/**
* Logic to select the appropriate guarding mechanism for the edge from caller to callee according
* to the controlling {@link OPT_Options}. If we are using IG_CODE_PATCH, then this method also
* records the required dependency. Precondition: lock on {@link VM_Class#OptCLDepManager} is
* held.
*
* @param caller The caller method
* @param callee The callee method
* @param codePatchSupported Can we use code patching at this call site?
*/
private byte chooseGuard(
VM_Method caller,
VM_Method singleImpl,
VM_Method callee,
OPT_CompilationState state,
boolean codePatchSupported) {
byte guard = state.getOptions().INLINING_GUARD;
if (codePatchSupported) {
if (VM.VerifyAssertions && VM.runningVM) {
VM._assert(VM_Lock.owns(VM_Class.OptCLDepManager));
}
if (guard == OPT_Options.IG_CODE_PATCH) {
if (OPT_ClassLoadingDependencyManager.TRACE || OPT_ClassLoadingDependencyManager.DEBUG) {
VM_Class.OptCLDepManager.report(
"CODE PATCH: Inlined " + singleImpl + " into " + caller + "\n");
}
VM_Class.OptCLDepManager.addNotOverriddenDependency(callee, state.getCompiledMethod());
}
} else if (guard == OPT_Options.IG_CODE_PATCH) {
guard = OPT_Options.IG_METHOD_TEST;
}
if (guard == OPT_Options.IG_METHOD_TEST && singleImpl.getDeclaringClass().isFinal()) {
// class test is more efficient and just as effective
guard = OPT_Options.IG_CLASS_TEST;
}
return guard;
}
