[1931bb01] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2018 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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[11df881] | 7 | // FixReturnTypes.cpp -- Unifies the representation of return types. |
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[1931bb01] | 8 | // |
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| 9 | // Author : Andrew Beach |
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| 10 | // Created On : Tue Jun 29 11:06:00 2022 |
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| 11 | // Last Modified By : Andrew Beach |
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| 12 | // Last Modified On : Tue Jul 12 14:04:00 2022 |
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| 13 | // Update Count : 0 |
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| 14 | // |
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| 15 | |
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| 16 | #include "FixReturnTypes.hpp" |
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| 17 | |
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| 18 | #include "AST/Decl.hpp" |
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| 19 | #include "AST/Pass.hpp" |
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| 20 | #include "AST/Type.hpp" |
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[83fd57d] | 21 | #include "CodeGen/CodeGenerator.hpp" |
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[7b5694d] | 22 | #include "ResolvExpr/Unify.h" |
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[1931bb01] | 23 | |
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| 24 | namespace Validate { |
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| 25 | |
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| 26 | namespace { |
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| 27 | |
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| 28 | struct ReturnTypeFixer final { |
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| 29 | ast::FunctionDecl const * postvisit( ast::FunctionDecl const * decl ); |
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| 30 | ast::FunctionType const * postvisit( ast::FunctionType const * type ); |
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| 31 | }; |
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| 32 | |
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| 33 | ast::FunctionDecl const * ReturnTypeFixer::postvisit( |
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| 34 | ast::FunctionDecl const * decl ) { |
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| 35 | // TODO: It does not handle return values. This information needs to be |
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| 36 | // saved if resolution is to use it. (But does it currently?) |
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| 37 | if ( 1 < decl->returns.size() ) { |
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| 38 | auto mut = ast::mutate( decl ); |
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| 39 | // Generate a single return value which is the tuple of all return values. |
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| 40 | auto resultType = ResolvExpr::extractResultType( mut->type ); |
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| 41 | ast::TupleType const * tupleType = resultType.strict_as<ast::TupleType>(); |
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| 42 | // Ensure return values are not destructed by explicitly creating |
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| 43 | // an empty ListInit node wherein the ConstructFlag is NoConstruct. |
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| 44 | ast::ObjectDecl * newRet = new ast::ObjectDecl( |
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| 45 | decl->location, "", tupleType, |
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| 46 | new ast::ListInit( decl->location, {}, {}, ast::NoConstruct ), |
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| 47 | ast::Storage::Classes(), ast::Linkage::Cforall ); |
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| 48 | mut->returns.clear(); |
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| 49 | mut->returns.push_back( newRet ); |
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| 50 | decl = mut; |
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| 51 | } |
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| 52 | |
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| 53 | assertf( decl->returns.size() < 2, |
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| 54 | "Function %s has too many return values: %zu", |
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| 55 | decl->name.c_str(), decl->returns.size() ); |
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| 56 | if ( 0 == decl->returns.size() ) { |
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| 57 | return decl; |
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| 58 | } |
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| 59 | // Ensure that all function return values have a name. |
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| 60 | // The function name is used to disambiguate the name (and provide |
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| 61 | // debugging information) from other return values. |
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| 62 | auto mut = ast::mutate( decl ); |
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| 63 | ast::ptr<ast::DeclWithType> & ret = mut->returns.front(); |
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| 64 | if ( "" == ret->name ) { |
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| 65 | ret.get_and_mutate()->name = "_retval_" + CodeGen::genName( decl ); |
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| 66 | } |
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| 67 | ret.get_and_mutate()->attributes.push_back( new ast::Attribute( "unused" ) ); |
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| 68 | return mut; |
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| 69 | } |
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| 70 | |
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| 71 | ast::FunctionType const * ReturnTypeFixer::postvisit( |
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| 72 | ast::FunctionType const * type ) { |
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| 73 | if ( 1 < type->returns.size() ) { |
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| 74 | auto mut = ast::mutate( type ); |
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| 75 | // Generate a single return type which is the tuple of all return types. |
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| 76 | auto resultType = ResolvExpr::extractResultType( mut ); |
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| 77 | ast::TupleType const * tupleType = resultType.strict_as<ast::TupleType>(); |
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| 78 | mut->returns.clear(); |
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| 79 | mut->returns.push_back( tupleType ); |
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| 80 | return mut; |
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| 81 | } |
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| 82 | return type; |
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| 83 | } |
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| 84 | |
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| 85 | } // namespace |
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| 86 | |
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| 87 | void fixReturnTypes( ast::TranslationUnit & translationUnit ) { |
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| 88 | ast::Pass<ReturnTypeFixer>::run( translationUnit ); |
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| 89 | } |
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| 90 | |
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| 91 | } // namespace Validate |
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| 92 | |
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| 93 | // Local Variables: // |
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| 94 | // tab-width: 4 // |
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| 95 | // mode: c++ // |
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| 96 | // compile-command: "make install" // |
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| 97 | // End: // |
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