walkero
/
cppcheck
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity
cppcheck/tokenize.cpp

765 lines
21 KiB
C++
Raw Blame History

//---------------------------------------------------------------------------
#include "tokenize.h"
#include "CommonCheck.h" // <- IsName
//---------------------------------------------------------------------------
#include <locale>
#include <fstream>
#include <map>
#include <string>
#include <stdlib.h> // <- strtoul
//---------------------------------------------------------------------------
// Helper functions..
static void Define(const char Name[], const char Value[]);
static void addtoken(const char str[], const unsigned int lineno, const unsigned int fileno);
static void combine_2tokens(TOKEN *tok, const char str1[], const char str2[]);
static int SizeOfType(const char type[]);
static void DeleteNextToken(TOKEN *tok);
//---------------------------------------------------------------------------
std::vector<std::string> Files;
struct TOKEN *tokens, *tokens_back;
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Defined symbols.
// "#define abc 123" will create a defined symbol "abc" with the value 123
//---------------------------------------------------------------------------
struct DefineSymbol
{
char *name;
char *value;
struct DefineSymbol *next;
};
static struct DefineSymbol * dsymlist;
static void Define(const char Name[], const char Value[])
{
if (!(Name && Name[0]))
return;
if (!(Value && Value[0]))
return;
// Is 'Value' a decimal value..
bool dec = true, hex = true;
for (int i = 0; Value[i]; i++)
{
if ( ! std::isdigit(Value[i]) )
dec = false;
if ( ! std::isxdigit(Value[i]) && (!(i==1 && Value[i]=='x')))
hex = false;
}
if (!dec && !hex)
return;
char *strValue = strdup(Value);
if (!dec && hex)
{
char str[50];
unsigned long value = strtoul(Value+2, NULL, 16);
free(strValue);
strValue = strdup(itoa(value, str, 10));
}
DefineSymbol *NewSym = new DefineSymbol;
memset(NewSym, 0, sizeof(DefineSymbol));
NewSym->name = strdup(Name);
NewSym->value = strValue;
NewSym->next = dsymlist;
dsymlist = NewSym;
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// addtoken
// add a token. Used by 'Tokenizer'
//---------------------------------------------------------------------------
static void addtoken(const char str[], const unsigned int lineno, const unsigned int fileno)
{
if (str[0] == 0)
return;
// The keyword 'unsigned' can be skipped for now.
if (strcmp(str,"unsigned")==0)
return;
// Replace hexadecimal value with decimal
char str2[50];
memset(str2, 0, sizeof(str2));
if (strncmp(str,"0x",2)==0)
{
unsigned int value = strtoul(str+2, NULL, 16);
itoa(value, str2, 10);
}
TOKEN *newtoken = new TOKEN;
memset(newtoken, 0, sizeof(TOKEN));
newtoken->str = strdup(str2[0] ? str2 : str);
newtoken->linenr = lineno;
newtoken->FileIndex = fileno;
if (tokens_back)
{
tokens_back->next = newtoken;
tokens_back = newtoken;
}
else
{
tokens = tokens_back = newtoken;
}
// Check if str is defined..
for (DefineSymbol *sym = dsymlist; sym; sym = sym->next)
{
if (strcmp(str,sym->name)==0)
{
free(newtoken->str);
newtoken->str = strdup(sym->value);
break;
}
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// combine_2tokens
// Combine two tokens that belong to each other. Ex: "<" and "=" may become "<="
//---------------------------------------------------------------------------
static void combine_2tokens(TOKEN *tok, const char str1[], const char str2[])
{
if (!(tok && tok->next))
return;
if (strcmp(tok->str,str1) || strcmp(tok->next->str,str2))
return;
free(tok->str);
tok->str = (char *)malloc(strlen(str1)+strlen(str2)+1);
strcpy(tok->str, str1);
strcat(tok->str, str2);
DeleteNextToken(tok);
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// SizeOfType - gives the size of a type
//---------------------------------------------------------------------------
std::map<std::string, unsigned int> TypeSize;
static int SizeOfType(const char type[])
{
if (!type)
return 0;
return TypeSize[type];
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// DeleteNextToken. Unlink and delete next token.
//---------------------------------------------------------------------------
static void DeleteNextToken(TOKEN *tok)
{
TOKEN *next = tok->next;
tok->next = next->next;
free(next->str);
delete next;
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Tokenize - tokenizes a given file.
//---------------------------------------------------------------------------
void Tokenize(const char FileName[])
{
// Has this file been tokenized already?
for (unsigned int i = 0; i < Files.size(); i++)
{
if ( stricmp(Files[i].c_str(), FileName) == 0 )
return;
}
std::ifstream fin(FileName);
if (!fin.is_open())
return;
unsigned int CurrentFile = Files.size();
Files.push_back(FileName);
unsigned int lineno = 1;
char CurrentToken[1000];
memset(CurrentToken, 0, sizeof(CurrentToken));
char *pToken = CurrentToken;
for (char ch = (char)fin.get(); !fin.eof(); ch = (char)fin.get())
{
if (ch == '#' && !CurrentToken[0])
{
std::string line;
getline(fin,line);
line = "#" + line;
if (strncmp(line.c_str(),"#include",8)==0 &&
line.find("\"") != std::string::npos)
{
// Extract the filename
line.erase(0, line.find("\"")+1);
line.erase(line.find("\""));
// Relative path..
if (strchr(FileName,'\\'))
{
char path[1000];
memset(path,0,sizeof(path));
const char *p = strrchr(FileName, '\\');
memcpy(path, FileName, p-FileName+1);
line = path + line;
}
addtoken("#include", lineno, CurrentFile);
addtoken(line.c_str(), lineno, CurrentFile);
Tokenize(line.c_str());
}
else if (strncmp(line.c_str(), "#define", 7) == 0)
{
char *strId = NULL;
enum {Space1, Id, Space2, Value} State;
State = Space1;
for (unsigned int i = 8; i < line.length(); i++)
{
if (State==Space1 || State==Space2)
{
if (std::isspace(line[i]))
continue;
State = (State==Space1) ? Id : Value;
}
else if (State==Id && std::isspace(line[i]))
{
strId = strdup(CurrentToken);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
State = Space2;
continue;
}
*pToken = line[i];
pToken++;
}
if (State==Value)
{
Define(strId, CurrentToken);
}
pToken = CurrentToken;
memset(CurrentToken, 0, sizeof(CurrentToken));
free(strId);
}
lineno++;
continue;
}
if (ch == '\n')
{
// Add current token..
addtoken(CurrentToken, lineno++, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
// Comments..
if (ch == '/' && !fin.eof())
{
// Add current token..
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
// Read next character..
ch = (char)fin.get();
// If '//'..
if (ch == '/')
{
while (!fin.eof() && (char)fin.get()!='\n');
lineno++;
continue;
}
// If '/*'..
if (ch == '*')
{
char chPrev;
ch = chPrev = 'A';
while (!fin.eof() && (chPrev!='*' || ch!='/'))
{
chPrev = ch;
ch = (char)fin.get();
if (ch == '\n')
lineno++;
}
continue;
}
// Not a comment.. add token..
addtoken("/", lineno, CurrentFile);
}
// char..
if (ch == '\'')
{
// Add previous token
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
// Read this ..
CurrentToken[0] = ch;
CurrentToken[1] = (char)fin.get();
CurrentToken[2] = (char)fin.get();
if (CurrentToken[1] == '\\')
CurrentToken[3] = (char)fin.get();
// Add token and start on next..
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
// String..
if (ch == '\"')
{
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
bool special = false;
char c = ch;
do
{
// Append token..
*pToken = c;
pToken++;
// Special sequence '\.'
if (special)
special = false;
else
special = (c == '\\');
// Get next character
c = (char)fin.get();
}
while (special || c != '\"');
*pToken = '\"';
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
if (strchr("+-*/%&|^?!=<>[](){};:,.",ch))
{
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
CurrentToken[0] = ch;
addtoken(CurrentToken, lineno, CurrentFile);
memset(CurrentToken, 0, sizeof(CurrentToken));
pToken = CurrentToken;
continue;
}
if (std::isspace(ch) || std::iscntrl(ch))
{
addtoken(CurrentToken, lineno, CurrentFile);
pToken = CurrentToken;
memset(CurrentToken, 0, sizeof(CurrentToken));
continue;
}
*pToken = ch;
pToken++;
}
// Combine tokens..
for (TOKEN *tok = tokens; tok && tok->next; tok = tok->next)
{
combine_2tokens(tok, "<", "<");
combine_2tokens(tok, ">", ">");
combine_2tokens(tok, "&", "&");
combine_2tokens(tok, "|", "|");
combine_2tokens(tok, "+", "=");
combine_2tokens(tok, "-", "=");
combine_2tokens(tok, "*", "=");
combine_2tokens(tok, "/", "=");
combine_2tokens(tok, "&", "=");
combine_2tokens(tok, "|", "=");
combine_2tokens(tok, "=", "=");
combine_2tokens(tok, "!", "=");
combine_2tokens(tok, "<", "=");
combine_2tokens(tok, ">", "=");
combine_2tokens(tok, ":", ":");
combine_2tokens(tok, "-", ">");
combine_2tokens(tok, "private", ":");
combine_2tokens(tok, "protected", ":");
combine_2tokens(tok, "public", ":");
}
// Replace constants..
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if (match(tok,"const type var = num ;"))
{
const char *sym = getstr(tok,2);
const char *num = getstr(tok,4);
for (TOKEN *tok2 = gettok(tok,6); tok2; tok2 = tok2->next)
{
if (strcmp(tok2->str,sym) == 0)
{
free(tok2->str);
tok2->str = strdup(num);
}
}
}
}
// Fill the map TypeSize..
TypeSize.clear();
TypeSize["char"] = sizeof(char);
TypeSize["short"] = sizeof(short);
TypeSize["int"] = sizeof(int);
TypeSize["long"] = sizeof(long);
TypeSize["float"] = sizeof(float);
TypeSize["double"] = sizeof(double);
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if (match(tok,"class type"))
{
TypeSize[getstr(tok,1)] = 11;
}
else if (match(tok, "struct type"))
{
TypeSize[getstr(tok,1)] = 13;
}
}
// Replace 'sizeof(type)'..
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if (strcmp(tok->str,"sizeof") != 0)
continue;
if (match(tok, "sizeof ( type * )"))
{
free(tok->str);
char str[10];
// 'sizeof(type *)' has the same size as 'sizeof(char *)'
tok->str = strdup(itoa(sizeof(char *), str, 10));
for (int i = 0; i < 4; i++)
{
DeleteNextToken(tok);
}
}
else if (match(tok, "sizeof ( type )"))
{
const char *type = getstr(tok, 2);
int size = SizeOfType(type);
if (size > 0)
{
free(tok->str);
char str[10];
tok->str = strdup(itoa(size, str, 10));
for (int i = 0; i < 3; i++)
{
DeleteNextToken(tok);
}
}
}
}
// Replace 'sizeof(var)'
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
// type array [ num ] ;
if ( ! match(tok, "type var [ num ] ;") )
continue;
int size = SizeOfType(tok->str);
if (size <= 0)
continue;
const char *varname = getstr(tok, 1);
int total_size = size * atoi( getstr(tok, 3) );
// Replace 'sizeof(var)' with number
int indentlevel = 0;
for ( TOKEN *tok2 = gettok(tok,5); tok2; tok2 = tok2->next )
{
if (tok2->str[0] == '{')
{
indentlevel++;
}
else if (tok2->str[0] == '}')
{
indentlevel--;
if (indentlevel < 0)
break;
}
else if (match(tok2, "sizeof ( var )"))
{
if (strcmp(getstr(tok2,2), varname) == 0)
{
free(tok2->str);
char str[20];
tok2->str = strdup(itoa(total_size, str, 10));
// Delete the other tokens..
for (int i = 0; i < 3; i++)
{
DeleteNextToken(tok2);
}
}
}
}
}
// Simple calculations..
bool done = false;
while (!done)
{
done = true;
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if (match(tok->next, "* 1") || match(tok->next, "1 *"))
{
for (int i = 0; i < 2; i++)
DeleteNextToken(tok);
done = false;
}
// (1-2)
if (strchr("[,(=<>",tok->str[0]) &&
IsNumber(getstr(tok,1)) &&
strchr("+-*/",*(getstr(tok,2))) &&
IsNumber(getstr(tok,3)) &&
strchr("],);=<>",*(getstr(tok,4))) )
{
done = false;
int i1 = atoi(getstr(tok,1));
int i2 = atoi(getstr(tok,3));
switch (*(getstr(tok,2)))
{
case '+': i1 += i2; break;
case '-': i1 -= i2; break;
case '*': i1 *= i2; break;
case '/': i1 /= i2; break;
}
tok = tok->next;
free(tok->str);
char str[10];
tok->str = strdup(itoa(i1,str,10));
for (int i = 0; i < 2; i++)
{
DeleteNextToken(tok);
}
}
}
}
// Replace "*(str + num)" => "str[num]"
for (TOKEN *tok = tokens; tok; tok = tok->next)
{
if ( ! strchr(";{}(=<>", tok->str[0]) )
continue;
TOKEN *next = tok->next;
if ( ! next )
break;
if (match(next, "* ( var + num )"))
{
const char *str[4] = {"var","[","num","]"};
str[0] = getstr(tok,3);
str[2] = getstr(tok,5);
for (int i = 0; i < 4; i++)
{
tok = tok->next;
free(tok->str);
tok->str = strdup(str[i]);
}
DeleteNextToken(tok);
DeleteNextToken(tok);
}
}
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// Helper functions for handling the tokens list
//---------------------------------------------------------------------------
TOKEN *findtoken(TOKEN *tok1, const char *tokenstr[])
{
for (TOKEN *ret = tok1; ret; ret = ret->next)
{
unsigned int i = 0;
TOKEN *tok = ret;
while (tokenstr[i])
{
if (!tok)
return NULL;
if (*(tokenstr[i]) && strcmp(tokenstr[i],tok->str))
break;
tok = tok->next;
i++;
}
if (!tokenstr[i])
return ret;
}
return NULL;
}
//---------------------------------------------------------------------------
bool match(TOKEN *tok, const std::string pattern)
{
if (!tok)
return false;
const char *p = pattern.c_str();
while (*p)
{
char str[50];
char *s = str;
while (*p==' ')
p++;
while (*p && *p!=' ')
{
*s = *p;
s++;
p++;
}
*s = 0;
if (str[0] == 0)
return true;
if (strcmp(str,"var")==0 || strcmp(str,"type")==0)
{
if (!IsName(tok->str))
return false;
}
else if (strcmp(str,"num")==0)
{
if (!std::isdigit(tok->str[0]))
return false;
}
else if (strcmp(str, tok->str) != 0)
return false;
tok = tok->next;
if (!tok)
return false;
}
return true;
}
//---------------------------------------------------------------------------
TOKEN *gettok(TOKEN *tok, int index)
{
while (tok && index>0)
{
tok = tok->next;
index--;
}
return tok;
}
//---------------------------------------------------------------------------
const char *getstr(TOKEN *tok, int index)
{
tok = gettok(tok, index);
return tok ? tok->str : "";
}
//---------------------------------------------------------------------------
Reference in New Issue View Git Blame Copy Permalink