[51b7345] | 1 | #include <cassert> |
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| 2 | #include <algorithm> |
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| 3 | |
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| 4 | #include "MLEMutator.h" |
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| 5 | #include "SynTree/Statement.h" |
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| 6 | |
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| 7 | |
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| 8 | namespace ControlStruct { |
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[d9a0e76] | 9 | MLEMutator::~MLEMutator() { |
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| 10 | delete targetTable; |
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| 11 | targetTable = 0; |
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[51b7345] | 12 | } |
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| 13 | |
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[d9a0e76] | 14 | CompoundStmt* MLEMutator::mutate(CompoundStmt *cmpndStmt) { |
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| 15 | bool labeledBlock = false; |
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| 16 | if ( !((cmpndStmt->get_labels()).empty()) ) { |
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| 17 | labeledBlock = true; |
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| 18 | enclosingBlocks.push_back( Entry( cmpndStmt ) ); |
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| 19 | } |
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| 20 | |
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| 21 | std::list< Statement * > &kids = cmpndStmt->get_kids(); |
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| 22 | for ( std::list< Statement * >::iterator k = kids.begin(); k != kids.end(); k++ ) { |
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| 23 | *k = (*k)->acceptMutator(*this); |
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| 24 | |
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| 25 | if ( !get_breakLabel().empty() ) { |
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| 26 | std::list< Statement * >::iterator next = k; next++; |
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| 27 | if ( next == kids.end() ) { |
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| 28 | std::list<Label> ls; ls.push_back( get_breakLabel() ); |
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| 29 | kids.push_back( new NullStmt(ls) ); |
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| 30 | } else |
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| 31 | (*next)->get_labels().push_back( get_breakLabel() ); |
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| 32 | |
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| 33 | set_breakLabel(""); |
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| 34 | } // if |
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| 35 | } // for |
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| 36 | |
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| 37 | if ( labeledBlock ) { |
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| 38 | assert( ! enclosingBlocks.empty() ); |
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| 39 | if ( ! enclosingBlocks.back().get_breakExit().empty() ) |
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| 40 | set_breakLabel( enclosingBlocks.back().get_breakExit() ); |
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| 41 | enclosingBlocks.pop_back(); |
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| 42 | } // if |
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| 43 | |
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| 44 | //mutateAll( cmpndStmt->get_kids(), *this ); |
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| 45 | return cmpndStmt; |
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[51b7345] | 46 | } |
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| 47 | |
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[d9a0e76] | 48 | Statement *MLEMutator::mutate( WhileStmt *whileStmt ) { |
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| 49 | enclosingLoops.push_back( Entry( whileStmt ) ); |
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| 50 | whileStmt->set_body ( whileStmt->get_body()->acceptMutator( *this ) ); |
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[51b7345] | 51 | |
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[d9a0e76] | 52 | Entry &e = enclosingLoops.back(); |
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| 53 | assert ( e == whileStmt ); |
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| 54 | whileStmt->set_body( mutateLoop( whileStmt->get_body(), e ) ); |
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| 55 | enclosingLoops.pop_back(); |
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| 56 | |
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| 57 | return whileStmt; |
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[51b7345] | 58 | } |
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| 59 | |
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[d9a0e76] | 60 | Statement *MLEMutator::mutate( ForStmt *forStmt ) { |
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| 61 | enclosingLoops.push_back( Entry( forStmt ) ); |
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| 62 | maybeMutate( forStmt->get_body(), *this ); |
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[51b7345] | 63 | |
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[d9a0e76] | 64 | Entry &e = enclosingLoops.back(); |
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| 65 | assert ( e == forStmt ); |
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| 66 | forStmt->set_body( mutateLoop( forStmt->get_body(), e ) ); |
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| 67 | enclosingLoops.pop_back(); |
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[51b7345] | 68 | |
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[d9a0e76] | 69 | return forStmt; |
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[51b7345] | 70 | } |
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| 71 | |
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[d9a0e76] | 72 | Statement *MLEMutator::mutate( BranchStmt *branchStmt ) throw ( SemanticError ) { |
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| 73 | if ( branchStmt->get_type() == BranchStmt::Goto ) |
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| 74 | return branchStmt; |
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| 75 | |
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| 76 | // test if continue target is a loop |
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| 77 | if ( branchStmt->get_type() == BranchStmt::Continue && enclosingLoops.empty() ) |
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| 78 | throw SemanticError( "'continue' outside a loop" ); |
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| 79 | |
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| 80 | if ( branchStmt->get_type() == BranchStmt::Break && (enclosingLoops.empty() && enclosingSwitches.empty() && enclosingBlocks.empty() ) ) |
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| 81 | throw SemanticError( "'break' outside a loop or switch" ); |
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| 82 | |
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| 83 | if ( branchStmt->get_target() == "" ) return branchStmt; |
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| 84 | |
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| 85 | if ( targetTable->find( branchStmt->get_target() ) == targetTable->end() ) |
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| 86 | throw SemanticError("The label defined in the exit loop statement does not exist." ); // shouldn't happen (since that's already checked) |
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| 87 | |
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| 88 | std::list< Entry >::iterator check; |
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| 89 | if ( ( check = std::find( enclosingLoops.begin(), enclosingLoops.end(), (*targetTable)[branchStmt->get_target()] ) ) == enclosingLoops.end() ) |
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| 90 | // not in loop, checking if in switch/choose |
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| 91 | if ( (check = std::find( enclosingBlocks.begin(), enclosingBlocks.end(), (*targetTable)[branchStmt->get_target()] )) == enclosingBlocks.end() ) |
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| 92 | // neither in loop nor in block, checking if in switch/choose |
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| 93 | if ( (check = std::find( enclosingSwitches.begin(), enclosingSwitches.end(), (*targetTable)[branchStmt->get_target()] )) == enclosingSwitches.end() ) |
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| 94 | throw SemanticError("The target specified in the exit loop statement does not correspond to an enclosing loop."); |
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| 95 | |
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| 96 | if ( enclosingLoops.back() == (*check) ) |
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| 97 | return branchStmt; // exit the innermost loop (labels not necessary) |
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| 98 | |
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| 99 | Label newLabel; |
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| 100 | switch( branchStmt->get_type() ) { |
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| 101 | case BranchStmt::Break: |
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| 102 | if ( check->get_breakExit() != "" ) |
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| 103 | newLabel = check->get_breakExit(); |
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| 104 | else { newLabel = generator->newLabel(); check->set_breakExit( newLabel ); } |
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| 105 | break; |
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| 106 | case BranchStmt::Continue: |
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| 107 | if ( check->get_contExit() != "" ) |
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| 108 | newLabel = check->get_contExit(); |
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| 109 | else { newLabel = generator->newLabel(); check->set_contExit( newLabel ); } |
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| 110 | break; |
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| 111 | default: |
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| 112 | // shouldn't be here |
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| 113 | return 0; |
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| 114 | } // switch |
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| 115 | |
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| 116 | return new BranchStmt(std::list<Label>(), newLabel, BranchStmt::Goto ); |
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[51b7345] | 117 | } |
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| 118 | |
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[d9a0e76] | 119 | |
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| 120 | Statement *MLEMutator::mutate(SwitchStmt *switchStmt) { |
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| 121 | Label brkLabel = generator->newLabel(); |
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| 122 | enclosingSwitches.push_back( Entry(switchStmt, "", brkLabel) ); |
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| 123 | mutateAll( switchStmt->get_branches(), *this ); { |
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| 124 | // check if this is necessary (if there is a break to this point, otherwise do not generate |
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| 125 | std::list<Label> temp; temp.push_back( brkLabel ); |
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| 126 | switchStmt->get_branches().push_back( new BranchStmt( temp, Label(""), BranchStmt::Break ) ); |
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| 127 | } |
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| 128 | assert ( enclosingSwitches.back() == switchStmt ); |
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| 129 | enclosingSwitches.pop_back(); |
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| 130 | return switchStmt; |
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[51b7345] | 131 | } |
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| 132 | |
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[d9a0e76] | 133 | Statement *MLEMutator::mutate(ChooseStmt *switchStmt) { |
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| 134 | Label brkLabel = generator->newLabel(); |
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| 135 | enclosingSwitches.push_back( Entry(switchStmt,"", brkLabel) ); |
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| 136 | mutateAll( switchStmt->get_branches(), *this ); { |
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| 137 | // check if this is necessary (if there is a break to this point, otherwise do not generate |
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| 138 | std::list<Label> temp; temp.push_back( brkLabel ); |
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| 139 | switchStmt->get_branches().push_back( new BranchStmt( temp, Label(""), BranchStmt::Break ) ); |
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| 140 | } |
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| 141 | assert ( enclosingSwitches.back() == switchStmt ); |
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| 142 | enclosingSwitches.pop_back(); |
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| 143 | return switchStmt; |
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| 144 | } |
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[51b7345] | 145 | |
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[d9a0e76] | 146 | Statement *MLEMutator::mutateLoop( Statement *bodyLoop, Entry &e ) { |
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| 147 | CompoundStmt *newBody; |
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| 148 | if ( ! (newBody = dynamic_cast<CompoundStmt *>( bodyLoop )) ) { |
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| 149 | newBody = new CompoundStmt( std::list< Label >() ); |
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| 150 | newBody->get_kids().push_back( bodyLoop ); |
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| 151 | } // if |
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| 152 | |
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| 153 | Label endLabel = e.get_contExit(); |
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| 154 | |
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| 155 | if ( e.get_breakExit() != "" ) { |
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| 156 | if ( endLabel == "" ) endLabel = generator->newLabel(); |
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| 157 | // check for whether this label is used or not, so as to not generate extraneous gotos |
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| 158 | if (e.breakExitUsed) |
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| 159 | newBody->get_kids().push_back( new BranchStmt( std::list< Label >(), endLabel, BranchStmt::Goto ) ); |
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| 160 | // xxx |
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| 161 | //std::list< Label > ls; ls.push_back( e.get_breakExit() ); |
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| 162 | set_breakLabel( e.get_breakExit() ); |
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| 163 | //newBody->get_kids().push_back( new BranchStmt( ls, "", BranchStmt::Break ) ); |
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| 164 | } // if |
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| 165 | |
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| 166 | if ( e.get_breakExit() != "" || e.get_contExit() != "" ){ |
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| 167 | if (dynamic_cast< NullStmt *>( newBody->get_kids().back() )) |
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| 168 | newBody->get_kids().back()->get_labels().push_back( endLabel ); |
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| 169 | else { |
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| 170 | std::list < Label > ls; ls.push_back( endLabel ); |
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| 171 | newBody->get_kids().push_back( new NullStmt( ls ) ); |
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| 172 | } // if |
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| 173 | } // if |
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| 174 | |
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| 175 | return newBody; |
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| 176 | } |
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[51b7345] | 177 | |
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[d9a0e76] | 178 | //*** Entry's methods |
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| 179 | void MLEMutator::Entry::set_contExit( Label l ) { |
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| 180 | assert ( contExit == "" || contExit == l ); |
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| 181 | contExit = l; |
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| 182 | } |
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[51b7345] | 183 | |
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[d9a0e76] | 184 | void MLEMutator::Entry::set_breakExit( Label l ) { |
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| 185 | assert ( breakExit == "" || breakExit == l ); |
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| 186 | breakExit = l; |
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| 187 | } |
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[51b7345] | 188 | } // namespace ControlStruct |
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