[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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| 95 | void copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr ); |
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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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[b6fe7e6] | 262 | // xxx - ctor expansion currently has to be after FixCopyCtors, because there is currently a |
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| 263 | // hack in the way untyped assignments are generated, where the first argument cannot have |
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| 264 | // its address taken because of the way codegeneration handles UntypedExpr vs. ApplicationExpr. |
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| 265 | // Thus such assignment exprs must never pushed through expression resolution (and thus should |
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| 266 | // not go through the FixCopyCtors pass), otherwise they will fail -- guaranteed. |
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| 267 | // Also needs to happen after GenStructMemberCalls, since otherwise member constructors exprs |
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| 268 | // don't look right, and a member can be constructed more than once. |
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| 269 | FixCtorExprs::fix( translationUnit ); |
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[db4ecc5] | 270 | } |
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| 271 | |
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[c2931ea] | 272 | namespace { |
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[c0714bf] | 273 | void InsertImplicitCalls::insert( std::list< Declaration * > & translationUnit ) { |
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| 274 | PassVisitor<InsertImplicitCalls> inserter; |
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[c2931ea] | 275 | mutateAll( translationUnit, inserter ); |
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| 276 | } |
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[db4ecc5] | 277 | |
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[c0714bf] | 278 | void ResolveCopyCtors::resolveImplicitCalls( std::list< Declaration * > & translationUnit, UnqCount & unqCount ) { |
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| 279 | PassVisitor<ResolveCopyCtors> resolver( unqCount ); |
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[c2931ea] | 280 | acceptAll( translationUnit, resolver ); |
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| 281 | } |
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[71f4e4f] | 282 | |
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[c2931ea] | 283 | void FixInit::fixInitializers( std::list< Declaration * > & translationUnit ) { |
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[aff3af4] | 284 | PassVisitor<FixInit> fixer; |
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[72e9222] | 285 | |
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| 286 | // can't use mutateAll, because need to insert declarations at top-level |
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| 287 | // can't use DeclMutator, because sometimes need to insert IfStmt, etc. |
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| 288 | SemanticError errors; |
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| 289 | for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) { |
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| 290 | try { |
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[3c398b6] | 291 | maybeMutate( *i, fixer ); |
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[aff3af4] | 292 | translationUnit.splice( i, fixer.pass.staticDtorDecls ); |
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[72e9222] | 293 | } catch( SemanticError &e ) { |
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[138e29e] | 294 | e.set_location( (*i)->location ); |
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[72e9222] | 295 | errors.append( e ); |
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| 296 | } // try |
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| 297 | } // for |
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| 298 | if ( ! errors.isEmpty() ) { |
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| 299 | throw errors; |
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| 300 | } // if |
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[c2931ea] | 301 | } |
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[71f4e4f] | 302 | |
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[c2931ea] | 303 | void InsertDtors::insert( std::list< Declaration * > & translationUnit ) { |
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[698ec72] | 304 | PassVisitor<LabelFinder> finder; |
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| 305 | PassVisitor<InsertDtors> inserter( finder ); |
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[c2931ea] | 306 | acceptAll( translationUnit, inserter ); |
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| 307 | } |
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| 308 | |
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[597db97] | 309 | void FixCopyCtors::fixCopyCtors( std::list< Declaration * > & translationUnit, UnqCount & unqCount ) { |
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[dc2334c] | 310 | PassVisitor<FixCopyCtors> fixer( unqCount ); |
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[c2931ea] | 311 | mutateAll( translationUnit, fixer ); |
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| 312 | } |
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[db4ecc5] | 313 | |
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[c8dfcd3] | 314 | void GenStructMemberCalls::generate( std::list< Declaration * > & translationUnit ) { |
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[9a707e4e] | 315 | PassVisitor<GenStructMemberCalls> warner; |
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[c8dfcd3] | 316 | acceptAll( translationUnit, warner ); |
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[79970ed] | 317 | } |
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| 318 | |
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[b6fe7e6] | 319 | void FixCtorExprs::fix( std::list< Declaration * > & translationUnit ) { |
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[696bf6e] | 320 | PassVisitor<FixCtorExprs> fixer; |
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| 321 | mutateAll( translationUnit, fixer ); |
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[b6fe7e6] | 322 | } |
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| 323 | |
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[134322e] | 324 | Expression * InsertImplicitCalls::postmutate( ApplicationExpr * appExpr ) { |
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[c2931ea] | 325 | assert( appExpr ); |
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| 326 | |
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| 327 | if ( VariableExpr * function = dynamic_cast< VariableExpr * > ( appExpr->get_function() ) ) { |
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[9a063c8] | 328 | if ( LinkageSpec::isBuiltin( function->get_var()->get_linkage() ) ) { |
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[c2931ea] | 329 | // optimization: don't need to copy construct in order to call intrinsic functions |
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| 330 | return appExpr; |
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| 331 | } else if ( DeclarationWithType * funcDecl = dynamic_cast< DeclarationWithType * > ( function->get_var() ) ) { |
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| 332 | FunctionType * ftype = dynamic_cast< FunctionType * >( GenPoly::getFunctionType( funcDecl->get_type() ) ); |
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[05807e9] | 333 | assertf( ftype, "Function call without function type: %s", toString( funcDecl ).c_str() ); |
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[bff227f] | 334 | if ( CodeGen::isConstructor( funcDecl->get_name() ) && ftype->get_parameters().size() == 2 ) { |
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[0a81c3f] | 335 | Type * t1 = getPointerBase( ftype->get_parameters().front()->get_type() ); |
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[c2931ea] | 336 | Type * t2 = ftype->get_parameters().back()->get_type(); |
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[0a81c3f] | 337 | assert( t1 ); |
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[c2931ea] | 338 | |
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[0a81c3f] | 339 | if ( ResolvExpr::typesCompatible( t1, t2, SymTab::Indexer() ) ) { |
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[a28bc02] | 340 | // optimization: don't need to copy construct in order to call a copy constructor |
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[c2931ea] | 341 | return appExpr; |
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[adcc065] | 342 | } // if |
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[bff227f] | 343 | } else if ( CodeGen::isDestructor( funcDecl->get_name() ) ) { |
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[c2931ea] | 344 | // correctness: never copy construct arguments to a destructor |
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[845cedc] | 345 | return appExpr; |
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[adcc065] | 346 | } // if |
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| 347 | } // if |
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| 348 | } // if |
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[c2931ea] | 349 | CP_CTOR_PRINT( std::cerr << "InsertImplicitCalls: adding a wrapper " << appExpr << std::endl; ) |
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| 350 | |
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| 351 | // wrap each function call so that it is easy to identify nodes that have to be copy constructed |
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| 352 | ImplicitCopyCtorExpr * expr = new ImplicitCopyCtorExpr( appExpr ); |
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[c0714bf] | 353 | // Move the type substitution to the new top-level, if it is attached to the appExpr. |
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[c2931ea] | 354 | // Ensure it is not deleted with the ImplicitCopyCtorExpr by removing it before deletion. |
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| 355 | // The substitution is needed to obtain the type of temporary variables so that copy constructor |
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[c0714bf] | 356 | // calls can be resolved. |
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[c2931ea] | 357 | assert( env ); |
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[c0714bf] | 358 | std::swap( expr->env, appExpr->env ); |
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[c2931ea] | 359 | return expr; |
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[db4ecc5] | 360 | } |
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| 361 | |
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[29bc63e] | 362 | bool ResolveCopyCtors::skipCopyConstruct( Type * type ) { return ! isConstructable( type ); } |
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[c2931ea] | 363 | |
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[65660bd] | 364 | Expression * ResolveCopyCtors::makeCtorDtor( const std::string & fname, ObjectDecl * var, Expression * cpArg ) { |
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[c2931ea] | 365 | assert( var ); |
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[092528b] | 366 | // arrays are not copy constructed, so this should always be an ExprStmt |
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| 367 | ImplicitCtorDtorStmt * stmt = genCtorDtor( fname, var, cpArg ); |
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[e3e16bc] | 368 | ExprStmt * exprStmt = strict_dynamic_cast< ExprStmt * >( stmt->get_callStmt() ); |
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[092528b] | 369 | Expression * untyped = exprStmt->get_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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[c2931ea] | 374 | CP_CTOR_PRINT( std::cerr << "ResolvingCtorDtor " << untyped << std::endl; ) |
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[c0714bf] | 375 | Expression * resolved = ResolvExpr::findVoidExpression( untyped, 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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[cf18eea] | 383 | |
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[092528b] | 384 | delete stmt; |
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[c2931ea] | 385 | return resolved; |
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[540de412] | 386 | } |
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[db4ecc5] | 387 | |
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[1132b62] | 388 | void ResolveCopyCtors::copyConstructArg( Expression *& arg, ImplicitCopyCtorExpr * impCpCtorExpr ) { |
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[c2931ea] | 389 | static UniqueName tempNamer("_tmp_cp"); |
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[31f379c] | 390 | assert( env ); |
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| 391 | CP_CTOR_PRINT( std::cerr << "Type Substitution: " << *env << std::endl; ) |
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[d29fa5f] | 392 | assert( arg->result ); |
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[1132b62] | 393 | Type * result = arg->get_result(); |
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| 394 | if ( skipCopyConstruct( result ) ) return; // skip certain non-copyable types |
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| 395 | |
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| 396 | // type may involve type variables, so apply type substitution to get temporary variable's actual type |
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| 397 | result = result->clone(); |
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[31f379c] | 398 | env->apply( 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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| 409 | VariableExpr * function = dynamic_cast< VariableExpr * >( appExpr->get_function() ); |
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| 410 | assert( function ); |
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| 411 | if ( function->get_var()->get_linkage() == LinkageSpec::Intrinsic ) return; |
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| 412 | } |
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| 413 | |
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[3aeaecd] | 414 | // set a unique name for the temporary once it's certain the call is necessary |
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| 415 | tmp->name = tempNamer.newName(); |
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| 416 | |
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[65660bd] | 417 | // replace argument to function call with temporary |
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| 418 | arg = new CommaExpr( cpCtor, new VariableExpr( tmp ) ); |
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| 419 | impCpCtorExpr->get_tempDecls().push_back( tmp ); |
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| 420 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", tmp ) ); |
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[1132b62] | 421 | } |
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[c2931ea] | 422 | |
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[092528b] | 423 | void ResolveCopyCtors::destructRet( ObjectDecl * ret, ImplicitCopyCtorExpr * impCpCtorExpr ) { |
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| 424 | impCpCtorExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
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[1132b62] | 425 | } |
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| 426 | |
---|
[c0714bf] | 427 | void ResolveCopyCtors::postvisit( ImplicitCopyCtorExpr *impCpCtorExpr ) { |
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[c2931ea] | 428 | CP_CTOR_PRINT( std::cerr << "ResolveCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 429 | |
---|
| 430 | ApplicationExpr * appExpr = impCpCtorExpr->get_callExpr(); |
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| 431 | |
---|
| 432 | // take each argument and attempt to copy construct it. |
---|
| 433 | for ( Expression * & arg : appExpr->get_args() ) { |
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[1132b62] | 434 | copyConstructArg( arg, impCpCtorExpr ); |
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[adcc065] | 435 | } // for |
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[db4ecc5] | 436 | |
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[adcc065] | 437 | // each return value from the call needs to be connected with an ObjectDecl at the call site, which is |
---|
| 438 | // initialized with the return value and is destructed later |
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[31f379c] | 439 | // xxx - handle named return values? |
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[906e24d] | 440 | Type * result = appExpr->get_result(); |
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| 441 | if ( ! result->isVoid() ) { |
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[1132b62] | 442 | static UniqueName retNamer("_tmp_cp_ret"); |
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[c2931ea] | 443 | result = result->clone(); |
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[31f379c] | 444 | env->apply( result ); |
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[3aeaecd] | 445 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
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[615a096] | 446 | ret->get_type()->set_const( false ); |
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[c2931ea] | 447 | impCpCtorExpr->get_returnDecls().push_back( ret ); |
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| 448 | CP_CTOR_PRINT( std::cerr << "makeCtorDtor for a return" << std::endl; ) |
---|
[0a81c3f] | 449 | if ( ! dynamic_cast< ReferenceType * >( result ) ) { |
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[3aeaecd] | 450 | // destructing reference returns is bad because it can cause multiple destructor calls to the same object - the returned object is not a temporary |
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[092528b] | 451 | destructRet( ret, impCpCtorExpr ); |
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[dc86541] | 452 | } |
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[adcc065] | 453 | } // for |
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[c2931ea] | 454 | CP_CTOR_PRINT( std::cerr << "after Resolving: " << impCpCtorExpr << std::endl; ) |
---|
[db4ecc5] | 455 | } |
---|
| 456 | |
---|
[c0714bf] | 457 | void ResolveCopyCtors::postvisit( StmtExpr * stmtExpr ) { |
---|
| 458 | assert( env ); |
---|
[31f379c] | 459 | assert( stmtExpr->get_result() ); |
---|
| 460 | Type * result = stmtExpr->get_result(); |
---|
| 461 | if ( ! result->isVoid() ) { |
---|
| 462 | static UniqueName retNamer("_tmp_stmtexpr_ret"); |
---|
| 463 | |
---|
| 464 | // create variable that will hold the result of the stmt expr |
---|
| 465 | result = result->clone(); |
---|
| 466 | env->apply( result ); |
---|
[3aeaecd] | 467 | ObjectDecl * ret = ObjectDecl::newObject( retNamer.newName(), result, nullptr ); |
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[615a096] | 468 | ret->get_type()->set_const( false ); |
---|
[31f379c] | 469 | stmtExpr->get_returnDecls().push_front( ret ); |
---|
| 470 | |
---|
| 471 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
| 472 | CompoundStmt * body = stmtExpr->get_statements(); |
---|
| 473 | assert( ! body->get_kids().empty() ); |
---|
| 474 | // must be an ExprStmt, otherwise it wouldn't have a result |
---|
[e3e16bc] | 475 | ExprStmt * last = strict_dynamic_cast< ExprStmt * >( body->get_kids().back() ); |
---|
[31f379c] | 476 | last->set_expr( makeCtorDtor( "?{}", ret, last->get_expr() ) ); |
---|
| 477 | |
---|
[092528b] | 478 | stmtExpr->get_dtors().push_front( makeCtorDtor( "^?{}", ret ) ); |
---|
[31f379c] | 479 | } // if |
---|
| 480 | } |
---|
| 481 | |
---|
[c0714bf] | 482 | void ResolveCopyCtors::previsit( UniqueExpr * unqExpr ) { |
---|
[597db97] | 483 | unqCount[ unqExpr->get_id() ]++; // count the number of unique expressions for each ID |
---|
[c0714bf] | 484 | if ( vars.count( unqExpr->get_id() ) ) { |
---|
| 485 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 486 | visit_children = false; |
---|
| 487 | } |
---|
| 488 | } |
---|
| 489 | |
---|
| 490 | void ResolveCopyCtors::postvisit( UniqueExpr * unqExpr ) { |
---|
[141b786] | 491 | if ( vars.count( unqExpr->get_id() ) ) { |
---|
| 492 | // xxx - hack to prevent double-handling of unique exprs, otherwise too many temporary variables and destructors are generated |
---|
| 493 | return; |
---|
| 494 | } |
---|
| 495 | |
---|
| 496 | // it should never be necessary to wrap a void-returning expression in a UniqueExpr - if this assumption changes, this needs to be rethought |
---|
| 497 | assert( unqExpr->get_result() ); |
---|
| 498 | if ( ImplicitCopyCtorExpr * impCpCtorExpr = dynamic_cast<ImplicitCopyCtorExpr*>( unqExpr->get_expr() ) ) { |
---|
| 499 | // note the variable used as the result from the call |
---|
| 500 | assert( impCpCtorExpr->get_result() && impCpCtorExpr->get_returnDecls().size() == 1 ); |
---|
| 501 | unqExpr->set_var( new VariableExpr( impCpCtorExpr->get_returnDecls().front() ) ); |
---|
| 502 | } else { |
---|
| 503 | // expr isn't a call expr, so create a new temporary variable to use to hold the value of the unique expression |
---|
[3aeaecd] | 504 | unqExpr->set_object( ObjectDecl::newObject( toString("_unq", unqExpr->get_id()), unqExpr->get_result()->clone(), nullptr ) ); |
---|
[141b786] | 505 | unqExpr->set_var( new VariableExpr( unqExpr->get_object() ) ); |
---|
| 506 | } |
---|
| 507 | vars.insert( unqExpr->get_id() ); |
---|
| 508 | } |
---|
| 509 | |
---|
[dc2334c] | 510 | Expression * FixCopyCtors::postmutate( ImplicitCopyCtorExpr * impCpCtorExpr ) { |
---|
[c2931ea] | 511 | CP_CTOR_PRINT( std::cerr << "FixCopyCtors: " << impCpCtorExpr << std::endl; ) |
---|
| 512 | |
---|
| 513 | std::list< ObjectDecl * > & tempDecls = impCpCtorExpr->get_tempDecls(); |
---|
| 514 | std::list< ObjectDecl * > & returnDecls = impCpCtorExpr->get_returnDecls(); |
---|
| 515 | std::list< Expression * > & dtors = impCpCtorExpr->get_dtors(); |
---|
[845cedc] | 516 | |
---|
[c2931ea] | 517 | // add all temporary declarations and their constructors |
---|
| 518 | for ( ObjectDecl * obj : tempDecls ) { |
---|
[dc2334c] | 519 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[adcc065] | 520 | } // for |
---|
[c2931ea] | 521 | for ( ObjectDecl * obj : returnDecls ) { |
---|
[dc2334c] | 522 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[adcc065] | 523 | } // for |
---|
[db4ecc5] | 524 | |
---|
[c2931ea] | 525 | // add destructors after current statement |
---|
| 526 | for ( Expression * dtor : dtors ) { |
---|
| 527 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
---|
[adcc065] | 528 | } // for |
---|
[db4ecc5] | 529 | |
---|
[c0714bf] | 530 | ObjectDecl * returnDecl = returnDecls.empty() ? nullptr : returnDecls.front(); |
---|
[c2931ea] | 531 | Expression * callExpr = impCpCtorExpr->get_callExpr(); |
---|
| 532 | |
---|
| 533 | CP_CTOR_PRINT( std::cerr << "Coming out the back..." << impCpCtorExpr << std::endl; ) |
---|
| 534 | |
---|
| 535 | // detach fields from wrapper node so that it can be deleted without deleting too much |
---|
| 536 | dtors.clear(); |
---|
| 537 | tempDecls.clear(); |
---|
| 538 | returnDecls.clear(); |
---|
[c0714bf] | 539 | impCpCtorExpr->set_callExpr( nullptr ); |
---|
| 540 | std::swap( impCpCtorExpr->env, callExpr->env ); |
---|
| 541 | assert( impCpCtorExpr->env == nullptr ); |
---|
[c2931ea] | 542 | delete impCpCtorExpr; |
---|
| 543 | |
---|
| 544 | if ( returnDecl ) { |
---|
| 545 | UntypedExpr * assign = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 546 | assign->get_args().push_back( new VariableExpr( returnDecl ) ); |
---|
| 547 | assign->get_args().push_back( callExpr ); |
---|
| 548 | // know the result type of the assignment is the type of the LHS (minus the pointer), so |
---|
| 549 | // add that onto the assignment expression so that later steps have the necessary information |
---|
[906e24d] | 550 | assign->set_result( returnDecl->get_type()->clone() ); |
---|
[c2931ea] | 551 | |
---|
| 552 | Expression * retExpr = new CommaExpr( assign, new VariableExpr( returnDecl ) ); |
---|
[31f379c] | 553 | // move env from callExpr to retExpr |
---|
[50377a4] | 554 | std::swap( retExpr->env, callExpr->env ); |
---|
[c2931ea] | 555 | return retExpr; |
---|
| 556 | } else { |
---|
| 557 | return callExpr; |
---|
[adcc065] | 558 | } // if |
---|
[4ffdd63] | 559 | } |
---|
[c2931ea] | 560 | |
---|
[dc2334c] | 561 | void FixCopyCtors::premutate( StmtExpr * stmtExpr ) { |
---|
[65aca88] | 562 | // function call temporaries should be placed at statement-level, rather than nested inside of a new statement expression, |
---|
| 563 | // since temporaries can be shared across sub-expressions, e.g. |
---|
| 564 | // [A, A] f(); |
---|
| 565 | // g([A] x, [A] y); |
---|
[dc2334c] | 566 | // g(f()); |
---|
[65aca88] | 567 | // f is executed once, so the return temporary is shared across the tuple constructors for x and y. |
---|
[dc2334c] | 568 | // Explicitly mutating children instead of mutating the inner compound statment forces the temporaries to be added |
---|
| 569 | // to the outer context, rather than inside of the statement expression. |
---|
| 570 | visit_children = false; |
---|
[65aca88] | 571 | std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids(); |
---|
| 572 | for ( Statement *& stmt : stmts ) { |
---|
[dc2334c] | 573 | stmt = stmt->acceptMutator( *visitor ); |
---|
[65aca88] | 574 | } // for |
---|
[31f379c] | 575 | assert( stmtExpr->get_result() ); |
---|
| 576 | Type * result = stmtExpr->get_result(); |
---|
| 577 | if ( ! result->isVoid() ) { |
---|
| 578 | for ( ObjectDecl * obj : stmtExpr->get_returnDecls() ) { |
---|
[dc2334c] | 579 | stmtsToAddBefore.push_back( new DeclStmt( noLabels, obj ) ); |
---|
[31f379c] | 580 | } // for |
---|
| 581 | // add destructors after current statement |
---|
| 582 | for ( Expression * dtor : stmtExpr->get_dtors() ) { |
---|
| 583 | stmtsToAddAfter.push_back( new ExprStmt( noLabels, dtor ) ); |
---|
| 584 | } // for |
---|
| 585 | // must have a non-empty body, otherwise it wouldn't have a result |
---|
[dc2334c] | 586 | assert( ! stmts.empty() ); |
---|
[31f379c] | 587 | assert( ! stmtExpr->get_returnDecls().empty() ); |
---|
[dc2334c] | 588 | stmts.push_back( new ExprStmt( noLabels, new VariableExpr( stmtExpr->get_returnDecls().front() ) ) ); |
---|
[a28bc02] | 589 | stmtExpr->get_returnDecls().clear(); |
---|
| 590 | stmtExpr->get_dtors().clear(); |
---|
[31f379c] | 591 | } |
---|
[a28bc02] | 592 | assert( stmtExpr->get_returnDecls().empty() ); |
---|
| 593 | assert( stmtExpr->get_dtors().empty() ); |
---|
[31f379c] | 594 | } |
---|
| 595 | |
---|
[dc2334c] | 596 | void FixCopyCtors::premutate( UniqueExpr * unqExpr ) { |
---|
| 597 | visit_children = false; |
---|
[597db97] | 598 | unqCount[ unqExpr->get_id() ]--; |
---|
| 599 | static std::unordered_map< int, std::list< Statement * > > dtors; |
---|
[141b786] | 600 | static std::unordered_map< int, UniqueExpr * > unqMap; |
---|
| 601 | // has to be done to clean up ImplicitCopyCtorExpr nodes, even when this node was skipped in previous passes |
---|
| 602 | if ( unqMap.count( unqExpr->get_id() ) ) { |
---|
| 603 | // take data from other UniqueExpr to ensure consistency |
---|
| 604 | delete unqExpr->get_expr(); |
---|
| 605 | unqExpr->set_expr( unqMap[unqExpr->get_id()]->get_expr()->clone() ); |
---|
| 606 | delete unqExpr->get_result(); |
---|
| 607 | unqExpr->set_result( maybeClone( unqExpr->get_expr()->get_result() ) ); |
---|
[597db97] | 608 | if ( unqCount[ unqExpr->get_id() ] == 0 ) { // insert destructor after the last use of the unique expression |
---|
[edbdbe6] | 609 | stmtsToAddAfter.splice( stmtsToAddAfter.end(), dtors[ unqExpr->get_id() ] ); |
---|
[597db97] | 610 | } |
---|
[dc2334c] | 611 | return; |
---|
[141b786] | 612 | } |
---|
[dc2334c] | 613 | PassVisitor<FixCopyCtors> fixer( unqCount ); |
---|
[597db97] | 614 | unqExpr->set_expr( unqExpr->get_expr()->acceptMutator( fixer ) ); // stmtexprs contained should not be separately fixed, so this must occur after the lookup |
---|
[dc2334c] | 615 | stmtsToAddBefore.splice( stmtsToAddBefore.end(), fixer.pass.stmtsToAddBefore ); |
---|
[141b786] | 616 | unqMap[unqExpr->get_id()] = unqExpr; |
---|
[edbdbe6] | 617 | if ( unqCount[ unqExpr->get_id() ] == 0 ) { // insert destructor after the last use of the unique expression |
---|
| 618 | stmtsToAddAfter.splice( stmtsToAddAfter.end(), dtors[ unqExpr->get_id() ] ); |
---|
| 619 | } else { // remember dtors for last instance of unique expr |
---|
[dc2334c] | 620 | dtors[ unqExpr->get_id() ] = fixer.pass.stmtsToAddAfter; |
---|
[141b786] | 621 | } |
---|
[dc2334c] | 622 | return; |
---|
[141b786] | 623 | } |
---|
| 624 | |
---|
[5363fdf] | 625 | DeclarationWithType * FixInit::postmutate( ObjectDecl *objDecl ) { |
---|
[aff3af4] | 626 | // since this removes the init field from objDecl, it must occur after children are mutated (i.e. postmutate) |
---|
[c2931ea] | 627 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 628 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 629 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 630 | if ( Statement * ctor = ctorInit->get_ctor() ) { |
---|
[08d5507b] | 631 | if ( objDecl->get_storageClasses().is_static ) { |
---|
[72e9222] | 632 | // originally wanted to take advantage of gcc nested functions, but |
---|
[f9cebb5] | 633 | // we get memory errors with this approach. To remedy this, the static |
---|
| 634 | // variable is hoisted when the destructor needs to be called. |
---|
[72e9222] | 635 | // |
---|
[c2931ea] | 636 | // generate: |
---|
[f9cebb5] | 637 | // static T __objName_static_varN; |
---|
[72e9222] | 638 | // void __objName_dtor_atexitN() { |
---|
[f9cebb5] | 639 | // __dtor__...; |
---|
[72e9222] | 640 | // } |
---|
| 641 | // int f(...) { |
---|
| 642 | // ... |
---|
| 643 | // static bool __objName_uninitialized = true; |
---|
| 644 | // if (__objName_uninitialized) { |
---|
| 645 | // __ctor(__objName); |
---|
| 646 | // __objName_uninitialized = false; |
---|
[f9cebb5] | 647 | // atexit(__objName_dtor_atexitN); |
---|
[c2931ea] | 648 | // } |
---|
[72e9222] | 649 | // ... |
---|
[c2931ea] | 650 | // } |
---|
| 651 | |
---|
[72e9222] | 652 | static UniqueName dtorCallerNamer( "_dtor_atexit" ); |
---|
| 653 | |
---|
| 654 | // static bool __objName_uninitialized = true |
---|
[c2931ea] | 655 | BasicType * boolType = new BasicType( Type::Qualifiers(), BasicType::Bool ); |
---|
[579263a] | 656 | SingleInit * boolInitExpr = new SingleInit( new ConstantExpr( Constant::from_int( 1 ) ) ); |
---|
[68fe077a] | 657 | ObjectDecl * isUninitializedVar = new ObjectDecl( objDecl->get_mangleName() + "_uninitialized", Type::StorageClasses( Type::Static ), LinkageSpec::Cforall, 0, boolType, boolInitExpr ); |
---|
[c2931ea] | 658 | isUninitializedVar->fixUniqueId(); |
---|
| 659 | |
---|
| 660 | // __objName_uninitialized = false; |
---|
| 661 | UntypedExpr * setTrue = new UntypedExpr( new NameExpr( "?=?" ) ); |
---|
| 662 | setTrue->get_args().push_back( new VariableExpr( isUninitializedVar ) ); |
---|
[d56e5bc] | 663 | setTrue->get_args().push_back( new ConstantExpr( Constant::from_int( 0 ) ) ); |
---|
[c2931ea] | 664 | |
---|
| 665 | // generate body of if |
---|
| 666 | CompoundStmt * initStmts = new CompoundStmt( noLabels ); |
---|
| 667 | std::list< Statement * > & body = initStmts->get_kids(); |
---|
| 668 | body.push_back( ctor ); |
---|
| 669 | body.push_back( new ExprStmt( noLabels, setTrue ) ); |
---|
| 670 | |
---|
| 671 | // put it all together |
---|
| 672 | IfStmt * ifStmt = new IfStmt( noLabels, new VariableExpr( isUninitializedVar ), initStmts, 0 ); |
---|
| 673 | stmtsToAddAfter.push_back( new DeclStmt( noLabels, isUninitializedVar ) ); |
---|
| 674 | stmtsToAddAfter.push_back( ifStmt ); |
---|
[72e9222] | 675 | |
---|
[a4dd728] | 676 | Statement * dtor = ctorInit->get_dtor(); |
---|
[62423350] | 677 | objDecl->set_init( nullptr ); |
---|
| 678 | ctorInit->set_ctor( nullptr ); |
---|
[a4dd728] | 679 | ctorInit->set_dtor( nullptr ); |
---|
| 680 | if ( dtor ) { |
---|
[f9cebb5] | 681 | // if the object has a non-trivial destructor, have to |
---|
| 682 | // hoist it and the object into the global space and |
---|
| 683 | // call the destructor function with atexit. |
---|
| 684 | |
---|
[a4dd728] | 685 | Statement * dtorStmt = dtor->clone(); |
---|
[f9cebb5] | 686 | |
---|
| 687 | // void __objName_dtor_atexitN(...) {...} |
---|
[68fe077a] | 688 | FunctionDecl * dtorCaller = new FunctionDecl( objDecl->get_mangleName() + dtorCallerNamer.newName(), Type::StorageClasses( Type::Static ), LinkageSpec::C, new FunctionType( Type::Qualifiers(), false ), new CompoundStmt( noLabels ) ); |
---|
[f9cebb5] | 689 | dtorCaller->fixUniqueId(); |
---|
[c8dfcd3] | 690 | dtorCaller->get_statements()->push_back( dtorStmt ); |
---|
[f9cebb5] | 691 | |
---|
| 692 | // atexit(dtor_atexit); |
---|
| 693 | UntypedExpr * callAtexit = new UntypedExpr( new NameExpr( "atexit" ) ); |
---|
| 694 | callAtexit->get_args().push_back( new VariableExpr( dtorCaller ) ); |
---|
| 695 | |
---|
| 696 | body.push_back( new ExprStmt( noLabels, callAtexit ) ); |
---|
| 697 | |
---|
| 698 | // hoist variable and dtor caller decls to list of decls that will be added into global scope |
---|
| 699 | staticDtorDecls.push_back( objDecl ); |
---|
| 700 | staticDtorDecls.push_back( dtorCaller ); |
---|
| 701 | |
---|
| 702 | // need to rename object uniquely since it now appears |
---|
| 703 | // at global scope and there could be multiple function-scoped |
---|
| 704 | // static variables with the same name in different functions. |
---|
[c8dfcd3] | 705 | // Note: it isn't sufficient to modify only the mangleName, because |
---|
| 706 | // then subsequent Indexer passes can choke on seeing the object's name |
---|
| 707 | // if another object has the same name and type. An unfortunate side-effect |
---|
| 708 | // of renaming the object is that subsequent NameExprs may fail to resolve, |
---|
| 709 | // but there shouldn't be any remaining past this point. |
---|
[f9cebb5] | 710 | static UniqueName staticNamer( "_static_var" ); |
---|
[c8dfcd3] | 711 | objDecl->set_name( objDecl->get_name() + staticNamer.newName() ); |
---|
| 712 | objDecl->set_mangleName( SymTab::Mangler::mangle( objDecl ) ); |
---|
[f9cebb5] | 713 | |
---|
| 714 | // xxx - temporary hack: need to return a declaration, but want to hoist the current object out of this scope |
---|
| 715 | // create a new object which is never used |
---|
| 716 | static UniqueName dummyNamer( "_dummy" ); |
---|
[68fe077a] | 717 | 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] | 718 | delete ctorInit; |
---|
[f9cebb5] | 719 | return dummy; |
---|
| 720 | } |
---|
[c2931ea] | 721 | } else { |
---|
[e3e16bc] | 722 | ImplicitCtorDtorStmt * implicit = strict_dynamic_cast< ImplicitCtorDtorStmt * > ( ctor ); |
---|
[5363fdf] | 723 | ExprStmt * ctorStmt = dynamic_cast< ExprStmt * >( implicit->callStmt ); |
---|
[233e4d9] | 724 | ApplicationExpr * ctorCall = nullptr; |
---|
[5363fdf] | 725 | if ( ctorStmt && (ctorCall = isIntrinsicCallExpr( ctorStmt->expr )) && ctorCall->get_args().size() == 2 ) { |
---|
[233e4d9] | 726 | // clean up intrinsic copy constructor calls by making them into SingleInits |
---|
[5363fdf] | 727 | objDecl->init = new SingleInit( ctorCall->args.back() ); |
---|
| 728 | ctorCall->args.pop_back(); |
---|
[233e4d9] | 729 | } else { |
---|
| 730 | stmtsToAddAfter.push_back( ctor ); |
---|
[5363fdf] | 731 | objDecl->init = nullptr; |
---|
| 732 | ctorInit->ctor = nullptr; |
---|
[233e4d9] | 733 | } |
---|
[adcc065] | 734 | } // if |
---|
[5363fdf] | 735 | } else if ( Initializer * init = ctorInit->init ) { |
---|
| 736 | objDecl->init = init; |
---|
| 737 | ctorInit->init = nullptr; |
---|
[c2931ea] | 738 | } else { |
---|
| 739 | // no constructor and no initializer, which is okay |
---|
[5363fdf] | 740 | objDecl->init = nullptr; |
---|
[adcc065] | 741 | } // if |
---|
[c2931ea] | 742 | delete ctorInit; |
---|
[adcc065] | 743 | } // if |
---|
[c2931ea] | 744 | return objDecl; |
---|
[db4ecc5] | 745 | } |
---|
| 746 | |
---|
[698ec72] | 747 | void ObjDeclCollector::previsit( CompoundStmt * ) { |
---|
| 748 | GuardValue( curVars ); |
---|
[db4ecc5] | 749 | } |
---|
| 750 | |
---|
[698ec72] | 751 | void ObjDeclCollector::previsit( DeclStmt * stmt ) { |
---|
[4b2589a] | 752 | // keep track of all variables currently in scope |
---|
[c2931ea] | 753 | if ( ObjectDecl * objDecl = dynamic_cast< ObjectDecl * > ( stmt->get_decl() ) ) { |
---|
[62423350] | 754 | curVars.push_back( objDecl ); |
---|
[adcc065] | 755 | } // if |
---|
[db4ecc5] | 756 | } |
---|
| 757 | |
---|
[698ec72] | 758 | void LabelFinder::previsit( Statement * stmt ) { |
---|
[4b2589a] | 759 | // for each label, remember the variables in scope at that label. |
---|
[c2931ea] | 760 | for ( Label l : stmt->get_labels() ) { |
---|
| 761 | vars[l] = curVars; |
---|
[adcc065] | 762 | } // for |
---|
[71f4e4f] | 763 | } |
---|
[f1e012b] | 764 | |
---|
[698ec72] | 765 | void LabelFinder::previsit( CompoundStmt * stmt ) { |
---|
| 766 | previsit( (Statement *)stmt ); |
---|
| 767 | Parent::previsit( stmt ); |
---|
| 768 | } |
---|
| 769 | |
---|
| 770 | void LabelFinder::previsit( DeclStmt * stmt ) { |
---|
| 771 | previsit( (Statement *)stmt ); |
---|
| 772 | Parent::previsit( stmt ); |
---|
| 773 | } |
---|
| 774 | |
---|
| 775 | |
---|
[ec79847] | 776 | template<typename Iterator, typename OutputIterator> |
---|
| 777 | void insertDtors( Iterator begin, Iterator end, OutputIterator out ) { |
---|
| 778 | for ( Iterator it = begin ; it != end ; ++it ) { |
---|
[adcc065] | 779 | // extract destructor statement from the object decl and insert it into the output. Note that this is |
---|
| 780 | // only called on lists of non-static objects with implicit non-intrinsic dtors, so if the user manually |
---|
| 781 | // calls an intrinsic dtor then the call must (and will) still be generated since the argument may |
---|
| 782 | // contain side effects. |
---|
[c2931ea] | 783 | ObjectDecl * objDecl = *it; |
---|
| 784 | ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ); |
---|
| 785 | assert( ctorInit && ctorInit->get_dtor() ); |
---|
| 786 | *out++ = ctorInit->get_dtor()->clone(); |
---|
[adcc065] | 787 | } // for |
---|
[f1e012b] | 788 | } |
---|
[39786813] | 789 | |
---|
[698ec72] | 790 | void InsertDtors::previsit( ObjectDecl * objDecl ) { |
---|
[c2931ea] | 791 | // remember non-static destructed objects so that their destructors can be inserted later |
---|
[08d5507b] | 792 | if ( ! objDecl->get_storageClasses().is_static ) { |
---|
[c2931ea] | 793 | if ( ConstructorInit * ctorInit = dynamic_cast< ConstructorInit * >( objDecl->get_init() ) ) { |
---|
| 794 | // a decision should have been made by the resolver, so ctor and init are not both non-NULL |
---|
| 795 | assert( ! ctorInit->get_ctor() || ! ctorInit->get_init() ); |
---|
| 796 | Statement * dtor = ctorInit->get_dtor(); |
---|
[e4d6335] | 797 | // don't need to call intrinsic dtor, because it does nothing, but |
---|
| 798 | // non-intrinsic dtors must be called |
---|
[f9cebb5] | 799 | if ( dtor && ! isIntrinsicSingleArgCallStmt( dtor ) ) { |
---|
[e4d6335] | 800 | // set dtor location to the object's location for error messages |
---|
| 801 | ctorInit->dtor->location = objDecl->location; |
---|
[c2931ea] | 802 | reverseDeclOrder.front().push_front( objDecl ); |
---|
[adcc065] | 803 | } // if |
---|
| 804 | } // if |
---|
| 805 | } // if |
---|
[52c14b3] | 806 | } |
---|
| 807 | |
---|
[698ec72] | 808 | void InsertDtors::previsit( FunctionDecl * funcDecl ) { |
---|
[52c14b3] | 809 | // each function needs to have its own set of labels |
---|
[698ec72] | 810 | GuardValue( labelVars ); |
---|
[52c14b3] | 811 | labelVars.clear(); |
---|
[680620d] | 812 | // LabelFinder does not recurse into FunctionDecl, so need to visit |
---|
| 813 | // its children manually. |
---|
[698ec72] | 814 | maybeAccept( funcDecl->type, finder ); |
---|
| 815 | maybeAccept( funcDecl->statements, finder ); |
---|
[52c14b3] | 816 | |
---|
[698ec72] | 817 | // all labels for this function have been collected, insert destructors as appropriate via implicit recursion. |
---|
[52c14b3] | 818 | } |
---|
| 819 | |
---|
[698ec72] | 820 | void InsertDtors::previsit( CompoundStmt * compoundStmt ) { |
---|
[adcc065] | 821 | // visit statements - this will also populate reverseDeclOrder list. don't want to dump all destructors |
---|
| 822 | // when block is left, just the destructors associated with variables defined in this block, so push a new |
---|
| 823 | // list to the top of the stack so that we can differentiate scopes |
---|
[c2931ea] | 824 | reverseDeclOrder.push_front( OrderedDecls() ); |
---|
[698ec72] | 825 | Parent::previsit( compoundStmt ); |
---|
| 826 | } |
---|
[39786813] | 827 | |
---|
[698ec72] | 828 | void InsertDtors::postvisit( CompoundStmt * compoundStmt ) { |
---|
[0661678] | 829 | // add destructors for the current scope that we're exiting, unless the last statement is a return, which |
---|
| 830 | // causes unreachable code warnings |
---|
[c2931ea] | 831 | std::list< Statement * > & statements = compoundStmt->get_kids(); |
---|
[0661678] | 832 | if ( ! statements.empty() && ! dynamic_cast< ReturnStmt * >( statements.back() ) ) { |
---|
| 833 | insertDtors( reverseDeclOrder.front().begin(), reverseDeclOrder.front().end(), back_inserter( statements ) ); |
---|
| 834 | } |
---|
[c2931ea] | 835 | reverseDeclOrder.pop_front(); |
---|
[39786813] | 836 | } |
---|
| 837 | |
---|
[698ec72] | 838 | void InsertDtors::previsit( ReturnStmt * ) { |
---|
[4b2589a] | 839 | // return exits all scopes, so dump destructors for all scopes |
---|
[c2931ea] | 840 | for ( OrderedDecls & od : reverseDeclOrder ) { |
---|
[698ec72] | 841 | insertDtors( od.begin(), od.end(), back_inserter( stmtsToAddBefore ) ); |
---|
[adcc065] | 842 | } // for |
---|
[39786813] | 843 | } |
---|
[f1e012b] | 844 | |
---|
[adcc065] | 845 | // Handle break/continue/goto in the same manner as C++. Basic idea: any objects that are in scope at the |
---|
| 846 | // BranchStmt but not at the labelled (target) statement must be destructed. If there are any objects in scope |
---|
| 847 | // at the target location but not at the BranchStmt then those objects would be uninitialized so notify the user |
---|
| 848 | // of the error. See C++ Reference 6.6 Jump Statements for details. |
---|
[c2931ea] | 849 | void InsertDtors::handleGoto( BranchStmt * stmt ) { |
---|
[5809461] | 850 | // can't do anything for computed goto |
---|
| 851 | if ( stmt->computedTarget ) return; |
---|
| 852 | |
---|
| 853 | assertf( stmt->get_target() != "", "BranchStmt missing a label: %s", toString( stmt ).c_str() ); |
---|
[c2931ea] | 854 | // S_L = lvars = set of objects in scope at label definition |
---|
| 855 | // S_G = curVars = set of objects in scope at goto statement |
---|
| 856 | ObjectSet & lvars = labelVars[ stmt->get_target() ]; |
---|
| 857 | |
---|
| 858 | DTOR_PRINT( |
---|
| 859 | std::cerr << "at goto label: " << stmt->get_target().get_name() << std::endl; |
---|
| 860 | std::cerr << "S_G = " << printSet( curVars ) << std::endl; |
---|
| 861 | std::cerr << "S_L = " << printSet( lvars ) << std::endl; |
---|
| 862 | ) |
---|
| 863 | |
---|
| 864 | ObjectSet diff; |
---|
| 865 | // S_L-S_G results in set of objects whose construction is skipped - it's an error if this set is non-empty |
---|
| 866 | std::set_difference( lvars.begin(), lvars.end(), curVars.begin(), curVars.end(), std::inserter( diff, diff.begin() ) ); |
---|
| 867 | DTOR_PRINT( |
---|
| 868 | std::cerr << "S_L-S_G = " << printSet( diff ) << std::endl; |
---|
| 869 | ) |
---|
| 870 | if ( ! diff.empty() ) { |
---|
| 871 | throw SemanticError( std::string("jump to label '") + stmt->get_target().get_name() + "' crosses initialization of " + (*diff.begin())->get_name() + " ", stmt ); |
---|
[adcc065] | 872 | } // if |
---|
[c2931ea] | 873 | // S_G-S_L results in set of objects that must be destructed |
---|
| 874 | diff.clear(); |
---|
| 875 | std::set_difference( curVars.begin(), curVars.end(), lvars.begin(), lvars.end(), std::inserter( diff, diff.end() ) ); |
---|
| 876 | DTOR_PRINT( |
---|
| 877 | std::cerr << "S_G-S_L = " << printSet( diff ) << std::endl; |
---|
| 878 | ) |
---|
| 879 | if ( ! diff.empty() ) { |
---|
[62423350] | 880 | // create an auxilliary set for fast lookup -- can't make diff a set, because diff ordering should be consistent for error messages. |
---|
| 881 | std::unordered_set<ObjectDecl *> needsDestructor( diff.begin(), diff.end() ); |
---|
| 882 | |
---|
[c2931ea] | 883 | // go through decl ordered list of objectdecl. for each element that occurs in diff, output destructor |
---|
| 884 | OrderedDecls ordered; |
---|
| 885 | for ( OrderedDecls & rdo : reverseDeclOrder ) { |
---|
| 886 | // add elements from reverseDeclOrder into ordered if they occur in diff - it is key that this happens in reverse declaration order. |
---|
[62423350] | 887 | copy_if( rdo.begin(), rdo.end(), back_inserter( ordered ), [&]( ObjectDecl * objDecl ) { return needsDestructor.count( objDecl ); } ); |
---|
[adcc065] | 888 | } // for |
---|
[698ec72] | 889 | insertDtors( ordered.begin(), ordered.end(), back_inserter( stmtsToAddBefore ) ); |
---|
[adcc065] | 890 | } // if |
---|
[c2931ea] | 891 | } |
---|
[39786813] | 892 | |
---|
[698ec72] | 893 | void InsertDtors::previsit( BranchStmt * stmt ) { |
---|
[c2931ea] | 894 | switch( stmt->get_type() ) { |
---|
[adcc065] | 895 | case BranchStmt::Continue: |
---|
| 896 | case BranchStmt::Break: |
---|
| 897 | // could optimize the break/continue case, because the S_L-S_G check is unnecessary (this set should |
---|
| 898 | // always be empty), but it serves as a small sanity check. |
---|
| 899 | case BranchStmt::Goto: |
---|
| 900 | handleGoto( stmt ); |
---|
| 901 | break; |
---|
| 902 | default: |
---|
| 903 | assert( false ); |
---|
| 904 | } // switch |
---|
[c2931ea] | 905 | } |
---|
[79970ed] | 906 | |
---|
| 907 | bool checkWarnings( FunctionDecl * funcDecl ) { |
---|
| 908 | // only check for warnings if the current function is a user-defined |
---|
| 909 | // constructor or destructor |
---|
| 910 | if ( ! funcDecl ) return false; |
---|
| 911 | if ( ! funcDecl->get_statements() ) return false; |
---|
[bff227f] | 912 | return CodeGen::isCtorDtor( funcDecl->get_name() ) && ! LinkageSpec::isOverridable( funcDecl->get_linkage() ); |
---|
[79970ed] | 913 | } |
---|
| 914 | |
---|
[5363fdf] | 915 | void addIds( SymTab::Indexer & indexer, const std::list< DeclarationWithType * > & decls ) { |
---|
| 916 | for ( auto d : decls ) { |
---|
| 917 | indexer.addId( d ); |
---|
| 918 | } |
---|
| 919 | } |
---|
| 920 | |
---|
| 921 | void addTypes( SymTab::Indexer & indexer, const std::list< TypeDecl * > & tds ) { |
---|
| 922 | for ( auto td : tds ) { |
---|
| 923 | indexer.addType( td ); |
---|
| 924 | addIds( indexer, td->assertions ); |
---|
| 925 | } |
---|
| 926 | } |
---|
| 927 | |
---|
[9a707e4e] | 928 | void GenStructMemberCalls::previsit( FunctionDecl * funcDecl ) { |
---|
[5363fdf] | 929 | GuardValue( function ); |
---|
[9a707e4e] | 930 | GuardValue( unhandled ); |
---|
| 931 | GuardValue( usedUninit ); |
---|
| 932 | GuardValue( thisParam ); |
---|
| 933 | GuardValue( isCtor ); |
---|
| 934 | GuardValue( structDecl ); |
---|
[64ac636] | 935 | errors = SemanticError(); // clear previous errors |
---|
[c8dfcd3] | 936 | |
---|
| 937 | // need to start with fresh sets |
---|
| 938 | unhandled.clear(); |
---|
| 939 | usedUninit.clear(); |
---|
[79970ed] | 940 | |
---|
| 941 | function = funcDecl; |
---|
[bff227f] | 942 | isCtor = CodeGen::isConstructor( function->get_name() ); |
---|
[c8dfcd3] | 943 | if ( checkWarnings( function ) ) { |
---|
| 944 | FunctionType * type = function->get_functionType(); |
---|
[79970ed] | 945 | assert( ! type->get_parameters().empty() ); |
---|
[e3e16bc] | 946 | thisParam = strict_dynamic_cast< ObjectDecl * >( type->get_parameters().front() ); |
---|
[0a81c3f] | 947 | Type * thisType = getPointerBase( thisParam->get_type() ); |
---|
| 948 | StructInstType * structType = dynamic_cast< StructInstType * >( thisType ); |
---|
[79970ed] | 949 | if ( structType ) { |
---|
[44f6341] | 950 | structDecl = structType->get_baseStruct(); |
---|
[79970ed] | 951 | for ( Declaration * member : structDecl->get_members() ) { |
---|
| 952 | if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( member ) ) { |
---|
| 953 | // record all of the struct type's members that need to be constructed or |
---|
| 954 | // destructed by the end of the function |
---|
| 955 | unhandled.insert( field ); |
---|
| 956 | } |
---|
| 957 | } |
---|
| 958 | } |
---|
| 959 | } |
---|
[9a707e4e] | 960 | } |
---|
| 961 | |
---|
| 962 | void GenStructMemberCalls::postvisit( FunctionDecl * funcDecl ) { |
---|
[c8dfcd3] | 963 | // remove the unhandled objects from usedUninit, because a call is inserted |
---|
| 964 | // to handle them - only objects that are later constructed are used uninitialized. |
---|
[64ac636] | 965 | std::map< DeclarationWithType *, CodeLocation > diff; |
---|
| 966 | // need the comparator since usedUninit and unhandled have different types |
---|
| 967 | struct comp_t { |
---|
| 968 | typedef decltype(usedUninit)::value_type usedUninit_t; |
---|
| 969 | typedef decltype(unhandled)::value_type unhandled_t; |
---|
| 970 | bool operator()(usedUninit_t x, unhandled_t y) { return x.first < y; } |
---|
| 971 | bool operator()(unhandled_t x, usedUninit_t y) { return x < y.first; } |
---|
| 972 | } comp; |
---|
| 973 | std::set_difference( usedUninit.begin(), usedUninit.end(), unhandled.begin(), unhandled.end(), std::inserter( diff, diff.begin() ), comp ); |
---|
| 974 | for ( auto p : diff ) { |
---|
| 975 | DeclarationWithType * member = p.first; |
---|
| 976 | CodeLocation loc = p.second; |
---|
| 977 | // xxx - make error message better by also tracking the location that the object is constructed at? |
---|
| 978 | emit( loc, "in ", CodeGen::genPrettyType( function->get_functionType(), function->get_name() ), ", field ", member->get_name(), " used before being constructed" ); |
---|
[79970ed] | 979 | } |
---|
| 980 | |
---|
[c8dfcd3] | 981 | if ( ! unhandled.empty() ) { |
---|
[4618319] | 982 | // need to explicitly re-add function parameters to the indexer in order to resolve copy constructors |
---|
[9a707e4e] | 983 | auto guard = makeFuncGuard( [this]() { indexer.enterScope(); }, [this]() { indexer.leaveScope(); } ); |
---|
| 984 | addTypes( indexer, function->type->forall ); |
---|
| 985 | addIds( indexer, function->type->returnVals ); |
---|
| 986 | addIds( indexer, function->type->parameters ); |
---|
[44f6341] | 987 | |
---|
| 988 | // need to iterate through members in reverse in order for |
---|
| 989 | // ctor/dtor statements to come out in the right order |
---|
[1ba88a0] | 990 | for ( Declaration * member : reverseIterate( structDecl->get_members() ) ) { |
---|
[44f6341] | 991 | DeclarationWithType * field = dynamic_cast< DeclarationWithType * >( member ); |
---|
| 992 | // skip non-DWT members |
---|
| 993 | if ( ! field ) continue; |
---|
[05807e9] | 994 | // skip non-constructable members |
---|
| 995 | if ( ! tryConstruct( field ) ) continue; |
---|
[44f6341] | 996 | // skip handled members |
---|
| 997 | if ( ! unhandled.count( field ) ) continue; |
---|
| 998 | |
---|
| 999 | // insert and resolve default/copy constructor call for each field that's unhandled |
---|
[c8dfcd3] | 1000 | std::list< Statement * > stmt; |
---|
[4d4882a] | 1001 | Expression * arg2 = 0; |
---|
| 1002 | if ( isCopyConstructor( function ) ) { |
---|
[44f6341] | 1003 | // if copy ctor, need to pass second-param-of-this-function.field |
---|
[4d4882a] | 1004 | std::list< DeclarationWithType * > & params = function->get_functionType()->get_parameters(); |
---|
| 1005 | assert( params.size() == 2 ); |
---|
[44f6341] | 1006 | arg2 = new MemberExpr( field, new VariableExpr( params.back() ) ); |
---|
[4d4882a] | 1007 | } |
---|
| 1008 | InitExpander srcParam( arg2 ); |
---|
[4618319] | 1009 | // cast away reference type and construct field. |
---|
| 1010 | Expression * thisExpr = new CastExpr( new VariableExpr( thisParam ), thisParam->get_type()->stripReferences()->clone() ); |
---|
| 1011 | Expression * memberDest = new MemberExpr( field, thisExpr ); |
---|
| 1012 | SymTab::genImplicitCall( srcParam, memberDest, function->get_name(), back_inserter( stmt ), field, isCtor ); |
---|
[c8dfcd3] | 1013 | |
---|
| 1014 | assert( stmt.size() <= 1 ); |
---|
| 1015 | if ( stmt.size() == 1 ) { |
---|
| 1016 | Statement * callStmt = stmt.front(); |
---|
| 1017 | |
---|
[9a707e4e] | 1018 | MutatingResolver resolver( indexer ); |
---|
[c8dfcd3] | 1019 | try { |
---|
| 1020 | callStmt->acceptMutator( resolver ); |
---|
| 1021 | if ( isCtor ) { |
---|
| 1022 | function->get_statements()->push_front( callStmt ); |
---|
| 1023 | } else { |
---|
| 1024 | // destructor statements should be added at the end |
---|
| 1025 | function->get_statements()->push_back( callStmt ); |
---|
| 1026 | } |
---|
| 1027 | } catch ( SemanticError & error ) { |
---|
[64ac636] | 1028 | 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] | 1029 | } |
---|
| 1030 | } |
---|
| 1031 | } |
---|
| 1032 | } |
---|
[64ac636] | 1033 | if (! errors.isEmpty()) { |
---|
| 1034 | throw errors; |
---|
| 1035 | } |
---|
[79970ed] | 1036 | } |
---|
| 1037 | |
---|
[4618319] | 1038 | /// true if expr is effectively just the 'this' parameter |
---|
| 1039 | bool isThisExpression( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1040 | // TODO: there are more complicated ways to pass 'this' to a constructor, e.g. &*, *&, etc. |
---|
| 1041 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) { |
---|
| 1042 | return varExpr->get_var() == thisParam; |
---|
| 1043 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( expr ) ) { |
---|
| 1044 | return isThisExpression( castExpr->get_arg(), thisParam ); |
---|
| 1045 | } |
---|
| 1046 | return false; |
---|
| 1047 | } |
---|
| 1048 | |
---|
| 1049 | /// returns a MemberExpr if expr is effectively just member access on the 'this' parameter, else nullptr |
---|
| 1050 | MemberExpr * isThisMemberExpr( Expression * expr, DeclarationWithType * thisParam ) { |
---|
| 1051 | if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) { |
---|
| 1052 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1053 | return memberExpr; |
---|
| 1054 | } |
---|
| 1055 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) { |
---|
| 1056 | return isThisMemberExpr( castExpr->get_arg(), thisParam ); |
---|
| 1057 | } |
---|
| 1058 | return nullptr; |
---|
| 1059 | } |
---|
| 1060 | |
---|
[9a707e4e] | 1061 | void GenStructMemberCalls::previsit( ApplicationExpr * appExpr ) { |
---|
| 1062 | if ( ! checkWarnings( function ) ) { |
---|
| 1063 | visit_children = false; |
---|
| 1064 | return; |
---|
| 1065 | } |
---|
[79970ed] | 1066 | |
---|
| 1067 | std::string fname = getFunctionName( appExpr ); |
---|
| 1068 | if ( fname == function->get_name() ) { |
---|
| 1069 | // call to same kind of function |
---|
| 1070 | Expression * firstParam = appExpr->get_args().front(); |
---|
| 1071 | |
---|
[4618319] | 1072 | if ( isThisExpression( firstParam, thisParam ) ) { |
---|
[79970ed] | 1073 | // if calling another constructor on thisParam, assume that function handles |
---|
| 1074 | // all members - if it doesn't a warning will appear in that function. |
---|
[4618319] | 1075 | unhandled.clear(); |
---|
| 1076 | } else if ( MemberExpr * memberExpr = isThisMemberExpr( firstParam, thisParam ) ) { |
---|
| 1077 | // if first parameter is a member expression on the this parameter, |
---|
| 1078 | // then remove the member from unhandled set. |
---|
| 1079 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1080 | unhandled.erase( memberExpr->get_member() ); |
---|
[79970ed] | 1081 | } |
---|
| 1082 | } |
---|
| 1083 | } |
---|
| 1084 | } |
---|
| 1085 | |
---|
[9a707e4e] | 1086 | void GenStructMemberCalls::previsit( MemberExpr * memberExpr ) { |
---|
| 1087 | if ( ! checkWarnings( function ) || ! isCtor ) { |
---|
| 1088 | visit_children = false; |
---|
| 1089 | return; |
---|
| 1090 | } |
---|
[79970ed] | 1091 | |
---|
[4618319] | 1092 | if ( isThisExpression( memberExpr->get_aggregate(), thisParam ) ) { |
---|
| 1093 | if ( unhandled.count( memberExpr->get_member() ) ) { |
---|
| 1094 | // emit a warning because a member was used before it was constructed |
---|
| 1095 | usedUninit.insert( { memberExpr->get_member(), memberExpr->location } ); |
---|
[79970ed] | 1096 | } |
---|
| 1097 | } |
---|
| 1098 | } |
---|
[3906301] | 1099 | |
---|
| 1100 | template< typename Visitor, typename... Params > |
---|
[64ac636] | 1101 | void error( Visitor & v, CodeLocation loc, const Params &... params ) { |
---|
| 1102 | SemanticError err( toString( params... ) ); |
---|
| 1103 | err.set_location( loc ); |
---|
| 1104 | v.errors.append( err ); |
---|
[3906301] | 1105 | } |
---|
| 1106 | |
---|
| 1107 | template< typename... Params > |
---|
[64ac636] | 1108 | void GenStructMemberCalls::emit( CodeLocation loc, const Params &... params ) { |
---|
[3906301] | 1109 | // toggle warnings vs. errors here. |
---|
| 1110 | // warn( params... ); |
---|
[64ac636] | 1111 | error( *this, loc, params... ); |
---|
[3906301] | 1112 | } |
---|
[c8dfcd3] | 1113 | |
---|
| 1114 | DeclarationWithType * MutatingResolver::mutate( ObjectDecl *objectDecl ) { |
---|
| 1115 | // add object to the indexer assumes that there will be no name collisions |
---|
| 1116 | // in generated code. If this changes, add mutate methods for entities with |
---|
| 1117 | // scope and call {enter,leave}Scope explicitly. |
---|
[33a25f9] | 1118 | indexer.addId( objectDecl ); |
---|
[c8dfcd3] | 1119 | return objectDecl; |
---|
| 1120 | } |
---|
| 1121 | |
---|
| 1122 | Expression* MutatingResolver::mutate( UntypedExpr *untypedExpr ) { |
---|
[e3e16bc] | 1123 | return strict_dynamic_cast< ApplicationExpr * >( ResolvExpr::findVoidExpression( untypedExpr, indexer ) ); |
---|
[c8dfcd3] | 1124 | } |
---|
[b6fe7e6] | 1125 | |
---|
[696bf6e] | 1126 | Expression * FixCtorExprs::postmutate( ConstructorExpr * ctorExpr ) { |
---|
[b6fe7e6] | 1127 | static UniqueName tempNamer( "_tmp_ctor_expr" ); |
---|
[f0121d7] | 1128 | // xxx - is the size check necessary? |
---|
[d29fa5f] | 1129 | assert( ctorExpr->result && ctorExpr->get_result()->size() == 1 ); |
---|
[b7b8674] | 1130 | |
---|
| 1131 | // 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] | 1132 | ObjectDecl * tmp = ObjectDecl::newObject( tempNamer.newName(), ctorExpr->get_result()->clone(), nullptr ); |
---|
[696bf6e] | 1133 | declsToAddBefore.push_back( tmp ); |
---|
[b6fe7e6] | 1134 | |
---|
[627f585] | 1135 | // xxx - this can be TupleAssignExpr now. Need to properly handle this case. |
---|
[e3e16bc] | 1136 | ApplicationExpr * callExpr = strict_dynamic_cast< ApplicationExpr * > ( ctorExpr->get_callExpr() ); |
---|
[b6fe7e6] | 1137 | TypeSubstitution * env = ctorExpr->get_env(); |
---|
| 1138 | ctorExpr->set_callExpr( nullptr ); |
---|
| 1139 | ctorExpr->set_env( nullptr ); |
---|
[8a6cf7e] | 1140 | delete ctorExpr; |
---|
[b6fe7e6] | 1141 | |
---|
[696bf6e] | 1142 | // build assignment and replace constructor's first argument with new temporary |
---|
[b6fe7e6] | 1143 | Expression *& firstArg = callExpr->get_args().front(); |
---|
[696bf6e] | 1144 | Expression * assign = new UntypedExpr( new NameExpr( "?=?" ), { new AddressExpr( new VariableExpr( tmp ) ), new AddressExpr( firstArg ) } ); |
---|
[8a6cf7e] | 1145 | firstArg = new VariableExpr( tmp ); |
---|
| 1146 | |
---|
[696bf6e] | 1147 | // resolve assignment and dispose of new env |
---|
| 1148 | Expression * resolvedAssign = ResolvExpr::findVoidExpression( assign, indexer ); |
---|
| 1149 | delete resolvedAssign->env; |
---|
| 1150 | resolvedAssign->env = nullptr; |
---|
| 1151 | delete assign; |
---|
| 1152 | |
---|
[8a6cf7e] | 1153 | // for constructor expr: |
---|
| 1154 | // T x; |
---|
| 1155 | // x{}; |
---|
| 1156 | // results in: |
---|
| 1157 | // T x; |
---|
| 1158 | // T & tmp; |
---|
| 1159 | // &tmp = &x, ?{}(tmp), tmp |
---|
[696bf6e] | 1160 | CommaExpr * commaExpr = new CommaExpr( resolvedAssign, new CommaExpr( callExpr, new VariableExpr( tmp ) ) ); |
---|
[b6fe7e6] | 1161 | commaExpr->set_env( env ); |
---|
| 1162 | return commaExpr; |
---|
| 1163 | } |
---|
[c2931ea] | 1164 | } // namespace |
---|
[71f4e4f] | 1165 | } // namespace InitTweak |
---|
| 1166 | |
---|
| 1167 | // Local Variables: // |
---|
| 1168 | // tab-width: 4 // |
---|
| 1169 | // mode: c++ // |
---|
| 1170 | // compile-command: "make install" // |
---|
| 1171 | // End: // |
---|