[51587aa] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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[a08ba92] | 7 | // MLEMutator.cc -- |
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[51587aa] | 8 | // |
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[843054c2] | 9 | // Author : Rodolfo G. Esteves |
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[51587aa] | 10 | // Created On : Mon May 18 07:44:20 2015 |
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[be5aa1b] | 11 | // Last Modified By : Rob Schluntz |
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| 12 | // Last Modified On : Wed May 27 16:19:32 2015 |
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| 13 | // Update Count : 44 |
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[51587aa] | 14 | // |
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[a08ba92] | 15 | |
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[51b7345] | 16 | #include <cassert> |
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| 17 | #include <algorithm> |
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| 18 | |
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| 19 | #include "MLEMutator.h" |
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| 20 | #include "SynTree/Statement.h" |
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| 21 | |
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| 22 | namespace ControlStruct { |
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[a08ba92] | 23 | MLEMutator::~MLEMutator() { |
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| 24 | delete targetTable; |
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| 25 | targetTable = 0; |
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| 26 | } |
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| 27 | |
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| 28 | CompoundStmt* MLEMutator::mutate( CompoundStmt *cmpndStmt ) { |
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| 29 | bool labeledBlock = false; |
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[be5aa1b] | 30 | if ( !(cmpndStmt->get_labels().empty()) ) { |
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[a08ba92] | 31 | labeledBlock = true; |
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| 32 | enclosingBlocks.push_back( Entry( cmpndStmt ) ); |
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| 33 | } // if |
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| 34 | |
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| 35 | std::list< Statement * > &kids = cmpndStmt->get_kids(); |
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| 36 | for ( std::list< Statement * >::iterator k = kids.begin(); k != kids.end(); k++ ) { |
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| 37 | *k = (*k)->acceptMutator(*this); |
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| 38 | |
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| 39 | if ( ! get_breakLabel().empty() ) { |
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| 40 | std::list< Statement * >::iterator next = k; next++; |
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| 41 | if ( next == kids.end() ) { |
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| 42 | std::list<Label> ls; ls.push_back( get_breakLabel() ); |
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| 43 | kids.push_back( new NullStmt( ls ) ); |
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[be5aa1b] | 44 | } else { |
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[a08ba92] | 45 | (*next)->get_labels().push_back( get_breakLabel() ); |
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[be5aa1b] | 46 | } |
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[a08ba92] | 47 | |
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| 48 | set_breakLabel(""); |
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| 49 | } // if |
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| 50 | } // for |
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| 51 | |
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| 52 | if ( labeledBlock ) { |
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| 53 | assert( ! enclosingBlocks.empty() ); |
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[be5aa1b] | 54 | if ( ! enclosingBlocks.back().get_breakExit().empty() ) { |
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[a08ba92] | 55 | set_breakLabel( enclosingBlocks.back().get_breakExit() ); |
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[be5aa1b] | 56 | } |
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[a08ba92] | 57 | enclosingBlocks.pop_back(); |
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| 58 | } // if |
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| 59 | |
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| 60 | //mutateAll( cmpndStmt->get_kids(), *this ); |
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| 61 | return cmpndStmt; |
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| 62 | } |
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| 63 | |
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| 64 | Statement *MLEMutator::mutate( WhileStmt *whileStmt ) { |
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| 65 | enclosingLoops.push_back( Entry( whileStmt ) ); |
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| 66 | whileStmt->set_body ( whileStmt->get_body()->acceptMutator( *this ) ); |
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| 67 | |
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| 68 | Entry &e = enclosingLoops.back(); |
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| 69 | assert ( e == whileStmt ); |
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| 70 | whileStmt->set_body( mutateLoop( whileStmt->get_body(), e ) ); |
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| 71 | enclosingLoops.pop_back(); |
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| 72 | |
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| 73 | return whileStmt; |
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[d9a0e76] | 74 | } |
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| 75 | |
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[a08ba92] | 76 | Statement *MLEMutator::mutate( ForStmt *forStmt ) { |
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| 77 | enclosingLoops.push_back( Entry( forStmt ) ); |
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| 78 | maybeMutate( forStmt->get_body(), *this ); |
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| 79 | |
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| 80 | Entry &e = enclosingLoops.back(); |
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| 81 | assert ( e == forStmt ); |
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| 82 | forStmt->set_body( mutateLoop( forStmt->get_body(), e ) ); |
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| 83 | enclosingLoops.pop_back(); |
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| 84 | |
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| 85 | return forStmt; |
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[d9a0e76] | 86 | } |
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[a08ba92] | 87 | |
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| 88 | Statement *MLEMutator::mutate( BranchStmt *branchStmt ) throw ( SemanticError ) { |
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[be5aa1b] | 89 | std::string originalTarget = branchStmt->get_originalTarget(); |
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| 90 | |
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[a08ba92] | 91 | if ( branchStmt->get_type() == BranchStmt::Goto ) |
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| 92 | return branchStmt; |
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| 93 | |
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| 94 | // test if continue target is a loop |
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[be5aa1b] | 95 | if ( branchStmt->get_type() == BranchStmt::Continue) { |
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| 96 | if ( enclosingLoops.empty() ) { |
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| 97 | throw SemanticError( "'continue' outside a loop" ); |
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| 98 | } else if ( std::find( enclosingLoops.begin(), enclosingLoops.end(), (*targetTable)[branchStmt->get_target()] ) == enclosingLoops.end() ) { |
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| 99 | throw SemanticError( "'continue' target label must be an enclosing loop: " + originalTarget ); |
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| 100 | } |
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| 101 | } |
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[a08ba92] | 102 | |
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| 103 | if ( branchStmt->get_type() == BranchStmt::Break && (enclosingLoops.empty() && enclosingSwitches.empty() && enclosingBlocks.empty() ) ) |
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| 104 | throw SemanticError( "'break' outside a loop or switch" ); |
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| 105 | |
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| 106 | if ( branchStmt->get_target() == "" ) return branchStmt; |
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| 107 | |
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| 108 | if ( targetTable->find( branchStmt->get_target() ) == targetTable->end() ) |
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[be5aa1b] | 109 | throw SemanticError("The label defined in the exit loop statement does not exist: " + originalTarget ); // shouldn't happen (since that's already checked) |
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[a08ba92] | 110 | |
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| 111 | std::list< Entry >::iterator check; |
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| 112 | if ( ( check = std::find( enclosingLoops.begin(), enclosingLoops.end(), (*targetTable)[branchStmt->get_target()] ) ) == enclosingLoops.end() ) |
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| 113 | // not in loop, checking if in block |
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| 114 | if ( (check = std::find( enclosingBlocks.begin(), enclosingBlocks.end(), (*targetTable)[branchStmt->get_target()] )) == enclosingBlocks.end() ) |
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| 115 | // neither in loop nor in block, checking if in switch/choose |
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| 116 | if ( (check = std::find( enclosingSwitches.begin(), enclosingSwitches.end(), (*targetTable)[branchStmt->get_target()] )) == enclosingSwitches.end() ) |
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[be5aa1b] | 117 | throw SemanticError("The target specified in the exit loop statement does not correspond to an enclosing control structure: " + originalTarget ); |
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[a08ba92] | 118 | |
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| 119 | if ( enclosingLoops.back() == (*check) ) |
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| 120 | return branchStmt; // exit the innermost loop (labels unnecessary) |
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| 121 | |
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| 122 | Label newLabel; |
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| 123 | switch ( branchStmt->get_type() ) { |
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| 124 | case BranchStmt::Break: |
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[be5aa1b] | 125 | if ( check->get_breakExit() != "" ) { |
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| 126 | newLabel = check->get_breakExit(); |
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| 127 | } else { |
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| 128 | newLabel = generator->newLabel(); |
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| 129 | check->set_breakExit( newLabel ); |
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| 130 | } // if |
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| 131 | break; |
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[a08ba92] | 132 | case BranchStmt::Continue: |
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[be5aa1b] | 133 | if ( check->get_contExit() != "" ) { |
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| 134 | newLabel = check->get_contExit(); |
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| 135 | } else { |
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| 136 | newLabel = generator->newLabel(); |
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| 137 | check->set_contExit( newLabel ); |
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| 138 | } // if |
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| 139 | break; |
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[a08ba92] | 140 | default: |
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[be5aa1b] | 141 | return 0; // shouldn't be here |
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[a08ba92] | 142 | } // switch |
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| 143 | |
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| 144 | return new BranchStmt( std::list<Label>(), newLabel, BranchStmt::Goto ); |
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| 145 | } |
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| 146 | |
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[be5aa1b] | 147 | template< typename SwitchClass > |
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| 148 | Statement *handleSwitchStmt( SwitchClass *switchStmt, MLEMutator &mutator ) { |
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| 149 | // set up some aliases so that the rest of the code isn't messy |
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| 150 | typedef MLEMutator::Entry Entry; |
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| 151 | LabelGenerator *generator = mutator.generator; |
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| 152 | std::list< Entry > &enclosingSwitches = mutator.enclosingSwitches; |
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[a08ba92] | 153 | |
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| 154 | Label brkLabel = generator->newLabel(); |
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| 155 | enclosingSwitches.push_back( Entry(switchStmt, "", brkLabel) ); |
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[be5aa1b] | 156 | mutateAll( switchStmt->get_branches(), mutator ); { |
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[a08ba92] | 157 | // check if this is necessary (if there is a break to this point, otherwise do not generate |
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| 158 | std::list<Label> temp; temp.push_back( brkLabel ); |
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| 159 | switchStmt->get_branches().push_back( new BranchStmt( temp, Label(""), BranchStmt::Break ) ); |
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| 160 | } |
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| 161 | assert ( enclosingSwitches.back() == switchStmt ); |
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| 162 | enclosingSwitches.pop_back(); |
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| 163 | return switchStmt; |
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| 164 | } |
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| 165 | |
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[be5aa1b] | 166 | Statement *MLEMutator::mutate( SwitchStmt *switchStmt ) { |
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| 167 | return handleSwitchStmt( switchStmt, *this ); |
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| 168 | } |
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| 169 | |
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[a08ba92] | 170 | Statement *MLEMutator::mutate( ChooseStmt *switchStmt ) { |
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[be5aa1b] | 171 | return handleSwitchStmt( switchStmt, *this ); |
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[a08ba92] | 172 | } |
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| 173 | |
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| 174 | Statement *MLEMutator::mutateLoop( Statement *bodyLoop, Entry &e ) { |
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| 175 | CompoundStmt *newBody; |
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| 176 | if ( ! (newBody = dynamic_cast<CompoundStmt *>( bodyLoop )) ) { |
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| 177 | newBody = new CompoundStmt( std::list< Label >() ); |
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| 178 | newBody->get_kids().push_back( bodyLoop ); |
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| 179 | } // if |
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| 180 | |
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| 181 | Label endLabel = e.get_contExit(); |
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| 182 | |
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| 183 | if ( e.get_breakExit() != "" ) { |
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| 184 | if ( endLabel == "" ) endLabel = generator->newLabel(); |
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| 185 | // check for whether this label is used or not, so as to not generate extraneous gotos |
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| 186 | if (e.breakExitUsed) |
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| 187 | newBody->get_kids().push_back( new BranchStmt( std::list< Label >(), endLabel, BranchStmt::Goto ) ); |
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| 188 | // xxx |
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| 189 | //std::list< Label > ls; ls.push_back( e.get_breakExit() ); |
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| 190 | set_breakLabel( e.get_breakExit() ); |
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| 191 | //newBody->get_kids().push_back( new BranchStmt( ls, "", BranchStmt::Break ) ); |
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| 192 | } // if |
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| 193 | |
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| 194 | if ( e.get_breakExit() != "" || e.get_contExit() != "" ) { |
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| 195 | if (dynamic_cast< NullStmt *>( newBody->get_kids().back() )) |
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| 196 | newBody->get_kids().back()->get_labels().push_back( endLabel ); |
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| 197 | else { |
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| 198 | std::list < Label > ls; ls.push_back( endLabel ); |
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| 199 | newBody->get_kids().push_back( new NullStmt( ls ) ); |
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| 200 | } // if |
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| 201 | } // if |
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| 202 | |
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| 203 | return newBody; |
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| 204 | } |
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| 205 | |
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| 206 | //*** Entry's methods |
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| 207 | void MLEMutator::Entry::set_contExit( Label l ) { |
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| 208 | assert ( contExit == "" || contExit == l ); |
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| 209 | contExit = l; |
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| 210 | } |
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| 211 | |
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| 212 | void MLEMutator::Entry::set_breakExit( Label l ) { |
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| 213 | assert ( breakExit == "" || breakExit == l ); |
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| 214 | breakExit = l; |
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[d9a0e76] | 215 | } |
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[51b7345] | 216 | } // namespace ControlStruct |
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[a08ba92] | 217 | |
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[51587aa] | 218 | // Local Variables: // |
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| 219 | // tab-width: 4 // |
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| 220 | // mode: c++ // |
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| 221 | // compile-command: "make install" // |
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| 222 | // End: // |
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