140 lines
3.6 KiB
Rust
140 lines
3.6 KiB
Rust
// Copyright 2012-2013 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 std::c_str::ToCStr;
|
|
|
|
use lib;
|
|
use middle::trans::build::*;
|
|
use middle::trans::callee;
|
|
use middle::trans::common::*;
|
|
use middle::trans::expr::*;
|
|
use middle::trans::type_of::*;
|
|
use middle::ty;
|
|
|
|
use middle::trans::type_::Type;
|
|
|
|
use syntax::ast;
|
|
|
|
// Take an inline assembly expression and splat it out via LLVM
|
|
pub fn trans_inline_asm(bcx: @mut Block, ia: &ast::inline_asm) -> @mut Block {
|
|
|
|
let mut bcx = bcx;
|
|
let mut constraints = ~[];
|
|
let mut cleanups = ~[];
|
|
let mut output_types = ~[];
|
|
|
|
// Prepare the output operands
|
|
let outputs = do ia.outputs.map |&(c, out)| {
|
|
constraints.push(c);
|
|
|
|
let out_datum = unpack_datum!(bcx, trans_to_datum(bcx, out));
|
|
output_types.push(type_of(bcx.ccx(), out_datum.ty));
|
|
out_datum.val
|
|
|
|
};
|
|
|
|
for c in cleanups.iter() {
|
|
revoke_clean(bcx, *c);
|
|
}
|
|
cleanups.clear();
|
|
|
|
// Now the input operands
|
|
let inputs = do ia.inputs.map |&(c, input)| {
|
|
constraints.push(c);
|
|
|
|
unpack_result!(bcx, {
|
|
callee::trans_arg_expr(bcx,
|
|
expr_ty(bcx, input),
|
|
ty::ByCopy,
|
|
input,
|
|
&mut cleanups,
|
|
callee::DontAutorefArg)
|
|
})
|
|
|
|
};
|
|
|
|
for c in cleanups.iter() {
|
|
revoke_clean(bcx, *c);
|
|
}
|
|
|
|
let mut constraints = constraints.connect(",");
|
|
|
|
let mut clobbers = getClobbers();
|
|
if !ia.clobbers.is_empty() && !clobbers.is_empty() {
|
|
clobbers = format!("{},{}", ia.clobbers, clobbers);
|
|
} else {
|
|
clobbers.push_str(ia.clobbers);
|
|
}
|
|
|
|
// Add the clobbers to our constraints list
|
|
if clobbers.len() != 0 && constraints.len() != 0 {
|
|
constraints.push_char(',');
|
|
constraints.push_str(clobbers);
|
|
} else {
|
|
constraints.push_str(clobbers);
|
|
}
|
|
|
|
debug!("Asm Constraints: {:?}", constraints);
|
|
|
|
let numOutputs = outputs.len();
|
|
|
|
// Depending on how many outputs we have, the return type is different
|
|
let output_type = if numOutputs == 0 {
|
|
Type::void()
|
|
} else if numOutputs == 1 {
|
|
output_types[0]
|
|
} else {
|
|
Type::struct_(output_types, false)
|
|
};
|
|
|
|
let dialect = match ia.dialect {
|
|
ast::asm_att => lib::llvm::AD_ATT,
|
|
ast::asm_intel => lib::llvm::AD_Intel
|
|
};
|
|
|
|
let r = do ia.asm.with_c_str |a| {
|
|
do constraints.with_c_str |c| {
|
|
InlineAsmCall(bcx, a, c, inputs, output_type, ia.volatile, ia.alignstack, dialect)
|
|
}
|
|
};
|
|
|
|
// Again, based on how many outputs we have
|
|
if numOutputs == 1 {
|
|
Store(bcx, r, outputs[0]);
|
|
} else {
|
|
for (i, o) in outputs.iter().enumerate() {
|
|
let v = ExtractValue(bcx, r, i);
|
|
Store(bcx, v, *o);
|
|
}
|
|
}
|
|
|
|
return bcx;
|
|
|
|
}
|
|
|
|
// Default per-arch clobbers
|
|
// Basically what clang does
|
|
|
|
#[cfg(target_arch = "arm")]
|
|
#[cfg(target_arch = "mips")]
|
|
fn getClobbers() -> ~str {
|
|
~""
|
|
}
|
|
|
|
#[cfg(target_arch = "x86")]
|
|
#[cfg(target_arch = "x86_64")]
|
|
fn getClobbers() -> ~str {
|
|
~"~{dirflag},~{fpsr},~{flags}"
|
|
}
|