Re-adding CheckMemoryLeak functionality. More work is still needed.
This commit is contained in:
Daniel Marjamäki
parent
0bd9f3a8fa
commit
fd9ca7c300
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@ -20,30 +20,81 @@ extern bool ShowAll;
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//---------------------------------------------------------------------------
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static void MismatchError( const TOKEN *Tok1, const char *varname[] )
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enum AllocType { No, Malloc, New, NewA };
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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", "strdup", "kmalloc", 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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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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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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{
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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[0];
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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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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[0];
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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 CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char *varname[] )
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static void CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char varname[] )
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{
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int varc = 1;
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while ( varname[varc] )
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varc++;
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varc = (varc - 1) * 2;
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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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enum {No, Malloc, New, NewA} Alloc = No;
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AllocType Alloc = No;
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int alloc_indentlevel = 0;
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@ -67,9 +118,9 @@ static void CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char *varname[]
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}
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// Skip stuff like: if (!var) ...
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if ( Match(tok, "if ( ! %var1% )", varname) ||
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Match(tok, "if ( %var1% == NULL )", varname) ||
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Match(tok, "if ( %var1% == 0 )", varname) )
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if ( Match(tok, "if ( ! %var1% )", varnames) ||
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Match(tok, "if ( %var1% == NULL )", varnames) ||
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Match(tok, "if ( %var1% == 0 )", varnames) )
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{
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int _indentlevel = 0;
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while ( tok )
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@ -89,74 +140,30 @@ static void CheckMemoryLeak_CheckScope( const TOKEN *Tok1, const char *varname[]
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}
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// Allocated..
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if ( Match(tok, "%var1% =", varname) )
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if ( Match(tok, "%var1% =", varnames) )
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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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const TOKEN *tok2 = gettok(tok, varc+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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// Does tok2 point on "malloc", "strdup" or "kmalloc"..
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const char *mallocfunc[] = {"malloc", "strdup", "kmalloc", 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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{
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Alloc = Malloc;
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alloc_indentlevel = indentlevel;
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break;
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}
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}
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if ( Match( tok2, "new %type% [;(]" ) )
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AllocType alloc = GetAllocationType( gettok(tok, 2) );
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if ( alloc != No )
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{
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Alloc = alloc;
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alloc_indentlevel = indentlevel;
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Alloc = New;
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}
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if ( Match( tok2, "new %type% [" ) )
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{
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alloc_indentlevel = indentlevel;
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Alloc = NewA;
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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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AllocType dealloc = GetDeallocationType( tok, varnames );
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if ( dealloc != No )
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{
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if ( Alloc != No && Alloc != New )
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MismatchError( Tok1, varname );
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return;
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}
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if ( Match(tok, "delete [ ] %var1% ;", varname) )
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{
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if ( Alloc != No && Alloc != NewA )
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MismatchError( Tok1, varname );
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return;
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}
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if ( Match(tok, "free ( %var1% ) ;", varname) || Match(tok, "kfree ( %var1% ) ;", varname) )
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{
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if ( Alloc != No && Alloc != Malloc )
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if ( Alloc != No && Alloc != dealloc )
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MismatchError( Tok1, varname );
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return;
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}
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// Used..
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if ( Match( tok, "[=,(] %var1%", varname ) )
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if ( Match( tok, "[=,(] %var1%", varnames ) )
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return;
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if ( Match( tok, "return %var1%", varname ) )
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if ( Match( tok, "return %var1%", varnames ) )
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return;
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if ( Alloc != No && alloc_indentlevel >= 0 && Match(tok, "return") )
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@ -201,18 +208,10 @@ static void CheckMemoryLeak_InFunction()
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if (indentlevel>0 && infunc)
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{
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if ( Match(tok, "[{};] %type% * %var% [;=]") )
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{
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const char *varname[2] = {0,0};
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varname[0] = getstr(tok, 3);
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CheckMemoryLeak_CheckScope( tok->next, varname );
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}
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CheckMemoryLeak_CheckScope( tok->next, getstr(tok, 3) );
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if ( Match(tok, "[{};] %type% %type% * %var% [;=]") )
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{
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const char *varname[2] = {0,0};
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varname[0] = getstr(tok, 4);
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CheckMemoryLeak_CheckScope( tok->next, varname );
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}
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else if ( Match(tok, "[{};] %type% %type% * %var% [;=]") )
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CheckMemoryLeak_CheckScope( tok->next, getstr(tok, 4) );
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}
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}
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}
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@ -225,6 +224,8 @@ static void CheckMemoryLeak_InFunction()
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//---------------------------------------------------------------------------
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static void CheckMemoryLeak_ClassMembers_ParseClass( const TOKEN *tok1, std::vector<const char *> &classname );
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static void CheckMemoryLeak_ClassMembers_Variable( const std::vector<const char *> &classname, const char varname[] );
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static void CheckMemoryLeak_ClassMembers()
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{
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@ -246,6 +247,7 @@ static void CheckMemoryLeak_ClassMembers()
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}
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}
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static void CheckMemoryLeak_ClassMembers_ParseClass( const TOKEN *tok1, std::vector<const char *> &classname )
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{
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// Go into class.
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@ -267,37 +269,119 @@ static void CheckMemoryLeak_ClassMembers_ParseClass( const TOKEN *tok1, std::vec
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return;
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}
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else if ( indentlevel == 0 && Match(tok, "class %var% [{:]") )
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// Only parse this particular class.. not subclasses
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if ( indentlevel > 0 )
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continue;
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// Declaring subclass.. recursive checking
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if ( Match(tok, "class %var% [{:]") )
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{
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classname.push_back( getstr(tok, 1) );
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CheckMemoryLeak_ClassMembers_ParseClass( tok, classname );
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classname.pop_back();
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}
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else if ( indentlevel == 1 && Match(tok, "[:;] %type% * %var% ;") )
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// Declaring member variable.. check allocations and deallocations
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if ( Match(tok->next, "%type% * %var% ;") )
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{
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const char *func_pattern[] = {"classname", "::", "", "("};
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func_pattern[0] = classname.back();
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for ( const TOKEN *ftok = findtoken(tokens, func_pattern);
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ftok;
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ftok = findtoken(ftok->next, func_pattern) )
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if ( IsName(tok->str) || strchr(";}", tok->str[0]) )
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CheckMemoryLeak_ClassMembers_Variable( classname, getstr(tok, 3) );
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}
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}
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}
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static void CheckMemoryLeak_ClassMembers_Variable( const std::vector<const char *> &classname, const char varname[] )
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{
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// Function pattern.. Check if member function
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char fpattern[500] = {0};
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for ( unsigned int i = 0; i < classname.size(); i++ )
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{
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strcat( fpattern, classname[i] );
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strcat( fpattern, " :: " );
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}
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strcat( fpattern, "%var% (" );
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// Destructor pattern.. Check if class destructor..
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char destructor[500] = {0};
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for ( unsigned int i = 0; i < classname.size(); i++ )
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{
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strcat( destructor, classname[i] );
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strcat( destructor, " :: " );
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}
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strcat( destructor, " ~" );
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strcat( destructor, classname.back() );
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strcat( destructor, " (" );
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// Pattern used in member function. "Var = ..."
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std::ostringstream varname_eq;
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varname_eq << varname << " =";
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// Full variable name..
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std::ostringstream FullVariableName;
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for ( unsigned int i = 0; i < classname.size(); i++ )
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FullVariableName << classname[i] << "::";
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FullVariableName << varname;
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// Check if member variable has been allocated and deallocated..
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AllocType Alloc = No;
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AllocType Dealloc = No;
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// Loop through all tokens. Inspect member functions
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bool memberfunction = false;
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int indentlevel = 0;
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for ( const TOKEN *tok = tokens; 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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indentlevel--;
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// Set the 'memberfunction' variable..
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if ( indentlevel == 0 )
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{
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if ( strchr(";}", tok->str[0]) )
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memberfunction = false;
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else if ( Match( tok, fpattern ) || Match( tok, destructor ) )
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memberfunction = true;
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}
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// Parse member function..
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if ( indentlevel > 0 && memberfunction )
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{
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// Allocate..
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if ( Match( tok, varname_eq.str().c_str() ) )
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{
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for ( const TOKEN *tok2 = ftok; tok2; tok2 = tok2->next )
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AllocType alloc = GetAllocationType( gettok( tok, 2 ) );
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if ( alloc != No )
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{
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if ( tok->str[0] == ';' )
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break;
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if ( tok->str[0] == '{' )
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{
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classname.push_back( getstr(tok, 3) );
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classname.push_back( 0 );
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// Todo check the function..
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classname.pop_back();
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classname.pop_back();
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}
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if ( Dealloc != No && Dealloc != alloc )
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MismatchError( tok, FullVariableName.str().c_str() );
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if ( Alloc != No && Alloc != alloc )
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MismatchError( tok, FullVariableName.str().c_str() );
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Alloc = alloc;
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}
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}
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// Deallocate..
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const char *varnames[2] = { "var", 0 };
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varnames[0] = varname;
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AllocType dealloc = GetDeallocationType( tok, varnames );
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if ( dealloc != No )
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{
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if ( Dealloc != No && Dealloc != dealloc )
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MismatchError( tok, FullVariableName.str().c_str() );
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if ( Alloc != No && Alloc != dealloc )
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MismatchError( tok, FullVariableName.str().c_str() );
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Dealloc = dealloc;
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}
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}
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}
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if ( Alloc != No && Dealloc == No )
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{
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MemoryLeak( tokens, FullVariableName.str().c_str() );
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}
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}
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@ -548,7 +548,6 @@ static void memleak_in_function()
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const char test10[] = "static void f()\n"
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"{\n"
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" struct acpi_object_list *obj_list;\n"
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@ -562,7 +561,6 @@ static void memleak_in_function()
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static void memleak_in_class()
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{
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const char test1[] = "class Fred\n"
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"{\n"
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"private:\n"
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@ -584,7 +582,7 @@ static void memleak_in_class()
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" delete [] str2;\n"
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"}\n";
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check( CheckMemoryLeak, __LINE__, test1, "Memory leak for 'Fred::str1'\n" );
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check( CheckMemoryLeak, __LINE__, test1, "[test.cpp:1]: Memory leak: Fred::str1\n" );
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@ -608,11 +606,12 @@ static void memleak_in_class()
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" free(str1);\n"
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"}\n";
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check( CheckMemoryLeak, __LINE__, test2, "[test.cpp:17]: Mismatching deallocation for 'Fred::str1'\n" );
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check( CheckMemoryLeak, __LINE__, test2, "[test.cpp:17]: Mismatching allocation and deallocation: Fred::str1\n" );
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/* TODO
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const char test3[] = "class Fred\n"
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"{\n"
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"private:\n"
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@ -639,7 +638,7 @@ static void memleak_in_class()
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"}\n";
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check( CheckMemoryLeak, __LINE__, test3, "Memory leak for 'Fred::str'\n" );
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*/
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}
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