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// Copyright 2017 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 crate::prelude::*;
use crate::rustc::middle::allocator::AllocatorKind;
use crate::rustc_allocator::{ALLOCATOR_METHODS, AllocatorTy};
pub fn codegen(tcx: TyCtxt, module: &mut Module<impl Backend + 'static>, kind: AllocatorKind) {
let usize_ty = module.target_config().pointer_type();
for method in ALLOCATOR_METHODS {
let mut arg_tys = Vec::with_capacity(method.inputs.len());
for ty in method.inputs.iter() {
match *ty {
AllocatorTy::Layout => {
arg_tys.push(usize_ty); // size
arg_tys.push(usize_ty); // align
}
AllocatorTy::Ptr => arg_tys.push(usize_ty),
AllocatorTy::Usize => arg_tys.push(usize_ty),
AllocatorTy::ResultPtr |
AllocatorTy::Unit => panic!("invalid allocator arg"),
}
}
let output = match method.output {
AllocatorTy::ResultPtr => Some(usize_ty),
AllocatorTy::Unit => None,
AllocatorTy::Layout |
AllocatorTy::Usize |
AllocatorTy::Ptr => panic!("invalid allocator output"),
};
let sig = Signature {
call_conv: CallConv::Fast,
params: arg_tys.iter().cloned().map(AbiParam::new).collect(),
returns: output.into_iter().map(AbiParam::new).collect(),
};
let func_id = module
.declare_function(&format!("__rust_{}", method.name), Linkage::Export, &sig)
.unwrap();
let callee_func_id = module
.declare_function(&kind.fn_name(method.name), Linkage::Import, &sig)
.unwrap();
let mut ctx = Context::new();
ctx.func = Function::with_name_signature(ExternalName::user(0, 0), sig.clone());
{
let mut func_ctx = FunctionBuilderContext::new();
let mut bcx: FunctionBuilder = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
let ebb = bcx.create_ebb();
bcx.switch_to_block(ebb);
let args = arg_tys
.into_iter()
.map(|ty| bcx.append_ebb_param(ebb, ty))
.collect::<Vec<Value>>();
let callee_func_ref = module.declare_func_in_func(callee_func_id, &mut bcx.func);
let call_inst = bcx.ins().call(callee_func_ref, &args);
let results = bcx.inst_results(call_inst).to_vec(); // Clone to prevent borrow error
bcx.ins().return_(&results);
bcx.seal_all_blocks();
bcx.finalize();
}
module.define_function(func_id, &mut ctx).unwrap();
}
}
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