joeq.Allocator
Class RuntimeCodeAllocator

java.lang.Object
  joeq.Allocator.CodeAllocator
      joeq.Allocator.RuntimeCodeAllocator

public class RuntimeCodeAllocator
extends CodeAllocator

RuntimeCodeAllocator

Version:

$Id: RuntimeCodeAllocator.java,v 1.22 2004/09/30 03:35:30 joewhaley Exp $

Author:

John Whaley

Nested Class Summary

class

RuntimeCodeAllocator.Runtimex86CodeBuffer

Nested classes/interfaces inherited from class joeq.Allocator.CodeAllocator

CodeAllocator.InstructionPointer, CodeAllocator.x86CodeBuffer

Field Summary

static int

BLOCK_SIZE Size of blocks allocated from the OS.

Fields inherited from class joeq.Allocator.CodeAllocator

_class, _compiledMethods, _highAddress, _lowAddress, compiledMethods, TRACE

Constructor Summary

RuntimeCodeAllocator()

Method Summary

static short	endian2(int k)
CodeAllocator.x86CodeBuffer	getCodeBuffer(int estimatedSize, int offset, int alignment) Allocate a code buffer of the given estimated size, such that the given offset will have the given alignment.
void	init() Initialize this code allocator.
void	patchAbsolute(Address addr1, Address addr2) Patch the given address to refer to the other given address, in absolute terms.
void	patchRelativeOffset(CodeAddress code, CodeAddress target) Patch the given code address to refer to the given code address, in relative terms.

Methods inherited from class joeq.Allocator.CodeAllocator

getCodeContaining, getCompiledMethods, getHighAddress, getLowAddress, getNumberOfCompiledMethods, initializeCompiledMethodMap, registerCode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BLOCK_SIZE

public static final int BLOCK_SIZE

Size of blocks allocated from the OS.

See Also:

Constant Field Values

Constructor Detail

RuntimeCodeAllocator

public RuntimeCodeAllocator()

Method Detail

init

public void init()
          throws OutOfMemoryError

Description copied from class: CodeAllocator

Initialize this code allocator. This method is always called before the code allocator is actually used.

Specified by:

init in class CodeAllocator

Throws:

OutOfMemoryError

getCodeBuffer

public CodeAllocator.x86CodeBuffer getCodeBuffer(int estimatedSize,
                                                 int offset,
                                                 int alignment)

Allocate a code buffer of the given estimated size, such that the given offset will have the given alignment. It is legal for code to exceed the estimated size, but the cost may be high (i.e. it may require recopying of the buffer.)

Specified by:

getCodeBuffer in class CodeAllocator

Parameters:

estimatedSize - estimated size, in bytes, of desired code buffer

offset - desired offset to align to

alignment - desired alignment, or 0 if don't care

Returns:

the new code buffer

patchAbsolute

public void patchAbsolute(Address addr1,
                          Address addr2)

Description copied from class: CodeAllocator

Patch the given address to refer to the other given address, in absolute terms. This is used to patch heap address references in the code, and code references in the heap.

Specified by:

patchAbsolute in class CodeAllocator

Parameters:

addr1 - address to patch

addr2 - address to patch to

patchRelativeOffset

public void patchRelativeOffset(CodeAddress code,
                                CodeAddress target)

Description copied from class: CodeAllocator

Patch the given code address to refer to the given code address, in relative terms. This is used to patch branch targets in the code.

Specified by:

patchRelativeOffset in class CodeAllocator

Parameters:

code - code address to patch

target - code address to patch to

endian2

public static short endian2(int k)