293 lines
11 KiB
C++
293 lines
11 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2014 Daniel Marjamäki and Cppcheck team.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
//---------------------------------------------------------------------------
|
|
#include "checkexceptionsafety.h"
|
|
#include "symboldatabase.h"
|
|
#include "token.h"
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
// Register CheckExceptionSafety..
|
|
namespace {
|
|
CheckExceptionSafety instance;
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckExceptionSafety::destructors()
|
|
{
|
|
const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
// Perform check..
|
|
const std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
const Function * j = scope->function;
|
|
if (j) {
|
|
// only looking for destructors
|
|
if (j->type == Function::eDestructor) {
|
|
// Inspect this destructor..
|
|
for (const Token *tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
|
|
// Skip try blocks
|
|
if (Token::simpleMatch(tok, "try {")) {
|
|
tok = tok->next()->link();
|
|
}
|
|
|
|
// throw found within a destructor
|
|
if (tok->str() == "throw") {
|
|
destructorsError(tok);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
void CheckExceptionSafety::deallocThrow()
|
|
{
|
|
if (!_settings->isEnabled("warning"))
|
|
return;
|
|
|
|
const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
// Deallocate a global/member pointer and then throw exception
|
|
// the pointer will be a dead pointer
|
|
const std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
for (const Token *tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
|
|
// only looking for delete now
|
|
if (tok->str() != "delete")
|
|
continue;
|
|
|
|
// Check if this is something similar with: "delete p;"
|
|
tok = tok->next();
|
|
if (Token::simpleMatch(tok, "[ ]"))
|
|
tok = tok->tokAt(2);
|
|
if (!tok)
|
|
break;
|
|
if (!Token::Match(tok, "%var% ;"))
|
|
continue;
|
|
|
|
// we only look for global variables
|
|
const Variable *var = tok->variable();
|
|
if (!var || !(var->isGlobal() || var->isStatic()))
|
|
continue;
|
|
|
|
const unsigned int varid(tok->varId());
|
|
|
|
// Token where throw occurs
|
|
const Token *ThrowToken = nullptr;
|
|
|
|
// is there a throw after the deallocation?
|
|
const Token* const end2 = tok->scope()->classEnd;
|
|
for (const Token *tok2 = tok; tok2 != end2; tok2 = tok2->next()) {
|
|
// Throw after delete -> Dead pointer
|
|
if (tok2->str() == "throw") {
|
|
if (_settings->inconclusive) { // For inconclusive checking, throw directly.
|
|
deallocThrowError(tok2, tok->str());
|
|
break;
|
|
}
|
|
ThrowToken = tok2;
|
|
}
|
|
|
|
// Variable is assigned -> Bail out
|
|
else if (Token::Match(tok2, "%varid% =", varid)) {
|
|
if (ThrowToken) // For non-inconclusive checking, wait until we find an assignment to it. Otherwise we assume it is safe to leave a dead pointer.
|
|
deallocThrowError(ThrowToken, tok2->str());
|
|
break;
|
|
}
|
|
// Variable passed to function. Assume it becomes assigned -> Bail out
|
|
else if (Token::Match(tok2, "[,(] &| %varid% [,)]", varid)) // TODO: No bailout if passed by value or as const reference
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// catch(const exception & err)
|
|
// {
|
|
// throw err; // <- should be just "throw;"
|
|
// }
|
|
//---------------------------------------------------------------------------
|
|
void CheckExceptionSafety::checkRethrowCopy()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
for (std::list<Scope>::const_iterator i = symbolDatabase->scopeList.begin(); i != symbolDatabase->scopeList.end(); ++i) {
|
|
if (i->type != Scope::eCatch)
|
|
continue;
|
|
|
|
const unsigned int varid = i->classStart->tokAt(-2)->varId();
|
|
if (varid) {
|
|
for (const Token* tok = i->classStart->next(); tok && tok != i->classEnd; tok = tok->next()) {
|
|
if (Token::simpleMatch(tok, "catch (") && tok->next()->link() && tok->next()->link()->next()) // Don't check inner catch - it is handled in another iteration of outer loop.
|
|
tok = tok->next()->link()->next()->link();
|
|
else if (Token::Match(tok, "throw %varid% ;", varid))
|
|
rethrowCopyError(tok, tok->strAt(1));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// try {} catch (std::exception err) {} <- Should be "std::exception& err"
|
|
//---------------------------------------------------------------------------
|
|
void CheckExceptionSafety::checkCatchExceptionByValue()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
for (std::list<Scope>::const_iterator i = symbolDatabase->scopeList.begin(); i != symbolDatabase->scopeList.end(); ++i) {
|
|
if (i->type != Scope::eCatch)
|
|
continue;
|
|
|
|
// Find a pass-by-value declaration in the catch(), excluding basic types
|
|
// e.g. catch (std::exception err)
|
|
const Variable *var = i->classStart->tokAt(-2)->variable();
|
|
if (var && var->isClass() && !var->isPointer() && !var->isReference())
|
|
catchExceptionByValueError(i->classDef);
|
|
}
|
|
}
|
|
|
|
|
|
static const Token * functionThrowsRecursive(const Function * function, std::set<const Function *> & recursive)
|
|
{
|
|
// check for recursion and bail if found
|
|
if (!recursive.insert(function).second)
|
|
return nullptr;
|
|
|
|
if (!function->functionScope)
|
|
return nullptr;
|
|
|
|
for (const Token *tok = function->functionScope->classStart->next();
|
|
tok != function->functionScope->classEnd; tok = tok->next()) {
|
|
if (tok->str() == "try") {
|
|
// just bail for now
|
|
break;
|
|
}
|
|
if (tok->str() == "throw") {
|
|
return tok;
|
|
} else if (tok->function()) {
|
|
const Function * called = tok->function();
|
|
// check if called function has an exception specification
|
|
if (called->isThrow && called->throwArg) {
|
|
return tok;
|
|
} else if (called->isNoExcept && called->noexceptArg &&
|
|
called->noexceptArg->str() != "true") {
|
|
return tok;
|
|
} else if (functionThrowsRecursive(called, recursive)) {
|
|
return tok;
|
|
}
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
static const Token * functionThrows(const Function * function)
|
|
{
|
|
std::set<const Function *> recursive;
|
|
|
|
return functionThrowsRecursive(function, recursive);
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// void func() noexcept { throw x; }
|
|
// void func() throw() { throw x; }
|
|
// void func() __attribute__((nothrow)); void func() { throw x; }
|
|
//--------------------------------------------------------------------------
|
|
void CheckExceptionSafety::nothrowThrows()
|
|
{
|
|
const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
const std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
|
|
// check noexcept functions
|
|
if (scope->function && scope->function->isNoExcept &&
|
|
(!scope->function->noexceptArg || scope->function->noexceptArg->str() == "true")) {
|
|
const Token *throws = functionThrows(scope->function);
|
|
if (throws)
|
|
noexceptThrowError(throws);
|
|
}
|
|
|
|
// check throw() functions
|
|
else if (scope->function && scope->function->isThrow && !scope->function->throwArg) {
|
|
const Token *throws = functionThrows(scope->function);
|
|
if (throws)
|
|
nothrowThrowError(throws);
|
|
}
|
|
|
|
// check __attribute__((nothrow)) functions
|
|
else if (scope->function && scope->function->isAttributeNothrow()) {
|
|
const Token *throws = functionThrows(scope->function);
|
|
if (throws)
|
|
nothrowAttributeThrowError(throws);
|
|
}
|
|
}
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// void func() { functionWithExceptionSpecification(); }
|
|
//--------------------------------------------------------------------------
|
|
void CheckExceptionSafety::unhandledExceptionSpecification()
|
|
{
|
|
if (!_settings->isEnabled("warning"))
|
|
return;
|
|
|
|
const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
const std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
// only check functions without exception epecification
|
|
if (scope->function && !scope->function->isThrow &&
|
|
scope->className != "main" && scope->className != "wmain" &&
|
|
scope->className != "_tmain" && scope->className != "WinMain") {
|
|
for (const Token *tok = scope->function->functionScope->classStart->next();
|
|
tok != scope->function->functionScope->classEnd; tok = tok->next()) {
|
|
if (tok->str() == "try") {
|
|
break;
|
|
} else if (tok->function()) {
|
|
const Function * called = tok->function();
|
|
// check if called function has an exception specification
|
|
if (called->isThrow && called->throwArg) {
|
|
unhandledExceptionSpecificationError(tok, called->tokenDef, scope->function->name());
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|