/* generate yieldpoint without checking threadSwith request
*/
private static void expandUnconditionalYieldpoint(Instruction s, IR ir, RVMMethod meth) {
// split the basic block after the yieldpoint, create a new
// block at the end of the IR to hold the yieldpoint,
// remove the yieldpoint (to prepare to out it in the new block at the end)
BasicBlock thisBlock = s.getBasicBlock();
BasicBlock nextBlock = thisBlock.splitNodeWithLinksAt(s, ir);
BasicBlock yieldpoint = thisBlock.createSubBlock(s.getBytecodeIndex(), ir);
thisBlock.insertOut(yieldpoint);
yieldpoint.insertOut(nextBlock);
ir.cfg.addLastInCodeOrder(yieldpoint);
s.remove();
// change thread switch instruction into call to thread switch routine
// NOTE: must make s the call instruction: it is the GC point!
// must also inform the GCMap that s has been moved!!!
Offset offset = meth.getOffset();
LocationOperand loc = new LocationOperand(offset);
Operand guard = TG();
Operand target = MemoryOperand.D(Magic.getTocPointer().plus(offset), (byte) 4, loc, guard);
MIR_Call.mutate0(s, CALL_SAVE_VOLATILE, null, null, target, MethodOperand.STATIC(meth));
yieldpoint.appendInstruction(s);
ir.MIRInfo.gcIRMap.moveToEnd(s);
yieldpoint.appendInstruction(MIR_Branch.create(IA32_JMP, nextBlock.makeJumpTarget()));
// make a jump to yield block
thisBlock.appendInstruction(MIR_Branch.create(IA32_JMP, yieldpoint.makeJumpTarget()));
}
private static void expandYieldpoint(
Instruction s, IR ir, RVMMethod meth, IA32ConditionOperand ypCond) {
// split the basic block after the yieldpoint, create a new
// block at the end of the IR to hold the yieldpoint,
// remove the yieldpoint (to prepare to out it in the new block at the end)
BasicBlock thisBlock = s.getBasicBlock();
BasicBlock nextBlock = thisBlock.splitNodeWithLinksAt(s, ir);
BasicBlock yieldpoint = thisBlock.createSubBlock(s.getBytecodeIndex(), ir, 0);
thisBlock.insertOut(yieldpoint);
yieldpoint.insertOut(nextBlock);
ir.cfg.addLastInCodeOrder(yieldpoint);
s.remove();
// change thread switch instruction into call to thread switch routine
// NOTE: must make s the call instruction: it is the GC point!
// must also inform the GCMap that s has been moved!!!
Offset offset = meth.getOffset();
LocationOperand loc = new LocationOperand(offset);
Operand guard = TG();
Operand target;
if (JTOC_REGISTER == null) {
target = MemoryOperand.D(Magic.getTocPointer().plus(offset), (byte) 4, loc, guard);
} else {
target = MemoryOperand.BD(ir.regpool.makeTocOp().asRegister(), offset, (byte) 8, loc, guard);
}
MIR_Call.mutate0(s, CALL_SAVE_VOLATILE, null, null, target, MethodOperand.STATIC(meth));
yieldpoint.appendInstruction(s);
ir.MIRInfo.gcIRMap.moveToEnd(s);
yieldpoint.appendInstruction(MIR_Branch.create(IA32_JMP, nextBlock.makeJumpTarget()));
// Check to see if threadSwitch requested
Offset tsr = Entrypoints.takeYieldpointField.getOffset();
MemoryOperand M = MemoryOperand.BD(ir.regpool.makeTROp(), tsr, (byte) 4, null, null);
thisBlock.appendInstruction(MIR_Compare.create(IA32_CMP, M, IC(0)));
thisBlock.appendInstruction(
MIR_CondBranch.create(
IA32_JCC, ypCond, yieldpoint.makeJumpTarget(), BranchProfileOperand.never()));
}