asm.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*#@(#)asm.c	4.1	Ultrix	7/17/90*/
/* Copyright (c) 1982 Regents of the University of California */

static char sccsid[] = "@(#)asm.c 1.2 12/15/82";

static char rcsid[] = "$Header: asm.c,v 1.3 84/03/27 10:19:36 linton Exp $";

/*
 * Assembly language dependent symbol routines.
 */

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

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

/*
 * Initialize assembly language information.
 */

public asm_init()
{
    Language lang;

    lang = language_define("assembler", ".s");
    language_setop(lang, L_PRINTDECL, asm_printdecl);
    language_setop(lang, L_PRINTVAL, asm_printval);
    language_setop(lang, L_TYPEMATCH, asm_typematch);
    language_setop(lang, L_HASMODULES, asm_hasmodules);
    language_setop(lang, L_PASSADDR, asm_passaddr);
}

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

public Boolean asm_typematch(type1, type2)
Symbol type1, type2;
{
    Boolean b;

    b = false;
    return b;
}

public asm_printdecl(s)
Symbol s;
{
    switch (s->class) {
	case VAR:
	case REF:
	    printf("&%s = 0x%x", symname(s), s->symvalue.offset);
	    break;

	case PROC:
	case FUNC:
	    printf("%s (0x%x):", symname(s), codeloc(s));
	    break;

	default:
	    error("class %s in c_printdecl", classname(s));
    }
    putchar('\n');
}

/*
 * Print out the value on the top of the expression stack
 * in the format for the type of the given symbol.
 */

public asm_printval(s)
register Symbol s;
{
    register Symbol t;
    register Integer len;

    switch (s->class) {
	case ARRAY:
	    t = rtype(s->type);
	    if (t->class == RANGE and istypename(t->type, "$char")) {
		len = size(s);
		sp -= len;
		printf("\"%.*s\"", len, sp);
	    } else {
		printarray(s);
	    }
	    break;

	default:
	    printf("0x%x", pop(Integer));
	    break;
    }
}

public boolean asm_hasmodules ()
{
    return false;
}

public boolean asm_passaddr (param, exprtype)
Symbol param, exprtype;
{
    return false;
}