#include <JITCodeEmitter.h>

Inheritance diagram for llvm::JITCodeEmitter:

Collaboration diagram for llvm::JITCodeEmitter:

Public Member Functions
virtual	~JITCodeEmitter ()

virtual void	startFunction (MachineFunction &F)=0

virtual bool	finishFunction (MachineFunction &F)=0

virtual void *	allocIndirectGV (const GlobalValue GV, const uint8_t Buffer, size_t Size, unsigned Alignment)=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	emitAlignmentWithFill (unsigned Alignment, uint8_t Fill)

void	emitULEB128Bytes (uint64_t Value, unsigned PadTo=0)

void	emitSLEB128Bytes (int64_t Value)

void	emitString (const std::string &String)

void	emitInt32 (uint32_t Value)
	emitInt32 - Emit a int32 directive. More...

void	emitInt64 (uint64_t Value)
	emitInt64 - Emit a int64 directive. More...

void	emitInt32At (uintptr_t *Addr, uintptr_t Value)
	emitInt32At - Emit the Int32 Value in Addr. More...

void	emitInt64At (uintptr_t *Addr, uintptr_t Value)
	emitInt64At - Emit the Int64 Value in Addr. More...

virtual void	emitLabel (MCSymbol *Label)=0
	emitLabel - Emits a label More...

virtual void *	allocateSpace (uintptr_t Size, unsigned Alignment)

virtual void *	allocateGlobal (uintptr_t Size, unsigned Alignment)=0

virtual void	StartMachineBasicBlock (MachineBasicBlock *MBB)=0

virtual uintptr_t	getCurrentPCValue () const

uintptr_t	getCurrentPCOffset () const

bool	earlyResolveAddresses () const

virtual void	addRelocation (const MachineRelocation &MR)=0

virtual uintptr_t	getConstantPoolEntryAddress (unsigned Index) const =0
	FIXME: These should all be handled with relocations! More...

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

virtual DenseMap< MCSymbol , uintptr_t >	getLabelLocations ()

Public Member Functions inherited from llvm::MachineCodeEmitter
virtual	~MachineCodeEmitter ()

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. More...

void	emitInt64 (uint64_t Value)
	emitInt64 - Emit a int64 directive. More...

void	emitInt32At (uintptr_t *Addr, uintptr_t Value)
	emitInt32At - Emit the Int32 Value in Addr. More...

void	emitInt64At (uintptr_t *Addr, uintptr_t Value)
	emitInt64At - Emit the Int64 Value in Addr. More...

virtual void	processDebugLoc (DebugLoc DL, bool BeforePrintintInsn)

Additional Inherited Members
Static Public Member Functions inherited from llvm::MachineCodeEmitter
static void	emitWordLEInto (uint8_t *&Buf, uint32_t W)

Protected Attributes inherited from llvm::MachineCodeEmitter
uint8_t *	BufferBegin

uint8_t *	BufferEnd

uint8_t *	CurBufferPtr

Detailed Description

JITCodeEmitter - 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 53 of file JITCodeEmitter.h.

Constructor & Destructor Documentation

virtual llvm::JITCodeEmitter::~JITCodeEmitter ( )

inlinevirtual

Definition at line 56 of file JITCodeEmitter.h.

Member Function Documentation

virtual void llvm::JITCodeEmitter::addRelocation ( const MachineRelocation & MR )

pure virtual

addRelocation - Whenever a relocatable address is needed, it should be noted with this interface.

Implements llvm::MachineCodeEmitter.

virtual void* llvm::JITCodeEmitter::allocateGlobal	(	uintptr_t	Size,
		unsigned	Alignment
	)

pure virtual

allocateGlobal - Allocate memory for a global. Unlike allocateSpace, this method does not allocate memory in the current output buffer, because a global may live longer than the current function.

Referenced by llvm::JIT::getMemoryForGV().

virtual void* llvm::JITCodeEmitter::allocateSpace	(	uintptr_t	Size,
		unsigned	Alignment
	)

inlinevirtual

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.

Reimplemented from llvm::MachineCodeEmitter.

Definition at line 256 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, llvm::MachineCodeEmitter::CurBufferPtr, and emitAlignment().

Referenced by llvm::JIT::getMemoryForGV().

virtual void* llvm::JITCodeEmitter::allocIndirectGV	(	const GlobalValue *	GV,
		const uint8_t *	Buffer,
		size_t	Size,
		unsigned	Alignment
	)

pure virtual

allocIndirectGV - Allocates and fills storage for an indirect GlobalValue, and returns the address.

Referenced by llvm::X86JITInfo::emitGlobalValueIndirectSym(), and llvm::ARMJITInfo::emitGlobalValueIndirectSym().

bool llvm::JITCodeEmitter::earlyResolveAddresses ( ) const

inlinevirtual

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.

Implements llvm::MachineCodeEmitter.

Definition at line 301 of file JITCodeEmitter.h.

void llvm::JITCodeEmitter::emitAlignment ( unsigned Alignment )

inline

emitAlignment - Move the CurBufferPtr pointer up to the specified alignment (saturated to BufferEnd of course).

Definition at line 151 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, llvm::MachineCodeEmitter::CurBufferPtr, and llvm::RoundUpToAlignment().

Referenced by allocateSpace(), llvm::SparcJITInfo::emitFunctionStub(), llvm::MipsJITInfo::emitFunctionStub(), llvm::X86JITInfo::emitFunctionStub(), and llvm::ARMJITInfo::emitFunctionStub().

void llvm::JITCodeEmitter::emitAlignmentWithFill	(	unsigned	Alignment,
		uint8_t	Fill
	)

inline

emitAlignmentWithFill - Similar to emitAlignment, except that the extra bytes are filled with the provided byte.

Definition at line 160 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, llvm::MachineCodeEmitter::CurBufferPtr, and llvm::RoundUpToAlignment().

void llvm::JITCodeEmitter::emitByte ( uint8_t B )

inline

emitByte - This callback is invoked when a byte needs to be written to the output stream.

Definition at line 80 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

Referenced by llvm::X86JITInfo::emitFunctionStub(), emitSLEB128Bytes(), emitString(), and emitULEB128Bytes().

void llvm::JITCodeEmitter::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 134 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

void llvm::JITCodeEmitter::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 116 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

void llvm::JITCodeEmitter::emitInt32 ( uint32_t Value )

inline

emitInt32 - Emit a int32 directive.

Definition at line 218 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

void llvm::JITCodeEmitter::emitInt32At	(	uintptr_t *	Addr,
		uintptr_t	Value
	)

inline

emitInt32At - Emit the Int32 Value in Addr.

Definition at line 238 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferBegin, and llvm::MachineCodeEmitter::BufferEnd.

void llvm::JITCodeEmitter::emitInt64 ( uint64_t Value )

inline

emitInt64 - Emit a int64 directive.

Definition at line 228 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

void llvm::JITCodeEmitter::emitInt64At	(	uintptr_t *	Addr,
		uintptr_t	Value
	)

inline

emitInt64At - Emit the Int64 Value in Addr.

Definition at line 244 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferBegin, and llvm::MachineCodeEmitter::BufferEnd.

virtual void llvm::JITCodeEmitter::emitLabel ( MCSymbol * Label )

pure virtual

emitLabel - Emits a label

Implements llvm::MachineCodeEmitter.

void llvm::JITCodeEmitter::emitSLEB128Bytes ( int64_t Value )

inline

emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be written to the output stream.

Definition at line 194 of file JITCodeEmitter.h.

References emitByte().

void llvm::JITCodeEmitter::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 209 of file JITCodeEmitter.h.

References llvm::CallingConv::C, emitByte(), and N.

void llvm::JITCodeEmitter::emitULEB128Bytes	(	uint64_t	Value,
		unsigned	PadTo = `0`
	)

inline

emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be written to the output stream.

Definition at line 176 of file JITCodeEmitter.h.

References emitByte().

void llvm::JITCodeEmitter::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 102 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

Referenced by llvm::PPCJITInfo::emitFunctionStub(), llvm::SparcJITInfo::emitFunctionStub(), and llvm::MipsJITInfo::emitFunctionStub().

void llvm::JITCodeEmitter::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 88 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferEnd, and llvm::MachineCodeEmitter::CurBufferPtr.

Referenced by llvm::MipsJITInfo::emitFunctionStub(), llvm::X86JITInfo::emitFunctionStub(), and llvm::ARMJITInfo::emitFunctionStub().

virtual bool llvm::JITCodeEmitter::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.

Implements llvm::MachineCodeEmitter.

virtual uintptr_t llvm::JITCodeEmitter::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.

Implements llvm::MachineCodeEmitter.

uintptr_t llvm::JITCodeEmitter::getCurrentPCOffset ( ) const

inlinevirtual

getCurrentPCOffset - Return the offset from the start of the emitted buffer that we are currently writing to.

Reimplemented from llvm::MachineCodeEmitter.

Definition at line 292 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::BufferBegin, and llvm::MachineCodeEmitter::CurBufferPtr.

virtual uintptr_t llvm::JITCodeEmitter::getCurrentPCValue ( ) const

inlinevirtual

getCurrentPCValue - This returns the address that the next emitted byte will be output to.

Reimplemented from llvm::MachineCodeEmitter.

Definition at line 286 of file JITCodeEmitter.h.

References llvm::MachineCodeEmitter::CurBufferPtr.

Referenced by llvm::PPCJITInfo::emitFunctionStub(), llvm::SparcJITInfo::emitFunctionStub(), llvm::MipsJITInfo::emitFunctionStub(), llvm::X86JITInfo::emitFunctionStub(), and llvm::ARMJITInfo::emitFunctionStub().

virtual uintptr_t llvm::JITCodeEmitter::getJumpTableEntryAddress ( unsigned Index ) const

pure virtual

getJumpTableEntryAddress - Return the address of the jump table with index 'Index' in the function that last called initJumpTableInfo.

Implements llvm::MachineCodeEmitter.

virtual uintptr_t llvm::JITCodeEmitter::getLabelAddress ( MCSymbol * Label ) const

pure virtual

getLabelAddress - Return the address of the specified Label, only usable after the Label has been emitted.

Implements llvm::MachineCodeEmitter.

virtual DenseMap<MCSymbol*, uintptr_t>* llvm::JITCodeEmitter::getLabelLocations ( )

inlinevirtual

getLabelLocations - Return the label locations map of the label IDs to their address.

Definition at line 336 of file JITCodeEmitter.h.

virtual uintptr_t llvm::JITCodeEmitter::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.

Implements llvm::MachineCodeEmitter.

virtual void llvm::JITCodeEmitter::setModuleInfo ( MachineModuleInfo * Info )

pure virtual

Specifies the MachineModuleInfo object. This is used for exception handling purposes.

Implements llvm::MachineCodeEmitter.

virtual void llvm::JITCodeEmitter::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.

Implements llvm::MachineCodeEmitter.

virtual void llvm::JITCodeEmitter::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.

Implements llvm::MachineCodeEmitter.

The documentation for this class was generated from the following files:

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation