798 lines
25 KiB
C++
798 lines
25 KiB
C++
//---------------------------------------------------------------------------
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#include "CheckOther.h"
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#include "tokenize.h"
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#include "CommonCheck.h"
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#include <list>
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#include <sstream>
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#include <stdlib.h> // <- atoi
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Warning on C-Style casts.. p = (kalle *)foo;
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//---------------------------------------------------------------------------
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void WarningOldStylePointerCast()
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{
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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// Old style pointer casting..
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if (!Match(tok, "( %type% * ) %var%"))
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continue;
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// Is "type" a class?
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const char *pattern[] = {"class","",NULL};
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pattern[1] = getstr(tok, 1);
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if (!findtoken(tokens, pattern))
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continue;
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": C-style pointer casting";
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ReportErr(ostr.str());
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}
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}
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//---------------------------------------------------------------------------
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// Use standard function "isdigit" instead
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//---------------------------------------------------------------------------
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void WarningIsDigit()
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{
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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bool err = false;
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err |= Match(tok, "%var% >= '0' && %var% <= '9'");
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err |= Match(tok, "* %var% >= '0' && * %var% <= '9'");
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err |= Match(tok, "( %var% >= '0' ) && ( %var% <= '9' )");
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err |= Match(tok, "( * %var% >= '0' ) && ( * %var% <= '9' )");
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": The condition can be simplified; use 'isdigit'";
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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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// Use standard function "isalpha" instead
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//---------------------------------------------------------------------------
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void WarningIsAlpha()
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{
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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bool err = false;
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if ( tok->str[0] != '(' )
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continue;
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err |= Match(tok, "( %var% >= 'A' && %var% <= 'Z' ) || ( %var% >= 'a' && %var% <= 'z' )");
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err |= Match(tok, "( %var% >= 'a' && %var% <= 'z' ) || ( %var% >= 'A' && %var% <= 'Z' )");
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err |= Match(tok, "( * %var% >= 'A' && * %var% <= 'Z' ) || ( * %var% >= 'a' && * %var% <= 'z' )");
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err |= Match(tok, "( * %var% >= 'a' && * %var% <= 'z' ) || ( * %var% >= 'A' && * %var% <= 'Z' )");
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err |= Match(tok, "( ( %var% >= 'A' ) && ( %var% <= 'Z' ) ) || ( ( %var% >= 'a' ) && ( %var% <= 'z' ) )");
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err |= Match(tok, "( ( %var% >= 'a' ) && ( %var% <= 'z' ) ) || ( ( %var% >= 'A' ) && ( %var% <= 'Z' ) )");
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err |= Match(tok, "( ( * %var% >= 'A' ) && ( * %var% <= 'Z' ) ) || ( ( * var >= 'a' ) && ( * %var% <= 'z' ) )");
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err |= Match(tok, "( ( * %var% >= 'a' ) && ( * %var% <= 'z' ) ) || ( ( * var >= 'A' ) && ( * %var% <= 'Z' ) )");
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": The condition can be simplified; use 'isalpha'";
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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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// Redundant code..
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//---------------------------------------------------------------------------
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void WarningRedundantCode()
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{
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// if (p) delete p
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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if (strcmp(tok->str,"if"))
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continue;
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const char *varname1 = NULL;
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const TOKEN *tok2 = NULL;
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if (Match(tok,"if ( %var% )"))
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{
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varname1 = getstr(tok, 2);
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tok2 = gettok(tok, 4);
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}
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else if (Match(tok,"if ( %var% != NULL )"))
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{
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varname1 = getstr(tok, 2);
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tok2 = gettok(tok, 6);
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}
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if (varname1==NULL || tok2==NULL)
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continue;
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bool err = false;
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if (Match(tok2,"delete %var% ;"))
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err = (strcmp(getstr(tok2,1),varname1)==0);
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else if (Match(tok2,"{ delete %var% ; }"))
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err = (strcmp(getstr(tok2,2),varname1)==0);
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else if (Match(tok2,"delete [ ] %var% ;"))
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err = (strcmp(getstr(tok2,1),varname1)==0);
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else if (Match(tok2,"{ delete [ ] %var% ; }"))
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err = (strcmp(getstr(tok2,2),varname1)==0);
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else if (Match(tok2,"free ( %var% )"))
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err = (strcmp(getstr(tok2,2),varname1)==0);
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else if (Match(tok2,"{ free ( %var% ) ; }"))
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err = (strcmp(getstr(tok2,3),varname1)==0);
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Redundant condition. It is safe to deallocate a NULL pointer";
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ReportErr(ostr.str());
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}
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}
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// TODO: Redundant condition
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// if (haystack.find(needle) != haystack.end())
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// haystack.remove(needle);
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// if (condition) ....
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//---------------------------------------------------------------------------
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void WarningIf()
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{
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// Search for 'if (condition);'
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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if (strcmp(tok->str,"if")==0)
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{
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int parlevel = 0;
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for (const TOKEN *tok2 = tok->next; tok2; tok2 = tok2->next)
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{
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if (tok2->str[0]=='(')
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parlevel++;
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else if (tok2->str[0]==')')
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{
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parlevel--;
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if (parlevel<=0)
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{
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if (strcmp(getstr(tok2,1), ";") == 0 &&
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strcmp(getstr(tok2,2), "else") != 0)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Found \"if (condition);\"";
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ReportErr(ostr.str());
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}
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break;
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}
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}
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}
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}
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}
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// Search for 'a=b; if (a==b)'
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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// Begin statement?
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if ( ! strchr(";{}", tok->str[0]) )
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continue;
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tok = tok->next;
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if ( ! tok )
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break;
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if (!Match(tok,"%var% = %var% ; if ( %var%"))
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continue;
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if ( strcmp(getstr(tok, 9), ")") != 0 )
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continue;
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// var1 = var2 ; if ( var3 cond var4 )
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const char *var1 = tok->str;
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const char *var2 = getstr(tok, 2);
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const char *var3 = getstr(tok, 6);
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const char *cond = getstr(tok, 7);
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const char *var4 = getstr(tok, 8);
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// Check that var3 is equal with either var1 or var2
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if (strcmp(var1,var3) && strcmp(var2,var3))
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continue;
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// Check that var4 is equal with either var1 or var2
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if (strcmp(var1,var4) && strcmp(var2,var4))
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continue;
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// Check that there is a condition..
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const char *p[6] = {"==","<=",">=","!=","<",">"};
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bool iscond = false;
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for (int i = 0; i < 6; i++)
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iscond |= (strcmp(cond, p[i]) == 0);
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if (!iscond)
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break;
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// we found the error. Report.
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std::ostringstream ostr;
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ostr << FileLine(gettok(tok,4)) << ": The condition is always ";
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for (int i = 0; i < 6; i++)
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{
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if (strcmp(cond, p[i]) == 0)
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ostr << (i < 3 ? "True" : "False");
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}
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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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// strtol(str, 0, radix) <- radix must be 0 or 2-36
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//---------------------------------------------------------------------------
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void InvalidFunctionUsage()
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{
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for ( const TOKEN *tok = tokens; tok; tok = tok->next )
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{
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if ( strcmp(tok->str, "strtol") && strcmp(tok->str, "strtoul") )
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continue;
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// Locate the third parameter of the function call..
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int parlevel = 0;
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int param = 1;
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for ( const TOKEN *tok2 = tok->next; tok2; tok2 = tok2->next )
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{
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if ( tok2->str[0] == '(' )
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parlevel++;
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else if (tok2->str[0] == ')')
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parlevel--;
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else if (parlevel == 1 && tok2->str[0] == ',')
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{
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param++;
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if (param==3)
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{
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if ( Match(tok2, ", %num% )") )
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{
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int radix = atoi(tok2->next->str);
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if (!(radix==0 || (radix>=2 && radix<=36)))
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{
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std::ostringstream ostr;
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ostr << FileLine(tok2) << ": Invalid radix in call to strtol or strtoul. Must be 0 or 2-36";
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ReportErr(ostr.str());
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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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}
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}
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Dangerous usage of 'strtok'
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//---------------------------------------------------------------------------
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static const TOKEN *GetFunction( const TOKEN *content )
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{
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const TOKEN *func = NULL;
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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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{
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indentlevel--;
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if (indentlevel == 0)
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func = NULL;
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}
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else if (indentlevel == 0)
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{
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if (tok->str[0] == ';')
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func = NULL;
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else if ( Match(tok, "%var% :: %var% (") )
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func = tok->next->next;
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else if ( Match(tok, "%type% %var% (") )
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func = tok->next;
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}
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else if (indentlevel>0 && func)
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{
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if ( tok == content )
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return func;
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}
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}
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return NULL;
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}
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void WarningStrTok()
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{
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std::list<const TOKEN *> funclist;
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// Which functions contain the 'strtok'?
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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if (strcmp(tok->str,"strtok")!=0)
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continue;
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const TOKEN *func = GetFunction(tok);
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if (!func)
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continue;
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funclist.push_back( func );
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}
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// No functions in list => No errors
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if ( funclist.empty() )
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return;
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// Take closer look at the strtok usage.
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std::list<const TOKEN *>::const_iterator it1;
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for (it1 = funclist.begin(); it1 != funclist.end(); it1++)
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{
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// Search this function to check that it doesn't call any other of
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// the functions in the funclist.
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int indentlevel = 0;
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for ( const TOKEN *tok = *it1; 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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if ( indentlevel <= 1 )
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break;
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indentlevel--;
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}
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else if ( indentlevel >= 1 )
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{
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// Only interested in function calls..
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if (!(IsName(tok->str) && strcmp(getstr(tok,1), "(") == 0))
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continue;
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// Check if function name is in funclist..
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std::list<const TOKEN *>::const_iterator it2;
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for (it2 = funclist.begin(); it2 != funclist.end(); it2++)
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{
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if ( strcmp( tok->str, (*it2)->str ) )
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continue;
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Possible bug. Both '" << (*it1)->str << "' and '" << (*it2)->str << "' uses strtok.";
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ReportErr(ostr.str());
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break;
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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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//---------------------------------------------------------------------------
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// Assignment in condition
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//---------------------------------------------------------------------------
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void CheckIfAssignment()
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{
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for (const TOKEN *tok = tokens; tok; tok = tok->next)
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{
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if (Match(tok, "if ( %var% = %num% )") ||
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Match(tok, "if ( %var% = %str% )") ||
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Match(tok, "if ( %var% = %var% )") )
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Possible bug. Should it be '==' instead of '='?";
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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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// Check for case without break
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//---------------------------------------------------------------------------
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void CheckCaseWithoutBreak()
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{
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for ( const TOKEN *tok = tokens; tok; tok = tok->next )
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{
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if ( strcmp(tok->str,"case")!=0 )
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continue;
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// Found a case, check that there's a break..
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int indentlevel = 0;
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for (const TOKEN *tok2 = tok->next; tok2; tok2 = tok2->next)
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{
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if (tok2->str[0] == '{')
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indentlevel++;
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else if (tok2->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 ostr;
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ostr << FileLine(tok) << ": 'case' without 'break'.";
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ReportErr(ostr.str());
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}
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}
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if (indentlevel==0)
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{
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if (strcmp(tok2->str,"break")==0)
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break;
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if (strcmp(tok2->str,"return")==0)
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break;
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if (strcmp(tok2->str,"case")==0)
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{
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std::ostringstream ostr;
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ostr << FileLine(tok) << ": Found 'case' without 'break'.";
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ReportErr(ostr.str());
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break;
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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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//---------------------------------------------------------------------------
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// Check for unsigned divisions
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//---------------------------------------------------------------------------
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void CheckUnsignedDivision()
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{
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// Check for "ivar / uvar" and "uvar / ivar"
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// Todo: Much better checking for declared variables
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const char *div_pattern[] = {"", "/", "", NULL};
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for (const TOKEN *div_tok = findtoken(tokens, div_pattern); div_tok; div_tok = findtoken(div_tok->next, div_pattern))
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{
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const char *varname1 = div_tok->str;
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const char *varname2 = div_tok->next->next->str;
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if ( IsName(varname1) && IsName(varname2) )
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{
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char var1_sign=0, var2_sign=0;
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// Check if any of the variables are unsigned..
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const char *pattern_declvar[] = { "unsigned", "", "", NULL };
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pattern_declvar[2] = varname1;
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if ( findtoken(tokens, pattern_declvar) )
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var1_sign = 'u';
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pattern_declvar[2] = varname2;
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if ( findtoken(tokens, pattern_declvar) )
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var2_sign = 'u';
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if (var1_sign == var2_sign)
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continue;
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// Check if any of the variables are signed..
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pattern_declvar[0] = ";";
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pattern_declvar[1] = "int";
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pattern_declvar[2] = varname1;
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if ( findtoken(tokens, pattern_declvar) )
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var1_sign = 's';
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pattern_declvar[2] = varname2;
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if ( findtoken(tokens, pattern_declvar) )
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var2_sign = 's';
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pattern_declvar[0] = "{";
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pattern_declvar[2] = varname1;
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if ( findtoken(tokens, pattern_declvar) )
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var1_sign = 's';
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pattern_declvar[2] = varname2;
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if ( findtoken(tokens, pattern_declvar) )
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var2_sign = 's';
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if ( var1_sign && var2_sign && var1_sign != var2_sign )
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{
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// One of the operands are signed, the other is unsigned..
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std::ostringstream ostr;
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ostr << FileLine(div_tok) << ": If the result is negative it will be wrong because an operand is unsigned.";
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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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//---------------------------------------------------------------------------
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// Check scope of variables..
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//---------------------------------------------------------------------------
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static void CheckVariableScope_LookupVar( const TOKEN *tok1, const char varname[] );
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void CheckVariableScope()
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{
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// Walk through all tokens..
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bool func = 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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|
// Skip class and struct declarations..
|
|
if ( strcmp(tok->str, "class") == 0 || strcmp(tok->str, "struct") == 0 )
|
|
{
|
|
for (const TOKEN *tok2 = tok; tok2; tok2 = tok2->next)
|
|
{
|
|
if ( tok2->str[0] == '{' )
|
|
{
|
|
int _indentlevel = 0;
|
|
tok = tok2;
|
|
for (tok = tok2; tok; tok = tok->next)
|
|
{
|
|
if ( tok->str[0] == '{' )
|
|
{
|
|
_indentlevel++;
|
|
}
|
|
if ( tok->str[0] == '}' )
|
|
{
|
|
_indentlevel--;
|
|
if ( _indentlevel <= 0 )
|
|
{
|
|
tok = tok->next;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
if (strchr(",);", tok2->str[0]))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
if ( ! tok )
|
|
break;
|
|
}
|
|
|
|
if ( tok->str[0] == '{' )
|
|
{
|
|
indentlevel++;
|
|
}
|
|
if ( tok->str[0] == '}' )
|
|
{
|
|
indentlevel--;
|
|
if ( indentlevel == 0 )
|
|
func = false;
|
|
}
|
|
if ( indentlevel == 0 && Match(tok, ") {") )
|
|
{
|
|
func = true;
|
|
}
|
|
if ( indentlevel > 0 && func && strchr("{};", tok->str[0]) )
|
|
{
|
|
// First token of statement..
|
|
const TOKEN *tok1 = tok->next;
|
|
if ( ! tok1 )
|
|
continue;
|
|
|
|
if (strcmp(tok1->str,"return")==0 ||
|
|
strcmp(tok1->str,"delete")==0 ||
|
|
strcmp(tok1->str,"else")==0)
|
|
continue;
|
|
|
|
// Variable declaration?
|
|
if (Match(tok1, "%var% %var% ;") ||
|
|
Match(tok1, "%var% %var% =") )
|
|
{
|
|
CheckVariableScope_LookupVar( tok1, getstr(tok1, 1) );
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
static void CheckVariableScope_LookupVar( const TOKEN *tok1, const char varname[] )
|
|
{
|
|
const TOKEN *tok = tok1;
|
|
|
|
// Skip the variable declaration..
|
|
while ( tok->str[0] != ';' )
|
|
tok = tok->next;
|
|
|
|
// Check if the variable is used in this indentlevel..
|
|
bool used = false, used1 = false;
|
|
int indentlevel = 0;
|
|
int parlevel = 0;
|
|
bool for_or_while = false;
|
|
while ( indentlevel >= 0 && tok )
|
|
{
|
|
if ( tok->str[0] == '{' )
|
|
{
|
|
indentlevel++;
|
|
}
|
|
|
|
else if ( tok->str[0] == '}' )
|
|
{
|
|
indentlevel--;
|
|
if ( indentlevel == 0 )
|
|
{
|
|
if ( for_or_while && used )
|
|
return;
|
|
used1 = used;
|
|
used = false;
|
|
}
|
|
}
|
|
|
|
else if ( tok->str[0] == '(' )
|
|
{
|
|
parlevel++;
|
|
}
|
|
|
|
else if ( tok->str[0] == ')' )
|
|
{
|
|
parlevel--;
|
|
}
|
|
|
|
|
|
else if ( strcmp(tok->str, varname) == 0 )
|
|
{
|
|
if ( indentlevel == 0 || used1 )
|
|
return;
|
|
used = true;
|
|
}
|
|
|
|
else if ( indentlevel==0 )
|
|
{
|
|
if ( strcmp(tok->str,"for")==0 || strcmp(tok->str,"while")==0 )
|
|
for_or_while = true;
|
|
if ( parlevel == 0 && tok->str[0] == ';' )
|
|
for_or_while = false;
|
|
}
|
|
|
|
tok = tok->next;
|
|
}
|
|
|
|
// Warning if "used" is true
|
|
std::ostringstream errmsg;
|
|
errmsg << FileLine(tok1) << " The scope of the variable '" << varname << "' can be limited";
|
|
ReportErr( errmsg.str() );
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check for constant function parameters
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckConstantFunctionParameter()
|
|
{
|
|
for (const TOKEN *tok = tokens; tok; tok = tok->next)
|
|
{
|
|
if ( Match(tok,"[,(] const std :: %type% %var% [,)]") )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << FileLine(tok) << " " << getstr(tok,5) << " is passed by value, it could be passed by reference/pointer instead";
|
|
ReportErr( errmsg.str() );
|
|
}
|
|
|
|
else if ( Match(tok,"[,(] const %type% %var% [,)]") )
|
|
{
|
|
// Check if type is a struct or class.
|
|
const char *pattern[3] = {"class","type",0};
|
|
pattern[1] = getstr(tok, 2);
|
|
if ( findtoken(tokens, pattern) )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << FileLine(tok) << " " << getstr(tok,3) << " is passed by value, it could be passed by reference/pointer instead";
|
|
ReportErr( errmsg.str() );
|
|
}
|
|
pattern[0] = "struct";
|
|
if ( findtoken(tokens, pattern) )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << FileLine(tok) << " " << getstr(tok,3) << " is passed by value, it could be passed by reference/pointer instead";
|
|
ReportErr( errmsg.str() );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check that all struct members are used
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckStructMemberUsage()
|
|
{
|
|
const char *structname = 0;
|
|
|
|
for ( const TOKEN *tok = tokens; tok; tok = tok->next )
|
|
{
|
|
if ( tok->FileIndex != 0 )
|
|
continue;
|
|
if ( tok->str[0] == '}' )
|
|
structname = 0;
|
|
if ( Match(tok, "struct %type% {") )
|
|
structname = getstr(tok, 1);
|
|
|
|
if (structname && Match(tok, "[{;]"))
|
|
{
|
|
const char *varname = 0;
|
|
if (Match(tok->next, "%type% %var% [;[]"))
|
|
varname = getstr( tok, 2 );
|
|
else if (Match(tok->next, "%type% %type% %var% [;[]"))
|
|
varname = getstr( tok, 2 );
|
|
else if (Match(tok->next, "%type% * %var% [;[]"))
|
|
varname = getstr( tok, 3 );
|
|
else if (Match(tok->next, "%type% %type% * %var% [;[]"))
|
|
varname = getstr( tok, 4 );
|
|
else
|
|
continue;
|
|
|
|
const char *varnames[2];
|
|
varnames[0] = varname;
|
|
varnames[1] = 0;
|
|
bool used = false;
|
|
for ( const TOKEN *tok2 = tokens; tok2; tok2 = tok2->next )
|
|
{
|
|
if ( tok->FileIndex != 0 )
|
|
continue;
|
|
|
|
if (Match(tok2, ". %var%", varnames))
|
|
{
|
|
if ( strcmp("=", getstr(tok2,2)) == 0 )
|
|
continue;
|
|
used = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( ! used )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << FileLine(tok) << ": struct member '" << structname << "::" << varname << "' is never read";
|
|
ReportErr(errmsg.str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|