435 lines
16 KiB
Rust
435 lines
16 KiB
Rust
// Copyright 2012-2013 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 std::cast;
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use std::hashmap::HashMap;
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use std::local_data;
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use std::sys;
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use syntax::ast;
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use syntax::parse::token;
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use syntax::print::pprust;
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use rustc::middle::ty;
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use rustc::util::ppaux;
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use utils::*;
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/// This structure keeps track of the state of the world for the code being
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/// executed in rusti.
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struct Program {
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/// All known local variables
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local_vars: HashMap<~str, LocalVariable>,
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/// New variables which will be present (learned from typechecking)
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newvars: HashMap<~str, LocalVariable>,
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/// All known view items (use statements), distinct because these must
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/// follow extern mods
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view_items: ~str,
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/// All known 'extern mod' statements (must always come first)
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externs: ~str,
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/// All known structs defined. These need to have
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/// #[deriving(Encodable,Decodable)] to be at all useful in rusti
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structs: HashMap<~str, ~str>,
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/// All other items, can all be intermingled. Duplicate definitions of the
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/// same name have the previous one overwritten.
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items: HashMap<~str, ~str>,
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}
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/// Represents a local variable that the program is currently using.
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struct LocalVariable {
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/// Should this variable be locally declared as mutable?
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mutable: bool,
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/// This is the type of the serialized data below
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ty: ~str,
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/// This is the serialized version of the variable
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data: ~[u8],
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/// When taking borrowed pointers or slices, care must be taken to ensure
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/// that the deserialization produces what we'd expect. If some magic is in
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/// order, the first element of this pair is the actual type of the local
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/// variable (which can be different from the deserialized type), and the
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/// second element are the '&'s which need to be prepended.
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alterations: Option<(~str, ~str)>,
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}
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type LocalCache = @mut HashMap<~str, @~[u8]>;
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fn tls_key(_k: @LocalCache) {}
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impl Program {
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pub fn new() -> Program {
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Program {
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local_vars: HashMap::new(),
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newvars: HashMap::new(),
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view_items: ~"",
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externs: ~"",
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structs: HashMap::new(),
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items: HashMap::new(),
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}
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}
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/// Clears all local bindings about variables, items, externs, etc.
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pub fn clear(&mut self) {
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*self = Program::new();
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}
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/// Creates a block of code to be fed to rustc. This code is not meant to
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/// run, but rather it is meant to learn about the input given. This will
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/// assert that the types of all bound local variables are encodable,
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/// along with checking syntax and other rust-related things. The reason
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/// that we only check for encodability is that some super-common types
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/// (like &'static str) are not decodable, but are encodable. By doing some
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/// mild approximation when decoding, we can emulate at least &str and &[T].
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///
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/// Once this code has been fed to rustc, it is intended that the code()
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/// function is used to actually generate code to fully compile and run.
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pub fn test_code(&self, user_input: &str, to_print: &Option<~str>,
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new_locals: &[(~str, bool)]) -> ~str {
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let mut code = self.program_header();
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code.push_str("
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fn assert_encodable<T: Encodable<::extra::ebml::writer::Encoder>>(t: &T) {}
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");
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code.push_str("fn main() {\n");
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// It's easy to initialize things if we don't run things...
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for self.local_vars.each |name, var| {
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let mt = var.mt();
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code.push_str(fmt!("let%s %s: %s = fail!();\n", mt, *name, var.ty));
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var.alter(*name, &mut code);
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}
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code.push_str("{\n");
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code.push_str(user_input);
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code.push_char('\n');
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match *to_print {
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Some(ref s) => {
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code.push_str(*s);
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code.push_char('\n');
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}
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None => {}
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}
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for new_locals.each |p| {
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code.push_str(fmt!("assert_encodable(&%s);\n", *p.first_ref()));
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}
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code.push_str("};}");
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return code;
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}
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/// Creates a program to be fed into rustc. This program is structured to
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/// deserialize all bindings into local variables, run the code input, and
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/// then reserialize all the variables back out.
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///
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/// This program (unlike test_code) is meant to run to actually execute the
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/// user's input
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pub fn code(&mut self, user_input: &str, to_print: &Option<~str>) -> ~str {
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let mut code = self.program_header();
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code.push_str("
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fn main() {
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");
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let key: sys::Closure = unsafe {
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let tls_key: &'static fn(@LocalCache) = tls_key;
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cast::transmute(tls_key)
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};
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// First, get a handle to the tls map which stores all the local
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// variables. This works by totally legitimately using the 'code'
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// pointer of the 'tls_key' function as a uint, and then casting it back
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// up to a function
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code.push_str(fmt!("
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let __tls_map: @mut ::std::hashmap::HashMap<~str, @~[u8]> = unsafe {
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let key = ::std::sys::Closure{ code: %? as *(),
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env: ::std::ptr::null() };
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let key = ::std::cast::transmute(key);
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*::std::local_data::local_data_get(key).unwrap()
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};\n", key.code as uint));
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// Using this __tls_map handle, deserialize each variable binding that
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// we know about
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for self.local_vars.each |name, var| {
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let mt = var.mt();
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code.push_str(fmt!("let%s %s: %s = {
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let data = __tls_map.get_copy(&~\"%s\");
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let doc = ::extra::ebml::reader::Doc(data);
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let mut decoder = ::extra::ebml::reader::Decoder(doc);
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::extra::serialize::Decodable::decode(&mut decoder)
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};\n", mt, *name, var.ty, *name));
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var.alter(*name, &mut code);
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}
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// After all that, actually run the user's code.
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code.push_str(user_input);
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code.push_char('\n');
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match *to_print {
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Some(ref s) => { code.push_str(fmt!("pp({\n%s\n});", *s)); }
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None => {}
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}
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do self.newvars.consume |name, var| {
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self.local_vars.insert(name, var);
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}
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// After the input code is run, we can re-serialize everything back out
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// into tls map (to be read later on by this task)
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for self.local_vars.each |name, var| {
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code.push_str(fmt!("{
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let local: %s = %s;
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let bytes = do ::std::io::with_bytes_writer |io| {
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let mut enc = ::extra::ebml::writer::Encoder(io);
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local.encode(&mut enc);
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};
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__tls_map.insert(~\"%s\", @bytes);
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}\n", var.real_ty(), *name, *name));
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}
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// Close things up, and we're done.
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code.push_str("}");
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return code;
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}
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/// Creates the header of the programs which are generated to send to rustc
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fn program_header(&self) -> ~str {
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// up front, disable lots of annoying lints, then include all global
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// state such as items, view items, and extern mods.
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let mut code = fmt!("
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#[allow(ctypes)];
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#[allow(heap_memory)];
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#[allow(implicit_copies)];
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#[allow(managed_heap_memory)];
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#[allow(non_camel_case_types)];
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#[allow(owned_heap_memory)];
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#[allow(path_statement)];
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#[allow(unrecognized_lint)];
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#[allow(unused_imports)];
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#[allow(while_true)];
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#[allow(unused_variable)];
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#[allow(dead_assignment)];
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#[allow(unused_unsafe)];
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#[allow(unused_mut)];
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#[allow(unreachable_code)];
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extern mod extra;
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%s // extern mods
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use extra::serialize::*;
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%s // view items
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", self.externs, self.view_items);
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for self.structs.each_value |s| {
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// The structs aren't really useful unless they're encodable
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code.push_str("#[deriving(Encodable, Decodable)]");
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code.push_str(*s);
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code.push_str("\n");
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}
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for self.items.each_value |s| {
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code.push_str(*s);
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code.push_str("\n");
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}
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code.push_str("fn pp<T>(t: T) { println(fmt!(\"%?\", t)); }\n");
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return code;
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}
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/// Initializes the task-local cache of all local variables known to the
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/// program. This will be used to read local variables out of once the
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/// program starts
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pub fn set_cache(&self) {
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let map = @mut HashMap::new();
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for self.local_vars.each |name, value| {
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map.insert(copy *name, @copy value.data);
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}
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unsafe {
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local_data::local_data_set(tls_key, @map);
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}
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}
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/// Once the program has finished running, this function will consume the
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/// task-local cache of local variables. After the program finishes running,
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/// it updates this cache with the new values of each local variable.
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pub fn consume_cache(&mut self) {
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let map = unsafe {
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local_data::local_data_pop(tls_key).expect("tls is empty")
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};
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do map.consume |name, value| {
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match self.local_vars.find_mut(&name) {
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Some(v) => { v.data = copy *value; }
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None => { fail!("unknown variable %s", name) }
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}
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}
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}
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// Simple functions to record various global things (as strings)
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pub fn record_view_item(&mut self, vi: &str) {
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self.view_items.push_str(vi);
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self.view_items.push_char('\n');
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}
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pub fn record_struct(&mut self, name: &str, s: ~str) {
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let name = name.to_owned();
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self.items.remove(&name);
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self.structs.insert(name, s);
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}
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pub fn record_item(&mut self, name: &str, it: ~str) {
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let name = name.to_owned();
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self.structs.remove(&name);
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self.items.insert(name, it);
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}
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pub fn record_extern(&mut self, name: &str) {
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self.externs.push_str(name);
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self.externs.push_char('\n');
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}
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/// This monster function is responsible for reading the main function
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/// generated by test_code() to determine the type of each local binding
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/// created by the user's input.
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///
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/// Once the types are known, they are inserted into the local_vars map in
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/// this Program (to be deserialized later on
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pub fn register_new_vars(&mut self, blk: &ast::blk, tcx: ty::ctxt) {
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debug!("looking for new variables");
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let newvars = @mut HashMap::new();
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do each_user_local(blk) |local| {
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let mutable = local.node.is_mutbl;
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do each_binding(local) |path, id| {
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let name = do with_pp(token::get_ident_interner()) |pp, _| {
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pprust::print_path(pp, path, false);
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};
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let mut t = ty::node_id_to_type(tcx, id);
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let mut tystr = ~"";
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let mut lvar = LocalVariable {
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ty: ~"",
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data: ~[],
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mutable: mutable,
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alterations: None,
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};
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// This loop is responsible for figuring out what "alterations"
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// are necessary for this local variable.
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loop {
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match ty::get(t).sty {
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// &T encoded will decode to T, so we need to be sure to
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// re-take a loan after decoding
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ty::ty_rptr(_, mt) => {
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if mt.mutbl == ast::m_mutbl {
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tystr.push_str("&mut ");
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} else {
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tystr.push_str("&");
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}
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t = mt.ty;
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}
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// Literals like [1, 2, 3] and (~[0]).slice() will both
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// be serialized to ~[T], whereas it's requested to be a
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// &[T] instead.
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ty::ty_evec(mt, ty::vstore_slice(*)) |
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ty::ty_evec(mt, ty::vstore_fixed(*)) => {
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let vty = ppaux::ty_to_str(tcx, mt.ty);
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let derefs = copy tystr;
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lvar.ty = tystr + "~[" + vty + "]";
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lvar.alterations = Some((tystr + "&[" + vty + "]",
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derefs));
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break;
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}
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// Similar to vectors, &str serializes to ~str, so a
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// borrow must be taken
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ty::ty_estr(ty::vstore_slice(*)) => {
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let derefs = copy tystr;
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lvar.ty = tystr + "~str";
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lvar.alterations = Some((tystr + "&str", derefs));
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break;
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}
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// Don't generate extra stuff if there's no borrowing
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// going on here
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_ if "" == tystr => {
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lvar.ty = ppaux::ty_to_str(tcx, t);
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break;
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}
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// If we're just borrowing (no vectors or strings), then
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// we just need to record how many borrows there were.
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_ => {
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let derefs = copy tystr;
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let tmptystr = ppaux::ty_to_str(tcx, t);
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lvar.alterations = Some((tystr + tmptystr, derefs));
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lvar.ty = tmptystr;
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break;
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}
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}
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}
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newvars.insert(name, lvar);
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}
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}
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// I'm not an @ pointer, so this has to be done outside.
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do newvars.consume |k, v| {
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self.newvars.insert(k, v);
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}
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// helper functions to perform ast iteration
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fn each_user_local(blk: &ast::blk, f: &fn(@ast::local)) {
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do find_user_block(blk) |blk| {
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for blk.node.stmts.each |stmt| {
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match stmt.node {
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ast::stmt_decl(d, _) => {
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match d.node {
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ast::decl_local(l) => { f(l); }
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_ => {}
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}
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}
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_ => {}
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}
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}
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}
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}
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fn find_user_block(blk: &ast::blk, f: &fn(&ast::blk)) {
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for blk.node.stmts.each |stmt| {
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match stmt.node {
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ast::stmt_semi(e, _) => {
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match e.node {
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ast::expr_block(ref blk) => { return f(blk); }
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_ => {}
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}
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}
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_ => {}
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}
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}
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fail!("couldn't find user block");
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}
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}
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}
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impl LocalVariable {
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/// Performs alterations to the code provided, given the name of this
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/// variable.
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fn alter(&self, name: &str, code: &mut ~str) {
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match self.alterations {
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Some((ref real_ty, ref prefix)) => {
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code.push_str(fmt!("let%s %s: %s = %s%s;\n",
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self.mt(), name,
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*real_ty, *prefix, name));
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}
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None => {}
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}
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}
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fn real_ty<'a>(&'a self) -> &'a str {
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match self.alterations {
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Some((ref real_ty, _)) => {
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let ret: &'a str = *real_ty;
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return ret;
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}
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None => {
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let ret: &'a str = self.ty;
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return ret;
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}
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}
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}
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fn mt(&self) -> &'static str {
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if self.mutable {" mut"} else {""}
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}
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}
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