diff options
Diffstat (limited to 'src/libsyntax_ext')
| -rw-r--r-- | src/libsyntax_ext/global_asm.rs | 66 | ||||
| -rw-r--r-- | src/libsyntax_ext/lib.rs | 2 |
2 files changed, 68 insertions, 0 deletions
diff --git a/src/libsyntax_ext/global_asm.rs b/src/libsyntax_ext/global_asm.rs new file mode 100644 index 00000000000..d322d138f04 --- /dev/null +++ b/src/libsyntax_ext/global_asm.rs @@ -0,0 +1,66 @@ +// 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. + +/// Module-level assembly support. +/// +/// The macro defined here allows you to specify "top-level", +/// "file-scoped", or "module-level" assembly. These synonyms +/// all correspond to LLVM's module-level inline assembly instruction. +/// +/// For example, `global_asm!("some assembly here")` translates to +/// LLVM's `module asm "some assembly here"`. All of LLVM's caveats +/// therefore apply. + +use syntax::ast; +use syntax::ext::base; +use syntax::ext::base::*; +use syntax::codemap; +use syntax::feature_gate; +use syntax::ptr::P; +use syntax::symbol::Symbol; +use syntax_pos::Span; +use syntax::tokenstream; + +use syntax::util::small_vector::SmallVector; + +pub const MACRO: &'static str = "global_asm"; + +pub fn expand_global_asm<'cx>(cx: &'cx mut ExtCtxt, + sp: Span, + tts: &[tokenstream::TokenTree]) -> Box<base::MacResult + 'cx> { + if !cx.ecfg.enable_global_asm() { + feature_gate::emit_feature_err(&cx.parse_sess, + MACRO, + sp, + feature_gate::GateIssue::Language, + feature_gate::EXPLAIN_GLOBAL_ASM); + return DummyResult::any(sp); + } + + let mut p = cx.new_parser_from_tts(tts); + let (asm, _) = match expr_to_string(cx, + panictry!(p.parse_expr()), + "inline assembly must be a string literal") { + Some((s, st)) => (s, st), + None => return DummyResult::any(sp), + }; + + MacEager::items(SmallVector::one(P(ast::Item { + ident: ast::Ident::with_empty_ctxt(Symbol::intern("")), + attrs: Vec::new(), + id: ast::DUMMY_NODE_ID, + node: ast::ItemKind::GlobalAsm(P(ast::GlobalAsm { + asm: asm, + ctxt: cx.backtrace(), + })), + vis: ast::Visibility::Inherited, + span: sp, + }))) +} diff --git a/src/libsyntax_ext/lib.rs b/src/libsyntax_ext/lib.rs index 1e9b112b6df..e35e79df585 100644 --- a/src/libsyntax_ext/lib.rs +++ b/src/libsyntax_ext/lib.rs @@ -38,6 +38,7 @@ mod concat_idents; mod env; mod format; mod format_foreign; +mod global_asm; mod log_syntax; mod trace_macros; @@ -99,6 +100,7 @@ pub fn register_builtins(resolver: &mut syntax::ext::base::Resolver, module_path: expand_mod, asm: asm::expand_asm, + global_asm: global_asm::expand_global_asm, cfg: cfg::expand_cfg, concat: concat::expand_syntax_ext, concat_idents: concat_idents::expand_syntax_ext, |