Method check_stack

winch/codegen/src/isa/x64/masm.rs:127–162

(&mut self, vmctx: Reg)

    }

    fn check_stack(&mut self, vmctx: Reg) -> Result<()> {
        let ptr_size: u8 = self.ptr_size.bytes().try_into().unwrap();

        self.with_scratch::<IntScratch, _>(|masm, scratch| {
            masm.load_ptr(
                masm.address_at_reg(vmctx, ptr_size.vmcontext_store_context().into())?,
                scratch.writable(),
            )?;

            masm.load_ptr(
                Address::offset(
                    scratch.inner(),
                    ptr_size.vmstore_context_stack_limit().into(),
                ),
                scratch.writable(),
            )?;

            masm.add_stack_max(scratch.inner());

            masm.asm.cmp_rr(scratch.inner(), regs::rsp(), masm.ptr_size);
            masm.asm.trapif(IntCmpKind::GtU, TrapCode::STACK_OVERFLOW);
            wasmtime_environ::error::Ok(())
        })?;

        // Emit unwind info.
        if self.shared_flags.unwind_info() {
            self.asm.unwind_inst(UnwindInst::DefineNewFrame {
                offset_upward_to_caller_sp: Self::ABI::arg_base_offset().into(),

                // The Winch calling convention has no callee-save registers, so nothing will be
                // clobbered.
                offset_downward_to_clobbers: 0,
            })
        }
        Ok(())
    }

    fn push(&mut self, reg: Reg, size: OperandSize) -> Result<StackSlot> {
        let bytes = match (reg.class(), size) {