syntax: replace OptVec with plain Vec.

The new vector representation has no allocations when empty, so OptVec
is now useless overhead.

Author: huonw

src/librustc/front/std_inject.rs

@@ -19,7 +19,6 @@ use syntax::codemap::DUMMY_SP;
 use syntax::codemap;
 use syntax::fold::Folder;
 use syntax::fold;
-use syntax::opt_vec;
 use syntax::parse::token::InternedString;
 use syntax::parse::token;
 use syntax::util::small_vector::SmallVector;
@@ -164,13 +163,13 @@ impl fold::Folder for PreludeInjector {
             segments: vec!(
                 ast::PathSegment {
                     identifier: token::str_to_ident("std"),
-                    lifetimes: opt_vec::Empty,
-                    types: opt_vec::Empty,
+                    lifetimes: Vec::new(),
+                    types: Vec::new(),
                 },
                 ast::PathSegment {
                     identifier: token::str_to_ident("prelude"),
-                    lifetimes: opt_vec::Empty,
-                    types: opt_vec::Empty,
+                    lifetimes: Vec::new(),
+                    types: Vec::new(),
                 }),
         };
 

src/librustc/front/test.rs

@@ -30,7 +30,6 @@ use syntax::codemap;
 use syntax::ext::base::ExtCtxt;
 use syntax::fold::Folder;
 use syntax::fold;
-use syntax::opt_vec;
 use syntax::parse::token::InternedString;
 use syntax::parse::token;
 use syntax::print::pprust;
@@ -370,8 +369,8 @@ fn path_node(ids: ~[ast::Ident]) -> ast::Path {
         global: false,
         segments: ids.move_iter().map(|identifier| ast::PathSegment {
             identifier: identifier,
-            lifetimes: opt_vec::Empty,
-            types: opt_vec::Empty,
+            lifetimes: Vec::new(),
+            types: Vec::new(),
         }).collect()
     }
 }
@@ -382,8 +381,8 @@ fn path_node_global(ids: ~[ast::Ident]) -> ast::Path {
         global: true,
         segments: ids.move_iter().map(|identifier| ast::PathSegment {
             identifier: identifier,
-            lifetimes: opt_vec::Empty,
-            types: opt_vec::Empty,
+            lifetimes: Vec::new(),
+            types: Vec::new(),
         }).collect()
     }
 }

src/librustc/metadata/tydecode.rs

@@ -20,11 +20,11 @@ use middle::ty;
 
 use std::str;
 use std::uint;
+use std::vec_ng::Vec;
 use syntax::abi::AbiSet;
 use syntax::abi;
 use syntax::ast;
 use syntax::ast::*;
-use syntax::opt_vec;
 use syntax::parse::token;
 
 // Compact string representation for ty::t values. API ty_str &
@@ -192,7 +192,7 @@ fn parse_region_substs(st: &mut PState, conv: conv_did) -> ty::RegionSubsts {
     match next(st) {
         'e' => ty::ErasedRegions,
         'n' => {
-            let mut regions = opt_vec::Empty;
+            let mut regions = Vec::new();
             while peek(st) != '.' {
                 let r = parse_region(st, |x,y| conv(x,y));
                 regions.push(r);

src/librustc/middle/borrowck/move_data.rs

@@ -17,6 +17,7 @@ comments in the section "Moves and initialization" and in `doc.rs`.
 
 use std::cell::RefCell;
 use std::uint;
+use std::vec_ng::Vec;
 use collections::{HashMap, HashSet};
 use middle::borrowck::*;
 use middle::dataflow::DataFlowContext;
@@ -26,8 +27,6 @@ use middle::typeck;
 use syntax::ast;
 use syntax::ast_util;
 use syntax::codemap::Span;
-use syntax::opt_vec::OptVec;
-use syntax::opt_vec;
 use util::ppaux::Repr;
 
 pub struct MoveData {
@@ -314,15 +313,15 @@ impl MoveData {
 
     fn existing_base_paths(&self,
                            lp: @LoanPath)
-                           -> OptVec<MovePathIndex> {
-        let mut result = opt_vec::Empty;
+                           -> Vec<MovePathIndex> {
+        let mut result = Vec::new();
         self.add_existing_base_paths(lp, &mut result);
         result
     }
 
     fn add_existing_base_paths(&self,
                                lp: @LoanPath,
-                               result: &mut OptVec<MovePathIndex>) {
+                               result: &mut Vec<MovePathIndex>) {
         /*!
          * Adds any existing move path indices for `lp` and any base
          * paths of `lp` to `result`, but does not add new move paths

src/librustc/middle/cfg/construct.rs

@@ -15,7 +15,8 @@ use middle::ty;
 use collections::HashMap;
 use syntax::ast;
 use syntax::ast_util;
-use syntax::opt_vec;
+
+use std::vec_ng::Vec;
 
 struct CFGBuilder {
     tcx: ty::ctxt,
@@ -471,7 +472,7 @@ impl CFGBuilder {
     fn add_contained_edge(&mut self,
                           source: CFGIndex,
                           target: CFGIndex) {
-        let data = CFGEdgeData {exiting_scopes: opt_vec::Empty};
+        let data = CFGEdgeData {exiting_scopes: Vec::new()};
         self.graph.add_edge(source, target, data);
     }
 
@@ -480,7 +481,7 @@ impl CFGBuilder {
                         from_index: CFGIndex,
                         to_loop: LoopScope,
                         to_index: CFGIndex) {
-        let mut data = CFGEdgeData {exiting_scopes: opt_vec::Empty};
+        let mut data = CFGEdgeData {exiting_scopes: Vec::new()};
         let mut scope_id = from_expr.id;
         while scope_id != to_loop.loop_id {
             data.exiting_scopes.push(scope_id);

src/librustc/middle/cfg/mod.rs

@@ -20,7 +20,8 @@ use middle::ty;
 use middle::typeck;
 use collections::HashMap;
 use syntax::ast;
-use syntax::opt_vec::OptVec;
+
+use std::vec_ng::Vec;
 
 mod construct;
 
@@ -36,7 +37,7 @@ pub struct CFGNodeData {
 }
 
 pub struct CFGEdgeData {
-    exiting_scopes: OptVec<ast::NodeId>
+    exiting_scopes: Vec<ast::NodeId>
 }
 
 pub type CFGIndex = graph::NodeIndex;

src/librustc/middle/kind.rs

@@ -19,7 +19,6 @@ use util::ppaux::UserString;
 use syntax::ast::*;
 use syntax::attr;
 use syntax::codemap::Span;
-use syntax::opt_vec;
 use syntax::print::pprust::expr_to_str;
 use syntax::{visit,ast_util};
 use syntax::visit::Visitor;
@@ -50,6 +49,8 @@ use syntax::visit::Visitor;
 // primitives in the stdlib are explicitly annotated to only take sendable
 // types.
 
+use std::vec_ng::Vec;
+
 #[deriving(Clone)]
 pub struct Context {
     tcx: ty::ctxt,
@@ -92,7 +93,7 @@ fn check_struct_safe_for_destructor(cx: &mut Context,
     let struct_tpt = ty::lookup_item_type(cx.tcx, struct_did);
     if !struct_tpt.generics.has_type_params() {
         let struct_ty = ty::mk_struct(cx.tcx, struct_did, ty::substs {
-            regions: ty::NonerasedRegions(opt_vec::Empty),
+            regions: ty::NonerasedRegions(Vec::new()),
             self_ty: None,
             tps: ~[]
         });

src/librustc/middle/privacy.rs

@@ -13,6 +13,7 @@
 //! which are available for use externally when compiled as a library.
 
 use std::mem::replace;
+use std::vec_ng::Vec;
 use collections::{HashSet, HashMap};
 
 use metadata::csearch;
@@ -28,7 +29,6 @@ use syntax::ast_util::{is_local, def_id_of_def, local_def};
 use syntax::attr;
 use syntax::codemap::Span;
 use syntax::parse::token;
-use syntax::opt_vec;
 use syntax::visit;
 use syntax::visit::Visitor;
 
@@ -855,8 +855,8 @@ impl<'a> Visitor<()> for PrivacyVisitor<'a> {
                                 debug!("privacy - list {}", pid.node.id);
                                 let seg = ast::PathSegment {
                                     identifier: pid.node.name,
-                                    lifetimes: opt_vec::Empty,
-                                    types: opt_vec::Empty,
+                                    lifetimes: Vec::new(),
+                                    types: Vec::new(),
                                 };
                                 let segs = vec!(seg);
                                 let path = ast::Path {

src/librustc/middle/resolve.rs

@@ -25,12 +25,12 @@ use syntax::parse::token::special_idents;
 use syntax::parse::token;
 use syntax::print::pprust::path_to_str;
 use syntax::codemap::{Span, DUMMY_SP, Pos};
-use syntax::opt_vec::OptVec;
 use syntax::visit;
 use syntax::visit::Visitor;
 
 use std::cell::{Cell, RefCell};
 use std::uint;
+use std::vec_ng::Vec;
 use std::mem::replace;
 use collections::{HashMap, HashSet};
 
@@ -3966,7 +3966,7 @@ impl Resolver {
     }
 
     fn resolve_type_parameters(&mut self,
-                                   type_parameters: &OptVec<TyParam>) {
+                                   type_parameters: &Vec<TyParam>) {
         for type_parameter in type_parameters.iter() {
             for bound in type_parameter.bounds.iter() {
                 self.resolve_type_parameter_bound(type_parameter.id, bound);

src/librustc/middle/resolve_lifetime.rs

@@ -19,10 +19,11 @@
 
 use driver::session;
 use std::cell::RefCell;
+use std::vec_ng::Vec;
+
 use collections::HashMap;
 use syntax::ast;
 use syntax::codemap::Span;
-use syntax::opt_vec::OptVec;
 use syntax::parse::token::special_idents;
 use syntax::parse::token;
 use syntax::print::pprust::{lifetime_to_str};
@@ -39,8 +40,8 @@ struct LifetimeContext {
 }
 
 enum ScopeChain<'a> {
-    ItemScope(&'a OptVec<ast::Lifetime>),
-    FnScope(ast::NodeId, &'a OptVec<ast::Lifetime>, &'a ScopeChain<'a>),
+    ItemScope(&'a Vec<ast::Lifetime>),
+    FnScope(ast::NodeId, &'a Vec<ast::Lifetime>, &'a ScopeChain<'a>),
     BlockScope(ast::NodeId, &'a ScopeChain<'a>),
     RootScope
 }
@@ -265,7 +266,7 @@ impl LifetimeContext {
                     token::get_name(lifetime_ref.ident)));
     }
 
-    fn check_lifetime_names(&self, lifetimes: &OptVec<ast::Lifetime>) {
+    fn check_lifetime_names(&self, lifetimes: &Vec<ast::Lifetime>) {
         for i in range(0, lifetimes.len()) {
             let lifetime_i = lifetimes.get(i);
 
@@ -311,7 +312,7 @@ impl LifetimeContext {
     }
 }
 
-fn search_lifetimes(lifetimes: &OptVec<ast::Lifetime>,
+fn search_lifetimes(lifetimes: &Vec<ast::Lifetime>,
                     lifetime_ref: &ast::Lifetime)
                     -> Option<(uint, ast::NodeId)> {
     for (i, lifetime_decl) in lifetimes.iter().enumerate() {