/**
* Wrapper to save/restore volatile registers when a class needs to be dynamically
* loaded/resolved/etc.
*/
@Interruptible
public static void OPT_resolve() throws NoClassDefFoundError {
VM.disableGC();
// (1) Get the compiled method & compilerInfo for the (opt)
// compiled method that called OPT_resolve
LocalAddress fp = VM_Magic.getCallerFramePointer(VM_Magic.getFramePointer());
int cmid = VM_Magic.getCompiledMethodID(fp);
VM_OptCompiledMethod cm = (VM_OptCompiledMethod) VM_CompiledMethods.getCompiledMethod(cmid);
// (2) Get the return address
LocalAddress ip = VM_Magic.getReturnAddress(VM_Magic.getFramePointer());
Offset offset = cm.getInstructionOffset(ip);
VM.enableGC();
// (3) Call the routine in VM_OptLinker that does all the real work.
VM_OptLinker.resolveDynamicLink(cm, offset);
}
// Create a conflict resolution stub for the set of interface method signatures l.
//
public static ArchitectureSpecific.VM_CodeArray createStub(int[] sigIds, VM_Method[] targets) {
// (1) Create an assembler.
int numEntries = sigIds.length;
VM_Assembler asm =
new ArchitectureSpecific.VM_Assembler(numEntries); // pretend each entry is a bytecode
// (2) signatures must be in ascending order (to build binary search tree).
if (VM.VerifyAssertions) {
for (int i = 1; i < sigIds.length; i++) {
VM._assert(sigIds[i - 1] < sigIds[i]);
}
}
// (3) Assign synthetic bytecode numbers to each switch such that we'll generate them
// in ascending order. This lets us use the general forward branching mechanisms
// of the VM_Assembler.
int[] bcIndices = new int[numEntries];
assignBytecodeIndices(0, bcIndices, 0, numEntries - 1);
// (4) Generate the stub.
insertStubPrologue(asm);
insertStubCase(asm, sigIds, targets, bcIndices, 0, numEntries - 1);
ArchitectureSpecific.VM_CodeArray stub = asm.makeMachineCode().getInstructions();
// (5) synchronize icache with generated machine code that was written through dcache
if (VM.runningVM)
VM_Memory.sync(VM_Magic.objectAsAddress(stub), stub.length() << LG_INSTRUCTION_WIDTH);
return stub;
}
/** OSR invalidation being initiated. */
@Entrypoint
public static void OPT_yieldpointFromOsrOpt() {
LocalAddress fp = VM_Magic.getFramePointer();
VM_Processor.getCurrentProcessor().yieldToOSRRequested = true;
VM_GreenThread.yieldpoint(VM_Thread.OSROPT, fp);
}
/**
* Handle timer interrupt taken on loop backedge. This method is identical to the
* yieldpointFromBackedge() method used method used by the baseline compiler, except in the OPT
* compiler world, we also save the volatile registers.
*/
@Entrypoint
public static void OPT_yieldpointFromBackedge() {
LocalAddress fp = VM_Magic.getFramePointer();
VM_GreenThread.yieldpoint(VM_Thread.BACKEDGE, fp);
}
/**
* Handle timer interrupt taken in method epilogue. This method is identical to the
* yieldpointFromEpilogue() method used by the baseline compiler, except in the OPT compiler
* world, we also save the volatile registers.
*/
@Entrypoint
public static void OPT_yieldpointFromEpilogue() {
LocalAddress fp = VM_Magic.getFramePointer();
VM_GreenThread.yieldpoint(VM_Thread.EPILOGUE, fp);
}