9ac175c503
Avoid allocating extra copies of strings by using "" instead of ~"" for the debug options list and for the `time` function. This is a small change, but it is in a path that's always executed.
128 lines
3.3 KiB
Rust
128 lines
3.3 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use syntax::ast;
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use syntax::codemap::{Span};
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use syntax::visit;
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use syntax::visit::Visitor;
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use std::hashmap::HashSet;
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use extra;
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pub fn time<T, U>(do_it: bool, what: &str, u: U, f: &fn(U) -> T) -> T {
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if !do_it { return f(u); }
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let start = extra::time::precise_time_s();
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let rv = f(u);
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let end = extra::time::precise_time_s();
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println!("time: {:3.3f} s\t{}", end - start, what);
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rv
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}
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pub fn indent<R>(op: &fn() -> R) -> R {
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// Use in conjunction with the log post-processor like `src/etc/indenter`
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// to make debug output more readable.
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debug2!(">>");
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let r = op();
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debug2!("<< (Result = {:?})", r);
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r
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}
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pub struct _indenter {
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_i: (),
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}
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impl Drop for _indenter {
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fn drop(&mut self) { debug2!("<<"); }
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}
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pub fn _indenter(_i: ()) -> _indenter {
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_indenter {
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_i: ()
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}
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}
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pub fn indenter() -> _indenter {
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debug2!(">>");
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_indenter(())
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}
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pub fn field_expr(f: ast::Field) -> @ast::Expr { return f.expr; }
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pub fn field_exprs(fields: ~[ast::Field]) -> ~[@ast::Expr] {
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fields.map(|f| f.expr)
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}
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struct LoopQueryVisitor<'self> {
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p: &'self fn(&ast::Expr_) -> bool,
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flag: bool,
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}
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impl<'self> Visitor<()> for LoopQueryVisitor<'self> {
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fn visit_expr(&mut self, e: @ast::Expr, _: ()) {
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self.flag |= (self.p)(&e.node);
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match e.node {
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// Skip inner loops, since a break in the inner loop isn't a
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// break inside the outer loop
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ast::ExprLoop(*) | ast::ExprWhile(*) => {}
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_ => visit::walk_expr(self, e, ())
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}
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}
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}
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// Takes a predicate p, returns true iff p is true for any subexpressions
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// of b -- skipping any inner loops (loop, while, loop_body)
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pub fn loop_query(b: &ast::Block, p: &fn(&ast::Expr_) -> bool) -> bool {
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let mut v = LoopQueryVisitor {
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p: p,
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flag: false,
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};
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visit::walk_block(&mut v, b, ());
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return v.flag;
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}
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struct BlockQueryVisitor<'self> {
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p: &'self fn(@ast::Expr) -> bool,
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flag: bool,
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}
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impl<'self> Visitor<()> for BlockQueryVisitor<'self> {
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fn visit_expr(&mut self, e: @ast::Expr, _:()) {
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self.flag |= (self.p)(e);
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visit::walk_expr(self, e, ())
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}
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}
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// Takes a predicate p, returns true iff p is true for any subexpressions
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// of b -- skipping any inner loops (loop, while, loop_body)
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pub fn block_query(b: &ast::Block, p: &fn(@ast::Expr) -> bool) -> bool {
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let mut v = BlockQueryVisitor {
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p: p,
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flag: false,
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};
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visit::walk_block(&mut v, b, ());
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return v.flag;
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}
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pub fn local_rhs_span(l: @ast::Local, def: Span) -> Span {
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match l.init {
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Some(i) => return i.span,
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_ => return def
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}
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}
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pub fn pluralize(n: uint, s: ~str) -> ~str {
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if n == 1 { s }
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else { format!("{}s", s) }
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}
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// A set of node IDs (used to keep track of which node IDs are for statements)
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pub type stmt_set = @mut HashSet<ast::NodeId>;
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