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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.
/*
* Inline assembly support.
*/
use ast;
use codemap::span;
use ext::base;
use ext::base::*;
use parse;
use parse::token;
enum State {
Asm,
Outputs,
Inputs,
Clobbers,
Options
}
fn next_state(s: State) -> Option<State> {
match s {
Asm => Some(Outputs),
Outputs => Some(Inputs),
Inputs => Some(Clobbers),
Clobbers => Some(Options),
Options => None
}
}
pub fn expand_asm(cx: @ext_ctxt, sp: span, tts: &[ast::token_tree])
-> base::MacResult {
let p = parse::new_parser_from_tts(cx.parse_sess(),
cx.cfg(),
vec::from_slice(tts));
let mut asm = ~"";
let mut outputs = ~[];
let mut inputs = ~[];
let mut cons = ~"";
let mut volatile = false;
let mut alignstack = false;
let mut dialect = ast::asm_att;
let mut state = Asm;
// Not using labeled break to get us through one round of bootstrapping.
let mut continue = true;
while continue {
match state {
Asm => {
asm = expr_to_str(cx, p.parse_expr(),
~"inline assembly must be a string literal.");
}
Outputs => {
while *p.token != token::EOF &&
*p.token != token::COLON &&
*p.token != token::MOD_SEP {
if outputs.len() != 0 {
p.eat(&token::COMMA);
}
let constraint = p.parse_str();
p.expect(&token::LPAREN);
let out = p.parse_expr();
p.expect(&token::RPAREN);
let out = @ast::expr {
id: cx.next_id(),
callee_id: cx.next_id(),
span: out.span,
node: ast::expr_addr_of(ast::m_mutbl, out)
};
outputs.push((constraint, out));
}
}
Inputs => {
while *p.token != token::EOF &&
*p.token != token::COLON &&
*p.token != token::MOD_SEP {
if inputs.len() != 0 {
p.eat(&token::COMMA);
}
let constraint = p.parse_str();
p.expect(&token::LPAREN);
let in = p.parse_expr();
p.expect(&token::RPAREN);
inputs.push((constraint, in));
}
}
Clobbers => {
let mut clobs = ~[];
while *p.token != token::EOF &&
*p.token != token::COLON &&
*p.token != token::MOD_SEP {
if clobs.len() != 0 {
p.eat(&token::COMMA);
}
let clob = ~"~{" + *p.parse_str() + ~"}";
clobs.push(clob);
}
cons = str::connect(clobs, ",");
}
Options => {
let option = *p.parse_str();
if option == ~"volatile" {
volatile = true;
} else if option == ~"alignstack" {
alignstack = true;
} else if option == ~"intel" {
dialect = ast::asm_intel;
}
if *p.token == token::COMMA {
p.eat(&token::COMMA);
}
}
}
while *p.token == token::COLON ||
*p.token == token::MOD_SEP ||
*p.token == token::EOF {
state = if *p.token == token::COLON {
p.bump();
match next_state(state) {
Some(x) => x,
None => {
continue = false;
break
}
}
} else if *p.token == token::MOD_SEP {
p.bump();
let s = match next_state(state) {
Some(x) => x,
None => {
continue = false;
break
}
};
match next_state(s) {
Some(x) => x,
None => {
continue = false;
break
}
}
} else if *p.token == token::EOF {
continue = false;
break;
} else {
state
};
}
}
MRExpr(@ast::expr {
id: cx.next_id(),
callee_id: cx.next_id(),
node: ast::expr_inline_asm(ast::inline_asm {
asm: @asm,
clobbers: @cons,
inputs: inputs,
outputs: outputs,
volatile: volatile,
alignstack: alignstack,
dialect: dialect
}),
span: sp
})
}
|
