[71f4e4f] | 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 | // FixInit.h -- |
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| 8 | // |
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| 9 | // Author : Rob Schluntz |
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| 10 | // Created On : Wed Jan 13 16:29:30 2016 |
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[adcc065] | 11 | // Last Modified By : Peter A. Buhr |
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[d56e5bc] | 12 | // Last Modified On : Wed Jun 21 17:35:05 2017 |
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| 13 | // Update Count : 74 |
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[71f4e4f] | 14 | // |
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[be9288a] | 15 | #include "FixInit.h" |
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[71f4e4f] | 16 | |
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[d180746] | 17 | #include <stddef.h> // for NULL |
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| 18 | #include <algorithm> // for set_difference, copy_if |
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[e3e16bc] | 19 | #include <cassert> // for assert, strict_dynamic_cast |
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[d180746] | 20 | #include <iostream> // for operator<<, ostream, basic_ost... |
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| 21 | #include <iterator> // for insert_iterator, back_inserter |
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| 22 | #include <list> // for _List_iterator, list, list<>::... |
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| 23 | #include <map> // for _Rb_tree_iterator, _Rb_tree_co... |
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| 24 | #include <memory> // for allocator_traits<>::value_type |
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| 25 | #include <set> // for set, set<>::value_type |
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| 26 | #include <unordered_map> // for unordered_map, unordered_map<>... |
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| 27 | #include <unordered_set> // for unordered_set |
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| 28 | #include <utility> // for pair |
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[134322e] | 29 | |
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[d180746] | 30 | #include "CodeGen/GenType.h" // for genPrettyType |
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[bff227f] | 31 | #include "CodeGen/OperatorTable.h" |
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[d180746] | 32 | #include "Common/PassVisitor.h" // for PassVisitor, WithStmtsToAdd |
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| 33 | #include "Common/SemanticError.h" // for SemanticError |
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| 34 | #include "Common/UniqueName.h" // for UniqueName |
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| 35 | #include "Common/utility.h" // for CodeLocation, ValueGuard, toSt... |
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| 36 | #include "FixGlobalInit.h" // for fixGlobalInit |
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| 37 | #include "GenInit.h" // for genCtorDtor |
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| 38 | #include "GenPoly/GenPoly.h" // for getFunctionType |
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| 39 | #include "InitTweak.h" // for getFunctionName, getCallArg |
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| 40 | #include "Parser/LinkageSpec.h" // for C, Spec, Cforall, isBuiltin |
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| 41 | #include "ResolvExpr/Resolver.h" // for findVoidExpression |
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| 42 | #include "ResolvExpr/typeops.h" // for typesCompatible |
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| 43 | #include "SymTab/Autogen.h" // for genImplicitCall |
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| 44 | #include "SymTab/Indexer.h" // for Indexer |
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| 45 | #include "SymTab/Mangler.h" // for Mangler |
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| 46 | #include "SynTree/Attribute.h" // for Attribute |
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| 47 | #include "SynTree/Constant.h" // for Constant |
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| 48 | #include "SynTree/Declaration.h" // for ObjectDecl, FunctionDecl, Decl... |
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| 49 | #include "SynTree/Expression.h" // for UniqueExpr, VariableExpr, Unty... |
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| 50 | #include "SynTree/Initializer.h" // for ConstructorInit, SingleInit |
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[ba3706f] | 51 | #include "SynTree/Label.h" // for Label, operator< |
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[d180746] | 52 | #include "SynTree/Mutator.h" // for mutateAll, Mutator, maybeMutate |
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| 53 | #include "SynTree/Statement.h" // for ExprStmt, CompoundStmt, Branch... |
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| 54 | #include "SynTree/Type.h" // for Type, Type::StorageClasses |
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| 55 | #include "SynTree/TypeSubstitution.h" // for TypeSubstitution, operator<< |
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[1bc749f] | 56 | #include "SynTree/VarExprReplacer.h" // for VarExprReplacer |
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[d180746] | 57 | #include "SynTree/Visitor.h" // for acceptAll, maybeAccept |
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[71f4e4f] | 58 | |
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[f0121d7] | 59 | bool ctordtorp = false; // print all debug |
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| 60 | bool ctorp = false; // print ctor debug |
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| 61 | bool cpctorp = false; // print copy ctor debug |
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| 62 | bool dtorp = false; // print dtor debug |
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[845cedc] | 63 | #define PRINT( text ) if ( ctordtorp ) { text } |
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[c2931ea] | 64 | #define CP_CTOR_PRINT( text ) if ( ctordtorp || cpctorp ) { text } |
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| 65 | #define DTOR_PRINT( text ) if ( ctordtorp || dtorp ) { text } |
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[845cedc] | 66 | |
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[71f4e4f] | 67 | namespace InitTweak { |
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| 68 | namespace { |
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[597db97] | 69 | typedef std::unordered_map< int, int > UnqCount; |
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[31f379c] | 70 | |
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[c0714bf] | 71 | struct InsertImplicitCalls : public WithTypeSubstitution { |
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[adcc065] | 72 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes so that it is easy to identify which |
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| 73 | /// function calls need their parameters to be copy constructed |
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[c0714bf] | 74 | static void insert( std::list< Declaration * > & translationUnit ); |
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[134322e] | 75 | |
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| 76 | Expression * postmutate( ApplicationExpr * appExpr ); |
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[c2931ea] | 77 | }; |
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| 78 | |
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[c0714bf] | 79 | struct ResolveCopyCtors final : public WithIndexer, public WithShortCircuiting, public WithTypeSubstitution { |
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[adcc065] | 80 | /// generate temporary ObjectDecls for each argument and return value of each ImplicitCopyCtorExpr, |
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| 81 | /// generate/resolve copy construction expressions for each, and generate/resolve destructors for both |
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| 82 | /// arguments and return value temporaries |
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[c0714bf] | 83 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit, UnqCount & unqCount ); |
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[c2931ea] | 84 | |
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[c0714bf] | 85 | ResolveCopyCtors( UnqCount & unqCount ) : unqCount( unqCount ) {} |
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[31f379c] | 86 | |
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[c0714bf] | 87 | void postvisit( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 88 | void postvisit( StmtExpr * stmtExpr ); |
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| 89 | void previsit( UniqueExpr * unqExpr ); |
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| 90 | void postvisit( UniqueExpr * unqExpr ); |
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[c2931ea] | 91 | |
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| 92 | /// create and resolve ctor/dtor expression: fname(var, [cpArg]) |
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[65660bd] | 93 | Expression * makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg = NULL ); |
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[c2931ea] | 94 | /// true if type does not need to be copy constructed to ensure correctness |
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[1132b62] | 95 | bool skipCopyConstruct( Type * type ); |
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[ae1b9ea] | 96 | void copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ); |
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[092528b] | 97 | void destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr ); |
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[31f379c] | 98 | |
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[597db97] | 99 | UnqCount & unqCount; // count the number of times each unique expr ID appears |
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[c0714bf] | 100 | std::unordered_set< int > vars; |
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[c2931ea] | 101 | }; |
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| 102 | |
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| 103 | /// collects constructed object decls - used as a base class |
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[698ec72] | 104 | struct ObjDeclCollector : public WithGuards, public WithShortCircuiting { |
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[62423350] | 105 | // use ordered data structure to maintain ordering for set_difference and for consistent error messages |
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| 106 | typedef std::list< ObjectDecl * > ObjectSet; |
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[698ec72] | 107 | void previsit( CompoundStmt *compoundStmt ); |
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| 108 | void previsit( DeclStmt *stmt ); |
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[52c14b3] | 109 | |
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| 110 | // don't go into other functions |
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[698ec72] | 111 | void previsit( FunctionDecl * ) { visit_children = false; } |
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[52c14b3] | 112 | |
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[c2931ea] | 113 | protected: |
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| 114 | ObjectSet curVars; |
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| 115 | }; |
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| 116 | |
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[6cf27a07] | 117 | // debug |
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[62423350] | 118 | template<typename ObjectSet> |
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| 119 | struct PrintSet { |
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| 120 | PrintSet( const ObjectSet & objs ) : objs( objs ) {} |
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[c2931ea] | 121 | const ObjectSet & objs; |
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| 122 | }; |
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[62423350] | 123 | template<typename ObjectSet> |
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| 124 | PrintSet<ObjectSet> printSet( const ObjectSet & objs ) { return PrintSet<ObjectSet>( objs ); } |
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| 125 | template<typename ObjectSet> |
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| 126 | std::ostream & operator<<( std::ostream & out, const PrintSet<ObjectSet> & set) { |
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[c2931ea] | 127 | out << "{ "; |
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| 128 | for ( ObjectDecl * obj : set.objs ) { |
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| 129 | out << obj->get_name() << ", " ; |
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[adcc065] | 130 | } // for |
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[c2931ea] | 131 | out << " }"; |
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| 132 | return out; |
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| 133 | } |
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| 134 | |
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[698ec72] | 135 | struct LabelFinder final : public ObjDeclCollector { |
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[c2931ea] | 136 | typedef std::map< Label, ObjectSet > LabelMap; |
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| 137 | // map of Label -> live variables at that label |
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| 138 | LabelMap vars; |
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| 139 | |
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[698ec72] | 140 | typedef ObjDeclCollector Parent; |
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| 141 | using Parent::previsit; |
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| 142 | void previsit( Statement * stmt ); |
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| 143 | |
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| 144 | void previsit( CompoundStmt *compoundStmt ); |
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| 145 | void previsit( DeclStmt *stmt ); |
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[c2931ea] | 146 | }; |
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| 147 | |
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[698ec72] | 148 | struct InsertDtors final : public ObjDeclCollector, public WithStmtsToAdd { |
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[adcc065] | 149 | /// insert destructor calls at the appropriate places. must happen before CtorInit nodes are removed |
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| 150 | /// (currently by FixInit) |
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[c2931ea] | 151 | static void insert( std::list< Declaration * > & translationUnit ); |
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| 152 | |
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| 153 | typedef std::list< ObjectDecl * > OrderedDecls; |
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| 154 | typedef std::list< OrderedDecls > OrderedDeclsStack; |
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| 155 | |
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[698ec72] | 156 | InsertDtors( PassVisitor<LabelFinder> & finder ) : finder( finder ), labelVars( finder.pass.vars ) {} |
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[c2931ea] | 157 | |
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[698ec72] | 158 | typedef ObjDeclCollector Parent; |
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| 159 | using Parent::previsit; |
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[62e5546] | 160 | |
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[698ec72] | 161 | void previsit( FunctionDecl * funcDecl ); |
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[c2931ea] | 162 | |
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[698ec72] | 163 | void previsit( BranchStmt * stmt ); |
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[c2931ea] | 164 | private: |
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| 165 | void handleGoto( BranchStmt * stmt ); |
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| 166 | |
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[698ec72] | 167 | PassVisitor<LabelFinder> & finder; |
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[c2931ea] | 168 | LabelFinder::LabelMap & labelVars; |
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| 169 | OrderedDeclsStack reverseDeclOrder; |
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| 170 | }; |
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| 171 | |
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[0508ab3] | 172 | class FixInit : public WithStmtsToAdd { |
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[c2931ea] | 173 | public: |
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| 174 | /// expand each object declaration to use its constructor after it is declared. |
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| 175 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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| 176 | |
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[aff3af4] | 177 | DeclarationWithType * postmutate( ObjectDecl *objDecl ); |
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[72e9222] | 178 | |
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| 179 | std::list< Declaration * > staticDtorDecls; |
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[c2931ea] | 180 | }; |
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| 181 | |
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[dc2334c] | 182 | class FixCopyCtors final : public WithStmtsToAdd, public WithShortCircuiting, public WithVisitorRef<FixCopyCtors> { |
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[c2931ea] | 183 | public: |
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[597db97] | 184 | FixCopyCtors( UnqCount & unqCount ) : unqCount( unqCount ){} |
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[adcc065] | 185 | /// expand ImplicitCopyCtorExpr nodes into the temporary declarations, copy constructors, call expression, |
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| 186 | /// and destructors |
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[597db97] | 187 | static void fixCopyCtors( std::list< Declaration * > &translationUnit, UnqCount & unqCount ); |
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[c2931ea] | 188 | |
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[dc2334c] | 189 | Expression * postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 190 | void premutate( StmtExpr * stmtExpr ); |
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| 191 | void premutate( UniqueExpr * unqExpr ); |
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[597db97] | 192 | |
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| 193 | UnqCount & unqCount; |
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[c2931ea] | 194 | }; |
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[79970ed] | 195 | |
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[9a707e4e] | 196 | struct GenStructMemberCalls final : public WithGuards, public WithShortCircuiting, public WithIndexer { |
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[c8dfcd3] | 197 | /// generate default/copy ctor and dtor calls for user-defined struct ctor/dtors |
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| 198 | /// for any member that is missing a corresponding ctor/dtor call. |
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| 199 | /// error if a member is used before constructed |
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| 200 | static void generate( std::list< Declaration * > & translationUnit ); |
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[79970ed] | 201 | |
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[88e79ad] | 202 | void previsit( StructDecl * structDecl ); |
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| 203 | |
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[9a707e4e] | 204 | void previsit( FunctionDecl * funcDecl ); |
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| 205 | void postvisit( FunctionDecl * funcDecl ); |
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[79970ed] | 206 | |
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[9a707e4e] | 207 | void previsit( MemberExpr * memberExpr ); |
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| 208 | void previsit( ApplicationExpr * appExpr ); |
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[79970ed] | 209 | |
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[3906301] | 210 | SemanticError errors; |
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[79970ed] | 211 | private: |
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[3906301] | 212 | template< typename... Params > |
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[64ac636] | 213 | void emit( CodeLocation, const Params &... params ); |
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[79970ed] | 214 | |
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[b0f601fa] | 215 | FunctionDecl * function = nullptr; |
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[64ac636] | 216 | std::set< DeclarationWithType * > unhandled; |
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| 217 | std::map< DeclarationWithType *, CodeLocation > usedUninit; |
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[b0f601fa] | 218 | ObjectDecl * thisParam = nullptr; |
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[c8dfcd3] | 219 | bool isCtor = false; // true if current function is a constructor |
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[b0f601fa] | 220 | StructDecl * structDecl = nullptr; |
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[88e79ad] | 221 | |
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| 222 | // special built-in functions necessary for this to work |
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| 223 | StructDecl * dtorStruct = nullptr; |
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| 224 | FunctionDecl * dtorStructDestroy = nullptr; |
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[c8dfcd3] | 225 | }; |
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| 226 | |
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| 227 | // very simple resolver-like mutator class - used to |
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| 228 | // resolve UntypedExprs that are found within newly |
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| 229 | // generated constructor/destructor calls |
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[62e5546] | 230 | class MutatingResolver final : public Mutator { |
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[c8dfcd3] | 231 | public: |
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| 232 | MutatingResolver( SymTab::Indexer & indexer ) : indexer( indexer ) {} |
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| 233 | |
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[62e5546] | 234 | using Mutator::mutate; |
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| 235 | virtual DeclarationWithType* mutate( ObjectDecl *objectDecl ) override; |
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| 236 | virtual Expression* mutate( UntypedExpr *untypedExpr ) override; |
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[c8dfcd3] | 237 | |
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[62e5546] | 238 | private: |
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[c8dfcd3] | 239 | SymTab::Indexer & indexer; |
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[79970ed] | 240 | }; |
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[b6fe7e6] | 241 | |
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[696bf6e] | 242 | struct FixCtorExprs final : public WithDeclsToAdd, public WithIndexer { |
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[b6fe7e6] | 243 | /// expands ConstructorExpr nodes into comma expressions, using a temporary for the first argument |
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| 244 | static void fix( std::list< Declaration * > & translationUnit ); |
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| 245 | |
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[696bf6e] | 246 | Expression * postmutate( ConstructorExpr * ctorExpr ); |
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[b6fe7e6] | 247 | }; |
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[c2931ea] | 248 | } // namespace |
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[db4ecc5] | 249 | |
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[6cf27a07] | 250 | void fix( std::list< Declaration * > & translationUnit, const std::string & filename, bool inLibrary ) { |
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| 251 | // fixes ConstructorInit for global variables. should happen before fixInitializers. |
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| 252 | InitTweak::fixGlobalInit( translationUnit, filename, inLibrary ); |
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| 253 | |
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[597db97] | 254 | UnqCount unqCount; |
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[b6fe7e6] | 255 | |
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[c0714bf] | 256 | InsertImplicitCalls::insert( translationUnit ); |
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| 257 | ResolveCopyCtors::resolveImplicitCalls( translationUnit, unqCount ); |
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[c2931ea] | 258 | InsertDtors::insert( translationUnit ); |
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[71f4e4f] | 259 | FixInit::fixInitializers( translationUnit ); |
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[c2931ea] | 260 | |
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[db4ecc5] | 261 | // FixCopyCtors must happen after FixInit, so that destructors are placed correctly |
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[597db97] | 262 | FixCopyCtors::fixCopyCtors( translationUnit, unqCount ); |
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[79970ed] | 263 | |
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[c8dfcd3] | 264 | GenStructMemberCalls::generate( translationUnit ); |
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[ae1b9ea] | 265 | |
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[b6fe7e6] | 266 | // xxx - ctor expansion currently has to be after FixCopyCtors, because there is currently a |
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| 267 | // hack in the way untyped assignments are generated, where the first argument cannot have |
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| 268 | // its address taken because of the way codegeneration handles UntypedExpr vs. ApplicationExpr. |
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| 269 | // Thus such assignment exprs must never pushed through expression resolution (and thus should |
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| 270 | // not go through the FixCopyCtors pass), otherwise they will fail -- guaranteed. |
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| 271 | // Also needs to happen after GenStructMemberCalls, since otherwise member constructors exprs |
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| 272 | // don't look right, and a member can be constructed more than once. |
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| 273 | FixCtorExprs::fix( translationUnit ); |
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[db4ecc5] | 274 | } |
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| 275 | |
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[c2931ea] | 276 | namespace { |
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[c0714bf] | 277 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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| 278 | PassVisitor<InsertImplicitCalls> inserter; |
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[c2931ea] | 279 | mutateAll( translationUnit, inserter ); |
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| 280 | } |
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[db4ecc5] | 281 | |
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[c0714bf] | 282 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit, UnqCount & unqCount ) { |
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| 283 | PassVisitor<ResolveCopyCtors> resolver( unqCount ); |
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[c2931ea] | 284 | acceptAll( translationUnit, resolver ); |
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| 285 | } |
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[71f4e4f] | 286 | |
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[c2931ea] | 287 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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[aff3af4] | 288 | PassVisitor<FixInit> fixer; |
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[72e9222] | 289 | |
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| 290 | // can't use mutateAll, because need to insert declarations at top-level |
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| 291 | // can't use DeclMutator, because sometimes need to insert IfStmt, etc. |
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| 292 | SemanticError errors; |
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| 293 | for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
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| 294 | try { |
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[3c398b6] | 295 | maybeMutate( *i, fixer ); |
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[aff3af4] | 296 | translationUnit.splice( i, fixer.pass.staticDtorDecls ); |
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[72e9222] | 297 | } catch( SemanticError &e ) { |
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[138e29e] | 298 | e.set_location( (*i)->location ); |
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[72e9222] | 299 | errors.append( e ); |
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| 300 | } // try |
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| 301 | } // for |
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| 302 | if ( ! errors.isEmpty() ) { |
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| 303 | throw errors; |
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| 304 | } // if |
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[c2931ea] | 305 | } |
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[71f4e4f] | 306 | |
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[c2931ea] | 307 | void InsertDtors::insert( std::list< Declaration * > & translationUnit ) { |
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[698ec72] | 308 | PassVisitor<LabelFinder> finder; |
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| 309 | PassVisitor<InsertDtors> inserter( finder ); |
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[c2931ea] | 310 | acceptAll( translationUnit, inserter ); |
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| 311 | } |
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| 312 | |
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[597db97] | 313 | void FixCopyCtors::fixCopyCtors( std::list< Declaration * > & translationUnit, UnqCount & unqCount ) { |
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[dc2334c] | 314 | PassVisitor<FixCopyCtors> fixer( unqCount ); |
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[c2931ea] | 315 | mutateAll( translationUnit, fixer ); |
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| 316 | } |
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[db4ecc5] | 317 | |
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[c8dfcd3] | 318 | void GenStructMemberCalls::generate( std::list< Declaration * > & translationUnit ) { |
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[9a707e4e] | 319 | PassVisitor<GenStructMemberCalls> warner; |
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[c8dfcd3] | 320 | acceptAll( translationUnit, warner ); |
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[79970ed] | 321 | } |
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| 322 | |
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[b6fe7e6] | 323 | void FixCtorExprs::fix( std::list< Declaration * > & translationUnit ) { |
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[696bf6e] | 324 | PassVisitor<FixCtorExprs> fixer; |
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| 325 | mutateAll( translationUnit, fixer ); |
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[b6fe7e6] | 326 | } |
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| 327 | |
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[134322e] | 328 | Expression * InsertImplicitCalls::postmutate( ApplicationExpr * appExpr ) { |
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[c2931ea] | 329 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
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[be151bf] | 330 | if ( function->var->linkage.is_builtin ) { |
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[c2931ea] | 331 | // optimization: don't need to copy construct in order to call intrinsic functions |
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| 332 | return appExpr; |
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| 333 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
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| 334 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
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[05807e9] | 335 | assertf( ftype, "Function call without function type: %s", toString( funcDecl ).c_str() ); |
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[be151bf] | 336 | if ( CodeGen::isConstructor( funcDecl->get_name() ) && ftype->parameters.size() == 2 ) { |
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| 337 | Type * t1 = getPointerBase( ftype->parameters.front()->get_type() ); |
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| 338 | Type * t2 = ftype->parameters.back()->get_type(); |
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[0a81c3f] | 339 | assert( t1 ); |
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[c2931ea] | 340 | |
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[0a81c3f] | 341 | if ( ResolvExpr::typesCompatible( t1, t2, SymTab::Indexer() ) ) { |
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[a28bc02] | 342 | // optimization: don't need to copy construct in order to call a copy constructor |
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[c2931ea] | 343 | return appExpr; |
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[adcc065] | 344 | } // if |
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[bff227f] | 345 | } else if ( CodeGen::isDestructor( funcDecl->get_name() ) ) { |
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[c2931ea] | 346 | // correctness: never copy construct arguments to a destructor |
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[845cedc] | 347 | return appExpr; |
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[adcc065] | 348 | } // if |
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| 349 | } // if |
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| 350 | } // if |
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[c2931ea] | 351 | CP_CTOR_PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
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| 352 | |
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| 353 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
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| 354 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
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[c0714bf] | 355 | // Move the type substitution to the new top-level, if it is attached to the appExpr. |
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[c2931ea] | 356 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
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| 357 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
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[c0714bf] | 358 | // calls can be resolved. |
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[c2931ea] | 359 | assert( env ); |
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[c0714bf] | 360 | std::swap( expr->env, appExpr->env ); |
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[c2931ea] | 361 | return expr; |
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[db4ecc5] | 362 | } |
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| 363 | |
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[29bc63e] | 364 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { return ! isConstructable( type ); } |
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[c2931ea] | 365 | |
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[65660bd] | 366 | Expression * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
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[c2931ea] | 367 | assert( var ); |
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[092528b] | 368 | // arrays are not copy constructed, so this should always be an ExprStmt |
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| 369 | ImplicitCtorDtorStmt * stmt = genCtorDtor( fname, var, cpArg ); |
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[e3e16bc] | 370 | ExprStmt * exprStmt = strict_dynamic_cast< ExprStmt * >( stmt->get_callStmt() ); |
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[08da53d] | 371 | Expression * resolved = exprStmt->expr; |
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| 372 | exprStmt->expr = nullptr; // take ownership of expr |
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[c2931ea] | 373 | |
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| 374 | // resolve copy constructor |
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[adcc065] | 375 | // should only be one alternative for copy ctor and dtor expressions, since all arguments are fixed |
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| 376 | // (VariableExpr and already resolved expression) |
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[08da53d] | 377 | CP_CTOR_PRINT( std::cerr << "ResolvingCtorDtor " << resolved << std::endl; ) |
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| 378 | ResolvExpr::findVoidExpression( resolved, indexer ); |
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[65660bd] | 379 | assert( resolved ); |
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[c2931ea] | 380 | if ( resolved->get_env() ) { |
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[31f379c] | 381 | // Extract useful information and discard new environments. Keeping them causes problems in PolyMutator passes. |
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[c2931ea] | 382 | env->add( *resolved->get_env() ); |
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[31f379c] | 383 | delete resolved->get_env(); |
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| 384 | resolved->set_env( nullptr ); |
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[adcc065] | 385 | } // if |
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[092528b] | 386 | delete stmt; |
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[c2931ea] | 387 | return resolved; |
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[540de412] | 388 | } |
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[db4ecc5] | 389 | |
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[ae1b9ea] | 390 | void ResolveCopyCtors::copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ) { |
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[c2931ea] | 391 | static UniqueName tempNamer("_tmp_cp"); |
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[31f379c] | 392 | assert( env ); |
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| 393 | CP_CTOR_PRINT( std::cerr << "Type Substitution: " << *env << std::endl; ) |
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[d29fa5f] | 394 | assert( arg->result ); |
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[ae1b9ea] | 395 | Type * result = arg->result; |
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[1132b62] | 396 | if ( skipCopyConstruct( result ) ) return; // skip certain non-copyable types |
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| 397 | |
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[f5c3b6c] | 398 | // type may involve type variables, so apply type substitution to get temporary variable's actual type, |
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| 399 | // since result type may not be substituted (e.g., if the type does not appear in the parameter list) |
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[ae1b9ea] | 400 | // Use applyFree so that types bound in function pointers are not substituted, e.g. in forall(dtype T) void (*)(T). |
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| 401 | env->applyFree( result ); |
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[3aeaecd] | 402 | ObjectDecl * tmp = ObjectDecl::newObject( "__tmp", result, nullptr ); |
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[615a096] | 403 | tmp->get_type()->set_const( false ); |
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[1132b62] | 404 | |
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| 405 | // create and resolve copy constructor |
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| 406 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for an argument" << std::endl; ) |
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[65660bd] | 407 | Expression * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
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| 408 | |
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| 409 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( cpCtor ) ) { |
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| 410 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
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| 411 | // don't create the temporary and don't call the copy constructor |
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[ae1b9ea] | 412 | VariableExpr * function = strict_dynamic_cast< VariableExpr * >( appExpr->function ); |
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| 413 | if ( function->var->linkage == LinkageSpec::Intrinsic ) { |
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| 414 | // arguments that need to be boxed need a temporary regardless of whether the copy constructor is intrinsic, |
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| 415 | // so that the object isn't changed inside of the polymorphic function |
---|
| 416 | if ( ! GenPoly::needsBoxing( formal, result, impCpCtorExpr->callExpr, env ) ) return; |
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| 417 | } |
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[65660bd] | 418 | } |
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| 419 | |
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[3aeaecd] | 420 | // set a unique name for the temporary once it's certain the call is necessary |
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| 421 | tmp->name = tempNamer.newName(); |
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| 422 | |
---|
[65660bd] | 423 | // replace argument to function call with temporary |
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| 424 | arg = new CommaExpr( cpCtor, new VariableExpr( tmp ) ); |
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[ae1b9ea] | 425 | impCpCtorExpr->tempDecls.push_back( tmp ); |
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| 426 | impCpCtorExpr->dtors.push_front( makeCtorDtor( "^?{}", tmp ) ); |
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[1132b62] | 427 | } |
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[c2931ea] | 428 | |
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[092528b] | 429 | void ResolveCopyCtors::destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr ) { |
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| 430 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
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[1132b62] | 431 | } |
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| 432 | |
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[c0714bf] | 433 | void ResolveCopyCtors::postvisit( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
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[c2931ea] | 434 | CP_CTOR_PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
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| 435 | |
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[ae1b9ea] | 436 | ApplicationExpr * appExpr = impCpCtorExpr->callExpr; |
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[c2931ea] | 437 | |
---|
| 438 | // take each argument and attempt to copy construct it. |
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[ae1b9ea] | 439 | FunctionType * ftype = GenPoly::getFunctionType( appExpr->function->result ); |
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| 440 | assert( ftype ); |
---|
| 441 | auto & params = ftype->parameters; |
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| 442 | auto iter = params.begin(); |
---|
| 443 | for ( Expression * & arg : appExpr->args ) { |
---|
| 444 | Type * formal = nullptr; |
---|
| 445 | if ( iter != params.end() ) { |
---|
| 446 | DeclarationWithType * param = *iter++; |
---|
| 447 | formal = param->get_type(); |
---|
| 448 | } |
---|
| 449 | |
---|
| 450 | copyConstructArg( arg, impCpCtorExpr, formal ); |
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[adcc065] | 451 | } // for |
---|
[db4ecc5] | 452 | |
---|
[adcc065] | 453 | // each return value from the call needs to be connected with an ObjectDecl at the call site, which is |
---|
| 454 | // initialized with the return value and is destructed later |
---|
[31f379c] | 455 | // xxx - handle named return values? |
---|
[ae1b9ea] | 456 | Type * result = appExpr->result; |
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[906e24d] | 457 | if ( ! result->isVoid() ) { |
---|
[1132b62] | 458 | static UniqueName retNamer("_tmp_cp_ret"); |
---|
[c2931ea] | 459 | result = result->clone(); |
---|
[31f379c] | 460 | env->apply( result ); |
---|
[3aeaecd] | 461 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
[ae1b9ea] | 462 | ret->type->set_const( false ); |
---|
| 463 | impCpCtorExpr->returnDecls.push_back( ret ); |
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[c2931ea] | 464 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
---|
[0a81c3f] | 465 | if ( ! dynamic_cast< ReferenceType * >( result ) ) { |
---|
[3aeaecd] | 466 | // destructing reference returns is bad because it can cause multiple destructor calls to the same object - the returned object is not a temporary |
---|
[092528b] | 467 | destructRet( ret, impCpCtorExpr ); |
---|
[dc86541] | 468 | } |
---|
[adcc065] | 469 | } // for |
---|
[c2931ea] | 470 | CP_CTOR_PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
---|
[db4ecc5] | 471 | } |
---|
| 472 | |
---|
[c0714bf] | 473 | void ResolveCopyCtors::postvisit( StmtExpr * stmtExpr ) { |
---|
| 474 | assert( env ); |
---|
[31f379c] | 475 | assert( stmtExpr->get_result() ); |
---|
| 476 | Type * result = stmtExpr->get_result(); |
---|
| 477 | if ( ! result->isVoid() ) { |
---|
| 478 | static UniqueName retNamer("_tmp_stmtexpr_ret"); |
---|
| 479 | |
---|
| 480 | // create variable that will hold the result of the stmt expr |
---|
| 481 | result = result->clone(); |
---|
| 482 | env->apply( result ); |
---|
[3aeaecd] | 483 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
[615a096] | 484 | ret->get_type()->set_const( false ); |
---|
[31f379c] | 485 | stmtExpr->get_returnDecls().push_front( ret ); |
---|
| 486 | |
---|
| 487 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
| 488 | CompoundStmt * body = stmtExpr->get_statements(); |
---|
| 489 | assert( ! body->get_kids().empty() ); |
---|
| 490 | // must be an ExprStmt, otherwise it wouldn't have a result |
---|
[e3e16bc] | 491 | ExprStmt * last = strict_dynamic_cast< ExprStmt * >( body->get_kids().back() ); |
---|
[31f379c] | 492 | last->set_expr( makeCtorDtor( "?{}", ret, last->get_expr() ) ); |
---|
| 493 | |
---|
[092528b] | 494 | stmtExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
---|
[31f379c] | 495 | } // if |
---|
| 496 | } |
---|
| 497 | |
---|
[c0714bf] | 498 | void ResolveCopyCtors::previsit( UniqueExpr * unqExpr ) { |
---|
[597db97] | 499 | unqCount[ unqExpr->get_id() ]++; // count the number of unique expressions for each ID |
---|
[c0714bf] | 500 | if ( vars.count( unqExpr->get_id() ) ) { |
---|
| 501 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 502 | visit_children = false; |
---|
| 503 | } |
---|
| 504 | } |
---|
| 505 | |
---|
[ddae809] | 506 | // to prevent warnings (‘_unq0’ may be used uninitialized in this function), |
---|
| 507 | // insert an appropriate zero initializer for UniqueExpr temporaries. |
---|
| 508 | Initializer * makeInit( Type * t ) { |
---|
| 509 | if ( StructInstType * inst = dynamic_cast< StructInstType * >( t ) ) { |
---|
| 510 | // initizer for empty struct must be empty |
---|
| 511 | if ( inst->baseStruct->members.empty() ) return new ListInit({}); |
---|
| 512 | } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( t ) ) { |
---|
| 513 | // initizer for empty union must be empty |
---|
| 514 | if ( inst->baseUnion->members.empty() ) return new ListInit({}); |
---|
| 515 | } |
---|
| 516 | |
---|
| 517 | return new ListInit( { new SingleInit( new ConstantExpr( Constant::from_int( 0 ) ) ) } ); |
---|
| 518 | } |
---|
| 519 | |
---|
[c0714bf] | 520 | void ResolveCopyCtors::postvisit( UniqueExpr * unqExpr ) { |
---|
[141b786] | 521 | if ( vars.count( unqExpr->get_id() ) ) { |
---|
| 522 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 523 | return; |
---|
| 524 | } |
---|
| 525 | |
---|
| 526 | // it should never be necessary to wrap a void-returning expression in a UniqueExpr - if this assumption changes, this needs to be rethought |
---|
| 527 | assert( unqExpr->get_result() ); |
---|
| 528 | if ( ImplicitCopyCtorExpr * impCpCtorExpr = dynamic_cast<ImplicitCopyCtorExpr*>( unqExpr->get_expr() ) ) { |
---|
| 529 | // note the variable used as the result from the call |
---|
| 530 | assert( impCpCtorExpr->get_result() && impCpCtorExpr->get_returnDecls().size() == 1 ); |
---|
| 531 | unqExpr->set_var( new VariableExpr( impCpCtorExpr->get_returnDecls().front() ) ); |
---|
| 532 | } else { |
---|
| 533 | // expr isn't a call expr, so create a new temporary variable to use to hold the value of the unique expression |
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[ddae809] | 534 | unqExpr->set_object( ObjectDecl::newObject( toString("_unq", unqExpr->get_id()), unqExpr->get_result()->clone(), makeInit( unqExpr->get_result() ) ) ); |
---|
[141b786] | 535 | unqExpr->set_var( new VariableExpr( unqExpr->get_object() ) ); |
---|
| 536 | } |
---|
| 537 | vars.insert( unqExpr->get_id() ); |
---|
| 538 | } |
---|
| 539 | |
---|
[dc2334c] | 540 | Expression * FixCopyCtors::postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
---|
[c2931ea] | 541 | CP_CTOR_PRINT( std::cerr << "FixCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 542 | |
---|
| 543 | std::list< ObjectDecl * > & tempDecls = impCpCtorExpr->get_tempDecls(); |
---|
| 544 | std::list< ObjectDecl * > & returnDecls = impCpCtorExpr->get_returnDecls(); |
---|
| 545 | std::list< Expression * > & dtors = impCpCtorExpr->get_dtors(); |
---|
[845cedc] | 546 | |
---|
[c2931ea] | 547 | // add all temporary declarations and their constructors |
---|
| 548 | for ( ObjectDecl * obj : tempDecls ) { |
---|
[ba3706f] | 549 | stmtsToAddBefore.push_back( new DeclStmt( obj ) ); |
---|
[adcc065] | 550 | } // for |
---|
[c2931ea] | 551 | for ( ObjectDecl * obj : returnDecls ) { |
---|
[ba3706f] | 552 | stmtsToAddBefore.push_back( new DeclStmt( obj ) ); |
---|
[adcc065] | 553 | } // for |
---|
[db4ecc5] | 554 | |
---|
[c2931ea] | 555 | // add destructors after current statement |
---|
| 556 | for ( Expression * dtor : dtors ) { |
---|
[ba3706f] | 557 | stmtsToAddAfter.push_back( new ExprStmt( dtor ) ); |
---|
[adcc065] | 558 | } // for |
---|
[db4ecc5] | 559 | |
---|
[c0714bf] | 560 | ObjectDecl * returnDecl = returnDecls.empty() ? nullptr : returnDecls.front(); |
---|
[c2931ea] | 561 | Expression * callExpr = impCpCtorExpr->get_callExpr(); |
---|
| 562 | |
---|
| 563 | CP_CTOR_PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
---|
| 564 | |
---|
| 565 | // detach fields from wrapper node so that it can be deleted without deleting too much |
---|
| 566 | dtors.clear(); |
---|
| 567 | tempDecls.clear(); |
---|
| 568 | returnDecls.clear(); |
---|
[c0714bf] | 569 | impCpCtorExpr->set_callExpr( nullptr ); |
---|
| 570 | std::swap( impCpCtorExpr->env, callExpr->env ); |
---|
| 571 | assert( impCpCtorExpr->env == nullptr ); |
---|
[c2931ea] | 572 | delete impCpCtorExpr; |
---|
| 573 | |
---|
| 574 | if ( returnDecl ) { |
---|
[f5c3b6c] | 575 | ApplicationExpr * assign = createBitwiseAssignment( new VariableExpr( returnDecl ), callExpr ); |
---|
[c2931ea] | 576 | Expression * retExpr = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
---|
[31f379c] | 577 | // move env from callExpr to retExpr |
---|
[50377a4] | 578 | std::swap( retExpr->env, callExpr->env ); |
---|
[c2931ea] | 579 | return retExpr; |
---|
| 580 | } else { |
---|
| 581 | return callExpr; |
---|
[adcc065] | 582 | } // if |
---|
[4ffdd63] | 583 | } |
---|
[c2931ea] | 584 | |
---|
[dc2334c] | 585 | void FixCopyCtors::premutate( StmtExpr * stmtExpr ) { |
---|
[65aca88] | 586 | // function call temporaries should be placed at statement-level, rather than nested inside of a new statement expression, |
---|
| 587 | // since temporaries can be shared across sub-expressions, e.g. |
---|
| 588 | // [A, A] f(); |
---|
| 589 | // g([A] x, [A] y); |
---|
[dc2334c] | 590 | // g(f()); |
---|
[65aca88] | 591 | // f is executed once, so the return temporary is shared across the tuple constructors for x and y. |
---|
[dc2334c] | 592 | // Explicitly mutating children instead of mutating the inner compound statment forces the temporaries to be added |
---|
| 593 | // to the outer context, rather than inside of the statement expression. |
---|
| 594 | visit_children = false; |
---|
[65aca88] | 595 | std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids(); |
---|
| 596 | for ( Statement *& stmt : stmts ) { |
---|
[dc2334c] | 597 | stmt = stmt->acceptMutator( *visitor ); |
---|
[65aca88] | 598 | } // for |
---|
[31f379c] | 599 | assert( stmtExpr->get_result() ); |
---|
| 600 | Type * result = stmtExpr->get_result(); |
---|
| 601 | if ( ! result->isVoid() ) { |
---|
| 602 | for ( ObjectDecl * obj : stmtExpr->get_returnDecls() ) { |
---|
[ba3706f] | 603 | stmtsToAddBefore.push_back( new DeclStmt( obj ) ); |
---|
[31f379c] | 604 | } // for |
---|
| 605 | // add destructors after current statement |
---|
| 606 | for ( Expression * dtor : stmtExpr->get_dtors() ) { |
---|
[ba3706f] | 607 | stmtsToAddAfter.push_back( new ExprStmt( dtor ) ); |
---|
[31f379c] | 608 | } // for |
---|
| 609 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
[dc2334c] | 610 | assert( ! stmts.empty() ); |
---|
[31f379c] | 611 | assert( ! stmtExpr->get_returnDecls().empty() ); |
---|
[ba3706f] | 612 | stmts.push_back( new ExprStmt( new VariableExpr( stmtExpr->get_returnDecls().front() ) ) ); |
---|
[a28bc02] | 613 | stmtExpr->get_returnDecls().clear(); |
---|
| 614 | stmtExpr->get_dtors().clear(); |
---|
[31f379c] | 615 | } |
---|
[a28bc02] | 616 | assert( stmtExpr->get_returnDecls().empty() ); |
---|
| 617 | assert( stmtExpr->get_dtors().empty() ); |
---|
[31f379c] | 618 | } |
---|
| 619 | |
---|
[dc2334c] | 620 | void FixCopyCtors::premutate( UniqueExpr * unqExpr ) { |
---|
| 621 | visit_children = false; |
---|
[597db97] | 622 | unqCount[ unqExpr->get_id() ]--; |
---|
| 623 | static std::unordered_map< int, std::list< Statement * > > dtors; |
---|
[141b786] | 624 | static std::unordered_map< int, UniqueExpr * > unqMap; |
---|
| 625 | // has to be done to clean up ImplicitCopyCtorExpr nodes, even when this node was skipped in previous passes |
---|
| 626 | if ( unqMap.count( unqExpr->get_id() ) ) { |
---|
| 627 | // take data from other UniqueExpr to ensure consistency |
---|
| 628 | delete unqExpr->get_expr(); |
---|
| 629 | unqExpr->set_expr( unqMap[unqExpr->get_id()]->get_expr()->clone() ); |
---|
| 630 | delete unqExpr->get_result(); |
---|
| 631 | unqExpr->set_result( maybeClone( unqExpr->get_expr()->get_result() ) ); |
---|
[597db97] | 632 | if ( unqCount[ unqExpr->get_id() ] == 0 ) { // insert destructor after the last use of the unique expression |
---|
[edbdbe6] | 633 | stmtsToAddAfter.splice( stmtsToAddAfter.end(), dtors[ unqExpr->get_id() ] ); |
---|
[597db97] | 634 | } |
---|
[dc2334c] | 635 | return; |
---|
[141b786] | 636 | } |
---|
[dc2334c] | 637 | PassVisitor<FixCopyCtors> fixer( unqCount ); |
---|
[597db97] | 638 | unqExpr->set_expr( unqExpr->get_expr()->acceptMutator( fixer ) ); // stmtexprs contained should not be separately fixed, so this must occur after the lookup |
---|
[dc2334c] | 639 | stmtsToAddBefore.splice( stmtsToAddBefore.end(), fixer.pass.stmtsToAddBefore ); |
---|
[141b786] | 640 | unqMap[unqExpr->get_id()] = unqExpr; |
---|
[edbdbe6] | 641 | if ( unqCount[ unqExpr->get_id() ] == 0 ) { // insert destructor after the last use of the unique expression |
---|
| 642 | stmtsToAddAfter.splice( stmtsToAddAfter.end(), dtors[ unqExpr->get_id() ] ); |
---|
| 643 | } else { // remember dtors for last instance of unique expr |
---|
[dc2334c] | 644 | dtors[ unqExpr->get_id() ] = fixer.pass.stmtsToAddAfter; |
---|
[141b786] | 645 | } |
---|
[dc2334c] | 646 | return; |
---|
[141b786] | 647 | } |
---|
| 648 | |
---|
[20eacb7] | 649 | DeclarationWithType * getDtorFunc( ObjectDecl * objDecl, Statement * input, std::list< Statement * > & stmtsToAdd ) { |
---|
| 650 | // unwrap implicit statement wrapper |
---|
[9d06142] | 651 | Statement * dtor = input; |
---|
| 652 | if ( ImplicitCtorDtorStmt * implicit = dynamic_cast< ImplicitCtorDtorStmt * >( input ) ) { |
---|
| 653 | // dtor = implicit->callStmt; |
---|
| 654 | // implicit->callStmt = nullptr; |
---|
| 655 | } |
---|
[20eacb7] | 656 | assert( dtor ); |
---|
| 657 | std::list< Expression * > matches; |
---|
| 658 | collectCtorDtorCalls( dtor, matches ); |
---|
| 659 | |
---|
[1bc749f] | 660 | if ( dynamic_cast< ExprStmt * >( dtor ) ) { |
---|
[20eacb7] | 661 | // only one destructor call in the expression |
---|
| 662 | if ( matches.size() == 1 ) { |
---|
| 663 | DeclarationWithType * func = getFunction( matches.front() ); |
---|
| 664 | assertf( func, "getFunction failed to find function in %s", toString( matches.front() ).c_str() ); |
---|
| 665 | |
---|
[1bc749f] | 666 | // cleanup argument must be a function, not an object (including function pointer) |
---|
| 667 | if ( FunctionDecl * dtorFunc = dynamic_cast< FunctionDecl * > ( func ) ) { |
---|
| 668 | if ( dtorFunc->type->forall.empty() ) { |
---|
| 669 | // simple case where the destructor is a monomorphic function call - can simply |
---|
| 670 | // use that function as the cleanup function. |
---|
| 671 | delete dtor; |
---|
| 672 | return func; |
---|
| 673 | } |
---|
| 674 | } |
---|
| 675 | } |
---|
| 676 | } |
---|
| 677 | |
---|
| 678 | // otherwise the cleanup is more complicated - need to build a single argument cleanup function that |
---|
| 679 | // wraps the more complicated code. |
---|
| 680 | static UniqueName dtorNamer( "__cleanup_dtor" ); |
---|
[88e79ad] | 681 | FunctionDecl * dtorFunc = FunctionDecl::newFunction( dtorNamer.newName(), SymTab::genDefaultType( objDecl->type->stripReferences(), false ), new CompoundStmt( noLabels ) ); |
---|
| 682 | stmtsToAdd.push_back( new DeclStmt( noLabels, dtorFunc ) ); |
---|
[1bc749f] | 683 | |
---|
| 684 | // the original code contains uses of objDecl - replace them with the newly generated 'this' parameter. |
---|
[837ce06] | 685 | ObjectDecl * thisParam = getParamThis( dtorFunc->type ); |
---|
[96fc67b] | 686 | Expression * replacement = new VariableExpr( thisParam ); |
---|
[20eacb7] | 687 | |
---|
| 688 | Type * base = replacement->result->stripReferences(); |
---|
| 689 | if ( dynamic_cast< ArrayType * >( base ) || dynamic_cast< TupleType * > ( base ) ) { |
---|
[9d06142] | 690 | // need to cast away reference for array types, since the destructor is generated without the reference type, |
---|
| 691 | // and for tuple types since tuple indexing does not work directly on a reference |
---|
[20eacb7] | 692 | replacement = new CastExpr( replacement, base->clone() ); |
---|
[96fc67b] | 693 | } |
---|
| 694 | VarExprReplacer::replace( dtor, { std::make_pair( objDecl, replacement ) } ); |
---|
[1bc749f] | 695 | dtorFunc->statements->push_back( dtor ); |
---|
| 696 | |
---|
| 697 | return dtorFunc; |
---|
| 698 | } |
---|
| 699 | |
---|
| 700 | DeclarationWithType * FixInit::postmutate( ObjectDecl *objDecl ) { |
---|
[aff3af4] | 701 | // since this removes the init field from objDecl, it must occur after children are mutated (i.e. postmutate) |
---|
[c2931ea] | 702 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 703 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 704 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 705 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
---|
[08d5507b] | 706 | if ( objDecl->get_storageClasses().is_static ) { |
---|
[72e9222] | 707 | // originally wanted to take advantage of gcc nested functions, but |
---|
[f9cebb5] | 708 | // we get memory errors with this approach. To remedy this, the static |
---|
| 709 | // variable is hoisted when the destructor needs to be called. |
---|
[72e9222] | 710 | // |
---|
[c2931ea] | 711 | // generate: |
---|
[f9cebb5] | 712 | // static T __objName_static_varN; |
---|
[72e9222] | 713 | // void __objName_dtor_atexitN() { |
---|
[f9cebb5] | 714 | // __dtor__...; |
---|
[72e9222] | 715 | // } |
---|
| 716 | // int f(...) { |
---|
| 717 | // ... |
---|
| 718 | // static bool __objName_uninitialized = true; |
---|
| 719 | // if (__objName_uninitialized) { |
---|
| 720 | // __ctor(__objName); |
---|
| 721 | // __objName_uninitialized = false; |
---|
[f9cebb5] | 722 | // atexit(__objName_dtor_atexitN); |
---|
[c2931ea] | 723 | // } |
---|
[72e9222] | 724 | // ... |
---|
[c2931ea] | 725 | // } |
---|
| 726 | |
---|
[72e9222] | 727 | static UniqueName dtorCallerNamer( "_dtor_atexit" ); |
---|
| 728 | |
---|
| 729 | // static bool __objName_uninitialized = true |
---|
[c2931ea] | 730 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
---|
[579263a] | 731 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant::from_int( 1 ) ) ); |
---|
[68fe077a] | 732 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
---|
[c2931ea] | 733 | isUninitializedVar->fixUniqueId(); |
---|
| 734 | |
---|
| 735 | // __objName_uninitialized = false; |
---|
| 736 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 737 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
---|
[d56e5bc] | 738 | setTrue->get_args().push_back( new ConstantExpr( Constant::from_int( 0 ) ) ); |
---|
[c2931ea] | 739 | |
---|
| 740 | // generate body of if |
---|
[ba3706f] | 741 | CompoundStmt * initStmts = new CompoundStmt(); |
---|
[c2931ea] | 742 | std::list< Statement * > & body = initStmts->get_kids(); |
---|
| 743 | body.push_back( ctor ); |
---|
[ba3706f] | 744 | body.push_back( new ExprStmt( setTrue ) ); |
---|
[c2931ea] | 745 | |
---|
| 746 | // put it all together |
---|
[ba3706f] | 747 | IfStmt * ifStmt = new IfStmt( new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
---|
| 748 | stmtsToAddAfter.push_back( new DeclStmt( isUninitializedVar ) ); |
---|
[c2931ea] | 749 | stmtsToAddAfter.push_back( ifStmt ); |
---|
[72e9222] | 750 | |
---|
[a4dd728] | 751 | Statement * dtor = ctorInit->get_dtor(); |
---|
[62423350] | 752 | objDecl->set_init( nullptr ); |
---|
| 753 | ctorInit->set_ctor( nullptr ); |
---|
[a4dd728] | 754 | ctorInit->set_dtor( nullptr ); |
---|
| 755 | if ( dtor ) { |
---|
[f9cebb5] | 756 | // if the object has a non-trivial destructor, have to |
---|
| 757 | // hoist it and the object into the global space and |
---|
| 758 | // call the destructor function with atexit. |
---|
| 759 | |
---|
[a4dd728] | 760 | Statement * dtorStmt = dtor->clone(); |
---|
[f9cebb5] | 761 | |
---|
| 762 | // void __objName_dtor_atexitN(...) {...} |
---|
[ba3706f] | 763 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + dtorCallerNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt() ); |
---|
[f9cebb5] | 764 | dtorCaller->fixUniqueId(); |
---|
[c8dfcd3] | 765 | dtorCaller->get_statements()->push_back( dtorStmt ); |
---|
[f9cebb5] | 766 | |
---|
| 767 | // atexit(dtor_atexit); |
---|
| 768 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
---|
| 769 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
---|
| 770 | |
---|
[ba3706f] | 771 | body.push_back( new ExprStmt( callAtexit ) ); |
---|
[f9cebb5] | 772 | |
---|
| 773 | // hoist variable and dtor caller decls to list of decls that will be added into global scope |
---|
| 774 | staticDtorDecls.push_back( objDecl ); |
---|
| 775 | staticDtorDecls.push_back( dtorCaller ); |
---|
| 776 | |
---|
| 777 | // need to rename object uniquely since it now appears |
---|
| 778 | // at global scope and there could be multiple function-scoped |
---|
| 779 | // static variables with the same name in different functions. |
---|
[c8dfcd3] | 780 | // Note: it isn't sufficient to modify only the mangleName, because |
---|
| 781 | // then subsequent Indexer passes can choke on seeing the object's name |
---|
| 782 | // if another object has the same name and type. An unfortunate side-effect |
---|
| 783 | // of renaming the object is that subsequent NameExprs may fail to resolve, |
---|
| 784 | // but there shouldn't be any remaining past this point. |
---|
[f9cebb5] | 785 | static UniqueName staticNamer( "_static_var" ); |
---|
[c8dfcd3] | 786 | objDecl->set_name( objDecl->get_name() + staticNamer.newName() ); |
---|
| 787 | objDecl->set_mangleName( SymTab::Mangler::mangle( objDecl ) ); |
---|
[f9cebb5] | 788 | |
---|
| 789 | // xxx - temporary hack: need to return a declaration, but want to hoist the current object out of this scope |
---|
| 790 | // create a new object which is never used |
---|
| 791 | static UniqueName dummyNamer( "_dummy" ); |
---|
[68fe077a] | 792 | ObjectDecl * dummy = new ObjectDecl( dummyNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), 0, std::list< Attribute * >{ new Attribute("unused") } ); |
---|
[a4dd728] | 793 | delete ctorInit; |
---|
[f9cebb5] | 794 | return dummy; |
---|
| 795 | } |
---|
[c2931ea] | 796 | } else { |
---|
[e3e16bc] | 797 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * > ( ctor ); |
---|
[b0f601fa] | 798 | ExprStmt * ctorStmt = dynamic_cast< ExprStmt * >( implicit->callStmt ); |
---|
[233e4d9] | 799 | ApplicationExpr * ctorCall = nullptr; |
---|
[b0f601fa] | 800 | if ( ctorStmt && (ctorCall = isIntrinsicCallExpr( ctorStmt->expr )) && ctorCall->get_args().size() == 2 ) { |
---|
[233e4d9] | 801 | // clean up intrinsic copy constructor calls by making them into SingleInits |
---|
[e41306d] | 802 | Expression * ctorArg = ctorCall->args.back(); |
---|
| 803 | std::swap( ctorArg->env, ctorCall->env ); |
---|
| 804 | objDecl->init = new SingleInit( ctorArg ); |
---|
| 805 | |
---|
[b0f601fa] | 806 | ctorCall->args.pop_back(); |
---|
[233e4d9] | 807 | } else { |
---|
| 808 | stmtsToAddAfter.push_back( ctor ); |
---|
[b0f601fa] | 809 | objDecl->init = nullptr; |
---|
| 810 | ctorInit->ctor = nullptr; |
---|
[233e4d9] | 811 | } |
---|
[1bc749f] | 812 | |
---|
| 813 | Statement * dtor = ctorInit->dtor; |
---|
| 814 | if ( dtor ) { |
---|
| 815 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * >( dtor ); |
---|
| 816 | Statement * dtorStmt = implicit->callStmt; |
---|
[20eacb7] | 817 | |
---|
[1bc749f] | 818 | // don't need to call intrinsic dtor, because it does nothing, but |
---|
| 819 | // non-intrinsic dtors must be called |
---|
| 820 | if ( ! isIntrinsicSingleArgCallStmt( dtorStmt ) ) { |
---|
| 821 | // set dtor location to the object's location for error messages |
---|
[88e79ad] | 822 | DeclarationWithType * dtorFunc = getDtorFunc( objDecl, dtorStmt, stmtsToAddBefore ); |
---|
[1bc749f] | 823 | objDecl->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( dtorFunc ) } ) ); |
---|
| 824 | ctorInit->dtor = nullptr; |
---|
| 825 | } // if |
---|
| 826 | } |
---|
[adcc065] | 827 | } // if |
---|
[b0f601fa] | 828 | } else if ( Initializer * init = ctorInit->init ) { |
---|
| 829 | objDecl->init = init; |
---|
| 830 | ctorInit->init = nullptr; |
---|
[c2931ea] | 831 | } else { |
---|
| 832 | // no constructor and no initializer, which is okay |
---|
[b0f601fa] | 833 | objDecl->init = nullptr; |
---|
[adcc065] | 834 | } // if |
---|
[c2931ea] | 835 | delete ctorInit; |
---|
[adcc065] | 836 | } // if |
---|
[c2931ea] | 837 | return objDecl; |
---|
[db4ecc5] | 838 | } |
---|
| 839 | |
---|
[698ec72] | 840 | void ObjDeclCollector::previsit( CompoundStmt * ) { |
---|
| 841 | GuardValue( curVars ); |
---|
[db4ecc5] | 842 | } |
---|
| 843 | |
---|
[698ec72] | 844 | void ObjDeclCollector::previsit( DeclStmt * stmt ) { |
---|
[4b2589a] | 845 | // keep track of all variables currently in scope |
---|
[c2931ea] | 846 | if ( ObjectDecl * objDecl = dynamic_cast< ObjectDecl * > ( stmt->get_decl() ) ) { |
---|
[62423350] | 847 | curVars.push_back( objDecl ); |
---|
[adcc065] | 848 | } // if |
---|
[db4ecc5] | 849 | } |
---|
| 850 | |
---|
[698ec72] | 851 | void LabelFinder::previsit( Statement * stmt ) { |
---|
[4b2589a] | 852 | // for each label, remember the variables in scope at that label. |
---|
[c2931ea] | 853 | for ( Label l : stmt->get_labels() ) { |
---|
| 854 | vars[l] = curVars; |
---|
[adcc065] | 855 | } // for |
---|
[71f4e4f] | 856 | } |
---|
[f1e012b] | 857 | |
---|
[698ec72] | 858 | void LabelFinder::previsit( CompoundStmt * stmt ) { |
---|
| 859 | previsit( (Statement *)stmt ); |
---|
| 860 | Parent::previsit( stmt ); |
---|
| 861 | } |
---|
| 862 | |
---|
| 863 | void LabelFinder::previsit( DeclStmt * stmt ) { |
---|
| 864 | previsit( (Statement *)stmt ); |
---|
| 865 | Parent::previsit( stmt ); |
---|
| 866 | } |
---|
| 867 | |
---|
| 868 | |
---|
| 869 | void InsertDtors::previsit( FunctionDecl * funcDecl ) { |
---|
[52c14b3] | 870 | // each function needs to have its own set of labels |
---|
[698ec72] | 871 | GuardValue( labelVars ); |
---|
[52c14b3] | 872 | labelVars.clear(); |
---|
[680620d] | 873 | // LabelFinder does not recurse into FunctionDecl, so need to visit |
---|
| 874 | // its children manually. |
---|
[698ec72] | 875 | maybeAccept( funcDecl->type, finder ); |
---|
| 876 | maybeAccept( funcDecl->statements, finder ); |
---|
[52c14b3] | 877 | |
---|
[698ec72] | 878 | // all labels for this function have been collected, insert destructors as appropriate via implicit recursion. |
---|
[52c14b3] | 879 | } |
---|
| 880 | |
---|
[adcc065] | 881 | // Handle break/continue/goto in the same manner as C++. Basic idea: any objects that are in scope at the |
---|
| 882 | // BranchStmt but not at the labelled (target) statement must be destructed. If there are any objects in scope |
---|
| 883 | // at the target location but not at the BranchStmt then those objects would be uninitialized so notify the user |
---|
| 884 | // of the error. See C++ Reference 6.6 Jump Statements for details. |
---|
[c2931ea] | 885 | void InsertDtors::handleGoto( BranchStmt * stmt ) { |
---|
[5809461] | 886 | // can't do anything for computed goto |
---|
| 887 | if ( stmt->computedTarget ) return; |
---|
| 888 | |
---|
| 889 | assertf( stmt->get_target() != "", "BranchStmt missing a label: %s", toString( stmt ).c_str() ); |
---|
[c2931ea] | 890 | // S_L = lvars = set of objects in scope at label definition |
---|
| 891 | // S_G = curVars = set of objects in scope at goto statement |
---|
| 892 | ObjectSet & lvars = labelVars[ stmt->get_target() ]; |
---|
| 893 | |
---|
| 894 | DTOR_PRINT( |
---|
| 895 | std::cerr << "at goto label: " << stmt->get_target().get_name() << std::endl; |
---|
| 896 | std::cerr << "S_G = " << printSet( curVars ) << std::endl; |
---|
| 897 | std::cerr << "S_L = " << printSet( lvars ) << std::endl; |
---|
| 898 | ) |
---|
| 899 | |
---|
| 900 | ObjectSet diff; |
---|
| 901 | // S_L-S_G results in set of objects whose construction is skipped - it's an error if this set is non-empty |
---|
| 902 | std::set_difference( lvars.begin(), lvars.end(), curVars.begin(), curVars.end(), std::inserter( diff, diff.begin() ) ); |
---|
| 903 | DTOR_PRINT( |
---|
| 904 | std::cerr << "S_L-S_G = " << printSet( diff ) << std::endl; |
---|
| 905 | ) |
---|
| 906 | if ( ! diff.empty() ) { |
---|
| 907 | throw SemanticError( std::string("jump to label '") + stmt->get_target().get_name() + "' crosses initialization of " + (*diff.begin())->get_name() + " ", stmt ); |
---|
[adcc065] | 908 | } // if |
---|
[c2931ea] | 909 | } |
---|
[39786813] | 910 | |
---|
[698ec72] | 911 | void InsertDtors::previsit( BranchStmt * stmt ) { |
---|
[c2931ea] | 912 | switch( stmt->get_type() ) { |
---|
[adcc065] | 913 | case BranchStmt::Continue: |
---|
| 914 | case BranchStmt::Break: |
---|
| 915 | // could optimize the break/continue case, because the S_L-S_G check is unnecessary (this set should |
---|
| 916 | // always be empty), but it serves as a small sanity check. |
---|
| 917 | case BranchStmt::Goto: |
---|
| 918 | handleGoto( stmt ); |
---|
| 919 | break; |
---|
| 920 | default: |
---|
| 921 | assert( false ); |
---|
| 922 | } // switch |
---|
[c2931ea] | 923 | } |
---|
[79970ed] | 924 | |
---|
| 925 | bool checkWarnings( FunctionDecl * funcDecl ) { |
---|
| 926 | // only check for warnings if the current function is a user-defined |
---|
| 927 | // constructor or destructor |
---|
| 928 | if ( ! funcDecl ) return false; |
---|
| 929 | if ( ! funcDecl->get_statements() ) return false; |
---|
[bff227f] | 930 | return CodeGen::isCtorDtor( funcDecl->get_name() ) && ! LinkageSpec::isOverridable( funcDecl->get_linkage() ); |
---|
[79970ed] | 931 | } |
---|
| 932 | |
---|
[88e79ad] | 933 | void GenStructMemberCalls::previsit( StructDecl * structDecl ) { |
---|
| 934 | if ( ! dtorStruct && structDecl->name == "__Destructor" ) { |
---|
| 935 | dtorStruct = structDecl; |
---|
| 936 | } |
---|
| 937 | } |
---|
| 938 | |
---|
[9a707e4e] | 939 | void GenStructMemberCalls::previsit( FunctionDecl * funcDecl ) { |
---|
[b0f601fa] | 940 | GuardValue( function ); |
---|
[9a707e4e] | 941 | GuardValue( unhandled ); |
---|
| 942 | GuardValue( usedUninit ); |
---|
| 943 | GuardValue( thisParam ); |
---|
| 944 | GuardValue( isCtor ); |
---|
| 945 | GuardValue( structDecl ); |
---|
[64ac636] | 946 | errors = SemanticError(); // clear previous errors |
---|
[c8dfcd3] | 947 | |
---|
| 948 | // need to start with fresh sets |
---|
| 949 | unhandled.clear(); |
---|
| 950 | usedUninit.clear(); |
---|
[79970ed] | 951 | |
---|
[88e79ad] | 952 | if ( ! dtorStructDestroy && funcDecl->name == "__destroy_Destructor" ) { |
---|
| 953 | dtorStructDestroy = funcDecl; |
---|
| 954 | return; |
---|
| 955 | } |
---|
| 956 | |
---|
[79970ed] | 957 | function = funcDecl; |
---|
[bff227f] | 958 | isCtor = CodeGen::isConstructor( function->get_name() ); |
---|
[c8dfcd3] | 959 | if ( checkWarnings( function ) ) { |
---|
| 960 | FunctionType * type = function->get_functionType(); |
---|
[79970ed] | 961 | assert( ! type->get_parameters().empty() ); |
---|
[e3e16bc] | 962 | thisParam = strict_dynamic_cast< ObjectDecl * >( type->get_parameters().front() ); |
---|
[0a81c3f] | 963 | Type * thisType = getPointerBase( thisParam->get_type() ); |
---|
| 964 | StructInstType * structType = dynamic_cast< StructInstType * >( thisType ); |
---|
[79970ed] | 965 | if ( structType ) { |
---|
[44f6341] | 966 | structDecl = structType->get_baseStruct(); |
---|
[88e79ad] | 967 | if ( structDecl == dtorStruct ) return; |
---|
[79970ed] | 968 | for ( Declaration * member : structDecl->get_members() ) { |
---|
| 969 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
---|
| 970 | // record all of the struct type's members that need to be constructed or |
---|
| 971 | // destructed by the end of the function |
---|
| 972 | unhandled.insert( field ); |
---|
| 973 | } |
---|
| 974 | } |
---|
| 975 | } |
---|
| 976 | } |
---|
[9a707e4e] | 977 | } |
---|
| 978 | |
---|
| 979 | void GenStructMemberCalls::postvisit( FunctionDecl * funcDecl ) { |
---|
[c8dfcd3] | 980 | // remove the unhandled objects from usedUninit, because a call is inserted |
---|
| 981 | // to handle them - only objects that are later constructed are used uninitialized. |
---|
[64ac636] | 982 | std::map< DeclarationWithType *, CodeLocation > diff; |
---|
| 983 | // need the comparator since usedUninit and unhandled have different types |
---|
| 984 | struct comp_t { |
---|
| 985 | typedef decltype(usedUninit)::value_type usedUninit_t; |
---|
| 986 | typedef decltype(unhandled)::value_type unhandled_t; |
---|
| 987 | bool operator()(usedUninit_t x, unhandled_t y) { return x.first < y; } |
---|
| 988 | bool operator()(unhandled_t x, usedUninit_t y) { return x < y.first; } |
---|
| 989 | } comp; |
---|
| 990 | std::set_difference( usedUninit.begin(), usedUninit.end(), unhandled.begin(), unhandled.end(), std::inserter( diff, diff.begin() ), comp ); |
---|
| 991 | for ( auto p : diff ) { |
---|
| 992 | DeclarationWithType * member = p.first; |
---|
| 993 | CodeLocation loc = p.second; |
---|
| 994 | // xxx - make error message better by also tracking the location that the object is constructed at? |
---|
| 995 | emit( loc, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", member->get_name(), " used before being constructed" ); |
---|
[79970ed] | 996 | } |
---|
| 997 | |
---|
[c8dfcd3] | 998 | if ( ! unhandled.empty() ) { |
---|
[4618319] | 999 | // need to explicitly re-add function parameters to the indexer in order to resolve copy constructors |
---|
[9a707e4e] | 1000 | auto guard = makeFuncGuard( [this]() { indexer.enterScope(); }, [this]() { indexer.leaveScope(); } ); |
---|
[5fe35d6] | 1001 | indexer.addFunctionType( function->type ); |
---|
[44f6341] | 1002 | |
---|
| 1003 | // need to iterate through members in reverse in order for |
---|
| 1004 | // ctor/dtor statements to come out in the right order |
---|
[1ba88a0] | 1005 | for ( Declaration * member : reverseIterate( structDecl->get_members() ) ) { |
---|
[44f6341] | 1006 | DeclarationWithType * field = dynamic_cast< DeclarationWithType * >( member ); |
---|
| 1007 | // skip non-DWT members |
---|
| 1008 | if ( ! field ) continue; |
---|
[05807e9] | 1009 | // skip non-constructable members |
---|
| 1010 | if ( ! tryConstruct( field ) ) continue; |
---|
[44f6341] | 1011 | // skip handled members |
---|
| 1012 | if ( ! unhandled.count( field ) ) continue; |
---|
| 1013 | |
---|
| 1014 | // insert and resolve default/copy constructor call for each field that's unhandled |
---|
[c8dfcd3] | 1015 | std::list< Statement * > stmt; |
---|
[5fe35d6] | 1016 | Expression * arg2 = nullptr; |
---|
[4d4882a] | 1017 | if ( isCopyConstructor( function ) ) { |
---|
[44f6341] | 1018 | // if copy ctor, need to pass second-param-of-this-function.field |
---|
[4d4882a] | 1019 | std::list< DeclarationWithType * > & params = function->get_functionType()->get_parameters(); |
---|
| 1020 | assert( params.size() == 2 ); |
---|
[44f6341] | 1021 | arg2 = new MemberExpr( field, new VariableExpr( params.back() ) ); |
---|
[4d4882a] | 1022 | } |
---|
| 1023 | InitExpander srcParam( arg2 ); |
---|
[4618319] | 1024 | // cast away reference type and construct field. |
---|
| 1025 | Expression * thisExpr = new CastExpr( new VariableExpr( thisParam ), thisParam->get_type()->stripReferences()->clone() ); |
---|
| 1026 | Expression * memberDest = new MemberExpr( field, thisExpr ); |
---|
| 1027 | SymTab::genImplicitCall( srcParam, memberDest, function->get_name(), back_inserter( stmt ), field, isCtor ); |
---|
[c8dfcd3] | 1028 | |
---|
| 1029 | assert( stmt.size() <= 1 ); |
---|
| 1030 | if ( stmt.size() == 1 ) { |
---|
| 1031 | Statement * callStmt = stmt.front(); |
---|
| 1032 | |
---|
[9a707e4e] | 1033 | MutatingResolver resolver( indexer ); |
---|
[c8dfcd3] | 1034 | try { |
---|
| 1035 | callStmt->acceptMutator( resolver ); |
---|
| 1036 | if ( isCtor ) { |
---|
[88e79ad] | 1037 | function->statements->push_front( callStmt ); |
---|
[c8dfcd3] | 1038 | } else { |
---|
| 1039 | // destructor statements should be added at the end |
---|
[88e79ad] | 1040 | // function->get_statements()->push_back( callStmt ); |
---|
| 1041 | |
---|
[10dc6908] | 1042 | // Destructor _dtor0 = { &b.a1, (void (*)(void *)_destroy_A }; |
---|
[88e79ad] | 1043 | std::list< Statement * > stmtsToAdd; |
---|
| 1044 | |
---|
| 1045 | static UniqueName memberDtorNamer = { "__memberDtor" }; |
---|
| 1046 | assertf( dtorStruct, "builtin __Destructor not found." ); |
---|
| 1047 | assertf( dtorStructDestroy, "builtin __destroy_Destructor not found." ); |
---|
| 1048 | |
---|
| 1049 | Expression * thisExpr = new AddressExpr( new VariableExpr( thisParam ) ); |
---|
| 1050 | Expression * dtorExpr = new VariableExpr( getDtorFunc( thisParam, callStmt, stmtsToAdd ) ); |
---|
| 1051 | |
---|
[10dc6908] | 1052 | // cast destructor pointer to void (*)(void *), to silence GCC incompatible pointer warnings |
---|
| 1053 | FunctionType * dtorFtype = new FunctionType( Type::Qualifiers(), false ); |
---|
| 1054 | dtorFtype->parameters.push_back( ObjectDecl::newObject( "", new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), nullptr ) ); |
---|
| 1055 | Type * dtorType = new PointerType( Type::Qualifiers(), dtorFtype ); |
---|
| 1056 | |
---|
| 1057 | ObjectDecl * destructor = ObjectDecl::newObject( memberDtorNamer.newName(), new StructInstType( Type::Qualifiers(), dtorStruct ), new ListInit( { new SingleInit( thisExpr ), new SingleInit( new CastExpr( dtorExpr, dtorType ) ) } ) ); |
---|
[88e79ad] | 1058 | function->statements->push_front( new DeclStmt( noLabels, destructor ) ); |
---|
| 1059 | destructor->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( dtorStructDestroy ) } ) ); |
---|
| 1060 | |
---|
| 1061 | function->statements->kids.splice( function->statements->kids.begin(), stmtsToAdd ); |
---|
[c8dfcd3] | 1062 | } |
---|
| 1063 | } catch ( SemanticError & error ) { |
---|
[64ac636] | 1064 | emit( funcDecl->location, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", field->get_name(), " not explicitly ", isCtor ? "constructed" : "destructed", " and no ", isCtor ? "default constructor" : "destructor", " found" ); |
---|
[c8dfcd3] | 1065 | } |
---|
| 1066 | } |
---|
| 1067 | } |
---|
| 1068 | } |
---|
[64ac636] | 1069 | if (! errors.isEmpty()) { |
---|
| 1070 | throw errors; |
---|
| 1071 | } |
---|
[79970ed] | 1072 | } |
---|
| 1073 | |
---|
[4618319] | 1074 | /// true if expr is effectively just the 'this' parameter |
---|
| 1075 | bool isThisExpression( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1076 | // TODO: there are more complicated ways to pass 'this' to a constructor, e.g. &*, *&, etc. |
---|
| 1077 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
---|
| 1078 | return varExpr->get_var() == thisParam; |
---|
| 1079 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( expr ) ) { |
---|
| 1080 | return isThisExpression( castExpr->get_arg(), thisParam ); |
---|
| 1081 | } |
---|
| 1082 | return false; |
---|
| 1083 | } |
---|
| 1084 | |
---|
| 1085 | /// returns a MemberExpr if expr is effectively just member access on the 'this' parameter, else nullptr |
---|
| 1086 | MemberExpr * isThisMemberExpr( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1087 | if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
---|
| 1088 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1089 | return memberExpr; |
---|
| 1090 | } |
---|
| 1091 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
---|
| 1092 | return isThisMemberExpr( castExpr->get_arg(), thisParam ); |
---|
| 1093 | } |
---|
| 1094 | return nullptr; |
---|
| 1095 | } |
---|
| 1096 | |
---|
[9a707e4e] | 1097 | void GenStructMemberCalls::previsit( ApplicationExpr * appExpr ) { |
---|
| 1098 | if ( ! checkWarnings( function ) ) { |
---|
| 1099 | visit_children = false; |
---|
| 1100 | return; |
---|
| 1101 | } |
---|
[79970ed] | 1102 | |
---|
| 1103 | std::string fname = getFunctionName( appExpr ); |
---|
| 1104 | if ( fname == function->get_name() ) { |
---|
| 1105 | // call to same kind of function |
---|
| 1106 | Expression * firstParam = appExpr->get_args().front(); |
---|
| 1107 | |
---|
[4618319] | 1108 | if ( isThisExpression( firstParam, thisParam ) ) { |
---|
[79970ed] | 1109 | // if calling another constructor on thisParam, assume that function handles |
---|
| 1110 | // all members - if it doesn't a warning will appear in that function. |
---|
[4618319] | 1111 | unhandled.clear(); |
---|
| 1112 | } else if ( MemberExpr * memberExpr = isThisMemberExpr( firstParam, thisParam ) ) { |
---|
| 1113 | // if first parameter is a member expression on the this parameter, |
---|
| 1114 | // then remove the member from unhandled set. |
---|
| 1115 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1116 | unhandled.erase( memberExpr->get_member() ); |
---|
[79970ed] | 1117 | } |
---|
| 1118 | } |
---|
| 1119 | } |
---|
| 1120 | } |
---|
| 1121 | |
---|
[9a707e4e] | 1122 | void GenStructMemberCalls::previsit( MemberExpr * memberExpr ) { |
---|
| 1123 | if ( ! checkWarnings( function ) || ! isCtor ) { |
---|
| 1124 | visit_children = false; |
---|
| 1125 | return; |
---|
| 1126 | } |
---|
[79970ed] | 1127 | |
---|
[4618319] | 1128 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1129 | if ( unhandled.count( memberExpr->get_member() ) ) { |
---|
| 1130 | // emit a warning because a member was used before it was constructed |
---|
| 1131 | usedUninit.insert( { memberExpr->get_member(), memberExpr->location } ); |
---|
[79970ed] | 1132 | } |
---|
| 1133 | } |
---|
| 1134 | } |
---|
[3906301] | 1135 | |
---|
| 1136 | template< typename Visitor, typename... Params > |
---|
[64ac636] | 1137 | void error( Visitor & v, CodeLocation loc, const Params &... params ) { |
---|
| 1138 | SemanticError err( toString( params... ) ); |
---|
| 1139 | err.set_location( loc ); |
---|
| 1140 | v.errors.append( err ); |
---|
[3906301] | 1141 | } |
---|
| 1142 | |
---|
| 1143 | template< typename... Params > |
---|
[64ac636] | 1144 | void GenStructMemberCalls::emit( CodeLocation loc, const Params &... params ) { |
---|
[3906301] | 1145 | // toggle warnings vs. errors here. |
---|
| 1146 | // warn( params... ); |
---|
[64ac636] | 1147 | error( *this, loc, params... ); |
---|
[3906301] | 1148 | } |
---|
[c8dfcd3] | 1149 | |
---|
[08da53d] | 1150 | DeclarationWithType * MutatingResolver::mutate( ObjectDecl * objectDecl ) { |
---|
[c8dfcd3] | 1151 | // add object to the indexer assumes that there will be no name collisions |
---|
| 1152 | // in generated code. If this changes, add mutate methods for entities with |
---|
| 1153 | // scope and call {enter,leave}Scope explicitly. |
---|
[33a25f9] | 1154 | indexer.addId( objectDecl ); |
---|
[c8dfcd3] | 1155 | return objectDecl; |
---|
| 1156 | } |
---|
| 1157 | |
---|
[08da53d] | 1158 | Expression * MutatingResolver::mutate( UntypedExpr * untypedExpr ) { |
---|
| 1159 | Expression * newExpr = untypedExpr; |
---|
| 1160 | ResolvExpr::findVoidExpression( newExpr, indexer ); |
---|
| 1161 | return newExpr; |
---|
[c8dfcd3] | 1162 | } |
---|
[b6fe7e6] | 1163 | |
---|
[696bf6e] | 1164 | Expression * FixCtorExprs::postmutate( ConstructorExpr * ctorExpr ) { |
---|
[b6fe7e6] | 1165 | static UniqueName tempNamer( "_tmp_ctor_expr" ); |
---|
[f0121d7] | 1166 | // xxx - is the size check necessary? |
---|
[d29fa5f] | 1167 | assert( ctorExpr->result && ctorExpr->get_result()->size() == 1 ); |
---|
[b7b8674] | 1168 | |
---|
[627f585] | 1169 | // xxx - this can be TupleAssignExpr now. Need to properly handle this case. |
---|
[e3e16bc] | 1170 | ApplicationExpr * callExpr = strict_dynamic_cast< ApplicationExpr * > ( ctorExpr->get_callExpr() ); |
---|
[b6fe7e6] | 1171 | TypeSubstitution * env = ctorExpr->get_env(); |
---|
| 1172 | ctorExpr->set_callExpr( nullptr ); |
---|
| 1173 | ctorExpr->set_env( nullptr ); |
---|
[f5c3b6c] | 1174 | |
---|
| 1175 | // xxx - ideally we would reuse the temporary generated from the copy constructor passes from within firstArg if it exists and not generate a temporary if it's unnecessary. |
---|
| 1176 | ObjectDecl * tmp = ObjectDecl::newObject( tempNamer.newName(), callExpr->args.front()->result->clone(), nullptr ); |
---|
| 1177 | declsToAddBefore.push_back( tmp ); |
---|
[8a6cf7e] | 1178 | delete ctorExpr; |
---|
[b6fe7e6] | 1179 | |
---|
[696bf6e] | 1180 | // build assignment and replace constructor's first argument with new temporary |
---|
[b6fe7e6] | 1181 | Expression *& firstArg = callExpr->get_args().front(); |
---|
[696bf6e] | 1182 | Expression * assign = new UntypedExpr( new NameExpr( "?=?" ), { new AddressExpr( new VariableExpr( tmp ) ), new AddressExpr( firstArg ) } ); |
---|
[8a6cf7e] | 1183 | firstArg = new VariableExpr( tmp ); |
---|
| 1184 | |
---|
[696bf6e] | 1185 | // resolve assignment and dispose of new env |
---|
[08da53d] | 1186 | ResolvExpr::findVoidExpression( assign, indexer ); |
---|
| 1187 | delete assign->env; |
---|
| 1188 | assign->env = nullptr; |
---|
[696bf6e] | 1189 | |
---|
[8a6cf7e] | 1190 | // for constructor expr: |
---|
| 1191 | // T x; |
---|
| 1192 | // x{}; |
---|
| 1193 | // results in: |
---|
| 1194 | // T x; |
---|
| 1195 | // T & tmp; |
---|
| 1196 | // &tmp = &x, ?{}(tmp), tmp |
---|
[08da53d] | 1197 | CommaExpr * commaExpr = new CommaExpr( assign, new CommaExpr( callExpr, new VariableExpr( tmp ) ) ); |
---|
[b6fe7e6] | 1198 | commaExpr->set_env( env ); |
---|
| 1199 | return commaExpr; |
---|
| 1200 | } |
---|
[c2931ea] | 1201 | } // namespace |
---|
[71f4e4f] | 1202 | } // namespace InitTweak |
---|
| 1203 | |
---|
| 1204 | // Local Variables: // |
---|
| 1205 | // tab-width: 4 // |
---|
| 1206 | // mode: c++ // |
---|
| 1207 | // compile-command: "make install" // |
---|
| 1208 | // End: // |
---|