812 lines
24 KiB
C++
812 lines
24 KiB
C++
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#include "CheckMemoryLeak.h"
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#include "tokenize.h"
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#include "CommonCheck.h"
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#include <stdlib.h> // free
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#include <vector>
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#include <sstream>
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#ifdef __BORLANDC__
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#include <mem.h> // <- memset
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#else
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#include <string.h>
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#endif
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#ifndef _MSC_VER
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#define _strdup(str) strdup(str)
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#endif
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//---------------------------------------------------------------------------
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static bool isclass( const std::string &typestr )
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{
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if ( typestr == "char" ||
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typestr == "short" ||
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typestr == "int" ||
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typestr == "long" ||
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typestr == "float" ||
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typestr == "double" )
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return false;
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std::ostringstream pattern;
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pattern << "struct " << typestr << " [;{]";
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if ( findmatch( tokens, pattern.str().c_str() ) )
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return false;
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return true;
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}
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//---------------------------------------------------------------------------
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enum AllocType { No, Malloc, New, NewA };
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// Extra allocation..
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class AllocFunc
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{
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public:
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const char *funcname;
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AllocType alloctype;
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AllocFunc(const char f[], AllocType a)
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{
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funcname = f;
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alloctype = a;
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}
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};
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static std::list<AllocFunc> listallocfunc;
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static AllocType GetAllocationType( const TOKEN *tok2 )
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{
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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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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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return No;
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// Does tok2 point on "malloc", "strdup" or "kmalloc"..
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const char *mallocfunc[] = {"malloc",
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"calloc",
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"realloc",
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"strdup",
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"kmalloc",
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"kzalloc",
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"g_malloc",
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0};
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for ( unsigned int i = 0; mallocfunc[i]; i++ )
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{
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if ( strcmp(mallocfunc[i], tok2->str) == 0 )
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return Malloc;
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}
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if ( Match( tok2, "new %type% [;(]" ) )
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return New;
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if ( Match( tok2, "new %type% [" ) )
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return NewA;
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// Userdefined allocation function..
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std::list<AllocFunc>::const_iterator it = listallocfunc.begin();
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while ( it != listallocfunc.end() )
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{
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if ( strcmp(tok2->str, it->funcname) == 0 )
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return it->alloctype;
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++it;
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}
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return No;
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}
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static AllocType GetDeallocationType( const TOKEN *tok, const char *varnames[] )
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{
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// Redundant condition..
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if ( Match(tok, "if ( %var1% )", varnames) )
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{
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tok = gettok( tok, 4 );
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if ( Match(tok,"{") )
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tok = tok->next;
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}
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if ( Match(tok, "delete %var1% ;", varnames) )
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return New;
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if ( Match(tok, "delete [ ] %var1% ;", varnames) )
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return NewA;
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if ( Match(tok, "free ( %var1% ) ;", varnames) ||
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Match(tok, "kfree ( %var1% ) ;", varnames) ||
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Match(tok, "g_free ( %var1% ) ;", varnames) )
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{
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return Malloc;
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}
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return No;
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}
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//---------------------------------------------------------------------------
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static void MismatchError( const TOKEN *Tok1, const char varname[] )
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{
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std::ostringstream errmsg;
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errmsg << FileLine(Tok1) << ": Mismatching allocation and deallocation: " << varname;
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ReportErr( errmsg.str() );
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}
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//---------------------------------------------------------------------------
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static void MemoryLeak( const TOKEN *tok, const char varname[] )
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{
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std::ostringstream errmsg;
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errmsg << FileLine(tok) << ": Memory leak: " << varname;
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ReportErr( errmsg.str() );
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}
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//---------------------------------------------------------------------------
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static void instoken(TOKEN *tok, const char str[])
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{
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TOKEN *newtok = new TOKEN;
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memcpy( newtok, tok, sizeof(TOKEN) );
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newtok->str = _strdup(str);
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tok->next = newtok;
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}
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//---------------------------------------------------------------------------
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extern bool ShowAll;
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/**
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* Extract a new tokens list that is easier to parse than the "tokens"
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* tok - start parse token
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* varname - name of variable
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*/
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static TOKEN *getcode(const TOKEN *tok, const char varname[])
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{
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const char *varnames[2];
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varnames[0] = varname;
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varnames[1] = 0;
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TOKEN *rethead = 0, *rettail = 0;
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#define addtoken(_str) \
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{ \
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TOKEN *newtok = new TOKEN; \
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newtok->str = _strdup(_str); \
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newtok->linenr = tok->linenr; \
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newtok->FileIndex = tok->FileIndex; \
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newtok->next = 0; \
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if (rettail) \
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rettail->next = newtok; \
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else \
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rethead = newtok; \
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rettail=newtok; \
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}
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AllocType alloctype = No;
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AllocType dealloctype = No;
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int indentlevel = 0;
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int parlevel = 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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{
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addtoken( "{" );
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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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addtoken( "}" );
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if ( indentlevel <= 0 )
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break;
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indentlevel--;
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}
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if ( tok->str[0] == '(' )
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parlevel++;
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else if ( tok->str[0] == ')' )
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parlevel--;
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if ( parlevel == 0 && tok->str[0]==';')
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addtoken(";");
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if (Match(tok, "[(;{}] %var1% =", varnames))
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{
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AllocType alloc = GetAllocationType(gettok(tok,3));
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// If "--all" hasn't been given, don't check classes..
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if ( alloc == New && ! ShowAll )
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{
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if ( Match(gettok(tok,3), "new %type% [(;]") )
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{
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if ( isclass( getstr(tok, 4) ) )
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alloc = No;
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}
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}
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if ( alloc != No )
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{
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addtoken("alloc");
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if (alloctype!=No && alloctype!=alloc)
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MismatchError(tok, varname);
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if (dealloctype!=No && dealloctype!=alloc)
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MismatchError(tok, varname);
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alloctype = alloc;
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}
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}
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AllocType dealloc = GetDeallocationType(tok, varnames);
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if ( dealloc != No )
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{
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addtoken("dealloc");
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if (alloctype!=No && alloctype!=dealloc)
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MismatchError(tok, varname);
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if (dealloctype!=No && dealloctype!=dealloc)
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MismatchError(tok, varname);
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dealloctype = dealloc;
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}
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// if else switch
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if ( Match(tok, "if ( %var1% )", varnames) ||
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Match(tok, "if ( %var1% != NULL )", varnames) )
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{
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addtoken("if(var)");
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tok = gettok(tok, 3); // Make sure the "use" will not be added
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}
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else if ( Match(tok, "if ( ! %var1% )", varnames) ||
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Match(tok, "if ( unlikely ( ! %var1% ) )", varnames) ||
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Match(tok, "if ( unlikely ( %var1% == NULL ) )", varnames) ||
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Match(tok, "if ( %var1% == NULL )", varnames) ||
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Match(tok, "if ( NULL == %var1% )", varnames) ||
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Match(tok, "if ( %var1% == 0 )", varnames) )
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{
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addtoken("if(!var)");
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}
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else if ( Match(tok, "if") ||
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Match(tok, "else") ||
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Match(tok, "switch") )
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{
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addtoken(tok->str);
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}
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if ( Match(tok, "case") )
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{
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addtoken("case");
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addtoken(";");
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}
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if ( Match(tok, "default") )
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{
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addtoken("case");
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addtoken(";");
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}
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// Loops..
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if (Match(tok, "for") || Match(tok, "while") || Match(tok, "do") )
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addtoken("loop");
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// continue / break..
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if ( Match(tok, "continue") )
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addtoken("continue");
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if ( Match(tok, "break") )
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addtoken("break");
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// goto..
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if ( Match(tok, "goto") )
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addtoken( "goto" );
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// Return..
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if ( Match(tok, "return") )
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{
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addtoken("return");
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if ( Match(tok, "return %var1%", varnames) ||
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Match(tok, "return & %var1%", varnames) )
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addtoken("use");
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}
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// Assignment..
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if ( Match(tok,"[)=] %var1%", varnames) )
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addtoken("use");
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// Function parameter..
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if ( Match(tok, "[(,] %var1% [,)]", varnames) )
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addtoken("use");
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// Linux lists..
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if ( Match( tok, "[=(,] & %var1% [.[]", varnames ) )
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addtoken("use");
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}
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return rethead;
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}
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static void erase(TOKEN *begin, const TOKEN *end)
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{
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if ( ! begin )
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return;
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while ( begin->next && begin->next != end )
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{
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TOKEN *next = begin->next;
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begin->next = begin->next->next;
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free(next->str);
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delete next;
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}
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}
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// Simpler but less powerful than "CheckMemoryLeak_CheckScope_All"
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static void CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char varname[] )
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{
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TOKEN *tok = getcode( Tok1, varname );
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// If the variable is not allocated at all => no memory leak
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if (findmatch(tok, "alloc") == 0)
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{
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deleteTokens(tok);
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return;
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}
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// reduce the code..
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bool done = false;
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while ( ! done )
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{
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done = true;
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for (TOKEN *tok2 = tok ; tok2; tok2 = tok2->next )
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{
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// Delete extra ";"
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while (Match(tok2,"[;{}] ;"))
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{
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erase(tok2, gettok(tok2,2));
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done = false;
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}
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// Replace "{ }" with ";"
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if ( Match(tok2->next, "{ }") )
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{
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tok2->next->str[0] = ';';
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erase(tok2->next, gettok(tok2,3));
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done = false;
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}
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// Delete braces around a single instruction..
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if ( Match(tok2->next, "{ %var% ; }") )
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{
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erase( tok2, gettok(tok2,2) );
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erase( tok2->next->next, gettok(tok2,4) );
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done = false;
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}
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if ( Match(tok2->next, "{ return use ; }") )
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{
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erase( tok2, gettok(tok2,2) );
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erase( tok2->next->next->next, gettok(tok2,5) );
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done = false;
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}
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// Delete empty if that is not followed by an else
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if ( Match(tok2,"[;{}] if ;") ||
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Match(tok2,"[;{}] if(var) ;") ||
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Match(tok2,"[;{}] if(!var) ;") )
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{
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if ( ! Match(gettok(tok2,3), "else") )
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{
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erase(tok2, gettok(tok2, 3));
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done = false;
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continue;
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}
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}
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// Delete if block: "alloc; if return use ;"
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if (Match(tok2,"alloc ; if return use ;") && !Match(gettok(tok2,6),"else"))
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{
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erase(tok2, gettok(tok2,5));
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done = false;
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}
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// "[;{}] if alloc ; else return ;" => "[;{}] alloc ;"
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if (Match(tok2,"[;{}] if alloc ; else return ;"))
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{
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erase(tok2, gettok(tok2,2)); // Remove "if"
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erase(tok2->next, gettok(tok2,5)); // Remove "; else return"
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done = false;
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}
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// Replace "dealloc use ;" with "dealloc ;"
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if ( Match(tok2, "dealloc use ;") )
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{
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erase(tok2, gettok(tok2,2));
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done = false;
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}
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// Reducing if..
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if (Match(tok2,"if dealloc ; else") || Match(tok2,"if use ; else"))
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{
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erase(tok2, gettok(tok2, 2));
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done = false;
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}
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if (Match(tok2,"[;{}] if { dealloc ; return ; }") && !Match(gettok(tok2,8),"else"))
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{
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erase(tok2,gettok(tok2,8));
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done = false;
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}
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// Delete "loop ;"
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if ( Match(tok2->next, "loop ;") )
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{
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erase(tok2, gettok(tok2,3));
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done = false;
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}
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// Delete if block in "alloc ; if(!var) return ;"
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if ( Match(tok2, "alloc ; if(!var) return ;") )
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{
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erase(tok2, gettok(tok2,4));
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done = false;
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}
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// Delete second use in "use ; use ;"
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while (Match(tok2, "use ; use ;"))
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{
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erase(tok2, gettok(tok2,3));
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done = false;
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}
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// Delete second case in "case ; case ;"
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while (Match(tok2, "case ; case ;"))
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{
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erase(tok2, gettok(tok2,3));
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done = false;
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}
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// Replace switch with if (if not complicated)
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if (Match(tok2, "switch {"))
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{
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// Right now, I just handle if there are a few case and perhaps a default.
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bool valid = false;
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bool incase = false;
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for ( const TOKEN * _tok = gettok(tok2,2); _tok; _tok = _tok->next )
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{
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if ( _tok->str[0] == '{' )
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break;
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else if ( _tok->str[0] == '}' )
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{
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valid = true;
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break;
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}
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else if (strncmp(_tok->str,"if",2)==0)
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break;
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else if (strcmp(_tok->str,"switch")==0)
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break;
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else if (strcmp(_tok->str,"loop")==0)
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break;
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else if (incase && Match(_tok,"case"))
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break;
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incase |= Match(_tok,"case");
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incase &= !Match(_tok,"break");
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}
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if ( !incase && valid )
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{
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done = false;
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free(tok2->str);
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tok2->str = _strdup(";");
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erase( tok2, gettok(tok2, 2) );
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tok2 = tok2->next;
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bool first = true;
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while (Match(tok2,"case") || Match(tok2,"default"))
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{
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bool def = Match(tok2, "default");
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free(tok2->str);
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tok2->str = _strdup(first ? "if" : "}");
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if ( first )
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{
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first = false;
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instoken( tok2, "{" );
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}
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else
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{
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// Insert "else [if] {
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instoken( tok2, "{" );
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if ( ! def )
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instoken( tok2, "if" );
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instoken( tok2, "else" );
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}
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while ( tok2 && tok2->str[0] != '}' && ! Match(tok2,"break ;") )
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tok2 = tok2->next;
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if (Match(tok2,"break ;"))
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{
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free(tok2->str);
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tok2->str = _strdup(";");
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tok2 = tok2->next->next;
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}
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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 ( findmatch(tok, "loop alloc ;") )
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{
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MemoryLeak(findmatch(tok, "loop alloc ;"), varname);
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}
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else if ( findmatch(tok, "alloc ; if continue ;") )
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{
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MemoryLeak(gettok(findmatch(tok, "alloc ; if continue ;"), 3), varname);
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}
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else if ( findmatch(tok, "alloc ; if return ;") )
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{
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MemoryLeak(gettok(findmatch(tok, "alloc ; if return ;"), 3), varname);
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}
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else if ( findmatch(tok, "alloc ; return ;") )
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{
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MemoryLeak(gettok(findmatch(tok,"alloc ; return ;"),2), varname);
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}
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else if ( ! findmatch(tok,"dealloc") &&
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! findmatch(tok,"use") &&
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! findmatch(tok,"return use ;") )
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{
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const TOKEN *last = tok;
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while (last->next)
|
|
last = last->next;
|
|
MemoryLeak(last, varname);
|
|
}
|
|
|
|
deleteTokens(tok);
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checks for memory leaks inside function..
|
|
//---------------------------------------------------------------------------
|
|
|
|
static void CheckMemoryLeak_InFunction()
|
|
{
|
|
bool infunc = false;
|
|
int indentlevel = 0;
|
|
for (const TOKEN *tok = tokens; tok; tok = tok->next)
|
|
{
|
|
if (tok->str[0]=='{')
|
|
indentlevel++;
|
|
|
|
else if (tok->str[0]=='}')
|
|
indentlevel--;
|
|
|
|
|
|
// In function..
|
|
if ( indentlevel == 0 )
|
|
{
|
|
if ( Match(tok, ") {") )
|
|
infunc = true;
|
|
|
|
if ( Match(tok, "[;}]") )
|
|
infunc = false;
|
|
}
|
|
|
|
// Declare a local variable => Check
|
|
if (indentlevel>0 && infunc)
|
|
{
|
|
if ( Match(tok, "[{};] %type% * %var% [;=]") )
|
|
CheckMemoryLeak_CheckScope( tok->next, getstr(tok, 3) );
|
|
|
|
else if ( Match(tok, "[{};] %type% %type% * %var% [;=]") )
|
|
CheckMemoryLeak_CheckScope( tok->next, getstr(tok, 4) );
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checks for memory leaks in classes..
|
|
//---------------------------------------------------------------------------
|
|
|
|
static void CheckMemoryLeak_ClassMembers_ParseClass( const TOKEN *tok1, std::vector<const char *> &classname );
|
|
static void CheckMemoryLeak_ClassMembers_Variable( const std::vector<const char *> &classname, const char varname[] );
|
|
|
|
|
|
static void CheckMemoryLeak_ClassMembers()
|
|
{
|
|
int indentlevel = 0;
|
|
for ( const TOKEN *tok = tokens; tok; tok = tok->next )
|
|
{
|
|
if ( tok->str[0] == '{' )
|
|
indentlevel++;
|
|
|
|
else if ( tok->str[0] == '}' )
|
|
indentlevel--;
|
|
|
|
else if ( indentlevel == 0 && Match(tok, "class %var% [{:]") )
|
|
{
|
|
std::vector<const char *> classname;
|
|
classname.push_back( getstr(tok, 1) );
|
|
CheckMemoryLeak_ClassMembers_ParseClass( tok, classname );
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void CheckMemoryLeak_ClassMembers_ParseClass( const TOKEN *tok1, std::vector<const char *> &classname )
|
|
{
|
|
// Go into class.
|
|
while ( tok1 && tok1->str[0] != '{' )
|
|
tok1 = tok1->next;
|
|
if ( tok1 )
|
|
tok1 = tok1->next;
|
|
|
|
int indentlevel = 0;
|
|
for ( const TOKEN *tok = tok1; tok; tok = tok->next )
|
|
{
|
|
if ( tok->str[0] == '{' )
|
|
indentlevel++;
|
|
|
|
else if ( tok->str[0] == '}' )
|
|
{
|
|
indentlevel--;
|
|
if ( indentlevel < 0 )
|
|
return;
|
|
}
|
|
|
|
// Only parse this particular class.. not subclasses
|
|
if ( indentlevel > 0 )
|
|
continue;
|
|
|
|
// Declaring subclass.. recursive checking
|
|
if ( Match(tok, "class %var% [{:]") )
|
|
{
|
|
classname.push_back( getstr(tok, 1) );
|
|
CheckMemoryLeak_ClassMembers_ParseClass( tok, classname );
|
|
classname.pop_back();
|
|
}
|
|
|
|
// Declaring member variable.. check allocations and deallocations
|
|
if ( Match(tok->next, "%type% * %var% ;") )
|
|
{
|
|
if ( IsName(tok->str) || strchr(";}", tok->str[0]) )
|
|
{
|
|
if (ShowAll || !isclass(getstr(tok,1)))
|
|
CheckMemoryLeak_ClassMembers_Variable( classname, getstr(tok, 3) );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void CheckMemoryLeak_ClassMembers_Variable( const std::vector<const char *> &classname, const char varname[] )
|
|
{
|
|
// Function pattern.. Check if member function
|
|
std::ostringstream fpattern;
|
|
for ( unsigned int i = 0; i < classname.size(); i++ )
|
|
{
|
|
fpattern << classname[i] << " :: ";
|
|
}
|
|
fpattern << "%var% (";
|
|
|
|
// Destructor pattern.. Check if class destructor..
|
|
std::ostringstream destructor;
|
|
for ( unsigned int i = 0; i < classname.size(); i++ )
|
|
{
|
|
destructor << classname[i] << " :: ";
|
|
}
|
|
destructor << " ~" << classname.back() << " (";
|
|
|
|
// Pattern used in member function. "Var = ..."
|
|
std::ostringstream varname_eq;
|
|
varname_eq << varname << " =";
|
|
|
|
// Full variable name..
|
|
std::ostringstream FullVariableName;
|
|
for ( unsigned int i = 0; i < classname.size(); i++ )
|
|
FullVariableName << classname[i] << "::";
|
|
FullVariableName << varname;
|
|
|
|
// Check if member variable has been allocated and deallocated..
|
|
AllocType Alloc = No;
|
|
AllocType Dealloc = No;
|
|
|
|
// Loop through all tokens. Inspect member functions
|
|
bool memberfunction = false;
|
|
int indentlevel = 0;
|
|
for ( const TOKEN *tok = tokens; tok; tok = tok->next )
|
|
{
|
|
if ( tok->str[0] == '{' )
|
|
indentlevel++;
|
|
|
|
else if ( tok->str[0] == '}' )
|
|
indentlevel--;
|
|
|
|
// Set the 'memberfunction' variable..
|
|
if ( indentlevel == 0 )
|
|
{
|
|
if ( strchr(";}", tok->str[0]) )
|
|
memberfunction = false;
|
|
else if ( Match( tok, fpattern.str().c_str() ) || Match( tok, destructor.str().c_str() ) )
|
|
memberfunction = true;
|
|
}
|
|
|
|
// Parse member function..
|
|
if ( indentlevel > 0 && memberfunction )
|
|
{
|
|
// Allocate..
|
|
if ( Match( tok, varname_eq.str().c_str() ) )
|
|
{
|
|
AllocType alloc = GetAllocationType( gettok( tok, 2 ) );
|
|
if ( alloc != No )
|
|
{
|
|
if ( Dealloc != No && Dealloc != alloc )
|
|
MismatchError( tok, FullVariableName.str().c_str() );
|
|
if ( Alloc != No && Alloc != alloc )
|
|
MismatchError( tok, FullVariableName.str().c_str() );
|
|
Alloc = alloc;
|
|
}
|
|
}
|
|
|
|
// Deallocate..
|
|
const char *varnames[2] = { "var", 0 };
|
|
varnames[0] = varname;
|
|
AllocType dealloc = GetDeallocationType( tok, varnames );
|
|
if ( dealloc != No )
|
|
{
|
|
if ( Dealloc != No && Dealloc != dealloc )
|
|
MismatchError( tok, FullVariableName.str().c_str() );
|
|
if ( Alloc != No && Alloc != dealloc )
|
|
MismatchError( tok, FullVariableName.str().c_str() );
|
|
Dealloc = dealloc;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( Alloc != No && Dealloc == No )
|
|
{
|
|
MemoryLeak( tokens, FullVariableName.str().c_str() );
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Checks for memory leaks..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckMemoryLeak()
|
|
{
|
|
listallocfunc.clear();
|
|
|
|
// Check for memory leaks inside functions..
|
|
CheckMemoryLeak_InFunction();
|
|
|
|
// Check that all class members are deallocated..
|
|
CheckMemoryLeak_ClassMembers();
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|