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|
// 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.
/*
* 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: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
-> base::MacResult {
let mut p = parse::new_parser_from_tts(cx.parse_sess(),
cx.cfg(),
tts.to_owned());
let mut asm = @"";
let mut asm_str_style = None;
let mut outputs = ~[];
let mut inputs = ~[];
let mut cons = ~"";
let mut volatile = false;
let mut alignstack = false;
let mut dialect = ast::AsmAtt;
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 => {
let (s, style) =
expr_to_str(cx, p.parse_expr(),
"inline assembly must be a string literal.");
asm = s;
asm_str_style = Some(style);
}
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, _str_style) = p.parse_str();
if constraint.starts_with("+") {
cx.span_unimpl(p.last_span,
"'+' (read+write) output operand constraint modifier");
} else if !constraint.starts_with("=") {
cx.span_err(p.last_span, "output operand constraint lacks '='");
}
p.expect(&token::LPAREN);
let out = p.parse_expr();
p.expect(&token::RPAREN);
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, _str_style) = p.parse_str();
if constraint.starts_with("=") {
cx.span_err(p.last_span, "input operand constraint contains '='");
} else if constraint.starts_with("+") {
cx.span_err(p.last_span, "input operand constraint contains '+'");
}
p.expect(&token::LPAREN);
let input = p.parse_expr();
p.expect(&token::RPAREN);
inputs.push((constraint, input));
}
}
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 (s, _str_style) = p.parse_str();
let clob = format!("~\\{{}\\}", s);
clobs.push(clob);
}
cons = clobs.connect(",");
}
Options => {
let (option, _str_style) = p.parse_str();
if "volatile" == option {
volatile = true;
} else if "alignstack" == option {
alignstack = true;
} else if "intel" == option {
dialect = ast::AsmIntel;
}
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: ast::DUMMY_NODE_ID,
node: ast::ExprInlineAsm(ast::InlineAsm {
asm: asm,
asm_str_style: asm_str_style.unwrap(),
clobbers: cons.to_managed(),
inputs: inputs,
outputs: outputs,
volatile: volatile,
alignstack: alignstack,
dialect: dialect
}),
span: sp
})
}
|
