org.jikesrvm.osr

Class SpecialCompiler

java.lang.Object

org.jikesrvm.osr.SpecialCompiler

public class SpecialCompiler
extends Object

SpecialCompiler is a wrapper for compiling specialized byte code. It accepts an instance of ExecutionState, generates the specialized byte code, and compiles it to machine code instructions.

Constructor Summary

Constructors

Constructor and Description
SpecialCompiler()

Method Summary

Modifier and Type	Method and Description
static CompiledMethod	baselineCompile(ExecutionState state) Compiles the method with the baseline compiler.
static CompiledMethod	optCompile(ExecutionState state) generate prologue PSEUDO_bytecode from the state.
static CompiledMethod	recompileState(ExecutionState state, boolean invalidate) recompile an execution state

Methods inherited from class java.lang.Object

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

Constructor Detail

SpecialCompiler

public SpecialCompiler()

Method Detail

recompileState

public static CompiledMethod recompileState(ExecutionState state,
                                            boolean invalidate)

recompile an execution state

Parameters:

state - a list of execution states

invalidate - Is this an invalidation?

Returns:

the compiled method for the root state

baselineCompile

public static CompiledMethod baselineCompile(ExecutionState state)

Compiles the method with the baseline compiler.

1. generate prologue (PSEUDO_bytecode) from the state.
2. make up new byte code with prologue.
3. set method's bytecode to the specilizaed byte code.
4. call BaselineCompilerImpl.compile, the 'compile' method is customized to process pseudo instructions, and it will reset the byte code to the original one, and adjust the map from bytecode to the generated machine code. then the reference map can be generated corrected relying on the original bytecode.

NOTE: this is different from optCompile which resets the bytecode after compilation. I believe this minimizes the work to change both compilers.

Parameters:

state - the execution state for the compilation

Returns:

the compiled method produced by the baseline compiler

optCompile

public static CompiledMethod optCompile(ExecutionState state)

1. generate prologue PSEUDO_bytecode from the state.
2. make new bytecodes with prologue.
3. set method's bytecode to specialized one.
4. adjust exception map, line number map.
5. compile the method.
6. restore bytecode, exception, linenumber map to the original one.

Parameters:

state - the execution state for the compilation

Returns:

the compiled method produced by the optimizing compiler