288 lines
9.9 KiB
C++
288 lines
9.9 KiB
C++
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#include "CheckMemoryLeak.h"
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#include "Statements.h"
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#include "CommonCheck.h"
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#include <vector>
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#include <sstream>
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#include <mem.h> // <- memset
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//---------------------------------------------------------------------------
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struct _variable
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{
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int indentlevel;
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unsigned int varindex;
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enum {Any, Data, Malloc, New, NewA} value;
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};
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//---------------------------------------------------------------------------
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void CheckMemoryLeak()
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{
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std::vector<_variable *> varlist;
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// if
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int iflevel = 0;
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bool endif = false;
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std::vector<bool> iflist;
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// loop
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int looplevel = 0;
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bool endloop = false;
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std::vector<bool> looplist;
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// switch
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int switchlevel = 0;
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bool endswitch = false;
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std::vector<bool> switchlist;
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// Parse the statement list and locate memory leaks..
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int indentlevel = 0;
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std::list<STATEMENT>::const_iterator it;
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for (it = Statements.begin(); it != Statements.end(); it++)
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{
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switch (it->Type)
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{
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case STATEMENT::OBRACE:
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indentlevel++;
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iflist.push_back(endif);
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if (endif)
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iflevel++;
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looplist.push_back(endloop);
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if (endloop)
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looplevel++;
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switchlist.push_back(endswitch);
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if (endswitch)
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switchlevel++;
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break;
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case STATEMENT::EBRACE:
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// Check if any variables go out of scope..
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if (indentlevel >= 1)
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{
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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if (varlist[i]->indentlevel != indentlevel)
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continue;
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if (varlist[i]->value == _variable::Malloc || varlist[i]->value == _variable::New || varlist[i]->value == _variable::NewA)
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Memory leak:" << VariableNames[varlist[i]->varindex];
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ReportErr(ostr.str());
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}
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// Delete this instance..
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delete varlist[i];
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varlist.erase(varlist.begin()+i);
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}
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}
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// if level..
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if ( ! iflist.empty() )
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{
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if (iflist.back())
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iflevel--;
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iflist.pop_back();
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}
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// loop level..
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if ( ! looplist.empty() )
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{
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if (looplist.back())
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looplevel--;
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looplist.pop_back();
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}
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// switch level..
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if ( ! switchlist.empty() )
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{
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if (switchlist.back())
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switchlevel--;
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switchlist.pop_back();
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}
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// Make sure the varlist is empty..
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if (indentlevel <= 1)
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varlist.clear();
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if (indentlevel > 0)
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indentlevel--;
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break;
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case STATEMENT::DECL:
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if (indentlevel > 0)
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{
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_variable *NewVar = new _variable;
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memset(NewVar, 0, sizeof(_variable));
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NewVar->indentlevel = indentlevel;
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NewVar->varindex = it->VarIndex;
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varlist.push_back(NewVar);
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}
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break;
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case STATEMENT::IF:
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case STATEMENT::ELSEIF:
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case STATEMENT::ELSE:
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// Conditional statements..
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iflevel++;
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break;
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case STATEMENT::ENDIF:
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iflevel--;
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break;
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// Not very interested in these..
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case STATEMENT::LOOP:
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case STATEMENT::ENDLOOP:
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case STATEMENT::SWITCH:
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case STATEMENT::ENDSWITCH:
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break;
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case STATEMENT::MALLOC:
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case STATEMENT::NEW:
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case STATEMENT::NEWARRAY:
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case STATEMENT::FREE:
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case STATEMENT::DELETE:
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case STATEMENT::DELETEARRAY:
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// Don't handle conditional allocation at the moment..
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if (iflevel>0 && (it->Type==STATEMENT::MALLOC || it->Type==STATEMENT::NEW || it->Type==STATEMENT::NEWARRAY))
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break;
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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if ( varlist[i]->varindex == it->VarIndex )
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{
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bool isalloc = (varlist[i]->value==_variable::Malloc || varlist[i]->value==_variable::New || varlist[i]->value==_variable::NewA);
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bool alloc = (it->Type==STATEMENT::MALLOC || it->Type==STATEMENT::NEW || it->Type==STATEMENT::NEWARRAY);
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// Already allocated and then allocated again..
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//bool err = (isalloc & alloc);
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if (isalloc && !alloc)
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{
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// Check that the deallocation matches..
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bool err = false;
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err |= (varlist[i]->value==_variable::Malloc && it->Type!=STATEMENT::FREE);
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err |= (varlist[i]->value==_variable::New && it->Type!=STATEMENT::DELETE);
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err |= (varlist[i]->value==_variable::NewA && it->Type!=STATEMENT::DELETEARRAY);
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if (err)
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Mismatching allocation and deallocation '" << VariableNames[varlist[i]->varindex] << "'";
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ReportErr(ostr.str());
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}
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}
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if ( it->Type == STATEMENT::MALLOC )
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varlist[i]->value = _variable::Malloc;
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else if ( it->Type == STATEMENT::FREE )
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varlist[i]->value = _variable::Any;
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else if ( it->Type == STATEMENT::NEW )
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varlist[i]->value = _variable::New;
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else if ( it->Type == STATEMENT::NEWARRAY )
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varlist[i]->value = _variable::NewA;
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else if ( it->Type == STATEMENT::DELETE )
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varlist[i]->value = _variable::Any;
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else if ( it->Type == STATEMENT::DELETEARRAY )
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varlist[i]->value = _variable::Any;
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break;
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}
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}
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break;
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case STATEMENT::ASSIGN:
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case STATEMENT::USE:
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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if ( varlist[i]->varindex == it->VarIndex )
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{
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varlist[i]->value = _variable::Data;
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break;
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}
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}
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break;
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case STATEMENT::RETURN:
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for (unsigned int i = 0; i < varlist.size(); i++)
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{
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if ( varlist[i]->varindex == it->VarIndex )
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{
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varlist[i]->value = _variable::Any;
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}
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else if (varlist[i]->value==_variable::New ||
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varlist[i]->value==_variable::NewA )
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Memory leak:" << VariableNames[varlist[i]->varindex];
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ReportErr(ostr.str());
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varlist[i]->value = _variable::Any;
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break;
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}
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}
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break;
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case STATEMENT::CONTINUE:
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case STATEMENT::BREAK:
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// Memory leak if variable is allocated..
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if (looplevel>0)
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{
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// Find the last loop..
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for (int i = looplist.size() - 1; i >= 0; i--)
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{
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if (switchlist[i])
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break;
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if (!looplist[i])
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continue;
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int loop_indentlevel = i + 1;
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for (i = 0; i < (int)varlist.size(); i++)
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{
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if (varlist[i]->indentlevel < loop_indentlevel)
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continue;
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if (varlist[i]->value==_variable::Malloc ||
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varlist[i]->value==_variable::New ||
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varlist[i]->value==_variable::NewA )
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{
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std::ostringstream ostr;
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ostr << FileLine(it->Token) << ": Memory leak:" << VariableNames[varlist[i]->varindex];
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ReportErr(ostr.str());
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}
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break;
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}
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break;
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}
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}
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break;
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}
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endif = (it->Type == STATEMENT::ENDIF);
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endloop = (it->Type == STATEMENT::ENDLOOP);
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endswitch = (it->Type == STATEMENT::ENDSWITCH);
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}
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}
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//---------------------------------------------------------------------------
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