| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| |
| |
| |
| //! Routines for manipulating the control-flow graph. |
| |
| use build::CFG; |
| use rustc::mir::repr::*; |
| use syntax::codemap::Span; |
| |
| impl<'tcx> CFG<'tcx> { |
| pub fn block_data(&self, blk: BasicBlock) -> &BasicBlockData<'tcx> { |
| &self.basic_blocks[blk.index()] |
| } |
| |
| pub fn block_data_mut(&mut self, blk: BasicBlock) -> &mut BasicBlockData<'tcx> { |
| &mut self.basic_blocks[blk.index()] |
| } |
| |
| pub fn start_new_block(&mut self) -> BasicBlock { |
| let node_index = self.basic_blocks.len(); |
| self.basic_blocks.push(BasicBlockData::new(None)); |
| BasicBlock::new(node_index) |
| } |
| |
| pub fn push(&mut self, block: BasicBlock, statement: Statement<'tcx>) { |
| debug!("push({:?}, {:?})", block, statement); |
| self.block_data_mut(block).statements.push(statement); |
| } |
| |
| pub fn push_drop(&mut self, block: BasicBlock, span: Span, |
| kind: DropKind, lvalue: &Lvalue<'tcx>) { |
| self.push(block, Statement { |
| span: span, |
| kind: StatementKind::Drop(kind, lvalue.clone()) |
| }); |
| } |
| |
| pub fn push_assign(&mut self, |
| block: BasicBlock, |
| span: Span, |
| lvalue: &Lvalue<'tcx>, |
| rvalue: Rvalue<'tcx>) { |
| self.push(block, Statement { |
| span: span, |
| kind: StatementKind::Assign(lvalue.clone(), rvalue) |
| }); |
| } |
| |
| pub fn push_assign_constant(&mut self, |
| block: BasicBlock, |
| span: Span, |
| temp: &Lvalue<'tcx>, |
| constant: Constant<'tcx>) { |
| self.push_assign(block, span, temp, Rvalue::Use(Operand::Constant(constant))); |
| } |
| |
| pub fn push_assign_unit(&mut self, |
| block: BasicBlock, |
| span: Span, |
| lvalue: &Lvalue<'tcx>) { |
| self.push_assign(block, span, lvalue, Rvalue::Aggregate( |
| AggregateKind::Tuple, vec![] |
| )); |
| } |
| |
| pub fn terminate(&mut self, |
| block: BasicBlock, |
| terminator: Terminator<'tcx>) { |
| debug_assert!(self.block_data(block).terminator.is_none(), |
| "terminate: block {:?} already has a terminator set", block); |
| self.block_data_mut(block).terminator = Some(terminator); |
| } |
| } |
| |