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// Copyright 2012-2015 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.
//! # Translation of inline assembly.
use llvm;
use trans::build::*;
use trans::callee;
use trans::common::*;
use trans::cleanup;
use trans::cleanup::CleanupMethods;
use trans::expr;
use trans::type_of;
use trans::type_::Type;
use rustc_front::hir as ast;
use std::ffi::CString;
use syntax::ast::AsmDialect;
use libc::{c_uint, c_char};
// Take an inline assembly expression and splat it out via LLVM
pub fn trans_inline_asm<'blk, 'tcx>(bcx: Block<'blk, 'tcx>, ia: &ast::InlineAsm)
-> Block<'blk, 'tcx> {
let fcx = bcx.fcx;
let mut bcx = bcx;
let mut constraints = Vec::new();
let mut output_types = Vec::new();
let temp_scope = fcx.push_custom_cleanup_scope();
let mut ext_inputs = Vec::new();
let mut ext_constraints = Vec::new();
// Prepare the output operands
let mut outputs = Vec::new();
let mut inputs = Vec::new();
for (i, out) in ia.outputs.iter().enumerate() {
constraints.push(out.constraint.clone());
let out_datum = unpack_datum!(bcx, expr::trans(bcx, &out.expr));
if out.is_indirect {
bcx = callee::trans_arg_datum(bcx,
expr_ty(bcx, &out.expr),
out_datum,
cleanup::CustomScope(temp_scope),
&mut inputs);
if out.is_rw {
ext_inputs.push(*inputs.last().unwrap());
ext_constraints.push(i.to_string());
}
} else {
output_types.push(type_of::type_of(bcx.ccx(), out_datum.ty));
outputs.push(out_datum.val);
if out.is_rw {
bcx = callee::trans_arg_datum(bcx,
expr_ty(bcx, &out.expr),
out_datum,
cleanup::CustomScope(temp_scope),
&mut ext_inputs);
ext_constraints.push(i.to_string());
}
}
}
// Now the input operands
for &(ref c, ref input) in &ia.inputs {
constraints.push((*c).clone());
let in_datum = unpack_datum!(bcx, expr::trans(bcx, &input));
bcx = callee::trans_arg_datum(bcx,
expr_ty(bcx, &input),
in_datum,
cleanup::CustomScope(temp_scope),
&mut inputs);
}
inputs.extend_from_slice(&ext_inputs[..]);
// no failure occurred preparing operands, no need to cleanup
fcx.pop_custom_cleanup_scope(temp_scope);
let clobbers = ia.clobbers.iter()
.map(|s| format!("~{{{}}}", &s));
// Default per-arch clobbers
// Basically what clang does
let arch_clobbers = match &bcx.sess().target.target.arch[..] {
"x86" | "x86_64" => vec!("~{dirflag}", "~{fpsr}", "~{flags}"),
_ => Vec::new()
};
let all_constraints= constraints.iter()
.map(|s| s.to_string())
.chain(ext_constraints)
.chain(clobbers)
.chain(arch_clobbers.iter()
.map(|s| s.to_string()))
.collect::<Vec<String>>()
.join(",");
debug!("Asm Constraints: {}", &all_constraints[..]);
// Depending on how many outputs we have, the return type is different
let num_outputs = outputs.len();
let output_type = match num_outputs {
0 => Type::void(bcx.ccx()),
1 => output_types[0],
_ => Type::struct_(bcx.ccx(), &output_types[..], false)
};
let dialect = match ia.dialect {
AsmDialect::Att => llvm::AD_ATT,
AsmDialect::Intel => llvm::AD_Intel
};
let asm = CString::new(ia.asm.as_bytes()).unwrap();
let constraint_cstr = CString::new(all_constraints).unwrap();
let r = InlineAsmCall(bcx,
asm.as_ptr(),
constraint_cstr.as_ptr(),
&inputs,
output_type,
ia.volatile,
ia.alignstack,
dialect);
// Again, based on how many outputs we have
if num_outputs == 1 {
Store(bcx, r, outputs[0]);
} else {
for (i, o) in outputs.iter().enumerate() {
let v = ExtractValue(bcx, r, i);
Store(bcx, v, *o);
}
}
// Store expn_id in a metadata node so we can map LLVM errors
// back to source locations. See #17552.
unsafe {
let key = "srcloc";
let kind = llvm::LLVMGetMDKindIDInContext(bcx.ccx().llcx(),
key.as_ptr() as *const c_char, key.len() as c_uint);
let val: llvm::ValueRef = C_i32(bcx.ccx(), ia.expn_id.into_u32() as i32);
llvm::LLVMSetMetadata(r, kind,
llvm::LLVMMDNodeInContext(bcx.ccx().llcx(), &val, 1));
}
return bcx;
}
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