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Allocator
Class RuntimeCodeAllocator  

java.lang.Object
  Allocator.CodeAllocator
      Allocator.RuntimeCodeAllocator

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public class RuntimeCodeAllocator

extends CodeAllocator

RuntimeCodeAllocator

Version:

$Id: RuntimeCodeAllocator.java,v 1.19 2003/05/12 10:04:52 joewhaley Exp $

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Nested Class Summary
class	RuntimeCodeAllocator.Runtimex86CodeBuffer

 

Nested classes inherited from class Allocator.CodeAllocator

CodeAllocator.InstructionPointer, CodeAllocator.x86CodeBuffer

 

Field Summary
static int	BLOCK_SIZE           Size of blocks allocated from the OS.
private  Memory.CodeAddress	heapCurrent           Pointers to the start, current, and end of the heap.
private  Memory.CodeAddress	heapEnd           Pointers to the start, current, and end of the heap.
private  Memory.CodeAddress	heapFirst           Pointer to the first block.
private  Memory.CodeAddress	heapStart           Pointers to the start, current, and end of the heap.
(package private)  boolean	isGenerating
private  int	maxFreePrevious           Max memory free in all allocated blocks.

 

Fields inherited from class Allocator.CodeAllocator

_highAddress, _lowAddress, TRACE

 

Constructor Summary

RuntimeCodeAllocator()

 

Method Summary
private  void	allocateNewBlock(int blockSize)
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(Memory.Address addr1, Memory.Address addr2)           Patch the given address to refer to the other given address, in absolute terms.
void	patchRelativeOffset(Memory.CodeAddress code, Memory.CodeAddress target)           Patch the given code address to refer to the given code address, in relative terms.

 

Methods inherited from class 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

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heapStart

private Memory.CodeAddress heapStart

Pointers to the start, current, and end of the heap.

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heapCurrent

private Memory.CodeAddress heapCurrent

Pointers to the start, current, and end of the heap.

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heapEnd

private Memory.CodeAddress heapEnd

Pointers to the start, current, and end of the heap.

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heapFirst

private Memory.CodeAddress heapFirst

Pointer to the first block.

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maxFreePrevious

private int maxFreePrevious

Max memory free in all allocated blocks.

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isGenerating

volatile boolean isGenerating

Constructor Detail

RuntimeCodeAllocator

public RuntimeCodeAllocator()

Method Detail

init

public void init()
          throws java.lang.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

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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

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allocateNewBlock

private void allocateNewBlock(int blockSize)
                       throws java.lang.OutOfMemoryError

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patchAbsolute

public void patchAbsolute(Memory.Address addr1,
                          Memory.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

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patchRelativeOffset

public void patchRelativeOffset(Memory.CodeAddress code,
                                Memory.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

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endian2

public static short endian2(int k)

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