Add AbiSet and integrate it into the AST.

I believe this patch incorporates all expected syntax changes from extern
function reform (#3678). You can now write things like:

    extern "<abi>" fn foo(s: S) -> T { ... }
    extern "<abi>" mod { ... }
    extern "<abi>" fn(S) -> T

The ABI for foreign functions is taken from this syntax (rather than from an
annotation).  We support the full ABI specification I described on the mailing
list.  The correct ABI is chosen based on the target architecture.

Calls by pointer to C functions are not yet supported, and the Rust type of
crust fns is still *u8.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/libsyntax/ext/pipes/ast_builder.rs b/src/libsyntax/ext/pipes/ast_builder.rs
index 075474a2a0d..72e6c22dbc8 100644
--- a/src/libsyntax/ext/pipes/ast_builder.rs
+++ b/src/libsyntax/ext/pipes/ast_builder.rs
@@ -15,7 +15,8 @@
 
 use core::prelude::*;
 
-use ast::ident;
+use abi::AbiSet;
+use ast::{ident, node_id};
 use ast;
 use ast_util;
 use codemap::{span, respan, dummy_sp, spanned};
@@ -272,6 +273,7 @@ impl ext_ctxt_ast_builder for @ext_ctxt {
                   dummy_sp(),
                   ast::item_fn(self.fn_decl(inputs, output),
                                ast::impure_fn,
+                               AbiSet::Rust(),
                                generics,
                                body))
     }