asm/error.c

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 1996-2018 The NASM Authors - All Rights Reserved
 *   See the file AUTHORS included with the NASM distribution for
 *   the specific copyright holders.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following
 *   conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * 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.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 *
 * ----------------------------------------------------------------------- */

/*
 * error.c - error message handling routines for the assembler
 */

#include "compiler.h"

#include <stdlib.h>

#include "nasmlib.h"
#include "error.h"

/*
 * Description of the suppressible warnings for the command line and
 * the [warning] directive.
 */
#define on	(WARN_ST_ENABLED)
#define off	0
#define err	(WARN_ST_ENABLED|WARN_ST_ERROR)

const struct warning warnings[WARN_ALL+1] = {
    {NULL, NULL, on},	/* must be on - used for unconditional enable */
    {"macro-params", "macro calls with wrong parameter count", on},
    {"macro-selfref", "cyclic macro references", off},
    {"macro-defaults", "macros with more default than optional parameters", on},
    {"orphan-labels", "labels alone on lines without trailing `:'", on},
    {"number-overflow", "numeric constant does not fit", on},
    {"gnu-elf-extensions", "using 8- or 16-bit relocation in ELF32, a GNU extension", off},
    {"float-overflow", "floating point overflow", on},
    {"float-denorm", "floating point denormal", off},
    {"float-underflow", "floating point underflow", off},
    {"float-toolong", "too many digits in floating-point number", on},
    {"user", "%warning directives", on},
    {"lock", "lock prefix on unlockable instructions", on},
    {"hle", "invalid hle prefixes", on},
    {"bnd", "invalid bnd prefixes", on},
    {"zext-reloc", "relocation zero-extended to match output format", on},
    {"ptr", "non-NASM keyword used in other assemblers", on},
    {"bad-pragma", "empty or malformed %pragma", off},
    {"unknown-pragma", "unknown %pragma facility or directive", off},
    {"not-my-pragma", "%pragma not applicable to this compilation", off},
    {"unknown-warning", "unknown warning in -W/-w or warning directive", off},
    {"negative-rep", "regative %rep count", on},
    {"phase", "phase error during stabilization", off},
    {"label-redef", "label redefined to an identical value", off},
    {"label-redef-late", "label (re)defined during code generation", err},

    /* THESE ENTRIES SHOULD COME LAST */
    {"other", "any warning not specifially mentioned above", on},
    {"all", "all possible warnings", off}
};

uint8_t warning_state[WARN_ALL];/* Current state */
uint8_t warning_state_init[WARN_ALL]; /* Command-line state, for reset */

/* Global error handling function */
vefunc nasm_verror;

/* Common function body */
#define nasm_do_error(s)			\
	va_list ap;				\
        va_start(ap, fmt);                      \
	nasm_verror((s), fmt, ap);		\
	va_end(ap);

void nasm_error(int severity, const char *fmt, ...)
{
	nasm_do_error(severity);
}

#define nasm_err_helpers(_type, _name, _sev)				\
_type nasm_ ## _name ## f (int flags, const char *fmt, ...)		\
{									\
	nasm_do_error((_sev)|flags);					\
	if (_sev >= ERR_FATAL)						\
		abort();						\
}									\
_type nasm_ ## _name (const char *fmt, ...)				\
{									\
	nasm_do_error(_sev);						\
	if (_sev >= ERR_FATAL)						\
		abort();						\
}

nasm_err_helpers(void,       debug,    ERR_DEBUG)
nasm_err_helpers(void,       note,     ERR_NOTE)
nasm_err_helpers(void,       warn,     ERR_WARNING)
nasm_err_helpers(void,       nonfatal, ERR_NONFATAL)
nasm_err_helpers(fatal_func, fatal,    ERR_FATAL)
nasm_err_helpers(fatal_func, panic,    ERR_PANIC)

fatal_func nasm_panic_from_macro(const char *file, int line)
{
	nasm_panic("internal error at %s:%d\n", file, line);
}

fatal_func nasm_assert_failed(const char *file, int line, const char *msg)
{
	nasm_panic("assertion %s failed at %s:%d", msg, file, line);
}

/*
 * This is called when processing a -w or -W option, or a warning directive.
 * Returns on if if the action was successful.
 */
bool set_warning_status(const char *value)
{
	enum warn_action { WID_OFF, WID_ON, WID_RESET };
	enum warn_action action;
	bool ok = false;
	uint8_t mask;
	int i;

	value = nasm_skip_spaces(value);
	switch (*value) {
	case '-':
		action = WID_OFF;
		value++;
		break;
	case '+':
		action = WID_ON;
		value++;
		break;
	case '*':
		action = WID_RESET;
		value++;
		break;
	case 'N':
	case 'n':
		if (!nasm_strnicmp(value, "no-", 3)) {
			action = WID_OFF;
			value += 3;
			break;
		} else if (!nasm_stricmp(value, "none")) {
			action = WID_OFF;
			value = NULL;
			break;
		}
		/* else fall through */
	default:
		action = WID_ON;
		break;
	}

	mask = WARN_ST_ENABLED;

	if (value && !nasm_strnicmp(value, "error", 5)) {
		switch (value[5]) {
		case '=':
			mask = WARN_ST_ERROR;
			value += 6;
			break;
		case '\0':
			mask = WARN_ST_ERROR;
			value = NULL;
			break;
		default:
			/* Just an accidental prefix? */
			break;
		}
	}

	if (value && !nasm_stricmp(value, "all"))
		value = NULL;

	/* This is inefficient, but it shouldn't matter... */
	for (i = 0; i < WARN_ALL; i++) {
		if (!value || !nasm_stricmp(value, warnings[i].name)) {
			ok = true; /* At least one action taken */
			switch (action) {
			case WID_OFF:
				warning_state[i] &= ~mask;
				break;
			case WID_ON:
				warning_state[i] |= mask;
				break;
			case WID_RESET:
				warning_state[i] &= ~mask;
				warning_state[i] |= warning_state_init[i] & mask;
				break;
			}
		}
	}

	return ok;
}