811 lines
18 KiB
C
811 lines
18 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Id$ */
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/* PREPROCESSOR: CONTROLLINE INTERPRETER */
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#include <stdlib.h>
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#include "arith.h"
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#include "LLlex.h"
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#include "Lpars.h"
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#include "idf.h"
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#include "input.h"
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#include "parameters.h"
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#include <assert.h>
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#include <alloc.h>
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#include "class.h"
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#include "macro.h"
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#include "bits.h"
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#include "replace.h"
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extern char options[];
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extern char **inctable; /* list of include directories */
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extern char *getwdir();
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char ifstack[IFDEPTH]; /* if-stack: the content of an entry is */
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/* 1 if a corresponding ELSE has been */
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/* encountered. */
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int nestlevel = -1;
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int svnestlevel[30] = {-1};
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int nestcount;
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extern int do_preprocess;
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void macro_def();
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void do_define();
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char *
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GetIdentifier(skiponerr)
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int skiponerr; /* skip the rest of the line on error */
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{
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/* Returns a pointer to the identifier that is read from the
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input stream. When the input does not contain an
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identifier, the rest of the line is skipped when skiponerr
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is on, and a null-pointer is returned.
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The substitution of macros is disabled.
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Remember that on end-of-line EOF is returned.
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*/
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int tmp = UnknownIdIsZero;
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int tok;
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struct token tk;
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UnknownIdIsZero = ReplaceMacros = 0;
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tok = GetToken(&tk);
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ReplaceMacros = 1;
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UnknownIdIsZero = tmp;
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if (tok != IDENTIFIER) {
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if (skiponerr && tok != EOF) SkipToNewLine();
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return (char *)0;
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}
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return tk.tk_str;
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}
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/* domacro() is the control line interpreter. The '#' has already
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been read by the lexical analyzer by which domacro() is called.
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The token appearing directly after the '#' is obtained by calling
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the basic lexical analyzing function GetToken() and is interpreted
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to perform the action belonging to that token.
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An error message is produced when the token is not recognized.
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Pragma's are handled by do_pragma(). They are passed on to the
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compiler.
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*/
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domacro()
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{
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struct token tk; /* the token itself */
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register struct idf *id;
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int toknum;
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ReplaceMacros = 0;
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toknum = GetToken(&tk);
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ReplaceMacros = 1;
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switch(toknum) { /* select control line action */
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case IDENTIFIER: /* is it a macro keyword? */
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id = findidf(tk.tk_str);
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if (!id) {
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error("%s: unknown control", tk.tk_str);
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SkipToNewLine();
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free(tk.tk_str);
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break;
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}
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free(tk.tk_str);
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switch (id->id_resmac) {
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case K_DEFINE: /* "define" */
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do_define();
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break;
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case K_ELIF: /* "elif" */
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do_elif();
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break;
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case K_ELSE: /* "else" */
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do_else();
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break;
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case K_ENDIF: /* "endif" */
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do_endif();
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break;
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case K_IF: /* "if" */
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do_if();
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break;
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case K_IFDEF: /* "ifdef" */
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do_ifdef(1);
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break;
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case K_IFNDEF: /* "ifndef" */
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do_ifdef(0);
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break;
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case K_INCLUDE: /* "include" */
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do_include();
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break;
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case K_LINE: /* "line" */
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/* set LineNumber and FileName according to
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the arguments.
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*/
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if (GetToken(&tk) != INTEGER) {
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error("bad #line syntax");
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SkipToNewLine();
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}
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else
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do_line((unsigned int)tk.tk_val);
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break;
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case K_ERROR: /* "error" */
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do_error();
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break;
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case K_PRAGMA: /* "pragma" */
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do_pragma();
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break;
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case K_UNDEF: /* "undef" */
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do_undef((char *)0);
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break;
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default:
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/* invalid word seen after the '#' */
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error("%s: unknown control", id->id_text);
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SkipToNewLine();
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}
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break;
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case INTEGER: /* # <integer> [<filespecifier>]? */
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do_line((unsigned int)tk.tk_val);
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break;
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case EOF: /* only `#' on this line: do nothing, ignore */
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break;
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default: /* invalid token following '#' */
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error("illegal # line");
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SkipToNewLine();
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}
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}
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void
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skip_block(to_endif)
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int to_endif;
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{
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/* skip_block() skips the input from
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1) a false #if, #ifdef, #ifndef or #elif until the
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corresponding #elif (resulting in true), #else or
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#endif is read.
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2) a #else corresponding to a true #if, #ifdef,
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#ifndef or #elif until the corresponding #endif is
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seen.
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*/
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register int ch;
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register int skiplevel = nestlevel; /* current nesting level */
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struct token tk;
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int toknum;
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struct idf *id;
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NoUnstack++;
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for (;;) {
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ch = GetChar(); /* read first character after newline */
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while (class(ch) == STSKIP)
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ch = GetChar();
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if (ch != '#') {
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if (ch == EOI) {
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NoUnstack--;
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return;
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}
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if (ch == '/') {
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if (ch != '*') UnGetChar();
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else {
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skipcomment();
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continue;
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}
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} else UnGetChar();
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SkipToNewLine();
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continue;
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}
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ReplaceMacros = 0;
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toknum = GetToken(&tk);
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ReplaceMacros = 1;
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if (toknum != IDENTIFIER) {
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if (toknum != INTEGER) {
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error("illegal # line");
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}
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SkipToNewLine();
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continue;
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}
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/* an IDENTIFIER: look for #if, #ifdef and #ifndef
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without interpreting them.
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Interpret #else, #elif and #endif if they occur
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on the same level.
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*/
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id = findidf(tk.tk_str);
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if (id == (struct idf *)0) {
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/* invalid word seen after the '#' */
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warning("%s: unknown control", tk.tk_str);
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}
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free(tk.tk_str);
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if (id == (struct idf *)0) continue;
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switch(id->id_resmac) {
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case K_DEFINE:
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case K_ERROR:
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case K_INCLUDE:
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case K_LINE:
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case K_PRAGMA:
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case K_UNDEF:
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case K_FILE:
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SkipToNewLine();
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break;
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case K_IF:
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case K_IFDEF:
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case K_IFNDEF:
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push_if();
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SkipToNewLine();
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break;
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case K_ELIF:
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if (ifstack[nestlevel])
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error("#elif after #else");
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if (!to_endif && nestlevel == skiplevel) {
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nestlevel--;
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push_if();
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if (ifexpr()) {
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NoUnstack--;
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return;
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}
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}
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else SkipToNewLine(); /* otherwise done in ifexpr() */
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break;
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case K_ELSE:
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if (ifstack[nestlevel])
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error("#else after #else");
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++(ifstack[nestlevel]);
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if (!to_endif && nestlevel == skiplevel) {
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if (SkipToNewLine()) {
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if (!options['o'])
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strict("garbage following #else");
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}
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NoUnstack--;
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return;
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}
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else SkipToNewLine();
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break;
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case K_ENDIF:
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assert(nestlevel > svnestlevel[nestcount]);
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if (nestlevel == skiplevel) {
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if (SkipToNewLine()) {
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if (!options['o'])
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strict("garbage following #endif");
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}
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nestlevel--;
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NoUnstack--;
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return;
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}
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else SkipToNewLine();
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nestlevel--;
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break;
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}
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}
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}
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ifexpr()
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{
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/* ifexpr() returns whether the restricted constant
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expression following #if or #elif evaluates to true. This
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is done by calling the LLgen generated subparser for
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constant expressions. The result of this expression will
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be given in the extern long variable "ifval".
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*/
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extern arith ifval;
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int errors = err_occurred;
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ifval = (arith)0;
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AccDefined = 1;
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UnknownIdIsZero = 1;
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DOT = 0; /* tricky */
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If_expr(); /* invoke constant expression parser */
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AccDefined = 0;
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UnknownIdIsZero = 0;
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return (errors == err_occurred) && (ifval != (arith)0);
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}
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do_include()
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{
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/* do_include() performs the inclusion of a file.
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*/
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char *filenm;
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char *result;
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int tok;
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struct token tk;
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AccFileSpecifier = 1;
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if (((tok = GetToken(&tk)) == FILESPECIFIER) || tok == STRING)
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filenm = tk.tk_str;
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else {
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error("bad include syntax");
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filenm = (char *)0;
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}
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AccFileSpecifier = 0;
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if (SkipToNewLine()) {
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error("bad include syntax");
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}
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inctable[0] = WorkingDir;
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if (filenm) {
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if (!InsertFile(filenm, &inctable[tok==FILESPECIFIER],&result)){
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if (do_preprocess) error("cannot open include file \"%s\"", filenm);
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else warning("cannot open include file \"%s\"", filenm);
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add_dependency(filenm);
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}
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else {
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add_dependency(result);
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WorkingDir = getwdir(result);
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svnestlevel[++nestcount] = nestlevel;
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FileName = result;
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LineNumber = 1;
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}
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}
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}
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void
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do_define()
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{
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/* do_define() interprets a #define control line.
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*/
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register char *str; /* the #defined identifier's descriptor */
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int nformals = -1; /* keep track of the number of formals */
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char *formals[NPARAMS]; /* pointers to the names of the formals */
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char parbuf[PARBUFSIZE]; /* names of formals */
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char *repl_text; /* start of the replacement text */
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int length; /* length of the replacement text */
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register ch;
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char *get_text();
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/* read the #defined macro's name */
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if (!(str = GetIdentifier(1))) {
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error("#define: illegal macro name");
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return;
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}
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/* there is a formal parameter list if the identifier is
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followed immediately by a '('.
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*/
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ch = GetChar();
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if (ch == '(') {
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if ((nformals = getparams(formals, parbuf)) == -1) {
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SkipToNewLine();
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free(str);
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return; /* an error occurred */
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}
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ch = GetChar();
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}
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/* read the replacement text if there is any */
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ch = skipspaces(ch,0); /* find first character of the text */
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assert(ch != EOI);
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/* UnGetChar() is not right when replacement starts with a '/' */
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ChPushBack(ch);
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repl_text = get_text((nformals > 0) ? formals : 0, &length);
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macro_def(str2idf(str, 0), repl_text, nformals, length, NOFLAG);
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LineNumber++;
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}
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push_if()
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{
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if (nestlevel >= IFDEPTH)
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fatal("too many nested #if/#ifdef/#ifndef");
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else
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ifstack[++nestlevel] = 0;
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}
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do_elif()
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{
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if (nestlevel <= svnestlevel[nestcount]) {
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error("#elif without corresponding #if");
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SkipToNewLine();
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}
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else { /* restart at this level as if a #if is detected. */
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if (ifstack[nestlevel]) {
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error("#elif after #else");
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SkipToNewLine();
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}
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nestlevel--;
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push_if();
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skip_block(1);
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}
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}
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do_else()
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{
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if (SkipToNewLine()) {
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if (!options['o'])
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strict("garbage following #else");
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}
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if (nestlevel <= svnestlevel[nestcount])
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error("#else without corresponding #if");
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else { /* mark this level as else-d */
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if (ifstack[nestlevel]) {
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error("#else after #else");
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}
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++(ifstack[nestlevel]);
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skip_block(1);
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}
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}
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do_endif()
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{
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if (SkipToNewLine()) {
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if (!options['o'])
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strict("garbage following #endif");
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}
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if (nestlevel <= svnestlevel[nestcount]) {
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error("#endif without corresponding #if");
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}
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else nestlevel--;
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}
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do_if()
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{
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push_if();
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if (!ifexpr()) /* a false #if/#elif expression */
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skip_block(0);
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}
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do_ifdef(how)
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{
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register struct idf *id;
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register char *str;
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/* how == 1 : ifdef; how == 0 : ifndef
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*/
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push_if();
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if (!(str = GetIdentifier(1))) {
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error("illegal #ifdef construction");
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id = (struct idf *)0;
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} else {
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id = findidf(str);
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free(str);
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}
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if (SkipToNewLine()) {
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if (str && !options['o'])
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strict("garbage following #%s <identifier>",
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how ? "ifdef" : "ifndef");
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}
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/* The next test is a shorthand for:
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(how && !id->id_macro) || (!how && id->id_macro)
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*/
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if (how ^ (id && id->id_macro != 0))
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skip_block(0);
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}
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/* argstr != NULL when the undef came from a -U option */
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do_undef(argstr)
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char *argstr;
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{
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register struct idf *id;
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register char *str = argstr;
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/* Forget a macro definition. */
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if (str || (str = GetIdentifier(1))) {
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if ((id = findidf(str)) && id->id_macro) {
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if (id->id_macro->mc_flag & NOUNDEF) {
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error("it is not allowed to #undef %s", str);
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} else {
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free(id->id_macro->mc_text);
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free_macro(id->id_macro);
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id->id_macro = (struct macro *) 0;
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}
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} /* else: don't complain */
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if (!argstr){
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free(str);
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if (SkipToNewLine()) {
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if (!options['o'])
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strict("garbage following #undef");
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}
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}
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}
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else
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error("illegal #undef construction");
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}
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do_error()
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{
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int len;
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char *get_text();
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char *bp = get_text((char **) 0, &len);
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error("user error: %s", bp);
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free(bp);
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LineNumber++;
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}
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|
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int
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getparams(buf, parbuf)
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char *buf[];
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char parbuf[];
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{
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/* getparams() reads the formal parameter list of a macro
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definition.
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The number of parameters is returned.
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|
As a formal parameter list is expected when calling this
|
|
routine, -1 is returned if an error is detected, for
|
|
example:
|
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#define one(1), where 1 is not an identifier.
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Note that the '(' has already been eaten.
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The names of the formal parameters are stored into parbuf.
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*/
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register char **pbuf = &buf[0];
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register int c;
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register char *ptr = &parbuf[0];
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register char **pbuf2;
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c = GetChar();
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c = skipspaces(c,0);
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if (c == ')') { /* no parameters: #define name() */
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*pbuf = (char *) 0;
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return 0;
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}
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for (;;) { /* eat the formal parameter list */
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if (class(c) != STIDF && class(c) != STELL) {
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error("#define: bad formal parameter");
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return -1;
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}
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*pbuf = ptr; /* name of the formal */
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*ptr++ = c;
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if (ptr >= &parbuf[PARBUFSIZE])
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fatal("formal parameter buffer overflow");
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do { /* eat the identifier name */
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c = GetChar();
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*ptr++ = c;
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if (ptr >= &parbuf[PARBUFSIZE])
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fatal("formal parameter buffer overflow");
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} while (in_idf(c));
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*(ptr - 1) = '\0'; /* mark end of the name */
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|
|
/* Check if this formal parameter is already used.
|
|
Usually, macros do not have many parameters, so ...
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*/
|
|
for (pbuf2 = pbuf - 1; pbuf2 >= &buf[0]; pbuf2--) {
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|
if (!strcmp(*pbuf2, *pbuf)) {
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warning("formal parameter \"%s\" already used",
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*pbuf);
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}
|
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}
|
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|
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pbuf++;
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c = skipspaces(c,0);
|
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if (c == ')') { /* end of the formal parameter list */
|
|
*pbuf = (char *) 0;
|
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return pbuf - buf;
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}
|
|
if (c != ',') {
|
|
error("#define: bad formal parameter list");
|
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return -1;
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}
|
|
c = GetChar();
|
|
c = skipspaces(c,0);
|
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}
|
|
/*NOTREACHED*/
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|
}
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void
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macro_def(id, text, nformals, length, flags)
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register struct idf *id;
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char *text;
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{
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register struct macro *newdef = id->id_macro;
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/* macro_def() puts the contents and information of a macro
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definition into a structure and stores it into the symbol
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table entry belonging to the name of the macro.
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An error is given if there was already a definition
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*/
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if (newdef) { /* is there a redefinition? */
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if (newdef->mc_flag & NOUNDEF) {
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error("it is not allowed to redefine %s", id->id_text);
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} else if (!macroeq(newdef->mc_text, text))
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error("illegal redefine of \"%s\"", id->id_text);
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free(text);
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return;
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} else {
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#ifdef DOBITS
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register char *p = id->id_text;
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#define setbit(bx) if (!*p) goto go_on; bits[*p++] |= (bx)
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setbit(bit0);
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setbit(bit1);
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setbit(bit2);
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setbit(bit3);
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setbit(bit4);
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setbit(bit5);
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setbit(bit6);
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setbit(bit7);
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go_on:
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#endif
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id->id_macro = newdef = new_macro();
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}
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newdef->mc_text = text; /* replacement text */
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newdef->mc_nps = nformals; /* nr of formals */
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newdef->mc_length = length; /* length of repl. text */
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newdef->mc_flag = flags; /* special flags */
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}
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int
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find_name(nm, index)
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char *nm, *index[];
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{
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/* find_name() returns the index of "nm" in the namelist
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"index" if it can be found there. 0 is returned if it is
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not there.
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*/
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register char **ip = &index[0];
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while (*ip)
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if (strcmp(nm, *ip++) == 0)
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return ip - &index[0];
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/* arrived here, nm is not in the name list. */
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return 0;
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}
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#define BLANK(ch) ((ch == ' ') || (ch == '\t'))
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char *
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get_text(formals, length)
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char *formals[];
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int *length;
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{
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/* get_text() copies the replacement text of a macro
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definition with zero, one or more parameters, thereby
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substituting each formal parameter by a special character
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(non-ascii: 0200 & (order-number in the formal parameter
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list)) in order to substitute this character later by the
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actual parameter. The replacement text is copied into
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itself because the copied text will contain fewer or the
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same amount of characters. The length of the replacement
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text is returned.
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Implementation:
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finite automaton : we are interested in
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1- white space, sequences must be mapped onto 1 single
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blank.
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2- identifiers, since they might be replaced by some
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actual parameter.
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3- strings and character constants, since replacing
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variables within them is illegal, and white-space is
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significant.
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4- comment, same as for 1
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Other tokens will not be seen as such.
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*/
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register int c;
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struct repl repls;
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register struct repl *repl = &repls;
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int blank = 0;
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c = GetChar();
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repl->r_ptr = repl->r_text = Malloc((unsigned)(repl->r_size = ITEXTSIZE));
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*repl->r_ptr = '\0';
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while ((c != EOI) && (class(c) != STNL)) {
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if (BLANK(c)) {
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blank++;
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c = GetChar();
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continue;
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}
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if (c == '\'' || c == '"') {
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register int delim = c;
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if (blank) {
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blank = 0;
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add2repl(repl, ' ');
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}
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do {
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add2repl(repl, c);
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if (c == '\\') add2repl(repl, GetChar());
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c = GetChar();
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} while (c != delim && c != EOI && class(c) != STNL);
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if (c != delim) {
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strict("unclosed opening %c", delim);
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break;
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}
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add2repl(repl, c);
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c = GetChar();
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} else if (c == '/') {
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c = GetChar();
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if (c == '*') {
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skipcomment();
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blank++;
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c = GetChar();
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continue;
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}
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if (blank) {
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blank = 0;
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add2repl(repl, ' ');
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}
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add2repl(repl, '/');
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} else if (formals
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&& (class(c) == STIDF || class(c) == STELL)) {
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char id_buf[IDFSIZE + 1];
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register char *idp = id_buf;
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int n;
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/* read identifier: it may be a formal parameter */
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*idp++ = c;
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do {
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c = GetChar();
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if (idp <= &id_buf[IDFSIZE])
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*idp++ = c;
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} while (in_idf(c));
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*--idp = '\0';
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if (blank) {
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blank = 0;
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add2repl(repl, ' ');
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}
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/* construct the formal parameter mark or identifier */
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if (n = find_name(id_buf, formals))
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add2repl(repl, FORMALP | (char) n);
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else {
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idp = id_buf;
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while (*idp) add2repl(repl, *idp++);
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}
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} else if (class(c) == STNUM) {
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if (blank) {
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blank = 0;
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add2repl(repl, ' ');
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}
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add2repl(repl, c);
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if (c == '.') {
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c = GetChar();
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if (class(c) != STNUM) {
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continue;
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}
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add2repl(repl, c);
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}
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c = GetChar();
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while(in_idf(c) || c == '.') {
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add2repl(repl, c);
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if((c = GetChar()) == 'e' || c == 'E') {
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add2repl(repl, c);
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c = GetChar();
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if (c == '+' || c == '-') {
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add2repl(repl, c);
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c = GetChar();
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}
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}
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}
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} else {
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if (blank) {
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blank = 0;
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add2repl(repl, ' ');
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}
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add2repl(repl, c);
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c = GetChar();
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}
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}
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*length = repl->r_ptr - repl->r_text;
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return Realloc(repl->r_text, (unsigned)(repl->r_ptr - repl->r_text +1));
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}
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/* macroeq() decides whether two macro replacement texts are
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identical. This version compares the texts, which occur
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as strings, without taking care of the leading and trailing
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blanks (spaces and tabs).
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*/
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macroeq(s, t)
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register char *s, *t;
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{
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/* skip leading spaces */
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while (BLANK(*s)) s++;
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while (BLANK(*t)) t++;
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/* first non-blank encountered in both strings */
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/* The actual comparison loop: */
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while (*s && *s == *t)
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s++, t++;
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/* two cases are possible when arrived here: */
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if (*s == '\0') { /* *s == '\0' */
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while (BLANK(*t)) t++;
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return *t == '\0';
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}
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else { /* *s != *t */
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while (BLANK(*s)) s++;
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while (BLANK(*t)) t++;
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return (*s == '\0') && (*t == '\0');
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}
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}
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do_line(l)
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unsigned int l;
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{
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struct token tk;
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int t = GetToken(&tk);
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if (t != EOF) SkipToNewLine();
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LineNumber = l; /* the number of the next input line */
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if (t == STRING) /* is there a filespecifier? */
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FileName = tk.tk_str;
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}
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