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auto merge of #5317 : luqmana/rust/inline-asm, r=graydon
```Rust
#[cfg(target_os = "macos")]
fn helloworld() {
unsafe {
asm!(".pushsection __RODATA, __rodata
msg: .asciz \"Hello World!\"
.popsection
movq msg@GOTPCREL(%rip), %rdi
call _puts");
}
}
#[cfg(target_os = "linux")]
fn helloworld() {
unsafe {
asm!(".pushsection .rodata
msg: .asciz \"Hello World!\"
.popsection
movq msg@GOTPCREL(%rip), %rdi
call puts");
}
}
fn main() {
helloworld();
}
```
```
% rustc foo.rs
% ./foo
Hello World!
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| // 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. | ||
|
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|
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||
|
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| /* | ||
| * Inline assembly support. | ||
| */ | ||
|
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| use core::prelude::*; | ||
|
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| use ast; | ||
| use codemap::span; | ||
| use ext::base; | ||
| use ext::base::*; | ||
| use parse; | ||
| use parse::token; | ||
|
|
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| enum State { | ||
| Asm, | ||
| Outputs, | ||
| Inputs, | ||
| Clobbers, | ||
| Options | ||
| } | ||
|
|
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| fn next_state(s: State) -> Option<State> { | ||
| match s { | ||
| Asm => Some(Outputs), | ||
| Outputs => Some(Inputs), | ||
| Inputs => Some(Clobbers), | ||
| Clobbers => Some(Options), | ||
| Options => None | ||
| } | ||
| } | ||
|
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| pub fn expand_asm(cx: ext_ctxt, sp: span, tts: &[ast::token_tree]) | ||
| -> base::MacResult { | ||
|
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| let p = parse::new_parser_from_tts(cx.parse_sess(), cx.cfg(), | ||
| vec::from_slice(tts)); | ||
|
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| let mut asm = ~""; | ||
| let mut outputs = ~[]; | ||
| let mut inputs = ~[]; | ||
| let mut cons = ~""; | ||
| let mut volatile = false; | ||
| let mut alignstack = false; | ||
|
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| let mut state = Asm; | ||
| loop outer: { | ||
| 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); | ||
| } | ||
|
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| let constraint = p.parse_str(); | ||
| p.expect(&token::LPAREN); | ||
| let out = p.parse_expr(); | ||
| p.expect(&token::RPAREN); | ||
|
|
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| 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); | ||
| } | ||
|
|
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| let constraint = p.parse_str(); | ||
| p.expect(&token::LPAREN); | ||
| let in = p.parse_expr(); | ||
| p.expect(&token::RPAREN); | ||
|
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| inputs.push((constraint, in)); | ||
| } | ||
| } | ||
| Clobbers => { | ||
| let mut clobs = ~[]; | ||
| while *p.token != token::EOF && | ||
| *p.token != token::COLON && | ||
| *p.token != token::MOD_SEP { | ||
|
|
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| if clobs.len() != 0 { | ||
| p.eat(&token::COMMA); | ||
| } | ||
|
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| let clob = ~"~{" + *p.parse_str() + ~"}"; | ||
| clobs.push(clob); | ||
| } | ||
|
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| cons = str::connect(clobs, ","); | ||
| } | ||
| Options => { | ||
| let option = *p.parse_str(); | ||
|
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| if option == ~"volatile" { | ||
| volatile = true; | ||
| } else if option == ~"alignstack" { | ||
| alignstack = true; | ||
| } | ||
|
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| if *p.token == token::COMMA { | ||
| p.eat(&token::COMMA); | ||
| } | ||
| } | ||
| } | ||
|
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| 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 => break outer | ||
| } | ||
| } else if *p.token == token::MOD_SEP { | ||
| p.bump(); | ||
| let s = match next_state(state) { | ||
| Some(x) => x, | ||
| None => break outer | ||
| }; | ||
| match next_state(s) { | ||
| Some(x) => x, | ||
| None => break outer | ||
| } | ||
| } else if *p.token == token::EOF { | ||
| break outer; | ||
| } else { | ||
| state | ||
| }; | ||
| } | ||
| } | ||
|
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| MRExpr(@ast::expr { | ||
| id: cx.next_id(), | ||
| callee_id: cx.next_id(), | ||
| node: ast::expr_inline_asm(@asm, @cons, volatile, alignstack), | ||
| span: sp | ||
| }) | ||
| } | ||
|
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| // | ||
| // Local Variables: | ||
| // mode: rust | ||
| // fill-column: 78; | ||
| // indent-tabs-mode: nil | ||
| // c-basic-offset: 4 | ||
| // buffer-file-coding-system: utf-8-unix | ||
| // End: | ||
| // |
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