c.c

早期freebsd实现

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)c.c	5.10 (Berkeley) 6/1/90";
#endif /* not lint */

/*
 * C-dependent symbol routines.
 */

#include "defs.h"
#include "symbols.h"
#include "printsym.h"
#include "languages.h"
#include "c.h"
#include "tree.h"
#include "eval.h"
#include "operators.h"
#include "mappings.h"
#include "process.h"
#include "runtime.h"
#include "machine.h"

#ifndef public
#   include "tree.h"
#endif

#define isdouble(range) ( \
    range->symvalue.rangev.upper == 0 and range->symvalue.rangev.lower > 0 \
)

#define isrange(t, name) (t->class == RANGE and istypename(t->type, name))

private Language langC;
private Language langCplpl;

/*
 * Initialize C language information.
 */

public c_init()
{
    langC = language_define("c", ".c");
    language_setop(langC, L_PRINTDECL, c_printdecl);
    language_setop(langC, L_PRINTVAL, c_printval);
    language_setop(langC, L_TYPEMATCH, c_typematch);
    language_setop(langC, L_BUILDAREF, c_buildaref);
    language_setop(langC, L_EVALAREF, c_evalaref);
    language_setop(langC, L_MODINIT, c_modinit);
    language_setop(langC, L_HASMODULES, c_hasmodules);
    language_setop(langC, L_PASSADDR, c_passaddr);

    langCplpl = language_define("c++", "..c");
    language_setop(langCplpl, L_PRINTDECL, c_printdecl);
    language_setop(langCplpl, L_PRINTVAL, c_printval);
    language_setop(langCplpl, L_TYPEMATCH, c_typematch);
    language_setop(langCplpl, L_BUILDAREF, c_buildaref);
    language_setop(langCplpl, L_EVALAREF, c_evalaref);
    language_setop(langCplpl, L_MODINIT, c_modinit);
    language_setop(langCplpl, L_HASMODULES, c_hasmodules);
    language_setop(langCplpl, L_PASSADDR, c_passaddr);
}

/*
 * Test if two types are compatible.
 */

public Boolean c_typematch(type1, type2)
Symbol type1, type2;
{
    Boolean b;
    register Symbol t1, t2, tmp;

    t1 = type1;
    t2 = type2;
    if (t1 == t2) {
	b = true;
    } else {
	t1 = rtype(t1);
	t2 = rtype(t2);
	if (t1 == t_char->type or t1 == t_int->type or t1 == t_real->type) {
	    tmp = t1;
	    t1 = t2;
	    t2 = tmp;
	}
	b = (Boolean) (
	    (
		isrange(t1, "int") and !isdouble(t1) /* sigh */ and
		(t2 == t_int->type or t2 == t_char->type)
	    ) or (
		isrange(t1, "char") and
		(t2 == t_char->type or t2 == t_int->type)
	    ) or (
		t1->class == RANGE and isdouble(t1) and t2 == t_real->type
	    ) or (
		t1->class == RANGE and t2->class == RANGE and
		t1->symvalue.rangev.lower == t2->symvalue.rangev.lower and
		t1->symvalue.rangev.upper == t2->symvalue.rangev.upper
	    ) or (
		t1->class != RANGE and t1->type == t2->type and (
		    (t1->class == t2->class) or
		    (t1->class == SCAL and t2->class == CONST) or
		    (t1->class == CONST and t2->class == SCAL)
		)
	    ) or (
		t1->class == PTR and c_typematch(t1->type, t_char) and
		t2->class == ARRAY and c_typematch(t2->type, t_char) and
		t2->language == primlang
	    )
	);
    }
    return b;
}

/*
 * Print out the declaration of a C variable.
 */

public c_printdecl(s)
Symbol s;
{
    printdecl(s, 0);
}

private printdecl(s, indent)
register Symbol s;
Integer indent;
{
    register Symbol t;
    Boolean semicolon, newline;

    semicolon = true;
    newline = true;
    if (indent > 0) {
	printf("%*c", indent, ' ');
    }
    if (s->class == TYPE) {
	printf("typedef ");
    }
    switch (s->class) {
	case CONST:
	    if (s->type->class == SCAL) {
		printf("enumeration constant with value ");
		eval(s->symvalue.constval);
		c_printval(s);
	    } else {
		printf("const %s = ", symname(s));
		printval(s);
	    }
	    break;

	case TYPE:
	case VAR:
	    if (s->class != TYPE and s->storage == INREG) {
		printf("register ");
	    }
	    if (s->type->class == ARRAY) {
		printtype(s->type, s->type->type, indent);
		t = rtype(s->type->chain);
		assert(t->class == RANGE);
		printf(" %s[%d]", symname(s), t->symvalue.rangev.upper + 1);
	    } else {
		printtype(s, s->type, indent);
		if (s->type->class != PTR) {
		    printf(" ");
		}
		printf("%s", symname(s));
	    }
	    break;

	case FIELD:
	    if (s->type->class == ARRAY) {
		printtype(s->type, s->type->type, indent);
		t = rtype(s->type->chain);
		assert(t->class == RANGE);
		printf(" %s[%d]", symname(s), t->symvalue.rangev.upper + 1);
	    } else {
		printtype(s, s->type, indent);
		if (s->type->class != PTR) {
		    printf(" ");
		}
		printf("%s", symname(s));
	    }
	    if (isbitfield(s)) {
		printf(" : %d", s->symvalue.field.length);
	    }
	    break;

	case TAG:
	    if (s->type == nil) {
		findtype(s);
		if (s->type == nil) {
		    error("unexpected missing type information");
		}
	    }
	    printtype(s, s->type, indent);
	    break;

	case RANGE:
	case ARRAY:
	case RECORD:
	case VARNT:
	case PTR:
	case FFUNC:
	    semicolon = false;
	    printtype(s, s, indent);
	    break;

	case SCAL:
	    printf("(enumeration constant, value %d)", s->symvalue.iconval);
	    break;

	case PROC:
	    semicolon = false;
	    printf("%s", symname(s));
	    c_listparams(s);
	    newline = false;
	    break;

	case FUNC:
	    semicolon = false;
	    if (not istypename(s->type, "void")) {
		printtype(s, s->type, indent);
		printf(" ");
	    }
	    printf("%s", symname(s));
	    c_listparams(s);
	    newline = false;
	    break;

	case MODULE:
	    semicolon = false;
	    printf("source file \"%s.c\"", symname(s));
	    break;

	case PROG:
	    semicolon = false;
	    printf("executable file \"%s\"", symname(s));
	    break;

	default:
	    printf("[%s]", classname(s));
	    break;
    }
    if (semicolon) {
	putchar(';');
    }
    if (newline) {
	putchar('\n');
    }
}

/*
 * Recursive whiz-bang procedure to print the type portion
 * of a declaration.
 *
 * The symbol associated with the type is passed to allow
 * searching for type names without getting "type blah = blah".
 */

private printtype(s, t, indent)
Symbol s;
Symbol t;
Integer indent;
{
    register Symbol i;
    long r0, r1;
    register String p;

    checkref(s);
    checkref(t);
    switch (t->class) {
	case VAR:
	case CONST:
	case PROC:
	    panic("printtype: class %s", classname(t));
	    break;

	case ARRAY:
	    printf("array[");
	    i = t->chain;
	    if (i != nil) {
		for (;;) {
		    printtype(i, i, indent);
		    i = i->chain;
		    if (i == nil) {
			break;
		    }
		    printf(", ");
		}
	    }
	    printf("] of ");
	    printtype(t, t->type, indent);
	    break;

	case RECORD:
	case VARNT:
	    printf("%s ", c_classname(t));
	    if (s->name != nil and s->class == TAG) {
		p = symname(s);
		if (p[0] == '$' and p[1] == '$') {
		    printf("%s ", &p[2]);
		} else {
		    printf("%s ", p);
		}
	    }
	    printf("{\n");
	    for (i = t->chain; i != nil; i = i->chain) {
		assert(i->class == FIELD);
		printdecl(i, indent+4);
	    }
	    if (indent > 0) {
		printf("%*c", indent, ' ');
	    }
	    printf("}");
	    break;

	case RANGE:
	    r0 = t->symvalue.rangev.lower;
	    r1 = t->symvalue.rangev.upper;
	    if (istypename(t->type, "char")) {
		if (r0 < 0x20 or r0 > 0x7e) {
		    printf("%ld..", r0);
		} else {
		    printf("'%c'..", (char) r0);
		}
		if (r1 < 0x20 or r1 > 0x7e) {
		    printf("\\%lo", r1);
		} else {
		    printf("'%c'", (char) r1);
		}
	    } else if (r0 > 0 and r1 == 0) {
		printf("%ld byte real", r0);
	    } else if (r0 >= 0) {
		printf("%lu..%lu", r0, r1);
	    } else {
		printf("%ld..%ld", r0, r1);
	    }
	    break;

	case PTR:
	    printtype(t, t->type, indent);
	    if (t->type->class != PTR) {
		printf(" ");