/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.ppc;
import org.jikesrvm.ArchitectureSpecific;
import org.jikesrvm.compilers.common.assembler.ppc.Assembler;
import org.jikesrvm.runtime.Entrypoints;
/**
* Generate a "trampoline" that jumps to the shared lazy compilation stub.
* This is then copied into individual TIBs.
*
* We do this to enable the optimizing compiler to use ptr equality of
* target instructions to imply logical (source) equality of target methods.
* This is used to perform guarded inlining using the "method test."
* Without per-class lazy compilation trampolines, ptr equality of target
* instructions does not imply source equality, since both targets may in fact
* be the globally shared lazy compilation stub.
*/
public abstract class LazyCompilationTrampoline implements BaselineConstants {
public static final ArchitectureSpecific.CodeArray instructions;
static {
Assembler asm = new ArchitectureSpecific.Assembler(0);
asm.emitLAddrToc(S0, Entrypoints.lazyMethodInvokerMethod.getOffset());
asm.emitMTCTR(S0);
asm.emitBCCTR();
instructions = asm.makeMachineCode().getInstructions();
}
}