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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. // Reference: RISC-V ELF psABI specification // https://github.com/riscv/riscv-elf-psabi-doc use abi::call::{ArgType, FnType}; fn classify_ret_ty<Ty>(arg: &mut ArgType<Ty>, xlen: u64) { // "Scalars wider than 2✕XLEN are passed by reference and are replaced in // the argument list with the address." // "Aggregates larger than 2✕XLEN bits are passed by reference and are // replaced in the argument list with the address, as are C++ aggregates // with nontrivial copy constructors, destructors, or vtables." if arg.layout.size.bits() > 2 * xlen { arg.make_indirect(); } // "When passed in registers, scalars narrower than XLEN bits are widened // according to the sign of their type up to 32 bits, then sign-extended to // XLEN bits." arg.extend_integer_width_to(xlen); // this method only affects integer scalars } fn classify_arg_ty<Ty>(arg: &mut ArgType<Ty>, xlen: u64) { // "Scalars wider than 2✕XLEN are passed by reference and are replaced in // the argument list with the address." // "Aggregates larger than 2✕XLEN bits are passed by reference and are // replaced in the argument list with the address, as are C++ aggregates // with nontrivial copy constructors, destructors, or vtables." if arg.layout.size.bits() > 2 * xlen { arg.make_indirect(); } // "When passed in registers, scalars narrower than XLEN bits are widened // according to the sign of their type up to 32 bits, then sign-extended to // XLEN bits." arg.extend_integer_width_to(xlen); // this method only affects integer scalars } pub fn compute_abi_info<Ty>(fty: &mut FnType<Ty>, xlen: u64) { if !fty.ret.is_ignore() { classify_ret_ty(&mut fty.ret, xlen); } for arg in &mut fty.args { if arg.is_ignore() { continue; } classify_arg_ty(arg, xlen); } }