Method emit_compute_table_size

winch/codegen/src/codegen/mod.rs:1487–1506

Retrieves the size of the table, pushing the result to the value stack.

(&mut self, table_data: &TableData)

    /// Retrieves the size of the table, pushing the result to the value stack.
    pub fn emit_compute_table_size(&mut self, table_data: &TableData) -> Result<()> {
        let size = self.context.any_gpr(self.masm)?;
        let ptr_size: OperandSize = self.env.ptr_type().try_into()?;

        self.masm.with_scratch::<IntScratch, _>(|masm, scratch| {
            if let Some(offset) = table_data.import_from {
                masm.load_ptr(masm.address_at_vmctx(offset)?, scratch.writable())?;
            } else {
                masm.mov(scratch.writable(), vmctx!(M).into(), ptr_size)?;
            };

            let size_addr =
                masm.address_at_reg(scratch.inner(), table_data.current_elems_offset)?;
            masm.load(size_addr, writable!(size), table_data.current_elements_size)
        })?;

        let dst = TypedReg::new(table_data.index_type(), size);
        self.context.stack.push(dst.into());
        Ok(())
    }

    /// Retrieves the size of the memory, pushing the result to the value stack.
    fn load_memory_length(&mut self, heap_data: &HeapData, size_reg: Reg) -> Result<()> {