void emitCall(Asm& a, CppCall call) {
if (call.isDirect()) {
return emitCall(a, (TCA)call.getAddress());
} else if (call.isVirtual()) {
// Virtual call.
// Load method's address from proper offset off of object in rdi,
// using rax as scratch.
a. loadq (*rdi, rax);
a. call (rax[call.getOffset()]);
} else {
assert(call.isIndirect());
a. call (call.getReg());
}
}
TCA emitCall(vixl::MacroAssembler& a, CppCall call) {
if (call.isDirect()) {
a. Mov (rHostCallReg, reinterpret_cast<intptr_t>(call.getAddress()));
} else if (call.isVirtual()) {
a. Ldr (rHostCallReg, argReg(0)[0]);
a. Ldr (rHostCallReg, rHostCallReg[call.getOffset()]);
} else {
// call indirect currently not implemented. It'll be somthing like
// a.Br(x2a(call.getReg()))
not_implemented();
}
using namespace vixl;
auto fixupAddr = a.frontier();
a. HostCall(6);
// Note that the fixup address for a HostCall is directly *before* the
// HostCall, not after as in the native case. This is because, in simulation
// mode we look at the simulator's PC at the time the fixup is invoked, and it
// will still be pointing to the HostCall; it's not advanced past it until the
// host call returns. In the native case, by contrast, we'll be looking at
// return addresses, which point after the call.
return fixupAddr;
}