461 lines
16 KiB
Rust
461 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 lint;
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use metadata::cstore::CStore;
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use metadata::filesearch;
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use session::search_paths::PathKind;
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use util::nodemap::NodeMap;
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use syntax::ast::NodeId;
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use syntax::codemap::Span;
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use syntax::diagnostic::{self, Emitter};
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use syntax::diagnostics;
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use syntax::feature_gate;
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use syntax::parse;
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use syntax::parse::token;
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use syntax::parse::ParseSess;
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use syntax::{ast, codemap};
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use syntax::feature_gate::AttributeType;
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use rustc_back::target::Target;
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use std::path::{Path, PathBuf};
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use std::cell::{Cell, RefCell};
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use std::env;
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pub mod config;
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pub mod search_paths;
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// Represents the data associated with a compilation
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// session for a single crate.
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pub struct Session {
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pub target: config::Config,
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pub host: Target,
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pub opts: config::Options,
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pub cstore: CStore,
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pub parse_sess: ParseSess,
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// For a library crate, this is always none
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pub entry_fn: RefCell<Option<(NodeId, codemap::Span)>>,
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pub entry_type: Cell<Option<config::EntryFnType>>,
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pub plugin_registrar_fn: Cell<Option<ast::NodeId>>,
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pub default_sysroot: Option<PathBuf>,
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// The name of the root source file of the crate, in the local file system.
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// The path is always expected to be absolute. `None` means that there is no
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// source file.
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pub local_crate_source_file: Option<PathBuf>,
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pub working_dir: PathBuf,
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pub lint_store: RefCell<lint::LintStore>,
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pub lints: RefCell<NodeMap<Vec<(lint::LintId, codemap::Span, String)>>>,
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pub plugin_llvm_passes: RefCell<Vec<String>>,
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pub plugin_attributes: RefCell<Vec<(String, AttributeType)>>,
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pub crate_types: RefCell<Vec<config::CrateType>>,
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pub crate_metadata: RefCell<Vec<String>>,
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pub features: RefCell<feature_gate::Features>,
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pub delayed_span_bug: RefCell<Option<(codemap::Span, String)>>,
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/// The maximum recursion limit for potentially infinitely recursive
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/// operations such as auto-dereference and monomorphization.
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pub recursion_limit: Cell<usize>,
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pub can_print_warnings: bool,
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next_node_id: Cell<ast::NodeId>
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}
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impl Session {
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pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
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if self.opts.treat_err_as_bug {
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self.span_bug(sp, msg);
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}
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panic!(self.diagnostic().span_fatal(sp, msg))
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}
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pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
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if self.opts.treat_err_as_bug {
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self.span_bug(sp, msg);
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}
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panic!(self.diagnostic().span_fatal_with_code(sp, msg, code))
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}
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pub fn fatal(&self, msg: &str) -> ! {
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if self.opts.treat_err_as_bug {
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self.bug(msg);
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}
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self.diagnostic().handler().fatal(msg)
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}
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pub fn span_err(&self, sp: Span, msg: &str) {
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if self.opts.treat_err_as_bug {
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self.span_bug(sp, msg);
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}
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match split_msg_into_multilines(msg) {
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Some(msg) => self.diagnostic().span_err(sp, &msg[..]),
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None => self.diagnostic().span_err(sp, msg)
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}
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}
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pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
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if self.opts.treat_err_as_bug {
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self.span_bug(sp, msg);
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}
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match split_msg_into_multilines(msg) {
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Some(msg) => self.diagnostic().span_err_with_code(sp, &msg[..], code),
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None => self.diagnostic().span_err_with_code(sp, msg, code)
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}
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}
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pub fn err(&self, msg: &str) {
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if self.opts.treat_err_as_bug {
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self.bug(msg);
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}
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self.diagnostic().handler().err(msg)
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}
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pub fn err_count(&self) -> usize {
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self.diagnostic().handler().err_count()
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}
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pub fn has_errors(&self) -> bool {
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self.diagnostic().handler().has_errors()
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}
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pub fn abort_if_errors(&self) {
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self.diagnostic().handler().abort_if_errors();
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let delayed_bug = self.delayed_span_bug.borrow();
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match *delayed_bug {
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Some((span, ref errmsg)) => {
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self.diagnostic().span_bug(span, errmsg);
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},
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_ => {}
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}
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}
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pub fn span_warn(&self, sp: Span, msg: &str) {
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if self.can_print_warnings {
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self.diagnostic().span_warn(sp, msg)
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}
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}
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pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
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if self.can_print_warnings {
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self.diagnostic().span_warn_with_code(sp, msg, code)
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}
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}
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pub fn warn(&self, msg: &str) {
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if self.can_print_warnings {
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self.diagnostic().handler().warn(msg)
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}
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}
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pub fn opt_span_warn(&self, opt_sp: Option<Span>, msg: &str) {
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match opt_sp {
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Some(sp) => self.span_warn(sp, msg),
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None => self.warn(msg),
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}
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}
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pub fn span_note(&self, sp: Span, msg: &str) {
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self.diagnostic().span_note(sp, msg)
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}
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pub fn span_end_note(&self, sp: Span, msg: &str) {
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self.diagnostic().span_end_note(sp, msg)
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}
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/// Prints out a message with a suggested edit of the code.
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///
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/// See `diagnostic::RenderSpan::Suggestion` for more information.
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pub fn span_suggestion(&self, sp: Span, msg: &str, suggestion: String) {
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self.diagnostic().span_suggestion(sp, msg, suggestion)
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}
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pub fn span_help(&self, sp: Span, msg: &str) {
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self.diagnostic().span_help(sp, msg)
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}
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pub fn fileline_note(&self, sp: Span, msg: &str) {
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self.diagnostic().fileline_note(sp, msg)
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}
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pub fn fileline_help(&self, sp: Span, msg: &str) {
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self.diagnostic().fileline_help(sp, msg)
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}
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pub fn note(&self, msg: &str) {
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self.diagnostic().handler().note(msg)
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}
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pub fn help(&self, msg: &str) {
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self.diagnostic().handler().help(msg)
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}
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pub fn opt_span_bug(&self, opt_sp: Option<Span>, msg: &str) -> ! {
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match opt_sp {
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Some(sp) => self.span_bug(sp, msg),
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None => self.bug(msg),
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}
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}
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/// Delay a span_bug() call until abort_if_errors()
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pub fn delay_span_bug(&self, sp: Span, msg: &str) {
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let mut delayed = self.delayed_span_bug.borrow_mut();
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*delayed = Some((sp, msg.to_string()));
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}
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pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
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self.diagnostic().span_bug(sp, msg)
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}
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pub fn bug(&self, msg: &str) -> ! {
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self.diagnostic().handler().bug(msg)
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}
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pub fn span_unimpl(&self, sp: Span, msg: &str) -> ! {
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self.diagnostic().span_unimpl(sp, msg)
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}
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pub fn unimpl(&self, msg: &str) -> ! {
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self.diagnostic().handler().unimpl(msg)
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}
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pub fn add_lint(&self,
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lint: &'static lint::Lint,
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id: ast::NodeId,
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sp: Span,
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msg: String) {
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let lint_id = lint::LintId::of(lint);
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let mut lints = self.lints.borrow_mut();
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match lints.get_mut(&id) {
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Some(arr) => { arr.push((lint_id, sp, msg)); return; }
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None => {}
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}
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lints.insert(id, vec!((lint_id, sp, msg)));
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}
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pub fn next_node_id(&self) -> ast::NodeId {
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self.reserve_node_ids(1)
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}
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pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
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let id = self.next_node_id.get();
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match id.checked_add(count) {
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Some(next) => self.next_node_id.set(next),
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None => self.bug("Input too large, ran out of node ids!")
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}
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id
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}
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pub fn diagnostic<'a>(&'a self) -> &'a diagnostic::SpanHandler {
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&self.parse_sess.span_diagnostic
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}
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pub fn codemap<'a>(&'a self) -> &'a codemap::CodeMap {
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self.parse_sess.codemap()
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}
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// This exists to help with refactoring to eliminate impossible
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// cases later on
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pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
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self.span_bug(sp,
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&format!("impossible case reached: {}", msg));
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}
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pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
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pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
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pub fn count_llvm_insns(&self) -> bool {
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self.opts.debugging_opts.count_llvm_insns
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}
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pub fn count_type_sizes(&self) -> bool {
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self.opts.debugging_opts.count_type_sizes
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}
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pub fn time_llvm_passes(&self) -> bool {
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self.opts.debugging_opts.time_llvm_passes
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}
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pub fn trans_stats(&self) -> bool { self.opts.debugging_opts.trans_stats }
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pub fn meta_stats(&self) -> bool { self.opts.debugging_opts.meta_stats }
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pub fn asm_comments(&self) -> bool { self.opts.debugging_opts.asm_comments }
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pub fn no_verify(&self) -> bool { self.opts.debugging_opts.no_verify }
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pub fn borrowck_stats(&self) -> bool { self.opts.debugging_opts.borrowck_stats }
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pub fn print_llvm_passes(&self) -> bool {
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self.opts.debugging_opts.print_llvm_passes
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}
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pub fn lto(&self) -> bool {
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self.opts.cg.lto
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}
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pub fn no_landing_pads(&self) -> bool {
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self.opts.debugging_opts.no_landing_pads
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}
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pub fn unstable_options(&self) -> bool {
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self.opts.debugging_opts.unstable_options
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}
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pub fn print_enum_sizes(&self) -> bool {
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self.opts.debugging_opts.print_enum_sizes
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}
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pub fn sysroot<'a>(&'a self) -> &'a Path {
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match self.opts.maybe_sysroot {
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Some (ref sysroot) => sysroot,
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None => self.default_sysroot.as_ref()
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.expect("missing sysroot and default_sysroot in Session")
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}
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}
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pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
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filesearch::FileSearch::new(self.sysroot(),
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&self.opts.target_triple,
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&self.opts.search_paths,
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kind)
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}
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pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
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filesearch::FileSearch::new(
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self.sysroot(),
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config::host_triple(),
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&self.opts.search_paths,
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kind)
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}
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}
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fn split_msg_into_multilines(msg: &str) -> Option<String> {
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// Conditions for enabling multi-line errors:
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if !msg.contains("mismatched types") &&
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!msg.contains("type mismatch resolving") &&
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!msg.contains("if and else have incompatible types") &&
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!msg.contains("if may be missing an else clause") &&
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!msg.contains("match arms have incompatible types") &&
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!msg.contains("structure constructor specifies a structure of type") &&
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!msg.contains("has an incompatible type for trait") {
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return None
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}
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let first = msg.match_indices("expected").filter(|s| {
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s.0 > 0 && (msg.char_at_reverse(s.0) == ' ' ||
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msg.char_at_reverse(s.0) == '(')
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}).map(|(a, b)| (a - 1, b));
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let second = msg.match_indices("found").filter(|s| {
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msg.char_at_reverse(s.0) == ' '
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}).map(|(a, b)| (a - 1, b));
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let mut new_msg = String::new();
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let mut head = 0;
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// Insert `\n` before expected and found.
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for (pos1, pos2) in first.zip(second) {
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new_msg = new_msg +
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// A `(` may be preceded by a space and it should be trimmed
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msg[head..pos1.0].trim_right() + // prefix
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"\n" + // insert before first
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&msg[pos1.0..pos1.1] + // insert what first matched
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&msg[pos1.1..pos2.0] + // between matches
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"\n " + // insert before second
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// 123
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// `expected` is 3 char longer than `found`. To align the types,
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// `found` gets 3 spaces prepended.
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&msg[pos2.0..pos2.1]; // insert what second matched
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head = pos2.1;
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}
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let mut tail = &msg[head..];
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let third = tail.find("(values differ")
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.or(tail.find("(lifetime"))
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.or(tail.find("(cyclic type of infinite size"));
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// Insert `\n` before any remaining messages which match.
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if let Some(pos) = third {
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// The end of the message may just be wrapped in `()` without
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// `expected`/`found`. Push this also to a new line and add the
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// final tail after.
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new_msg = new_msg +
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// `(` is usually preceded by a space and should be trimmed.
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tail[..pos].trim_right() + // prefix
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"\n" + // insert before paren
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&tail[pos..]; // append the tail
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tail = "";
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}
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new_msg.push_str(tail);
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return Some(new_msg);
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}
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pub fn build_session(sopts: config::Options,
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local_crate_source_file: Option<PathBuf>,
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registry: diagnostics::registry::Registry)
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-> Session {
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// FIXME: This is not general enough to make the warning lint completely override
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// normal diagnostic warnings, since the warning lint can also be denied and changed
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// later via the source code.
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let can_print_warnings = sopts.lint_opts
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.iter()
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.filter(|&&(ref key, _)| *key == "warnings")
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.map(|&(_, ref level)| *level != lint::Allow)
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.last()
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.unwrap_or(true);
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let codemap = codemap::CodeMap::new();
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let diagnostic_handler =
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diagnostic::Handler::new(sopts.color, Some(registry), can_print_warnings);
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let span_diagnostic_handler =
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diagnostic::SpanHandler::new(diagnostic_handler, codemap);
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build_session_(sopts, local_crate_source_file, span_diagnostic_handler)
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}
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pub fn build_session_(sopts: config::Options,
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local_crate_source_file: Option<PathBuf>,
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span_diagnostic: diagnostic::SpanHandler)
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-> Session {
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let host = match Target::search(config::host_triple()) {
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Ok(t) => t,
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Err(e) => {
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span_diagnostic.handler()
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.fatal(&format!("Error loading host specification: {}", e));
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}
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};
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let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
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let p_s = parse::ParseSess::with_span_handler(span_diagnostic);
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let default_sysroot = match sopts.maybe_sysroot {
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Some(_) => None,
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None => Some(filesearch::get_or_default_sysroot())
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};
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// Make the path absolute, if necessary
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let local_crate_source_file = local_crate_source_file.map(|path|
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if path.is_absolute() {
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path.clone()
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} else {
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env::current_dir().unwrap().join(&path)
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}
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);
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let can_print_warnings = sopts.lint_opts
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.iter()
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.filter(|&&(ref key, _)| *key == "warnings")
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.map(|&(_, ref level)| *level != lint::Allow)
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.last()
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.unwrap_or(true);
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let sess = Session {
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target: target_cfg,
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host: host,
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opts: sopts,
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cstore: CStore::new(token::get_ident_interner()),
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parse_sess: p_s,
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// For a library crate, this is always none
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entry_fn: RefCell::new(None),
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entry_type: Cell::new(None),
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plugin_registrar_fn: Cell::new(None),
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default_sysroot: default_sysroot,
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local_crate_source_file: local_crate_source_file,
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working_dir: env::current_dir().unwrap(),
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lint_store: RefCell::new(lint::LintStore::new()),
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lints: RefCell::new(NodeMap()),
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plugin_llvm_passes: RefCell::new(Vec::new()),
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plugin_attributes: RefCell::new(Vec::new()),
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crate_types: RefCell::new(Vec::new()),
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crate_metadata: RefCell::new(Vec::new()),
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delayed_span_bug: RefCell::new(None),
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features: RefCell::new(feature_gate::Features::new()),
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recursion_limit: Cell::new(64),
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can_print_warnings: can_print_warnings,
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next_node_id: Cell::new(1)
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};
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sess
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}
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// Seems out of place, but it uses session, so I'm putting it here
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pub fn expect<T, M>(sess: &Session, opt: Option<T>, msg: M) -> T where
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M: FnOnce() -> String,
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{
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diagnostic::expect(sess.diagnostic(), opt, msg)
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}
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pub fn early_error(msg: &str) -> ! {
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let mut emitter = diagnostic::EmitterWriter::stderr(diagnostic::Auto, None);
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emitter.emit(None, msg, None, diagnostic::Fatal);
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panic!(diagnostic::FatalError);
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}
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pub fn early_warn(msg: &str) {
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let mut emitter = diagnostic::EmitterWriter::stderr(diagnostic::Auto, None);
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emitter.emit(None, msg, None, diagnostic::Warning);
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}
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