[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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[7f9968a] | 12 | // Last Modified On : Wed Jun 24 11:18:00 2020 |
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| 13 | // Update Count : 17 |
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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 | |
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| 75 | public: |
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| 76 | ThrowMutatorCore() : |
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| 77 | terminate_handler_except( nullptr ), |
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| 78 | cur_context( NoHandler ) |
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| 79 | {} |
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| 80 | |
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| 81 | void premutate( CatchStmt *catchStmt ); |
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| 82 | Statement * postmutate( ThrowStmt *throwStmt ); |
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| 83 | }; |
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| 84 | |
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| 85 | // ThrowStmt Mutation Helpers |
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| 86 | |
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| 87 | Statement * ThrowMutatorCore::create_either_throw( |
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| 88 | ThrowStmt * throwStmt, const char * throwFunc ) { |
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| 89 | // `throwFunc`( `throwStmt->get_name()` ); |
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| 90 | UntypedExpr * call = new UntypedExpr( new NameExpr( throwFunc ) ); |
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| 91 | call->get_args().push_back( throwStmt->get_expr() ); |
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| 92 | throwStmt->set_expr( nullptr ); |
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| 93 | delete throwStmt; |
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| 94 | return new ExprStmt( call ); |
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| 95 | } |
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| 96 | |
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| 97 | Statement * ThrowMutatorCore::create_terminate_rethrow( |
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| 98 | ThrowStmt *throwStmt ) { |
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| 99 | // { `terminate_handler_except` = 0p; __rethrow_terminate(); } |
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| 100 | assert( nullptr == throwStmt->get_expr() ); |
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| 101 | assert( terminate_handler_except ); |
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| 102 | |
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| 103 | CompoundStmt * result = new CompoundStmt(); |
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| 104 | result->labels = throwStmt->labels; |
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| 105 | result->push_back( new ExprStmt( UntypedExpr::createAssign( |
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| 106 | nameOf( terminate_handler_except ), |
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| 107 | new ConstantExpr( Constant::null( |
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[7119daa] | 108 | terminate_handler_except->get_type()->clone() |
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[046a890] | 109 | ) ) |
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| 110 | ) ) ); |
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| 111 | result->push_back( new ExprStmt( |
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| 112 | new UntypedExpr( new NameExpr( "__cfaehm_rethrow_terminate" ) ) |
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| 113 | ) ); |
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| 114 | delete throwStmt; |
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| 115 | return result; |
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| 116 | } |
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| 117 | |
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| 118 | // Visiting/Mutating Functions |
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| 119 | |
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| 120 | void ThrowMutatorCore::premutate( CatchStmt *catchStmt ) { |
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| 121 | // Validate the statement's form. |
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| 122 | ObjectDecl * decl = dynamic_cast<ObjectDecl *>( catchStmt->get_decl() ); |
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| 123 | // Also checking the type would be nice. |
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[b2de2e0] | 124 | if ( !decl || !dynamic_cast<PointerType *>( decl->type ) ) { |
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| 125 | std::string kind = (CatchStmt::Terminate == catchStmt->kind) ? "catch" : "catchResume"; |
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| 126 | SemanticError( catchStmt->location, kind + " must have pointer to an exception type" ); |
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[046a890] | 127 | } |
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| 128 | |
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| 129 | // Track the handler context. |
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| 130 | GuardValue( cur_context ); |
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| 131 | if ( CatchStmt::Terminate == catchStmt->get_kind() ) { |
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| 132 | cur_context = TerHandler; |
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| 133 | |
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| 134 | GuardValue( terminate_handler_except ); |
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| 135 | terminate_handler_except = decl; |
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| 136 | } else { |
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| 137 | cur_context = ResHandler; |
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| 138 | } |
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| 139 | } |
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| 140 | |
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| 141 | Statement * ThrowMutatorCore::postmutate( ThrowStmt *throwStmt ) { |
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| 142 | // Ignoring throwStmt->get_target() for now. |
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| 143 | if ( ThrowStmt::Terminate == throwStmt->get_kind() ) { |
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| 144 | if ( throwStmt->get_expr() ) { |
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| 145 | return create_either_throw( throwStmt, "$throw" ); |
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| 146 | } else if ( TerHandler == cur_context ) { |
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| 147 | return create_terminate_rethrow( throwStmt ); |
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| 148 | } else { |
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| 149 | abort("Invalid throw in %s at %i\n", |
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| 150 | throwStmt->location.filename.c_str(), |
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| 151 | throwStmt->location.first_line); |
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| 152 | } |
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| 153 | } else { |
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| 154 | if ( throwStmt->get_expr() ) { |
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| 155 | return create_either_throw( throwStmt, "$throwResume" ); |
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| 156 | } else if ( ResHandler == cur_context ) { |
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[7f9968a] | 157 | // This has to be handled later. |
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| 158 | return throwStmt; |
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[046a890] | 159 | } else { |
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| 160 | abort("Invalid throwResume in %s at %i\n", |
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| 161 | throwStmt->location.filename.c_str(), |
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| 162 | throwStmt->location.first_line); |
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| 163 | } |
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| 164 | } |
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| 165 | } |
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| 166 | |
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[66ba544] | 167 | class TryMutatorCore { |
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[948b0c8] | 168 | // The built in types used in translation. |
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| 169 | StructDecl * except_decl; |
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| 170 | StructDecl * node_decl; |
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| 171 | StructDecl * hook_decl; |
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| 172 | |
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| 173 | // The many helper functions for code/syntree generation. |
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| 174 | CompoundStmt * take_try_block( TryStmt * tryStmt ); |
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| 175 | FunctionDecl * create_try_wrapper( CompoundStmt * body ); |
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| 176 | FunctionDecl * create_terminate_catch( CatchList &handlers ); |
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| 177 | CompoundStmt * create_single_matcher( |
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| 178 | DeclarationWithType * except_obj, CatchStmt * modded_handler ); |
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| 179 | FunctionDecl * create_terminate_match( CatchList &handlers ); |
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| 180 | CompoundStmt * create_terminate_caller( FunctionDecl * try_wrapper, |
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| 181 | FunctionDecl * terminate_catch, FunctionDecl * terminate_match ); |
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| 182 | FunctionDecl * create_resume_handler( CatchList &handlers ); |
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| 183 | CompoundStmt * create_resume_wrapper( |
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| 184 | Statement * wraps, FunctionDecl * resume_handler ); |
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| 185 | FunctionDecl * create_finally_wrapper( TryStmt * tryStmt ); |
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| 186 | ObjectDecl * create_finally_hook( FunctionDecl * finally_wrapper ); |
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[7f9968a] | 187 | Statement * create_resume_rethrow( ThrowStmt * throwStmt ); |
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[948b0c8] | 188 | |
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| 189 | // Types used in translation, make sure to use clone. |
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| 190 | // void (*function)(); |
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| 191 | FunctionType try_func_t; |
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| 192 | // void (*function)(int, exception); |
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| 193 | FunctionType catch_func_t; |
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| 194 | // int (*function)(exception); |
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| 195 | FunctionType match_func_t; |
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| 196 | // bool (*function)(exception); |
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| 197 | FunctionType handle_func_t; |
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| 198 | // void (*function)(__attribute__((unused)) void *); |
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| 199 | FunctionType finally_func_t; |
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| 200 | |
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| 201 | StructInstType * create_except_type() { |
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| 202 | assert( except_decl ); |
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| 203 | return new StructInstType( noQualifiers, except_decl ); |
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| 204 | } |
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| 205 | void init_func_types(); |
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| 206 | |
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| 207 | public: |
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[046a890] | 208 | TryMutatorCore() : |
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[948b0c8] | 209 | except_decl( nullptr ), node_decl( nullptr ), hook_decl( nullptr ), |
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| 210 | try_func_t( noQualifiers, false ), |
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| 211 | catch_func_t( noQualifiers, false ), |
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| 212 | match_func_t( noQualifiers, false ), |
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| 213 | handle_func_t( noQualifiers, false ), |
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| 214 | finally_func_t( noQualifiers, false ) |
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[cbce272] | 215 | {} |
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[948b0c8] | 216 | |
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| 217 | void premutate( StructDecl *structDecl ); |
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| 218 | Statement * postmutate( TryStmt *tryStmt ); |
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[7f9968a] | 219 | Statement * postmutate( ThrowStmt *throwStmt ); |
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[948b0c8] | 220 | }; |
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| 221 | |
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[046a890] | 222 | void TryMutatorCore::init_func_types() { |
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[cbce272] | 223 | assert( except_decl ); |
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| 224 | |
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[ba912706] | 225 | ObjectDecl index_obj( |
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[288eede] | 226 | "__handler_index", |
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[ba912706] | 227 | Type::StorageClasses(), |
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| 228 | LinkageSpec::Cforall, |
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| 229 | /*bitfieldWidth*/ NULL, |
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[ac10576] | 230 | new BasicType( noQualifiers, BasicType::SignedInt ), |
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[ba912706] | 231 | /*init*/ NULL |
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[307a732] | 232 | ); |
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[ba912706] | 233 | ObjectDecl exception_obj( |
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[288eede] | 234 | "__exception_inst", |
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[ba912706] | 235 | Type::StorageClasses(), |
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| 236 | LinkageSpec::Cforall, |
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| 237 | /*bitfieldWidth*/ NULL, |
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[307a732] | 238 | new PointerType( |
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[ac10576] | 239 | noQualifiers, |
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[cbce272] | 240 | new StructInstType( noQualifiers, except_decl ) |
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[307a732] | 241 | ), |
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[ba912706] | 242 | /*init*/ NULL |
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[307a732] | 243 | ); |
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[ba912706] | 244 | ObjectDecl bool_obj( |
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[288eede] | 245 | "__ret_bool", |
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[ba912706] | 246 | Type::StorageClasses(), |
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| 247 | LinkageSpec::Cforall, |
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| 248 | /*bitfieldWidth*/ NULL, |
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[948b0c8] | 249 | new BasicType( noQualifiers, BasicType::Bool ), |
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[8f6dfe7] | 250 | /*init*/ NULL, |
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| 251 | std::list<Attribute *>{ new Attribute( "unused" ) } |
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[307a732] | 252 | ); |
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| 253 | ObjectDecl voidptr_obj( |
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| 254 | "__hook", |
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| 255 | Type::StorageClasses(), |
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| 256 | LinkageSpec::Cforall, |
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| 257 | NULL, |
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| 258 | new PointerType( |
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[ac10576] | 259 | noQualifiers, |
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[307a732] | 260 | new VoidType( |
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[ac10576] | 261 | noQualifiers |
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[307a732] | 262 | ), |
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[948b0c8] | 263 | std::list<Attribute *>{ new Attribute( "unused" ) } |
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[307a732] | 264 | ), |
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| 265 | NULL |
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| 266 | ); |
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[ba912706] | 267 | |
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[8f6dfe7] | 268 | ObjectDecl * unused_index_obj = index_obj.clone(); |
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| 269 | unused_index_obj->attributes.push_back( new Attribute( "unused" ) ); |
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| 270 | |
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[307a732] | 271 | catch_func_t.get_parameters().push_back( index_obj.clone() ); |
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| 272 | catch_func_t.get_parameters().push_back( exception_obj.clone() ); |
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[8f6dfe7] | 273 | match_func_t.get_returnVals().push_back( unused_index_obj ); |
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[307a732] | 274 | match_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 275 | handle_func_t.get_returnVals().push_back( bool_obj.clone() ); |
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| 276 | handle_func_t.get_parameters().push_back( exception_obj.clone() ); |
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| 277 | finally_func_t.get_parameters().push_back( voidptr_obj.clone() ); |
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[ba912706] | 278 | } |
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| 279 | |
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| 280 | // TryStmt Mutation Helpers |
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| 281 | |
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[046a890] | 282 | CompoundStmt * TryMutatorCore::take_try_block( TryStmt *tryStmt ) { |
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[ba912706] | 283 | CompoundStmt * block = tryStmt->get_block(); |
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| 284 | tryStmt->set_block( nullptr ); |
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| 285 | return block; |
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| 286 | } |
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[948b0c8] | 287 | |
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[046a890] | 288 | FunctionDecl * TryMutatorCore::create_try_wrapper( |
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[948b0c8] | 289 | CompoundStmt *body ) { |
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[ba912706] | 290 | |
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[288eede] | 291 | return new FunctionDecl( "try", Type::StorageClasses(), |
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[307a732] | 292 | LinkageSpec::Cforall, try_func_t.clone(), body ); |
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[ba912706] | 293 | } |
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| 294 | |
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[046a890] | 295 | FunctionDecl * TryMutatorCore::create_terminate_catch( |
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[948b0c8] | 296 | CatchList &handlers ) { |
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[ba912706] | 297 | std::list<CaseStmt *> handler_wrappers; |
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| 298 | |
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[288eede] | 299 | FunctionType *func_type = catch_func_t.clone(); |
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| 300 | DeclarationWithType * index_obj = func_type->get_parameters().front(); |
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[86d5ba7c] | 301 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[288eede] | 302 | |
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[ba912706] | 303 | // Index 1..{number of handlers} |
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| 304 | int index = 0; |
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| 305 | CatchList::iterator it = handlers.begin(); |
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| 306 | for ( ; it != handlers.end() ; ++it ) { |
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| 307 | ++index; |
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| 308 | CatchStmt * handler = *it; |
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| 309 | |
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[288eede] | 310 | // case `index`: |
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| 311 | // { |
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[cbce272] | 312 | // `handler.decl` = { (virtual `decl.type`)`except` }; |
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| 313 | // `handler.body`; |
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[288eede] | 314 | // } |
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| 315 | // return; |
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[ba3706f] | 316 | CompoundStmt * block = new CompoundStmt(); |
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[86d5ba7c] | 317 | |
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[03eedd5] | 318 | // Just copy the exception value. (Post Validation) |
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[86d5ba7c] | 319 | ObjectDecl * handler_decl = |
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[03eedd5] | 320 | static_cast<ObjectDecl *>( handler->get_decl() ); |
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[86d5ba7c] | 321 | ObjectDecl * local_except = handler_decl->clone(); |
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[03eedd5] | 322 | local_except->set_init( |
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[86d5ba7c] | 323 | new ListInit({ new SingleInit( |
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| 324 | new VirtualCastExpr( nameOf( except_obj ), |
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| 325 | local_except->get_type() |
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| 326 | ) |
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[03eedd5] | 327 | ) }) |
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| 328 | ); |
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[ba3706f] | 329 | block->push_back( new DeclStmt( local_except ) ); |
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[86d5ba7c] | 330 | |
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| 331 | // Add the cleanup attribute. |
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| 332 | local_except->get_attributes().push_back( new Attribute( |
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| 333 | "cleanup", |
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[3090127] | 334 | { new NameExpr( "__cfaehm_cleanup_terminate" ) } |
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[86d5ba7c] | 335 | ) ); |
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| 336 | |
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| 337 | // Update variables in the body to point to this local copy. |
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| 338 | { |
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[7862059] | 339 | DeclReplacer::DeclMap mapping; |
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[86d5ba7c] | 340 | mapping[ handler_decl ] = local_except; |
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[7862059] | 341 | DeclReplacer::replace( handler->body, mapping ); |
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[86d5ba7c] | 342 | } |
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| 343 | |
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[7543dec] | 344 | block->push_back( handler->body ); |
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| 345 | handler->body = nullptr; |
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[288eede] | 346 | |
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[86d5ba7c] | 347 | std::list<Statement *> caseBody |
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[ba3706f] | 348 | { block, new ReturnStmt( nullptr ) }; |
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[288eede] | 349 | handler_wrappers.push_back( new CaseStmt( |
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[ba912706] | 350 | new ConstantExpr( Constant::from_int( index ) ), |
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[288eede] | 351 | caseBody |
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| 352 | ) ); |
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[ba912706] | 353 | } |
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| 354 | // TODO: Some sort of meaningful error on default perhaps? |
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| 355 | |
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[288eede] | 356 | std::list<Statement*> stmt_handlers; |
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| 357 | while ( !handler_wrappers.empty() ) { |
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| 358 | stmt_handlers.push_back( handler_wrappers.front() ); |
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| 359 | handler_wrappers.pop_front(); |
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| 360 | } |
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| 361 | |
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[ba912706] | 362 | SwitchStmt * handler_lookup = new SwitchStmt( |
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[288eede] | 363 | nameOf( index_obj ), |
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| 364 | stmt_handlers |
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[ba912706] | 365 | ); |
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[ba3706f] | 366 | CompoundStmt * body = new CompoundStmt(); |
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[ba912706] | 367 | body->push_back( handler_lookup ); |
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| 368 | |
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| 369 | return new FunctionDecl("catch", Type::StorageClasses(), |
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[288eede] | 370 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 371 | } |
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| 372 | |
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| 373 | // Create a single check from a moddified handler. |
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[288eede] | 374 | // except_obj is referenced, modded_handler will be freed. |
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[046a890] | 375 | CompoundStmt * TryMutatorCore::create_single_matcher( |
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[288eede] | 376 | DeclarationWithType * except_obj, CatchStmt * modded_handler ) { |
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[86d5ba7c] | 377 | // { |
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| 378 | // `modded_handler.decl` |
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[cbce272] | 379 | // if ( `decl.name = (virtual `decl.type`)`except` |
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[86d5ba7c] | 380 | // [&& `modded_handler.cond`] ) { |
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| 381 | // `modded_handler.body` |
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| 382 | // } |
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| 383 | // } |
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| 384 | |
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[ba3706f] | 385 | CompoundStmt * block = new CompoundStmt(); |
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[cbce272] | 386 | |
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| 387 | // Local Declaration |
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| 388 | ObjectDecl * local_except = |
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| 389 | dynamic_cast<ObjectDecl *>( modded_handler->get_decl() ); |
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| 390 | assert( local_except ); |
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[ba3706f] | 391 | block->push_back( new DeclStmt( local_except ) ); |
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[cbce272] | 392 | |
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[86d5ba7c] | 393 | // Check for type match. |
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| 394 | Expression * cond = UntypedExpr::createAssign( nameOf( local_except ), |
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| 395 | new VirtualCastExpr( nameOf( except_obj ), |
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| 396 | local_except->get_type()->clone() ) ); |
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[ba912706] | 397 | |
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[86d5ba7c] | 398 | // Add the check on the conditional if it is provided. |
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[ba912706] | 399 | if ( modded_handler->get_cond() ) { |
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[288eede] | 400 | cond = new LogicalExpr( cond, modded_handler->get_cond() ); |
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[ba912706] | 401 | } |
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[86d5ba7c] | 402 | // Construct the match condition. |
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[ba3706f] | 403 | block->push_back( new IfStmt( |
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[288eede] | 404 | cond, modded_handler->get_body(), nullptr ) ); |
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[ba912706] | 405 | |
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| 406 | modded_handler->set_decl( nullptr ); |
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| 407 | modded_handler->set_cond( nullptr ); |
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| 408 | modded_handler->set_body( nullptr ); |
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| 409 | delete modded_handler; |
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| 410 | return block; |
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| 411 | } |
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| 412 | |
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[046a890] | 413 | FunctionDecl * TryMutatorCore::create_terminate_match( |
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[948b0c8] | 414 | CatchList &handlers ) { |
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[86d5ba7c] | 415 | // int match(exception * except) { |
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| 416 | // HANDLER WRAPPERS { return `index`; } |
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| 417 | // } |
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| 418 | |
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[ba3706f] | 419 | CompoundStmt * body = new CompoundStmt(); |
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[ba912706] | 420 | |
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[288eede] | 421 | FunctionType * func_type = match_func_t.clone(); |
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| 422 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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| 423 | |
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[ba912706] | 424 | // Index 1..{number of handlers} |
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| 425 | int index = 0; |
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| 426 | CatchList::iterator it; |
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| 427 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 428 | ++index; |
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| 429 | CatchStmt * handler = *it; |
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| 430 | |
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[288eede] | 431 | // Body should have been taken by create_terminate_catch. |
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| 432 | assert( nullptr == handler->get_body() ); |
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| 433 | |
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| 434 | // Create new body. |
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[ba3706f] | 435 | handler->set_body( new ReturnStmt( |
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[ba912706] | 436 | new ConstantExpr( Constant::from_int( index ) ) ) ); |
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| 437 | |
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[288eede] | 438 | // Create the handler. |
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| 439 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 440 | *it = nullptr; |
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[ba912706] | 441 | } |
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| 442 | |
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[ba3706f] | 443 | body->push_back( new ReturnStmt( |
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[e9145a3] | 444 | new ConstantExpr( Constant::from_int( 0 ) ) ) ); |
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[307a732] | 445 | |
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[ba912706] | 446 | return new FunctionDecl("match", Type::StorageClasses(), |
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[288eede] | 447 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 448 | } |
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| 449 | |
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[046a890] | 450 | CompoundStmt * TryMutatorCore::create_terminate_caller( |
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[ba912706] | 451 | FunctionDecl * try_wrapper, |
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| 452 | FunctionDecl * terminate_catch, |
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[948b0c8] | 453 | FunctionDecl * terminate_match ) { |
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[3090127] | 454 | // { __cfaehm_try_terminate(`try`, `catch`, `match`); } |
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[ba912706] | 455 | |
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[288eede] | 456 | UntypedExpr * caller = new UntypedExpr( new NameExpr( |
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[3090127] | 457 | "__cfaehm_try_terminate" ) ); |
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[288eede] | 458 | std::list<Expression *>& args = caller->get_args(); |
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[ba912706] | 459 | args.push_back( nameOf( try_wrapper ) ); |
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| 460 | args.push_back( nameOf( terminate_catch ) ); |
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| 461 | args.push_back( nameOf( terminate_match ) ); |
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| 462 | |
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[ba3706f] | 463 | CompoundStmt * callStmt = new CompoundStmt(); |
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| 464 | callStmt->push_back( new ExprStmt( caller ) ); |
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[288eede] | 465 | return callStmt; |
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[ba912706] | 466 | } |
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| 467 | |
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[046a890] | 468 | FunctionDecl * TryMutatorCore::create_resume_handler( |
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[948b0c8] | 469 | CatchList &handlers ) { |
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[86d5ba7c] | 470 | // bool handle(exception * except) { |
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| 471 | // HANDLER WRAPPERS { `hander->body`; return true; } |
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| 472 | // } |
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[ba3706f] | 473 | CompoundStmt * body = new CompoundStmt(); |
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[288eede] | 474 | |
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[e9145a3] | 475 | FunctionType * func_type = handle_func_t.clone(); |
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[288eede] | 476 | DeclarationWithType * except_obj = func_type->get_parameters().back(); |
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[ba912706] | 477 | |
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| 478 | CatchList::iterator it; |
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| 479 | for ( it = handlers.begin() ; it != handlers.end() ; ++it ) { |
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| 480 | CatchStmt * handler = *it; |
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| 481 | |
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| 482 | // Modifiy body. |
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| 483 | CompoundStmt * handling_code = |
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| 484 | dynamic_cast<CompoundStmt*>( handler->get_body() ); |
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| 485 | if ( ! handling_code ) { |
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[ba3706f] | 486 | handling_code = new CompoundStmt(); |
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[ba912706] | 487 | handling_code->push_back( handler->get_body() ); |
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| 488 | } |
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[ba3706f] | 489 | handling_code->push_back( new ReturnStmt( |
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[ad0be81] | 490 | new ConstantExpr( Constant::from_bool( true ) ) ) ); |
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[ba912706] | 491 | handler->set_body( handling_code ); |
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| 492 | |
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| 493 | // Create the handler. |
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[288eede] | 494 | body->push_back( create_single_matcher( except_obj, handler ) ); |
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| 495 | *it = nullptr; |
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[ba912706] | 496 | } |
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| 497 | |
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[ba3706f] | 498 | body->push_back( new ReturnStmt( |
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[e9145a3] | 499 | new ConstantExpr( Constant::from_bool( false ) ) ) ); |
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[ad0be81] | 500 | |
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[ba912706] | 501 | return new FunctionDecl("handle", Type::StorageClasses(), |
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[288eede] | 502 | LinkageSpec::Cforall, func_type, body); |
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[ba912706] | 503 | } |
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| 504 | |
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[046a890] | 505 | CompoundStmt * TryMutatorCore::create_resume_wrapper( |
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[ba912706] | 506 | Statement * wraps, |
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| 507 | FunctionDecl * resume_handler ) { |
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[ba3706f] | 508 | CompoundStmt * body = new CompoundStmt(); |
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[ba912706] | 509 | |
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[288eede] | 510 | // struct __try_resume_node __resume_node |
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[3090127] | 511 | // __attribute__((cleanup( __cfaehm_try_resume_cleanup ))); |
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[288eede] | 512 | // ** unwinding of the stack here could cause problems ** |
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| 513 | // ** however I don't think that can happen currently ** |
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[3090127] | 514 | // __cfaehm_try_resume_setup( &__resume_node, resume_handler ); |
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[ba912706] | 515 | |
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| 516 | std::list< Attribute * > attributes; |
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| 517 | { |
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| 518 | std::list< Expression * > attr_params; |
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[288eede] | 519 | attr_params.push_back( new NameExpr( |
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[3090127] | 520 | "__cfaehm_try_resume_cleanup" ) ); |
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[288eede] | 521 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 522 | } |
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| 523 | |
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[288eede] | 524 | ObjectDecl * obj = new ObjectDecl( |
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| 525 | "__resume_node", |
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[ba912706] | 526 | Type::StorageClasses(), |
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| 527 | LinkageSpec::Cforall, |
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| 528 | nullptr, |
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[288eede] | 529 | new StructInstType( |
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| 530 | Type::Qualifiers(), |
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| 531 | node_decl |
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| 532 | ), |
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| 533 | nullptr, |
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[ba912706] | 534 | attributes |
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[288eede] | 535 | ); |
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| 536 | appendDeclStmt( body, obj ); |
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| 537 | |
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| 538 | UntypedExpr *setup = new UntypedExpr( new NameExpr( |
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[3090127] | 539 | "__cfaehm_try_resume_setup" ) ); |
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[307a732] | 540 | setup->get_args().push_back( new AddressExpr( nameOf( obj ) ) ); |
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[288eede] | 541 | setup->get_args().push_back( nameOf( resume_handler ) ); |
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| 542 | |
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[ba3706f] | 543 | body->push_back( new ExprStmt( setup ) ); |
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[288eede] | 544 | |
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[ba912706] | 545 | body->push_back( wraps ); |
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| 546 | return body; |
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| 547 | } |
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| 548 | |
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[046a890] | 549 | FunctionDecl * TryMutatorCore::create_finally_wrapper( |
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[948b0c8] | 550 | TryStmt * tryStmt ) { |
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[66ba544] | 551 | // void finally() { `finally->block` } |
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[288eede] | 552 | FinallyStmt * finally = tryStmt->get_finally(); |
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| 553 | CompoundStmt * body = finally->get_block(); |
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| 554 | finally->set_block( nullptr ); |
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| 555 | delete finally; |
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[ba912706] | 556 | tryStmt->set_finally( nullptr ); |
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| 557 | |
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| 558 | return new FunctionDecl("finally", Type::StorageClasses(), |
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[307a732] | 559 | LinkageSpec::Cforall, finally_func_t.clone(), body); |
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[ba912706] | 560 | } |
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| 561 | |
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[046a890] | 562 | ObjectDecl * TryMutatorCore::create_finally_hook( |
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[948b0c8] | 563 | FunctionDecl * finally_wrapper ) { |
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[3090127] | 564 | // struct __cfaehm_cleanup_hook __finally_hook |
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[046a890] | 565 | // __attribute__((cleanup( `finally_wrapper` ))); |
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[ba912706] | 566 | |
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| 567 | // Make Cleanup Attribute. |
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| 568 | std::list< Attribute * > attributes; |
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| 569 | { |
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| 570 | std::list< Expression * > attr_params; |
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| 571 | attr_params.push_back( nameOf( finally_wrapper ) ); |
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[288eede] | 572 | attributes.push_back( new Attribute( "cleanup", attr_params ) ); |
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[ba912706] | 573 | } |
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| 574 | |
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[288eede] | 575 | return new ObjectDecl( |
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| 576 | "__finally_hook", |
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[ba912706] | 577 | Type::StorageClasses(), |
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| 578 | LinkageSpec::Cforall, |
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| 579 | nullptr, |
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[288eede] | 580 | new StructInstType( |
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[ac10576] | 581 | noQualifiers, |
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[288eede] | 582 | hook_decl |
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| 583 | ), |
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[ba912706] | 584 | nullptr, |
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| 585 | attributes |
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| 586 | ); |
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| 587 | } |
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| 588 | |
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[7f9968a] | 589 | Statement * TryMutatorCore::create_resume_rethrow( ThrowStmt *throwStmt ) { |
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| 590 | // return false; |
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| 591 | Statement * result = new ReturnStmt( |
---|
| 592 | new ConstantExpr( Constant::from_bool( false ) ) |
---|
| 593 | ); |
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| 594 | result->labels = throwStmt->labels; |
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| 595 | delete throwStmt; |
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| 596 | return result; |
---|
| 597 | } |
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| 598 | |
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[948b0c8] | 599 | // Visiting/Mutating Functions |
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[046a890] | 600 | void TryMutatorCore::premutate( StructDecl *structDecl ) { |
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[86d5ba7c] | 601 | if ( !structDecl->has_body() ) { |
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| 602 | // Skip children? |
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| 603 | return; |
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[3090127] | 604 | } else if ( structDecl->get_name() == "__cfaehm_base_exception_t" ) { |
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[cbce272] | 605 | assert( nullptr == except_decl ); |
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| 606 | except_decl = structDecl; |
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| 607 | init_func_types(); |
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[3090127] | 608 | } else if ( structDecl->get_name() == "__cfaehm_try_resume_node" ) { |
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[86d5ba7c] | 609 | assert( nullptr == node_decl ); |
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| 610 | node_decl = structDecl; |
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[3090127] | 611 | } else if ( structDecl->get_name() == "__cfaehm_cleanup_hook" ) { |
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[86d5ba7c] | 612 | assert( nullptr == hook_decl ); |
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| 613 | hook_decl = structDecl; |
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| 614 | } |
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| 615 | } |
---|
| 616 | |
---|
[046a890] | 617 | Statement * TryMutatorCore::postmutate( TryStmt *tryStmt ) { |
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[cbce272] | 618 | assert( except_decl ); |
---|
[288eede] | 619 | assert( node_decl ); |
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| 620 | assert( hook_decl ); |
---|
| 621 | |
---|
[ba912706] | 622 | // Generate a prefix for the function names? |
---|
| 623 | |
---|
[ba3706f] | 624 | CompoundStmt * block = new CompoundStmt(); |
---|
[288eede] | 625 | CompoundStmt * inner = take_try_block( tryStmt ); |
---|
[ba912706] | 626 | |
---|
| 627 | if ( tryStmt->get_finally() ) { |
---|
| 628 | // Define the helper function. |
---|
| 629 | FunctionDecl * finally_block = |
---|
| 630 | create_finally_wrapper( tryStmt ); |
---|
| 631 | appendDeclStmt( block, finally_block ); |
---|
| 632 | // Create and add the finally cleanup hook. |
---|
[948b0c8] | 633 | appendDeclStmt( block, create_finally_hook( finally_block ) ); |
---|
[ba912706] | 634 | } |
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| 635 | |
---|
[288eede] | 636 | CatchList termination_handlers; |
---|
| 637 | CatchList resumption_handlers; |
---|
| 638 | split( tryStmt->get_catchers(), |
---|
[1abc5ab] | 639 | termination_handlers, resumption_handlers ); |
---|
[ba912706] | 640 | |
---|
[288eede] | 641 | if ( resumption_handlers.size() ) { |
---|
[ba912706] | 642 | // Define the helper function. |
---|
| 643 | FunctionDecl * resume_handler = |
---|
| 644 | create_resume_handler( resumption_handlers ); |
---|
| 645 | appendDeclStmt( block, resume_handler ); |
---|
| 646 | // Prepare hooks |
---|
[948b0c8] | 647 | inner = create_resume_wrapper( inner, resume_handler ); |
---|
[ba912706] | 648 | } |
---|
| 649 | |
---|
| 650 | if ( termination_handlers.size() ) { |
---|
| 651 | // Define the three helper functions. |
---|
| 652 | FunctionDecl * try_wrapper = create_try_wrapper( inner ); |
---|
| 653 | appendDeclStmt( block, try_wrapper ); |
---|
| 654 | FunctionDecl * terminate_catch = |
---|
| 655 | create_terminate_catch( termination_handlers ); |
---|
| 656 | appendDeclStmt( block, terminate_catch ); |
---|
| 657 | FunctionDecl * terminate_match = |
---|
| 658 | create_terminate_match( termination_handlers ); |
---|
| 659 | appendDeclStmt( block, terminate_match ); |
---|
| 660 | // Build the call to the try wrapper. |
---|
| 661 | inner = create_terminate_caller( |
---|
| 662 | try_wrapper, terminate_catch, terminate_match ); |
---|
| 663 | } |
---|
| 664 | |
---|
| 665 | // Embed the try block. |
---|
| 666 | block->push_back( inner ); |
---|
| 667 | |
---|
| 668 | return block; |
---|
| 669 | } |
---|
| 670 | |
---|
[7f9968a] | 671 | Statement * TryMutatorCore::postmutate( ThrowStmt *throwStmt ) { |
---|
| 672 | // Only valid `throwResume;` statements should remain. (2/3 checks) |
---|
| 673 | assert( ThrowStmt::Resume == throwStmt->kind && ! throwStmt->expr ); |
---|
| 674 | return create_resume_rethrow( throwStmt ); |
---|
| 675 | } |
---|
| 676 | |
---|
[046a890] | 677 | void translateThrows( std::list< Declaration *> & translationUnit ) { |
---|
| 678 | PassVisitor<ThrowMutatorCore> translator; |
---|
| 679 | mutateAll( translationUnit, translator ); |
---|
| 680 | } |
---|
| 681 | |
---|
| 682 | void translateTries( std::list< Declaration *> & translationUnit ) { |
---|
| 683 | PassVisitor<TryMutatorCore> translator; |
---|
[6fca7ea] | 684 | mutateAll( translationUnit, translator ); |
---|
[ba912706] | 685 | } |
---|
| 686 | } |
---|