[ba912706] | 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 | // ExceptVisitor.cc -- |
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| 8 | // |
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| 9 | // Author : Andrew Beach |
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| 10 | // Created On : Wed Jun 14 16:49:00 2017 |
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[3090127] | 11 | // Last Modified By : Andrew Beach |
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[66ba544] | 12 | // Last Modified On : Thr May 21 13:18:00 2020 |
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| 13 | // Update Count : 15 |
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[ba912706] | 14 | // |
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| 15 | |
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| 16 | #include "ExceptTranslate.h" |
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[d180746] | 17 | |
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| 18 | #include <stddef.h> // for NULL |
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| 19 | #include <cassert> // for assert, assertf |
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| 20 | #include <iterator> // for back_inserter, inserter |
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| 21 | #include <string> // for string, operator== |
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| 22 | |
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| 23 | #include "Common/PassVisitor.h" // for PassVisitor, WithGuards |
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| 24 | #include "Common/SemanticError.h" // for SemanticError |
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| 25 | #include "Common/utility.h" // for CodeLocation |
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[07de76b] | 26 | #include "SynTree/LinkageSpec.h" // for Cforall |
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[d180746] | 27 | #include "SynTree/Attribute.h" // for Attribute |
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| 28 | #include "SynTree/Constant.h" // for Constant |
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| 29 | #include "SynTree/Declaration.h" // for ObjectDecl, FunctionDecl, Struc... |
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| 30 | #include "SynTree/Expression.h" // for UntypedExpr, ConstantExpr, Name... |
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| 31 | #include "SynTree/Initializer.h" // for SingleInit, ListInit |
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[ba3706f] | 32 | #include "SynTree/Label.h" // for Label |
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[d180746] | 33 | #include "SynTree/Mutator.h" // for mutateAll |
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| 34 | #include "SynTree/Statement.h" // for CompoundStmt, CatchStmt, ThrowStmt |
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| 35 | #include "SynTree/Type.h" // for FunctionType, Type, noQualifiers |
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[7862059] | 36 | #include "SynTree/DeclReplacer.h" // for DeclReplacer |
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[d180746] | 37 | #include "SynTree/Visitor.h" // for acceptAll |
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[ba912706] | 38 | |
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[307a732] | 39 | namespace ControlStruct { |
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[ba912706] | 40 | |
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[948b0c8] | 41 | // Buricratic Helpers (Not having to do with the paritular operation.) |
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| 42 | |
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| 43 | typedef std::list<CatchStmt*> CatchList; |
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| 44 | |
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| 45 | void split( CatchList& allHandlers, CatchList& terHandlers, |
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| 46 | CatchList& resHandlers ) { |
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| 47 | while ( !allHandlers.empty() ) { |
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| 48 | CatchStmt * stmt = allHandlers.front(); |
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| 49 | allHandlers.pop_front(); |
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| 50 | if (CatchStmt::Terminate == stmt->get_kind()) { |
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| 51 | terHandlers.push_back(stmt); |
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| 52 | } else { |
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| 53 | resHandlers.push_back(stmt); |
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| 54 | } |
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| 55 | } |
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| 56 | } |
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| 57 | |
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| 58 | void appendDeclStmt( CompoundStmt * block, Declaration * item ) { |
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[ba3706f] | 59 | block->push_back(new DeclStmt(item)); |
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[948b0c8] | 60 | } |
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| 61 | |
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| 62 | Expression * nameOf( DeclarationWithType * decl ) { |
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| 63 | return new VariableExpr( decl ); |
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| 64 | } |
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| 65 | |
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[046a890] | 66 | class ThrowMutatorCore : public WithGuards { |
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| 67 | ObjectDecl * terminate_handler_except; |
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| 68 | enum Context { NoHandler, TerHandler, ResHandler } cur_context; |
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| 69 | |
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| 70 | // The helper functions for code/syntree generation. |
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| 71 | Statement * create_either_throw( |
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| 72 | ThrowStmt * throwStmt, const char * throwFunc ); |
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| 73 | Statement * create_terminate_rethrow( ThrowStmt * throwStmt ); |
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| 74 | Statement * create_resume_rethrow( ThrowStmt * throwStmt ); |
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| 75 | |
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| 76 | public: |
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| 77 | ThrowMutatorCore() : |
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| 78 | terminate_handler_except( nullptr ), |
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| 79 | cur_context( NoHandler ) |
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| 80 | {} |
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| 81 | |
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| 82 | void premutate( CatchStmt *catchStmt ); |
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| 83 | Statement * postmutate( ThrowStmt *throwStmt ); |
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| 84 | }; |
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| 85 | |
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| 86 | // ThrowStmt Mutation Helpers |
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| 87 | |
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| 88 | Statement * ThrowMutatorCore::create_either_throw( |
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| 89 | ThrowStmt * throwStmt, const char * throwFunc ) { |
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| 90 | // `throwFunc`( `throwStmt->get_name()` ); |
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| 91 | UntypedExpr * call = new UntypedExpr( new NameExpr( throwFunc ) ); |
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| 92 | call->get_args().push_back( throwStmt->get_expr() ); |
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| 93 | throwStmt->set_expr( nullptr ); |
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| 94 | delete throwStmt; |
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| 95 | return new ExprStmt( call ); |
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| 96 | } |
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| 97 | |
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| 98 | Statement * ThrowMutatorCore::create_terminate_rethrow( |
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| 99 | ThrowStmt *throwStmt ) { |
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| 100 | // { `terminate_handler_except` = 0p; __rethrow_terminate(); } |
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| 101 | assert( nullptr == throwStmt->get_expr() ); |
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| 102 | assert( terminate_handler_except ); |
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| 103 | |
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| 104 | CompoundStmt * result = new CompoundStmt(); |
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| 105 | result->labels = throwStmt->labels; |
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| 106 | result->push_back( new ExprStmt( UntypedExpr::createAssign( |
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| 107 | nameOf( terminate_handler_except ), |
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| 108 | new ConstantExpr( Constant::null( |
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| 109 | //new PointerType( |
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| 110 | // noQualifiers, |
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| 111 | terminate_handler_except->get_type()->clone() |
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| 112 | // ) |
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| 113 | ) ) |
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| 114 | ) ) ); |
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| 115 | result->push_back( new ExprStmt( |
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| 116 | new UntypedExpr( new NameExpr( "__cfaehm_rethrow_terminate" ) ) |
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| 117 | ) ); |
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| 118 | delete throwStmt; |
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| 119 | return result; |
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| 120 | } |
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| 121 | |
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| 122 | Statement * ThrowMutatorCore::create_resume_rethrow( |
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| 123 | ThrowStmt *throwStmt ) { |
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| 124 | // return false; |
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| 125 | Statement * result = new ReturnStmt( |
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| 126 | new ConstantExpr( Constant::from_bool( false ) ) |
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| 127 | ); |
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| 128 | result->labels = throwStmt->labels; |
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| 129 | delete throwStmt; |
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| 130 | return result; |
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| 131 | } |
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| 132 | |
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| 133 | // Visiting/Mutating Functions |
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| 134 | |
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| 135 | void ThrowMutatorCore::premutate( CatchStmt *catchStmt ) { |
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| 136 | // Validate the statement's form. |
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| 137 | ObjectDecl * decl = dynamic_cast<ObjectDecl *>( catchStmt->get_decl() ); |
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| 138 | // Also checking the type would be nice. |
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| 139 | if ( decl ) { |
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| 140 | // Pass. |
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| 141 | } else if ( CatchStmt::Terminate == catchStmt->get_kind() ) { |
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| 142 | SemanticError(catchStmt->location, "catch must have exception type"); |
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| 143 | } else { |
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| 144 | SemanticError(catchStmt->location, "catchResume must have exception type"); |
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| 145 | } |
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| 146 | |
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| 147 | // Track the handler context. |
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| 148 | GuardValue( cur_context ); |
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| 149 | if ( CatchStmt::Terminate == catchStmt->get_kind() ) { |
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| 150 | cur_context = TerHandler; |
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| 151 | |
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| 152 | GuardValue( terminate_handler_except ); |
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| 153 | terminate_handler_except = decl; |
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| 154 | } else { |
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| 155 | cur_context = ResHandler; |
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| 156 | } |
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| 157 | } |
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| 158 | |
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| 159 | Statement * ThrowMutatorCore::postmutate( ThrowStmt *throwStmt ) { |
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| 160 | // Ignoring throwStmt->get_target() for now. |
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| 161 | if ( ThrowStmt::Terminate == throwStmt->get_kind() ) { |
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| 162 | if ( throwStmt->get_expr() ) { |
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| 163 | return create_either_throw( throwStmt, "$throw" ); |
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| 164 | } else if ( TerHandler == cur_context ) { |
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| 165 | return create_terminate_rethrow( throwStmt ); |
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| 166 | } else { |
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| 167 | abort("Invalid throw in %s at %i\n", |
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| 168 | throwStmt->location.filename.c_str(), |
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| 169 | throwStmt->location.first_line); |
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| 170 | } |
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| 171 | } else { |
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| 172 | if ( throwStmt->get_expr() ) { |
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| 173 | return create_either_throw( throwStmt, "$throwResume" ); |
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| 174 | } else if ( ResHandler == cur_context ) { |
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| 175 | return create_resume_rethrow( throwStmt ); |
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| 176 | } else { |
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| 177 | abort("Invalid throwResume in %s at %i\n", |
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| 178 | throwStmt->location.filename.c_str(), |
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| 179 | throwStmt->location.first_line); |
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| 180 | } |
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| 181 | } |
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| 182 | } |
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| 183 | |
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[66ba544] | 184 | class TryMutatorCore { |
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[948b0c8] | 185 | // The built in types used in translation. |
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| 186 | StructDecl * except_decl; |
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| 187 | StructDecl * node_decl; |
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| 188 | StructDecl * hook_decl; |
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| 189 | |
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| 190 | // The many helper functions for code/syntree generation. |
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| 191 | CompoundStmt * take_try_block( TryStmt * tryStmt ); |
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| 192 | FunctionDecl * create_try_wrapper( CompoundStmt * body ); |
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| 193 | FunctionDecl * create_terminate_catch( CatchList &handlers ); |
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| 194 | CompoundStmt * create_single_matcher( |
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| 195 | DeclarationWithType * except_obj, CatchStmt * modded_handler ); |
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| 196 | FunctionDecl * create_terminate_match( CatchList &handlers ); |
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| 197 | CompoundStmt * create_terminate_caller( FunctionDecl * try_wrapper, |
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| 198 | FunctionDecl * terminate_catch, FunctionDecl * terminate_match ); |
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| 199 | FunctionDecl * create_resume_handler( CatchList &handlers ); |
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| 200 | CompoundStmt * create_resume_wrapper( |
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| 201 | Statement * wraps, FunctionDecl * resume_handler ); |
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| 202 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt ); |
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| 203 | ObjectDecl * create_finally_hook( FunctionDecl * finally_wrapper ); |
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| 204 | |
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| 205 | // Types used in translation, make sure to use clone. |
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| 206 | // void (*function)(); |
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| 207 | FunctionType try_func_t; |
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| 208 | // void (*function)(int, exception); |
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| 209 | FunctionType catch_func_t; |
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| 210 | // int (*function)(exception); |
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| 211 | FunctionType match_func_t; |
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| 212 | // bool (*function)(exception); |
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| 213 | FunctionType handle_func_t; |
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| 214 | // void (*function)(__attribute__((unused)) void *); |
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| 215 | FunctionType finally_func_t; |
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| 216 | |
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| 217 | StructInstType * create_except_type() { |
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| 218 | assert( except_decl ); |
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| 219 | return new StructInstType( noQualifiers, except_decl ); |
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| 220 | } |
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| 221 | void init_func_types(); |
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| 222 | |
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| 223 | public: |
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[046a890] | 224 | TryMutatorCore() : |
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[948b0c8] | 225 | except_decl( nullptr ), node_decl( nullptr ), hook_decl( nullptr ), |
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| 226 | try_func_t( noQualifiers, false ), |
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| 227 | catch_func_t( noQualifiers, false ), |
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| 228 | match_func_t( noQualifiers, false ), |
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| 229 | handle_func_t( noQualifiers, false ), |
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| 230 | finally_func_t( noQualifiers, false ) |
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[cbce272] | 231 | {} |
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[948b0c8] | 232 | |
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| 233 | void premutate( StructDecl *structDecl ); |
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| 234 | Statement * postmutate( ThrowStmt *throwStmt ); |
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| 235 | Statement * postmutate( TryStmt *tryStmt ); |
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| 236 | }; |
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| 237 | |
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[046a890] | 238 | void TryMutatorCore::init_func_types() { |
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[cbce272] | 239 | assert( except_decl ); |
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| 240 | |
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[ba912706] | 241 | ObjectDecl index_obj( |
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[288eede] | 242 | "__handler_index", |
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[ba912706] | 243 | Type::StorageClasses(), |
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| 244 | LinkageSpec::Cforall, |
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| 245 | /*bitfieldWidth*/ NULL, |
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[ac10576] | 246 | new BasicType( noQualifiers, BasicType::SignedInt ), |
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[ba912706] | 247 | /*init*/ NULL |
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[307a732] | 248 | ); |
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[ba912706] | 249 | ObjectDecl exception_obj( |
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[288eede] | 250 | "__exception_inst", |
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[ba912706] | 251 | Type::StorageClasses(), |
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| 252 | LinkageSpec::Cforall, |
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| 253 | /*bitfieldWidth*/ NULL, |
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[307a732] | 254 | new PointerType( |
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[ac10576] | 255 | noQualifiers, |
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[cbce272] | 256 | new StructInstType( noQualifiers, except_decl ) |
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[307a732] | 257 | ), |
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[ba912706] | 258 | /*init*/ NULL |
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[307a732] | 259 | ); |
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[ba912706] | 260 | ObjectDecl bool_obj( |
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[288eede] | 261 | "__ret_bool", |
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[ba912706] | 262 | Type::StorageClasses(), |
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| 263 | LinkageSpec::Cforall, |
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| 264 | /*bitfieldWidth*/ NULL, |
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[948b0c8] | 265 | new BasicType( noQualifiers, BasicType::Bool ), |
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[8f6dfe7] | 266 | /*init*/ NULL, |
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| 267 | std::list<Attribute *>{ new Attribute( "unused" ) } |
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[307a732] | 268 | ); |
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| 269 | ObjectDecl voidptr_obj( |
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| 270 | "__hook", |
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| 271 | Type::StorageClasses(), |
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| 272 | LinkageSpec::Cforall, |
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| 273 | NULL, |
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| 274 | new PointerType( |
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[ac10576] | 275 | noQualifiers, |
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[307a732] | 276 | new VoidType( |
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[ac10576] | 277 | noQualifiers |
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[307a732] | 278 | ), |
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[948b0c8] | 279 | std::list<Attribute *>{ new Attribute( "unused" ) } |
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[307a732] | 280 | ), |
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| 281 | NULL |
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| 282 | ); |
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[ba912706] | 283 | |
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[8f6dfe7] | 284 | ObjectDecl * unused_index_obj = index_obj.clone(); |
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| 285 | unused_index_obj->attributes.push_back( new Attribute( "unused" ) ); |
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| 286 | |
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[307a732] | 287 | catch_func_t.get_parameters().push_back( index_obj.clone() ); |
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| 288 | catch_func_t.get_parameters().push_back( exception_obj.clone() ); |
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[8f6dfe7] | 289 | match_func_t.get_returnVals().push_back( unused_index_obj ); |
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[307a732] | 290 | match_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 291 | handle_func_t.get_returnVals().push_back( bool_obj.clone() ); |
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| 292 | handle_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 293 | finally_func_t.get_parameters().push_back( voidptr_obj.clone() ); |
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[ba912706] | 294 | } |
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| 295 | |
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| 296 | // TryStmt Mutation Helpers |
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| 297 | |
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[046a890] | 298 | CompoundStmt * TryMutatorCore::take_try_block( TryStmt *tryStmt ) { |
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[ba912706] | 299 | CompoundStmt * block = tryStmt->get_block(); |
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| 300 | tryStmt->set_block( nullptr ); |
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| 301 | return block; |
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| 302 | } |
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[948b0c8] | 303 | |
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[046a890] | 304 | FunctionDecl * TryMutatorCore::create_try_wrapper( |
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[948b0c8] | 305 | CompoundStmt *body ) { |
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[ba912706] | 306 | |
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[288eede] | 307 | return new FunctionDecl( "try", Type::StorageClasses(), |
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[307a732] | 308 | LinkageSpec::Cforall, try_func_t.clone(), body ); |
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[ba912706] | 309 | } |
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| 310 | |
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[046a890] | 311 | FunctionDecl * TryMutatorCore::create_terminate_catch( |
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[948b0c8] | 312 | CatchList &handlers ) { |
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[ba912706] | 313 | std::list<CaseStmt *> handler_wrappers; |
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| 314 | |
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[288eede] | 315 | FunctionType *func_type = catch_func_t.clone(); |
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| 316 | DeclarationWithType * index_obj = func_type->get_parameters().front(); |
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[86d5ba7c] | 317 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[288eede] | 318 | |
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[ba912706] | 319 | // Index 1..{number of handlers} |
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| 320 | int index = 0; |
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| 321 | CatchList::iterator it = handlers.begin(); |
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| 322 | for ( ; it != handlers.end() ; ++it ) { |
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| 323 | ++index; |
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| 324 | CatchStmt * handler = *it; |
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| 325 | |
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[288eede] | 326 | // case `index`: |
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| 327 | // { |
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[cbce272] | 328 | // `handler.decl` = { (virtual `decl.type`)`except` }; |
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| 329 | // `handler.body`; |
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[288eede] | 330 | // } |
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| 331 | // return; |
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[ba3706f] | 332 | CompoundStmt * block = new CompoundStmt(); |
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[86d5ba7c] | 333 | |
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[03eedd5] | 334 | // Just copy the exception value. (Post Validation) |
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[86d5ba7c] | 335 | ObjectDecl * handler_decl = |
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[03eedd5] | 336 | static_cast<ObjectDecl *>( handler->get_decl() ); |
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[86d5ba7c] | 337 | ObjectDecl * local_except = handler_decl->clone(); |
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[03eedd5] | 338 | local_except->set_init( |
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[86d5ba7c] | 339 | new ListInit({ new SingleInit( |
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| 340 | new VirtualCastExpr( nameOf( except_obj ), |
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| 341 | local_except->get_type() |
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| 342 | ) |
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[03eedd5] | 343 | ) }) |
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| 344 | ); |
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[ba3706f] | 345 | block->push_back( new DeclStmt( local_except ) ); |
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[86d5ba7c] | 346 | |
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| 347 | // Add the cleanup attribute. |
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| 348 | local_except->get_attributes().push_back( new Attribute( |
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| 349 | "cleanup", |
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[3090127] | 350 | { new NameExpr( "__cfaehm_cleanup_terminate" ) } |
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[86d5ba7c] | 351 | ) ); |
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| 352 | |
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| 353 | // Update variables in the body to point to this local copy. |
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| 354 | { |
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[7862059] | 355 | DeclReplacer::DeclMap mapping; |
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[86d5ba7c] | 356 | mapping[ handler_decl ] = local_except; |
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[7862059] | 357 | DeclReplacer::replace( handler->body, mapping ); |
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[86d5ba7c] | 358 | } |
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| 359 | |
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[7543dec] | 360 | block->push_back( handler->body ); |
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| 361 | handler->body = nullptr; |
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[288eede] | 362 | |
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[86d5ba7c] | 363 | std::list<Statement *> caseBody |
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[ba3706f] | 364 | { block, new ReturnStmt( nullptr ) }; |
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[288eede] | 365 | handler_wrappers.push_back( new CaseStmt( |
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[ba912706] | 366 | new ConstantExpr( Constant::from_int( index ) ), |
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[288eede] | 367 | caseBody |
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| 368 | ) ); |
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[ba912706] | 369 | } |
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| 370 | // TODO: Some sort of meaningful error on default perhaps? |
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| 371 | |
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[288eede] | 372 | std::list<Statement*> stmt_handlers; |
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| 373 | while ( !handler_wrappers.empty() ) { |
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| 374 | stmt_handlers.push_back( handler_wrappers.front() ); |
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| 375 | handler_wrappers.pop_front(); |
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| 376 | } |
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| 377 | |
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[ba912706] | 378 | SwitchStmt * handler_lookup = new SwitchStmt( |
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[288eede] | 379 | nameOf( index_obj ), |
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| 380 | stmt_handlers |
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[ba912706] | 381 | ); |
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[ba3706f] | 382 | CompoundStmt * body = new CompoundStmt(); |
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[ba912706] | 383 | body->push_back( handler_lookup ); |
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| 384 | |
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| 385 | return new FunctionDecl("catch", Type::StorageClasses(), |
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[288eede] | 386 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 387 | } |
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| 388 | |
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| 389 | // Create a single check from a moddified handler. |
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[288eede] | 390 | // except_obj is referenced, modded_handler will be freed. |
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[046a890] | 391 | CompoundStmt * TryMutatorCore::create_single_matcher( |
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[288eede] | 392 | DeclarationWithType * except_obj, CatchStmt * modded_handler ) { |
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[86d5ba7c] | 393 | // { |
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| 394 | // `modded_handler.decl` |
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[cbce272] | 395 | // if ( `decl.name = (virtual `decl.type`)`except` |
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[86d5ba7c] | 396 | // [&& `modded_handler.cond`] ) { |
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| 397 | // `modded_handler.body` |
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| 398 | // } |
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| 399 | // } |
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| 400 | |
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[ba3706f] | 401 | CompoundStmt * block = new CompoundStmt(); |
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[cbce272] | 402 | |
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| 403 | // Local Declaration |
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| 404 | ObjectDecl * local_except = |
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| 405 | dynamic_cast<ObjectDecl *>( modded_handler->get_decl() ); |
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| 406 | assert( local_except ); |
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[ba3706f] | 407 | block->push_back( new DeclStmt( local_except ) ); |
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[cbce272] | 408 | |
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[86d5ba7c] | 409 | // Check for type match. |
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| 410 | Expression * cond = UntypedExpr::createAssign( nameOf( local_except ), |
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| 411 | new VirtualCastExpr( nameOf( except_obj ), |
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| 412 | local_except->get_type()->clone() ) ); |
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[ba912706] | 413 | |
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[86d5ba7c] | 414 | // Add the check on the conditional if it is provided. |
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[ba912706] | 415 | if ( modded_handler->get_cond() ) { |
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[288eede] | 416 | cond = new LogicalExpr( cond, modded_handler->get_cond() ); |
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[ba912706] | 417 | } |
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[86d5ba7c] | 418 | // Construct the match condition. |
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[ba3706f] | 419 | block->push_back( new IfStmt( |
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[288eede] | 420 | cond, modded_handler->get_body(), nullptr ) ); |
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[ba912706] | 421 | |
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| 422 | modded_handler->set_decl( nullptr ); |
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| 423 | modded_handler->set_cond( nullptr ); |
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| 424 | modded_handler->set_body( nullptr ); |
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| 425 | delete modded_handler; |
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| 426 | return block; |
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| 427 | } |
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| 428 | |
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[046a890] | 429 | FunctionDecl * TryMutatorCore::create_terminate_match( |
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[948b0c8] | 430 | CatchList &handlers ) { |
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[86d5ba7c] | 431 | // int match(exception * except) { |
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| 432 | // HANDLER WRAPPERS { return `index`; } |
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| 433 | // } |
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| 434 | |
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[ba3706f] | 435 | CompoundStmt * body = new CompoundStmt(); |
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[ba912706] | 436 | |
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[288eede] | 437 | FunctionType * func_type = match_func_t.clone(); |
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| 438 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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| 439 | |
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[ba912706] | 440 | // Index 1..{number of handlers} |
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| 441 | int index = 0; |
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| 442 | CatchList::iterator it; |
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| 443 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 444 | ++index; |
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| 445 | CatchStmt * handler = *it; |
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| 446 | |
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[288eede] | 447 | // Body should have been taken by create_terminate_catch. |
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| 448 | assert( nullptr == handler->get_body() ); |
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| 449 | |
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| 450 | // Create new body. |
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[ba3706f] | 451 | handler->set_body( new ReturnStmt( |
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[ba912706] | 452 | new ConstantExpr( Constant::from_int( index ) ) ) ); |
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| 453 | |
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[288eede] | 454 | // Create the handler. |
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| 455 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 456 | *it = nullptr; |
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[ba912706] | 457 | } |
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| 458 | |
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[ba3706f] | 459 | body->push_back( new ReturnStmt( |
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[e9145a3] | 460 | new ConstantExpr( Constant::from_int( 0 ) ) ) ); |
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[307a732] | 461 | |
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[ba912706] | 462 | return new FunctionDecl("match", Type::StorageClasses(), |
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[288eede] | 463 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 464 | } |
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| 465 | |
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[046a890] | 466 | CompoundStmt * TryMutatorCore::create_terminate_caller( |
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[ba912706] | 467 | FunctionDecl * try_wrapper, |
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| 468 | FunctionDecl * terminate_catch, |
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[948b0c8] | 469 | FunctionDecl * terminate_match ) { |
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[3090127] | 470 | // { __cfaehm_try_terminate(`try`, `catch`, `match`); } |
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[ba912706] | 471 | |
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[288eede] | 472 | UntypedExpr * caller = new UntypedExpr( new NameExpr( |
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[3090127] | 473 | "__cfaehm_try_terminate" ) ); |
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[288eede] | 474 | std::list<Expression *>& args = caller->get_args(); |
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[ba912706] | 475 | args.push_back( nameOf( try_wrapper ) ); |
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| 476 | args.push_back( nameOf( terminate_catch ) ); |
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| 477 | args.push_back( nameOf( terminate_match ) ); |
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| 478 | |
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[ba3706f] | 479 | CompoundStmt * callStmt = new CompoundStmt(); |
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| 480 | callStmt->push_back( new ExprStmt( caller ) ); |
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[288eede] | 481 | return callStmt; |
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[ba912706] | 482 | } |
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| 483 | |
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[046a890] | 484 | FunctionDecl * TryMutatorCore::create_resume_handler( |
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[948b0c8] | 485 | CatchList &handlers ) { |
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[86d5ba7c] | 486 | // bool handle(exception * except) { |
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| 487 | // HANDLER WRAPPERS { `hander->body`; return true; } |
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| 488 | // } |
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[ba3706f] | 489 | CompoundStmt * body = new CompoundStmt(); |
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[288eede] | 490 | |
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[e9145a3] | 491 | FunctionType * func_type = handle_func_t.clone(); |
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[288eede] | 492 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[ba912706] | 493 | |
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| 494 | CatchList::iterator it; |
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| 495 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 496 | CatchStmt * handler = *it; |
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| 497 | |
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| 498 | // Modifiy body. |
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| 499 | CompoundStmt * handling_code = |
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| 500 | dynamic_cast<CompoundStmt*>( handler->get_body() ); |
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| 501 | if ( ! handling_code ) { |
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[ba3706f] | 502 | handling_code = new CompoundStmt(); |
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[ba912706] | 503 | handling_code->push_back( handler->get_body() ); |
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| 504 | } |
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[ba3706f] | 505 | handling_code->push_back( new ReturnStmt( |
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[ad0be81] | 506 | new ConstantExpr( Constant::from_bool( true ) ) ) ); |
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[ba912706] | 507 | handler->set_body( handling_code ); |
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| 508 | |
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| 509 | // Create the handler. |
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[288eede] | 510 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 511 | *it = nullptr; |
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[ba912706] | 512 | } |
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| 513 | |
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[ba3706f] | 514 | body->push_back( new ReturnStmt( |
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[e9145a3] | 515 | new ConstantExpr( Constant::from_bool( false ) ) ) ); |
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[ad0be81] | 516 | |
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[ba912706] | 517 | return new FunctionDecl("handle", Type::StorageClasses(), |
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[288eede] | 518 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 519 | } |
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| 520 | |
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[046a890] | 521 | CompoundStmt * TryMutatorCore::create_resume_wrapper( |
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[ba912706] | 522 | Statement * wraps, |
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| 523 | FunctionDecl * resume_handler ) { |
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[ba3706f] | 524 | CompoundStmt * body = new CompoundStmt(); |
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[ba912706] | 525 | |
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[288eede] | 526 | // struct __try_resume_node __resume_node |
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[3090127] | 527 | // __attribute__((cleanup( __cfaehm_try_resume_cleanup ))); |
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[288eede] | 528 | // ** unwinding of the stack here could cause problems ** |
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| 529 | // ** however I don't think that can happen currently ** |
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[3090127] | 530 | // __cfaehm_try_resume_setup( &__resume_node, resume_handler ); |
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[ba912706] | 531 | |
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| 532 | std::list< Attribute * > attributes; |
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| 533 | { |
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| 534 | std::list< Expression * > attr_params; |
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[288eede] | 535 | attr_params.push_back( new NameExpr( |
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[3090127] | 536 | "__cfaehm_try_resume_cleanup" ) ); |
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[288eede] | 537 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 538 | } |
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| 539 | |
---|
[288eede] | 540 | ObjectDecl * obj = new ObjectDecl( |
---|
| 541 | "__resume_node", |
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[ba912706] | 542 | Type::StorageClasses(), |
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| 543 | LinkageSpec::Cforall, |
---|
| 544 | nullptr, |
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[288eede] | 545 | new StructInstType( |
---|
| 546 | Type::Qualifiers(), |
---|
| 547 | node_decl |
---|
| 548 | ), |
---|
| 549 | nullptr, |
---|
[ba912706] | 550 | attributes |
---|
[288eede] | 551 | ); |
---|
| 552 | appendDeclStmt( body, obj ); |
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| 553 | |
---|
| 554 | UntypedExpr *setup = new UntypedExpr( new NameExpr( |
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[3090127] | 555 | "__cfaehm_try_resume_setup" ) ); |
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[307a732] | 556 | setup->get_args().push_back( new AddressExpr( nameOf( obj ) ) ); |
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[288eede] | 557 | setup->get_args().push_back( nameOf( resume_handler ) ); |
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| 558 | |
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[ba3706f] | 559 | body->push_back( new ExprStmt( setup ) ); |
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[288eede] | 560 | |
---|
[ba912706] | 561 | body->push_back( wraps ); |
---|
| 562 | return body; |
---|
| 563 | } |
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| 564 | |
---|
[046a890] | 565 | FunctionDecl * TryMutatorCore::create_finally_wrapper( |
---|
[948b0c8] | 566 | TryStmt * tryStmt ) { |
---|
[66ba544] | 567 | // void finally() { `finally->block` } |
---|
[288eede] | 568 | FinallyStmt * finally = tryStmt->get_finally(); |
---|
| 569 | CompoundStmt * body = finally->get_block(); |
---|
| 570 | finally->set_block( nullptr ); |
---|
| 571 | delete finally; |
---|
[ba912706] | 572 | tryStmt->set_finally( nullptr ); |
---|
| 573 | |
---|
| 574 | return new FunctionDecl("finally", Type::StorageClasses(), |
---|
[307a732] | 575 | LinkageSpec::Cforall, finally_func_t.clone(), body); |
---|
[ba912706] | 576 | } |
---|
| 577 | |
---|
[046a890] | 578 | ObjectDecl * TryMutatorCore::create_finally_hook( |
---|
[948b0c8] | 579 | FunctionDecl * finally_wrapper ) { |
---|
[3090127] | 580 | // struct __cfaehm_cleanup_hook __finally_hook |
---|
[046a890] | 581 | // __attribute__((cleanup( `finally_wrapper` ))); |
---|
[ba912706] | 582 | |
---|
| 583 | // Make Cleanup Attribute. |
---|
| 584 | std::list< Attribute * > attributes; |
---|
| 585 | { |
---|
| 586 | std::list< Expression * > attr_params; |
---|
| 587 | attr_params.push_back( nameOf( finally_wrapper ) ); |
---|
[288eede] | 588 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
---|
[ba912706] | 589 | } |
---|
| 590 | |
---|
[288eede] | 591 | return new ObjectDecl( |
---|
| 592 | "__finally_hook", |
---|
[ba912706] | 593 | Type::StorageClasses(), |
---|
| 594 | LinkageSpec::Cforall, |
---|
| 595 | nullptr, |
---|
[288eede] | 596 | new StructInstType( |
---|
[ac10576] | 597 | noQualifiers, |
---|
[288eede] | 598 | hook_decl |
---|
| 599 | ), |
---|
[ba912706] | 600 | nullptr, |
---|
| 601 | attributes |
---|
| 602 | ); |
---|
| 603 | } |
---|
| 604 | |
---|
[948b0c8] | 605 | // Visiting/Mutating Functions |
---|
[046a890] | 606 | void TryMutatorCore::premutate( StructDecl *structDecl ) { |
---|
[86d5ba7c] | 607 | if ( !structDecl->has_body() ) { |
---|
| 608 | // Skip children? |
---|
| 609 | return; |
---|
[3090127] | 610 | } else if ( structDecl->get_name() == "__cfaehm_base_exception_t" ) { |
---|
[cbce272] | 611 | assert( nullptr == except_decl ); |
---|
| 612 | except_decl = structDecl; |
---|
| 613 | init_func_types(); |
---|
[3090127] | 614 | } else if ( structDecl->get_name() == "__cfaehm_try_resume_node" ) { |
---|
[86d5ba7c] | 615 | assert( nullptr == node_decl ); |
---|
| 616 | node_decl = structDecl; |
---|
[3090127] | 617 | } else if ( structDecl->get_name() == "__cfaehm_cleanup_hook" ) { |
---|
[86d5ba7c] | 618 | assert( nullptr == hook_decl ); |
---|
| 619 | hook_decl = structDecl; |
---|
| 620 | } |
---|
| 621 | } |
---|
| 622 | |
---|
[046a890] | 623 | Statement * TryMutatorCore::postmutate( ThrowStmt * ) { |
---|
| 624 | // All throws should be removed by this point. |
---|
| 625 | assert( false ); |
---|
[ba912706] | 626 | } |
---|
| 627 | |
---|
[046a890] | 628 | Statement * TryMutatorCore::postmutate( TryStmt *tryStmt ) { |
---|
[cbce272] | 629 | assert( except_decl ); |
---|
[288eede] | 630 | assert( node_decl ); |
---|
| 631 | assert( hook_decl ); |
---|
| 632 | |
---|
[ba912706] | 633 | // Generate a prefix for the function names? |
---|
| 634 | |
---|
[ba3706f] | 635 | CompoundStmt * block = new CompoundStmt(); |
---|
[288eede] | 636 | CompoundStmt * inner = take_try_block( tryStmt ); |
---|
[ba912706] | 637 | |
---|
| 638 | if ( tryStmt->get_finally() ) { |
---|
| 639 | // Define the helper function. |
---|
| 640 | FunctionDecl * finally_block = |
---|
| 641 | create_finally_wrapper( tryStmt ); |
---|
| 642 | appendDeclStmt( block, finally_block ); |
---|
| 643 | // Create and add the finally cleanup hook. |
---|
[948b0c8] | 644 | appendDeclStmt( block, create_finally_hook( finally_block ) ); |
---|
[ba912706] | 645 | } |
---|
| 646 | |
---|
[288eede] | 647 | CatchList termination_handlers; |
---|
| 648 | CatchList resumption_handlers; |
---|
| 649 | split( tryStmt->get_catchers(), |
---|
[1abc5ab] | 650 | termination_handlers, resumption_handlers ); |
---|
[ba912706] | 651 | |
---|
[288eede] | 652 | if ( resumption_handlers.size() ) { |
---|
[ba912706] | 653 | // Define the helper function. |
---|
| 654 | FunctionDecl * resume_handler = |
---|
| 655 | create_resume_handler( resumption_handlers ); |
---|
| 656 | appendDeclStmt( block, resume_handler ); |
---|
| 657 | // Prepare hooks |
---|
[948b0c8] | 658 | inner = create_resume_wrapper( inner, resume_handler ); |
---|
[ba912706] | 659 | } |
---|
| 660 | |
---|
| 661 | if ( termination_handlers.size() ) { |
---|
| 662 | // Define the three helper functions. |
---|
| 663 | FunctionDecl * try_wrapper = create_try_wrapper( inner ); |
---|
| 664 | appendDeclStmt( block, try_wrapper ); |
---|
| 665 | FunctionDecl * terminate_catch = |
---|
| 666 | create_terminate_catch( termination_handlers ); |
---|
| 667 | appendDeclStmt( block, terminate_catch ); |
---|
| 668 | FunctionDecl * terminate_match = |
---|
| 669 | create_terminate_match( termination_handlers ); |
---|
| 670 | appendDeclStmt( block, terminate_match ); |
---|
| 671 | // Build the call to the try wrapper. |
---|
| 672 | inner = create_terminate_caller( |
---|
| 673 | try_wrapper, terminate_catch, terminate_match ); |
---|
| 674 | } |
---|
| 675 | |
---|
| 676 | // Embed the try block. |
---|
| 677 | block->push_back( inner ); |
---|
| 678 | |
---|
| 679 | return block; |
---|
| 680 | } |
---|
| 681 | |
---|
[046a890] | 682 | void translateThrows( std::list< Declaration *> & translationUnit ) { |
---|
| 683 | PassVisitor<ThrowMutatorCore> translator; |
---|
| 684 | mutateAll( translationUnit, translator ); |
---|
| 685 | } |
---|
| 686 | |
---|
| 687 | void translateTries( std::list< Declaration *> & translationUnit ) { |
---|
| 688 | PassVisitor<TryMutatorCore> translator; |
---|
[6fca7ea] | 689 | mutateAll( translationUnit, translator ); |
---|
[ba912706] | 690 | } |
---|
| 691 | } |
---|