73 lines
2.3 KiB
Rust
73 lines
2.3 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![allow(non_upper_case_globals)]
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use llvm::{Struct, Array, Attribute};
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use trans::cabi::{FnType, ArgType};
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use trans::context::CrateContext;
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use trans::type_::Type;
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// Data layout: e-p:32:32-i64:64-v128:32:128-n32-S128
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// See the https://github.com/kripken/emscripten-fastcomp-clang repository.
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// The class `EmscriptenABIInfo` in `/lib/CodeGen/TargetInfo.cpp` contains the ABI definitions.
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fn classify_ret_ty(ccx: &CrateContext, ty: Type) -> ArgType {
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match ty.kind() {
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Struct => {
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let field_types = ty.field_types();
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if field_types.len() == 1 {
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ArgType::direct(ty, Some(field_types[0]), None, None)
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} else {
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ArgType::indirect(ty, Some(Attribute::StructRet))
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}
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},
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Array => {
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ArgType::indirect(ty, Some(Attribute::StructRet))
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},
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_ => {
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let attr = if ty == Type::i1(ccx) { Some(Attribute::ZExt) } else { None };
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ArgType::direct(ty, None, None, attr)
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}
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}
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}
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fn classify_arg_ty(ccx: &CrateContext, ty: Type) -> ArgType {
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if ty.is_aggregate() {
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ArgType::indirect(ty, Some(Attribute::ByVal))
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} else {
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let attr = if ty == Type::i1(ccx) { Some(Attribute::ZExt) } else { None };
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ArgType::direct(ty, None, None, attr)
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}
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}
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pub fn compute_abi_info(ccx: &CrateContext,
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atys: &[Type],
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rty: Type,
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ret_def: bool) -> FnType {
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let mut arg_tys = Vec::new();
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for &aty in atys {
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let ty = classify_arg_ty(ccx, aty);
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arg_tys.push(ty);
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}
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let ret_ty = if ret_def {
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classify_ret_ty(ccx, rty)
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} else {
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ArgType::direct(Type::void(ccx), None, None, None)
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};
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return FnType {
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arg_tys: arg_tys,
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ret_ty: ret_ty,
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};
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}
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