94 lines
4.0 KiB
C++
94 lines
4.0 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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// 64-bit portability
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//---------------------------------------------------------------------------
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#include "check64bit.h"
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#include "symboldatabase.h"
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//---------------------------------------------------------------------------
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// Register this check class (by creating a static instance of it)
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namespace {
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Check64BitPortability instance;
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}
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/** Is given variable a pointer or array? */
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static bool isaddr(const Variable *var)
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{
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const Token *nametok = var ? var->nameToken() : 0;
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return (var && (nametok->strAt(-1) == "*" || nametok->strAt(1) == "["));
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}
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/** Is given variable an integer variable */
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static bool isint(const Variable *var)
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{
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return (var && Token::Match(var->nameToken()->previous(), "int|long|DWORD %var% !!["));
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}
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void Check64BitPortability::pointerassignment()
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{
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if (!_settings->isEnabled("portability"))
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return;
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
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if (Token::Match(tok, "[;{}] %var% = %var% [;+]")) {
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const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
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const Variable *var1(symbolDatabase->getVariableFromVarId(tok->next()->varId()));
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const Variable *var2(symbolDatabase->getVariableFromVarId(tok->tokAt(3)->varId()));
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if (isaddr(var1) && isint(var2) && tok->strAt(4) != "+")
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assignmentIntegerToAddressError(tok->next());
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else if (isint(var1) && isaddr(var2) && !tok->tokAt(3)->isPointerCompare()) {
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// assigning address => warning
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// some trivial addition => warning
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if (Token::Match(tok->tokAt(4), "+ %any% !!;"))
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continue;
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assignmentAddressToIntegerError(tok->next());
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}
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}
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}
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}
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void Check64BitPortability::assignmentAddressToIntegerError(const Token *tok)
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{
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reportError(tok, Severity::portability,
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"AssignmentAddressToInteger",
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"Assigning an address value to the integer (int/long/etc) type is not portable\n"
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"Assigning an address value to the integer (int/long/etc) type is not portable across different platforms and "
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"compilers. For example in 32-bit Windows and linux they are same width, but in 64-bit Windows and linux "
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"they are of different width. In worst case you end up assigning 64-bit address to 32-bit integer. The safe "
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"way is to always assign addresses only to pointer types (or typedefs).");
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}
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void Check64BitPortability::assignmentIntegerToAddressError(const Token *tok)
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{
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reportError(tok, Severity::portability,
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"AssignmentIntegerToAddress",
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"Assigning an integer (int/long/etc) to a pointer is not portable\n"
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"Assigning an integer (int/long/etc) to a pointer is not portable across different platforms and "
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"compilers. For example in 32-bit Windows and linux they are same width, but in 64-bit Windows and linux "
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"they are of different width. In worst case you end up assigning 32-bit integer to 64-bit pointer. The safe "
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"way is to always assign address to pointer.");
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}
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