rust/src/rustc/middle/trans/foreign.rs

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// The classification code for the x86_64 ABI is taken from the clay language
// https://github.com/jckarter/clay/blob/master/compiler/src/externals.cpp
use driver::session::arch_x86_64;
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use syntax::codemap::span;
use libc::c_uint;
use syntax::{attr, ast_map};
use lib::llvm::{ llvm, TypeRef, ValueRef, Integer, Pointer, Float, Double,
Struct, Array, ModuleRef, CallConv, Attribute,
StructRetAttribute, ByValAttribute,
SequentiallyConsistent, Acquire, Release, Xchg };
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use syntax::{ast, ast_util};
use back::{link, abi};
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use common::*;
use build::*;
use base::*;
use type_of::*;
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use std::map::HashMap;
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use util::ppaux::ty_to_str;
use datum::*;
use callee::*;
use expr::{Dest, Ignore};
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use ty::{FnTyBase, FnMeta, FnSig};
export link_name, trans_foreign_mod, register_foreign_fn, trans_foreign_fn,
trans_intrinsic;
enum x86_64_reg_class {
no_class,
integer_class,
sse_fs_class,
sse_fv_class,
sse_ds_class,
sse_dv_class,
sse_int_class,
sseup_class,
x87_class,
x87up_class,
complex_x87_class,
memory_class
}
impl x86_64_reg_class : cmp::Eq {
pure fn eq(other: &x86_64_reg_class) -> bool {
(self as uint) == ((*other) as uint)
}
pure fn ne(other: &x86_64_reg_class) -> bool { !self.eq(other) }
}
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fn is_sse(++c: x86_64_reg_class) -> bool {
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return match c {
sse_fs_class | sse_fv_class |
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sse_ds_class | sse_dv_class => true,
_ => false
};
}
fn is_ymm(cls: ~[x86_64_reg_class]) -> bool {
let len = vec::len(cls);
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return (len > 2u &&
is_sse(cls[0]) &&
cls[1] == sseup_class &&
cls[2] == sseup_class) ||
(len > 3u &&
is_sse(cls[1]) &&
cls[2] == sseup_class &&
cls[3] == sseup_class);
}
fn classify_ty(ty: TypeRef) -> ~[x86_64_reg_class] {
fn align(off: uint, ty: TypeRef) -> uint {
let a = ty_align(ty);
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return (off + a - 1u) / a * a;
}
fn struct_tys(ty: TypeRef) -> ~[TypeRef] {
let n = llvm::LLVMCountStructElementTypes(ty);
let elts = vec::from_elem(n as uint, ptr::null());
do vec::as_imm_buf(elts) |buf, _len| {
llvm::LLVMGetStructElementTypes(ty, buf);
}
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return elts;
}
fn ty_align(ty: TypeRef) -> uint {
return match llvm::LLVMGetTypeKind(ty) {
Integer => {
((llvm::LLVMGetIntTypeWidth(ty) as uint) + 7) / 8
}
Pointer => 8,
Float => 4,
Double => 8,
Struct => {
do vec::foldl(0, struct_tys(ty)) |a, t| {
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uint::max(a, ty_align(*t))
}
}
Array => {
let elt = llvm::LLVMGetElementType(ty);
ty_align(elt)
}
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_ => fail ~"ty_size: unhandled type"
};
}
fn ty_size(ty: TypeRef) -> uint {
return match llvm::LLVMGetTypeKind(ty) {
Integer => {
((llvm::LLVMGetIntTypeWidth(ty) as uint) + 7) / 8
}
Pointer => 8,
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
}
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_ => fail ~"ty_size: unhandled type"
};
}
fn all_mem(cls: ~[mut x86_64_reg_class]) {
for uint::range(0, cls.len()) |i| {
cls[i] = memory_class;
}
}
fn unify(cls: ~[mut x86_64_reg_class],
i: uint,
newv: x86_64_reg_class) {
if cls[i] == newv {
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return;
} else if cls[i] == no_class {
cls[i] = newv;
} else if newv == no_class {
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return;
} else if cls[i] == memory_class || newv == memory_class {
cls[i] = memory_class;
} else if cls[i] == integer_class || newv == integer_class {
cls[i] = integer_class;
} else if cls[i] == x87_class ||
cls[i] == x87up_class ||
cls[i] == complex_x87_class ||
newv == x87_class ||
newv == x87up_class ||
newv == complex_x87_class {
cls[i] = memory_class;
} else {
cls[i] = newv;
}
}
fn classify_struct(tys: ~[TypeRef],
cls: ~[mut x86_64_reg_class], i: uint,
off: uint) {
if vec::is_empty(tys) {
classify(T_i64(), cls, i, off);
} else {
let mut field_off = off;
for vec::each(tys) |ty| {
field_off = align(field_off, *ty);
classify(*ty, cls, i, field_off);
field_off += ty_size(*ty);
}
}
}
fn classify(ty: TypeRef,
cls: ~[mut x86_64_reg_class], ix: uint,
off: uint) {
let t_align = ty_align(ty);
let t_size = ty_size(ty);
let misalign = off % t_align;
if misalign != 0u {
let mut i = off / 8u;
let e = (off + t_size + 7u) / 8u;
while i < e {
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unify(cls, ix + i, memory_class);
i += 1u;
}
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return;
}
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match llvm::LLVMGetTypeKind(ty) as int {
8 /* integer */ |
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12 /* pointer */ => {
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unify(cls, ix + off / 8u, integer_class);
}
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2 /* float */ => {
if off % 8u == 4u {
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unify(cls, ix + off / 8u, sse_fv_class);
} else {
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unify(cls, ix + off / 8u, sse_fs_class);
}
}
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3 /* double */ => {
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unify(cls, ix + off / 8u, sse_ds_class);
}
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10 /* struct */ => {
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classify_struct(struct_tys(ty), cls, ix, off);
}
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11 /* array */ => {
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let elt = llvm::LLVMGetElementType(ty);
let eltsz = ty_size(elt);
let len = llvm::LLVMGetArrayLength(ty) as uint;
let mut i = 0u;
while i < len {
classify(elt, cls, ix, off + i * eltsz);
i += 1u;
}
}
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_ => fail ~"classify: unhandled type"
}
}
fn fixup(ty: TypeRef, cls: ~[mut x86_64_reg_class]) {
let mut i = 0u;
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let llty = llvm::LLVMGetTypeKind(ty) as int;
let e = vec::len(cls);
if vec::len(cls) > 2u &&
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(llty == 10 /* struct */ ||
llty == 11 /* array */) {
if is_sse(cls[i]) {
i += 1u;
while i < e {
if cls[i] != sseup_class {
all_mem(cls);
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return;
}
i += 1u;
}
} else {
all_mem(cls);
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return
}
} else {
while i < e {
if cls[i] == memory_class {
all_mem(cls);
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return;
}
if cls[i] == x87up_class {
// for darwin
// cls[i] = sse_ds_class;
all_mem(cls);
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return;
}
if cls[i] == sseup_class {
cls[i] = sse_int_class;
} else if is_sse(cls[i]) {
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i += 1;
while cls[i] == sseup_class { i += 1u; }
} else if cls[i] == x87_class {
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i += 1;
while cls[i] == x87up_class { i += 1u; }
} else {
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i += 1;
}
}
}
}
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let words = (ty_size(ty) + 7) / 8;
let cls = vec::to_mut(vec::from_elem(words, no_class));
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if words > 4 {
all_mem(cls);
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return vec::from_mut(move cls);
}
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classify(ty, cls, 0, 0);
fixup(ty, cls);
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return vec::from_mut(move cls);
}
fn llreg_ty(cls: ~[x86_64_reg_class]) -> TypeRef {
fn llvec_len(cls: ~[x86_64_reg_class]) -> uint {
let mut len = 1u;
for vec::each(cls) |c| {
if *c != sseup_class {
break;
}
len += 1u;
}
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return len;
}
let mut tys = ~[];
let mut i = 0u;
let e = vec::len(cls);
while i < e {
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match cls[i] {
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integer_class => {
tys.push(T_i64());
}
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sse_fv_class => {
let vec_len = llvec_len(vec::tailn(cls, i + 1u)) * 2u;
let vec_ty = llvm::LLVMVectorType(T_f32(),
vec_len as c_uint);
tys.push(vec_ty);
i += vec_len;
loop;
}
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sse_fs_class => {
tys.push(T_f32());
}
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sse_ds_class => {
tys.push(T_f64());
}
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_ => fail ~"llregtype: unhandled class"
}
i += 1u;
}
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return T_struct(tys);
}
type x86_64_llty = {
cast: bool,
ty: TypeRef
};
type x86_64_tys = {
arg_tys: ~[x86_64_llty],
ret_ty: x86_64_llty,
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attrs: ~[Option<Attribute>],
sret: bool
};
fn x86_64_tys(atys: ~[TypeRef],
rty: TypeRef,
ret_def: bool) -> x86_64_tys {
fn is_reg_ty(ty: TypeRef) -> bool {
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return match llvm::LLVMGetTypeKind(ty) as int {
8 /* integer */ |
12 /* pointer */ |
2 /* float */ |
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3 /* double */ => true,
_ => false
};
}
fn is_pass_byval(cls: ~[x86_64_reg_class]) -> bool {
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return cls[0] == memory_class ||
cls[0] == x87_class ||
cls[0] == complex_x87_class;
}
fn is_ret_bysret(cls: ~[x86_64_reg_class]) -> bool {
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return cls[0] == memory_class;
}
fn x86_64_ty(ty: TypeRef,
is_mem_cls: fn(cls: ~[x86_64_reg_class]) -> bool,
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attr: Attribute) -> (x86_64_llty, Option<Attribute>) {
let mut cast = false;
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let mut ty_attr = option::None;
let mut llty = ty;
if !is_reg_ty(ty) {
let cls = classify_ty(ty);
if is_mem_cls(cls) {
llty = T_ptr(ty);
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ty_attr = option::Some(attr);
} else {
cast = true;
llty = llreg_ty(cls);
}
}
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return ({ cast: cast, ty: llty }, ty_attr);
}
let mut arg_tys = ~[];
let mut attrs = ~[];
for vec::each(atys) |t| {
let (ty, attr) = x86_64_ty(*t, is_pass_byval, ByValAttribute);
arg_tys.push(ty);
attrs.push(attr);
}
let mut (ret_ty, ret_attr) = x86_64_ty(rty, is_ret_bysret,
StructRetAttribute);
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let sret = ret_attr.is_some();
if sret {
arg_tys = vec::append(~[ret_ty], arg_tys);
ret_ty = { cast: false,
ty: T_void()
};
attrs = vec::append(~[ret_attr], attrs);
} else if !ret_def {
ret_ty = { cast: false,
ty: T_void()
};
}
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return {
arg_tys: arg_tys,
ret_ty: ret_ty,
attrs: attrs,
sret: sret
};
}
fn decl_x86_64_fn(tys: x86_64_tys,
decl: fn(fnty: TypeRef) -> ValueRef) -> ValueRef {
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let atys = vec::map(tys.arg_tys, |t| t.ty);
let rty = tys.ret_ty.ty;
let fnty = T_fn(atys, rty);
let llfn = decl(fnty);
for vec::eachi(tys.attrs) |i, a| {
match *a {
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option::Some(attr) => {
let llarg = get_param(llfn, i);
llvm::LLVMAddAttribute(llarg, attr as c_uint);
}
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_ => ()
}
}
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return llfn;
}
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fn link_name(ccx: @crate_ctxt, i: @ast::foreign_item) -> ~str {
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match attr::first_attr_value_str_by_name(i.attrs, ~"link_name") {
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None => ccx.sess.str_of(i.ident),
option::Some(ln) => ln
}
}
type c_stack_tys = {
arg_tys: ~[TypeRef],
ret_ty: TypeRef,
ret_def: bool,
bundle_ty: TypeRef,
shim_fn_ty: TypeRef,
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x86_64_tys: Option<x86_64_tys>
};
fn c_arg_and_ret_lltys(ccx: @crate_ctxt,
id: ast::node_id) -> (~[TypeRef], TypeRef, ty::t) {
match ty::get(ty::node_id_to_type(ccx.tcx, id)).sty {
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ty::ty_fn(ref fn_ty) => {
let llargtys = type_of_explicit_args(ccx, fn_ty.sig.inputs);
let llretty = type_of::type_of(ccx, fn_ty.sig.output);
(llargtys, llretty, fn_ty.sig.output)
}
_ => ccx.sess.bug(~"c_arg_and_ret_lltys called on non-function type")
}
}
fn c_stack_tys(ccx: @crate_ctxt,
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id: ast::node_id) -> @c_stack_tys {
let (llargtys, llretty, ret_ty) = c_arg_and_ret_lltys(ccx, id);
let bundle_ty = T_struct(vec::append_one(llargtys, T_ptr(llretty)));
let ret_def = !ty::type_is_bot(ret_ty) && !ty::type_is_nil(ret_ty);
let x86_64 = if ccx.sess.targ_cfg.arch == arch_x86_64 {
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option::Some(x86_64_tys(llargtys, llretty, ret_def))
} else {
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option::None
};
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return @{
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arg_tys: llargtys,
ret_ty: llretty,
ret_def: ret_def,
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bundle_ty: bundle_ty,
shim_fn_ty: T_fn(~[T_ptr(bundle_ty)], T_void()),
x86_64_tys: x86_64
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};
}
type shim_arg_builder = fn(bcx: block, tys: @c_stack_tys,
llargbundle: ValueRef) -> ~[ValueRef];
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type shim_ret_builder = fn(bcx: block, tys: @c_stack_tys,
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llargbundle: ValueRef, llretval: ValueRef);
fn build_shim_fn_(ccx: @crate_ctxt,
shim_name: ~str,
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llbasefn: ValueRef,
tys: @c_stack_tys,
cc: lib::llvm::CallConv,
arg_builder: shim_arg_builder,
ret_builder: shim_ret_builder) -> ValueRef {
let llshimfn = decl_internal_cdecl_fn(
ccx.llmod, shim_name, tys.shim_fn_ty);
// Declare the body of the shim function:
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let fcx = new_fn_ctxt(ccx, ~[], llshimfn, None);
let bcx = top_scope_block(fcx, None);
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let lltop = bcx.llbb;
let llargbundle = get_param(llshimfn, 0u);
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let llargvals = arg_builder(bcx, tys, llargbundle);
// Create the call itself and store the return value:
let llretval = CallWithConv(bcx, llbasefn,
llargvals, cc); // r
ret_builder(bcx, tys, llargbundle, llretval);
build_return(bcx);
finish_fn(fcx, lltop);
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return llshimfn;
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}
type wrap_arg_builder = fn(bcx: block, tys: @c_stack_tys,
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llwrapfn: ValueRef,
llargbundle: ValueRef);
type wrap_ret_builder = fn(bcx: block, tys: @c_stack_tys,
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llargbundle: ValueRef);
fn build_wrap_fn_(ccx: @crate_ctxt,
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tys: @c_stack_tys,
llshimfn: ValueRef,
llwrapfn: ValueRef,
shim_upcall: ValueRef,
arg_builder: wrap_arg_builder,
ret_builder: wrap_ret_builder) {
let _icx = ccx.insn_ctxt("foreign::build_wrap_fn_");
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let fcx = new_fn_ctxt(ccx, ~[], llwrapfn, None);
let bcx = top_scope_block(fcx, None);
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let lltop = bcx.llbb;
// Allocate the struct and write the arguments into it.
let llargbundle = alloca(bcx, tys.bundle_ty);
arg_builder(bcx, tys, llwrapfn, llargbundle);
// Create call itself.
let llshimfnptr = PointerCast(bcx, llshimfn, T_ptr(T_i8()));
let llrawargbundle = PointerCast(bcx, llargbundle, T_ptr(T_i8()));
Call(bcx, shim_upcall, ~[llrawargbundle, llshimfnptr]);
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ret_builder(bcx, tys, llargbundle);
tie_up_header_blocks(fcx, lltop);
// Make sure our standard return block (that we didn't use) is terminated
let ret_cx = raw_block(fcx, false, fcx.llreturn);
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Unreachable(ret_cx);
}
// For each foreign function F, we generate a wrapper function W and a shim
// function S that all work together. The wrapper function W is the function
// that other rust code actually invokes. Its job is to marshall the
// arguments into a struct. It then uses a small bit of assembly to switch
// over to the C stack and invoke the shim function. The shim function S then
// unpacks the arguments from the struct and invokes the actual function F
// according to its specified calling convention.
//
// Example: Given a foreign c-stack function F(x: X, y: Y) -> Z,
// we generate a wrapper function W that looks like:
//
// void W(Z* dest, void *env, X x, Y y) {
// struct { X x; Y y; Z *z; } args = { x, y, z };
// call_on_c_stack_shim(S, &args);
// }
//
// The shim function S then looks something like:
//
// void S(struct { X x; Y y; Z *z; } *args) {
// *args->z = F(args->x, args->y);
// }
//
// However, if the return type of F is dynamically sized or of aggregate type,
// the shim function looks like:
//
// void S(struct { X x; Y y; Z *z; } *args) {
// F(args->z, args->x, args->y);
// }
//
// Note: on i386, the layout of the args struct is generally the same as the
// desired layout of the arguments on the C stack. Therefore, we could use
// upcall_alloc_c_stack() to allocate the `args` structure and switch the
// stack pointer appropriately to avoid a round of copies. (In fact, the shim
// function itself is unnecessary). We used to do this, in fact, and will
// perhaps do so in the future.
fn trans_foreign_mod(ccx: @crate_ctxt,
foreign_mod: ast::foreign_mod, abi: ast::foreign_abi) {
let _icx = ccx.insn_ctxt("foreign::trans_foreign_mod");
fn build_shim_fn(ccx: @crate_ctxt,
foreign_item: @ast::foreign_item,
tys: @c_stack_tys,
cc: lib::llvm::CallConv) -> ValueRef {
let _icx = ccx.insn_ctxt("foreign::build_shim_fn");
fn build_args(bcx: block, tys: @c_stack_tys,
llargbundle: ValueRef) -> ~[ValueRef] {
let _icx = bcx.insn_ctxt("foreign::shim::build_args");
let mut llargvals = ~[];
let mut i = 0u;
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let n = vec::len(tys.arg_tys);
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match tys.x86_64_tys {
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Some(x86_64) => {
let mut atys = x86_64.arg_tys;
let mut attrs = x86_64.attrs;
if x86_64.sret {
let llretptr = GEPi(bcx, llargbundle, [0u, n]);
let llretloc = Load(bcx, llretptr);
llargvals = ~[llretloc];
atys = vec::tail(atys);
attrs = vec::tail(attrs);
}
while i < n {
let llargval = if atys[i].cast {
let arg_ptr = GEPi(bcx, llargbundle, [0u, i]);
let arg_ptr = BitCast(bcx, arg_ptr,
T_ptr(atys[i].ty));
Load(bcx, arg_ptr)
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} else if attrs[i].is_some() {
GEPi(bcx, llargbundle, [0u, i])
} else {
load_inbounds(bcx, llargbundle, [0u, i])
};
llargvals.push(llargval);
i += 1u;
}
}
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_ => {
while i < n {
let llargval = load_inbounds(bcx, llargbundle,
[0u, i]);
llargvals.push(llargval);
i += 1u;
}
}
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}
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return llargvals;
}
fn build_ret(bcx: block, tys: @c_stack_tys,
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llargbundle: ValueRef, llretval: ValueRef) {
let _icx = bcx.insn_ctxt("foreign::shim::build_ret");
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match tys.x86_64_tys {
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Some(x86_64) => {
for vec::eachi(x86_64.attrs) |i, a| {
match *a {
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Some(attr) => {
llvm::LLVMAddInstrAttribute(
llretval, (i + 1u) as c_uint,
attr as c_uint);
}
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_ => ()
}
}
if x86_64.sret || !tys.ret_def {
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return;
}
let n = vec::len(tys.arg_tys);
let llretptr = GEPi(bcx, llargbundle, [0u, n]);
let llretloc = Load(bcx, llretptr);
if x86_64.ret_ty.cast {
let tmp_ptr = BitCast(bcx, llretloc,
T_ptr(x86_64.ret_ty.ty));
Store(bcx, llretval, tmp_ptr);
} else {
Store(bcx, llretval, llretloc);
};
}
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_ => {
if tys.ret_def {
let n = vec::len(tys.arg_tys);
// R** llretptr = &args->r;
let llretptr = GEPi(bcx, llargbundle, [0u, n]);
// R* llretloc = *llretptr; /* (args->r) */
let llretloc = Load(bcx, llretptr);
// *args->r = r;
Store(bcx, llretval, llretloc);
}
}
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}
}
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let lname = link_name(ccx, foreign_item);
let llbasefn = base_fn(ccx, lname, tys, cc);
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// Name the shim function
let shim_name = lname + ~"__c_stack_shim";
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return build_shim_fn_(ccx, shim_name, llbasefn, tys, cc,
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build_args, build_ret);
}
fn base_fn(ccx: @crate_ctxt, lname: ~str, tys: @c_stack_tys,
cc: lib::llvm::CallConv) -> ValueRef {
// Declare the "prototype" for the base function F:
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match tys.x86_64_tys {
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Some(x86_64) => {
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do decl_x86_64_fn(x86_64) |fnty| {
decl_fn(ccx.llmod, lname, cc, fnty)
}
}
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_ => {
let llbasefnty = T_fn(tys.arg_tys, tys.ret_ty);
decl_fn(ccx.llmod, lname, cc, llbasefnty)
}
}
}
// FIXME (#2535): this is very shaky and probably gets ABIs wrong all
// over the place
fn build_direct_fn(ccx: @crate_ctxt, decl: ValueRef,
item: @ast::foreign_item, tys: @c_stack_tys,
cc: lib::llvm::CallConv) {
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let fcx = new_fn_ctxt(ccx, ~[], decl, None);
let bcx = top_scope_block(fcx, None), lltop = bcx.llbb;
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let llbasefn = base_fn(ccx, link_name(ccx, item), tys, cc);
let ty = ty::lookup_item_type(ccx.tcx,
ast_util::local_def(item.id)).ty;
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let args = vec::from_fn(ty::ty_fn_args(ty).len(), |i| {
get_param(decl, i + first_real_arg)
});
let retval = Call(bcx, llbasefn, args);
if !ty::type_is_nil(ty::ty_fn_ret(ty)) {
Store(bcx, retval, fcx.llretptr);
}
build_return(bcx);
finish_fn(fcx, lltop);
}
fn build_wrap_fn(ccx: @crate_ctxt,
tys: @c_stack_tys,
llshimfn: ValueRef,
llwrapfn: ValueRef) {
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let _icx = ccx.insn_ctxt("foreign::build_wrap_fn");
fn build_args(bcx: block, tys: @c_stack_tys,
llwrapfn: ValueRef, llargbundle: ValueRef) {
let _icx = bcx.insn_ctxt("foreign::wrap::build_args");
let mut i = 0u;
let n = vec::len(tys.arg_tys);
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let implicit_args = first_real_arg; // return + env
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while i < n {
let llargval = get_param(llwrapfn, i + implicit_args);
store_inbounds(bcx, llargval, llargbundle, ~[0u, i]);
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i += 1u;
}
let llretptr = get_param(llwrapfn, 0u);
store_inbounds(bcx, llretptr, llargbundle, ~[0u, n]);
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}
fn build_ret(bcx: block, _tys: @c_stack_tys,
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_llargbundle: ValueRef) {
let _icx = bcx.insn_ctxt("foreign::wrap::build_ret");
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RetVoid(bcx);
}
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build_wrap_fn_(ccx, tys, llshimfn, llwrapfn,
ccx.upcalls.call_shim_on_c_stack,
build_args, build_ret);
}
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let mut cc = match abi {
ast::foreign_abi_rust_intrinsic |
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ast::foreign_abi_cdecl => lib::llvm::CCallConv,
ast::foreign_abi_stdcall => lib::llvm::X86StdcallCallConv
};
for vec::each(foreign_mod.items) |foreign_item| {
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match foreign_item.node {
ast::foreign_item_fn(*) => {
let id = foreign_item.id;
if abi != ast::foreign_abi_rust_intrinsic {
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let llwrapfn = get_item_val(ccx, id);
let tys = c_stack_tys(ccx, id);
if attr::attrs_contains_name(foreign_item.attrs,
~"rust_stack") {
build_direct_fn(ccx, llwrapfn, *foreign_item, tys, cc);
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} else {
let llshimfn = build_shim_fn(ccx, *foreign_item, tys, cc);
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build_wrap_fn(ccx, tys, llshimfn, llwrapfn);
}
} else {
// Intrinsics are emitted by monomorphic fn
}
}
ast::foreign_item_const(*) => {
let ident = ccx.sess.parse_sess.interner.get(foreign_item.ident);
ccx.item_symbols.insert(foreign_item.id, copy *ident);
}
}
}
}
fn trans_intrinsic(ccx: @crate_ctxt, decl: ValueRef, item: @ast::foreign_item,
path: ast_map::path, substs: param_substs,
ref_id: Option<ast::node_id>)
{
debug!("trans_intrinsic(item.ident=%s)", ccx.sess.str_of(item.ident));
let fcx = new_fn_ctxt_w_id(ccx, path, decl, item.id, None,
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Some(substs), Some(item.span));
let mut bcx = top_scope_block(fcx, None), lltop = bcx.llbb;
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match ccx.sess.str_of(item.ident) {
~"atomic_cxchg" => {
let old = AtomicCmpXchg(bcx,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
get_param(decl, first_real_arg + 2u),
SequentiallyConsistent);
Store(bcx, old, fcx.llretptr);
}
~"atomic_cxchg_acq" => {
let old = AtomicCmpXchg(bcx,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
get_param(decl, first_real_arg + 2u),
Acquire);
Store(bcx, old, fcx.llretptr);
}
~"atomic_cxchg_rel" => {
let old = AtomicCmpXchg(bcx,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
get_param(decl, first_real_arg + 2u),
Release);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xchg" => {
let old = AtomicRMW(bcx, Xchg,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
SequentiallyConsistent);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xchg_acq" => {
let old = AtomicRMW(bcx, Xchg,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
Acquire);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xchg_rel" => {
let old = AtomicRMW(bcx, Xchg,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
Release);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xadd" => {
let old = AtomicRMW(bcx, lib::llvm::Add,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
SequentiallyConsistent);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xadd_acq" => {
let old = AtomicRMW(bcx, lib::llvm::Add,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
Acquire);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xadd_rel" => {
let old = AtomicRMW(bcx, lib::llvm::Add,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
Release);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xsub" => {
let old = AtomicRMW(bcx, lib::llvm::Sub,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
SequentiallyConsistent);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xsub_acq" => {
let old = AtomicRMW(bcx, lib::llvm::Sub,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
Acquire);
Store(bcx, old, fcx.llretptr);
}
~"atomic_xsub_rel" => {
let old = AtomicRMW(bcx, lib::llvm::Sub,
get_param(decl, first_real_arg),
get_param(decl, first_real_arg + 1u),
Release);
Store(bcx, old, fcx.llretptr);
}
~"size_of" => {
let tp_ty = substs.tys[0];
let lltp_ty = type_of::type_of(ccx, tp_ty);
Store(bcx, C_uint(ccx, shape::llsize_of_real(ccx, lltp_ty)),
fcx.llretptr);
}
~"move_val" => {
// Create a datum reflecting the value being moved:
//
// - the datum will be by ref if the value is non-immediate;
//
// - the datum has a FromRvalue source because, that way,
// the `move_to()` method does not feel compelled to
// zero out the memory where the datum resides. Zeroing
// is not necessary since, for intrinsics, there is no
// cleanup to concern ourselves with.
let tp_ty = substs.tys[0];
let mode = appropriate_mode(tp_ty);
let src = Datum {val: get_param(decl, first_real_arg + 1u),
ty: tp_ty, mode: mode, source: FromRvalue};
bcx = src.move_to(bcx, DROP_EXISTING,
get_param(decl, first_real_arg));
}
~"move_val_init" => {
// See comments for `"move_val"`.
let tp_ty = substs.tys[0];
let mode = appropriate_mode(tp_ty);
let src = Datum {val: get_param(decl, first_real_arg + 1u),
ty: tp_ty, mode: mode, source: FromRvalue};
bcx = src.move_to(bcx, INIT, get_param(decl, first_real_arg));
}
~"min_align_of" => {
let tp_ty = substs.tys[0];
let lltp_ty = type_of::type_of(ccx, tp_ty);
Store(bcx, C_uint(ccx, shape::llalign_of_min(ccx, lltp_ty)),
fcx.llretptr);
}
~"pref_align_of"=> {
let tp_ty = substs.tys[0];
let lltp_ty = type_of::type_of(ccx, tp_ty);
Store(bcx, C_uint(ccx, shape::llalign_of_pref(ccx, lltp_ty)),
fcx.llretptr);
}
~"get_tydesc" => {
let tp_ty = substs.tys[0];
let static_ti = get_tydesc(ccx, tp_ty);
glue::lazily_emit_all_tydesc_glue(ccx, static_ti);
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// FIXME (#3727): change this to T_ptr(ccx.tydesc_ty) when the
// core::sys copy of the get_tydesc interface dies off.
let td = PointerCast(bcx, static_ti.tydesc, T_ptr(T_nil()));
Store(bcx, td, fcx.llretptr);
}
~"init" => {
let tp_ty = substs.tys[0];
let lltp_ty = type_of::type_of(ccx, tp_ty);
if !ty::type_is_nil(tp_ty) {
Store(bcx, C_null(lltp_ty), fcx.llretptr);
}
}
~"forget" => {}
~"reinterpret_cast" => {
let tp_ty = substs.tys[0];
let lltp_ty = type_of::type_of(ccx, tp_ty);
let llout_ty = type_of::type_of(ccx, substs.tys[1]);
let tp_sz = shape::llsize_of_real(ccx, lltp_ty),
out_sz = shape::llsize_of_real(ccx, llout_ty);
if tp_sz != out_sz {
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let sp = match ccx.tcx.items.get(ref_id.get()) {
ast_map::node_expr(e) => e.span,
_ => fail ~"reinterpret_cast or forget has non-expr arg"
};
ccx.sess.span_fatal(
sp, fmt!("reinterpret_cast called on types \
with different size: %s (%u) to %s (%u)",
ty_to_str(ccx.tcx, tp_ty), tp_sz,
ty_to_str(ccx.tcx, substs.tys[1]), out_sz));
}
if !ty::type_is_nil(substs.tys[1]) {
// NB: Do not use a Load and Store here. This causes
// massive code bloat when reinterpret_cast is used on
// large structural types.
let llretptr = PointerCast(bcx, fcx.llretptr, T_ptr(T_i8()));
let llcast = get_param(decl, first_real_arg);
let llcast = PointerCast(bcx, llcast, T_ptr(T_i8()));
call_memmove(bcx, llretptr, llcast, llsize_of(ccx, lltp_ty));
}
}
~"addr_of" => {
Store(bcx, get_param(decl, first_real_arg), fcx.llretptr);
}
~"needs_drop" => {
let tp_ty = substs.tys[0];
Store(bcx, C_bool(ty::type_needs_drop(ccx.tcx, tp_ty)),
fcx.llretptr);
}
~"visit_tydesc" => {
let td = get_param(decl, first_real_arg);
let visitor = get_param(decl, first_real_arg + 1u);
let td = PointerCast(bcx, td, T_ptr(ccx.tydesc_type));
glue::call_tydesc_glue_full(bcx, visitor, td,
abi::tydesc_field_visit_glue, None);
}
~"frame_address" => {
let frameaddress = ccx.intrinsics.get(~"llvm.frameaddress");
let frameaddress_val = Call(bcx, frameaddress, ~[C_i32(0i32)]);
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let star_u8 = ty::mk_imm_ptr(
bcx.tcx(),
ty::mk_mach_uint(bcx.tcx(), ast::ty_u8));
let fty = ty::mk_fn(bcx.tcx(), FnTyBase {
meta: FnMeta {purity: ast::impure_fn,
proto:
ty::proto_vstore(ty::vstore_slice(
ty::re_bound(ty::br_anon(0)))),
bounds: @~[],
ret_style: ast::return_val},
sig: FnSig {inputs: ~[{mode: ast::expl(ast::by_val),
ty: star_u8}],
output: ty::mk_nil(bcx.tcx())}
});
let datum = Datum {val: get_param(decl, first_real_arg),
mode: ByRef, ty: fty, source: FromLvalue};
bcx = trans_call_inner(
bcx, None, fty, ty::mk_nil(bcx.tcx()),
|bcx| Callee {bcx: bcx, data: Closure(datum)},
ArgVals(~[frameaddress_val]), Ignore, DontAutorefArg);
}
~"morestack_addr" => {
// XXX This is a hack to grab the address of this particular
// native function. There should be a general in-language
// way to do this
let llfty = type_of_fn(bcx.ccx(), ~[], ty::mk_nil(bcx.tcx()));
let morestack_addr = decl_cdecl_fn(
bcx.ccx().llmod, ~"__morestack", llfty);
let morestack_addr = PointerCast(bcx, morestack_addr,
T_ptr(T_nil()));
Store(bcx, morestack_addr, fcx.llretptr);
}
_ => {
// Could we make this an enum rather than a string? does it get
// checked earlier?
ccx.sess.span_bug(item.span, ~"unknown intrinsic");
}
}
build_return(bcx);
finish_fn(fcx, lltop);
}
fn trans_foreign_fn(ccx: @crate_ctxt, path: ast_map::path, decl: ast::fn_decl,
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body: ast::blk, llwrapfn: ValueRef, id: ast::node_id) {
let _icx = ccx.insn_ctxt("foreign::build_foreign_fn");
fn build_rust_fn(ccx: @crate_ctxt, path: ast_map::path,
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decl: ast::fn_decl, body: ast::blk,
id: ast::node_id) -> ValueRef {
let _icx = ccx.insn_ctxt("foreign::foreign::build_rust_fn");
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let t = ty::node_id_to_type(ccx.tcx, id);
let ps = link::mangle_internal_name_by_path(
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ccx, vec::append_one(path, ast_map::path_name(
syntax::parse::token::special_idents::clownshoe_abi
)));
let llty = type_of_fn_from_ty(ccx, t);
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let llfndecl = decl_internal_cdecl_fn(ccx.llmod, ps, llty);
trans_fn(ccx, path, decl, body, llfndecl, no_self, None, id, None);
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return llfndecl;
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}
fn build_shim_fn(ccx: @crate_ctxt, path: ast_map::path,
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llrustfn: ValueRef, tys: @c_stack_tys) -> ValueRef {
let _icx = ccx.insn_ctxt("foreign::foreign::build_shim_fn");
fn build_args(bcx: block, tys: @c_stack_tys,
llargbundle: ValueRef) -> ~[ValueRef] {
let _icx = bcx.insn_ctxt("foreign::extern::shim::build_args");
let mut llargvals = ~[];
let mut i = 0u;
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let n = vec::len(tys.arg_tys);
let llretptr = load_inbounds(bcx, llargbundle, ~[0u, n]);
llargvals.push(llretptr);
let llenvptr = C_null(T_opaque_box_ptr(bcx.ccx()));
llargvals.push(llenvptr);
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while i < n {
let llargval = load_inbounds(bcx, llargbundle, ~[0u, i]);
llargvals.push(llargval);
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i += 1u;
}
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return llargvals;
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}
fn build_ret(_bcx: block, _tys: @c_stack_tys,
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_llargbundle: ValueRef, _llretval: ValueRef) {
// Nop. The return pointer in the Rust ABI function
// is wired directly into the return slot in the shim struct
}
let shim_name = link::mangle_internal_name_by_path(
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ccx, vec::append_one(path, ast_map::path_name(
syntax::parse::token::special_idents::clownshoe_stack_shim
)));
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return build_shim_fn_(ccx, shim_name, llrustfn, tys,
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lib::llvm::CCallConv,
build_args, build_ret);
}
fn build_wrap_fn(ccx: @crate_ctxt, llshimfn: ValueRef,
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llwrapfn: ValueRef, tys: @c_stack_tys) {
let _icx = ccx.insn_ctxt("foreign::foreign::build_wrap_fn");
fn build_args(bcx: block, tys: @c_stack_tys,
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llwrapfn: ValueRef, llargbundle: ValueRef) {
let _icx = bcx.insn_ctxt("foreign::foreign::wrap::build_args");
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match tys.x86_64_tys {
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option::Some(x86_64) => {
let mut atys = x86_64.arg_tys;
let mut attrs = x86_64.attrs;
let mut j = 0u;
let llretptr = if x86_64.sret {
atys = vec::tail(atys);
attrs = vec::tail(attrs);
j = 1u;
get_param(llwrapfn, 0u)
} else if x86_64.ret_ty.cast {
let retptr = alloca(bcx, x86_64.ret_ty.ty);
BitCast(bcx, retptr, T_ptr(tys.ret_ty))
} else {
alloca(bcx, tys.ret_ty)
};
let mut i = 0u;
let n = vec::len(atys);
while i < n {
let mut argval = get_param(llwrapfn, i + j);
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if attrs[i].is_some() {
argval = Load(bcx, argval);
store_inbounds(bcx, argval, llargbundle,
[0u, i]);
} else if atys[i].cast {
let argptr = GEPi(bcx, llargbundle, [0u, i]);
let argptr = BitCast(bcx, argptr,
T_ptr(atys[i].ty));
Store(bcx, argval, argptr);
} else {
store_inbounds(bcx, argval, llargbundle,
[0u, i]);
}
i += 1u;
}
store_inbounds(bcx, llretptr, llargbundle, [0u, n]);
}
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_ => {
let llretptr = alloca(bcx, tys.ret_ty);
let n = vec::len(tys.arg_tys);
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for uint::range(0u, n) |i| {
let llargval = get_param(llwrapfn, i);
store_inbounds(bcx, llargval, llargbundle,
[0u, i]);
};
store_inbounds(bcx, llretptr, llargbundle, [0u, n]);
}
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}
}
fn build_ret(bcx: block, tys: @c_stack_tys,
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llargbundle: ValueRef) {
let _icx = bcx.insn_ctxt("foreign::foreign::wrap::build_ret");
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match tys.x86_64_tys {
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option::Some(x86_64) => {
if x86_64.sret || !tys.ret_def {
RetVoid(bcx);
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return;
}
let n = vec::len(tys.arg_tys);
let llretval = load_inbounds(bcx, llargbundle, ~[0u, n]);
let llretval = if x86_64.ret_ty.cast {
let retptr = BitCast(bcx, llretval,
T_ptr(x86_64.ret_ty.ty));
Load(bcx, retptr)
} else {
Load(bcx, llretval)
};
Ret(bcx, llretval);
}
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_ => {
let n = vec::len(tys.arg_tys);
let llretval = load_inbounds(bcx, llargbundle, ~[0u, n]);
let llretval = Load(bcx, llretval);
Ret(bcx, llretval);
}
}
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}
build_wrap_fn_(ccx, tys, llshimfn, llwrapfn,
ccx.upcalls.call_shim_on_rust_stack,
build_args, build_ret);
}
let tys = c_stack_tys(ccx, id);
// The internal Rust ABI function - runs on the Rust stack
let llrustfn = build_rust_fn(ccx, path, decl, body, id);
// The internal shim function - runs on the Rust stack
let llshimfn = build_shim_fn(ccx, path, llrustfn, tys);
// The foreign C function - runs on the C stack
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build_wrap_fn(ccx, llshimfn, llwrapfn, tys)
}
fn register_foreign_fn(ccx: @crate_ctxt, sp: span,
path: ast_map::path, node_id: ast::node_id)
-> ValueRef {
let _icx = ccx.insn_ctxt("foreign::register_foreign_fn");
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let t = ty::node_id_to_type(ccx.tcx, node_id);
let (llargtys, llretty, ret_ty) = c_arg_and_ret_lltys(ccx, node_id);
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return if ccx.sess.targ_cfg.arch == arch_x86_64 {
let ret_def = !ty::type_is_bot(ret_ty) && !ty::type_is_nil(ret_ty);
let x86_64 = x86_64_tys(llargtys, llretty, ret_def);
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do decl_x86_64_fn(x86_64) |fnty| {
register_fn_fuller(ccx, sp, path, node_id,
t, lib::llvm::CCallConv, fnty)
}
} else {
let llfty = T_fn(llargtys, llretty);
register_fn_fuller(ccx, sp, path, node_id,
t, lib::llvm::CCallConv, llfty)
}
}
fn abi_of_foreign_fn(ccx: @crate_ctxt, i: @ast::foreign_item)
-> ast::foreign_abi {
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match attr::first_attr_value_str_by_name(i.attrs, ~"abi") {
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None => match ccx.tcx.items.get(i.id) {
ast_map::node_foreign_item(_, abi, _) => abi,
// ??
_ => fail ~"abi_of_foreign_fn: not foreign"
},
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Some(_) => match attr::foreign_abi(i.attrs) {
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either::Right(abi) => abi,
either::Left(msg) => ccx.sess.span_fatal(i.span, msg)
}
}
}