2015-08-18 17:59:21 -04:00
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// Copyright 2012-2014 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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2015-11-09 20:54:17 -05:00
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use hair::cx::Cx;
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2016-09-24 17:45:24 +03:00
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use hair::Pattern;
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2016-05-02 23:11:19 +03:00
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use rustc::middle::region::{CodeExtent, CodeExtentData, ROOT_CODE_EXTENT};
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2016-04-15 17:11:24 +03:00
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use rustc::ty::{self, Ty};
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2016-09-19 23:50:00 +03:00
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use rustc::mir::*;
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2016-06-07 17:28:36 +03:00
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use rustc::util::nodemap::NodeMap;
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2016-03-29 08:50:44 +03:00
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use rustc::hir;
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2016-04-15 17:11:24 +03:00
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use syntax::abi::Abi;
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use syntax::ast;
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2016-11-16 08:21:52 +00:00
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use syntax::symbol::keywords;
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2016-06-21 18:08:13 -04:00
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use syntax_pos::Span;
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2015-10-05 12:31:48 -04:00
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2016-06-07 17:28:36 +03:00
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use rustc_data_structures::indexed_vec::{IndexVec, Idx};
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use std::u32;
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2016-05-11 04:14:41 +03:00
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pub struct Builder<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
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hir: Cx<'a, 'gcx, 'tcx>,
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cfg: CFG<'tcx>,
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fn_span: Span,
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arg_count: usize,
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2016-04-20 00:13:30 +03:00
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/// the current set of scopes, updated as we traverse;
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/// see the `scope` module for more details
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2015-10-05 12:31:48 -04:00
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scopes: Vec<scope::Scope<'tcx>>,
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2016-03-09 11:04:26 -05:00
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2017-02-28 11:05:03 -08:00
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/// the current set of breakables; see the `scope` module for more
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2016-04-20 00:13:30 +03:00
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/// details
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breakable_scopes: Vec<scope::BreakableScope<'tcx>>,
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2016-04-20 00:13:30 +03:00
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/// the vector of all scopes that we have created thus far;
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/// we track this for debuginfo later
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2016-06-07 17:28:36 +03:00
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visibility_scopes: IndexVec<VisibilityScope, VisibilityScopeData>,
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2016-05-31 20:27:36 +03:00
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visibility_scope: VisibilityScope,
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2016-09-25 01:38:27 +02:00
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/// Maps node ids of variable bindings to the `Local`s created for them.
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var_indices: NodeMap<Local>,
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local_decls: IndexVec<Local, LocalDecl<'tcx>>,
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2016-01-16 00:36:32 +02:00
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unit_temp: Option<Lvalue<'tcx>>,
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2016-03-23 20:46:38 -04:00
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2016-04-20 00:13:30 +03:00
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/// cached block with the RESUME terminator; this is created
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/// when first set of cleanups are built.
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cached_resume_block: Option<BasicBlock>,
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2016-04-20 00:13:30 +03:00
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/// cached block with the RETURN terminator
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cached_return_block: Option<BasicBlock>,
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}
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2015-10-05 12:31:48 -04:00
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struct CFG<'tcx> {
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basic_blocks: IndexVec<BasicBlock, BasicBlockData<'tcx>>,
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}
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2016-05-31 20:27:36 +03:00
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct ScopeId(u32);
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2016-06-07 17:28:36 +03:00
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impl Idx for ScopeId {
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fn new(index: usize) -> ScopeId {
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assert!(index < (u32::MAX as usize));
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ScopeId(index as u32)
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}
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fn index(self) -> usize {
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self.0 as usize
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}
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}
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2015-08-18 17:59:21 -04:00
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///////////////////////////////////////////////////////////////////////////
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2016-02-03 13:25:07 +01:00
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/// The `BlockAnd` "monad" packages up the new basic block along with a
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/// produced value (sometimes just unit, of course). The `unpack!`
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/// macro (and methods below) makes working with `BlockAnd` much more
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/// convenient.
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2015-08-18 17:59:21 -04:00
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#[must_use] // if you don't use one of these results, you're leaving a dangling edge
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2015-11-21 17:39:15 +03:00
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pub struct BlockAnd<T>(BasicBlock, T);
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2015-11-19 16:37:34 +01:00
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trait BlockAndExtension {
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fn and<T>(self, v: T) -> BlockAnd<T>;
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fn unit(self) -> BlockAnd<()>;
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}
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impl BlockAndExtension for BasicBlock {
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fn and<T>(self, v: T) -> BlockAnd<T> {
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BlockAnd(self, v)
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}
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fn unit(self) -> BlockAnd<()> {
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BlockAnd(self, ())
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}
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}
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/// Update a block pointer and return the value.
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/// Use it like `let x = unpack!(block = self.foo(block, foo))`.
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macro_rules! unpack {
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($x:ident = $c:expr) => {
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{
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let BlockAnd(b, v) = $c;
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$x = b;
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v
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}
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};
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($c:expr) => {
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{
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let BlockAnd(b, ()) = $c;
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b
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}
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};
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}
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///////////////////////////////////////////////////////////////////////////
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2016-02-03 13:25:07 +01:00
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/// the main entry point for building MIR for a function
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2015-08-18 17:59:21 -04:00
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2016-05-11 04:14:41 +03:00
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pub fn construct_fn<'a, 'gcx, 'tcx, A>(hir: Cx<'a, 'gcx, 'tcx>,
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fn_id: ast::NodeId,
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arguments: A,
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abi: Abi,
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2016-08-02 13:46:39 +08:00
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return_ty: Ty<'gcx>,
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body: &'gcx hir::Body)
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-> Mir<'tcx>
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where A: Iterator<Item=(Ty<'gcx>, Option<&'gcx hir::Pat>)>
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{
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let arguments: Vec<_> = arguments.collect();
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let tcx = hir.tcx();
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2017-01-26 02:41:06 +02:00
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let span = tcx.hir.span(fn_id);
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2016-09-25 01:38:27 +02:00
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let mut builder = Builder::new(hir, span, arguments.len(), return_ty);
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2016-03-18 08:52:13 -04:00
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2016-03-23 12:26:37 -04:00
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let call_site_extent =
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tcx.region_maps.lookup_code_extent(
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CodeExtentData::CallSiteScope { fn_id: fn_id, body_id: body.value.id });
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2016-04-15 17:11:24 +03:00
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let arg_extent =
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tcx.region_maps.lookup_code_extent(
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CodeExtentData::ParameterScope { fn_id: fn_id, body_id: body.value.id });
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2016-04-15 17:11:24 +03:00
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let mut block = START_BLOCK;
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unpack!(block = builder.in_scope(call_site_extent, block, |builder| {
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unpack!(block = builder.in_scope(arg_extent, block, |builder| {
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2016-12-20 22:46:11 +02:00
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builder.args_and_body(block, &arguments, arg_extent, &body.value)
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}));
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2016-10-19 00:25:03 -07:00
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// Attribute epilogue to function's closing brace
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let fn_end = Span { lo: span.hi, ..span };
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let source_info = builder.source_info(fn_end);
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2016-04-20 00:13:30 +03:00
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let return_block = builder.return_block();
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2016-06-07 19:21:56 +03:00
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builder.cfg.terminate(block, source_info,
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2016-04-20 00:13:30 +03:00
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TerminatorKind::Goto { target: return_block });
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2016-06-07 19:21:56 +03:00
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builder.cfg.terminate(return_block, source_info,
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TerminatorKind::Return);
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2016-09-25 01:38:27 +02:00
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return_block.unit()
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2016-04-15 17:11:24 +03:00
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}));
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assert_eq!(block, builder.return_block());
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2016-09-26 22:44:01 +02:00
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let mut spread_arg = None;
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2016-11-10 16:49:53 +02:00
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if abi == Abi::RustCall {
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// RustCall pseudo-ABI untuples the last argument.
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spread_arg = Some(Local::new(arguments.len()));
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2016-04-15 17:11:24 +03:00
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}
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2016-03-22 16:05:28 -04:00
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2016-04-16 21:51:26 +03:00
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// Gather the upvars of a closure, if any.
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let upvar_decls: Vec<_> = tcx.with_freevars(fn_id, |freevars| {
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freevars.iter().map(|fv| {
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let var_id = tcx.hir.as_local_node_id(fv.def.def_id()).unwrap();
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2017-01-06 21:54:24 +02:00
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let by_ref = hir.tables().upvar_capture(ty::UpvarId {
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2016-08-31 14:08:22 +03:00
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var_id: var_id,
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2016-04-16 21:51:26 +03:00
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closure_expr_id: fn_id
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}).map_or(false, |capture| match capture {
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ty::UpvarCapture::ByValue => false,
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ty::UpvarCapture::ByRef(..) => true
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});
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let mut decl = UpvarDecl {
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2016-04-18 22:53:50 +03:00
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debug_name: keywords::Invalid.name(),
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2016-04-16 21:51:26 +03:00
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by_ref: by_ref
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};
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2017-01-26 02:41:06 +02:00
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if let Some(hir::map::NodeLocal(pat)) = tcx.hir.find(var_id) {
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2016-11-25 13:21:19 +02:00
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if let hir::PatKind::Binding(_, _, ref ident, _) = pat.node {
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2016-03-06 15:54:44 +03:00
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decl.debug_name = ident.node;
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2016-04-16 21:51:26 +03:00
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}
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}
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decl
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}).collect()
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});
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2016-11-03 14:22:57 +11:00
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let mut mir = builder.finish(upvar_decls, return_ty);
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2016-09-26 22:44:01 +02:00
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mir.spread_arg = spread_arg;
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2016-11-03 14:22:57 +11:00
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mir
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}
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2016-05-11 04:14:41 +03:00
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pub fn construct_const<'a, 'gcx, 'tcx>(hir: Cx<'a, 'gcx, 'tcx>,
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2016-12-21 12:32:59 +02:00
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body_id: hir::BodyId)
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2016-11-03 14:22:57 +11:00
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-> Mir<'tcx> {
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2016-05-02 23:11:19 +03:00
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let tcx = hir.tcx();
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2017-01-26 02:41:06 +02:00
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let ast_expr = &tcx.hir.body(body_id).value;
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2017-01-06 21:54:24 +02:00
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let ty = hir.tables().expr_ty_adjusted(ast_expr);
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2017-01-26 02:41:06 +02:00
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let span = tcx.hir.span(tcx.hir.body_owner(body_id));
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2016-09-25 01:38:27 +02:00
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let mut builder = Builder::new(hir, span, 0, ty);
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2016-05-02 23:11:19 +03:00
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2016-08-14 06:34:14 +03:00
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let extent = tcx.region_maps.temporary_scope(ast_expr.id)
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.unwrap_or(ROOT_CODE_EXTENT);
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2016-05-02 23:11:19 +03:00
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let mut block = START_BLOCK;
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2016-05-31 20:27:36 +03:00
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let _ = builder.in_scope(extent, block, |builder| {
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2016-05-02 23:11:19 +03:00
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let expr = builder.hir.mirror(ast_expr);
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2016-09-25 01:38:27 +02:00
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unpack!(block = builder.into(&Lvalue::Local(RETURN_POINTER), block, expr));
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2016-05-02 23:11:19 +03:00
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2016-06-07 19:21:56 +03:00
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let source_info = builder.source_info(span);
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2016-05-02 23:11:19 +03:00
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let return_block = builder.return_block();
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2016-06-07 19:21:56 +03:00
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builder.cfg.terminate(block, source_info,
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2016-05-02 23:11:19 +03:00
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TerminatorKind::Goto { target: return_block });
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2016-06-07 19:21:56 +03:00
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builder.cfg.terminate(return_block, source_info,
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2016-05-02 23:11:19 +03:00
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TerminatorKind::Return);
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return_block.unit()
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});
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2016-09-25 01:38:27 +02:00
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builder.finish(vec![], ty)
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2016-05-02 23:11:19 +03:00
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}
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2017-02-15 15:00:20 +02:00
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pub fn construct_error<'a, 'gcx, 'tcx>(hir: Cx<'a, 'gcx, 'tcx>,
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body_id: hir::BodyId)
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-> Mir<'tcx> {
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let span = hir.tcx().hir.span(hir.tcx().hir.body_owner(body_id));
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let ty = hir.tcx().types.err;
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let mut builder = Builder::new(hir, span, 0, ty);
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let source_info = builder.source_info(span);
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builder.cfg.terminate(START_BLOCK, source_info, TerminatorKind::Unreachable);
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builder.finish(vec![], ty)
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}
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2016-05-11 04:14:41 +03:00
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impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
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2016-09-25 01:38:27 +02:00
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fn new(hir: Cx<'a, 'gcx, 'tcx>,
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span: Span,
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arg_count: usize,
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return_ty: Ty<'tcx>)
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-> Builder<'a, 'gcx, 'tcx> {
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2016-04-15 17:11:24 +03:00
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let mut builder = Builder {
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hir: hir,
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2016-06-07 17:28:36 +03:00
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cfg: CFG { basic_blocks: IndexVec::new() },
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2016-04-15 17:11:24 +03:00
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fn_span: span,
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2016-09-25 01:38:27 +02:00
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arg_count: arg_count,
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2016-04-15 17:11:24 +03:00
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scopes: vec![],
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2016-06-07 17:28:36 +03:00
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visibility_scopes: IndexVec::new(),
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2016-05-31 20:27:36 +03:00
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visibility_scope: ARGUMENT_VISIBILITY_SCOPE,
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2017-02-28 11:05:03 -08:00
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breakable_scopes: vec![],
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2016-09-25 01:38:27 +02:00
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local_decls: IndexVec::from_elem_n(LocalDecl::new_return_pointer(return_ty), 1),
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2016-06-07 17:28:36 +03:00
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var_indices: NodeMap(),
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2016-04-15 17:11:24 +03:00
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unit_temp: None,
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cached_resume_block: None,
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cached_return_block: None
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};
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|
|
|
|
assert_eq!(builder.cfg.start_new_block(), START_BLOCK);
|
2016-05-31 20:27:36 +03:00
|
|
|
assert_eq!(builder.new_visibility_scope(span), ARGUMENT_VISIBILITY_SCOPE);
|
|
|
|
builder.visibility_scopes[ARGUMENT_VISIBILITY_SCOPE].parent_scope = None;
|
2016-04-15 17:11:24 +03:00
|
|
|
|
|
|
|
builder
|
|
|
|
}
|
|
|
|
|
|
|
|
fn finish(self,
|
|
|
|
upvar_decls: Vec<UpvarDecl>,
|
2016-08-02 13:46:39 +08:00
|
|
|
return_ty: Ty<'tcx>)
|
2016-11-03 14:22:57 +11:00
|
|
|
-> Mir<'tcx> {
|
2016-04-15 17:11:24 +03:00
|
|
|
for (index, block) in self.cfg.basic_blocks.iter().enumerate() {
|
|
|
|
if block.terminator.is_none() {
|
|
|
|
span_bug!(self.fn_span, "no terminator on block {:?}", index);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-11-03 14:22:57 +11:00
|
|
|
Mir::new(self.cfg.basic_blocks,
|
|
|
|
self.visibility_scopes,
|
|
|
|
IndexVec::new(),
|
|
|
|
return_ty,
|
|
|
|
self.local_decls,
|
|
|
|
self.arg_count,
|
|
|
|
upvar_decls,
|
|
|
|
self.fn_span
|
|
|
|
)
|
2016-04-15 17:11:24 +03:00
|
|
|
}
|
|
|
|
|
2016-09-25 01:38:27 +02:00
|
|
|
fn args_and_body(&mut self,
|
|
|
|
mut block: BasicBlock,
|
|
|
|
arguments: &[(Ty<'gcx>, Option<&'gcx hir::Pat>)],
|
|
|
|
argument_extent: CodeExtent,
|
2016-10-26 02:27:14 +03:00
|
|
|
ast_body: &'gcx hir::Expr)
|
2016-09-25 01:38:27 +02:00
|
|
|
-> BlockAnd<()>
|
2015-08-18 17:59:21 -04:00
|
|
|
{
|
2016-09-25 01:38:27 +02:00
|
|
|
// Allocate locals for the function arguments
|
|
|
|
for &(ty, pattern) in arguments.iter() {
|
|
|
|
// If this is a simple binding pattern, give the local a nice name for debuginfo.
|
|
|
|
let mut name = None;
|
|
|
|
if let Some(pat) = pattern {
|
2016-11-25 13:21:19 +02:00
|
|
|
if let hir::PatKind::Binding(_, _, ref ident, _) = pat.node {
|
2016-09-25 01:38:27 +02:00
|
|
|
name = Some(ident.node);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
self.local_decls.push(LocalDecl {
|
|
|
|
mutability: Mutability::Not,
|
|
|
|
ty: ty,
|
|
|
|
source_info: None,
|
|
|
|
name: name,
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
2016-05-31 20:27:36 +03:00
|
|
|
let mut scope = None;
|
2016-09-25 01:38:27 +02:00
|
|
|
// Bind the argument patterns
|
|
|
|
for (index, &(ty, pattern)) in arguments.iter().enumerate() {
|
|
|
|
// Function arguments always get the first Local indices after the return pointer
|
|
|
|
let lvalue = Lvalue::Local(Local::new(index + 1));
|
|
|
|
|
2016-04-15 17:11:24 +03:00
|
|
|
if let Some(pattern) = pattern {
|
2017-01-06 21:54:24 +02:00
|
|
|
let pattern = Pattern::from_hir(self.hir.tcx(), self.hir.tables(), pattern);
|
2016-10-26 02:27:14 +03:00
|
|
|
scope = self.declare_bindings(scope, ast_body.span, &pattern);
|
2016-05-31 20:27:36 +03:00
|
|
|
unpack!(block = self.lvalue_into_pattern(block, pattern, &lvalue));
|
2016-04-15 17:11:24 +03:00
|
|
|
}
|
2016-03-23 12:26:37 -04:00
|
|
|
|
2016-04-15 17:11:24 +03:00
|
|
|
// Make sure we drop (parts of) the argument even when not matched on.
|
2016-10-26 02:27:14 +03:00
|
|
|
self.schedule_drop(pattern.as_ref().map_or(ast_body.span, |pat| pat.span),
|
2016-04-15 17:11:24 +03:00
|
|
|
argument_extent, &lvalue, ty);
|
|
|
|
|
2016-09-25 01:38:27 +02:00
|
|
|
}
|
2016-03-23 12:26:37 -04:00
|
|
|
|
2016-05-31 20:27:36 +03:00
|
|
|
// Enter the argument pattern bindings visibility scope, if it exists.
|
|
|
|
if let Some(visibility_scope) = scope {
|
|
|
|
self.visibility_scope = visibility_scope;
|
|
|
|
}
|
|
|
|
|
2016-10-26 02:27:14 +03:00
|
|
|
let body = self.hir.mirror(ast_body);
|
|
|
|
self.into(&Lvalue::Local(RETURN_POINTER), block, body)
|
2015-08-18 17:59:21 -04:00
|
|
|
}
|
2016-01-16 00:36:32 +02:00
|
|
|
|
|
|
|
fn get_unit_temp(&mut self) -> Lvalue<'tcx> {
|
|
|
|
match self.unit_temp {
|
|
|
|
Some(ref tmp) => tmp.clone(),
|
|
|
|
None => {
|
|
|
|
let ty = self.hir.unit_ty();
|
|
|
|
let tmp = self.temp(ty);
|
|
|
|
self.unit_temp = Some(tmp.clone());
|
|
|
|
tmp
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2016-04-20 00:13:30 +03:00
|
|
|
|
|
|
|
fn return_block(&mut self) -> BasicBlock {
|
|
|
|
match self.cached_return_block {
|
|
|
|
Some(rb) => rb,
|
|
|
|
None => {
|
|
|
|
let rb = self.cfg.start_new_block();
|
|
|
|
self.cached_return_block = Some(rb);
|
|
|
|
rb
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-08-18 17:59:21 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
// Builder methods are broken up into modules, depending on what kind
|
|
|
|
// of thing is being translated. Note that they use the `unpack` macro
|
|
|
|
// above extensively.
|
|
|
|
|
|
|
|
mod block;
|
|
|
|
mod cfg;
|
|
|
|
mod expr;
|
|
|
|
mod into;
|
|
|
|
mod matches;
|
|
|
|
mod misc;
|
|
|
|
mod scope;
|