/**
* Change machine code that will be used by future executions of this method (ie. optimized <->
* non-optimized)
*
* <p>Side effect: updates JTOC or method dispatch tables ("type information blocks") for this
* class and its subclasses
*
* @param compiledMethod new machine code
*/
public final synchronized void replaceCompiledMethod(CompiledMethod compiledMethod) {
if (VM.VerifyAssertions) VM._assert(getDeclaringClass().isInstantiated());
// If we're replacing with a non-null compiledMethod, ensure that is still valid!
if (compiledMethod != null) {
synchronized (compiledMethod) {
if (compiledMethod.isInvalid()) return;
}
}
// Grab version that is being replaced
CompiledMethod oldCompiledMethod = currentCompiledMethod;
currentCompiledMethod = compiledMethod;
// Install the new method in JTOC/TIB. If virtual, will also replace in
// all subclasses that inherited the method.
getDeclaringClass().updateMethod(this);
// Replace constant-ified virtual method in JTOC if necessary
Offset jtocOffset = getJtocOffset();
if (jtocOffset.NE(Offset.zero())) {
Statics.setSlotContents(jtocOffset, getCurrentEntryCodeArray());
}
// Now that we've updated the JTOC/TIB, old version is obsolete
if (oldCompiledMethod != null) {
CompiledMethods.setCompiledMethodObsolete(oldCompiledMethod);
}
}
/** Generate machine code for this method if valid machine code doesn't already exist. */
public final synchronized void compile() {
if (VM.VerifyAssertions) VM._assert(getDeclaringClass().isResolved());
if (isCompiled()) return;
if (VM.TraceClassLoading && VM.runningVM)
VM.sysWrite("RVMMethod: (begin) compiling " + this + "\n");
CompiledMethod cm = genCode();
// Ensure that cm wasn't invalidated while it was being compiled.
synchronized (cm) {
if (cm.isInvalid()) {
CompiledMethods.setCompiledMethodObsolete(cm);
} else {
currentCompiledMethod = cm;
}
}
if (VM.TraceClassLoading && VM.runningVM)
VM.sysWrite("RVMMethod: (end) compiling " + this + "\n");
}