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// 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.
// A "shape" is a compact encoding of a type that is used by interpreted glue.
// This substitutes for the runtime tags used by e.g. MLs.
use lib::llvm::llvm;
use lib::llvm::{True, ModuleRef, ValueRef};
use middle::trans::common::*;
use middle::trans;
use core::str;
use core::vec;
pub struct Ctxt {
next_tag_id: u16,
pad: u16,
pad2: u32
}
pub fn mk_global(ccx: @CrateContext,
name: ~str,
llval: ValueRef,
internal: bool)
-> ValueRef {
unsafe {
let llglobal = do str::as_c_str(name) |buf| {
llvm::LLVMAddGlobal(ccx.llmod, val_ty(llval), buf)
};
llvm::LLVMSetInitializer(llglobal, llval);
llvm::LLVMSetGlobalConstant(llglobal, True);
if internal {
::lib::llvm::SetLinkage(llglobal,
::lib::llvm::InternalLinkage);
}
return llglobal;
}
}
pub fn mk_ctxt(llmod: ModuleRef) -> Ctxt {
unsafe {
let llshapetablesty = trans::common::T_named_struct(~"shapes");
let _llshapetables = str::as_c_str(~"shapes", |buf| {
llvm::LLVMAddGlobal(llmod, llshapetablesty, buf)
});
return Ctxt {
next_tag_id: 0u16,
pad: 0u16,
pad2: 0u32
};
}
}
/*
Although these two functions are never called, they are here
for a VERY GOOD REASON. See #3670
*/
pub fn add_u16(dest: &mut ~[u8], val: u16) {
*dest += ~[(val & 0xffu16) as u8, (val >> 8u16) as u8];
}
pub fn add_substr(dest: &mut ~[u8], src: ~[u8]) {
add_u16(&mut *dest, vec::len(src) as u16);
*dest += src;
}
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