-endian format.
Definition at line 92 of file MachineCodeEmitter.h.
References BufferEnd, CurBufferPtr, and emitWordLEInto().
| static void llvm::MachineCodeEmitter::emitWordLEInto | ( | uint8_t *& | Buf, |
| uint32_t | W | ||
| ) | [inline, static] |
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.
Definition at line 104 of file MachineCodeEmitter.h.
Referenced by emitWordLE().
| virtual bool llvm::MachineCodeEmitter::finishFunction | ( | MachineFunction & | F | ) | [pure virtual] |
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 uintptr_t llvm::MachineCodeEmitter::getConstantPoolEntryAddress | ( | unsigned | Index | ) | const [pure virtual] |
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 uintptr_t llvm::MachineCodeEmitter::getCurrentPCOffset | ( | ) | const [inline, virtual] |
getCurrentPCOffset - Return the offset from the start of the emitted buffer that we are currently writing to.
Definition at line 289 of file MachineCodeEmitter.h.
References BufferBegin, and CurBufferPtr.
| virtual uintptr_t llvm::MachineCodeEmitter::getCurrentPCValue | ( | ) | const [inline, virtual] |
getCurrentPCValue - This returns the address that the next emitted byte will be output to.
Definition at line 283 of file MachineCodeEmitter.h.
References CurBufferPtr.
| virtual uintptr_t llvm::MachineCodeEmitter::getJumpTableEntryAddress | ( | unsigned | Index | ) | const [pure virtual] |
getJumpTableEntryAddress - Return the address of the jump table with index 'Index' in the function that last called initJumpTableInfo.
| virtual uintptr_t llvm::MachineCodeEmitter::getLabelAddress | ( | MCSymbol * | Label | ) | const [pure virtual] |
getLabelAddress - Return the address of the specified Label, only usable after the LabelID has been emitted.
| virtual uintptr_t llvm::MachineCodeEmitter::getMachineBasicBlockAddress | ( | MachineBasicBlock * | MBB | ) | const [pure virtual] |
getMachineBasicBlockAddress - Return the address of the specified MachineBasicBlock, only usable after the label for the MBB has been emitted.
| virtual void llvm::MachineCodeEmitter::processDebugLoc | ( | DebugLoc | DL, |
| bool | BeforePrintintInsn | ||
| ) | [inline, virtual] |
processDebugLoc - Records debug location information about a MachineInstruction. This is called before emitting any bytes associated with the instruction. Even if successive instructions have the same debug location, this method will be called for each one.
Definition at line 250 of file MachineCodeEmitter.h.
| virtual void llvm::MachineCodeEmitter::setModuleInfo | ( | MachineModuleInfo * | Info | ) | [pure virtual] |
Specifies the MachineModuleInfo object. This is used for exception handling purposes.
| virtual void llvm::MachineCodeEmitter::startFunction | ( | MachineFunction & | F | ) | [pure virtual] |
startFunction - This callback is invoked when the specified function is about to be code generated. This initializes the BufferBegin/End/Ptr fields.
| virtual void llvm::MachineCodeEmitter::StartMachineBasicBlock | ( | MachineBasicBlock * | MBB | ) | [pure virtual] |
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.
Member Data Documentation
uint8_t* llvm::MachineCodeEmitter::BufferBegin [protected] |
BufferBegin/BufferEnd - Pointers to the start and end of the memory allocated for this code buffer.
Definition at line 57 of file MachineCodeEmitter.h.
Referenced by emitInt32At(), emitInt64At(), and getCurrentPCOffset().
uint8_t * llvm::MachineCodeEmitter::BufferEnd [protected] |
Definition at line 57 of file MachineCodeEmitter.h.
Referenced by allocateSpace(), emitAlignment(), emitByte(), emitDWordBE(), emitDWordLE(), emitInt32(), emitInt32At(), emitInt64(), emitInt64At(), emitWordBE(), and emitWordLE().
uint8_t* llvm::MachineCodeEmitter::CurBufferPtr [protected] |
CurBufferPtr - Pointer to the next byte of memory to fill when emitting code. This is guaranteed 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).
Definition at line 63 of file MachineCodeEmitter.h.
Referenced by allocateSpace(), emitAlignment(), emitByte(), emitDWordBE(), emitDWordLE(), emitInt32(), emitInt64(), emitWordBE(), emitWordLE(), getCurrentPCOffset(), and getCurrentPCValue().
The documentation for this class was generated from the following files:
1.7.6.1