[5ee153d] | 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 | // ExceptTranslateNew.cpp -- Conversion of exception control flow structures. |
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| 8 | // |
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| 9 | // Author : Andrew Beach |
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| 10 | // Created On : Mon Nov 8 11:53:00 2021 |
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[0fba0d4] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Mon Jan 31 18:49:58 2022 |
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| 13 | // Update Count : 1 |
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[5ee153d] | 14 | // |
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| 15 | |
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| 16 | #include "ExceptTranslate.h" |
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| 17 | |
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| 18 | #include "AST/Expr.hpp" |
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| 19 | #include "AST/Pass.hpp" |
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| 20 | #include "AST/Stmt.hpp" |
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| 21 | #include "AST/TranslationUnit.hpp" |
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| 22 | |
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| 23 | namespace ControlStruct { |
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| 24 | |
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| 25 | class TranslateThrowsCore : public ast::WithGuards { |
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| 26 | const ast::ObjectDecl * terminateHandlerExcept; |
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| 27 | enum Context { NoHandler, TerHandler, ResHandler } currentContext; |
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| 28 | |
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| 29 | const ast::Stmt * createEitherThrow( |
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| 30 | const ast::ThrowStmt * throwStmt, const char * funcName ); |
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| 31 | const ast::Stmt * createTerminateRethrow( const ast::ThrowStmt * ); |
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| 32 | |
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| 33 | public: |
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| 34 | TranslateThrowsCore() : |
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| 35 | terminateHandlerExcept( nullptr ), currentContext( NoHandler ) |
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| 36 | {} |
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| 37 | |
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| 38 | void previsit( const ast::CatchStmt * stmt ); |
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| 39 | const ast::Stmt * postvisit( const ast::ThrowStmt * stmt ); |
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| 40 | }; |
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| 41 | |
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| 42 | const ast::Stmt * TranslateThrowsCore::createEitherThrow( |
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| 43 | const ast::ThrowStmt * throwStmt, const char * funcName ) { |
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| 44 | // `throwFunc`( `throwStmt->name` ); |
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| 45 | ast::UntypedExpr * call = new ast::UntypedExpr( throwStmt->location, |
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| 46 | new ast::NameExpr( throwStmt->location, funcName ) |
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| 47 | ); |
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| 48 | call->args.push_back( throwStmt->expr ); |
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| 49 | return new ast::ExprStmt( throwStmt->location, call ); |
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| 50 | } |
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| 51 | |
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| 52 | ast::VariableExpr * varOf( const ast::DeclWithType * decl ) { |
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| 53 | return new ast::VariableExpr( decl->location, decl ); |
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| 54 | } |
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| 55 | |
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| 56 | const ast::Stmt * TranslateThrowsCore::createTerminateRethrow( |
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| 57 | const ast::ThrowStmt * stmt ) { |
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| 58 | // { `terminate_handler_except` = 0p; __rethrow_terminate(); } |
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| 59 | assert( nullptr == stmt->expr ); |
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| 60 | assert( terminateHandlerExcept ); |
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| 61 | |
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| 62 | ast::CompoundStmt * result = new ast::CompoundStmt( |
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| 63 | stmt->location, {}, std::vector<ast::Label>( stmt->labels ) ); |
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| 64 | result->push_back( new ast::ExprStmt( stmt->location, |
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| 65 | ast::UntypedExpr::createAssign( |
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| 66 | stmt->location, |
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| 67 | varOf( terminateHandlerExcept ), |
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| 68 | ast::ConstantExpr::null( |
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| 69 | stmt->location, |
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| 70 | terminateHandlerExcept->type |
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| 71 | ) |
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| 72 | ) |
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| 73 | ) ); |
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| 74 | result->push_back( new ast::ExprStmt( stmt->location, new ast::UntypedExpr( |
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| 75 | stmt->location, |
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| 76 | new ast::NameExpr( stmt->location, "__cfaehm_rethrow_terminate" ) |
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| 77 | ) ) ); |
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| 78 | return result; |
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| 79 | } |
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| 80 | |
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| 81 | void TranslateThrowsCore::previsit( const ast::CatchStmt * stmt ) { |
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| 82 | // Validate the statement's form. |
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| 83 | const ast::ObjectDecl * decl = stmt->decl.as<ast::ObjectDecl>(); |
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| 84 | // Also checking the type would be nice. |
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| 85 | if ( !decl || !decl->type.as<ast::PointerType>() ) { |
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| 86 | std::string kind = (ast::Terminate == stmt->kind) ? "catch" : "catchResume"; |
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| 87 | SemanticError( stmt->location, kind + " must have pointer to an exception type" ); |
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| 88 | } |
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| 89 | |
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| 90 | // Track the handler context. |
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| 91 | if ( ast::Terminate == stmt->kind ) { |
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| 92 | GuardValue( currentContext ) = TerHandler; |
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| 93 | GuardValue( terminateHandlerExcept ) = decl; |
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| 94 | } else { |
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| 95 | GuardValue( currentContext ) = ResHandler; |
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| 96 | } |
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| 97 | } |
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| 98 | |
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| 99 | const ast::Stmt * TranslateThrowsCore::postvisit( |
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| 100 | const ast::ThrowStmt * stmt ) { |
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| 101 | // Ignoring ThrowStmt::target for now. |
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| 102 | // Handle Termination (Raise, Reraise, Error): |
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| 103 | if ( ast::Terminate == stmt->kind ) { |
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| 104 | if ( stmt->expr ) { |
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| 105 | return createEitherThrow( stmt, "$throw" ); |
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| 106 | } else if ( TerHandler == currentContext ) { |
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| 107 | return createTerminateRethrow( stmt ); |
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| 108 | } else { |
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| 109 | abort( "Invalid throw in %s at %i\n", |
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| 110 | stmt->location.filename.c_str(), |
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| 111 | stmt->location.first_line); |
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| 112 | } |
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| 113 | // Handle Resumption (Raise, Reraise, Error): |
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| 114 | } else { |
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| 115 | if ( stmt->expr ) { |
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| 116 | return createEitherThrow( stmt, "$throwResume" ); |
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| 117 | } else if ( ResHandler == currentContext ) { |
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| 118 | // This has to be handled later. |
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| 119 | return stmt; |
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| 120 | } else { |
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| 121 | abort( "Invalid throwResume in %s at %i\n", |
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| 122 | stmt->location.filename.c_str(), |
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| 123 | stmt->location.first_line); |
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| 124 | } |
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| 125 | } |
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| 126 | } |
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| 127 | |
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| 128 | void translateThrows( ast::TranslationUnit & transUnit ) { |
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| 129 | ast::Pass<TranslateThrowsCore>::run( transUnit ); |
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| 130 | } |
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| 131 | |
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| 132 | } // namespace ControlStruct |
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| 133 | |
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| 134 | // Local Variables: // |
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| 135 | // tab-width: 4 // |
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| 136 | // mode: c++ // |
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| 137 | // compile-command: "make install" // |
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| 138 | // End: // |
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