103 lines
3.0 KiB
Rust
103 lines
3.0 KiB
Rust
// Copyright 2012 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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use lib::llvm::Attribute;
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use std::option;
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use middle::trans::context::CrateContext;
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use middle::trans::cabi_x86;
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use middle::trans::cabi_x86_64;
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use middle::trans::cabi_arm;
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use middle::trans::cabi_mips;
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use middle::trans::type_::Type;
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use syntax::abi::{X86, X86_64, Arm, Mips};
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#[deriving(Clone, Eq)]
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pub enum ArgKind {
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/// Pass the argument directly using the normal converted
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/// LLVM type or by coercing to another specified type
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Direct,
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/// Pass the argument indirectly via a hidden pointer
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Indirect
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}
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/// Information about how a specific C type
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/// should be passed to or returned from a function
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///
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/// This is borrowed from clang's ABIInfo.h
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#[deriving(Clone)]
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pub struct ArgType {
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kind: ArgKind,
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/// Original LLVM type
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ty: Type,
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/// Coerced LLVM Type
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cast: option::Option<Type>,
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/// Dummy argument, which is emitted before the real argument
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pad: option::Option<Type>,
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/// LLVM attribute of argument
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attr: option::Option<Attribute>
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}
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impl ArgType {
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pub fn direct(ty: Type, cast: option::Option<Type>,
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pad: option::Option<Type>,
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attr: option::Option<Attribute>) -> ArgType {
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ArgType {
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kind: Direct,
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ty: ty,
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cast: cast,
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pad: pad,
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attr: attr
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}
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}
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pub fn indirect(ty: Type, attr: option::Option<Attribute>) -> ArgType {
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ArgType {
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kind: Indirect,
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ty: ty,
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cast: option::None,
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pad: option::None,
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attr: attr
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}
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}
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pub fn is_direct(&self) -> bool {
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return self.kind == Direct;
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}
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pub fn is_indirect(&self) -> bool {
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return self.kind == Indirect;
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}
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}
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/// Metadata describing how the arguments to a native function
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/// should be passed in order to respect the native ABI.
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///
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/// I will do my best to describe this structure, but these
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/// comments are reverse-engineered and may be inaccurate. -NDM
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pub struct FnType {
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/// The LLVM types of each argument.
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arg_tys: ~[ArgType],
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/// LLVM return type.
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ret_ty: ArgType,
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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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match ccx.sess.targ_cfg.arch {
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X86 => cabi_x86::compute_abi_info(ccx, atys, rty, ret_def),
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X86_64 => cabi_x86_64::compute_abi_info(ccx, atys, rty, ret_def),
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Arm => cabi_arm::compute_abi_info(ccx, atys, rty, ret_def),
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Mips => cabi_mips::compute_abi_info(ccx, atys, rty, ret_def),
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}
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}
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