llvm::TargetJITInfo Class Reference

#include <TargetJITInfo.h>

Inheritance diagram for llvm::TargetJITInfo:

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Collaboration diagram for llvm::TargetJITInfo:

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List of all members.

Public Types
typedef void(*	LazyResolverFn )()
typedef void *(*	JITCompilerFn )(void *)
Public Member Functions
virtual	~TargetJITInfo ()
virtual void	replaceMachineCodeForFunction (void *Old, void *New)=0
virtual void *	emitGlobalValueIndirectSym (const GlobalValue *GV, void *ptr, MachineCodeEmitter &MCE)
virtual void *	emitFunctionStub (const Function *F, void *Fn, MachineCodeEmitter &MCE)
virtual uintptr_t	getPICJumpTableEntry (uintptr_t BB, uintptr_t JTBase)
virtual LazyResolverFn	getLazyResolverFunction (JITCompilerFn)
virtual void	relocate (void *Function, MachineRelocation *MR, unsigned NumRelocs, unsigned char *GOTBase)
virtual char *	allocateThreadLocalMemory (size_t size)
bool	needsGOT () const
	needsGOT - Allows a target to specify that it would like the
virtual bool	hasCustomConstantPool () const
virtual bool	hasCustomJumpTables () const
virtual bool	allocateSeparateGVMemory () const
Protected Attributes
bool	useGOT

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Detailed Description

TargetJITInfo - Target specific information required by the Just-In-Time code generator.

Definition at line 31 of file TargetJITInfo.h.

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Member Typedef Documentation

typedef void(* llvm::TargetJITInfo::LazyResolverFn)()

LazyResolverFn - This typedef is used to represent the function that unresolved call points should invoke. This is a target specific function that knows how to walk the stack and find out which stub the call is coming from.

typedef void*(* llvm::TargetJITInfo::JITCompilerFn)(void *)

JITCompilerFn - This typedef is used to represent the JIT function that lazily compiles the function corresponding to a stub. The JIT keeps track of the mapping between stubs and LLVM Functions, the target provides the ability to figure out the address of a stub that is called by the LazyResolverFn.

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Constructor & Destructor Documentation

virtual llvm::TargetJITInfo::~TargetJITInfo

(

)

[inline, virtual]

Definition at line 33 of file TargetJITInfo.h.

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Member Function Documentation

virtual void llvm::TargetJITInfo::replaceMachineCodeForFunction	(	void *	Old,
		void *	New
	)			[pure virtual]

replaceMachineCodeForFunction - Make it so that calling the function whose machine code is at OLD turns into a call to NEW, perhaps by overwriting OLD with a branch to NEW. This is used for self-modifying code.

Implemented in llvm::AlphaJITInfo, llvm::ARMJITInfo, llvm::PPCJITInfo, and llvm::X86JITInfo.

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

virtual void* llvm::TargetJITInfo::emitGlobalValueIndirectSym	(	const GlobalValue *	GV,
		void *	ptr,
		MachineCodeEmitter &	MCE
	)			[inline, virtual]

emitGlobalValueIndirectSym - Use the specified MachineCodeEmitter object to emit an indirect symbol which contains the address of the specified ptr.

Reimplemented in llvm::ARMJITInfo, and llvm::X86JITInfo.

Definition at line 45 of file TargetJITInfo.h.

virtual void* llvm::TargetJITInfo::emitFunctionStub	(	const Function *	F,
		void *	Fn,
		MachineCodeEmitter &	MCE
	)			[inline, virtual]

emitFunctionStub - Use the specified MachineCodeEmitter object to emit a small native function that simply calls the function at the specified address. Return the address of the resultant function.

Reimplemented in llvm::AlphaJITInfo, llvm::ARMJITInfo, llvm::PPCJITInfo, and llvm::X86JITInfo.

Definition at line 54 of file TargetJITInfo.h.

virtual uintptr_t llvm::TargetJITInfo::getPICJumpTableEntry	(	uintptr_t	BB,
		uintptr_t	JTBase
	)			[inline, virtual]

getPICJumpTableEntry - Returns the value of the jumptable entry for the specific basic block.

Reimplemented in llvm::X86JITInfo.

Definition at line 62 of file TargetJITInfo.h.

virtual LazyResolverFn llvm::TargetJITInfo::getLazyResolverFunction

(

JITCompilerFn

)

[inline, virtual]

getLazyResolverFunction - This method is used to initialize the JIT, giving the target the function that should be used to compile a function, and giving the JIT the target function used to do the lazy resolving.

Definition at line 84 of file TargetJITInfo.h.

virtual void llvm::TargetJITInfo::relocate	(	void *	Function,
		MachineRelocation *	MR,
		unsigned	NumRelocs,
		unsigned char *	GOTBase
	)			[inline, virtual]

relocate - Before the JIT can run a block of code that has been emitted, it must rewrite the code to contain the actual addresses of any referenced global symbols.

Reimplemented in llvm::AlphaJITInfo, llvm::ARMJITInfo, llvm::PPCJITInfo, and llvm::X86JITInfo.

Definition at line 92 of file TargetJITInfo.h.

virtual char* llvm::TargetJITInfo::allocateThreadLocalMemory

(

size_t

size

)

[inline, virtual]

allocateThreadLocalMemory - Each target has its own way of handling thread local variables. This method returns a value only meaningful to the target.

Reimplemented in llvm::X86JITInfo.

Definition at line 101 of file TargetJITInfo.h.

Referenced by llvm::JIT::getMemoryForGV(), and llvm::JIT::getOrEmitGlobalVariable().

bool llvm::TargetJITInfo::needsGOT

(

)

const [inline]

needsGOT - Allows a target to specify that it would like the

Definition at line 108 of file TargetJITInfo.h.

References useGOT.

virtual bool llvm::TargetJITInfo::hasCustomConstantPool

(

)

const [inline, virtual]

hasCustomConstantPool - Allows a target to specify that constant pool address resolution is handled by the target.

Reimplemented in llvm::ARMJITInfo.

Definition at line 112 of file TargetJITInfo.h.

virtual bool llvm::TargetJITInfo::hasCustomJumpTables

(

)

const [inline, virtual]

hasCustomJumpTables - Allows a target to specify that jumptables are emitted by the target.

Reimplemented in llvm::ARMJITInfo.

Definition at line 116 of file TargetJITInfo.h.

virtual bool llvm::TargetJITInfo::allocateSeparateGVMemory

(

)

const [inline, virtual]

allocateSeparateGVMemory - If true, globals should be placed in separately allocated heap memory rather than in the same code memory allocated by MachineCodeEmitter.

Reimplemented in llvm::ARMJITInfo.

Definition at line 121 of file TargetJITInfo.h.

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

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Member Data Documentation

bool llvm::TargetJITInfo::useGOT [protected]

Definition at line 123 of file TargetJITInfo.h.

Referenced by llvm::AlphaJITInfo::AlphaJITInfo(), llvm::ARMJITInfo::ARMJITInfo(), needsGOT(), llvm::PPCJITInfo::PPCJITInfo(), and llvm::X86JITInfo::X86JITInfo().

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

• TargetJITInfo.h