[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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[9fe33947] | 7 | // FixInit.cc -- |
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[71f4e4f] | 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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[90152a4] | 56 | #include "SynTree/DeclReplacer.h" // for DeclReplacer |
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[d180746] | 57 | #include "SynTree/Visitor.h" // for acceptAll, maybeAccept |
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[2bfc6b2] | 58 | #include "Validate/FindSpecialDecls.h" // for dtorStmt, dtorStructDestroy |
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[71f4e4f] | 59 | |
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[f0121d7] | 60 | bool ctordtorp = false; // print all debug |
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| 61 | bool ctorp = false; // print ctor debug |
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| 62 | bool cpctorp = false; // print copy ctor debug |
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| 63 | bool dtorp = false; // print dtor debug |
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[845cedc] | 64 | #define PRINT( text ) if ( ctordtorp ) { text } |
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[c2931ea] | 65 | #define CP_CTOR_PRINT( text ) if ( ctordtorp || cpctorp ) { text } |
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| 66 | #define DTOR_PRINT( text ) if ( ctordtorp || dtorp ) { text } |
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[845cedc] | 67 | |
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[71f4e4f] | 68 | namespace InitTweak { |
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| 69 | namespace { |
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[babeeda] | 70 | struct SelfAssignChecker { |
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| 71 | void previsit( ApplicationExpr * appExpr ); |
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| 72 | }; |
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| 73 | |
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[c0714bf] | 74 | struct InsertImplicitCalls : public WithTypeSubstitution { |
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[adcc065] | 75 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes so that it is easy to identify which |
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| 76 | /// function calls need their parameters to be copy constructed |
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[c0714bf] | 77 | static void insert( std::list< Declaration * > & translationUnit ); |
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[134322e] | 78 | |
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| 79 | Expression * postmutate( ApplicationExpr * appExpr ); |
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[c2931ea] | 80 | }; |
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| 81 | |
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[2f86ddf] | 82 | struct ResolveCopyCtors final : public WithStmtsToAdd, public WithIndexer, public WithShortCircuiting, public WithTypeSubstitution, public WithVisitorRef<ResolveCopyCtors> { |
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[adcc065] | 83 | /// generate temporary ObjectDecls for each argument and return value of each ImplicitCopyCtorExpr, |
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| 84 | /// generate/resolve copy construction expressions for each, and generate/resolve destructors for both |
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| 85 | /// arguments and return value temporaries |
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[2f86ddf] | 86 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit ); |
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[31f379c] | 87 | |
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[2f86ddf] | 88 | Expression * postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 89 | void premutate( StmtExpr * stmtExpr ); |
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| 90 | void premutate( 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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[2f86ddf] | 97 | void destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr, Expression *& arg ); |
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[c2931ea] | 98 | }; |
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| 99 | |
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| 100 | /// collects constructed object decls - used as a base class |
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[698ec72] | 101 | struct ObjDeclCollector : public WithGuards, public WithShortCircuiting { |
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[62423350] | 102 | // use ordered data structure to maintain ordering for set_difference and for consistent error messages |
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| 103 | typedef std::list< ObjectDecl * > ObjectSet; |
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[698ec72] | 104 | void previsit( CompoundStmt *compoundStmt ); |
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| 105 | void previsit( DeclStmt *stmt ); |
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[52c14b3] | 106 | |
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| 107 | // don't go into other functions |
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[698ec72] | 108 | void previsit( FunctionDecl * ) { visit_children = false; } |
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[52c14b3] | 109 | |
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[c2931ea] | 110 | protected: |
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| 111 | ObjectSet curVars; |
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| 112 | }; |
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| 113 | |
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[6cf27a07] | 114 | // debug |
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[62423350] | 115 | template<typename ObjectSet> |
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| 116 | struct PrintSet { |
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| 117 | PrintSet( const ObjectSet & objs ) : objs( objs ) {} |
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[c2931ea] | 118 | const ObjectSet & objs; |
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| 119 | }; |
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[62423350] | 120 | template<typename ObjectSet> |
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| 121 | PrintSet<ObjectSet> printSet( const ObjectSet & objs ) { return PrintSet<ObjectSet>( objs ); } |
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| 122 | template<typename ObjectSet> |
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| 123 | std::ostream & operator<<( std::ostream & out, const PrintSet<ObjectSet> & set) { |
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[c2931ea] | 124 | out << "{ "; |
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| 125 | for ( ObjectDecl * obj : set.objs ) { |
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| 126 | out << obj->get_name() << ", " ; |
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[adcc065] | 127 | } // for |
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[c2931ea] | 128 | out << " }"; |
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| 129 | return out; |
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| 130 | } |
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| 131 | |
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[698ec72] | 132 | struct LabelFinder final : public ObjDeclCollector { |
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[c2931ea] | 133 | typedef std::map< Label, ObjectSet > LabelMap; |
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| 134 | // map of Label -> live variables at that label |
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| 135 | LabelMap vars; |
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| 136 | |
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[698ec72] | 137 | typedef ObjDeclCollector Parent; |
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| 138 | using Parent::previsit; |
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| 139 | void previsit( Statement * stmt ); |
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| 140 | |
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| 141 | void previsit( CompoundStmt *compoundStmt ); |
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| 142 | void previsit( DeclStmt *stmt ); |
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[c2931ea] | 143 | }; |
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| 144 | |
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[698ec72] | 145 | struct InsertDtors final : public ObjDeclCollector, public WithStmtsToAdd { |
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[adcc065] | 146 | /// insert destructor calls at the appropriate places. must happen before CtorInit nodes are removed |
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| 147 | /// (currently by FixInit) |
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[c2931ea] | 148 | static void insert( std::list< Declaration * > & translationUnit ); |
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| 149 | |
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| 150 | typedef std::list< ObjectDecl * > OrderedDecls; |
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| 151 | typedef std::list< OrderedDecls > OrderedDeclsStack; |
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| 152 | |
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[698ec72] | 153 | InsertDtors( PassVisitor<LabelFinder> & finder ) : finder( finder ), labelVars( finder.pass.vars ) {} |
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[c2931ea] | 154 | |
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[698ec72] | 155 | typedef ObjDeclCollector Parent; |
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| 156 | using Parent::previsit; |
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[62e5546] | 157 | |
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[698ec72] | 158 | void previsit( FunctionDecl * funcDecl ); |
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[c2931ea] | 159 | |
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[698ec72] | 160 | void previsit( BranchStmt * stmt ); |
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[c2931ea] | 161 | private: |
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| 162 | void handleGoto( BranchStmt * stmt ); |
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| 163 | |
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[698ec72] | 164 | PassVisitor<LabelFinder> & finder; |
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[c2931ea] | 165 | LabelFinder::LabelMap & labelVars; |
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| 166 | OrderedDeclsStack reverseDeclOrder; |
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| 167 | }; |
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| 168 | |
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[0508ab3] | 169 | class FixInit : public WithStmtsToAdd { |
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[c2931ea] | 170 | public: |
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| 171 | /// expand each object declaration to use its constructor after it is declared. |
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| 172 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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| 173 | |
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[aff3af4] | 174 | DeclarationWithType * postmutate( ObjectDecl *objDecl ); |
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[72e9222] | 175 | |
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| 176 | std::list< Declaration * > staticDtorDecls; |
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[c2931ea] | 177 | }; |
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| 178 | |
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[b3fc977] | 179 | struct GenStructMemberCalls final : public WithGuards, public WithShortCircuiting, public WithIndexer, public WithVisitorRef<GenStructMemberCalls> { |
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[c8dfcd3] | 180 | /// generate default/copy ctor and dtor calls for user-defined struct ctor/dtors |
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| 181 | /// for any member that is missing a corresponding ctor/dtor call. |
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| 182 | /// error if a member is used before constructed |
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| 183 | static void generate( std::list< Declaration * > & translationUnit ); |
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[79970ed] | 184 | |
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[b3fc977] | 185 | void premutate( FunctionDecl * funcDecl ); |
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| 186 | DeclarationWithType * postmutate( FunctionDecl * funcDecl ); |
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[79970ed] | 187 | |
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[b3fc977] | 188 | void premutate( MemberExpr * memberExpr ); |
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| 189 | void premutate( ApplicationExpr * appExpr ); |
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[79970ed] | 190 | |
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[b3fc977] | 191 | /// Note: this post mutate used to be in a separate visitor. If this pass breaks, one place to examine is whether it is |
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| 192 | /// okay for this part of the recursion to occur alongside the rest. |
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| 193 | Expression * postmutate( UntypedExpr * expr ); |
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[79970ed] | 194 | |
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[a16764a6] | 195 | SemanticErrorException errors; |
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[79970ed] | 196 | private: |
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[3906301] | 197 | template< typename... Params > |
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[64ac636] | 198 | void emit( CodeLocation, const Params &... params ); |
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[79970ed] | 199 | |
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[b0f601fa] | 200 | FunctionDecl * function = nullptr; |
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[64ac636] | 201 | std::set< DeclarationWithType * > unhandled; |
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| 202 | std::map< DeclarationWithType *, CodeLocation > usedUninit; |
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[b0f601fa] | 203 | ObjectDecl * thisParam = nullptr; |
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[c8dfcd3] | 204 | bool isCtor = false; // true if current function is a constructor |
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[b0f601fa] | 205 | StructDecl * structDecl = nullptr; |
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[c8dfcd3] | 206 | }; |
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| 207 | |
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[696bf6e] | 208 | struct FixCtorExprs final : public WithDeclsToAdd, public WithIndexer { |
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[b6fe7e6] | 209 | /// expands ConstructorExpr nodes into comma expressions, using a temporary for the first argument |
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| 210 | static void fix( std::list< Declaration * > & translationUnit ); |
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| 211 | |
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[696bf6e] | 212 | Expression * postmutate( ConstructorExpr * ctorExpr ); |
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[b6fe7e6] | 213 | }; |
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[ec42ff2e] | 214 | |
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| 215 | struct SplitExpressions : public WithShortCircuiting, public WithTypeSubstitution, public WithStmtsToAdd { |
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| 216 | /// add CompoundStmts around top-level expressions so that temporaries are destroyed in the correct places. |
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| 217 | static void split( std::list< Declaration * > &translationUnit ); |
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| 218 | |
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| 219 | Statement * postmutate( ExprStmt * stmt ); |
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| 220 | void premutate( TupleAssignExpr * expr ); |
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| 221 | }; |
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[c2931ea] | 222 | } // namespace |
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[db4ecc5] | 223 | |
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[1be845b] | 224 | void fix( std::list< Declaration * > & translationUnit, bool inLibrary ) { |
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[babeeda] | 225 | PassVisitor<SelfAssignChecker> checker; |
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| 226 | acceptAll( translationUnit, checker ); |
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| 227 | |
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[6cf27a07] | 228 | // fixes ConstructorInit for global variables. should happen before fixInitializers. |
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[1be845b] | 229 | InitTweak::fixGlobalInit( translationUnit, inLibrary ); |
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[6cf27a07] | 230 | |
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[ec42ff2e] | 231 | // must happen before ResolveCopyCtors because temporaries have to be inserted into the correct scope |
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| 232 | SplitExpressions::split( translationUnit ); |
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| 233 | |
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[c0714bf] | 234 | InsertImplicitCalls::insert( translationUnit ); |
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[c2931ea] | 235 | |
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[2f86ddf] | 236 | // Needs to happen before ResolveCopyCtors, because argument/return temporaries should not be considered in |
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| 237 | // error checking branch statements |
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| 238 | InsertDtors::insert( translationUnit ); |
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[79970ed] | 239 | |
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[2f86ddf] | 240 | ResolveCopyCtors::resolveImplicitCalls( translationUnit ); |
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| 241 | FixInit::fixInitializers( translationUnit ); |
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[c8dfcd3] | 242 | GenStructMemberCalls::generate( translationUnit ); |
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[ae1b9ea] | 243 | |
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[bcc0946] | 244 | // Needs to happen after GenStructMemberCalls, since otherwise member constructors exprs |
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| 245 | // don't have the correct form, and a member can be constructed more than once. |
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[b6fe7e6] | 246 | FixCtorExprs::fix( translationUnit ); |
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[db4ecc5] | 247 | } |
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| 248 | |
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[c2931ea] | 249 | namespace { |
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[bcc0946] | 250 | /// find and return the destructor used in `input`. If `input` is not a simple destructor call, generate a thunk |
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| 251 | /// that wraps the destructor, insert it into `stmtsToAdd` and return the new function declaration |
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| 252 | DeclarationWithType * getDtorFunc( ObjectDecl * objDecl, Statement * input, std::list< Statement * > & stmtsToAdd ) { |
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| 253 | // unwrap implicit statement wrapper |
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| 254 | Statement * dtor = input; |
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| 255 | if ( ImplicitCtorDtorStmt * implicit = dynamic_cast< ImplicitCtorDtorStmt * >( input ) ) { |
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| 256 | // dtor = implicit->callStmt; |
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| 257 | // implicit->callStmt = nullptr; |
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| 258 | } |
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| 259 | assert( dtor ); |
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| 260 | std::list< Expression * > matches; |
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| 261 | collectCtorDtorCalls( dtor, matches ); |
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| 262 | |
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| 263 | if ( dynamic_cast< ExprStmt * >( dtor ) ) { |
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| 264 | // only one destructor call in the expression |
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| 265 | if ( matches.size() == 1 ) { |
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| 266 | DeclarationWithType * func = getFunction( matches.front() ); |
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| 267 | assertf( func, "getFunction failed to find function in %s", toString( matches.front() ).c_str() ); |
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| 268 | |
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| 269 | // cleanup argument must be a function, not an object (including function pointer) |
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| 270 | if ( FunctionDecl * dtorFunc = dynamic_cast< FunctionDecl * > ( func ) ) { |
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| 271 | if ( dtorFunc->type->forall.empty() ) { |
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| 272 | // simple case where the destructor is a monomorphic function call - can simply |
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| 273 | // use that function as the cleanup function. |
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| 274 | delete dtor; |
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| 275 | return func; |
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| 276 | } |
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| 277 | } |
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| 278 | } |
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| 279 | } |
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| 280 | |
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| 281 | // otherwise the cleanup is more complicated - need to build a single argument cleanup function that |
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| 282 | // wraps the more complicated code. |
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| 283 | static UniqueName dtorNamer( "__cleanup_dtor" ); |
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| 284 | FunctionDecl * dtorFunc = FunctionDecl::newFunction( dtorNamer.newName(), SymTab::genDefaultType( objDecl->type->stripReferences(), false ), new CompoundStmt() ); |
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| 285 | stmtsToAdd.push_back( new DeclStmt( dtorFunc ) ); |
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| 286 | |
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| 287 | // the original code contains uses of objDecl - replace them with the newly generated 'this' parameter. |
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| 288 | ObjectDecl * thisParam = getParamThis( dtorFunc->type ); |
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| 289 | Expression * replacement = new VariableExpr( thisParam ); |
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| 290 | |
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| 291 | Type * base = replacement->result->stripReferences(); |
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| 292 | if ( dynamic_cast< ArrayType * >( base ) || dynamic_cast< TupleType * > ( base ) ) { |
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| 293 | // need to cast away reference for array types, since the destructor is generated without the reference type, |
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| 294 | // and for tuple types since tuple indexing does not work directly on a reference |
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| 295 | replacement = new CastExpr( replacement, base->clone() ); |
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| 296 | } |
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| 297 | DeclReplacer::replace( dtor, { std::make_pair( objDecl, replacement ) } ); |
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| 298 | dtorFunc->statements->push_back( strict_dynamic_cast<Statement *>( dtor ) ); |
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| 299 | |
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| 300 | return dtorFunc; |
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| 301 | } |
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| 302 | |
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[ec42ff2e] | 303 | void SplitExpressions::split( std::list< Declaration * > & translationUnit ) { |
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| 304 | PassVisitor<SplitExpressions> splitter; |
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| 305 | mutateAll( translationUnit, splitter ); |
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| 306 | } |
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| 307 | |
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[c0714bf] | 308 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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| 309 | PassVisitor<InsertImplicitCalls> inserter; |
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[c2931ea] | 310 | mutateAll( translationUnit, inserter ); |
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| 311 | } |
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[db4ecc5] | 312 | |
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[2f86ddf] | 313 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit ) { |
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| 314 | PassVisitor<ResolveCopyCtors> resolver; |
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| 315 | mutateAll( translationUnit, resolver ); |
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[c2931ea] | 316 | } |
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[71f4e4f] | 317 | |
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[c2931ea] | 318 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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[aff3af4] | 319 | PassVisitor<FixInit> fixer; |
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[72e9222] | 320 | |
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| 321 | // can't use mutateAll, because need to insert declarations at top-level |
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| 322 | // can't use DeclMutator, because sometimes need to insert IfStmt, etc. |
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[a16764a6] | 323 | SemanticErrorException errors; |
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[72e9222] | 324 | for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
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| 325 | try { |
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[3c398b6] | 326 | maybeMutate( *i, fixer ); |
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[aff3af4] | 327 | translationUnit.splice( i, fixer.pass.staticDtorDecls ); |
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[a16764a6] | 328 | } catch( SemanticErrorException &e ) { |
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[72e9222] | 329 | errors.append( e ); |
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| 330 | } // try |
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| 331 | } // for |
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| 332 | if ( ! errors.isEmpty() ) { |
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| 333 | throw errors; |
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| 334 | } // if |
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[c2931ea] | 335 | } |
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[71f4e4f] | 336 | |
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[c2931ea] | 337 | void InsertDtors::insert( std::list< Declaration * > & translationUnit ) { |
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[698ec72] | 338 | PassVisitor<LabelFinder> finder; |
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| 339 | PassVisitor<InsertDtors> inserter( finder ); |
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[c2931ea] | 340 | acceptAll( translationUnit, inserter ); |
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| 341 | } |
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| 342 | |
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[c8dfcd3] | 343 | void GenStructMemberCalls::generate( std::list< Declaration * > & translationUnit ) { |
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[9a707e4e] | 344 | PassVisitor<GenStructMemberCalls> warner; |
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[b3fc977] | 345 | mutateAll( translationUnit, warner ); |
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[79970ed] | 346 | } |
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| 347 | |
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[b6fe7e6] | 348 | void FixCtorExprs::fix( std::list< Declaration * > & translationUnit ) { |
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[696bf6e] | 349 | PassVisitor<FixCtorExprs> fixer; |
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| 350 | mutateAll( translationUnit, fixer ); |
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[b6fe7e6] | 351 | } |
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| 352 | |
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[ec42ff2e] | 353 | Statement * SplitExpressions::postmutate( ExprStmt * stmt ) { |
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| 354 | // wrap each top-level ExprStmt in a block so that destructors for argument and return temporaries are destroyed |
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| 355 | // in the correct places |
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| 356 | CompoundStmt * ret = new CompoundStmt( { stmt } ); |
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| 357 | return ret; |
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| 358 | } |
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[babeeda] | 359 | |
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[ec42ff2e] | 360 | void SplitExpressions::premutate( TupleAssignExpr * ) { |
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| 361 | // don't do this within TupleAssignExpr, since it is already broken up into multiple expressions |
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| 362 | visit_children = false; |
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| 363 | } |
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[babeeda] | 364 | |
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[ec42ff2e] | 365 | // Relatively simple structural comparison for expressions, needed to determine |
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| 366 | // if two expressions are "the same" (used to determine if self assignment occurs) |
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| 367 | struct StructuralChecker { |
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| 368 | Expression * stripCasts( Expression * expr ) { |
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| 369 | // this might be too permissive. It's possible that only particular casts are relevant. |
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| 370 | while ( CastExpr * cast = dynamic_cast< CastExpr * >( expr ) ) { |
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| 371 | expr = cast->arg; |
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[babeeda] | 372 | } |
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[ec42ff2e] | 373 | return expr; |
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| 374 | } |
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[babeeda] | 375 | |
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[ec42ff2e] | 376 | void previsit( Expression * ) { |
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| 377 | // anything else does not qualify |
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| 378 | isSimilar = false; |
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| 379 | } |
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[babeeda] | 380 | |
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[ec42ff2e] | 381 | template<typename T> |
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| 382 | T * cast( Expression * node ) { |
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| 383 | // all expressions need to ignore casts, so this bit has been factored out |
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| 384 | return dynamic_cast< T * >( stripCasts( node ) ); |
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| 385 | } |
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[babeeda] | 386 | |
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[ec42ff2e] | 387 | // ignore casts |
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| 388 | void previsit( CastExpr * ) {} |
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| 389 | |
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| 390 | void previsit( MemberExpr * memExpr ) { |
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| 391 | if ( MemberExpr * otherMember = cast< MemberExpr >( other ) ) { |
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| 392 | if ( otherMember->member == memExpr->member ) { |
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| 393 | other = otherMember->aggregate; |
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| 394 | return; |
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[babeeda] | 395 | } |
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| 396 | } |
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[ec42ff2e] | 397 | isSimilar = false; |
---|
| 398 | } |
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[babeeda] | 399 | |
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[ec42ff2e] | 400 | void previsit( VariableExpr * varExpr ) { |
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| 401 | if ( VariableExpr * otherVar = cast< VariableExpr >( other ) ) { |
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| 402 | if ( otherVar->var == varExpr->var ) { |
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[babeeda] | 403 | return; |
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| 404 | } |
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| 405 | } |
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[ec42ff2e] | 406 | isSimilar = false; |
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| 407 | } |
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[babeeda] | 408 | |
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[ec42ff2e] | 409 | void previsit( AddressExpr * ) { |
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| 410 | if ( AddressExpr * addrExpr = cast< AddressExpr >( other ) ) { |
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| 411 | other = addrExpr->arg; |
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| 412 | return; |
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| 413 | } |
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| 414 | isSimilar = false; |
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[babeeda] | 415 | } |
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[ec42ff2e] | 416 | |
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| 417 | Expression * other = nullptr; |
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| 418 | bool isSimilar = true; |
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| 419 | }; |
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| 420 | |
---|
| 421 | bool structurallySimilar( Expression * e1, Expression * e2 ) { |
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| 422 | PassVisitor<StructuralChecker> checker; |
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| 423 | checker.pass.other = e2; |
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| 424 | e1->accept( checker ); |
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| 425 | return checker.pass.isSimilar; |
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[babeeda] | 426 | } |
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| 427 | |
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| 428 | void SelfAssignChecker::previsit( ApplicationExpr * appExpr ) { |
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| 429 | DeclarationWithType * function = getFunction( appExpr ); |
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[a0c7d5cc] | 430 | if ( function->name == "?=?" ) { // doesn't use isAssignment, because ?+=?, etc. should not count as self-assignment |
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[babeeda] | 431 | if ( appExpr->args.size() == 2 ) { |
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| 432 | // check for structural similarity (same variable use, ignore casts, etc. - but does not look too deeply, anything looking like a function is off limits) |
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| 433 | if ( structurallySimilar( appExpr->args.front(), appExpr->args.back() ) ) { |
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| 434 | SemanticWarning( appExpr->location, Warning::SelfAssignment, toCString( appExpr->args.front() ) ); |
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| 435 | } |
---|
| 436 | } |
---|
| 437 | } |
---|
| 438 | } |
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| 439 | |
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[134322e] | 440 | Expression * InsertImplicitCalls::postmutate( ApplicationExpr * appExpr ) { |
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[c2931ea] | 441 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
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[be151bf] | 442 | if ( function->var->linkage.is_builtin ) { |
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[c2931ea] | 443 | // optimization: don't need to copy construct in order to call intrinsic functions |
---|
| 444 | return appExpr; |
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| 445 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
---|
| 446 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
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[05807e9] | 447 | assertf( ftype, "Function call without function type: %s", toString( funcDecl ).c_str() ); |
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[be151bf] | 448 | if ( CodeGen::isConstructor( funcDecl->get_name() ) && ftype->parameters.size() == 2 ) { |
---|
| 449 | Type * t1 = getPointerBase( ftype->parameters.front()->get_type() ); |
---|
| 450 | Type * t2 = ftype->parameters.back()->get_type(); |
---|
[0a81c3f] | 451 | assert( t1 ); |
---|
[c2931ea] | 452 | |
---|
[0a81c3f] | 453 | if ( ResolvExpr::typesCompatible( t1, t2, SymTab::Indexer() ) ) { |
---|
[a28bc02] | 454 | // optimization: don't need to copy construct in order to call a copy constructor |
---|
[c2931ea] | 455 | return appExpr; |
---|
[adcc065] | 456 | } // if |
---|
[bff227f] | 457 | } else if ( CodeGen::isDestructor( funcDecl->get_name() ) ) { |
---|
[c2931ea] | 458 | // correctness: never copy construct arguments to a destructor |
---|
[845cedc] | 459 | return appExpr; |
---|
[adcc065] | 460 | } // if |
---|
| 461 | } // if |
---|
| 462 | } // if |
---|
[c2931ea] | 463 | CP_CTOR_PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
---|
| 464 | |
---|
| 465 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
---|
| 466 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
---|
[c0714bf] | 467 | // Move the type substitution to the new top-level, if it is attached to the appExpr. |
---|
[c2931ea] | 468 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
---|
| 469 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
---|
[c0714bf] | 470 | // calls can be resolved. |
---|
[c2931ea] | 471 | assert( env ); |
---|
[c0714bf] | 472 | std::swap( expr->env, appExpr->env ); |
---|
[c2931ea] | 473 | return expr; |
---|
[db4ecc5] | 474 | } |
---|
| 475 | |
---|
[29bc63e] | 476 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { return ! isConstructable( type ); } |
---|
[c2931ea] | 477 | |
---|
[65660bd] | 478 | Expression * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
---|
[c2931ea] | 479 | assert( var ); |
---|
[092528b] | 480 | // arrays are not copy constructed, so this should always be an ExprStmt |
---|
| 481 | ImplicitCtorDtorStmt * stmt = genCtorDtor( fname, var, cpArg ); |
---|
[9fe33947] | 482 | assertf( stmt, "ResolveCopyCtors: genCtorDtor returned nullptr: %s / %s / %s", fname.c_str(), toString( var ).c_str(), toString( cpArg ).c_str() ); |
---|
| 483 | ExprStmt * exprStmt = strict_dynamic_cast< ExprStmt * >( stmt->callStmt ); |
---|
[08da53d] | 484 | Expression * resolved = exprStmt->expr; |
---|
| 485 | exprStmt->expr = nullptr; // take ownership of expr |
---|
[c2931ea] | 486 | |
---|
| 487 | // resolve copy constructor |
---|
[adcc065] | 488 | // should only be one alternative for copy ctor and dtor expressions, since all arguments are fixed |
---|
| 489 | // (VariableExpr and already resolved expression) |
---|
[08da53d] | 490 | CP_CTOR_PRINT( std::cerr << "ResolvingCtorDtor " << resolved << std::endl; ) |
---|
| 491 | ResolvExpr::findVoidExpression( resolved, indexer ); |
---|
[65660bd] | 492 | assert( resolved ); |
---|
[dd05e12] | 493 | if ( resolved->env ) { |
---|
[31f379c] | 494 | // Extract useful information and discard new environments. Keeping them causes problems in PolyMutator passes. |
---|
[dd05e12] | 495 | env->add( *resolved->env ); |
---|
| 496 | delete resolved->env; |
---|
| 497 | resolved->env = nullptr; |
---|
[adcc065] | 498 | } // if |
---|
[092528b] | 499 | delete stmt; |
---|
[7641b6c] | 500 | if ( TupleAssignExpr * assign = dynamic_cast< TupleAssignExpr * >( resolved ) ) { |
---|
| 501 | // fix newly generated StmtExpr |
---|
[2f86ddf] | 502 | premutate( assign->stmtExpr ); |
---|
[7641b6c] | 503 | } |
---|
[c2931ea] | 504 | return resolved; |
---|
[540de412] | 505 | } |
---|
[db4ecc5] | 506 | |
---|
[ae1b9ea] | 507 | void ResolveCopyCtors::copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ) { |
---|
[c2931ea] | 508 | static UniqueName tempNamer("_tmp_cp"); |
---|
[31f379c] | 509 | assert( env ); |
---|
| 510 | CP_CTOR_PRINT( std::cerr << "Type Substitution: " << *env << std::endl; ) |
---|
[d29fa5f] | 511 | assert( arg->result ); |
---|
[ae1b9ea] | 512 | Type * result = arg->result; |
---|
[1132b62] | 513 | if ( skipCopyConstruct( result ) ) return; // skip certain non-copyable types |
---|
| 514 | |
---|
[f5c3b6c] | 515 | // type may involve type variables, so apply type substitution to get temporary variable's actual type, |
---|
| 516 | // since result type may not be substituted (e.g., if the type does not appear in the parameter list) |
---|
[ae1b9ea] | 517 | // Use applyFree so that types bound in function pointers are not substituted, e.g. in forall(dtype T) void (*)(T). |
---|
| 518 | env->applyFree( result ); |
---|
[3aeaecd] | 519 | ObjectDecl * tmp = ObjectDecl::newObject( "__tmp", result, nullptr ); |
---|
[615a096] | 520 | tmp->get_type()->set_const( false ); |
---|
[1132b62] | 521 | |
---|
| 522 | // create and resolve copy constructor |
---|
| 523 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for an argument" << std::endl; ) |
---|
[65660bd] | 524 | Expression * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
---|
| 525 | |
---|
| 526 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( cpCtor ) ) { |
---|
| 527 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
---|
| 528 | // don't create the temporary and don't call the copy constructor |
---|
[ae1b9ea] | 529 | VariableExpr * function = strict_dynamic_cast< VariableExpr * >( appExpr->function ); |
---|
| 530 | if ( function->var->linkage == LinkageSpec::Intrinsic ) { |
---|
| 531 | // arguments that need to be boxed need a temporary regardless of whether the copy constructor is intrinsic, |
---|
| 532 | // so that the object isn't changed inside of the polymorphic function |
---|
| 533 | if ( ! GenPoly::needsBoxing( formal, result, impCpCtorExpr->callExpr, env ) ) return; |
---|
[ec42ff2e] | 534 | // xxx - leaking tmp |
---|
[ae1b9ea] | 535 | } |
---|
[65660bd] | 536 | } |
---|
| 537 | |
---|
[3aeaecd] | 538 | // set a unique name for the temporary once it's certain the call is necessary |
---|
| 539 | tmp->name = tempNamer.newName(); |
---|
| 540 | |
---|
[65660bd] | 541 | // replace argument to function call with temporary |
---|
[2f86ddf] | 542 | stmtsToAddBefore.push_back( new DeclStmt( tmp ) ); |
---|
| 543 | arg = cpCtor; |
---|
| 544 | destructRet( tmp, impCpCtorExpr, arg ); |
---|
| 545 | |
---|
| 546 | // impCpCtorExpr->dtors.push_front( makeCtorDtor( "^?{}", tmp ) ); |
---|
[1132b62] | 547 | } |
---|
[c2931ea] | 548 | |
---|
[2f86ddf] | 549 | void ResolveCopyCtors::destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr, Expression *& arg ) { |
---|
| 550 | // TODO: refactor code for generating cleanup attribute, since it's common and reused in ~3-4 places |
---|
| 551 | // check for existing cleanup attribute before adding another(?) |
---|
| 552 | // need to add __Destructor for _tmp_cp variables as well |
---|
| 553 | |
---|
| 554 | assertf( Validate::dtorStruct && Validate::dtorStruct->members.size() == 2, "Destructor generation requires __Destructor definition." ); |
---|
| 555 | assertf( Validate::dtorStructDestroy, "Destructor generation requires __destroy_Destructor." ); |
---|
| 556 | |
---|
| 557 | // generate a __Destructor for ret that calls the destructor |
---|
| 558 | Expression * dtor = makeCtorDtor( "^?{}", ret ); |
---|
| 559 | |
---|
[9b086ca] | 560 | // if the chosen destructor is intrinsic, elide the generated dtor handler |
---|
| 561 | if ( arg && isIntrinsicCallExpr( dtor ) ) { |
---|
| 562 | arg = new CommaExpr( arg, new VariableExpr( ret ) ); |
---|
| 563 | return; |
---|
| 564 | } |
---|
[2f86ddf] | 565 | |
---|
| 566 | if ( ! dtor->env ) dtor->env = maybeClone( env ); |
---|
| 567 | DeclarationWithType * dtorFunc = getDtorFunc( ret, new ExprStmt( dtor ), stmtsToAddBefore ); |
---|
| 568 | |
---|
| 569 | StructInstType * dtorStructType = new StructInstType( Type::Qualifiers(), Validate::dtorStruct ); |
---|
| 570 | dtorStructType->parameters.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) ); |
---|
| 571 | |
---|
| 572 | // cast destructor pointer to void (*)(void *), to silence GCC incompatible pointer warnings |
---|
| 573 | FunctionType * dtorFtype = new FunctionType( Type::Qualifiers(), false ); |
---|
| 574 | dtorFtype->parameters.push_back( ObjectDecl::newObject( "", new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), nullptr ) ); |
---|
| 575 | Type * dtorType = new PointerType( Type::Qualifiers(), dtorFtype ); |
---|
| 576 | |
---|
| 577 | static UniqueName namer( "_ret_dtor" ); |
---|
| 578 | ObjectDecl * retDtor = ObjectDecl::newObject( namer.newName(), dtorStructType, new ListInit( { new SingleInit( new ConstantExpr( Constant::null() ) ), new SingleInit( new CastExpr( new VariableExpr( dtorFunc ), dtorType ) ) } ) ); |
---|
| 579 | retDtor->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( Validate::dtorStructDestroy ) } ) ); |
---|
| 580 | stmtsToAddBefore.push_back( new DeclStmt( retDtor ) ); |
---|
| 581 | |
---|
| 582 | if ( arg ) { |
---|
| 583 | Expression * member = new MemberExpr( strict_dynamic_cast<DeclarationWithType *>( Validate::dtorStruct->members.front() ), new VariableExpr( retDtor ) ); |
---|
| 584 | Expression * object = new CastExpr( new AddressExpr( new VariableExpr( ret ) ), new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ) ); |
---|
| 585 | Expression * assign = createBitwiseAssignment( member, object ); |
---|
| 586 | arg = new CommaExpr( new CommaExpr( arg, assign ), new VariableExpr( ret ) ); |
---|
| 587 | } |
---|
| 588 | |
---|
| 589 | // impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
---|
[1132b62] | 590 | } |
---|
| 591 | |
---|
[2f86ddf] | 592 | Expression * ResolveCopyCtors::postmutate( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
---|
[c2931ea] | 593 | CP_CTOR_PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 594 | |
---|
[ae1b9ea] | 595 | ApplicationExpr * appExpr = impCpCtorExpr->callExpr; |
---|
[2f86ddf] | 596 | ObjectDecl * returnDecl = nullptr; |
---|
[c2931ea] | 597 | |
---|
| 598 | // take each argument and attempt to copy construct it. |
---|
[ae1b9ea] | 599 | FunctionType * ftype = GenPoly::getFunctionType( appExpr->function->result ); |
---|
| 600 | assert( ftype ); |
---|
| 601 | auto & params = ftype->parameters; |
---|
| 602 | auto iter = params.begin(); |
---|
| 603 | for ( Expression * & arg : appExpr->args ) { |
---|
| 604 | Type * formal = nullptr; |
---|
[2f86ddf] | 605 | if ( iter != params.end() ) { // does not copy construct C-style variadic arguments |
---|
[ae1b9ea] | 606 | DeclarationWithType * param = *iter++; |
---|
| 607 | formal = param->get_type(); |
---|
| 608 | } |
---|
| 609 | |
---|
| 610 | copyConstructArg( arg, impCpCtorExpr, formal ); |
---|
[adcc065] | 611 | } // for |
---|
[db4ecc5] | 612 | |
---|
[adcc065] | 613 | // each return value from the call needs to be connected with an ObjectDecl at the call site, which is |
---|
| 614 | // initialized with the return value and is destructed later |
---|
[31f379c] | 615 | // xxx - handle named return values? |
---|
[ae1b9ea] | 616 | Type * result = appExpr->result; |
---|
[906e24d] | 617 | if ( ! result->isVoid() ) { |
---|
[1132b62] | 618 | static UniqueName retNamer("_tmp_cp_ret"); |
---|
[c2931ea] | 619 | result = result->clone(); |
---|
[31f379c] | 620 | env->apply( result ); |
---|
[3aeaecd] | 621 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
[ae1b9ea] | 622 | ret->type->set_const( false ); |
---|
[2f86ddf] | 623 | returnDecl = ret; |
---|
| 624 | stmtsToAddBefore.push_back( new DeclStmt( ret ) ); |
---|
[c2931ea] | 625 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
---|
[2f86ddf] | 626 | } // for |
---|
| 627 | CP_CTOR_PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
---|
| 628 | // ------------------------------------------------------ |
---|
| 629 | |
---|
| 630 | CP_CTOR_PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
---|
| 631 | |
---|
| 632 | // detach fields from wrapper node so that it can be deleted without deleting too much |
---|
| 633 | impCpCtorExpr->callExpr = nullptr; |
---|
| 634 | std::swap( impCpCtorExpr->env, appExpr->env ); |
---|
| 635 | assert( impCpCtorExpr->env == nullptr ); |
---|
| 636 | delete impCpCtorExpr; |
---|
| 637 | |
---|
| 638 | if ( returnDecl ) { |
---|
| 639 | Expression * assign = createBitwiseAssignment( new VariableExpr( returnDecl ), appExpr ); |
---|
[0a81c3f] | 640 | if ( ! dynamic_cast< ReferenceType * >( result ) ) { |
---|
[3aeaecd] | 641 | // destructing reference returns is bad because it can cause multiple destructor calls to the same object - the returned object is not a temporary |
---|
[2f86ddf] | 642 | destructRet( returnDecl, impCpCtorExpr, assign ); |
---|
| 643 | } else { |
---|
| 644 | assign = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
---|
[dc86541] | 645 | } |
---|
[2f86ddf] | 646 | // move env from appExpr to retExpr |
---|
| 647 | std::swap( assign->env, appExpr->env ); |
---|
| 648 | return assign; |
---|
| 649 | } else { |
---|
| 650 | return appExpr; |
---|
| 651 | } // if |
---|
[db4ecc5] | 652 | } |
---|
| 653 | |
---|
[2f86ddf] | 654 | void ResolveCopyCtors::premutate( StmtExpr * stmtExpr ) { |
---|
| 655 | // function call temporaries should be placed at statement-level, rather than nested inside of a new statement expression, |
---|
| 656 | // since temporaries can be shared across sub-expressions, e.g. |
---|
| 657 | // [A, A] f(); |
---|
| 658 | // g([A] x, [A] y); |
---|
| 659 | // g(f()); |
---|
| 660 | // f is executed once, so the return temporary is shared across the tuple constructors for x and y. |
---|
| 661 | // Explicitly mutating children instead of mutating the inner compound statement forces the temporaries to be added |
---|
| 662 | // to the outer context, rather than inside of the statement expression. |
---|
| 663 | visit_children = false; |
---|
| 664 | |
---|
[c0714bf] | 665 | assert( env ); |
---|
[2f86ddf] | 666 | |
---|
| 667 | // visit all statements |
---|
| 668 | std::list< Statement * > & stmts = stmtExpr->statements->get_kids(); |
---|
| 669 | for ( Statement *& stmt : stmts ) { |
---|
| 670 | stmt = stmt->acceptMutator( *visitor ); |
---|
| 671 | } // for |
---|
| 672 | |
---|
| 673 | assert( stmtExpr->result ); |
---|
| 674 | Type * result = stmtExpr->result; |
---|
[31f379c] | 675 | if ( ! result->isVoid() ) { |
---|
| 676 | static UniqueName retNamer("_tmp_stmtexpr_ret"); |
---|
| 677 | |
---|
| 678 | result = result->clone(); |
---|
| 679 | env->apply( result ); |
---|
[6dfa2e1] | 680 | if ( ! InitTweak::isConstructable( result ) ) { |
---|
| 681 | delete result; |
---|
| 682 | return; |
---|
| 683 | } |
---|
| 684 | |
---|
| 685 | // create variable that will hold the result of the stmt expr |
---|
[3aeaecd] | 686 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
[7641b6c] | 687 | ret->type->set_const( false ); |
---|
[2f86ddf] | 688 | stmtsToAddBefore.push_back( new DeclStmt( ret ) ); |
---|
[31f379c] | 689 | |
---|
| 690 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
[7641b6c] | 691 | CompoundStmt * body = stmtExpr->statements; |
---|
[2f86ddf] | 692 | assert( ! body->kids.empty() ); |
---|
[31f379c] | 693 | // must be an ExprStmt, otherwise it wouldn't have a result |
---|
[2f86ddf] | 694 | ExprStmt * last = strict_dynamic_cast< ExprStmt * >( body->kids.back() ); |
---|
| 695 | last->expr = makeCtorDtor( "?{}", ret, last->expr ); |
---|
[31f379c] | 696 | |
---|
[2f86ddf] | 697 | // add destructors after current statement |
---|
| 698 | stmtsToAddAfter.push_back( new ExprStmt( makeCtorDtor( "^?{}", ret ) ) ); |
---|
| 699 | |
---|
| 700 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
| 701 | assert( ! stmts.empty() ); |
---|
| 702 | |
---|
| 703 | // if there is a return decl, add a use as the last statement; will not have return decl on non-constructable returns |
---|
| 704 | stmts.push_back( new ExprStmt( new VariableExpr( ret ) ) ); |
---|
[31f379c] | 705 | } // if |
---|
| 706 | |
---|
[2f86ddf] | 707 | assert( stmtExpr->returnDecls.empty() ); |
---|
| 708 | assert( stmtExpr->dtors.empty() ); |
---|
[c0714bf] | 709 | } |
---|
| 710 | |
---|
[ddae809] | 711 | // to prevent warnings (‘_unq0’ may be used uninitialized in this function), |
---|
| 712 | // insert an appropriate zero initializer for UniqueExpr temporaries. |
---|
| 713 | Initializer * makeInit( Type * t ) { |
---|
| 714 | if ( StructInstType * inst = dynamic_cast< StructInstType * >( t ) ) { |
---|
| 715 | // initizer for empty struct must be empty |
---|
| 716 | if ( inst->baseStruct->members.empty() ) return new ListInit({}); |
---|
| 717 | } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( t ) ) { |
---|
| 718 | // initizer for empty union must be empty |
---|
| 719 | if ( inst->baseUnion->members.empty() ) return new ListInit({}); |
---|
| 720 | } |
---|
| 721 | |
---|
| 722 | return new ListInit( { new SingleInit( new ConstantExpr( Constant::from_int( 0 ) ) ) } ); |
---|
| 723 | } |
---|
| 724 | |
---|
[2f86ddf] | 725 | void ResolveCopyCtors::premutate( UniqueExpr * unqExpr ) { |
---|
[dc2334c] | 726 | visit_children = false; |
---|
[2f86ddf] | 727 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 728 | static std::unordered_map< int, UniqueExpr * > unqMap; |
---|
| 729 | if ( ! unqMap.count( unqExpr->get_id() ) ) { |
---|
| 730 | // resolve expr and find its |
---|
| 731 | |
---|
| 732 | ImplicitCopyCtorExpr * impCpCtorExpr = dynamic_cast< ImplicitCopyCtorExpr * >( unqExpr->expr ); |
---|
| 733 | // PassVisitor<ResolveCopyCtors> fixer; |
---|
| 734 | unqExpr->expr = unqExpr->expr->acceptMutator( *visitor ); |
---|
| 735 | |
---|
| 736 | // it should never be necessary to wrap a void-returning expression in a UniqueExpr - if this assumption changes, this needs to be rethought |
---|
| 737 | assert( unqExpr->result ); |
---|
| 738 | if ( impCpCtorExpr ) { |
---|
| 739 | CommaExpr * comma = strict_dynamic_cast< CommaExpr * >( unqExpr->expr ); |
---|
| 740 | VariableExpr * var = strict_dynamic_cast<VariableExpr *>( comma->arg2 ); |
---|
| 741 | // note the variable used as the result from the call |
---|
| 742 | unqExpr->var = var->clone(); |
---|
| 743 | } else { |
---|
| 744 | // expr isn't a call expr, so create a new temporary variable to use to hold the value of the unique expression |
---|
| 745 | unqExpr->object = ObjectDecl::newObject( toString("_unq", unqExpr->get_id()), unqExpr->result->clone(), makeInit( unqExpr->result ) ); |
---|
| 746 | unqExpr->var = new VariableExpr( unqExpr->object ); |
---|
[6dfa2e1] | 747 | } |
---|
[31f379c] | 748 | |
---|
[2f86ddf] | 749 | // stmtsToAddBefore.splice( stmtsToAddBefore.end(), fixer.pass.stmtsToAddBefore ); |
---|
| 750 | // stmtsToAddAfter.splice( stmtsToAddAfter.end(), fixer.pass.stmtsToAddAfter ); |
---|
| 751 | unqMap[unqExpr->get_id()] = unqExpr; |
---|
| 752 | } else { |
---|
[141b786] | 753 | // take data from other UniqueExpr to ensure consistency |
---|
| 754 | delete unqExpr->get_expr(); |
---|
[2f86ddf] | 755 | unqExpr->expr = unqMap[unqExpr->get_id()]->expr->clone(); |
---|
| 756 | delete unqExpr->result; |
---|
| 757 | unqExpr->result = maybeClone( unqExpr->expr->result ); |
---|
[141b786] | 758 | } |
---|
| 759 | } |
---|
| 760 | |
---|
[1bc749f] | 761 | DeclarationWithType * FixInit::postmutate( ObjectDecl *objDecl ) { |
---|
[aff3af4] | 762 | // since this removes the init field from objDecl, it must occur after children are mutated (i.e. postmutate) |
---|
[c2931ea] | 763 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 764 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 765 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 766 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
---|
[08d5507b] | 767 | if ( objDecl->get_storageClasses().is_static ) { |
---|
[72e9222] | 768 | // originally wanted to take advantage of gcc nested functions, but |
---|
[f9cebb5] | 769 | // we get memory errors with this approach. To remedy this, the static |
---|
| 770 | // variable is hoisted when the destructor needs to be called. |
---|
[72e9222] | 771 | // |
---|
[c2931ea] | 772 | // generate: |
---|
[f9cebb5] | 773 | // static T __objName_static_varN; |
---|
[72e9222] | 774 | // void __objName_dtor_atexitN() { |
---|
[f9cebb5] | 775 | // __dtor__...; |
---|
[72e9222] | 776 | // } |
---|
| 777 | // int f(...) { |
---|
| 778 | // ... |
---|
| 779 | // static bool __objName_uninitialized = true; |
---|
| 780 | // if (__objName_uninitialized) { |
---|
| 781 | // __ctor(__objName); |
---|
| 782 | // __objName_uninitialized = false; |
---|
[f9cebb5] | 783 | // atexit(__objName_dtor_atexitN); |
---|
[c2931ea] | 784 | // } |
---|
[72e9222] | 785 | // ... |
---|
[c2931ea] | 786 | // } |
---|
| 787 | |
---|
[72e9222] | 788 | static UniqueName dtorCallerNamer( "_dtor_atexit" ); |
---|
| 789 | |
---|
| 790 | // static bool __objName_uninitialized = true |
---|
[c2931ea] | 791 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
---|
[579263a] | 792 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant::from_int( 1 ) ) ); |
---|
[68fe077a] | 793 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
---|
[c2931ea] | 794 | isUninitializedVar->fixUniqueId(); |
---|
| 795 | |
---|
| 796 | // __objName_uninitialized = false; |
---|
| 797 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 798 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
---|
[d56e5bc] | 799 | setTrue->get_args().push_back( new ConstantExpr( Constant::from_int( 0 ) ) ); |
---|
[c2931ea] | 800 | |
---|
| 801 | // generate body of if |
---|
[ba3706f] | 802 | CompoundStmt * initStmts = new CompoundStmt(); |
---|
[c2931ea] | 803 | std::list< Statement * > & body = initStmts->get_kids(); |
---|
| 804 | body.push_back( ctor ); |
---|
[ba3706f] | 805 | body.push_back( new ExprStmt( setTrue ) ); |
---|
[c2931ea] | 806 | |
---|
| 807 | // put it all together |
---|
[ba3706f] | 808 | IfStmt * ifStmt = new IfStmt( new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
---|
| 809 | stmtsToAddAfter.push_back( new DeclStmt( isUninitializedVar ) ); |
---|
[c2931ea] | 810 | stmtsToAddAfter.push_back( ifStmt ); |
---|
[72e9222] | 811 | |
---|
[a4dd728] | 812 | Statement * dtor = ctorInit->get_dtor(); |
---|
[62423350] | 813 | objDecl->set_init( nullptr ); |
---|
| 814 | ctorInit->set_ctor( nullptr ); |
---|
[a4dd728] | 815 | ctorInit->set_dtor( nullptr ); |
---|
| 816 | if ( dtor ) { |
---|
[f9cebb5] | 817 | // if the object has a non-trivial destructor, have to |
---|
| 818 | // hoist it and the object into the global space and |
---|
| 819 | // call the destructor function with atexit. |
---|
| 820 | |
---|
[a4dd728] | 821 | Statement * dtorStmt = dtor->clone(); |
---|
[f9cebb5] | 822 | |
---|
| 823 | // void __objName_dtor_atexitN(...) {...} |
---|
[ba3706f] | 824 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + dtorCallerNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt() ); |
---|
[f9cebb5] | 825 | dtorCaller->fixUniqueId(); |
---|
[c8dfcd3] | 826 | dtorCaller->get_statements()->push_back( dtorStmt ); |
---|
[f9cebb5] | 827 | |
---|
| 828 | // atexit(dtor_atexit); |
---|
| 829 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
---|
| 830 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
---|
| 831 | |
---|
[ba3706f] | 832 | body.push_back( new ExprStmt( callAtexit ) ); |
---|
[f9cebb5] | 833 | |
---|
| 834 | // hoist variable and dtor caller decls to list of decls that will be added into global scope |
---|
| 835 | staticDtorDecls.push_back( objDecl ); |
---|
| 836 | staticDtorDecls.push_back( dtorCaller ); |
---|
| 837 | |
---|
| 838 | // need to rename object uniquely since it now appears |
---|
| 839 | // at global scope and there could be multiple function-scoped |
---|
| 840 | // static variables with the same name in different functions. |
---|
[c8dfcd3] | 841 | // Note: it isn't sufficient to modify only the mangleName, because |
---|
| 842 | // then subsequent Indexer passes can choke on seeing the object's name |
---|
| 843 | // if another object has the same name and type. An unfortunate side-effect |
---|
| 844 | // of renaming the object is that subsequent NameExprs may fail to resolve, |
---|
| 845 | // but there shouldn't be any remaining past this point. |
---|
[f9cebb5] | 846 | static UniqueName staticNamer( "_static_var" ); |
---|
[c8dfcd3] | 847 | objDecl->set_name( objDecl->get_name() + staticNamer.newName() ); |
---|
| 848 | objDecl->set_mangleName( SymTab::Mangler::mangle( objDecl ) ); |
---|
[f9cebb5] | 849 | |
---|
| 850 | // xxx - temporary hack: need to return a declaration, but want to hoist the current object out of this scope |
---|
| 851 | // create a new object which is never used |
---|
| 852 | static UniqueName dummyNamer( "_dummy" ); |
---|
[68fe077a] | 853 | 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] | 854 | delete ctorInit; |
---|
[f9cebb5] | 855 | return dummy; |
---|
| 856 | } |
---|
[c2931ea] | 857 | } else { |
---|
[e3e16bc] | 858 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * > ( ctor ); |
---|
[b0f601fa] | 859 | ExprStmt * ctorStmt = dynamic_cast< ExprStmt * >( implicit->callStmt ); |
---|
[233e4d9] | 860 | ApplicationExpr * ctorCall = nullptr; |
---|
[b0f601fa] | 861 | if ( ctorStmt && (ctorCall = isIntrinsicCallExpr( ctorStmt->expr )) && ctorCall->get_args().size() == 2 ) { |
---|
[233e4d9] | 862 | // clean up intrinsic copy constructor calls by making them into SingleInits |
---|
[e41306d] | 863 | Expression * ctorArg = ctorCall->args.back(); |
---|
| 864 | std::swap( ctorArg->env, ctorCall->env ); |
---|
| 865 | objDecl->init = new SingleInit( ctorArg ); |
---|
| 866 | |
---|
[b0f601fa] | 867 | ctorCall->args.pop_back(); |
---|
[233e4d9] | 868 | } else { |
---|
| 869 | stmtsToAddAfter.push_back( ctor ); |
---|
[b0f601fa] | 870 | objDecl->init = nullptr; |
---|
| 871 | ctorInit->ctor = nullptr; |
---|
[233e4d9] | 872 | } |
---|
[1bc749f] | 873 | |
---|
| 874 | Statement * dtor = ctorInit->dtor; |
---|
| 875 | if ( dtor ) { |
---|
| 876 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * >( dtor ); |
---|
| 877 | Statement * dtorStmt = implicit->callStmt; |
---|
[20eacb7] | 878 | |
---|
[1bc749f] | 879 | // don't need to call intrinsic dtor, because it does nothing, but |
---|
| 880 | // non-intrinsic dtors must be called |
---|
| 881 | if ( ! isIntrinsicSingleArgCallStmt( dtorStmt ) ) { |
---|
| 882 | // set dtor location to the object's location for error messages |
---|
[88e79ad] | 883 | DeclarationWithType * dtorFunc = getDtorFunc( objDecl, dtorStmt, stmtsToAddBefore ); |
---|
[1bc749f] | 884 | objDecl->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( dtorFunc ) } ) ); |
---|
| 885 | ctorInit->dtor = nullptr; |
---|
| 886 | } // if |
---|
| 887 | } |
---|
[adcc065] | 888 | } // if |
---|
[b0f601fa] | 889 | } else if ( Initializer * init = ctorInit->init ) { |
---|
| 890 | objDecl->init = init; |
---|
| 891 | ctorInit->init = nullptr; |
---|
[c2931ea] | 892 | } else { |
---|
| 893 | // no constructor and no initializer, which is okay |
---|
[b0f601fa] | 894 | objDecl->init = nullptr; |
---|
[adcc065] | 895 | } // if |
---|
[c2931ea] | 896 | delete ctorInit; |
---|
[adcc065] | 897 | } // if |
---|
[c2931ea] | 898 | return objDecl; |
---|
[db4ecc5] | 899 | } |
---|
| 900 | |
---|
[698ec72] | 901 | void ObjDeclCollector::previsit( CompoundStmt * ) { |
---|
| 902 | GuardValue( curVars ); |
---|
[db4ecc5] | 903 | } |
---|
| 904 | |
---|
[698ec72] | 905 | void ObjDeclCollector::previsit( DeclStmt * stmt ) { |
---|
[4b2589a] | 906 | // keep track of all variables currently in scope |
---|
[c2931ea] | 907 | if ( ObjectDecl * objDecl = dynamic_cast< ObjectDecl * > ( stmt->get_decl() ) ) { |
---|
[62423350] | 908 | curVars.push_back( objDecl ); |
---|
[adcc065] | 909 | } // if |
---|
[db4ecc5] | 910 | } |
---|
| 911 | |
---|
[698ec72] | 912 | void LabelFinder::previsit( Statement * stmt ) { |
---|
[4b2589a] | 913 | // for each label, remember the variables in scope at that label. |
---|
[c2931ea] | 914 | for ( Label l : stmt->get_labels() ) { |
---|
| 915 | vars[l] = curVars; |
---|
[adcc065] | 916 | } // for |
---|
[71f4e4f] | 917 | } |
---|
[f1e012b] | 918 | |
---|
[698ec72] | 919 | void LabelFinder::previsit( CompoundStmt * stmt ) { |
---|
| 920 | previsit( (Statement *)stmt ); |
---|
| 921 | Parent::previsit( stmt ); |
---|
| 922 | } |
---|
| 923 | |
---|
| 924 | void LabelFinder::previsit( DeclStmt * stmt ) { |
---|
| 925 | previsit( (Statement *)stmt ); |
---|
| 926 | Parent::previsit( stmt ); |
---|
| 927 | } |
---|
| 928 | |
---|
| 929 | |
---|
| 930 | void InsertDtors::previsit( FunctionDecl * funcDecl ) { |
---|
[52c14b3] | 931 | // each function needs to have its own set of labels |
---|
[698ec72] | 932 | GuardValue( labelVars ); |
---|
[52c14b3] | 933 | labelVars.clear(); |
---|
[680620d] | 934 | // LabelFinder does not recurse into FunctionDecl, so need to visit |
---|
| 935 | // its children manually. |
---|
[698ec72] | 936 | maybeAccept( funcDecl->type, finder ); |
---|
| 937 | maybeAccept( funcDecl->statements, finder ); |
---|
[52c14b3] | 938 | |
---|
[698ec72] | 939 | // all labels for this function have been collected, insert destructors as appropriate via implicit recursion. |
---|
[52c14b3] | 940 | } |
---|
| 941 | |
---|
[adcc065] | 942 | // Handle break/continue/goto in the same manner as C++. Basic idea: any objects that are in scope at the |
---|
| 943 | // BranchStmt but not at the labelled (target) statement must be destructed. If there are any objects in scope |
---|
| 944 | // at the target location but not at the BranchStmt then those objects would be uninitialized so notify the user |
---|
| 945 | // of the error. See C++ Reference 6.6 Jump Statements for details. |
---|
[c2931ea] | 946 | void InsertDtors::handleGoto( BranchStmt * stmt ) { |
---|
[5809461] | 947 | // can't do anything for computed goto |
---|
| 948 | if ( stmt->computedTarget ) return; |
---|
| 949 | |
---|
| 950 | assertf( stmt->get_target() != "", "BranchStmt missing a label: %s", toString( stmt ).c_str() ); |
---|
[c2931ea] | 951 | // S_L = lvars = set of objects in scope at label definition |
---|
| 952 | // S_G = curVars = set of objects in scope at goto statement |
---|
| 953 | ObjectSet & lvars = labelVars[ stmt->get_target() ]; |
---|
| 954 | |
---|
| 955 | DTOR_PRINT( |
---|
| 956 | std::cerr << "at goto label: " << stmt->get_target().get_name() << std::endl; |
---|
| 957 | std::cerr << "S_G = " << printSet( curVars ) << std::endl; |
---|
| 958 | std::cerr << "S_L = " << printSet( lvars ) << std::endl; |
---|
| 959 | ) |
---|
| 960 | |
---|
| 961 | ObjectSet diff; |
---|
| 962 | // S_L-S_G results in set of objects whose construction is skipped - it's an error if this set is non-empty |
---|
| 963 | std::set_difference( lvars.begin(), lvars.end(), curVars.begin(), curVars.end(), std::inserter( diff, diff.begin() ) ); |
---|
| 964 | DTOR_PRINT( |
---|
| 965 | std::cerr << "S_L-S_G = " << printSet( diff ) << std::endl; |
---|
| 966 | ) |
---|
| 967 | if ( ! diff.empty() ) { |
---|
[a16764a6] | 968 | SemanticError( stmt, std::string("jump to label '") + stmt->get_target().get_name() + "' crosses initialization of " + (*diff.begin())->get_name() + " " ); |
---|
[adcc065] | 969 | } // if |
---|
[c2931ea] | 970 | } |
---|
[39786813] | 971 | |
---|
[698ec72] | 972 | void InsertDtors::previsit( BranchStmt * stmt ) { |
---|
[c2931ea] | 973 | switch( stmt->get_type() ) { |
---|
[adcc065] | 974 | case BranchStmt::Continue: |
---|
| 975 | case BranchStmt::Break: |
---|
| 976 | // could optimize the break/continue case, because the S_L-S_G check is unnecessary (this set should |
---|
| 977 | // always be empty), but it serves as a small sanity check. |
---|
| 978 | case BranchStmt::Goto: |
---|
| 979 | handleGoto( stmt ); |
---|
| 980 | break; |
---|
| 981 | default: |
---|
| 982 | assert( false ); |
---|
| 983 | } // switch |
---|
[c2931ea] | 984 | } |
---|
[79970ed] | 985 | |
---|
| 986 | bool checkWarnings( FunctionDecl * funcDecl ) { |
---|
| 987 | // only check for warnings if the current function is a user-defined |
---|
| 988 | // constructor or destructor |
---|
| 989 | if ( ! funcDecl ) return false; |
---|
| 990 | if ( ! funcDecl->get_statements() ) return false; |
---|
[bff227f] | 991 | return CodeGen::isCtorDtor( funcDecl->get_name() ) && ! LinkageSpec::isOverridable( funcDecl->get_linkage() ); |
---|
[79970ed] | 992 | } |
---|
| 993 | |
---|
[b3fc977] | 994 | void GenStructMemberCalls::premutate( FunctionDecl * funcDecl ) { |
---|
[b0f601fa] | 995 | GuardValue( function ); |
---|
[9a707e4e] | 996 | GuardValue( unhandled ); |
---|
| 997 | GuardValue( usedUninit ); |
---|
| 998 | GuardValue( thisParam ); |
---|
| 999 | GuardValue( isCtor ); |
---|
| 1000 | GuardValue( structDecl ); |
---|
[a16764a6] | 1001 | errors = SemanticErrorException(); // clear previous errors |
---|
[c8dfcd3] | 1002 | |
---|
| 1003 | // need to start with fresh sets |
---|
| 1004 | unhandled.clear(); |
---|
| 1005 | usedUninit.clear(); |
---|
[79970ed] | 1006 | |
---|
| 1007 | function = funcDecl; |
---|
[bff227f] | 1008 | isCtor = CodeGen::isConstructor( function->get_name() ); |
---|
[c8dfcd3] | 1009 | if ( checkWarnings( function ) ) { |
---|
| 1010 | FunctionType * type = function->get_functionType(); |
---|
[79970ed] | 1011 | assert( ! type->get_parameters().empty() ); |
---|
[e3e16bc] | 1012 | thisParam = strict_dynamic_cast< ObjectDecl * >( type->get_parameters().front() ); |
---|
[0a81c3f] | 1013 | Type * thisType = getPointerBase( thisParam->get_type() ); |
---|
| 1014 | StructInstType * structType = dynamic_cast< StructInstType * >( thisType ); |
---|
[79970ed] | 1015 | if ( structType ) { |
---|
[44f6341] | 1016 | structDecl = structType->get_baseStruct(); |
---|
[79970ed] | 1017 | for ( Declaration * member : structDecl->get_members() ) { |
---|
| 1018 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
---|
| 1019 | // record all of the struct type's members that need to be constructed or |
---|
| 1020 | // destructed by the end of the function |
---|
| 1021 | unhandled.insert( field ); |
---|
| 1022 | } |
---|
| 1023 | } |
---|
| 1024 | } |
---|
| 1025 | } |
---|
[9a707e4e] | 1026 | } |
---|
| 1027 | |
---|
[b3fc977] | 1028 | DeclarationWithType * GenStructMemberCalls::postmutate( FunctionDecl * funcDecl ) { |
---|
[c8dfcd3] | 1029 | // remove the unhandled objects from usedUninit, because a call is inserted |
---|
| 1030 | // to handle them - only objects that are later constructed are used uninitialized. |
---|
[64ac636] | 1031 | std::map< DeclarationWithType *, CodeLocation > diff; |
---|
| 1032 | // need the comparator since usedUninit and unhandled have different types |
---|
| 1033 | struct comp_t { |
---|
| 1034 | typedef decltype(usedUninit)::value_type usedUninit_t; |
---|
| 1035 | typedef decltype(unhandled)::value_type unhandled_t; |
---|
| 1036 | bool operator()(usedUninit_t x, unhandled_t y) { return x.first < y; } |
---|
| 1037 | bool operator()(unhandled_t x, usedUninit_t y) { return x < y.first; } |
---|
| 1038 | } comp; |
---|
| 1039 | std::set_difference( usedUninit.begin(), usedUninit.end(), unhandled.begin(), unhandled.end(), std::inserter( diff, diff.begin() ), comp ); |
---|
| 1040 | for ( auto p : diff ) { |
---|
| 1041 | DeclarationWithType * member = p.first; |
---|
| 1042 | CodeLocation loc = p.second; |
---|
| 1043 | // xxx - make error message better by also tracking the location that the object is constructed at? |
---|
| 1044 | emit( loc, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", member->get_name(), " used before being constructed" ); |
---|
[79970ed] | 1045 | } |
---|
| 1046 | |
---|
[c8dfcd3] | 1047 | if ( ! unhandled.empty() ) { |
---|
[4618319] | 1048 | // need to explicitly re-add function parameters to the indexer in order to resolve copy constructors |
---|
[9a707e4e] | 1049 | auto guard = makeFuncGuard( [this]() { indexer.enterScope(); }, [this]() { indexer.leaveScope(); } ); |
---|
[5fe35d6] | 1050 | indexer.addFunctionType( function->type ); |
---|
[44f6341] | 1051 | |
---|
| 1052 | // need to iterate through members in reverse in order for |
---|
| 1053 | // ctor/dtor statements to come out in the right order |
---|
[1ba88a0] | 1054 | for ( Declaration * member : reverseIterate( structDecl->get_members() ) ) { |
---|
[44f6341] | 1055 | DeclarationWithType * field = dynamic_cast< DeclarationWithType * >( member ); |
---|
| 1056 | // skip non-DWT members |
---|
| 1057 | if ( ! field ) continue; |
---|
[05807e9] | 1058 | // skip non-constructable members |
---|
| 1059 | if ( ! tryConstruct( field ) ) continue; |
---|
[44f6341] | 1060 | // skip handled members |
---|
| 1061 | if ( ! unhandled.count( field ) ) continue; |
---|
| 1062 | |
---|
| 1063 | // insert and resolve default/copy constructor call for each field that's unhandled |
---|
[c8dfcd3] | 1064 | std::list< Statement * > stmt; |
---|
[5fe35d6] | 1065 | Expression * arg2 = nullptr; |
---|
[4d4882a] | 1066 | if ( isCopyConstructor( function ) ) { |
---|
[44f6341] | 1067 | // if copy ctor, need to pass second-param-of-this-function.field |
---|
[4d4882a] | 1068 | std::list< DeclarationWithType * > & params = function->get_functionType()->get_parameters(); |
---|
| 1069 | assert( params.size() == 2 ); |
---|
[44f6341] | 1070 | arg2 = new MemberExpr( field, new VariableExpr( params.back() ) ); |
---|
[4d4882a] | 1071 | } |
---|
| 1072 | InitExpander srcParam( arg2 ); |
---|
[4618319] | 1073 | // cast away reference type and construct field. |
---|
| 1074 | Expression * thisExpr = new CastExpr( new VariableExpr( thisParam ), thisParam->get_type()->stripReferences()->clone() ); |
---|
| 1075 | Expression * memberDest = new MemberExpr( field, thisExpr ); |
---|
| 1076 | SymTab::genImplicitCall( srcParam, memberDest, function->get_name(), back_inserter( stmt ), field, isCtor ); |
---|
[c8dfcd3] | 1077 | |
---|
| 1078 | assert( stmt.size() <= 1 ); |
---|
| 1079 | if ( stmt.size() == 1 ) { |
---|
| 1080 | Statement * callStmt = stmt.front(); |
---|
| 1081 | |
---|
| 1082 | try { |
---|
[b3fc977] | 1083 | callStmt->acceptMutator( *visitor ); |
---|
[c8dfcd3] | 1084 | if ( isCtor ) { |
---|
[88e79ad] | 1085 | function->statements->push_front( callStmt ); |
---|
[b54ad9c] | 1086 | } else { // TODO: don't generate destructor function/object for intrinsic calls |
---|
[c8dfcd3] | 1087 | // destructor statements should be added at the end |
---|
[88e79ad] | 1088 | // function->get_statements()->push_back( callStmt ); |
---|
| 1089 | |
---|
[2bfc6b2] | 1090 | // Optimization: do not need to call intrinsic destructors on members |
---|
| 1091 | if ( isIntrinsicSingleArgCallStmt( callStmt ) ) continue;; |
---|
| 1092 | |
---|
[b54ad9c] | 1093 | // __Destructor _dtor0 = { (void *)&b.a1, (void (*)(void *)_destroy_A }; |
---|
[88e79ad] | 1094 | std::list< Statement * > stmtsToAdd; |
---|
| 1095 | |
---|
| 1096 | static UniqueName memberDtorNamer = { "__memberDtor" }; |
---|
[2bfc6b2] | 1097 | assertf( Validate::dtorStruct, "builtin __Destructor not found." ); |
---|
| 1098 | assertf( Validate::dtorStructDestroy, "builtin __destroy_Destructor not found." ); |
---|
[88e79ad] | 1099 | |
---|
[b54ad9c] | 1100 | Expression * thisExpr = new CastExpr( new AddressExpr( new VariableExpr( thisParam ) ), new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ) ); |
---|
[88e79ad] | 1101 | Expression * dtorExpr = new VariableExpr( getDtorFunc( thisParam, callStmt, stmtsToAdd ) ); |
---|
| 1102 | |
---|
[10dc6908] | 1103 | // cast destructor pointer to void (*)(void *), to silence GCC incompatible pointer warnings |
---|
| 1104 | FunctionType * dtorFtype = new FunctionType( Type::Qualifiers(), false ); |
---|
| 1105 | dtorFtype->parameters.push_back( ObjectDecl::newObject( "", new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), nullptr ) ); |
---|
| 1106 | Type * dtorType = new PointerType( Type::Qualifiers(), dtorFtype ); |
---|
| 1107 | |
---|
[2bfc6b2] | 1108 | ObjectDecl * destructor = ObjectDecl::newObject( memberDtorNamer.newName(), new StructInstType( Type::Qualifiers(), Validate::dtorStruct ), new ListInit( { new SingleInit( thisExpr ), new SingleInit( new CastExpr( dtorExpr, dtorType ) ) } ) ); |
---|
[f9feab8] | 1109 | function->statements->push_front( new DeclStmt( destructor ) ); |
---|
[2bfc6b2] | 1110 | destructor->attributes.push_back( new Attribute( "cleanup", { new VariableExpr( Validate::dtorStructDestroy ) } ) ); |
---|
[88e79ad] | 1111 | |
---|
| 1112 | function->statements->kids.splice( function->statements->kids.begin(), stmtsToAdd ); |
---|
[c8dfcd3] | 1113 | } |
---|
[a16764a6] | 1114 | } catch ( SemanticErrorException & error ) { |
---|
[64ac636] | 1115 | 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] | 1116 | } |
---|
| 1117 | } |
---|
| 1118 | } |
---|
| 1119 | } |
---|
[64ac636] | 1120 | if (! errors.isEmpty()) { |
---|
| 1121 | throw errors; |
---|
| 1122 | } |
---|
[b3fc977] | 1123 | return funcDecl; |
---|
[79970ed] | 1124 | } |
---|
| 1125 | |
---|
[4618319] | 1126 | /// true if expr is effectively just the 'this' parameter |
---|
| 1127 | bool isThisExpression( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1128 | // TODO: there are more complicated ways to pass 'this' to a constructor, e.g. &*, *&, etc. |
---|
| 1129 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
---|
| 1130 | return varExpr->get_var() == thisParam; |
---|
| 1131 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( expr ) ) { |
---|
| 1132 | return isThisExpression( castExpr->get_arg(), thisParam ); |
---|
| 1133 | } |
---|
| 1134 | return false; |
---|
| 1135 | } |
---|
| 1136 | |
---|
| 1137 | /// returns a MemberExpr if expr is effectively just member access on the 'this' parameter, else nullptr |
---|
| 1138 | MemberExpr * isThisMemberExpr( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1139 | if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
---|
| 1140 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1141 | return memberExpr; |
---|
| 1142 | } |
---|
| 1143 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
---|
| 1144 | return isThisMemberExpr( castExpr->get_arg(), thisParam ); |
---|
| 1145 | } |
---|
| 1146 | return nullptr; |
---|
| 1147 | } |
---|
| 1148 | |
---|
[b3fc977] | 1149 | void GenStructMemberCalls::premutate( ApplicationExpr * appExpr ) { |
---|
[9a707e4e] | 1150 | if ( ! checkWarnings( function ) ) { |
---|
| 1151 | visit_children = false; |
---|
| 1152 | return; |
---|
| 1153 | } |
---|
[79970ed] | 1154 | |
---|
| 1155 | std::string fname = getFunctionName( appExpr ); |
---|
[589a70b] | 1156 | if ( fname == function->name ) { |
---|
[79970ed] | 1157 | // call to same kind of function |
---|
[589a70b] | 1158 | Expression * firstParam = appExpr->args.front(); |
---|
[79970ed] | 1159 | |
---|
[4618319] | 1160 | if ( isThisExpression( firstParam, thisParam ) ) { |
---|
[79970ed] | 1161 | // if calling another constructor on thisParam, assume that function handles |
---|
| 1162 | // all members - if it doesn't a warning will appear in that function. |
---|
[4618319] | 1163 | unhandled.clear(); |
---|
| 1164 | } else if ( MemberExpr * memberExpr = isThisMemberExpr( firstParam, thisParam ) ) { |
---|
| 1165 | // if first parameter is a member expression on the this parameter, |
---|
| 1166 | // then remove the member from unhandled set. |
---|
[589a70b] | 1167 | if ( isThisExpression( memberExpr->aggregate, thisParam ) ) { |
---|
| 1168 | unhandled.erase( memberExpr->member ); |
---|
[79970ed] | 1169 | } |
---|
| 1170 | } |
---|
| 1171 | } |
---|
| 1172 | } |
---|
| 1173 | |
---|
[b3fc977] | 1174 | void GenStructMemberCalls::premutate( MemberExpr * memberExpr ) { |
---|
[9a707e4e] | 1175 | if ( ! checkWarnings( function ) || ! isCtor ) { |
---|
| 1176 | visit_children = false; |
---|
| 1177 | return; |
---|
| 1178 | } |
---|
[79970ed] | 1179 | |
---|
[4618319] | 1180 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1181 | if ( unhandled.count( memberExpr->get_member() ) ) { |
---|
| 1182 | // emit a warning because a member was used before it was constructed |
---|
| 1183 | usedUninit.insert( { memberExpr->get_member(), memberExpr->location } ); |
---|
[79970ed] | 1184 | } |
---|
| 1185 | } |
---|
| 1186 | } |
---|
[3906301] | 1187 | |
---|
| 1188 | template< typename Visitor, typename... Params > |
---|
[64ac636] | 1189 | void error( Visitor & v, CodeLocation loc, const Params &... params ) { |
---|
[a16764a6] | 1190 | SemanticErrorException err( loc, toString( params... ) ); |
---|
[64ac636] | 1191 | v.errors.append( err ); |
---|
[3906301] | 1192 | } |
---|
| 1193 | |
---|
| 1194 | template< typename... Params > |
---|
[64ac636] | 1195 | void GenStructMemberCalls::emit( CodeLocation loc, const Params &... params ) { |
---|
[3906301] | 1196 | // toggle warnings vs. errors here. |
---|
| 1197 | // warn( params... ); |
---|
[64ac636] | 1198 | error( *this, loc, params... ); |
---|
[3906301] | 1199 | } |
---|
[c8dfcd3] | 1200 | |
---|
[b3fc977] | 1201 | Expression * GenStructMemberCalls::postmutate( UntypedExpr * untypedExpr ) { |
---|
[08da53d] | 1202 | Expression * newExpr = untypedExpr; |
---|
| 1203 | ResolvExpr::findVoidExpression( newExpr, indexer ); |
---|
| 1204 | return newExpr; |
---|
[c8dfcd3] | 1205 | } |
---|
[b6fe7e6] | 1206 | |
---|
[696bf6e] | 1207 | Expression * FixCtorExprs::postmutate( ConstructorExpr * ctorExpr ) { |
---|
[b6fe7e6] | 1208 | static UniqueName tempNamer( "_tmp_ctor_expr" ); |
---|
[f0121d7] | 1209 | // xxx - is the size check necessary? |
---|
[d29fa5f] | 1210 | assert( ctorExpr->result && ctorExpr->get_result()->size() == 1 ); |
---|
[b7b8674] | 1211 | |
---|
[627f585] | 1212 | // xxx - this can be TupleAssignExpr now. Need to properly handle this case. |
---|
[e3e16bc] | 1213 | ApplicationExpr * callExpr = strict_dynamic_cast< ApplicationExpr * > ( ctorExpr->get_callExpr() ); |
---|
[b6fe7e6] | 1214 | TypeSubstitution * env = ctorExpr->get_env(); |
---|
| 1215 | ctorExpr->set_callExpr( nullptr ); |
---|
| 1216 | ctorExpr->set_env( nullptr ); |
---|
[f5c3b6c] | 1217 | |
---|
| 1218 | // 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. |
---|
| 1219 | ObjectDecl * tmp = ObjectDecl::newObject( tempNamer.newName(), callExpr->args.front()->result->clone(), nullptr ); |
---|
| 1220 | declsToAddBefore.push_back( tmp ); |
---|
[8a6cf7e] | 1221 | delete ctorExpr; |
---|
[b6fe7e6] | 1222 | |
---|
[696bf6e] | 1223 | // build assignment and replace constructor's first argument with new temporary |
---|
[b6fe7e6] | 1224 | Expression *& firstArg = callExpr->get_args().front(); |
---|
[696bf6e] | 1225 | Expression * assign = new UntypedExpr( new NameExpr( "?=?" ), { new AddressExpr( new VariableExpr( tmp ) ), new AddressExpr( firstArg ) } ); |
---|
[8a6cf7e] | 1226 | firstArg = new VariableExpr( tmp ); |
---|
| 1227 | |
---|
[696bf6e] | 1228 | // resolve assignment and dispose of new env |
---|
[08da53d] | 1229 | ResolvExpr::findVoidExpression( assign, indexer ); |
---|
| 1230 | delete assign->env; |
---|
| 1231 | assign->env = nullptr; |
---|
[696bf6e] | 1232 | |
---|
[8a6cf7e] | 1233 | // for constructor expr: |
---|
| 1234 | // T x; |
---|
| 1235 | // x{}; |
---|
| 1236 | // results in: |
---|
| 1237 | // T x; |
---|
| 1238 | // T & tmp; |
---|
| 1239 | // &tmp = &x, ?{}(tmp), tmp |
---|
[08da53d] | 1240 | CommaExpr * commaExpr = new CommaExpr( assign, new CommaExpr( callExpr, new VariableExpr( tmp ) ) ); |
---|
[b6fe7e6] | 1241 | commaExpr->set_env( env ); |
---|
| 1242 | return commaExpr; |
---|
| 1243 | } |
---|
[c2931ea] | 1244 | } // namespace |
---|
[71f4e4f] | 1245 | } // namespace InitTweak |
---|
| 1246 | |
---|
| 1247 | // Local Variables: // |
---|
| 1248 | // tab-width: 4 // |
---|
| 1249 | // mode: c++ // |
---|
| 1250 | // compile-command: "make install" // |
---|
| 1251 | // End: // |
---|