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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7 | // RemoveInit.cc -- |
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8 | // |
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9 | // Author : Rob Schluntz |
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10 | // Created On : Mon May 18 07:44:20 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Tue Dec 15 15:37:26 2015 |
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13 | // Update Count : 15 |
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14 | // |
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15 | |
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16 | #include "RemoveInit.h" |
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17 | #include "SynTree/Declaration.h" |
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18 | #include "SynTree/Type.h" |
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19 | #include "SynTree/Expression.h" |
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20 | #include "SynTree/Statement.h" |
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21 | #include "SynTree/Initializer.h" |
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22 | #include "SynTree/Mutator.h" |
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23 | |
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24 | namespace InitTweak { |
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25 | namespace { |
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26 | const std::list<Label> noLabels; |
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27 | } |
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28 | |
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29 | class RemoveInit : public Mutator { |
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30 | public: |
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31 | RemoveInit(); |
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32 | virtual ObjectDecl * mutate(ObjectDecl *objDecl); |
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33 | virtual DeclarationWithType * mutate( FunctionDecl *functionDecl ); |
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34 | |
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35 | virtual Statement * mutate( ReturnStmt * returnStmt ); |
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36 | |
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37 | virtual CompoundStmt * mutate(CompoundStmt * compoundStmt); |
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38 | |
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39 | protected: |
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40 | std::list< Statement* > stmtsToAddBefore; |
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41 | std::list< Statement* > stmtsToAddAfter; |
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42 | void mutateStatementList( std::list< Statement* > &statements ); |
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43 | |
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44 | std::list<DeclarationWithType*> returnVals; |
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45 | UniqueName tempNamer; |
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46 | std::string funcName; |
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47 | }; |
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48 | |
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49 | void tweak( std::list< Declaration * > translationUnit ) { |
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50 | RemoveInit remover; |
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51 | mutateAll( translationUnit, remover ); |
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52 | } |
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53 | |
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54 | RemoveInit::RemoveInit() : tempNamer( "_retVal" ) {} |
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55 | |
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56 | void RemoveInit::mutateStatementList( std::list< Statement* > &statements ) { |
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57 | for ( std::list< Statement* >::iterator i = statements.begin(); i != statements.end(); ++i ) { |
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58 | if ( ! stmtsToAddAfter.empty() ) { |
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59 | statements.splice( i, stmtsToAddAfter ); |
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60 | } // if |
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61 | *i = (*i)->acceptMutator( *this ); |
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62 | if ( ! stmtsToAddBefore.empty() ) { |
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63 | statements.splice( i, stmtsToAddBefore ); |
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64 | } // if |
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65 | } // for |
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66 | if ( ! stmtsToAddAfter.empty() ) { |
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67 | statements.splice( statements.end(), stmtsToAddAfter ); |
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68 | } // if |
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69 | } |
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70 | |
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71 | CompoundStmt *RemoveInit::mutate(CompoundStmt *compoundStmt) { |
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72 | mutateStatementList( compoundStmt->get_kids() ); |
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73 | return compoundStmt; |
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74 | } |
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75 | |
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76 | // in the case where an object has an initializer and a polymorphic type, insert an assignment immediately after the |
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77 | // declaration. This will (seemingly) cause the later phases to do the right thing with the assignment |
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78 | ObjectDecl *RemoveInit::mutate( ObjectDecl *objDecl ) { |
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79 | if (objDecl->get_init() && dynamic_cast<TypeInstType*>(objDecl->get_type())) { |
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80 | if (SingleInit * single = dynamic_cast<SingleInit*>(objDecl->get_init())) { |
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81 | UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
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82 | assign->get_args().push_back( new AddressExpr (new NameExpr( objDecl->get_name() ) ) ); |
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83 | assign->get_args().push_back( single->get_value()->clone() ); |
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84 | stmtsToAddAfter.push_back(new ExprStmt(noLabels, assign)); |
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85 | } // if |
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86 | } // if |
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87 | return objDecl; |
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88 | } |
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89 | |
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90 | Statement *RemoveInit::mutate( ReturnStmt *returnStmt ) { |
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91 | // update for multiple return values |
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92 | assert( returnVals.size() == 0 || returnVals.size() == 1 ); |
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93 | // hands off if the function returns an lvalue - we don't want to allocate a temporary if a variable's address |
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94 | // is being returned |
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95 | if ( returnStmt->get_expr() && returnVals.size() == 1 && funcName != "?=?" && ! returnVals.front()->get_type()->get_isLvalue() ) { |
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96 | ObjectDecl *newObj = new ObjectDecl( tempNamer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::C, 0, returnVals.front()->get_type()->clone(), 0 ); |
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97 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, newObj ) ); |
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98 | |
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99 | UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
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100 | assign->get_args().push_back( new AddressExpr (new NameExpr( newObj->get_name() ) ) ); |
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101 | assign->get_args().push_back( returnStmt->get_expr() ); |
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102 | stmtsToAddBefore.push_back(new ExprStmt(noLabels, assign)); |
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103 | |
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104 | returnStmt->set_expr( new VariableExpr( newObj ) ); |
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105 | } // if |
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106 | return returnStmt; |
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107 | } |
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108 | |
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109 | DeclarationWithType* RemoveInit::mutate( FunctionDecl *functionDecl ) { |
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110 | std::list<DeclarationWithType*> oldReturnVals = returnVals; |
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111 | std::string oldFuncName = funcName; |
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112 | |
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113 | FunctionType * type = functionDecl->get_functionType(); |
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114 | returnVals = type->get_returnVals(); |
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115 | funcName = functionDecl->get_name(); |
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116 | DeclarationWithType * decl = Mutator::mutate( functionDecl ); |
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117 | returnVals = oldReturnVals; |
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118 | funcName = oldFuncName; |
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119 | return decl; |
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120 | } |
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121 | } // namespace InitTweak |
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122 | |
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123 | // Local Variables: // |
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124 | // tab-width: 4 // |
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125 | // mode: c++ // |
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126 | // compile-command: "make install" // |
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127 | // End: // |
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