78 lines
2.1 KiB
Rust
78 lines
2.1 KiB
Rust
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// Copyright 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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use driver::session::os_win32;
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use core::option::*;
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use lib::llvm::*;
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use lib::llvm::llvm::*;
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use super::cabi::*;
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use super::common::*;
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use super::machine::*;
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struct X86_ABIInfo {
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ccx: @CrateContext
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}
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impl ABIInfo for X86_ABIInfo {
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fn compute_info(&self,
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atys: &[TypeRef],
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rty: TypeRef,
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ret_def: bool) -> FnType {
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let mut arg_tys = do atys.map |a| {
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LLVMType { cast: false, ty: *a }
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};
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let mut ret_ty = LLVMType {
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cast: false,
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ty: rty
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};
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let mut attrs = do atys.map |_| {
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None
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};
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// Rules for returning structs taken from
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// http://www.angelcode.com/dev/callconv/callconv.html
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let sret = {
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let returning_a_struct = unsafe { LLVMGetTypeKind(rty) == Struct && ret_def };
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let big_struct = if self.ccx.sess.targ_cfg.os != os_win32 {
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true
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} else {
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llsize_of_alloc(self.ccx, rty) > 8
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};
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returning_a_struct && big_struct
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};
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if sret {
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let ret_ptr_ty = LLVMType {
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cast: false,
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ty: T_ptr(ret_ty.ty)
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};
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arg_tys = ~[ret_ptr_ty] + arg_tys;
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attrs = ~[Some(StructRetAttribute)] + attrs;
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ret_ty = LLVMType {
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cast: false,
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ty: T_void(),
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};
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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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attrs: attrs,
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sret: sret
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};
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}
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}
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pub fn abi_info(ccx: @CrateContext) -> @ABIInfo {
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return @X86_ABIInfo {
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ccx: ccx
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} as @ABIInfo;
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}
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