--- /dev/null
+// Copyright 2012 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.
+
+use core::{ptr, vec, uint};
+use core::option::*;
+use core::libc::c_uint;
+use lib::llvm::{llvm, TypeRef, ValueRef, Integer, Pointer, Float, Double};
+use lib::llvm::{Struct, Array, Attribute};
+use lib::llvm::{StructRetAttribute, ByValAttribute};
+use middle::trans::common::*;
+use middle::trans::cabi::*;
+
+fn align_up_to(off: uint, a: uint) -> uint {
+ return (off + a - 1u) / a * a;
+}
+
+fn align(off: uint, ty: TypeRef) -> uint {
+ let a = ty_align(ty);
+ return align_up_to(off, a);
+}
+
+fn struct_tys(ty: TypeRef) -> ~[TypeRef] {
+ unsafe {
+ let n = llvm::LLVMCountStructElementTypes(ty);
+ if (n == 0) {
+ return ~[];
+ }
+ let mut elts = vec::from_elem(n as uint, ptr::null());
+ llvm::LLVMGetStructElementTypes(ty,
+ ptr::to_mut_unsafe_ptr(&mut elts[0]));
+ return elts;
+ }
+}
+
+fn ty_align(ty: TypeRef) -> uint {
+ unsafe {
+ return match llvm::LLVMGetTypeKind(ty) {
+ Integer => {
+ ((llvm::LLVMGetIntTypeWidth(ty) as uint) + 7) / 8
+ }
+ Pointer => 4,
+ Float => 4,
+ Double => 8,
+ Struct => {
+ do vec::foldl(1, struct_tys(ty)) |a, t| {
+ uint::max(a, ty_align(*t))
+ }
+ }
+ Array => {
+ let elt = llvm::LLVMGetElementType(ty);
+ ty_align(elt)
+ }
+ _ => fail!(~"ty_size: unhandled type")
+ };
+ }
+}
+
+fn ty_size(ty: TypeRef) -> uint {
+ unsafe {
+ return match llvm::LLVMGetTypeKind(ty) {
+ Integer => {
+ ((llvm::LLVMGetIntTypeWidth(ty) as uint) + 7) / 8
+ }
+ Pointer => 4,
+ Float => 4,
+ Double => 8,
+ Struct => {
+ let size = do vec::foldl(0, struct_tys(ty)) |s, t| {
+ align(s, *t) + ty_size(*t)
+ };
+ align(size, ty)
+ }
+ Array => {
+ let len = llvm::LLVMGetArrayLength(ty) as uint;
+ let elt = llvm::LLVMGetElementType(ty);
+ let eltsz = ty_size(elt);
+ len * eltsz
+ }
+ _ => fail!(~"ty_size: unhandled type")
+ };
+ }
+}
+
+fn classify_ret_ty(ty: TypeRef) -> (LLVMType, Option<Attribute>) {
+ return if is_reg_ty(ty) {
+ (LLVMType { cast: false, ty: ty }, None)
+ } else {
+ (LLVMType { cast: false, ty: T_ptr(ty) }, Some(StructRetAttribute))
+ };
+}
+
+fn classify_arg_ty(ty: TypeRef,
+ offset: &mut uint) -> (LLVMType, Option<Attribute>) {
+ let orig_offset = *offset;
+ let size = ty_size(ty) * 8;
+ let mut align = ty_align(ty);
+
+ align = uint::min(uint::max(align, 4), 8);
+ *offset = align_up_to(*offset, align);
+ *offset += align_up_to(size, align * 8) / 8;
+
+ let padding = padding_ty(align, orig_offset);
+ return if !is_reg_ty(ty) {
+ (LLVMType {
+ cast: true,
+ ty: struct_ty(ty, padding, true)
+ }, None)
+ } else if padding.is_some() {
+ (LLVMType {
+ cast: true,
+ ty: struct_ty(ty, padding, false)
+ }, None)
+ } else {
+ (LLVMType { cast: false, ty: ty }, None)
+ };
+}
+
+fn is_reg_ty(ty: TypeRef) -> bool {
+ unsafe {
+ return match llvm::LLVMGetTypeKind(ty) {
+ Integer
+ | Pointer
+ | Float
+ | Double => true,
+ _ => false
+ };
+ }
+}
+
+fn padding_ty(align: uint, offset: uint) -> Option<TypeRef> {
+ if ((align - 1 ) & offset) > 0 {
+ return Some(T_i32());
+ }
+
+ return None;
+}
+
+fn coerce_to_int(size: uint) -> ~[TypeRef] {
+ let int_ty = T_i32();
+ let mut args = ~[];
+
+ let mut n = size / 32;
+ while n > 0 {
+ args.push(int_ty);
+ n -= 1;
+ }
+
+ let r = size % 32;
+ if r > 0 {
+ unsafe {
+ args.push(llvm::LLVMIntType(r as c_uint))
+ }
+ }
+
+ return args;
+}
+
+fn struct_ty(ty: TypeRef,
+ padding: Option<TypeRef>,
+ coerce: bool) -> TypeRef {
+ let size = ty_size(ty) * 8;
+ let mut fields = padding.map_default(~[], |p| ~[*p]);
+
+ if coerce {
+ fields = vec::append(fields, coerce_to_int(size));
+ } else {
+ fields.push(ty);
+ }
+
+ return T_struct(fields);
+}
+
+enum MIPS_ABIInfo { MIPS_ABIInfo }
+
+impl ABIInfo for MIPS_ABIInfo {
+ fn compute_info(&self,
+ atys: &[TypeRef],
+ rty: TypeRef,
+ ret_def: bool) -> FnType {
+ let mut (ret_ty, ret_attr) = if ret_def {
+ classify_ret_ty(rty)
+ } else {
+ (LLVMType { cast: false, ty: T_void() }, None)
+ };
+
+ let sret = ret_attr.is_some();
+ let mut arg_tys = ~[];
+ let mut attrs = ~[];
+ let mut offset = if sret { 4 } else { 0 };
+
+ for atys.each() |aty| {
+ let (ty, attr) = classify_arg_ty(*aty, &mut offset);
+ arg_tys.push(ty);
+ attrs.push(attr);
+ };
+
+ if sret {
+ arg_tys = vec::append(~[ret_ty], arg_tys);
+ attrs = vec::append(~[ret_attr], attrs);
+ ret_ty = LLVMType { cast: false, ty: T_void() };
+ }
+
+ return FnType {
+ arg_tys: arg_tys,
+ ret_ty: ret_ty,
+ attrs: attrs,
+ sret: sret
+ };
+ }
+}
+
+pub fn mips_abi_info() -> @ABIInfo {
+ return @MIPS_ABIInfo as @ABIInfo;
+}
projects / rust.git / commitdiff