109 lines
2.7 KiB
Rust
109 lines
2.7 KiB
Rust
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// 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 libc::c_uint;
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use std::cmp;
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use llvm;
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use llvm::{Integer, Pointer, Float, Double, Vector};
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use abi::{self, align_up_to, ArgType, FnType};
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use context::CrateContext;
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use type_::Type;
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fn ty_align(ty: Type) -> usize {
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abi::ty_align(ty, 4)
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}
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fn ty_size(ty: Type) -> usize {
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abi::ty_size(ty, 4)
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}
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fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
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if is_reg_ty(ret.ty) {
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ret.extend_integer_width_to(32);
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} else {
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ret.make_indirect(ccx);
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}
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}
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fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) {
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let orig_offset = *offset;
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let size = ty_size(arg.ty) * 8;
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let mut align = ty_align(arg.ty);
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align = cmp::min(cmp::max(align, 4), 8);
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*offset = align_up_to(*offset, align);
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*offset += align_up_to(size, align * 8) / 8;
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if !is_reg_ty(arg.ty) {
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arg.cast = Some(struct_ty(ccx, arg.ty));
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arg.pad = padding_ty(ccx, align, orig_offset);
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} else {
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arg.extend_integer_width_to(32);
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}
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}
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fn is_reg_ty(ty: Type) -> bool {
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return match ty.kind() {
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Integer
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| Pointer
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| Float
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| Double
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| Vector => true,
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_ => false
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};
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}
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fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> {
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if ((align - 1 ) & offset) > 0 {
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Some(Type::i32(ccx))
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} else {
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None
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}
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}
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fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> {
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let int_ty = Type::i32(ccx);
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let mut args = Vec::new();
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let mut n = size / 32;
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while n > 0 {
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args.push(int_ty);
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n -= 1;
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}
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let r = size % 32;
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if r > 0 {
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unsafe {
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args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
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}
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}
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args
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}
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fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
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let size = ty_size(ty) * 8;
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Type::struct_(ccx, &coerce_to_int(ccx, size), false)
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}
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pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
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if !fty.ret.is_ignore() {
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classify_ret_ty(ccx, &mut fty.ret);
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}
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let mut offset = if fty.ret.is_indirect() { 4 } else { 0 };
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for arg in &mut fty.args {
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if arg.is_ignore() { continue; }
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classify_arg_ty(ccx, arg, &mut offset);
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}
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}
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