Rewriting CheckMemoryLeak (Just Started)
This commit is contained in:
Daniel Marjamäki
parent
60e454fa11
commit
b6868b7f1a
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@ -2,7 +2,6 @@
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#include "CheckMemoryLeak.h"
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#include "tokenize.h"
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#include "Statements.h"
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#include "CommonCheck.h"
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@ -21,288 +20,100 @@ extern bool ShowAll;
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//---------------------------------------------------------------------------
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struct _variable
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static void CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char *varname[] )
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{
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int indentlevel;
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unsigned int varindex;
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enum {Any, Data, Malloc, New, NewA} value;
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int dealloc_level;
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};
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// Goto end of statement..
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const TOKEN *tok = Tok1;
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while (tok && tok->str[0] != ';')
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tok = tok->next;
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int indentlevel = 0;
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for ( ; tok; tok = tok->next )
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{
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if (tok->str[0]=='{')
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indentlevel++;
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else if (tok->str[0]=='}')
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{
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indentlevel--;
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if ( indentlevel < 0 )
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{
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std::ostringstream errmsg;
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errmsg << FileLine(Tok1) << ": Memory leak:" << varname[0];
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ReportErr( errmsg.str() );
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return;
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}
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}
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// Deallocated..
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if ( Match(tok, "delete %var1% ;", varname) )
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return;
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if ( Match(tok, "delete [ ] %var1% ;", varname) )
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return;
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if ( Match(tok, "free ( %var1% ) ;", varname) )
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return;
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if ( Match(tok, "kfree ( %var1% ) ;", varname) )
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return;
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// Used..
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if ( strchr("=,(", tok->str[0]) && Match( tok->next, "%var1%", varname ) )
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return;
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if ( Match( tok, "return %var1%", varname ) )
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return;
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}
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Checks for memory leaks inside function..
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//---------------------------------------------------------------------------
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static void _InFunction()
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static void CheckMemoryLeak_InFunction()
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{
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std::vector<_variable *> varlist;
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// if
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int iflevel = 0;
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bool endif = false;
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std::vector<bool> iflist;
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// loop
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int looplevel = 0;
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bool endloop = false;
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std::vector<bool> looplist;
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// switch
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int switchlevel = 0;
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bool endswitch = false;
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std::vector<bool> switchlist;
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// Parse the statement list and locate memory leaks..
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int indentlevel = 0;
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std::list<STATEMENT>::const_iterator it;
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for (it = Statements.begin(); it != Statements.end(); it++)
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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switch (it->Type)
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if (tok->str[0]=='{')
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indentlevel++;
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else if (tok->str[0]=='}')
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indentlevel--;
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else if (indentlevel > 0 && Match(tok, "%var% = "))
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{
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case STATEMENT::OBRACE:
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indentlevel++;
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iflist.push_back(endif);
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if (endif)
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iflevel++;
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looplist.push_back(endloop);
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if (endloop)
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looplevel++;
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switchlist.push_back(endswitch);
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if (endswitch)
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switchlevel++;
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break;
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// What we may have...
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// * var = (char *)malloc(10);
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// * var = new char[10];
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// * var = strdup("hello");
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const TOKEN *tok2 = gettok(tok, 2);
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if ( tok2 && tok2->str[0] == '(' )
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{
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while ( tok2 && tok2->str[0] != ')' )
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tok2 = tok2->next;
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tok2 = tok2 ? tok2->next : NULL;
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}
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if ( ! tok2 )
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continue;
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case STATEMENT::EBRACE:
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// Check if any variables go out of scope..
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if (indentlevel >= 1)
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// tok2 now points on "malloc", "new", "strdup" or something like that..
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const char *allocfunc[] = {"malloc", "strdup", "kmalloc", "new", 0};
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for ( unsigned int i = 0; allocfunc[i]; i++ )
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{
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if ( strcmp(allocfunc[i], tok2->str) == 0 )
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{
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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struct _variable *var = varlist[i];
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if (var->dealloc_level == indentlevel)
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var->dealloc_level = 0;
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if (var->indentlevel != indentlevel)
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continue;
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if (var->value == _variable::Malloc || var->value == _variable::New || var->value == _variable::NewA)
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Memory leak:" << VariableNames[varlist[i]->varindex];
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ReportErr(ostr.str());
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}
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// Delete this instance..
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delete varlist[i];
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varlist.erase(varlist.begin()+i);
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}
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}
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// if level..
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if ( ! iflist.empty() )
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{
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if (iflist.back())
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iflevel--;
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iflist.pop_back();
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}
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// loop level..
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if ( ! looplist.empty() )
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{
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if (looplist.back())
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looplevel--;
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looplist.pop_back();
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}
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// switch level..
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if ( ! switchlist.empty() )
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{
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if (switchlist.back())
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switchlevel--;
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switchlist.pop_back();
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}
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// Make sure the varlist is empty..
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if (indentlevel <= 1)
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varlist.clear();
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if (indentlevel > 0)
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indentlevel--;
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break;
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case STATEMENT::DECL:
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if (indentlevel > 0)
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{
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_variable *NewVar = new _variable;
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memset(NewVar, 0, sizeof(_variable));
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NewVar->indentlevel = indentlevel;
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NewVar->varindex = it->VarIndex;
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varlist.push_back(NewVar);
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}
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break;
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case STATEMENT::IF:
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case STATEMENT::ELSEIF:
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case STATEMENT::ELSE:
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// Conditional statements..
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iflevel++;
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break;
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case STATEMENT::ENDIF:
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iflevel--;
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break;
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// Not very interested in these..
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case STATEMENT::LOOP:
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case STATEMENT::ENDLOOP:
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case STATEMENT::SWITCH:
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case STATEMENT::ENDSWITCH:
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break;
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case STATEMENT::MALLOC:
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case STATEMENT::NEW:
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case STATEMENT::NEWARRAY:
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case STATEMENT::FREE:
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case STATEMENT::DELETE:
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case STATEMENT::DELETEARRAY:
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// Don't handle conditional allocation at the moment..
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if (iflevel>0 && (it->Type==STATEMENT::MALLOC || it->Type==STATEMENT::NEW || it->Type==STATEMENT::NEWARRAY))
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const char *varname[2] = {0,0};
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varname[0] = tok->str;
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CheckMemoryLeak_CheckScope(tok, varname);
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break;
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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if ( varlist[i]->varindex == it->VarIndex )
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{
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bool isalloc = (varlist[i]->value==_variable::Malloc || varlist[i]->value==_variable::New || varlist[i]->value==_variable::NewA);
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bool alloc = (it->Type==STATEMENT::MALLOC || it->Type==STATEMENT::NEW || it->Type==STATEMENT::NEWARRAY);
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// Already allocated and then allocated again..
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//bool err = (isalloc & alloc);
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if (isalloc && !alloc)
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{
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// Check that the deallocation matches..
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bool err = false;
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err |= (varlist[i]->value==_variable::Malloc && it->Type!=STATEMENT::FREE);
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err |= (varlist[i]->value==_variable::New && it->Type!=STATEMENT::DELETE);
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err |= (varlist[i]->value==_variable::NewA && it->Type!=STATEMENT::DELETEARRAY);
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Mismatching allocation and deallocation '" << VariableNames[varlist[i]->varindex] << "'";
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ReportErr(ostr.str());
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}
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}
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if ( it->Type == STATEMENT::MALLOC )
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varlist[i]->value = _variable::Malloc;
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else if ( it->Type == STATEMENT::NEW )
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varlist[i]->value = _variable::New;
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else if ( it->Type == STATEMENT::NEWARRAY )
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varlist[i]->value = _variable::NewA;
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else
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{
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// Deallocation...
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if (indentlevel > varlist[i]->indentlevel)
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varlist[i]->dealloc_level = indentlevel;
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else
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varlist[i]->value = _variable::Any;
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}
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break;
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}
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}
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break;
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case STATEMENT::ASSIGN:
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case STATEMENT::USE:
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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if ( varlist[i]->varindex == it->VarIndex )
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{
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varlist[i]->value = _variable::Data;
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break;
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}
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}
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break;
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case STATEMENT::RETURN:
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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struct _variable *var = varlist[i];
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if ( var->varindex == it->VarIndex )
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{
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var->value = _variable::Any;
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}
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else if (var->dealloc_level != indentlevel &&
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(var->value==_variable::New ||
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var->value==_variable::NewA ||
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var->value==_variable::Malloc ) )
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Memory leak:" << VariableNames[varlist[i]->varindex];
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ReportErr(ostr.str());
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var->value = _variable::Any;
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break;
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}
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}
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break;
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case STATEMENT::CONTINUE:
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case STATEMENT::BREAK:
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// Memory leak if variable is allocated..
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if (looplevel>0)
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{
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// Find the last loop..
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for (int i = looplist.size() - 1; i >= 0; i--)
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{
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if (switchlist[i])
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break;
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if (!looplist[i])
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continue;
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int loop_indentlevel = i + 1;
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for (i = 0; i < (int)varlist.size(); i++)
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{
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if (varlist[i]->indentlevel < loop_indentlevel)
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continue;
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if (varlist[i]->value==_variable::Malloc ||
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varlist[i]->value==_variable::New ||
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varlist[i]->value==_variable::NewA )
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Memory leak:" << VariableNames[varlist[i]->varindex];
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ReportErr(ostr.str());
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}
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break;
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}
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break;
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}
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}
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break;
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}
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}
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endif = (it->Type == STATEMENT::ENDIF);
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endloop = (it->Type == STATEMENT::ENDLOOP);
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endswitch = (it->Type == STATEMENT::ENDSWITCH);
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}
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}
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//---------------------------------------------------------------------------
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@ -310,188 +121,12 @@ static void _InFunction()
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//---------------------------------------------------------------------------
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// Check that all class members are deallocated..
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// Checks for memory leaks in classes..
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//---------------------------------------------------------------------------
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static void _ClassMembers_CheckVar(const char *classname, const char *varname)
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static void CheckMemoryLeak_ClassMembers()
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{
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// Check how the variable 'varname' is allocated..
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enum {No, New, NewA, Malloc} Alloc, Dealloc;
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Alloc = Dealloc = No;
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for (TOKEN *func = tokens; func; func = func->next)
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{
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if (strcmp(func->str, classname))
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continue;
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if (strcmp(getstr(func, 1), "::") != 0)
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continue;
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if ((strcmp(getstr(func,2),"~")==0 &&
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strcmp(getstr(func,3),classname)==0 &&
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strcmp(getstr(func,4),"(")==0) ||
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(strcmp(getstr(func, 3), "(") != 0))
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continue;
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int indentlevel = 0;
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for (TOKEN *tok = func; tok; tok = tok->next)
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{
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if (tok->str[0] == '{')
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{
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indentlevel++;
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}
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else if (tok->str[0] == '}')
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{
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indentlevel--;
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if (indentlevel == 0)
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{
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func = tok;
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break;
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}
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}
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else if (indentlevel==0 && tok->str[0] == ';')
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{
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func = tok;
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break;
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}
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else if (indentlevel > 0)
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{
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// Deallocation..
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if (strcmp(tok->str,"delete")==0 || strcmp(tok->str,"free")==0)
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{
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bool err = false;
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if (Match(tok, "delete %var% ;") &&
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strcmp(getstr(tok,1),varname)==0)
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{
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err |= ( Alloc != No && Alloc != New );
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Dealloc = New;
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}
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else if (Match(tok, "delete [ ] %var% ;") &&
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strcmp(getstr(tok,3),varname)==0)
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{
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err |= ( Alloc != No && Alloc != NewA );
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Dealloc = NewA;
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}
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else if (Match(tok, "free ( %var% )") &&
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strcmp(getstr(tok,2),varname)==0)
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{
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err |= ( Alloc != No && Alloc != Malloc );
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Dealloc = Malloc;
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}
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Mismatching deallocation for '" << classname << "::" << varname << "'";
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ReportErr(ostr.str());
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}
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}
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else
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{
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// Allocation...
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if ( strcmp(tok->str, varname) != 0 )
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continue;
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if ( strcmp(getstr(tok,1), "=") != 0 )
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continue;
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bool err = false;
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if ( strcmp(getstr(tok,2), "new") == 0 )
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{
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if ( Match(tok, "%var% = new %type% ;") ||
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Match(tok, "%var% = new %type% (") )
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{
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if ( ! ShowAll && ! IsStandardType(getstr(tok,3)) )
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continue;
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err |= ( Dealloc != No && Dealloc != New );
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Alloc = New;
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}
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else if ( Match(tok, "%var% = new %type% [") )
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{
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if ( ! ShowAll && ! IsStandardType(getstr(tok,3)) )
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continue;
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err |= ( Dealloc != No && Dealloc != NewA );
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Alloc = NewA;
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}
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}
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else if ( Match(tok, "%var% = strdup (") ||
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Match(tok, "%var% = ( %type% * ) malloc ("))
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{
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if ( ! ShowAll &&
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tok->next->next->str[0] == '(' &&
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! IsStandardType(getstr(tok,3)) )
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continue;
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err |= ( Dealloc != No && Dealloc != Malloc );
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Alloc = Malloc;
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}
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Mismatching allocation for '" << classname << "::" << varname << "'";
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ReportErr(ostr.str());
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}
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}
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}
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}
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}
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if ( Alloc != Dealloc && Dealloc == No )
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{
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std::ostringstream ostr;
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ostr << "Memory leak for '" << classname << "::" << varname << "'";
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ReportErr(ostr.str());
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}
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}
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static void _ClassMembers()
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{
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for (TOKEN *ClassDecl = tokens; ClassDecl; ClassDecl = ClassDecl->next)
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{
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// Is this a class declaration?
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// -------------------------------------
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if ( ! Match(ClassDecl, "class %var% {") )
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continue;
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const char *classname = getstr(ClassDecl, 1);
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// Locate member variables..
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int indentlevel = 0;
|
||||
for (TOKEN *ClassVar = ClassDecl; ClassVar; ClassVar = ClassVar->next)
|
||||
{
|
||||
if ( ClassVar->str[0] == '{' )
|
||||
indentlevel++;
|
||||
|
||||
else if ( ClassVar->str[0] == '}' )
|
||||
{
|
||||
indentlevel--;
|
||||
if (indentlevel == 0)
|
||||
break;
|
||||
}
|
||||
|
||||
else if (indentlevel == 1)
|
||||
{
|
||||
if ( Match(ClassVar, "%type% * %var% ;") )
|
||||
{
|
||||
const char *varname = getstr(ClassVar, 2);
|
||||
|
||||
// Check the variable usage..
|
||||
_ClassMembers_CheckVar(classname, varname);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -501,15 +136,11 @@ static void _ClassMembers()
|
|||
|
||||
void CheckMemoryLeak()
|
||||
{
|
||||
// Create statement list.
|
||||
Statements.clear();
|
||||
CreateStatementList();
|
||||
|
||||
// Check for memory leaks inside functions..
|
||||
_InFunction();
|
||||
CheckMemoryLeak_InFunction();
|
||||
|
||||
// Check that all class members are deallocated..
|
||||
_ClassMembers();
|
||||
CheckMemoryLeak_ClassMembers();
|
||||
}
|
||||
//---------------------------------------------------------------------------
|
||||
|
||||
|
|
|
|||
178
tests.cpp
178
tests.cpp
|
|
@ -4,7 +4,6 @@
|
|||
//---------------------------------------------------------------------------
|
||||
|
||||
#include "tokenize.h" // <- Tokenizer
|
||||
#include "Statements.h"
|
||||
#include "CommonCheck.h"
|
||||
|
||||
#include "CheckBufferOverrun.h"
|
||||
|
|
@ -22,7 +21,6 @@ bool Debug = false;
|
|||
//---------------------------------------------------------------------------
|
||||
static unsigned int FailCount, SuccessCount;
|
||||
//---------------------------------------------------------------------------
|
||||
static void internal_statementlist();
|
||||
static void buffer_overrun();
|
||||
static void constructors();
|
||||
static void operator_eq();
|
||||
|
|
@ -40,9 +38,6 @@ int main()
|
|||
// Don't filter out duplicate error messages..
|
||||
OnlyReportUniqueErrors = false;
|
||||
|
||||
// Check that the statement list is created correctly
|
||||
internal_statementlist();
|
||||
|
||||
// Check that buffer overruns are detected
|
||||
buffer_overrun();
|
||||
|
||||
|
|
@ -111,177 +106,6 @@ static void check(void (chk)(),
|
|||
}
|
||||
//---------------------------------------------------------------------------
|
||||
|
||||
static void statementlist()
|
||||
{
|
||||
CreateStatementList();
|
||||
OutputStatementList( errout );
|
||||
}
|
||||
|
||||
static void internal_statementlist()
|
||||
{
|
||||
const char code1[] = "void f()\n"
|
||||
"{\n"
|
||||
" a = 1;\n"
|
||||
" b[2] = 3;\n"
|
||||
" c[4][5].min = 6;\n"
|
||||
" d.min = 7;\n"
|
||||
"}\n";
|
||||
|
||||
const char sl1[] = "{\n"
|
||||
"assign a\n"
|
||||
"assign b[2]\n"
|
||||
"assign c[4][5].min\n"
|
||||
"assign d.min\n"
|
||||
"}\n";
|
||||
|
||||
check( statementlist, __LINE__, code1, sl1 );
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
const char code2[] = "void f()\n"
|
||||
"{\n"
|
||||
" int a;\n"
|
||||
" int b = 2, c, *d = NULL;\n"
|
||||
" int e = g(p1,p2);\n"
|
||||
" char str[10];\n"
|
||||
" return a;\n"
|
||||
" delete a;\n"
|
||||
"}\n";
|
||||
|
||||
const char sl2[] = "{\n"
|
||||
"decl a\n"
|
||||
"decl b\n"
|
||||
"assign b\n"
|
||||
"decl c\n"
|
||||
"decl d\n"
|
||||
"assign d\n"
|
||||
"use NULL\n"
|
||||
"decl e\n"
|
||||
"assign e\n"
|
||||
"use p1\n"
|
||||
"use p2\n"
|
||||
"decl str\n"
|
||||
"return a\n"
|
||||
"delete a\n"
|
||||
"}\n";
|
||||
|
||||
check( statementlist, __LINE__, code2, sl2 );
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
const char code3[] = "void f()\n"
|
||||
"{\n"
|
||||
" if (ab)\n"
|
||||
" {\n"
|
||||
" }\n"
|
||||
" else if (cd)\n"
|
||||
" {\n"
|
||||
" }\n"
|
||||
" else\n"
|
||||
" {\n"
|
||||
" }\n"
|
||||
"}\n";
|
||||
|
||||
const char sl3[] = "{\n"
|
||||
"if\n"
|
||||
"use ab\n"
|
||||
"endif\n"
|
||||
"{\n"
|
||||
"}\n"
|
||||
"elseif\n"
|
||||
"use cd\n"
|
||||
"endif\n"
|
||||
"{\n"
|
||||
"}\n"
|
||||
"else\n"
|
||||
"endif\n"
|
||||
"{\n"
|
||||
"}\n"
|
||||
"}\n";
|
||||
|
||||
check( statementlist, __LINE__, code3, sl3 );
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
const char code4[] = "void f()\n"
|
||||
"{\n"
|
||||
" for (int i = 0; i < j; i++)\n"
|
||||
" {\n"
|
||||
" if (condition)\n"
|
||||
" continue;\n"
|
||||
" break;\n"
|
||||
" }\n"
|
||||
"}\n";
|
||||
|
||||
const char sl4[] = "{\n"
|
||||
"loop\n"
|
||||
"assign i\n"
|
||||
"use i\n"
|
||||
"use i\n"
|
||||
"use j\n"
|
||||
"use i\n"
|
||||
"endloop\n"
|
||||
"{\n"
|
||||
"if\n"
|
||||
"use condition\n"
|
||||
"continue\n"
|
||||
"endif\n"
|
||||
"break\n"
|
||||
"}\n"
|
||||
"}\n";
|
||||
|
||||
check( statementlist, __LINE__, code4, sl4 );
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
const char code5[] = "void f()\n"
|
||||
"{\n"
|
||||
" a = new char[10];\n"
|
||||
" fred = new Fred;\n"
|
||||
" fred = new Fred();\n"
|
||||
"}\n";
|
||||
|
||||
const char sl5[] = "{\n"
|
||||
"new[] a\n"
|
||||
"use char[10]\n"
|
||||
"new fred\n"
|
||||
"use Fred\n"
|
||||
"new fred\n"
|
||||
"}\n";
|
||||
|
||||
check( statementlist, __LINE__, code5, sl5 );
|
||||
|
||||
|
||||
|
||||
const char code6[] = "void f()\n"
|
||||
"{\n"
|
||||
" a = b;\n"
|
||||
" c = func(d,e);\n"
|
||||
"}\n";
|
||||
|
||||
const char sl6[] = "{\n"
|
||||
"assign a\n"
|
||||
"use b\n"
|
||||
"assign c\n"
|
||||
"use d\n"
|
||||
"use e\n"
|
||||
"}\n";
|
||||
|
||||
check( statementlist, __LINE__, code6, sl6 );
|
||||
|
||||
}
|
||||
//---------------------------------------------------------------------------
|
||||
|
||||
static void buffer_overrun()
|
||||
{
|
||||
// test1: numeric array index
|
||||
|
|
@ -607,7 +431,7 @@ static void memleak_in_function()
|
|||
"{\n"
|
||||
" int *a = new int[10];\n"
|
||||
"}\n";
|
||||
check( CheckMemoryLeak, __LINE__, test1, "[test.cpp:4]: Memory leak:a\n" );
|
||||
check( CheckMemoryLeak, __LINE__, test1, "[test.cpp:3]: Memory leak:a\n" );
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue