syntax: Remove AbiSet, use one Abi

This change removes the AbiSet from the AST, converting all usage to have just
one Abi value. The current scheme selects a relevant ABI given a list of ABIs
based on the target architecture and how relevant each ABI is to that
architecture.

Instead of this mildly complicated scheme, only one ABI will be allowed in abi
strings, and pseudo-abis will be created for special cases as necessary. For
example the "system" abi exists for stdcall on win32 and C on win64.

Closes #10049

Author: alexcrichton

src/librustc/front/config.rs

@@ -90,7 +90,7 @@ fn fold_foreign_mod(cx: &mut Context, nm: &ast::ForeignMod) -> ast::ForeignMod {
         filter_view_item(cx, a).map(|x| cx.fold_view_item(x))
     }).collect();
     ast::ForeignMod {
-        abis: nm.abis,
+        abi: nm.abi,
         view_items: filtered_view_items,
         items: filtered_items
     }

src/librustc/metadata/creader.rs

@@ -187,7 +187,7 @@ fn extract_crate_info(e: &Env, i: &ast::ViewItem) -> Option<CrateInfo> {
 fn visit_item(e: &Env, i: &ast::Item) {
     match i.node {
         ast::ItemForeignMod(ref fm) => {
-            if fm.abis.is_rust() || fm.abis.is_intrinsic() {
+            if fm.abi == abi::Rust || fm.abi == abi::RustIntrinsic {
                 return;
             }
 

src/librustc/metadata/encoder.rs

@@ -33,7 +33,7 @@ use std::hash::Hash;
 use std::io::MemWriter;
 use std::str;
 use collections::HashMap;
-use syntax::abi::AbiSet;
+use syntax::abi;
 use syntax::ast::*;
 use syntax::ast;
 use syntax::ast_map::{PathElem, PathElems};
@@ -1217,7 +1217,7 @@ fn encode_info_for_foreign_item(ecx: &EncodeContext,
                                 nitem: &ForeignItem,
                                 index: @RefCell<Vec<entry<i64>> >,
                                 path: PathElems,
-                                abi: AbiSet) {
+                                abi: abi::Abi) {
     index.borrow_mut().push(entry {
         val: nitem.id as i64,
         pos: ebml_w.writer.tell().unwrap(),
@@ -1231,7 +1231,7 @@ fn encode_info_for_foreign_item(ecx: &EncodeContext,
         encode_bounds_and_type(ebml_w, ecx,
                                &lookup_item_type(ecx.tcx,local_def(nitem.id)));
         encode_name(ebml_w, nitem.ident.name);
-        if abi.is_intrinsic() {
+        if abi == abi::RustIntrinsic {
             (ecx.encode_inlined_item)(ecx, ebml_w, IIForeignRef(nitem));
         } else {
             encode_symbol(ecx, ebml_w, nitem.id);
@@ -1279,11 +1279,11 @@ fn my_visit_foreign_item(ni: &ForeignItem,
     let mut ebml_w = unsafe {
         ebml_w.unsafe_clone()
     };
-    let abis = ecx.tcx.map.get_foreign_abis(ni.id);
+    let abi = ecx.tcx.map.get_foreign_abi(ni.id);
     ecx.tcx.map.with_path(ni.id, |path| {
         encode_info_for_foreign_item(ecx, &mut ebml_w,
                                      ni, index,
-                                     path, abis);
+                                     path, abi);
     });
 }
 

src/librustc/metadata/tydecode.rs

@@ -20,7 +20,6 @@ use middle::ty;
 
 use std::str;
 use std::uint;
-use syntax::abi::AbiSet;
 use syntax::abi;
 use syntax::ast;
 use syntax::ast::*;
@@ -460,18 +459,12 @@ fn parse_purity(c: char) -> Purity {
     }
 }
 
-fn parse_abi_set(st: &mut PState) -> AbiSet {
+fn parse_abi_set(st: &mut PState) -> abi::Abi {
     assert_eq!(next(st), '[');
-    let mut abis = AbiSet::empty();
-    while peek(st) != ']' {
-         scan(st, |c| c == ',', |bytes| {
-                 let abi_str = str::from_utf8(bytes).unwrap().to_owned();
-                 let abi = abi::lookup(abi_str).expect(abi_str);
-                 abis.add(abi);
-              });
-    }
-    assert_eq!(next(st), ']');
-    return abis;
+    scan(st, |c| c == ']', |bytes| {
+        let abi_str = str::from_utf8(bytes).unwrap().to_owned();
+        abi::lookup(abi_str).expect(abi_str)
+    })
 }
 
 fn parse_onceness(c: char) -> ast::Onceness {
@@ -505,7 +498,7 @@ fn parse_bare_fn_ty(st: &mut PState, conv: conv_did) -> ty::BareFnTy {
     let sig = parse_sig(st, |x,y| conv(x,y));
     ty::BareFnTy {
         purity: purity,
-        abis: abi,
+        abi: abi,
         sig: sig
     }
 }

src/librustc/metadata/tyencode.rs

@@ -23,7 +23,7 @@ use std::fmt;
 use middle::ty::param_ty;
 use middle::ty;
 
-use syntax::abi::AbiSet;
+use syntax::abi::Abi;
 use syntax::ast;
 use syntax::ast::*;
 use syntax::diagnostic::SpanHandler;
@@ -341,12 +341,9 @@ fn enc_purity(w: &mut MemWriter, p: Purity) {
     }
 }
 
-fn enc_abi_set(w: &mut MemWriter, abis: AbiSet) {
+fn enc_abi(w: &mut MemWriter, abi: Abi) {
     mywrite!(w, "[");
-    abis.each(|abi| {
-        mywrite!(w, "{},", abi.name());
-        true
-    });
+    mywrite!(w, "{}", abi.name());
     mywrite!(w, "]")
 }
 
@@ -359,7 +356,7 @@ fn enc_onceness(w: &mut MemWriter, o: Onceness) {
 
 pub fn enc_bare_fn_ty(w: &mut MemWriter, cx: &ctxt, ft: &ty::BareFnTy) {
     enc_purity(w, ft.purity);
-    enc_abi_set(w, ft.abis);
+    enc_abi(w, ft.abi);
     enc_fn_sig(w, cx, &ft.sig);
 }
 

src/librustc/middle/lint.rs

@@ -59,6 +59,7 @@ use std::u32;
 use std::u64;
 use std::u8;
 use collections::SmallIntMap;
+use syntax::abi;
 use syntax::ast_map;
 use syntax::ast_util::IdVisitingOperation;
 use syntax::attr::{AttrMetaMethods, AttributeMethods};
@@ -892,7 +893,7 @@ fn check_item_ctypes(cx: &Context, it: &ast::Item) {
     }
 
     match it.node {
-      ast::ItemForeignMod(ref nmod) if !nmod.abis.is_intrinsic() => {
+      ast::ItemForeignMod(ref nmod) if nmod.abi != abi::RustIntrinsic => {
         for ni in nmod.items.iter() {
             match ni.node {
                 ast::ForeignItemFn(decl, _) => check_foreign_fn(cx, decl),

src/librustc/middle/trans/base.rs

@@ -855,8 +855,8 @@ pub fn trans_external_path(ccx: &CrateContext, did: ast::DefId, t: ty::t) -> Val
     let name = csearch::get_symbol(&ccx.sess().cstore, did);
     match ty::get(t).sty {
         ty::ty_bare_fn(ref fn_ty) => {
-            match fn_ty.abis.for_target(ccx.sess().targ_cfg.os,
-                                        ccx.sess().targ_cfg.arch) {
+            match fn_ty.abi.for_target(ccx.sess().targ_cfg.os,
+                                       ccx.sess().targ_cfg.arch) {
                 Some(Rust) | Some(RustIntrinsic) => {
                     get_extern_rust_fn(ccx,
                                        fn_ty.sig.inputs.as_slice(),
@@ -865,7 +865,7 @@ pub fn trans_external_path(ccx: &CrateContext, did: ast::DefId, t: ty::t) -> Val
                                        did)
                 }
                 Some(..) | None => {
-                    let c = foreign::llvm_calling_convention(ccx, fn_ty.abis);
+                    let c = foreign::llvm_calling_convention(ccx, fn_ty.abi);
                     let cconv = c.unwrap_or(lib::llvm::CCallConv);
                     let llty = type_of_fn_from_ty(ccx, t);
                     get_extern_fn(&mut *ccx.externs.borrow_mut(), ccx.llmod,
@@ -1601,7 +1601,7 @@ impl<'a> Visitor<()> for TransItemVisitor<'a> {
 pub fn trans_item(ccx: &CrateContext, item: &ast::Item) {
     let _icx = push_ctxt("trans_item");
     match item.node {
-      ast::ItemFn(decl, purity, _abis, ref generics, body) => {
+      ast::ItemFn(decl, purity, _abi, ref generics, body) => {
         if purity == ast::ExternFn  {
             let llfndecl = get_item_val(ccx, item.id);
             foreign::trans_rust_fn_with_foreign_abi(
@@ -1721,7 +1721,7 @@ fn register_fn(ccx: &CrateContext,
                -> ValueRef {
     let f = match ty::get(node_type).sty {
         ty::ty_bare_fn(ref f) => {
-            assert!(f.abis.is_rust() || f.abis.is_intrinsic());
+            assert!(f.abi == Rust || f.abi == RustIntrinsic);
             f
         }
         _ => fail!("expected bare rust fn or an intrinsic")
@@ -1997,8 +1997,8 @@ pub fn get_item_val(ccx: &CrateContext, id: ast::NodeId) -> ValueRef {
 
             match ni.node {
                 ast::ForeignItemFn(..) => {
-                    let abis = ccx.tcx.map.get_foreign_abis(id);
-                    foreign::register_foreign_item_fn(ccx, abis, ni)
+                    let abi = ccx.tcx.map.get_foreign_abi(id);
+                    foreign::register_foreign_item_fn(ccx, abi, ni)
                 }
                 ast::ForeignItemStatic(..) => {
                     foreign::register_static(ccx, ni)

src/librustc/middle/trans/callee.rs

@@ -50,7 +50,7 @@ use util::ppaux::Repr;
 use middle::trans::type_::Type;
 
 use syntax::ast;
-use syntax::abi::AbiSet;
+use synabi = syntax::abi;
 use syntax::ast_map;
 
 pub struct MethodData {
@@ -363,7 +363,7 @@ pub fn trans_fn_ref_with_vtables(
 
         match map_node {
             ast_map::NodeForeignItem(_) => {
-                tcx.map.get_foreign_abis(def_id.node).is_intrinsic()
+                tcx.map.get_foreign_abi(def_id.node) == synabi::RustIntrinsic
             }
             _ => false
         }
@@ -572,13 +572,11 @@ pub fn trans_call_inner<'a>(
     };
 
     let (abi, ret_ty) = match ty::get(callee_ty).sty {
-        ty::ty_bare_fn(ref f) => (f.abis, f.sig.output),
-        ty::ty_closure(ref f) => (AbiSet::Rust(), f.sig.output),
+        ty::ty_bare_fn(ref f) => (f.abi, f.sig.output),
+        ty::ty_closure(ref f) => (synabi::Rust, f.sig.output),
         _ => fail!("expected bare rust fn or closure in trans_call_inner")
     };
-    let is_rust_fn =
-        abi.is_rust() ||
-        abi.is_intrinsic();
+    let is_rust_fn = abi == synabi::Rust || abi == synabi::RustIntrinsic;
 
     // Generate a location to store the result. If the user does
     // not care about the result, just make a stack slot.

src/librustc/middle/trans/foreign.rs

@@ -27,7 +27,7 @@ use middle::ty::FnSig;
 use middle::ty;
 use std::cmp;
 use std::libc::c_uint;
-use syntax::abi::{Cdecl, Aapcs, C, AbiSet, Win64};
+use syntax::abi::{Cdecl, Aapcs, C, Win64, Abi};
 use syntax::abi::{RustIntrinsic, Rust, Stdcall, Fastcall, System};
 use syntax::codemap::Span;
 use syntax::parse::token::{InternedString, special_idents};
@@ -73,10 +73,10 @@ struct LlvmSignature {
 // Calls to external functions
 
 pub fn llvm_calling_convention(ccx: &CrateContext,
-                               abis: AbiSet) -> Option<CallConv> {
+                               abi: Abi) -> Option<CallConv> {
     let os = ccx.sess().targ_cfg.os;
     let arch = ccx.sess().targ_cfg.arch;
-    abis.for_target(os, arch).map(|abi| {
+    abi.for_target(os, arch).map(|abi| {
         match abi {
             RustIntrinsic => {
                 // Intrinsics are emitted by monomorphic fn
@@ -180,27 +180,27 @@ pub fn register_static(ccx: &CrateContext,
     }
 }
 
-pub fn register_foreign_item_fn(ccx: &CrateContext, abis: AbiSet,
+pub fn register_foreign_item_fn(ccx: &CrateContext, abi: Abi,
                                 foreign_item: &ast::ForeignItem) -> ValueRef {
     /*!
      * Registers a foreign function found in a library.
      * Just adds a LLVM global.
      */
 
-    debug!("register_foreign_item_fn(abis={}, \
+    debug!("register_foreign_item_fn(abi={}, \
             path={}, \
             foreign_item.id={})",
-           abis.repr(ccx.tcx()),
+           abi.repr(ccx.tcx()),
            ccx.tcx.map.path_to_str(foreign_item.id),
            foreign_item.id);
 
-    let cc = match llvm_calling_convention(ccx, abis) {
+    let cc = match llvm_calling_convention(ccx, abi) {
         Some(cc) => cc,
         None => {
             ccx.sess().span_fatal(foreign_item.span,
                 format!("ABI `{}` has no suitable calling convention \
                       for target architecture",
-                      abis.user_string(ccx.tcx())));
+                      abi.user_string(ccx.tcx())));
         }
     };
 
@@ -263,8 +263,8 @@ pub fn trans_native_call<'a>(
            ccx.tn.val_to_str(llfn),
            ccx.tn.val_to_str(llretptr));
 
-    let (fn_abis, fn_sig) = match ty::get(callee_ty).sty {
-        ty::ty_bare_fn(ref fn_ty) => (fn_ty.abis, fn_ty.sig.clone()),
+    let (fn_abi, fn_sig) = match ty::get(callee_ty).sty {
+        ty::ty_bare_fn(ref fn_ty) => (fn_ty.abi, fn_ty.sig.clone()),
         _ => ccx.sess().bug("trans_native_call called on non-function type")
     };
     let llsig = foreign_signature(ccx, &fn_sig, passed_arg_tys.as_slice());
@@ -354,14 +354,14 @@ pub fn trans_native_call<'a>(
         llargs_foreign.push(llarg_foreign);
     }
 
-    let cc = match llvm_calling_convention(ccx, fn_abis) {
+    let cc = match llvm_calling_convention(ccx, fn_abi) {
         Some(cc) => cc,
         None => {
             // FIXME(#8357) We really ought to report a span here
             ccx.sess().fatal(
                 format!("ABI string `{}` has no suitable ABI \
                         for target architecture",
-                        fn_abis.user_string(ccx.tcx())));
+                        fn_abi.user_string(ccx.tcx())));
         }
     };
 
@@ -435,9 +435,9 @@ pub fn trans_foreign_mod(ccx: &CrateContext, foreign_mod: &ast::ForeignMod) {
     for &foreign_item in foreign_mod.items.iter() {
         match foreign_item.node {
             ast::ForeignItemFn(..) => {
-                let abis = foreign_mod.abis;
-                if !(abis.is_rust() || abis.is_intrinsic()) {
-                    register_foreign_item_fn(ccx, abis, foreign_item);
+                match foreign_mod.abi {
+                    Rust | RustIntrinsic => {}
+                    abi => { register_foreign_item_fn(ccx, abi, foreign_item); }
                 }
             }
             _ => {}
@@ -486,7 +486,7 @@ pub fn register_rust_fn_with_foreign_abi(ccx: &CrateContext,
     let t = ty::node_id_to_type(ccx.tcx(), node_id);
     let (cconv, output) = match ty::get(t).sty {
         ty::ty_bare_fn(ref fn_ty) => {
-            let c = llvm_calling_convention(ccx, fn_ty.abis);
+            let c = llvm_calling_convention(ccx, fn_ty.abi);
             (c.unwrap_or(lib::llvm::CCallConv), fn_ty.sig.output)
         }
         _ => fail!("expected bare fn in register_rust_fn_with_foreign_abi")
@@ -534,7 +534,7 @@ pub fn trans_rust_fn_with_foreign_abi(ccx: &CrateContext,
         // normal Rust function. This will be the type of the wrappee fn.
         let f = match ty::get(t).sty {
             ty::ty_bare_fn(ref f) => {
-                assert!(!f.abis.is_rust() && !f.abis.is_intrinsic());
+                assert!(f.abi != Rust && f.abi != RustIntrinsic);
                 f
             }
             _ => {

src/librustc/middle/trans/meth.rs

@@ -34,6 +34,7 @@ use util::common::indenter;
 use util::ppaux::Repr;
 
 use std::c_str::ToCStr;
+use syntax::abi::Rust;
 use syntax::parse::token;
 use syntax::{ast, ast_map, visit};
 
@@ -393,7 +394,7 @@ pub fn trans_trait_callee_from_llval<'a>(bcx: &'a Block<'a>,
     debug!("(translating trait callee) loading method");
     // Replace the self type (&Self or ~Self) with an opaque pointer.
     let llcallee_ty = match ty::get(callee_ty).sty {
-        ty::ty_bare_fn(ref f) if f.abis.is_rust() => {
+        ty::ty_bare_fn(ref f) if f.abi == Rust => {
             type_of_rust_fn(ccx, true, f.sig.inputs.slice_from(1), f.sig.output)
         }
         _ => {

src/librustc/middle/trans/monomorphize.rs

@@ -23,6 +23,7 @@ use middle::ty;
 use middle::typeck;
 use util::ppaux::Repr;
 
+use syntax::abi;
 use syntax::ast;
 use syntax::ast_map;
 use syntax::ast_util::local_def;
@@ -99,7 +100,7 @@ pub fn monomorphic_fn(ccx: &CrateContext,
 
     match map_node {
         ast_map::NodeForeignItem(_) => {
-            if !ccx.tcx.map.get_foreign_abis(fn_id.node).is_intrinsic() {
+            if ccx.tcx.map.get_foreign_abi(fn_id.node) != abi::RustIntrinsic {
                 // Foreign externs don't have to be monomorphized.
                 return (get_item_val(ccx, fn_id.node), true);
             }
@@ -150,7 +151,7 @@ pub fn monomorphic_fn(ccx: &CrateContext,
 
     let f = match ty::get(mono_ty).sty {
         ty::ty_bare_fn(ref f) => {
-            assert!(f.abis.is_rust() || f.abis.is_intrinsic());
+            assert!(f.abi == abi::Rust || f.abi == abi::RustIntrinsic);
             f
         }
         _ => fail!("expected bare rust fn or an intrinsic")