[71f4e4f] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // FixInit.h -- |
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| 8 | // |
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| 9 | // Author : Rob Schluntz |
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| 10 | // Created On : Wed Jan 13 16:29:30 2016 |
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[adcc065] | 11 | // Last Modified By : Peter A. Buhr |
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[d56e5bc] | 12 | // Last Modified On : Wed Jun 21 17:35:05 2017 |
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| 13 | // Update Count : 74 |
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[71f4e4f] | 14 | // |
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[be9288a] | 15 | #include "FixInit.h" |
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[71f4e4f] | 16 | |
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[d180746] | 17 | #include <stddef.h> // for NULL |
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| 18 | #include <algorithm> // for set_difference, copy_if |
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[e3e16bc] | 19 | #include <cassert> // for assert, strict_dynamic_cast |
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[d180746] | 20 | #include <iostream> // for operator<<, ostream, basic_ost... |
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| 21 | #include <iterator> // for insert_iterator, back_inserter |
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| 22 | #include <list> // for _List_iterator, list, list<>::... |
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| 23 | #include <map> // for _Rb_tree_iterator, _Rb_tree_co... |
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| 24 | #include <memory> // for allocator_traits<>::value_type |
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| 25 | #include <set> // for set, set<>::value_type |
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| 26 | #include <unordered_map> // for unordered_map, unordered_map<>... |
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| 27 | #include <unordered_set> // for unordered_set |
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| 28 | #include <utility> // for pair |
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[134322e] | 29 | |
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[d180746] | 30 | #include "CodeGen/GenType.h" // for genPrettyType |
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[bff227f] | 31 | #include "CodeGen/OperatorTable.h" |
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[d180746] | 32 | #include "Common/PassVisitor.h" // for PassVisitor, WithStmtsToAdd |
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| 33 | #include "Common/SemanticError.h" // for SemanticError |
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| 34 | #include "Common/UniqueName.h" // for UniqueName |
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| 35 | #include "Common/utility.h" // for CodeLocation, ValueGuard, toSt... |
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| 36 | #include "FixGlobalInit.h" // for fixGlobalInit |
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| 37 | #include "GenInit.h" // for genCtorDtor |
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| 38 | #include "GenPoly/GenPoly.h" // for getFunctionType |
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| 39 | #include "InitTweak.h" // for getFunctionName, getCallArg |
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| 40 | #include "Parser/LinkageSpec.h" // for C, Spec, Cforall, isBuiltin |
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| 41 | #include "ResolvExpr/Resolver.h" // for findVoidExpression |
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| 42 | #include "ResolvExpr/typeops.h" // for typesCompatible |
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| 43 | #include "SymTab/Autogen.h" // for genImplicitCall |
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| 44 | #include "SymTab/Indexer.h" // for Indexer |
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| 45 | #include "SymTab/Mangler.h" // for Mangler |
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| 46 | #include "SynTree/Attribute.h" // for Attribute |
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| 47 | #include "SynTree/Constant.h" // for Constant |
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| 48 | #include "SynTree/Declaration.h" // for ObjectDecl, FunctionDecl, Decl... |
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| 49 | #include "SynTree/Expression.h" // for UniqueExpr, VariableExpr, Unty... |
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| 50 | #include "SynTree/Initializer.h" // for ConstructorInit, SingleInit |
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| 51 | #include "SynTree/Label.h" // for Label, noLabels, operator< |
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| 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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| 56 | #include "SynTree/Visitor.h" // for acceptAll, maybeAccept |
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[71f4e4f] | 57 | |
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[f0121d7] | 58 | bool ctordtorp = false; // print all debug |
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| 59 | bool ctorp = false; // print ctor debug |
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| 60 | bool cpctorp = false; // print copy ctor debug |
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| 61 | bool dtorp = false; // print dtor debug |
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[845cedc] | 62 | #define PRINT( text ) if ( ctordtorp ) { text } |
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[c2931ea] | 63 | #define CP_CTOR_PRINT( text ) if ( ctordtorp || cpctorp ) { text } |
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| 64 | #define DTOR_PRINT( text ) if ( ctordtorp || dtorp ) { text } |
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[845cedc] | 65 | |
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[71f4e4f] | 66 | namespace InitTweak { |
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| 67 | namespace { |
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[597db97] | 68 | typedef std::unordered_map< int, int > UnqCount; |
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[31f379c] | 69 | |
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[c0714bf] | 70 | struct InsertImplicitCalls : public WithTypeSubstitution { |
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[adcc065] | 71 | /// wrap function application expressions as ImplicitCopyCtorExpr nodes so that it is easy to identify which |
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| 72 | /// function calls need their parameters to be copy constructed |
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[c0714bf] | 73 | static void insert( std::list< Declaration * > & translationUnit ); |
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[134322e] | 74 | |
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| 75 | Expression * postmutate( ApplicationExpr * appExpr ); |
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[c2931ea] | 76 | }; |
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| 77 | |
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[c0714bf] | 78 | struct ResolveCopyCtors final : public WithIndexer, public WithShortCircuiting, public WithTypeSubstitution { |
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[adcc065] | 79 | /// generate temporary ObjectDecls for each argument and return value of each ImplicitCopyCtorExpr, |
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| 80 | /// generate/resolve copy construction expressions for each, and generate/resolve destructors for both |
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| 81 | /// arguments and return value temporaries |
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[c0714bf] | 82 | static void resolveImplicitCalls( std::list< Declaration * > & translationUnit, UnqCount & unqCount ); |
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[c2931ea] | 83 | |
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[c0714bf] | 84 | ResolveCopyCtors( UnqCount & unqCount ) : unqCount( unqCount ) {} |
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[31f379c] | 85 | |
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[c0714bf] | 86 | void postvisit( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 87 | void postvisit( StmtExpr * stmtExpr ); |
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| 88 | void previsit( UniqueExpr * unqExpr ); |
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| 89 | void postvisit( UniqueExpr * unqExpr ); |
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[c2931ea] | 90 | |
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| 91 | /// create and resolve ctor/dtor expression: fname(var, [cpArg]) |
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[65660bd] | 92 | Expression * makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg = NULL ); |
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[c2931ea] | 93 | /// true if type does not need to be copy constructed to ensure correctness |
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[1132b62] | 94 | bool skipCopyConstruct( Type * type ); |
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[ae1b9ea] | 95 | void copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ); |
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[092528b] | 96 | void destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr ); |
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[31f379c] | 97 | |
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[597db97] | 98 | UnqCount & unqCount; // count the number of times each unique expr ID appears |
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[c0714bf] | 99 | std::unordered_set< int > vars; |
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[c2931ea] | 100 | }; |
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| 101 | |
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| 102 | /// collects constructed object decls - used as a base class |
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[698ec72] | 103 | struct ObjDeclCollector : public WithGuards, public WithShortCircuiting { |
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[62423350] | 104 | // use ordered data structure to maintain ordering for set_difference and for consistent error messages |
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| 105 | typedef std::list< ObjectDecl * > ObjectSet; |
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[698ec72] | 106 | void previsit( CompoundStmt *compoundStmt ); |
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| 107 | void previsit( DeclStmt *stmt ); |
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[52c14b3] | 108 | |
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| 109 | // don't go into other functions |
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[698ec72] | 110 | void previsit( FunctionDecl * ) { visit_children = false; } |
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[52c14b3] | 111 | |
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[c2931ea] | 112 | protected: |
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| 113 | ObjectSet curVars; |
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| 114 | }; |
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| 115 | |
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[6cf27a07] | 116 | // debug |
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[62423350] | 117 | template<typename ObjectSet> |
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| 118 | struct PrintSet { |
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| 119 | PrintSet( const ObjectSet & objs ) : objs( objs ) {} |
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[c2931ea] | 120 | const ObjectSet & objs; |
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| 121 | }; |
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[62423350] | 122 | template<typename ObjectSet> |
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| 123 | PrintSet<ObjectSet> printSet( const ObjectSet & objs ) { return PrintSet<ObjectSet>( objs ); } |
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| 124 | template<typename ObjectSet> |
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| 125 | std::ostream & operator<<( std::ostream & out, const PrintSet<ObjectSet> & set) { |
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[c2931ea] | 126 | out << "{ "; |
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| 127 | for ( ObjectDecl * obj : set.objs ) { |
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| 128 | out << obj->get_name() << ", " ; |
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[adcc065] | 129 | } // for |
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[c2931ea] | 130 | out << " }"; |
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| 131 | return out; |
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| 132 | } |
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| 133 | |
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[698ec72] | 134 | struct LabelFinder final : public ObjDeclCollector { |
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[c2931ea] | 135 | typedef std::map< Label, ObjectSet > LabelMap; |
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| 136 | // map of Label -> live variables at that label |
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| 137 | LabelMap vars; |
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| 138 | |
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[698ec72] | 139 | typedef ObjDeclCollector Parent; |
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| 140 | using Parent::previsit; |
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| 141 | void previsit( Statement * stmt ); |
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| 142 | |
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| 143 | void previsit( CompoundStmt *compoundStmt ); |
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| 144 | void previsit( DeclStmt *stmt ); |
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[c2931ea] | 145 | }; |
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| 146 | |
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[698ec72] | 147 | struct InsertDtors final : public ObjDeclCollector, public WithStmtsToAdd { |
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[adcc065] | 148 | /// insert destructor calls at the appropriate places. must happen before CtorInit nodes are removed |
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| 149 | /// (currently by FixInit) |
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[c2931ea] | 150 | static void insert( std::list< Declaration * > & translationUnit ); |
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| 151 | |
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| 152 | typedef std::list< ObjectDecl * > OrderedDecls; |
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| 153 | typedef std::list< OrderedDecls > OrderedDeclsStack; |
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| 154 | |
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[698ec72] | 155 | InsertDtors( PassVisitor<LabelFinder> & finder ) : finder( finder ), labelVars( finder.pass.vars ) {} |
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[c2931ea] | 156 | |
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[698ec72] | 157 | typedef ObjDeclCollector Parent; |
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| 158 | using Parent::previsit; |
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[62e5546] | 159 | |
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[698ec72] | 160 | void previsit( ObjectDecl * objDecl ); |
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| 161 | void previsit( FunctionDecl * funcDecl ); |
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[c2931ea] | 162 | |
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[698ec72] | 163 | void previsit( CompoundStmt * compoundStmt ); |
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| 164 | void postvisit( CompoundStmt * compoundStmt ); |
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| 165 | void previsit( ReturnStmt * returnStmt ); |
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| 166 | void previsit( BranchStmt * stmt ); |
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[c2931ea] | 167 | private: |
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| 168 | void handleGoto( BranchStmt * stmt ); |
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| 169 | |
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[698ec72] | 170 | PassVisitor<LabelFinder> & finder; |
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[c2931ea] | 171 | LabelFinder::LabelMap & labelVars; |
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| 172 | OrderedDeclsStack reverseDeclOrder; |
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| 173 | }; |
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| 174 | |
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[0508ab3] | 175 | class FixInit : public WithStmtsToAdd { |
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[c2931ea] | 176 | public: |
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| 177 | /// expand each object declaration to use its constructor after it is declared. |
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| 178 | static void fixInitializers( std::list< Declaration * > &translationUnit ); |
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| 179 | |
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[aff3af4] | 180 | DeclarationWithType * postmutate( ObjectDecl *objDecl ); |
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[72e9222] | 181 | |
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| 182 | std::list< Declaration * > staticDtorDecls; |
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[c2931ea] | 183 | }; |
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| 184 | |
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[dc2334c] | 185 | class FixCopyCtors final : public WithStmtsToAdd, public WithShortCircuiting, public WithVisitorRef<FixCopyCtors> { |
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[c2931ea] | 186 | public: |
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[597db97] | 187 | FixCopyCtors( UnqCount & unqCount ) : unqCount( unqCount ){} |
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[adcc065] | 188 | /// expand ImplicitCopyCtorExpr nodes into the temporary declarations, copy constructors, call expression, |
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| 189 | /// and destructors |
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[597db97] | 190 | static void fixCopyCtors( std::list< Declaration * > &translationUnit, UnqCount & unqCount ); |
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[c2931ea] | 191 | |
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[dc2334c] | 192 | Expression * postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ); |
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| 193 | void premutate( StmtExpr * stmtExpr ); |
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| 194 | void premutate( UniqueExpr * unqExpr ); |
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[597db97] | 195 | |
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| 196 | UnqCount & unqCount; |
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[c2931ea] | 197 | }; |
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[79970ed] | 198 | |
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[9a707e4e] | 199 | struct GenStructMemberCalls final : public WithGuards, public WithShortCircuiting, public WithIndexer { |
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[c8dfcd3] | 200 | /// generate default/copy ctor and dtor calls for user-defined struct ctor/dtors |
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| 201 | /// for any member that is missing a corresponding ctor/dtor call. |
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| 202 | /// error if a member is used before constructed |
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| 203 | static void generate( std::list< Declaration * > & translationUnit ); |
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[79970ed] | 204 | |
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[9a707e4e] | 205 | void previsit( FunctionDecl * funcDecl ); |
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| 206 | void postvisit( FunctionDecl * funcDecl ); |
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[79970ed] | 207 | |
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[9a707e4e] | 208 | void previsit( MemberExpr * memberExpr ); |
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| 209 | void previsit( ApplicationExpr * appExpr ); |
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[79970ed] | 210 | |
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[3906301] | 211 | SemanticError errors; |
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[79970ed] | 212 | private: |
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[3906301] | 213 | template< typename... Params > |
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[64ac636] | 214 | void emit( CodeLocation, const Params &... params ); |
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[79970ed] | 215 | |
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[5363fdf] | 216 | FunctionDecl * function = nullptr; |
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[64ac636] | 217 | std::set< DeclarationWithType * > unhandled; |
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| 218 | std::map< DeclarationWithType *, CodeLocation > usedUninit; |
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[5363fdf] | 219 | ObjectDecl * thisParam = nullptr; |
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[c8dfcd3] | 220 | bool isCtor = false; // true if current function is a constructor |
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[5363fdf] | 221 | StructDecl * structDecl = nullptr; |
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[c8dfcd3] | 222 | }; |
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| 223 | |
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| 224 | // very simple resolver-like mutator class - used to |
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| 225 | // resolve UntypedExprs that are found within newly |
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| 226 | // generated constructor/destructor calls |
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[62e5546] | 227 | class MutatingResolver final : public Mutator { |
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[c8dfcd3] | 228 | public: |
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| 229 | MutatingResolver( SymTab::Indexer & indexer ) : indexer( indexer ) {} |
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| 230 | |
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[62e5546] | 231 | using Mutator::mutate; |
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| 232 | virtual DeclarationWithType* mutate( ObjectDecl *objectDecl ) override; |
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| 233 | virtual Expression* mutate( UntypedExpr *untypedExpr ) override; |
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[c8dfcd3] | 234 | |
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[62e5546] | 235 | private: |
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[c8dfcd3] | 236 | SymTab::Indexer & indexer; |
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[79970ed] | 237 | }; |
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[b6fe7e6] | 238 | |
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[696bf6e] | 239 | struct FixCtorExprs final : public WithDeclsToAdd, public WithIndexer { |
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[b6fe7e6] | 240 | /// expands ConstructorExpr nodes into comma expressions, using a temporary for the first argument |
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| 241 | static void fix( std::list< Declaration * > & translationUnit ); |
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| 242 | |
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[696bf6e] | 243 | Expression * postmutate( ConstructorExpr * ctorExpr ); |
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[b6fe7e6] | 244 | }; |
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[c2931ea] | 245 | } // namespace |
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[db4ecc5] | 246 | |
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[6cf27a07] | 247 | void fix( std::list< Declaration * > & translationUnit, const std::string & filename, bool inLibrary ) { |
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| 248 | // fixes ConstructorInit for global variables. should happen before fixInitializers. |
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| 249 | InitTweak::fixGlobalInit( translationUnit, filename, inLibrary ); |
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| 250 | |
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[597db97] | 251 | UnqCount unqCount; |
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[b6fe7e6] | 252 | |
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[c0714bf] | 253 | InsertImplicitCalls::insert( translationUnit ); |
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| 254 | ResolveCopyCtors::resolveImplicitCalls( translationUnit, unqCount ); |
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[c2931ea] | 255 | InsertDtors::insert( translationUnit ); |
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[71f4e4f] | 256 | FixInit::fixInitializers( translationUnit ); |
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[c2931ea] | 257 | |
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[db4ecc5] | 258 | // FixCopyCtors must happen after FixInit, so that destructors are placed correctly |
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[597db97] | 259 | FixCopyCtors::fixCopyCtors( translationUnit, unqCount ); |
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[79970ed] | 260 | |
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[c8dfcd3] | 261 | GenStructMemberCalls::generate( translationUnit ); |
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[ae1b9ea] | 262 | |
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[b6fe7e6] | 263 | // xxx - ctor expansion currently has to be after FixCopyCtors, because there is currently a |
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| 264 | // hack in the way untyped assignments are generated, where the first argument cannot have |
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| 265 | // its address taken because of the way codegeneration handles UntypedExpr vs. ApplicationExpr. |
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| 266 | // Thus such assignment exprs must never pushed through expression resolution (and thus should |
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| 267 | // not go through the FixCopyCtors pass), otherwise they will fail -- guaranteed. |
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| 268 | // Also needs to happen after GenStructMemberCalls, since otherwise member constructors exprs |
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| 269 | // don't look right, and a member can be constructed more than once. |
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| 270 | FixCtorExprs::fix( translationUnit ); |
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[db4ecc5] | 271 | } |
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| 272 | |
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[c2931ea] | 273 | namespace { |
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[c0714bf] | 274 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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| 275 | PassVisitor<InsertImplicitCalls> inserter; |
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[c2931ea] | 276 | mutateAll( translationUnit, inserter ); |
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| 277 | } |
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[db4ecc5] | 278 | |
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[c0714bf] | 279 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit, UnqCount & unqCount ) { |
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| 280 | PassVisitor<ResolveCopyCtors> resolver( unqCount ); |
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[c2931ea] | 281 | acceptAll( translationUnit, resolver ); |
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| 282 | } |
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[71f4e4f] | 283 | |
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[c2931ea] | 284 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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[aff3af4] | 285 | PassVisitor<FixInit> fixer; |
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[72e9222] | 286 | |
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| 287 | // can't use mutateAll, because need to insert declarations at top-level |
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| 288 | // can't use DeclMutator, because sometimes need to insert IfStmt, etc. |
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| 289 | SemanticError errors; |
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| 290 | for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
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| 291 | try { |
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[3c398b6] | 292 | maybeMutate( *i, fixer ); |
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[aff3af4] | 293 | translationUnit.splice( i, fixer.pass.staticDtorDecls ); |
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[72e9222] | 294 | } catch( SemanticError &e ) { |
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[138e29e] | 295 | e.set_location( (*i)->location ); |
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[72e9222] | 296 | errors.append( e ); |
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| 297 | } // try |
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| 298 | } // for |
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| 299 | if ( ! errors.isEmpty() ) { |
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| 300 | throw errors; |
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| 301 | } // if |
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[c2931ea] | 302 | } |
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[71f4e4f] | 303 | |
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[c2931ea] | 304 | void InsertDtors::insert( std::list< Declaration * > & translationUnit ) { |
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[698ec72] | 305 | PassVisitor<LabelFinder> finder; |
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| 306 | PassVisitor<InsertDtors> inserter( finder ); |
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[c2931ea] | 307 | acceptAll( translationUnit, inserter ); |
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| 308 | } |
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| 309 | |
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[597db97] | 310 | void FixCopyCtors::fixCopyCtors( std::list< Declaration * > & translationUnit, UnqCount & unqCount ) { |
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[dc2334c] | 311 | PassVisitor<FixCopyCtors> fixer( unqCount ); |
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[c2931ea] | 312 | mutateAll( translationUnit, fixer ); |
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| 313 | } |
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[db4ecc5] | 314 | |
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[c8dfcd3] | 315 | void GenStructMemberCalls::generate( std::list< Declaration * > & translationUnit ) { |
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[9a707e4e] | 316 | PassVisitor<GenStructMemberCalls> warner; |
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[c8dfcd3] | 317 | acceptAll( translationUnit, warner ); |
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[79970ed] | 318 | } |
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| 319 | |
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[b6fe7e6] | 320 | void FixCtorExprs::fix( std::list< Declaration * > & translationUnit ) { |
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[696bf6e] | 321 | PassVisitor<FixCtorExprs> fixer; |
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| 322 | mutateAll( translationUnit, fixer ); |
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[b6fe7e6] | 323 | } |
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| 324 | |
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[134322e] | 325 | Expression * InsertImplicitCalls::postmutate( ApplicationExpr * appExpr ) { |
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[c2931ea] | 326 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
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[be151bf] | 327 | if ( function->var->linkage.is_builtin ) { |
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[c2931ea] | 328 | // optimization: don't need to copy construct in order to call intrinsic functions |
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| 329 | return appExpr; |
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| 330 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
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| 331 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
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[05807e9] | 332 | assertf( ftype, "Function call without function type: %s", toString( funcDecl ).c_str() ); |
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[be151bf] | 333 | if ( CodeGen::isConstructor( funcDecl->get_name() ) && ftype->parameters.size() == 2 ) { |
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| 334 | Type * t1 = getPointerBase( ftype->parameters.front()->get_type() ); |
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| 335 | Type * t2 = ftype->parameters.back()->get_type(); |
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[0a81c3f] | 336 | assert( t1 ); |
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[c2931ea] | 337 | |
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[0a81c3f] | 338 | if ( ResolvExpr::typesCompatible( t1, t2, SymTab::Indexer() ) ) { |
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[a28bc02] | 339 | // optimization: don't need to copy construct in order to call a copy constructor |
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[c2931ea] | 340 | return appExpr; |
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[adcc065] | 341 | } // if |
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[bff227f] | 342 | } else if ( CodeGen::isDestructor( funcDecl->get_name() ) ) { |
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[c2931ea] | 343 | // correctness: never copy construct arguments to a destructor |
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[845cedc] | 344 | return appExpr; |
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[adcc065] | 345 | } // if |
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| 346 | } // if |
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| 347 | } // if |
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[c2931ea] | 348 | CP_CTOR_PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
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| 349 | |
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| 350 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
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| 351 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
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[c0714bf] | 352 | // Move the type substitution to the new top-level, if it is attached to the appExpr. |
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[c2931ea] | 353 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
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| 354 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
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[c0714bf] | 355 | // calls can be resolved. |
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[c2931ea] | 356 | assert( env ); |
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[c0714bf] | 357 | std::swap( expr->env, appExpr->env ); |
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[c2931ea] | 358 | return expr; |
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[db4ecc5] | 359 | } |
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| 360 | |
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[29bc63e] | 361 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { return ! isConstructable( type ); } |
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[c2931ea] | 362 | |
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[65660bd] | 363 | Expression * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
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[c2931ea] | 364 | assert( var ); |
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[092528b] | 365 | // arrays are not copy constructed, so this should always be an ExprStmt |
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| 366 | ImplicitCtorDtorStmt * stmt = genCtorDtor( fname, var, cpArg ); |
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[e3e16bc] | 367 | ExprStmt * exprStmt = strict_dynamic_cast< ExprStmt * >( stmt->get_callStmt() ); |
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[08da53d] | 368 | Expression * resolved = exprStmt->expr; |
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| 369 | exprStmt->expr = nullptr; // take ownership of expr |
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[c2931ea] | 370 | |
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| 371 | // resolve copy constructor |
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[adcc065] | 372 | // should only be one alternative for copy ctor and dtor expressions, since all arguments are fixed |
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| 373 | // (VariableExpr and already resolved expression) |
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[08da53d] | 374 | CP_CTOR_PRINT( std::cerr << "ResolvingCtorDtor " << resolved << std::endl; ) |
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| 375 | ResolvExpr::findVoidExpression( resolved, indexer ); |
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[65660bd] | 376 | assert( resolved ); |
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[c2931ea] | 377 | if ( resolved->get_env() ) { |
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[31f379c] | 378 | // Extract useful information and discard new environments. Keeping them causes problems in PolyMutator passes. |
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[c2931ea] | 379 | env->add( *resolved->get_env() ); |
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[31f379c] | 380 | delete resolved->get_env(); |
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| 381 | resolved->set_env( nullptr ); |
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[adcc065] | 382 | } // if |
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[092528b] | 383 | delete stmt; |
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[c2931ea] | 384 | return resolved; |
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[540de412] | 385 | } |
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[db4ecc5] | 386 | |
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[ae1b9ea] | 387 | void ResolveCopyCtors::copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr, Type * formal ) { |
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[c2931ea] | 388 | static UniqueName tempNamer("_tmp_cp"); |
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[31f379c] | 389 | assert( env ); |
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| 390 | CP_CTOR_PRINT( std::cerr << "Type Substitution: " << *env << std::endl; ) |
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[d29fa5f] | 391 | assert( arg->result ); |
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[ae1b9ea] | 392 | Type * result = arg->result; |
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[1132b62] | 393 | if ( skipCopyConstruct( result ) ) return; // skip certain non-copyable types |
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| 394 | |
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[ae1b9ea] | 395 | // type may involve type variables, so apply type substitution to get temporary variable's actual type. |
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| 396 | // Use applyFree so that types bound in function pointers are not substituted, e.g. in forall(dtype T) void (*)(T). |
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[1132b62] | 397 | result = result->clone(); |
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[ae1b9ea] | 398 | env->applyFree( result ); |
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[3aeaecd] | 399 | ObjectDecl * tmp = ObjectDecl::newObject( "__tmp", result, nullptr ); |
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[615a096] | 400 | tmp->get_type()->set_const( false ); |
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[1132b62] | 401 | |
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| 402 | // create and resolve copy constructor |
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| 403 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for an argument" << std::endl; ) |
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[65660bd] | 404 | Expression * cpCtor = makeCtorDtor( "?{}", tmp, arg ); |
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| 405 | |
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| 406 | if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( cpCtor ) ) { |
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| 407 | // if the chosen constructor is intrinsic, the copy is unnecessary, so |
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| 408 | // don't create the temporary and don't call the copy constructor |
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[ae1b9ea] | 409 | VariableExpr * function = strict_dynamic_cast< VariableExpr * >( appExpr->function ); |
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| 410 | if ( function->var->linkage == LinkageSpec::Intrinsic ) { |
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| 411 | // arguments that need to be boxed need a temporary regardless of whether the copy constructor is intrinsic, |
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| 412 | // so that the object isn't changed inside of the polymorphic function |
---|
| 413 | if ( ! GenPoly::needsBoxing( formal, result, impCpCtorExpr->callExpr, env ) ) return; |
---|
| 414 | } |
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[65660bd] | 415 | } |
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| 416 | |
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[3aeaecd] | 417 | // set a unique name for the temporary once it's certain the call is necessary |
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| 418 | tmp->name = tempNamer.newName(); |
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| 419 | |
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[65660bd] | 420 | // replace argument to function call with temporary |
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| 421 | arg = new CommaExpr( cpCtor, new VariableExpr( tmp ) ); |
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[ae1b9ea] | 422 | impCpCtorExpr->tempDecls.push_back( tmp ); |
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| 423 | impCpCtorExpr->dtors.push_front( makeCtorDtor( "^?{}", tmp ) ); |
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[1132b62] | 424 | } |
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[c2931ea] | 425 | |
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[092528b] | 426 | void ResolveCopyCtors::destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr ) { |
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| 427 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
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[1132b62] | 428 | } |
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| 429 | |
---|
[c0714bf] | 430 | void ResolveCopyCtors::postvisit( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
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[c2931ea] | 431 | CP_CTOR_PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
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| 432 | |
---|
[ae1b9ea] | 433 | ApplicationExpr * appExpr = impCpCtorExpr->callExpr; |
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[c2931ea] | 434 | |
---|
| 435 | // take each argument and attempt to copy construct it. |
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[ae1b9ea] | 436 | FunctionType * ftype = GenPoly::getFunctionType( appExpr->function->result ); |
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| 437 | assert( ftype ); |
---|
| 438 | auto & params = ftype->parameters; |
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| 439 | auto iter = params.begin(); |
---|
| 440 | for ( Expression * & arg : appExpr->args ) { |
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| 441 | Type * formal = nullptr; |
---|
| 442 | if ( iter != params.end() ) { |
---|
| 443 | DeclarationWithType * param = *iter++; |
---|
| 444 | formal = param->get_type(); |
---|
| 445 | } |
---|
| 446 | |
---|
| 447 | copyConstructArg( arg, impCpCtorExpr, formal ); |
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[adcc065] | 448 | } // for |
---|
[db4ecc5] | 449 | |
---|
[adcc065] | 450 | // each return value from the call needs to be connected with an ObjectDecl at the call site, which is |
---|
| 451 | // initialized with the return value and is destructed later |
---|
[31f379c] | 452 | // xxx - handle named return values? |
---|
[ae1b9ea] | 453 | Type * result = appExpr->result; |
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[906e24d] | 454 | if ( ! result->isVoid() ) { |
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[1132b62] | 455 | static UniqueName retNamer("_tmp_cp_ret"); |
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[c2931ea] | 456 | result = result->clone(); |
---|
[31f379c] | 457 | env->apply( result ); |
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[3aeaecd] | 458 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
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[ae1b9ea] | 459 | ret->type->set_const( false ); |
---|
| 460 | impCpCtorExpr->returnDecls.push_back( ret ); |
---|
[c2931ea] | 461 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
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[0a81c3f] | 462 | if ( ! dynamic_cast< ReferenceType * >( result ) ) { |
---|
[3aeaecd] | 463 | // destructing reference returns is bad because it can cause multiple destructor calls to the same object - the returned object is not a temporary |
---|
[092528b] | 464 | destructRet( ret, impCpCtorExpr ); |
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[dc86541] | 465 | } |
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[adcc065] | 466 | } // for |
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[c2931ea] | 467 | CP_CTOR_PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
---|
[db4ecc5] | 468 | } |
---|
| 469 | |
---|
[c0714bf] | 470 | void ResolveCopyCtors::postvisit( StmtExpr * stmtExpr ) { |
---|
| 471 | assert( env ); |
---|
[31f379c] | 472 | assert( stmtExpr->get_result() ); |
---|
| 473 | Type * result = stmtExpr->get_result(); |
---|
| 474 | if ( ! result->isVoid() ) { |
---|
| 475 | static UniqueName retNamer("_tmp_stmtexpr_ret"); |
---|
| 476 | |
---|
| 477 | // create variable that will hold the result of the stmt expr |
---|
| 478 | result = result->clone(); |
---|
| 479 | env->apply( result ); |
---|
[3aeaecd] | 480 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
---|
[615a096] | 481 | ret->get_type()->set_const( false ); |
---|
[31f379c] | 482 | stmtExpr->get_returnDecls().push_front( ret ); |
---|
| 483 | |
---|
| 484 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
| 485 | CompoundStmt * body = stmtExpr->get_statements(); |
---|
| 486 | assert( ! body->get_kids().empty() ); |
---|
| 487 | // must be an ExprStmt, otherwise it wouldn't have a result |
---|
[e3e16bc] | 488 | ExprStmt * last = strict_dynamic_cast< ExprStmt * >( body->get_kids().back() ); |
---|
[31f379c] | 489 | last->set_expr( makeCtorDtor( "?{}", ret, last->get_expr() ) ); |
---|
| 490 | |
---|
[092528b] | 491 | stmtExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
---|
[31f379c] | 492 | } // if |
---|
| 493 | } |
---|
| 494 | |
---|
[c0714bf] | 495 | void ResolveCopyCtors::previsit( UniqueExpr * unqExpr ) { |
---|
[597db97] | 496 | unqCount[ unqExpr->get_id() ]++; // count the number of unique expressions for each ID |
---|
[c0714bf] | 497 | if ( vars.count( unqExpr->get_id() ) ) { |
---|
| 498 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 499 | visit_children = false; |
---|
| 500 | } |
---|
| 501 | } |
---|
| 502 | |
---|
| 503 | void ResolveCopyCtors::postvisit( UniqueExpr * unqExpr ) { |
---|
[141b786] | 504 | if ( vars.count( unqExpr->get_id() ) ) { |
---|
| 505 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 506 | return; |
---|
| 507 | } |
---|
| 508 | |
---|
| 509 | // it should never be necessary to wrap a void-returning expression in a UniqueExpr - if this assumption changes, this needs to be rethought |
---|
| 510 | assert( unqExpr->get_result() ); |
---|
| 511 | if ( ImplicitCopyCtorExpr * impCpCtorExpr = dynamic_cast<ImplicitCopyCtorExpr*>( unqExpr->get_expr() ) ) { |
---|
| 512 | // note the variable used as the result from the call |
---|
| 513 | assert( impCpCtorExpr->get_result() && impCpCtorExpr->get_returnDecls().size() == 1 ); |
---|
| 514 | unqExpr->set_var( new VariableExpr( impCpCtorExpr->get_returnDecls().front() ) ); |
---|
| 515 | } else { |
---|
| 516 | // expr isn't a call expr, so create a new temporary variable to use to hold the value of the unique expression |
---|
[3aeaecd] | 517 | unqExpr->set_object( ObjectDecl::newObject( toString("_unq", unqExpr->get_id()), unqExpr->get_result()->clone(), nullptr ) ); |
---|
[141b786] | 518 | unqExpr->set_var( new VariableExpr( unqExpr->get_object() ) ); |
---|
| 519 | } |
---|
| 520 | vars.insert( unqExpr->get_id() ); |
---|
| 521 | } |
---|
| 522 | |
---|
[dc2334c] | 523 | Expression * FixCopyCtors::postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
---|
[c2931ea] | 524 | CP_CTOR_PRINT( std::cerr << "FixCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 525 | |
---|
| 526 | std::list< ObjectDecl * > & tempDecls = impCpCtorExpr->get_tempDecls(); |
---|
| 527 | std::list< ObjectDecl * > & returnDecls = impCpCtorExpr->get_returnDecls(); |
---|
| 528 | std::list< Expression * > & dtors = impCpCtorExpr->get_dtors(); |
---|
[845cedc] | 529 | |
---|
[c2931ea] | 530 | // add all temporary declarations and their constructors |
---|
| 531 | for ( ObjectDecl * obj : tempDecls ) { |
---|
[dc2334c] | 532 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[adcc065] | 533 | } // for |
---|
[c2931ea] | 534 | for ( ObjectDecl * obj : returnDecls ) { |
---|
[dc2334c] | 535 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[adcc065] | 536 | } // for |
---|
[db4ecc5] | 537 | |
---|
[c2931ea] | 538 | // add destructors after current statement |
---|
| 539 | for ( Expression * dtor : dtors ) { |
---|
| 540 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
---|
[adcc065] | 541 | } // for |
---|
[db4ecc5] | 542 | |
---|
[c0714bf] | 543 | ObjectDecl * returnDecl = returnDecls.empty() ? nullptr : returnDecls.front(); |
---|
[c2931ea] | 544 | Expression * callExpr = impCpCtorExpr->get_callExpr(); |
---|
| 545 | |
---|
| 546 | CP_CTOR_PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
---|
| 547 | |
---|
| 548 | // detach fields from wrapper node so that it can be deleted without deleting too much |
---|
| 549 | dtors.clear(); |
---|
| 550 | tempDecls.clear(); |
---|
| 551 | returnDecls.clear(); |
---|
[c0714bf] | 552 | impCpCtorExpr->set_callExpr( nullptr ); |
---|
| 553 | std::swap( impCpCtorExpr->env, callExpr->env ); |
---|
| 554 | assert( impCpCtorExpr->env == nullptr ); |
---|
[c2931ea] | 555 | delete impCpCtorExpr; |
---|
| 556 | |
---|
| 557 | if ( returnDecl ) { |
---|
| 558 | UntypedExpr * assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 559 | assign->get_args().push_back( new VariableExpr( returnDecl ) ); |
---|
| 560 | assign->get_args().push_back( callExpr ); |
---|
| 561 | // know the result type of the assignment is the type of the LHS (minus the pointer), so |
---|
| 562 | // add that onto the assignment expression so that later steps have the necessary information |
---|
[906e24d] | 563 | assign->set_result( returnDecl->get_type()->clone() ); |
---|
[c2931ea] | 564 | |
---|
| 565 | Expression * retExpr = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
---|
[31f379c] | 566 | // move env from callExpr to retExpr |
---|
[50377a4] | 567 | std::swap( retExpr->env, callExpr->env ); |
---|
[c2931ea] | 568 | return retExpr; |
---|
| 569 | } else { |
---|
| 570 | return callExpr; |
---|
[adcc065] | 571 | } // if |
---|
[4ffdd63] | 572 | } |
---|
[c2931ea] | 573 | |
---|
[dc2334c] | 574 | void FixCopyCtors::premutate( StmtExpr * stmtExpr ) { |
---|
[65aca88] | 575 | // function call temporaries should be placed at statement-level, rather than nested inside of a new statement expression, |
---|
| 576 | // since temporaries can be shared across sub-expressions, e.g. |
---|
| 577 | // [A, A] f(); |
---|
| 578 | // g([A] x, [A] y); |
---|
[dc2334c] | 579 | // g(f()); |
---|
[65aca88] | 580 | // f is executed once, so the return temporary is shared across the tuple constructors for x and y. |
---|
[dc2334c] | 581 | // Explicitly mutating children instead of mutating the inner compound statment forces the temporaries to be added |
---|
| 582 | // to the outer context, rather than inside of the statement expression. |
---|
| 583 | visit_children = false; |
---|
[65aca88] | 584 | std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids(); |
---|
| 585 | for ( Statement *& stmt : stmts ) { |
---|
[dc2334c] | 586 | stmt = stmt->acceptMutator( *visitor ); |
---|
[65aca88] | 587 | } // for |
---|
[31f379c] | 588 | assert( stmtExpr->get_result() ); |
---|
| 589 | Type * result = stmtExpr->get_result(); |
---|
| 590 | if ( ! result->isVoid() ) { |
---|
| 591 | for ( ObjectDecl * obj : stmtExpr->get_returnDecls() ) { |
---|
[dc2334c] | 592 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[31f379c] | 593 | } // for |
---|
| 594 | // add destructors after current statement |
---|
| 595 | for ( Expression * dtor : stmtExpr->get_dtors() ) { |
---|
| 596 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
---|
| 597 | } // for |
---|
| 598 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
[dc2334c] | 599 | assert( ! stmts.empty() ); |
---|
[31f379c] | 600 | assert( ! stmtExpr->get_returnDecls().empty() ); |
---|
[dc2334c] | 601 | stmts.push_back( new ExprStmt( noLabels, new VariableExpr( stmtExpr->get_returnDecls().front() ) ) ); |
---|
[a28bc02] | 602 | stmtExpr->get_returnDecls().clear(); |
---|
| 603 | stmtExpr->get_dtors().clear(); |
---|
[31f379c] | 604 | } |
---|
[a28bc02] | 605 | assert( stmtExpr->get_returnDecls().empty() ); |
---|
| 606 | assert( stmtExpr->get_dtors().empty() ); |
---|
[31f379c] | 607 | } |
---|
| 608 | |
---|
[dc2334c] | 609 | void FixCopyCtors::premutate( UniqueExpr * unqExpr ) { |
---|
| 610 | visit_children = false; |
---|
[597db97] | 611 | unqCount[ unqExpr->get_id() ]--; |
---|
| 612 | static std::unordered_map< int, std::list< Statement * > > dtors; |
---|
[141b786] | 613 | static std::unordered_map< int, UniqueExpr * > unqMap; |
---|
| 614 | // has to be done to clean up ImplicitCopyCtorExpr nodes, even when this node was skipped in previous passes |
---|
| 615 | if ( unqMap.count( unqExpr->get_id() ) ) { |
---|
| 616 | // take data from other UniqueExpr to ensure consistency |
---|
| 617 | delete unqExpr->get_expr(); |
---|
| 618 | unqExpr->set_expr( unqMap[unqExpr->get_id()]->get_expr()->clone() ); |
---|
| 619 | delete unqExpr->get_result(); |
---|
| 620 | unqExpr->set_result( maybeClone( unqExpr->get_expr()->get_result() ) ); |
---|
[597db97] | 621 | if ( unqCount[ unqExpr->get_id() ] == 0 ) { // insert destructor after the last use of the unique expression |
---|
[edbdbe6] | 622 | stmtsToAddAfter.splice( stmtsToAddAfter.end(), dtors[ unqExpr->get_id() ] ); |
---|
[597db97] | 623 | } |
---|
[dc2334c] | 624 | return; |
---|
[141b786] | 625 | } |
---|
[dc2334c] | 626 | PassVisitor<FixCopyCtors> fixer( unqCount ); |
---|
[597db97] | 627 | unqExpr->set_expr( unqExpr->get_expr()->acceptMutator( fixer ) ); // stmtexprs contained should not be separately fixed, so this must occur after the lookup |
---|
[dc2334c] | 628 | stmtsToAddBefore.splice( stmtsToAddBefore.end(), fixer.pass.stmtsToAddBefore ); |
---|
[141b786] | 629 | unqMap[unqExpr->get_id()] = unqExpr; |
---|
[edbdbe6] | 630 | if ( unqCount[ unqExpr->get_id() ] == 0 ) { // insert destructor after the last use of the unique expression |
---|
| 631 | stmtsToAddAfter.splice( stmtsToAddAfter.end(), dtors[ unqExpr->get_id() ] ); |
---|
| 632 | } else { // remember dtors for last instance of unique expr |
---|
[dc2334c] | 633 | dtors[ unqExpr->get_id() ] = fixer.pass.stmtsToAddAfter; |
---|
[141b786] | 634 | } |
---|
[dc2334c] | 635 | return; |
---|
[141b786] | 636 | } |
---|
| 637 | |
---|
[5363fdf] | 638 | DeclarationWithType * FixInit::postmutate( ObjectDecl *objDecl ) { |
---|
[aff3af4] | 639 | // since this removes the init field from objDecl, it must occur after children are mutated (i.e. postmutate) |
---|
[c2931ea] | 640 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 641 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 642 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 643 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
---|
[08d5507b] | 644 | if ( objDecl->get_storageClasses().is_static ) { |
---|
[72e9222] | 645 | // originally wanted to take advantage of gcc nested functions, but |
---|
[f9cebb5] | 646 | // we get memory errors with this approach. To remedy this, the static |
---|
| 647 | // variable is hoisted when the destructor needs to be called. |
---|
[72e9222] | 648 | // |
---|
[c2931ea] | 649 | // generate: |
---|
[f9cebb5] | 650 | // static T __objName_static_varN; |
---|
[72e9222] | 651 | // void __objName_dtor_atexitN() { |
---|
[f9cebb5] | 652 | // __dtor__...; |
---|
[72e9222] | 653 | // } |
---|
| 654 | // int f(...) { |
---|
| 655 | // ... |
---|
| 656 | // static bool __objName_uninitialized = true; |
---|
| 657 | // if (__objName_uninitialized) { |
---|
| 658 | // __ctor(__objName); |
---|
| 659 | // __objName_uninitialized = false; |
---|
[f9cebb5] | 660 | // atexit(__objName_dtor_atexitN); |
---|
[c2931ea] | 661 | // } |
---|
[72e9222] | 662 | // ... |
---|
[c2931ea] | 663 | // } |
---|
| 664 | |
---|
[72e9222] | 665 | static UniqueName dtorCallerNamer( "_dtor_atexit" ); |
---|
| 666 | |
---|
| 667 | // static bool __objName_uninitialized = true |
---|
[c2931ea] | 668 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
---|
[579263a] | 669 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant::from_int( 1 ) ) ); |
---|
[68fe077a] | 670 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
---|
[c2931ea] | 671 | isUninitializedVar->fixUniqueId(); |
---|
| 672 | |
---|
| 673 | // __objName_uninitialized = false; |
---|
| 674 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 675 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
---|
[d56e5bc] | 676 | setTrue->get_args().push_back( new ConstantExpr( Constant::from_int( 0 ) ) ); |
---|
[c2931ea] | 677 | |
---|
| 678 | // generate body of if |
---|
| 679 | CompoundStmt * initStmts = new CompoundStmt( noLabels ); |
---|
| 680 | std::list< Statement * > & body = initStmts->get_kids(); |
---|
| 681 | body.push_back( ctor ); |
---|
| 682 | body.push_back( new ExprStmt( noLabels, setTrue ) ); |
---|
| 683 | |
---|
| 684 | // put it all together |
---|
| 685 | IfStmt * ifStmt = new IfStmt( noLabels, new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
---|
| 686 | stmtsToAddAfter.push_back( new DeclStmt( noLabels, isUninitializedVar ) ); |
---|
| 687 | stmtsToAddAfter.push_back( ifStmt ); |
---|
[72e9222] | 688 | |
---|
[a4dd728] | 689 | Statement * dtor = ctorInit->get_dtor(); |
---|
[62423350] | 690 | objDecl->set_init( nullptr ); |
---|
| 691 | ctorInit->set_ctor( nullptr ); |
---|
[a4dd728] | 692 | ctorInit->set_dtor( nullptr ); |
---|
| 693 | if ( dtor ) { |
---|
[f9cebb5] | 694 | // if the object has a non-trivial destructor, have to |
---|
| 695 | // hoist it and the object into the global space and |
---|
| 696 | // call the destructor function with atexit. |
---|
| 697 | |
---|
[a4dd728] | 698 | Statement * dtorStmt = dtor->clone(); |
---|
[f9cebb5] | 699 | |
---|
| 700 | // void __objName_dtor_atexitN(...) {...} |
---|
[68fe077a] | 701 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + dtorCallerNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt( noLabels ) ); |
---|
[f9cebb5] | 702 | dtorCaller->fixUniqueId(); |
---|
[c8dfcd3] | 703 | dtorCaller->get_statements()->push_back( dtorStmt ); |
---|
[f9cebb5] | 704 | |
---|
| 705 | // atexit(dtor_atexit); |
---|
| 706 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
---|
| 707 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
---|
| 708 | |
---|
| 709 | body.push_back( new ExprStmt( noLabels, callAtexit ) ); |
---|
| 710 | |
---|
| 711 | // hoist variable and dtor caller decls to list of decls that will be added into global scope |
---|
| 712 | staticDtorDecls.push_back( objDecl ); |
---|
| 713 | staticDtorDecls.push_back( dtorCaller ); |
---|
| 714 | |
---|
| 715 | // need to rename object uniquely since it now appears |
---|
| 716 | // at global scope and there could be multiple function-scoped |
---|
| 717 | // static variables with the same name in different functions. |
---|
[c8dfcd3] | 718 | // Note: it isn't sufficient to modify only the mangleName, because |
---|
| 719 | // then subsequent Indexer passes can choke on seeing the object's name |
---|
| 720 | // if another object has the same name and type. An unfortunate side-effect |
---|
| 721 | // of renaming the object is that subsequent NameExprs may fail to resolve, |
---|
| 722 | // but there shouldn't be any remaining past this point. |
---|
[f9cebb5] | 723 | static UniqueName staticNamer( "_static_var" ); |
---|
[c8dfcd3] | 724 | objDecl->set_name( objDecl->get_name() + staticNamer.newName() ); |
---|
| 725 | objDecl->set_mangleName( SymTab::Mangler::mangle( objDecl ) ); |
---|
[f9cebb5] | 726 | |
---|
| 727 | // xxx - temporary hack: need to return a declaration, but want to hoist the current object out of this scope |
---|
| 728 | // create a new object which is never used |
---|
| 729 | static UniqueName dummyNamer( "_dummy" ); |
---|
[68fe077a] | 730 | 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] | 731 | delete ctorInit; |
---|
[f9cebb5] | 732 | return dummy; |
---|
| 733 | } |
---|
[c2931ea] | 734 | } else { |
---|
[e3e16bc] | 735 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * > ( ctor ); |
---|
[5363fdf] | 736 | ExprStmt * ctorStmt = dynamic_cast< ExprStmt * >( implicit->callStmt ); |
---|
[233e4d9] | 737 | ApplicationExpr * ctorCall = nullptr; |
---|
[5363fdf] | 738 | if ( ctorStmt && (ctorCall = isIntrinsicCallExpr( ctorStmt->expr )) && ctorCall->get_args().size() == 2 ) { |
---|
[233e4d9] | 739 | // clean up intrinsic copy constructor calls by making them into SingleInits |
---|
[5363fdf] | 740 | objDecl->init = new SingleInit( ctorCall->args.back() ); |
---|
| 741 | ctorCall->args.pop_back(); |
---|
[233e4d9] | 742 | } else { |
---|
| 743 | stmtsToAddAfter.push_back( ctor ); |
---|
[5363fdf] | 744 | objDecl->init = nullptr; |
---|
| 745 | ctorInit->ctor = nullptr; |
---|
[233e4d9] | 746 | } |
---|
[adcc065] | 747 | } // if |
---|
[5363fdf] | 748 | } else if ( Initializer * init = ctorInit->init ) { |
---|
| 749 | objDecl->init = init; |
---|
| 750 | ctorInit->init = nullptr; |
---|
[c2931ea] | 751 | } else { |
---|
| 752 | // no constructor and no initializer, which is okay |
---|
[5363fdf] | 753 | objDecl->init = nullptr; |
---|
[adcc065] | 754 | } // if |
---|
[c2931ea] | 755 | delete ctorInit; |
---|
[adcc065] | 756 | } // if |
---|
[c2931ea] | 757 | return objDecl; |
---|
[db4ecc5] | 758 | } |
---|
| 759 | |
---|
[698ec72] | 760 | void ObjDeclCollector::previsit( CompoundStmt * ) { |
---|
| 761 | GuardValue( curVars ); |
---|
[db4ecc5] | 762 | } |
---|
| 763 | |
---|
[698ec72] | 764 | void ObjDeclCollector::previsit( DeclStmt * stmt ) { |
---|
[4b2589a] | 765 | // keep track of all variables currently in scope |
---|
[c2931ea] | 766 | if ( ObjectDecl * objDecl = dynamic_cast< ObjectDecl * > ( stmt->get_decl() ) ) { |
---|
[62423350] | 767 | curVars.push_back( objDecl ); |
---|
[adcc065] | 768 | } // if |
---|
[db4ecc5] | 769 | } |
---|
| 770 | |
---|
[698ec72] | 771 | void LabelFinder::previsit( Statement * stmt ) { |
---|
[4b2589a] | 772 | // for each label, remember the variables in scope at that label. |
---|
[c2931ea] | 773 | for ( Label l : stmt->get_labels() ) { |
---|
| 774 | vars[l] = curVars; |
---|
[adcc065] | 775 | } // for |
---|
[71f4e4f] | 776 | } |
---|
[f1e012b] | 777 | |
---|
[698ec72] | 778 | void LabelFinder::previsit( CompoundStmt * stmt ) { |
---|
| 779 | previsit( (Statement *)stmt ); |
---|
| 780 | Parent::previsit( stmt ); |
---|
| 781 | } |
---|
| 782 | |
---|
| 783 | void LabelFinder::previsit( DeclStmt * stmt ) { |
---|
| 784 | previsit( (Statement *)stmt ); |
---|
| 785 | Parent::previsit( stmt ); |
---|
| 786 | } |
---|
| 787 | |
---|
| 788 | |
---|
[ec79847] | 789 | template<typename Iterator, typename OutputIterator> |
---|
| 790 | void insertDtors( Iterator begin, Iterator end, OutputIterator out ) { |
---|
| 791 | for ( Iterator it = begin ; it != end ; ++it ) { |
---|
[adcc065] | 792 | // extract destructor statement from the object decl and insert it into the output. Note that this is |
---|
| 793 | // only called on lists of non-static objects with implicit non-intrinsic dtors, so if the user manually |
---|
| 794 | // calls an intrinsic dtor then the call must (and will) still be generated since the argument may |
---|
| 795 | // contain side effects. |
---|
[c2931ea] | 796 | ObjectDecl * objDecl = *it; |
---|
| 797 | ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ); |
---|
| 798 | assert( ctorInit && ctorInit->get_dtor() ); |
---|
| 799 | *out++ = ctorInit->get_dtor()->clone(); |
---|
[adcc065] | 800 | } // for |
---|
[f1e012b] | 801 | } |
---|
[39786813] | 802 | |
---|
[698ec72] | 803 | void InsertDtors::previsit( ObjectDecl * objDecl ) { |
---|
[c2931ea] | 804 | // remember non-static destructed objects so that their destructors can be inserted later |
---|
[08d5507b] | 805 | if ( ! objDecl->get_storageClasses().is_static ) { |
---|
[c2931ea] | 806 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 807 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 808 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 809 | Statement * dtor = ctorInit->get_dtor(); |
---|
[e4d6335] | 810 | // don't need to call intrinsic dtor, because it does nothing, but |
---|
| 811 | // non-intrinsic dtors must be called |
---|
[f9cebb5] | 812 | if ( dtor && ! isIntrinsicSingleArgCallStmt( dtor ) ) { |
---|
[e4d6335] | 813 | // set dtor location to the object's location for error messages |
---|
| 814 | ctorInit->dtor->location = objDecl->location; |
---|
[c2931ea] | 815 | reverseDeclOrder.front().push_front( objDecl ); |
---|
[adcc065] | 816 | } // if |
---|
| 817 | } // if |
---|
| 818 | } // if |
---|
[52c14b3] | 819 | } |
---|
| 820 | |
---|
[698ec72] | 821 | void InsertDtors::previsit( FunctionDecl * funcDecl ) { |
---|
[52c14b3] | 822 | // each function needs to have its own set of labels |
---|
[698ec72] | 823 | GuardValue( labelVars ); |
---|
[52c14b3] | 824 | labelVars.clear(); |
---|
[680620d] | 825 | // LabelFinder does not recurse into FunctionDecl, so need to visit |
---|
| 826 | // its children manually. |
---|
[698ec72] | 827 | maybeAccept( funcDecl->type, finder ); |
---|
| 828 | maybeAccept( funcDecl->statements, finder ); |
---|
[52c14b3] | 829 | |
---|
[698ec72] | 830 | // all labels for this function have been collected, insert destructors as appropriate via implicit recursion. |
---|
[52c14b3] | 831 | } |
---|
| 832 | |
---|
[698ec72] | 833 | void InsertDtors::previsit( CompoundStmt * compoundStmt ) { |
---|
[adcc065] | 834 | // visit statements - this will also populate reverseDeclOrder list. don't want to dump all destructors |
---|
| 835 | // when block is left, just the destructors associated with variables defined in this block, so push a new |
---|
| 836 | // list to the top of the stack so that we can differentiate scopes |
---|
[c2931ea] | 837 | reverseDeclOrder.push_front( OrderedDecls() ); |
---|
[698ec72] | 838 | Parent::previsit( compoundStmt ); |
---|
| 839 | } |
---|
[39786813] | 840 | |
---|
[698ec72] | 841 | void InsertDtors::postvisit( CompoundStmt * compoundStmt ) { |
---|
[0661678] | 842 | // add destructors for the current scope that we're exiting, unless the last statement is a return, which |
---|
| 843 | // causes unreachable code warnings |
---|
[c2931ea] | 844 | std::list< Statement * > & statements = compoundStmt->get_kids(); |
---|
[0661678] | 845 | if ( ! statements.empty() && ! dynamic_cast< ReturnStmt * >( statements.back() ) ) { |
---|
| 846 | insertDtors( reverseDeclOrder.front().begin(), reverseDeclOrder.front().end(), back_inserter( statements ) ); |
---|
| 847 | } |
---|
[c2931ea] | 848 | reverseDeclOrder.pop_front(); |
---|
[39786813] | 849 | } |
---|
| 850 | |
---|
[698ec72] | 851 | void InsertDtors::previsit( ReturnStmt * ) { |
---|
[4b2589a] | 852 | // return exits all scopes, so dump destructors for all scopes |
---|
[c2931ea] | 853 | for ( OrderedDecls & od : reverseDeclOrder ) { |
---|
[698ec72] | 854 | insertDtors( od.begin(), od.end(), back_inserter( stmtsToAddBefore ) ); |
---|
[adcc065] | 855 | } // for |
---|
[39786813] | 856 | } |
---|
[f1e012b] | 857 | |
---|
[adcc065] | 858 | // Handle break/continue/goto in the same manner as C++. Basic idea: any objects that are in scope at the |
---|
| 859 | // BranchStmt but not at the labelled (target) statement must be destructed. If there are any objects in scope |
---|
| 860 | // at the target location but not at the BranchStmt then those objects would be uninitialized so notify the user |
---|
| 861 | // of the error. See C++ Reference 6.6 Jump Statements for details. |
---|
[c2931ea] | 862 | void InsertDtors::handleGoto( BranchStmt * stmt ) { |
---|
[5809461] | 863 | // can't do anything for computed goto |
---|
| 864 | if ( stmt->computedTarget ) return; |
---|
| 865 | |
---|
| 866 | assertf( stmt->get_target() != "", "BranchStmt missing a label: %s", toString( stmt ).c_str() ); |
---|
[c2931ea] | 867 | // S_L = lvars = set of objects in scope at label definition |
---|
| 868 | // S_G = curVars = set of objects in scope at goto statement |
---|
| 869 | ObjectSet & lvars = labelVars[ stmt->get_target() ]; |
---|
| 870 | |
---|
| 871 | DTOR_PRINT( |
---|
| 872 | std::cerr << "at goto label: " << stmt->get_target().get_name() << std::endl; |
---|
| 873 | std::cerr << "S_G = " << printSet( curVars ) << std::endl; |
---|
| 874 | std::cerr << "S_L = " << printSet( lvars ) << std::endl; |
---|
| 875 | ) |
---|
| 876 | |
---|
| 877 | ObjectSet diff; |
---|
| 878 | // S_L-S_G results in set of objects whose construction is skipped - it's an error if this set is non-empty |
---|
| 879 | std::set_difference( lvars.begin(), lvars.end(), curVars.begin(), curVars.end(), std::inserter( diff, diff.begin() ) ); |
---|
| 880 | DTOR_PRINT( |
---|
| 881 | std::cerr << "S_L-S_G = " << printSet( diff ) << std::endl; |
---|
| 882 | ) |
---|
| 883 | if ( ! diff.empty() ) { |
---|
| 884 | throw SemanticError( std::string("jump to label '") + stmt->get_target().get_name() + "' crosses initialization of " + (*diff.begin())->get_name() + " ", stmt ); |
---|
[adcc065] | 885 | } // if |
---|
[c2931ea] | 886 | // S_G-S_L results in set of objects that must be destructed |
---|
| 887 | diff.clear(); |
---|
| 888 | std::set_difference( curVars.begin(), curVars.end(), lvars.begin(), lvars.end(), std::inserter( diff, diff.end() ) ); |
---|
| 889 | DTOR_PRINT( |
---|
| 890 | std::cerr << "S_G-S_L = " << printSet( diff ) << std::endl; |
---|
| 891 | ) |
---|
| 892 | if ( ! diff.empty() ) { |
---|
[62423350] | 893 | // create an auxilliary set for fast lookup -- can't make diff a set, because diff ordering should be consistent for error messages. |
---|
| 894 | std::unordered_set<ObjectDecl *> needsDestructor( diff.begin(), diff.end() ); |
---|
| 895 | |
---|
[c2931ea] | 896 | // go through decl ordered list of objectdecl. for each element that occurs in diff, output destructor |
---|
| 897 | OrderedDecls ordered; |
---|
| 898 | for ( OrderedDecls & rdo : reverseDeclOrder ) { |
---|
| 899 | // add elements from reverseDeclOrder into ordered if they occur in diff - it is key that this happens in reverse declaration order. |
---|
[62423350] | 900 | copy_if( rdo.begin(), rdo.end(), back_inserter( ordered ), [&]( ObjectDecl * objDecl ) { return needsDestructor.count( objDecl ); } ); |
---|
[adcc065] | 901 | } // for |
---|
[698ec72] | 902 | insertDtors( ordered.begin(), ordered.end(), back_inserter( stmtsToAddBefore ) ); |
---|
[adcc065] | 903 | } // if |
---|
[c2931ea] | 904 | } |
---|
[39786813] | 905 | |
---|
[698ec72] | 906 | void InsertDtors::previsit( BranchStmt * stmt ) { |
---|
[c2931ea] | 907 | switch( stmt->get_type() ) { |
---|
[adcc065] | 908 | case BranchStmt::Continue: |
---|
| 909 | case BranchStmt::Break: |
---|
| 910 | // could optimize the break/continue case, because the S_L-S_G check is unnecessary (this set should |
---|
| 911 | // always be empty), but it serves as a small sanity check. |
---|
| 912 | case BranchStmt::Goto: |
---|
| 913 | handleGoto( stmt ); |
---|
| 914 | break; |
---|
| 915 | default: |
---|
| 916 | assert( false ); |
---|
| 917 | } // switch |
---|
[c2931ea] | 918 | } |
---|
[79970ed] | 919 | |
---|
| 920 | bool checkWarnings( FunctionDecl * funcDecl ) { |
---|
| 921 | // only check for warnings if the current function is a user-defined |
---|
| 922 | // constructor or destructor |
---|
| 923 | if ( ! funcDecl ) return false; |
---|
| 924 | if ( ! funcDecl->get_statements() ) return false; |
---|
[bff227f] | 925 | return CodeGen::isCtorDtor( funcDecl->get_name() ) && ! LinkageSpec::isOverridable( funcDecl->get_linkage() ); |
---|
[79970ed] | 926 | } |
---|
| 927 | |
---|
[5363fdf] | 928 | void addIds( SymTab::Indexer & indexer, const std::list< DeclarationWithType * > & decls ) { |
---|
| 929 | for ( auto d : decls ) { |
---|
| 930 | indexer.addId( d ); |
---|
| 931 | } |
---|
| 932 | } |
---|
| 933 | |
---|
| 934 | void addTypes( SymTab::Indexer & indexer, const std::list< TypeDecl * > & tds ) { |
---|
| 935 | for ( auto td : tds ) { |
---|
| 936 | indexer.addType( td ); |
---|
| 937 | addIds( indexer, td->assertions ); |
---|
| 938 | } |
---|
| 939 | } |
---|
| 940 | |
---|
[9a707e4e] | 941 | void GenStructMemberCalls::previsit( FunctionDecl * funcDecl ) { |
---|
[5363fdf] | 942 | GuardValue( function ); |
---|
[9a707e4e] | 943 | GuardValue( unhandled ); |
---|
| 944 | GuardValue( usedUninit ); |
---|
| 945 | GuardValue( thisParam ); |
---|
| 946 | GuardValue( isCtor ); |
---|
| 947 | GuardValue( structDecl ); |
---|
[64ac636] | 948 | errors = SemanticError(); // clear previous errors |
---|
[c8dfcd3] | 949 | |
---|
| 950 | // need to start with fresh sets |
---|
| 951 | unhandled.clear(); |
---|
| 952 | usedUninit.clear(); |
---|
[79970ed] | 953 | |
---|
| 954 | function = funcDecl; |
---|
[bff227f] | 955 | isCtor = CodeGen::isConstructor( function->get_name() ); |
---|
[c8dfcd3] | 956 | if ( checkWarnings( function ) ) { |
---|
| 957 | FunctionType * type = function->get_functionType(); |
---|
[79970ed] | 958 | assert( ! type->get_parameters().empty() ); |
---|
[e3e16bc] | 959 | thisParam = strict_dynamic_cast< ObjectDecl * >( type->get_parameters().front() ); |
---|
[0a81c3f] | 960 | Type * thisType = getPointerBase( thisParam->get_type() ); |
---|
| 961 | StructInstType * structType = dynamic_cast< StructInstType * >( thisType ); |
---|
[79970ed] | 962 | if ( structType ) { |
---|
[44f6341] | 963 | structDecl = structType->get_baseStruct(); |
---|
[79970ed] | 964 | for ( Declaration * member : structDecl->get_members() ) { |
---|
| 965 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
---|
| 966 | // record all of the struct type's members that need to be constructed or |
---|
| 967 | // destructed by the end of the function |
---|
| 968 | unhandled.insert( field ); |
---|
| 969 | } |
---|
| 970 | } |
---|
| 971 | } |
---|
| 972 | } |
---|
[9a707e4e] | 973 | } |
---|
| 974 | |
---|
| 975 | void GenStructMemberCalls::postvisit( FunctionDecl * funcDecl ) { |
---|
[c8dfcd3] | 976 | // remove the unhandled objects from usedUninit, because a call is inserted |
---|
| 977 | // to handle them - only objects that are later constructed are used uninitialized. |
---|
[64ac636] | 978 | std::map< DeclarationWithType *, CodeLocation > diff; |
---|
| 979 | // need the comparator since usedUninit and unhandled have different types |
---|
| 980 | struct comp_t { |
---|
| 981 | typedef decltype(usedUninit)::value_type usedUninit_t; |
---|
| 982 | typedef decltype(unhandled)::value_type unhandled_t; |
---|
| 983 | bool operator()(usedUninit_t x, unhandled_t y) { return x.first < y; } |
---|
| 984 | bool operator()(unhandled_t x, usedUninit_t y) { return x < y.first; } |
---|
| 985 | } comp; |
---|
| 986 | std::set_difference( usedUninit.begin(), usedUninit.end(), unhandled.begin(), unhandled.end(), std::inserter( diff, diff.begin() ), comp ); |
---|
| 987 | for ( auto p : diff ) { |
---|
| 988 | DeclarationWithType * member = p.first; |
---|
| 989 | CodeLocation loc = p.second; |
---|
| 990 | // xxx - make error message better by also tracking the location that the object is constructed at? |
---|
| 991 | emit( loc, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", member->get_name(), " used before being constructed" ); |
---|
[79970ed] | 992 | } |
---|
| 993 | |
---|
[c8dfcd3] | 994 | if ( ! unhandled.empty() ) { |
---|
[4618319] | 995 | // need to explicitly re-add function parameters to the indexer in order to resolve copy constructors |
---|
[9a707e4e] | 996 | auto guard = makeFuncGuard( [this]() { indexer.enterScope(); }, [this]() { indexer.leaveScope(); } ); |
---|
| 997 | addTypes( indexer, function->type->forall ); |
---|
| 998 | addIds( indexer, function->type->returnVals ); |
---|
| 999 | addIds( indexer, function->type->parameters ); |
---|
[44f6341] | 1000 | |
---|
| 1001 | // need to iterate through members in reverse in order for |
---|
| 1002 | // ctor/dtor statements to come out in the right order |
---|
[1ba88a0] | 1003 | for ( Declaration * member : reverseIterate( structDecl->get_members() ) ) { |
---|
[44f6341] | 1004 | DeclarationWithType * field = dynamic_cast< DeclarationWithType * >( member ); |
---|
| 1005 | // skip non-DWT members |
---|
| 1006 | if ( ! field ) continue; |
---|
[05807e9] | 1007 | // skip non-constructable members |
---|
| 1008 | if ( ! tryConstruct( field ) ) continue; |
---|
[44f6341] | 1009 | // skip handled members |
---|
| 1010 | if ( ! unhandled.count( field ) ) continue; |
---|
| 1011 | |
---|
| 1012 | // insert and resolve default/copy constructor call for each field that's unhandled |
---|
[c8dfcd3] | 1013 | std::list< Statement * > stmt; |
---|
[4d4882a] | 1014 | Expression * arg2 = 0; |
---|
| 1015 | if ( isCopyConstructor( function ) ) { |
---|
[44f6341] | 1016 | // if copy ctor, need to pass second-param-of-this-function.field |
---|
[4d4882a] | 1017 | std::list< DeclarationWithType * > & params = function->get_functionType()->get_parameters(); |
---|
| 1018 | assert( params.size() == 2 ); |
---|
[44f6341] | 1019 | arg2 = new MemberExpr( field, new VariableExpr( params.back() ) ); |
---|
[4d4882a] | 1020 | } |
---|
| 1021 | InitExpander srcParam( arg2 ); |
---|
[4618319] | 1022 | // cast away reference type and construct field. |
---|
| 1023 | Expression * thisExpr = new CastExpr( new VariableExpr( thisParam ), thisParam->get_type()->stripReferences()->clone() ); |
---|
| 1024 | Expression * memberDest = new MemberExpr( field, thisExpr ); |
---|
| 1025 | SymTab::genImplicitCall( srcParam, memberDest, function->get_name(), back_inserter( stmt ), field, isCtor ); |
---|
[c8dfcd3] | 1026 | |
---|
| 1027 | assert( stmt.size() <= 1 ); |
---|
| 1028 | if ( stmt.size() == 1 ) { |
---|
| 1029 | Statement * callStmt = stmt.front(); |
---|
| 1030 | |
---|
[9a707e4e] | 1031 | MutatingResolver resolver( indexer ); |
---|
[c8dfcd3] | 1032 | try { |
---|
| 1033 | callStmt->acceptMutator( resolver ); |
---|
| 1034 | if ( isCtor ) { |
---|
| 1035 | function->get_statements()->push_front( callStmt ); |
---|
| 1036 | } else { |
---|
| 1037 | // destructor statements should be added at the end |
---|
| 1038 | function->get_statements()->push_back( callStmt ); |
---|
| 1039 | } |
---|
| 1040 | } catch ( SemanticError & error ) { |
---|
[64ac636] | 1041 | 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] | 1042 | } |
---|
| 1043 | } |
---|
| 1044 | } |
---|
| 1045 | } |
---|
[64ac636] | 1046 | if (! errors.isEmpty()) { |
---|
| 1047 | throw errors; |
---|
| 1048 | } |
---|
[79970ed] | 1049 | } |
---|
| 1050 | |
---|
[4618319] | 1051 | /// true if expr is effectively just the 'this' parameter |
---|
| 1052 | bool isThisExpression( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1053 | // TODO: there are more complicated ways to pass 'this' to a constructor, e.g. &*, *&, etc. |
---|
| 1054 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
---|
| 1055 | return varExpr->get_var() == thisParam; |
---|
| 1056 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( expr ) ) { |
---|
| 1057 | return isThisExpression( castExpr->get_arg(), thisParam ); |
---|
| 1058 | } |
---|
| 1059 | return false; |
---|
| 1060 | } |
---|
| 1061 | |
---|
| 1062 | /// returns a MemberExpr if expr is effectively just member access on the 'this' parameter, else nullptr |
---|
| 1063 | MemberExpr * isThisMemberExpr( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1064 | if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
---|
| 1065 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1066 | return memberExpr; |
---|
| 1067 | } |
---|
| 1068 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
---|
| 1069 | return isThisMemberExpr( castExpr->get_arg(), thisParam ); |
---|
| 1070 | } |
---|
| 1071 | return nullptr; |
---|
| 1072 | } |
---|
| 1073 | |
---|
[9a707e4e] | 1074 | void GenStructMemberCalls::previsit( ApplicationExpr * appExpr ) { |
---|
| 1075 | if ( ! checkWarnings( function ) ) { |
---|
| 1076 | visit_children = false; |
---|
| 1077 | return; |
---|
| 1078 | } |
---|
[79970ed] | 1079 | |
---|
| 1080 | std::string fname = getFunctionName( appExpr ); |
---|
| 1081 | if ( fname == function->get_name() ) { |
---|
| 1082 | // call to same kind of function |
---|
| 1083 | Expression * firstParam = appExpr->get_args().front(); |
---|
| 1084 | |
---|
[4618319] | 1085 | if ( isThisExpression( firstParam, thisParam ) ) { |
---|
[79970ed] | 1086 | // if calling another constructor on thisParam, assume that function handles |
---|
| 1087 | // all members - if it doesn't a warning will appear in that function. |
---|
[4618319] | 1088 | unhandled.clear(); |
---|
| 1089 | } else if ( MemberExpr * memberExpr = isThisMemberExpr( firstParam, thisParam ) ) { |
---|
| 1090 | // if first parameter is a member expression on the this parameter, |
---|
| 1091 | // then remove the member from unhandled set. |
---|
| 1092 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1093 | unhandled.erase( memberExpr->get_member() ); |
---|
[79970ed] | 1094 | } |
---|
| 1095 | } |
---|
| 1096 | } |
---|
| 1097 | } |
---|
| 1098 | |
---|
[9a707e4e] | 1099 | void GenStructMemberCalls::previsit( MemberExpr * memberExpr ) { |
---|
| 1100 | if ( ! checkWarnings( function ) || ! isCtor ) { |
---|
| 1101 | visit_children = false; |
---|
| 1102 | return; |
---|
| 1103 | } |
---|
[79970ed] | 1104 | |
---|
[4618319] | 1105 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1106 | if ( unhandled.count( memberExpr->get_member() ) ) { |
---|
| 1107 | // emit a warning because a member was used before it was constructed |
---|
| 1108 | usedUninit.insert( { memberExpr->get_member(), memberExpr->location } ); |
---|
[79970ed] | 1109 | } |
---|
| 1110 | } |
---|
| 1111 | } |
---|
[3906301] | 1112 | |
---|
| 1113 | template< typename Visitor, typename... Params > |
---|
[64ac636] | 1114 | void error( Visitor & v, CodeLocation loc, const Params &... params ) { |
---|
| 1115 | SemanticError err( toString( params... ) ); |
---|
| 1116 | err.set_location( loc ); |
---|
| 1117 | v.errors.append( err ); |
---|
[3906301] | 1118 | } |
---|
| 1119 | |
---|
| 1120 | template< typename... Params > |
---|
[64ac636] | 1121 | void GenStructMemberCalls::emit( CodeLocation loc, const Params &... params ) { |
---|
[3906301] | 1122 | // toggle warnings vs. errors here. |
---|
| 1123 | // warn( params... ); |
---|
[64ac636] | 1124 | error( *this, loc, params... ); |
---|
[3906301] | 1125 | } |
---|
[c8dfcd3] | 1126 | |
---|
[08da53d] | 1127 | DeclarationWithType * MutatingResolver::mutate( ObjectDecl * objectDecl ) { |
---|
[c8dfcd3] | 1128 | // add object to the indexer assumes that there will be no name collisions |
---|
| 1129 | // in generated code. If this changes, add mutate methods for entities with |
---|
| 1130 | // scope and call {enter,leave}Scope explicitly. |
---|
[33a25f9] | 1131 | indexer.addId( objectDecl ); |
---|
[c8dfcd3] | 1132 | return objectDecl; |
---|
| 1133 | } |
---|
| 1134 | |
---|
[08da53d] | 1135 | Expression * MutatingResolver::mutate( UntypedExpr * untypedExpr ) { |
---|
| 1136 | Expression * newExpr = untypedExpr; |
---|
| 1137 | ResolvExpr::findVoidExpression( newExpr, indexer ); |
---|
| 1138 | return newExpr; |
---|
[c8dfcd3] | 1139 | } |
---|
[b6fe7e6] | 1140 | |
---|
[696bf6e] | 1141 | Expression * FixCtorExprs::postmutate( ConstructorExpr * ctorExpr ) { |
---|
[b6fe7e6] | 1142 | static UniqueName tempNamer( "_tmp_ctor_expr" ); |
---|
[f0121d7] | 1143 | // xxx - is the size check necessary? |
---|
[d29fa5f] | 1144 | assert( ctorExpr->result && ctorExpr->get_result()->size() == 1 ); |
---|
[b7b8674] | 1145 | |
---|
| 1146 | // 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. |
---|
[3aeaecd] | 1147 | ObjectDecl * tmp = ObjectDecl::newObject( tempNamer.newName(), ctorExpr->get_result()->clone(), nullptr ); |
---|
[696bf6e] | 1148 | declsToAddBefore.push_back( tmp ); |
---|
[b6fe7e6] | 1149 | |
---|
[627f585] | 1150 | // xxx - this can be TupleAssignExpr now. Need to properly handle this case. |
---|
[e3e16bc] | 1151 | ApplicationExpr * callExpr = strict_dynamic_cast< ApplicationExpr * > ( ctorExpr->get_callExpr() ); |
---|
[b6fe7e6] | 1152 | TypeSubstitution * env = ctorExpr->get_env(); |
---|
| 1153 | ctorExpr->set_callExpr( nullptr ); |
---|
| 1154 | ctorExpr->set_env( nullptr ); |
---|
[8a6cf7e] | 1155 | delete ctorExpr; |
---|
[b6fe7e6] | 1156 | |
---|
[696bf6e] | 1157 | // build assignment and replace constructor's first argument with new temporary |
---|
[b6fe7e6] | 1158 | Expression *& firstArg = callExpr->get_args().front(); |
---|
[696bf6e] | 1159 | Expression * assign = new UntypedExpr( new NameExpr( "?=?" ), { new AddressExpr( new VariableExpr( tmp ) ), new AddressExpr( firstArg ) } ); |
---|
[8a6cf7e] | 1160 | firstArg = new VariableExpr( tmp ); |
---|
| 1161 | |
---|
[696bf6e] | 1162 | // resolve assignment and dispose of new env |
---|
[08da53d] | 1163 | ResolvExpr::findVoidExpression( assign, indexer ); |
---|
| 1164 | delete assign->env; |
---|
| 1165 | assign->env = nullptr; |
---|
[696bf6e] | 1166 | |
---|
[8a6cf7e] | 1167 | // for constructor expr: |
---|
| 1168 | // T x; |
---|
| 1169 | // x{}; |
---|
| 1170 | // results in: |
---|
| 1171 | // T x; |
---|
| 1172 | // T & tmp; |
---|
| 1173 | // &tmp = &x, ?{}(tmp), tmp |
---|
[08da53d] | 1174 | CommaExpr * commaExpr = new CommaExpr( assign, new CommaExpr( callExpr, new VariableExpr( tmp ) ) ); |
---|
[b6fe7e6] | 1175 | commaExpr->set_env( env ); |
---|
| 1176 | return commaExpr; |
---|
| 1177 | } |
---|
[c2931ea] | 1178 | } // namespace |
---|
[71f4e4f] | 1179 | } // namespace InitTweak |
---|
| 1180 | |
---|
| 1181 | // Local Variables: // |
---|
| 1182 | // tab-width: 4 // |
---|
| 1183 | // mode: c++ // |
---|
| 1184 | // compile-command: "make install" // |
---|
| 1185 | // End: // |
---|