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cparse.c
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cparse.c
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/* Copyright (c) 2002 Hewlett-Packard under GPL version 2 or later */
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "pmccabe.h"
#include "dmain.h"
/* $Id: cparse.c,v 1.24 2001/01/26 23:00:30 bame Exp $ */
int
fancygettoken(char *buf, int classflag, int *line, int *nLine)
{
int c;
char tmpbuf[256];
if ((c = gettoken(buf, line, nLine)) == T_IDENT)
{
if ((c = gettoken(tmpbuf, NULL, NULL)) == ':')
{
if ((c = ncss_Getchar()) == ':')
{
buf += strlen(buf); *buf++ = ':'; *buf++ = ':';
*buf = '\0';
switch (c = gettoken(tmpbuf, NULL, NULL))
{
case T_OPERATOR:
strcat(buf, tmpbuf);
buf += strlen(buf);
getoverloadedop(buf);
break;
case T_IDENT:
/* ident::ident - could be recursive */
ncss_Ungets(tmpbuf);
if ((c = fancygettoken(buf, 1, NULL, NULL)) != T_IDENT)
ncss_Ungetc(c);
break;
case '~': /* destructor, collect the identifier */
*buf++ = c;
gettoken(buf, NULL, NULL);
break;
default:
ncss_Ungetc(c);
*buf++ = '\0';
break;
}
}
else
{
/* only got ':', who knows what this is */
ncss_Ungets("::");
}
}
else
{
ungettoken(c, tmpbuf);
}
c = T_IDENT;
}
else if (classflag && c == T_OPERATOR)
{
/* strcat(buf, tmpbuf); */
buf += strlen(buf);
getoverloadedop(buf);
}
else if (classflag && c == '~')
{
*buf++ = c;
c = gettoken(buf, NULL, NULL);
if (c != T_IDENT)
{
fprintf(stderr, "fatal error file %s line %d\n",
__FILE__, __LINE__);
exit(3);
}
}
return c;
}
int
toplevelstatement(stats_t *stats)
/*
* At the top level of a C file, the statements are blocks of
* tokens ending in either ; or are function definitions which
* end in }. Interesting types of statements include class
* and struct definitions - because they may contain inline functions,
* and function definitions. All others are merely counted.
*/
{
int endofstatement = FALSE;
int c;
char buf[1024];
int functionFirstLine = -1;
int functionFirstNLine = -1;
int functionDefLine;
int line, nLine;
buf[0] = '\0';
c = skipws();
ncss_Ungetc(c);
/* gettoken eats whitespace */
while (!endofstatement &&
(c = fancygettoken(buf, stats->type == STATS_CLASS, &line, &nLine)) != EOF)
{
if (functionFirstLine == -1)
{
functionFirstLine = line;
functionFirstNLine = nLine;
}
switch (c)
{
case T_EXTERN:
case T_CLASS:
case T_STRUCT:
case T_UNION:
if (maybeclass())
{
stats->nsemicolons--;
endofstatement = TRUE;
}
break;
case T_NAMESPACE:
if (maybenamespace())
{
/* no trailing semicolon for namespaces */
endofstatement = TRUE;
}
break;
case '(':
/* possible start of function */
functionDefLine = Line;
possiblefn(stats, buf, functionFirstLine, functionDefLine, functionFirstNLine);
endofstatement = TRUE;
break;
case '}':
case ')':
Exit = 2;
{
char _buf[100];
sprintf(_buf, "too many %c's", c);
fileerror(_buf);
}
break;
case '{':
c = matchcurly();
break;
case ':': /* This should catch C++ "class foo { public: } */
case ';':
/* end of statement */
endofstatement = TRUE;
break;
case T_ENUM:
c = fancygettoken(buf, stats->type == STATS_CLASS, &line, &nLine);
if (c == T_CLASS || c == T_STRUCT) {
endofstatement = TRUE;
break;
}
else {
ungettoken(c, buf);
}
break;
default:
break;
}
}
return c;
}
int
findchar(char fc)
{
int c;
while ((c = ncss_Getchar()) != EOF && c != fc)
{
}
return c;
}
int
maybeclass()
/*
* We've just seen "class" at the top level in a file so
* we may be entering a definition of same. If so, we want to be
* on the lookout for inline functions. Return 1 if this is a
* class definition else restore the function name and return 0.
*/
{
char classname[256], dummy[256];
int isclass = 0;
int c;
if ((c =gettoken(classname, NULL, NULL)) == T_IDENT)
{
/* "class name" */
switch(c = gettoken(dummy, NULL, NULL))
{
case '{': /* "class name {" */
break;
case ':': /* "class name :" */
c = gettoken(dummy, NULL, NULL);
if (c == ':')
{
/* "class name :: */
/* this is a namespace-qualified declaration since cannot
have a definition like this. */
break;
}
else
{
/* "clas name : [one or more initializers]" */
while (c != '{')
{
c = gettoken(dummy, NULL, NULL);
}
}
break;
default:
/* if we fail to get "class name [:.*] {" */
ungettoken(c, dummy);
}
}
else if (c == '{') /* Unnamed class */
{
/* "class {" */
strcpy(classname, "unnamed");
}
else
{
/* "class BOGUS" -- perhaps this is C code using a variable "class" */
ungettoken(c, dummy);
}
if (isclass = (c == '{'))
{
stats_t *class = stats_push(classname, STATS_CLASS);
while ((c = gettoken(dummy, NULL, NULL)) != '}')
{
if (c == EOF)
{
fileerror("unexpected EOF");
break;
}
else
ungettoken(c, dummy);
toplevelstatement(class);
}
stats_pop(class);
}
return isclass;
}
int
maybenamespace()
/*
* We've just seen "namespace" at the top level in a file so
* we may be entering a definition of same (if we next find "token {").
* Return 1 if this is a
* namespace definition else restore the name and return 0.
*/
{
char nsname[256], dummy[256];
int isns = 0;
int c;
if ((c = gettoken(nsname, NULL, NULL)) == T_IDENT)
{
/* "namespace name" */
switch(c = gettoken(dummy, NULL, NULL))
{
case '{': /* "namespace name {" */
break;
default:
/* if we fail to get "namespace name {" */
ungettoken(c, dummy);
}
}
else if (c == '{') /* Unnamed namespace */
{
/* "namespace {" */
strcpy(nsname, "anonymous_namespace");
}
else
{
/* "namespace BOGUS" -- is C code using a variable "namespace"? */
ungettoken(c, dummy);
}
if (isns = (c == '{'))
{
stats_t *ns = stats_push(nsname, STATS_NAMESPACE);
while ((c = gettoken(dummy, NULL, NULL)) != '}')
{
if (c == EOF)
{
fileerror("unexpected EOF");
break;
}
else
ungettoken(c, dummy);
toplevelstatement(ns);
}
stats_pop(ns);
}
return isns;
}
void
findsemicolon()
{
int c;
while ((c = ncss_Getchar()) != EOF && c != ';')
{
switch (c)
{
case '(':
c = matchparen();
break;
case '{':
c = matchcurly();
break;
}
}
if (c == EOF)
{
Exit = 5;
fileerror("expected ';' got EOF");
}
}
int
getoverloadedop(char *buf)
/*
* Having just read ident::operator, try to read the operator into buf.
* If the first non-WS character is a '(', the overloaded thing is a
* function call. Otherwise it's some type of real operator and we
* terminate normally on '('. If we read ; or { we probably should
* print a warning and bail out.
*/
{
char *savebuf = buf;
char tmpbuf[256];
int c = gettoken(tmpbuf, NULL, NULL);
if (c == '(')
{
/* overloaded function call syntax */
*buf++ = c;
/* Match the paren */
while(c != ')')
{
if ((c = skipws()) == EOF)
break;
*buf++ = c;
}
}
else if (c == T_IDENT)
{
/* class::operator int() */
/* Overloaded typecast */
*buf++ = '_';
*buf = '\0';
strcat(buf, tmpbuf);
buf += strlen(buf);
*buf++ = '(';
*buf++ = ')';
*buf = '\0';
}
else if (c != EOF)
{
*buf++ = c;
while ((c = ncss_Getchar()) != EOF)
{
if (!ISSPACE(c))
{
if (c == '(' || c == ';')
{
ncss_Ungetc(c);
break;
}
else
*buf++ = c;
}
}
}
*buf = '\0';
return c;
}
void
possiblefn(stats_t *stats, const char *name, int line1, int defline, int nLine1)
/*
* We've just read an open parenthesis. If there's a legal identifier
* in name we may be within a function definition.
*/
{
char dummy[257];
int nstatements = 0; /* in case there's code prior to the { */
int c;
if (strlen(name) == 0)
{
/* no function name - must not be a function - return */
findsemicolon();
}
else
{
if ((c = matchparen()) != EOF)
{
c = gettoken(dummy, NULL, NULL);
switch (c)
{
case T_OVERRIDE:
case T_FINAL:
case T_ATTRIBUTE:
case T_NOEXCEPT:
c = gettoken(dummy, NULL, NULL);
break;
case T_CONST:
if (strchr(name, ':') != NULL || stats->type == STATS_CLASS)
{
/* foo::foo() const ^ [;] { */
/* This'll either be a ; for a declaration or a { */
c = gettoken(dummy, NULL, NULL);
/* handle foo::foo() const override */
if (c == T_OVERRIDE)
c = gettoken(dummy, NULL, NULL);
break;
}
/* foo() const ^ char *a; { */
/*** FALL THROUGH ***/
case T_IDENT:
case T_STRUCT:
case T_UNION:
/* if (strchr(name, ':') == NULL && stats->type != STATS_CLASS) */
{
/* K&R function, T_IDENT is part of first parm defn */
/* Read up to that first '{' */
/* function foo(a, b, c) int a; */
/* ^ */
while ((c = ncss_Getchar()) != EOF && c != '{')
{
}
}
break;
case '{':
/* open { of the function */
break;
case '(':
/* wierd possibility in C++ - what we thought was the */
/* parameter list was really part of an overloaded */
/* operator overloading of an odd typecast or something. */
/* The function name will be wrong but who cares :-> */
c = matchparen();
if (c != EOF)
c = gettoken(dummy, NULL, NULL);
break;
case ':':
/* Another C++-ism: main(args): ident(args), ident(args) */
c = prefunction(&nstatements);
break;
}
if (c == '{')
{
/* This really is a function */
stats_t *fn = stats_push(name, STATS_FUNCTION);
fn->nfunctions = 1;
fn->firstline = line1;
fn->defline = defline;
fn->nsemicolons = nstatements;
c = countfunction(fn);
fn->nLines = ncss_Line - nLine1;
stats->nLines -= fn->nLines;
if (!Totalsonly && !Filesonly)
printstats(fn);
stats_pop(fn);
}
}
}
}
int
prefunction(int *nstatements)
/*
* Handle C++ ident(args) : ident(args), ident(args). Count each
* ident(args) after function declaration as a statement.
*/
{
int c;
(*nstatements)++;
while((c = ncss_Getchar()) != EOF)
{
switch(c)
{
case '(':
c = matchparen();
break;
case ',':
(*nstatements)++;
break;
case '{':
return c;
}
}
Exit = 9;
fileerror("expected { got EOF");
return c;
}
int
countfunction(stats_t *fn)
{
int nest = 1;
int c;
char id[257];
while (nest > 0 && (c = gettoken2(id, NULL, NULL)) != EOF)
{
switch (c)
{
case ';':
fn->nsemicolons++;
break;
case '{':
nest++;
break;
case '}':
nest--;
break;
case '?':
fn->nq++;
break;
case T_LOGICAL:
fn->nor++;
break;
case '^':
fn->nor++; /* This is XOR but I'm lazy */
break;
case T_CLASS:
case T_UNION:
case T_STRUCT:
if (maybeclass())
fn->nsemicolons--;
break;
default:
countword(fn, c);
break;
}
}
fn->lastline = Line;
if (nest > 0 /* && c == EOF */ )
{
Exit = 6;
fileerror("not enough }'s");
}
return c;
}
void
countword(stats_t * fn, int id)
{
switch (id)
{
case T_IF:
fn->nif++;
break;
case T_FOR:
fn->nfor++;
break;
case T_WHILE:
fn->nwhile++;
break;
case T_SWITCH:
fn->nswitch++;
break;
case T_CASE:
fn->ncase++;
break;
}
}