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rustc: Add support for calling LLVM intrinsics as native functions

This commit is contained in:
Patrick Walton 2011-03-28 08:24:11 -07:00
parent 6ecdc04788
commit 81695a19f8
5 changed files with 41 additions and 10 deletions
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1
src/comp/front/ast.rs
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@ -346,6 +346,7 @@ type _mod = rec(vec[@view_item] view_items,
tag native_abi {
native_abi_rust;
native_abi_cdecl;
native_abi_llvm;
}
type native_mod = rec(str native_name,

1
src/comp/front/creader.rs
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@ -162,6 +162,7 @@ impure fn parse_sty(@pstate st, str_def sd) -> ty.sty {
alt (next(st) as char) {
case ('r') {abi = ast.native_abi_rust;}
case ('c') {abi = ast.native_abi_cdecl;}
case ('l') {abi = ast.native_abi_llvm;}
}
auto func = parse_ty_fn(st, sd);
ret ty.ty_native_fn(abi,func._0,func._1);

2
src/comp/front/parser.rs
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@ -1964,6 +1964,8 @@ impure fn parse_item_native_mod(parser p) -> @ast.item {
if (_str.eq(t, "cdecl")) {
} else if (_str.eq(t, "rust")) {
abi = ast.native_abi_rust;
} else if (_str.eq(t, "llvm")) {
abi = ast.native_abi_llvm;
} else {
p.err("unsupported abi: " + t);
fail;

1
src/comp/middle/metadata.rs
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@ -108,6 +108,7 @@ fn sty_str(ty.sty st, def_str ds) -> str {
alt (abi) {
case (ast.native_abi_rust) {abistr = "r";}
case (ast.native_abi_cdecl) {abistr = "c";}
case (ast.native_abi_llvm) {abistr = "l";}
}
ret "N" + abistr + ty_fn_str(args, out, ds);
}

46
src/comp/middle/trans.rs
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@ -5884,18 +5884,44 @@ fn decl_native_fn_and_pair(@crate_ctxt cx,
case (ast.native_abi_cdecl) {
pass_task = false;
}
}
auto args = ty.ty_fn_args(fn_type);
for (ty.arg arg in args) {
auto llarg = llvm.LLVMGetParam(fcx.llfn, arg_n);
check (llarg as int != 0);
call_args += vec(bcx.build.PointerCast(llarg, T_i32()));
arg_n += 1u;
case (ast.native_abi_llvm) {
pass_task = false;
// We handle this case below.
}
}
auto r;
auto rptr;
auto args = ty.ty_fn_args(fn_type);
if (abi == ast.native_abi_llvm) {
let vec[ValueRef] call_args = vec();
let vec[TypeRef] call_arg_tys = vec();
auto i = 0u;
while (i < _vec.len[ty.arg](args)) {
auto call_arg = llvm.LLVMGetParam(fcx.llfn, i + 3u);
call_args += vec(call_arg);
call_arg_tys += vec(val_ty(call_arg));
i += 1u;
}
auto llnativefnty = T_fn(call_arg_tys,
type_of(cx, ty.ty_fn_ret(fn_type)));
auto llnativefn = get_extern_fn(cx.externs, cx.llmod, name,
lib.llvm.LLVMCCallConv, llnativefnty);
r = bcx.build.Call(llnativefn, call_args);
rptr = fcx.llretptr;
} else {
for (ty.arg arg in args) {
auto llarg = llvm.LLVMGetParam(fcx.llfn, arg_n);
check (llarg as int != 0);
call_args += vec(bcx.build.PointerCast(llarg, T_i32()));
arg_n += 1u;
}
r = trans_native(bcx.build, cx.glues, lltaskptr, cx.externs,
cx.tn, cx.llmod, name, pass_task, call_args);
rptr = bcx.build.BitCast(fcx.llretptr, T_ptr(T_i32()));
}
auto r = trans_native(bcx.build, cx.glues, lltaskptr, cx.externs, cx.tn,
cx.llmod, name, pass_task, call_args);
auto rptr = bcx.build.BitCast(fcx.llretptr, T_ptr(T_i32()));
bcx.build.Store(r, rptr);
bcx.build.RetVoid();
}