[51587aa] | 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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[906e24d] | 7 | // Lvalue.cc -- |
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[51587aa] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Mon May 18 07:44:20 2015 |
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[01aeade] | 11 | // Last Modified By : Peter A. Buhr |
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[615a096] | 12 | // Last Modified On : Fri Mar 17 09:11:18 2017 |
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| 13 | // Update Count : 5 |
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[51587aa] | 14 | // |
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[51b7345] | 15 | |
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[e3e16bc] | 16 | #include <cassert> // for strict_dynamic_cast |
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[08fc48f] | 17 | #include <string> // for string |
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[51b7345] | 18 | |
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[8135d4c] | 19 | #include "Common/PassVisitor.h" |
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[08fc48f] | 20 | #include "GenPoly.h" // for isPolyType |
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[51b7345] | 21 | #include "Lvalue.h" |
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| 22 | |
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[08fc48f] | 23 | #include "Parser/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic |
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| 24 | #include "ResolvExpr/TypeEnvironment.h" // for AssertionSet, OpenVarSet |
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| 25 | #include "ResolvExpr/Unify.h" // for unify |
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[51b7345] | 26 | #include "ResolvExpr/typeops.h" |
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[8135d4c] | 27 | #include "SymTab/Autogen.h" |
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[08fc48f] | 28 | #include "SymTab/Indexer.h" // for Indexer |
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| 29 | #include "SynTree/Declaration.h" // for Declaration, FunctionDecl |
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| 30 | #include "SynTree/Expression.h" // for Expression, ConditionalExpr |
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| 31 | #include "SynTree/Mutator.h" // for mutateAll, Mutator |
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| 32 | #include "SynTree/Statement.h" // for ReturnStmt, Statement (ptr o... |
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| 33 | #include "SynTree/Type.h" // for PointerType, Type, FunctionType |
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| 34 | #include "SynTree/Visitor.h" // for Visitor, acceptAll |
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[1d776fd] | 35 | |
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[cb43451] | 36 | #if 0 |
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| 37 | #define PRINT(x) x |
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| 38 | #else |
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| 39 | #define PRINT(x) |
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| 40 | #endif |
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| 41 | |
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[51b7345] | 42 | namespace GenPoly { |
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[01aeade] | 43 | namespace { |
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[9a34b5a] | 44 | // TODO: fold this into the general createDeref function?? |
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| 45 | Expression * mkDeref( Expression * arg ) { |
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| 46 | if ( SymTab::dereferenceOperator ) { |
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[a9b1b0c] | 47 | // note: reference depth can be arbitrarily deep here, so peel off the outermost pointer/reference, not just pointer because they are effecitvely equivalent in this pass |
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[9a34b5a] | 48 | VariableExpr * deref = new VariableExpr( SymTab::dereferenceOperator ); |
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[0690350] | 49 | deref->result = new PointerType( Type::Qualifiers(), deref->result ); |
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| 50 | Type * base = InitTweak::getPointerBase( arg->result ); |
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| 51 | assertf( base, "expected pointer type in dereference (type was %s)", toString( arg->result ).c_str() ); |
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[9a34b5a] | 52 | ApplicationExpr * ret = new ApplicationExpr( deref, { arg } ); |
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[0690350] | 53 | delete ret->result; |
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| 54 | ret->result = base->clone(); |
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| 55 | ret->result->set_lvalue( true ); |
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[9a34b5a] | 56 | return ret; |
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| 57 | } else { |
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| 58 | return UntypedExpr::createDeref( arg ); |
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| 59 | } |
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| 60 | } |
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| 61 | |
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[31cb252] | 62 | struct ReferenceConversions final : public WithStmtsToAdd { |
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[1d776fd] | 63 | Expression * postmutate( CastExpr * castExpr ); |
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[8a6cf7e] | 64 | Expression * postmutate( AddressExpr * addrExpr ); |
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[01aeade] | 65 | }; |
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| 66 | |
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[1d776fd] | 67 | /// Intrinsic functions that take reference parameters don't REALLY take reference parameters -- their reference arguments must always be implicitly dereferenced. |
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| 68 | struct FixIntrinsicArgs final { |
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[8499c707] | 69 | Expression * postmutate( ApplicationExpr * appExpr ); |
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[1d776fd] | 70 | }; |
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| 71 | |
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[9aaac6e9] | 72 | struct FixIntrinsicResult final : public WithGuards { |
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[8499c707] | 73 | Expression * postmutate( ApplicationExpr * appExpr ); |
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[9aaac6e9] | 74 | void premutate( FunctionDecl * funcDecl ); |
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| 75 | bool inIntrinsic = false; |
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[8499c707] | 76 | }; |
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[1d776fd] | 77 | |
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| 78 | /// Replace reference types with pointer types |
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| 79 | struct ReferenceTypeElimination final { |
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| 80 | Type * postmutate( ReferenceType * refType ); |
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[01aeade] | 81 | }; |
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[b6fd751] | 82 | |
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| 83 | /// GCC-like Generalized Lvalues (which have since been removed from GCC) |
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| 84 | /// https://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Lvalues.html#Lvalues |
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| 85 | /// Replaces &(a,b) with (a, &b), &(a ? b : c) with (a ? &b : &c) |
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[d335627] | 86 | struct GeneralizedLvalue final : public WithVisitorRef<GeneralizedLvalue> { |
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[1d776fd] | 87 | Expression * postmutate( AddressExpr * addressExpr ); |
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[9236060] | 88 | Expression * postmutate( MemberExpr * memExpr ); |
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[acd7c5dd] | 89 | |
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| 90 | template<typename Func> |
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| 91 | Expression * applyTransformation( Expression * expr, Expression * arg, Func mkExpr ); |
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[b6fd751] | 92 | }; |
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[cb43451] | 93 | |
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| 94 | /// Removes redundant &*/*& pattern that this pass can generate |
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| 95 | struct CollapseAddrDeref final { |
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| 96 | Expression * postmutate( AddressExpr * addressExpr ); |
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| 97 | Expression * postmutate( ApplicationExpr * appExpr ); |
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| 98 | }; |
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[8499c707] | 99 | |
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| 100 | struct AddrRef final : public WithGuards { |
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| 101 | void premutate( AddressExpr * addrExpr ); |
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| 102 | Expression * postmutate( AddressExpr * addrExpr ); |
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| 103 | void premutate( Expression * expr ); |
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| 104 | |
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| 105 | bool first = true; |
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| 106 | bool current = false; |
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| 107 | int refDepth = 0; |
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| 108 | }; |
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[01aeade] | 109 | } // namespace |
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| 110 | |
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[b0440b7] | 111 | static bool referencesEliminated = false; |
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| 112 | // used by UntypedExpr::createDeref to determine whether result type of dereference should be ReferenceType or value type. |
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| 113 | bool referencesPermissable() { |
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| 114 | return ! referencesEliminated; |
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| 115 | } |
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| 116 | |
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[b1ccdfd] | 117 | void convertLvalue( std::list< Declaration* > & translationUnit ) { |
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[1d776fd] | 118 | PassVisitor<ReferenceConversions> refCvt; |
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| 119 | PassVisitor<ReferenceTypeElimination> elim; |
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| 120 | PassVisitor<GeneralizedLvalue> genLval; |
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| 121 | PassVisitor<FixIntrinsicArgs> fixer; |
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[cb43451] | 122 | PassVisitor<CollapseAddrDeref> collapser; |
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[8499c707] | 123 | PassVisitor<AddrRef> addrRef; |
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| 124 | PassVisitor<FixIntrinsicResult> intrinsicResults; |
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| 125 | mutateAll( translationUnit, intrinsicResults ); |
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| 126 | mutateAll( translationUnit, addrRef ); |
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[1d776fd] | 127 | mutateAll( translationUnit, refCvt ); |
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| 128 | mutateAll( translationUnit, fixer ); |
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[cb43451] | 129 | mutateAll( translationUnit, collapser ); |
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[8499c707] | 130 | mutateAll( translationUnit, genLval ); |
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[8a6cf7e] | 131 | mutateAll( translationUnit, elim ); // last because other passes need reference types to work |
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[b0440b7] | 132 | |
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| 133 | // from this point forward, no other pass should create reference types. |
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| 134 | referencesEliminated = true; |
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[01aeade] | 135 | } |
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| 136 | |
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[acd7c5dd] | 137 | Expression * generalizedLvalue( Expression * expr ) { |
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[9236060] | 138 | PassVisitor<GeneralizedLvalue> genLval; |
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[acd7c5dd] | 139 | return expr->acceptMutator( genLval ); |
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| 140 | } |
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| 141 | |
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[01aeade] | 142 | namespace { |
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[8a6cf7e] | 143 | // true for intrinsic function calls that return a reference |
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[1d776fd] | 144 | bool isIntrinsicReference( Expression * expr ) { |
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[8a6cf7e] | 145 | if ( UntypedExpr * untyped = dynamic_cast< UntypedExpr * >( expr ) ) { |
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| 146 | std::string fname = InitTweak::getFunctionName( untyped ); |
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| 147 | // known intrinsic-reference prelude functions |
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| 148 | return fname == "*?" || fname == "?[?]"; |
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[1d776fd] | 149 | } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) { |
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| 150 | if ( DeclarationWithType * func = InitTweak::getFunction( appExpr ) ) { |
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[8a6cf7e] | 151 | // use type of return variable rather than expr result type, since it may have been changed to a pointer type |
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| 152 | FunctionType * ftype = GenPoly::getFunctionType( func->get_type() ); |
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[b1ccdfd] | 153 | Type * ret = ftype->returnVals.empty() ? nullptr : ftype->returnVals.front()->get_type(); |
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| 154 | return func->linkage == LinkageSpec::Intrinsic && dynamic_cast<ReferenceType *>( ret ); |
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[1d776fd] | 155 | } |
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[ce8c12f] | 156 | } |
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[1d776fd] | 157 | return false; |
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[ce8c12f] | 158 | } |
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| 159 | |
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[8499c707] | 160 | Expression * FixIntrinsicResult::postmutate( ApplicationExpr * appExpr ) { |
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| 161 | if ( isIntrinsicReference( appExpr ) ) { |
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| 162 | // eliminate reference types from intrinsic applications - now they return lvalues |
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[b1ccdfd] | 163 | Type * result = appExpr->result; |
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| 164 | appExpr->result = result->stripReferences()->clone(); |
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| 165 | appExpr->result->set_lvalue( true ); |
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[9aaac6e9] | 166 | if ( ! inIntrinsic ) { |
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| 167 | // when not in an intrinsic function, add a cast to |
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| 168 | // don't add cast when in an intrinsic function, since they already have the cast |
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| 169 | Expression * ret = new CastExpr( appExpr, result ); |
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[b1ccdfd] | 170 | std::swap( ret->env, appExpr->env ); |
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[9aaac6e9] | 171 | return ret; |
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| 172 | } |
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| 173 | delete result; |
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[8499c707] | 174 | } |
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| 175 | return appExpr; |
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| 176 | } |
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| 177 | |
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[9aaac6e9] | 178 | void FixIntrinsicResult::premutate( FunctionDecl * funcDecl ) { |
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| 179 | GuardValue( inIntrinsic ); |
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| 180 | inIntrinsic = funcDecl->linkage == LinkageSpec::Intrinsic; |
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| 181 | } |
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| 182 | |
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[1d776fd] | 183 | Expression * FixIntrinsicArgs::postmutate( ApplicationExpr * appExpr ) { |
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[9a34b5a] | 184 | // intrinsic functions don't really take reference-typed parameters, so they require an implicit dereference on their arguments. |
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[1d776fd] | 185 | if ( DeclarationWithType * function = InitTweak::getFunction( appExpr ) ) { |
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[d335627] | 186 | FunctionType * ftype = GenPoly::getFunctionType( function->get_type() ); |
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| 187 | assertf( ftype, "Function declaration does not have function type." ); |
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| 188 | // can be of differing lengths only when function is variadic |
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[b1ccdfd] | 189 | assertf( ftype->parameters.size() == appExpr->args.size() || ftype->isVarArgs, "ApplicationExpr args do not match formal parameter type." ); |
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[b0440b7] | 190 | |
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| 191 | |
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[d335627] | 192 | unsigned int i = 0; |
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[b1ccdfd] | 193 | const unsigned int end = ftype->parameters.size(); |
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| 194 | for ( auto p : unsafe_group_iterate( appExpr->args, ftype->parameters ) ) { |
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[d335627] | 195 | if (i == end) break; |
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| 196 | Expression *& arg = std::get<0>( p ); |
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| 197 | Type * formal = std::get<1>( p )->get_type(); |
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| 198 | PRINT( |
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| 199 | std::cerr << "pair<0>: " << arg << std::endl; |
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[a9b1b0c] | 200 | std::cerr << " -- " << arg->result << std::endl; |
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[d335627] | 201 | std::cerr << "pair<1>: " << formal << std::endl; |
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| 202 | ) |
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| 203 | if ( dynamic_cast<ReferenceType*>( formal ) ) { |
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[a9b1b0c] | 204 | PRINT( |
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| 205 | std::cerr << "===formal is reference" << std::endl; |
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| 206 | ) |
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| 207 | // TODO: it's likely that the second condition should be ... && ! isIntrinsicReference( arg ), but this requires investigation. |
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| 208 | if ( function->get_linkage() != LinkageSpec::Intrinsic && isIntrinsicReference( arg ) ) { |
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| 209 | // if argument is dereference or array subscript, the result isn't REALLY a reference, but non-intrinsic functions expect a reference: take address |
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| 210 | PRINT( |
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| 211 | std::cerr << "===is intrinsic arg in non-intrinsic call - adding address" << std::endl; |
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| 212 | ) |
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| 213 | arg = new AddressExpr( arg ); |
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| 214 | } else if ( function->get_linkage() == LinkageSpec::Intrinsic && arg->result->referenceDepth() != 0 ) { |
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| 215 | // argument is a 'real' reference, but function expects a C lvalue: add a dereference to the reference-typed argument |
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| 216 | PRINT( |
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| 217 | std::cerr << "===is non-intrinsic arg in intrinsic call - adding deref to arg" << std::endl; |
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| 218 | ) |
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[b1ccdfd] | 219 | Type * baseType = InitTweak::getPointerBase( arg->result ); |
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| 220 | assertf( baseType, "parameter is reference, arg must be pointer or reference: %s", toString( arg->result ).c_str() ); |
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[d335627] | 221 | PointerType * ptrType = new PointerType( Type::Qualifiers(), baseType->clone() ); |
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[b1ccdfd] | 222 | delete arg->result; |
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[d335627] | 223 | arg->set_result( ptrType ); |
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| 224 | arg = mkDeref( arg ); |
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[a9b1b0c] | 225 | assertf( arg->result->referenceDepth() == 0, "Reference types should have been eliminated from intrinsic function calls, but weren't: %s", toCString( arg->result ) ); |
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[1d776fd] | 226 | } |
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| 227 | } |
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[d335627] | 228 | ++i; |
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[baba5d8] | 229 | } |
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[1d776fd] | 230 | } |
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| 231 | return appExpr; |
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[01aeade] | 232 | } |
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| 233 | |
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[8499c707] | 234 | // idea: &&&E: get outer &, inner & |
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| 235 | // at inner &, record depth D of reference type |
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| 236 | // at outer &, add D derefs. |
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[8135d4c] | 237 | void AddrRef::premutate( Expression * ) { |
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[8499c707] | 238 | GuardValue( current ); |
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| 239 | GuardValue( first ); |
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| 240 | current = false; |
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| 241 | first = true; |
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| 242 | } |
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| 243 | |
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[8135d4c] | 244 | void AddrRef::premutate( AddressExpr * ) { |
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[8499c707] | 245 | GuardValue( current ); |
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| 246 | GuardValue( first ); |
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| 247 | current = first; |
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| 248 | first = false; |
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| 249 | if ( current ) { |
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| 250 | GuardValue( refDepth ); |
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| 251 | refDepth = 0; |
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| 252 | } |
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| 253 | } |
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| 254 | |
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| 255 | Expression * AddrRef::postmutate( AddressExpr * addrExpr ) { |
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| 256 | if ( refDepth == 0 ) { |
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[b1ccdfd] | 257 | if ( ! isIntrinsicReference( addrExpr->arg ) ) { |
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[8499c707] | 258 | // try to avoid ?[?] |
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[b1ccdfd] | 259 | refDepth = addrExpr->arg->result->referenceDepth(); |
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[8499c707] | 260 | } |
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| 261 | } |
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| 262 | if ( current ) { |
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| 263 | Expression * ret = addrExpr; |
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| 264 | while ( refDepth ) { |
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| 265 | ret = mkDeref( ret ); |
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| 266 | refDepth--; |
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| 267 | } |
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| 268 | return ret; |
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| 269 | } |
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| 270 | return addrExpr; |
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| 271 | } |
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| 272 | |
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[8a6cf7e] | 273 | Expression * ReferenceConversions::postmutate( AddressExpr * addrExpr ) { |
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| 274 | // Inner expression may have been lvalue to reference conversion, which becomes an address expression. |
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| 275 | // In this case, remove the outer address expression and return the argument. |
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| 276 | // TODO: It's possible that this might catch too much and require a more sophisticated check. |
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| 277 | return addrExpr; |
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| 278 | } |
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| 279 | |
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[1d776fd] | 280 | Expression * ReferenceConversions::postmutate( CastExpr * castExpr ) { |
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[9a34b5a] | 281 | // xxx - is it possible to convert directly between reference types with a different base? E.g., |
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| 282 | // int x; |
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| 283 | // (double&)x; |
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| 284 | // At the moment, I am working off of the assumption that this is illegal, thus the cast becomes redundant |
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| 285 | // after this pass, so trash the cast altogether. If that changes, care must be taken to insert the correct |
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| 286 | // pointer casts in the right places. |
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| 287 | |
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[a4d188f] | 288 | // Note: reference depth difference is the determining factor in what code is run, rather than whether something is |
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| 289 | // reference type or not, since conversion still needs to occur when both types are references that differ in depth. |
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[31cb252] | 290 | |
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| 291 | Type * destType = castExpr->result; |
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| 292 | Type * srcType = castExpr->arg->result; |
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| 293 | int depth1 = destType->referenceDepth(); |
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| 294 | int depth2 = srcType->referenceDepth(); |
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| 295 | int diff = depth1 - depth2; |
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| 296 | |
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| 297 | if ( diff > 0 && ! srcType->get_lvalue() ) { |
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| 298 | // rvalue to reference conversion -- introduce temporary |
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| 299 | // know that reference depth of cast argument is 0, need to introduce n temporaries for reference depth of n, e.g. |
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| 300 | // (int &&&)3; |
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| 301 | // becomes |
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| 302 | // int __ref_tmp_0 = 3; |
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| 303 | // int & __ref_tmp_1 = _&_ref_tmp_0; |
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| 304 | // int && __ref_tmp_2 = &__ref_tmp_1; |
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| 305 | // &__ref_tmp_2; |
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[453b586] | 306 | // the last & comes from the remaining reference conversion code |
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[2348881] | 307 | SemanticWarning( castExpr->arg->location, Warning::RvalueToReferenceConversion, toCString( castExpr->arg ) ); |
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[31cb252] | 308 | |
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| 309 | static UniqueName tempNamer( "__ref_tmp_" ); |
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| 310 | ObjectDecl * temp = ObjectDecl::newObject( tempNamer.newName(), castExpr->arg->result->clone(), new SingleInit( castExpr->arg ) ); |
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| 311 | PRINT( std::cerr << "made temp: " << temp << std::endl; ) |
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| 312 | stmtsToAddBefore.push_back( new DeclStmt( temp ) ); |
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[a4d188f] | 313 | for ( int i = 0; i < depth1-1; i++ ) { // xxx - maybe this should be diff-1? check how this works with reference type for srcType |
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[31cb252] | 314 | ObjectDecl * newTemp = ObjectDecl::newObject( tempNamer.newName(), new ReferenceType( Type::Qualifiers(), temp->type->clone() ), new SingleInit( new AddressExpr( new VariableExpr( temp ) ) ) ); |
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| 315 | PRINT( std::cerr << "made temp" << i << ": " << newTemp << std::endl; ) |
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| 316 | stmtsToAddBefore.push_back( new DeclStmt( newTemp ) ); |
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| 317 | temp = newTemp; |
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| 318 | } |
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| 319 | // update diff so that remaining code works out correctly |
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| 320 | castExpr->arg = new VariableExpr( temp ); |
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| 321 | PRINT( std::cerr << "update cast to: " << castExpr << std::endl; ) |
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| 322 | srcType = castExpr->arg->result; |
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| 323 | depth2 = srcType->referenceDepth(); |
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| 324 | diff = depth1 - depth2; |
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| 325 | assert( diff == 1 ); |
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| 326 | } |
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[fc56cdbf] | 327 | |
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[a4d188f] | 328 | // handle conversion between different depths |
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[31cb252] | 329 | PRINT ( |
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| 330 | if ( depth1 || depth2 ) { |
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| 331 | std::cerr << "destType: " << destType << " / srcType: " << srcType << std::endl; |
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| 332 | std::cerr << "depth: " << depth1 << " / " << depth2 << std::endl; |
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| 333 | } |
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| 334 | ) |
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| 335 | if ( diff > 0 ) { |
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| 336 | // conversion to type with more depth (e.g. int & -> int &&): add address-of for each level of difference |
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| 337 | Expression * ret = castExpr->arg; |
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| 338 | for ( int i = 0; i < diff; ++i ) { |
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| 339 | ret = new AddressExpr( ret ); |
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| 340 | } |
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| 341 | if ( srcType->get_lvalue() && srcType->get_qualifiers() != strict_dynamic_cast<ReferenceType *>( destType )->base->get_qualifiers() ) { |
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| 342 | // must keep cast if cast-to type is different from the actual type |
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| 343 | castExpr->arg = ret; |
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[1d776fd] | 344 | return castExpr; |
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| 345 | } |
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[31cb252] | 346 | ret->env = castExpr->env; |
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| 347 | delete ret->result; |
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| 348 | ret->result = castExpr->result; |
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| 349 | castExpr->env = nullptr; |
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| 350 | castExpr->arg = nullptr; |
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| 351 | castExpr->result = nullptr; |
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| 352 | delete castExpr; |
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| 353 | return ret; |
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| 354 | } else if ( diff < 0 ) { |
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| 355 | // conversion to type with less depth (e.g. int && -> int &): add dereferences for each level of difference |
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| 356 | diff = -diff; // care only about magnitude now |
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[0690350] | 357 | Expression * ret = castExpr->arg; |
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[31cb252] | 358 | for ( int i = 0; i < diff; ++i ) { |
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[9191a8e] | 359 | ret = mkDeref( ret ); |
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| 360 | } |
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[31cb252] | 361 | if ( ! ResolvExpr::typesCompatibleIgnoreQualifiers( destType->stripReferences(), srcType->stripReferences(), SymTab::Indexer() ) ) { |
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[8a6cf7e] | 362 | // must keep cast if types are different |
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[0690350] | 363 | castExpr->arg = ret; |
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[31cb252] | 364 | return castExpr; |
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[8a6cf7e] | 365 | } |
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[31cb252] | 366 | ret->env = castExpr->env; |
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| 367 | delete ret->result; |
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| 368 | ret->result = castExpr->result; |
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| 369 | ret->result->set_lvalue( true ); // ensure result is lvalue |
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| 370 | castExpr->env = nullptr; |
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| 371 | castExpr->arg = nullptr; |
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| 372 | castExpr->result = nullptr; |
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| 373 | delete castExpr; |
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[9191a8e] | 374 | return ret; |
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[31cb252] | 375 | } else { |
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| 376 | assert( diff == 0 ); |
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| 377 | // conversion between references of the same depth |
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| 378 | return castExpr; |
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[1d776fd] | 379 | } |
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[01aeade] | 380 | } |
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[b6fd751] | 381 | |
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[1d776fd] | 382 | Type * ReferenceTypeElimination::postmutate( ReferenceType * refType ) { |
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[b1ccdfd] | 383 | Type * base = refType->base; |
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[8a6cf7e] | 384 | Type::Qualifiers qualifiers = refType->get_qualifiers(); |
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[b1ccdfd] | 385 | refType->base = nullptr; |
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[1d776fd] | 386 | delete refType; |
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[8a6cf7e] | 387 | return new PointerType( qualifiers, base ); |
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[ce8c12f] | 388 | } |
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| 389 | |
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[acd7c5dd] | 390 | template<typename Func> |
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| 391 | Expression * GeneralizedLvalue::applyTransformation( Expression * expr, Expression * arg, Func mkExpr ) { |
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| 392 | if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( arg ) ) { |
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[b1ccdfd] | 393 | Expression * arg1 = commaExpr->arg1->clone(); |
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| 394 | Expression * arg2 = commaExpr->arg2->clone(); |
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[9236060] | 395 | Expression * ret = new CommaExpr( arg1, mkExpr( arg2 )->acceptMutator( *visitor ) ); |
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[b1ccdfd] | 396 | ret->env = expr->env; |
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| 397 | expr->env = nullptr; |
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[acd7c5dd] | 398 | delete expr; |
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[8499c707] | 399 | return ret; |
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[acd7c5dd] | 400 | } else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( arg ) ) { |
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[b1ccdfd] | 401 | Expression * arg1 = condExpr->arg1->clone(); |
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| 402 | Expression * arg2 = condExpr->arg2->clone(); |
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| 403 | Expression * arg3 = condExpr->arg3->clone(); |
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[9236060] | 404 | ConditionalExpr * ret = new ConditionalExpr( arg1, mkExpr( arg2 )->acceptMutator( *visitor ), mkExpr( arg3 )->acceptMutator( *visitor ) ); |
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[b1ccdfd] | 405 | ret->env = expr->env; |
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| 406 | expr->env = nullptr; |
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[acd7c5dd] | 407 | delete expr; |
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| 408 | |
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| 409 | // conditional expr type may not be either of the argument types, need to unify |
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| 410 | using namespace ResolvExpr; |
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| 411 | Type* commonType = nullptr; |
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| 412 | TypeEnvironment newEnv; |
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| 413 | AssertionSet needAssertions, haveAssertions; |
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| 414 | OpenVarSet openVars; |
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[b1ccdfd] | 415 | unify( ret->arg2->result, ret->arg3->result, newEnv, needAssertions, haveAssertions, openVars, SymTab::Indexer(), commonType ); |
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| 416 | ret->result = commonType ? commonType : ret->arg2->result->clone(); |
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[8499c707] | 417 | return ret; |
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[b6fd751] | 418 | } |
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[acd7c5dd] | 419 | return expr; |
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| 420 | } |
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| 421 | |
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[9236060] | 422 | Expression * GeneralizedLvalue::postmutate( MemberExpr * memExpr ) { |
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[b1ccdfd] | 423 | return applyTransformation( memExpr, memExpr->aggregate, [=]( Expression * aggr ) { return new MemberExpr( memExpr->member, aggr ); } ); |
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[acd7c5dd] | 424 | } |
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| 425 | |
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[9236060] | 426 | Expression * GeneralizedLvalue::postmutate( AddressExpr * addrExpr ) { |
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[b1ccdfd] | 427 | return applyTransformation( addrExpr, addrExpr->arg, []( Expression * arg ) { return new AddressExpr( arg ); } ); |
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[b6fd751] | 428 | } |
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[cb43451] | 429 | |
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[8499c707] | 430 | Expression * CollapseAddrDeref::postmutate( AddressExpr * addrExpr ) { |
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[b1ccdfd] | 431 | Expression * arg = addrExpr->arg; |
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[cb43451] | 432 | if ( isIntrinsicReference( arg ) ) { |
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| 433 | std::string fname = InitTweak::getFunctionName( arg ); |
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| 434 | if ( fname == "*?" ) { |
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| 435 | Expression *& arg0 = InitTweak::getCallArg( arg, 0 ); |
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| 436 | Expression * ret = arg0; |
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[b1ccdfd] | 437 | ret->set_env( addrExpr->env ); |
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[cb43451] | 438 | arg0 = nullptr; |
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[b1ccdfd] | 439 | addrExpr->env = nullptr; |
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[8499c707] | 440 | delete addrExpr; |
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[cb43451] | 441 | return ret; |
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| 442 | } |
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[bf7b6015] | 443 | } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( arg ) ) { |
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| 444 | // need to move cast to pointer type out a level since address of pointer |
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| 445 | // is not valid C code (can be introduced in prior passes, e.g., InstantiateGeneric) |
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| 446 | if ( InitTweak::getPointerBase( castExpr->result ) ) { |
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| 447 | addrExpr->arg = castExpr->arg; |
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| 448 | castExpr->arg = addrExpr; |
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| 449 | castExpr->result = new PointerType( Type::Qualifiers(), castExpr->result ); |
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| 450 | return castExpr; |
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| 451 | } |
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[cb43451] | 452 | } |
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[8499c707] | 453 | return addrExpr; |
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[cb43451] | 454 | } |
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| 455 | |
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| 456 | Expression * CollapseAddrDeref::postmutate( ApplicationExpr * appExpr ) { |
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| 457 | if ( isIntrinsicReference( appExpr ) ) { |
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| 458 | std::string fname = InitTweak::getFunctionName( appExpr ); |
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| 459 | if ( fname == "*?" ) { |
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| 460 | Expression * arg = InitTweak::getCallArg( appExpr, 0 ); |
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| 461 | // xxx - this isn't right, because it can remove casts that should be there... |
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| 462 | // while ( CastExpr * castExpr = dynamic_cast< CastExpr * >( arg ) ) { |
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| 463 | // arg = castExpr->get_arg(); |
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| 464 | // } |
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| 465 | if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( arg ) ) { |
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[b1ccdfd] | 466 | Expression * ret = addrExpr->arg; |
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| 467 | ret->env = appExpr->env; |
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| 468 | addrExpr->arg = nullptr; |
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| 469 | appExpr->env = nullptr; |
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[cb43451] | 470 | delete appExpr; |
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| 471 | return ret; |
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| 472 | } |
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| 473 | } |
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| 474 | } |
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| 475 | return appExpr; |
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| 476 | } |
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[01aeade] | 477 | } // namespace |
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[51b7345] | 478 | } // namespace GenPoly |
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[01aeade] | 479 | |
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[51587aa] | 480 | // Local Variables: // |
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| 481 | // tab-width: 4 // |
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| 482 | // mode: c++ // |
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| 483 | // compile-command: "make install" // |
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| 484 | // End: // |
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