ref: 78e751f022a5aa3a6ffc4fd08a81fc408c5b70d4
dir: /src/asm/warning.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 2019, Eldred Habert and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "asm/fstack.h"
#include "asm/main.h"
#include "asm/warning.h"
#include "error.h"
unsigned int nbErrors = 0;
static const enum WarningState defaultWarnings[ARRAY_SIZE(warningStates)] = {
[WARNING_ASSERT] = WARNING_ENABLED,
[WARNING_BACKWARDS_FOR] = WARNING_DISABLED,
[WARNING_BUILTIN_ARG] = WARNING_DISABLED,
[WARNING_CHARMAP_REDEF] = WARNING_DISABLED,
[WARNING_DIV] = WARNING_DISABLED,
[WARNING_EMPTY_DATA_DIRECTIVE] = WARNING_DISABLED,
[WARNING_EMPTY_MACRO_ARG] = WARNING_DISABLED,
[WARNING_EMPTY_STRRPL] = WARNING_DISABLED,
[WARNING_LARGE_CONSTANT] = WARNING_DISABLED,
[WARNING_LONG_STR] = WARNING_DISABLED,
[WARNING_MACRO_SHIFT] = WARNING_DISABLED,
[WARNING_NESTED_COMMENT] = WARNING_ENABLED,
[WARNING_OBSOLETE] = WARNING_ENABLED,
[WARNING_SHIFT] = WARNING_DISABLED,
[WARNING_SHIFT_AMOUNT] = WARNING_DISABLED,
[WARNING_USER] = WARNING_ENABLED,
[WARNING_NUMERIC_STRING_1] = WARNING_ENABLED,
[WARNING_NUMERIC_STRING_2] = WARNING_DISABLED,
[WARNING_TRUNCATION_1] = WARNING_ENABLED,
[WARNING_TRUNCATION_2] = WARNING_DISABLED,
};
enum WarningState warningStates[ARRAY_SIZE(warningStates)];
bool warningsAreErrors; /* Set if `-Werror` was specified */
static enum WarningState warningState(enum WarningID id)
{
/* Check if warnings are globally disabled */
if (!warnings)
return WARNING_DISABLED;
/* Get the actual state */
enum WarningState state = warningStates[id];
if (state == WARNING_DEFAULT)
/* The state isn't set, grab its default state */
state = defaultWarnings[id];
if (warningsAreErrors && state == WARNING_ENABLED)
state = WARNING_ERROR;
return state;
}
static const char * const warningFlags[NB_WARNINGS] = {
"assert",
"backwards-for",
"builtin-args",
"charmap-redef",
"div",
"empty-data-directive",
"empty-macro-arg",
"empty-strrpl",
"large-constant",
"long-string",
"macro-shift",
"nested-comment",
"obsolete",
"shift",
"shift-amount",
"user",
// Parametric warnings
"numeric-string",
"numeric-string",
"truncation",
"truncation",
/* Meta warnings */
"all",
"extra",
"everything", /* Especially useful for testing */
};
static const struct {
char const *name;
uint8_t nbLevels;
uint8_t defaultLevel;
} paramWarnings[] = {
{ "numeric-string", 2, 1 },
{ "truncation", 2, 2 },
};
static bool tryProcessParamWarning(char const *flag, uint8_t param, enum WarningState state)
{
enum WarningID baseID = PARAM_WARNINGS_START;
for (size_t i = 0; i < ARRAY_SIZE(paramWarnings); i++) {
uint8_t maxParam = paramWarnings[i].nbLevels;
if (!strcmp(paramWarnings[i].name, flag)) { // Match!
// If making the warning an error but param is 0, set to the maximum
// This accommodates `-Werror=flag`, but also `-Werror=flag=0`, which is
// thus filtered out by the caller.
// A param of 0 makes sense for disabling everything, but neither for
// enabling nor "erroring". Use the default for those.
if (param == 0 && state != WARNING_DISABLED) {
param = paramWarnings[i].defaultLevel;
} else if (param > maxParam) {
if (param != 255) // Don't warn if already capped
warnx("Got parameter %" PRIu8
" for warning flag \"%s\", but the maximum is %"
PRIu8 "; capping.\n",
param, flag, maxParam);
param = maxParam;
}
// Set the first <param> to enabled/error, and disable the rest
for (uint8_t ofs = 0; ofs < maxParam; ofs++) {
warningStates[baseID + ofs] =
ofs < param ? state : WARNING_DISABLED;
}
return true;
}
baseID += maxParam;
}
return false;
}
enum MetaWarningCommand {
META_WARNING_DONE = NB_WARNINGS
};
/* Warnings that probably indicate an error */
static uint8_t const _wallCommands[] = {
WARNING_BACKWARDS_FOR,
WARNING_BUILTIN_ARG,
WARNING_CHARMAP_REDEF,
WARNING_EMPTY_DATA_DIRECTIVE,
WARNING_EMPTY_STRRPL,
WARNING_LARGE_CONSTANT,
WARNING_LONG_STR,
WARNING_NESTED_COMMENT,
WARNING_OBSOLETE,
WARNING_NUMERIC_STRING_1,
META_WARNING_DONE
};
/* Warnings that are less likely to indicate an error */
static uint8_t const _wextraCommands[] = {
WARNING_EMPTY_MACRO_ARG,
WARNING_MACRO_SHIFT,
WARNING_NESTED_COMMENT,
WARNING_OBSOLETE,
WARNING_NUMERIC_STRING_2,
WARNING_TRUNCATION_1,
WARNING_TRUNCATION_2,
META_WARNING_DONE
};
/* Literally everything. Notably useful for testing */
static uint8_t const _weverythingCommands[] = {
WARNING_BACKWARDS_FOR,
WARNING_BUILTIN_ARG,
WARNING_DIV,
WARNING_EMPTY_DATA_DIRECTIVE,
WARNING_EMPTY_MACRO_ARG,
WARNING_EMPTY_STRRPL,
WARNING_LARGE_CONSTANT,
WARNING_LONG_STR,
WARNING_MACRO_SHIFT,
WARNING_NESTED_COMMENT,
WARNING_OBSOLETE,
WARNING_SHIFT,
WARNING_SHIFT_AMOUNT,
WARNING_NUMERIC_STRING_1,
WARNING_NUMERIC_STRING_2,
WARNING_TRUNCATION_1,
WARNING_TRUNCATION_2,
/* WARNING_USER, */
META_WARNING_DONE
};
static uint8_t const *metaWarningCommands[NB_META_WARNINGS] = {
_wallCommands,
_wextraCommands,
_weverythingCommands
};
void processWarningFlag(char *flag)
{
static bool setError = false;
/* First, try to match against a "meta" warning */
for (enum WarningID id = META_WARNINGS_START; id < NB_WARNINGS; id++) {
/* TODO: improve the matching performance? */
if (!strcmp(flag, warningFlags[id])) {
/* We got a match! */
if (setError)
errx("Cannot make meta warning \"%s\" into an error",
flag);
for (uint8_t const *ptr = metaWarningCommands[id - META_WARNINGS_START];
*ptr != META_WARNING_DONE; ptr++) {
/* Warning flag, set without override */
if (warningStates[*ptr] == WARNING_DEFAULT)
warningStates[*ptr] = WARNING_ENABLED;
}
return;
}
}
/* If it's not a meta warning, specially check against `-Werror` */
if (!strncmp(flag, "error", strlen("error"))) {
char *errorFlag = flag + strlen("error");
switch (*errorFlag) {
case '\0':
/* `-Werror` */
warningsAreErrors = true;
return;
case '=':
/* `-Werror=XXX` */
setError = true;
processWarningFlag(errorFlag + 1); /* Skip the `=` */
setError = false;
return;
/* Otherwise, allow parsing as another flag */
}
}
/* Well, it's either a normal warning or a mistake */
enum WarningState state = setError ? WARNING_ERROR :
/* Not an error, then check if this is a negation */
strncmp(flag, "no-", strlen("no-")) ? WARNING_ENABLED
: WARNING_DISABLED;
char const *rootFlag = state == WARNING_DISABLED ? flag + strlen("no-") : flag;
// Is this a "parametric" warning?
if (state != WARNING_DISABLED) { // The `no-` form cannot be parametrized
// First, check if there is an "equals" sign followed by a decimal number
char *equals = strchr(rootFlag, '=');
if (equals && equals[1] != '\0') { // Ignore an equal sign at the very end as well
// Is the rest of the string a decimal number?
// We want to avoid `strtoul`'s whitespace and sign, so we parse manually
uint8_t param = 0;
char const *ptr = equals + 1;
bool warned = false;
// The `if`'s condition above ensures that this will run at least once
do {
// If we don't have a digit, bail
if (*ptr < '0' || *ptr > '9')
break;
// Avoid overflowing!
if (param > UINT8_MAX - (*ptr - '0')) {
if (!warned)
warnx("Invalid warning flag \"%s\": capping parameter at 255\n",
flag);
warned = true; // Only warn once, cap always
param = 255;
continue;
}
param = param * 10 + (*ptr - '0');
ptr++;
} while (*ptr);
// If we managed to the end of the string, check that the warning indeed
// accepts a parameter
if (*ptr == '\0') {
if (setError && param == 0) {
warnx("Ignoring nonsensical warning flag \"%s\"\n", flag);
return;
}
*equals = '\0'; // Truncate the param at the '='
if (tryProcessParamWarning(rootFlag, param,
param == 0 ? WARNING_DISABLED : state))
return;
}
}
}
/* Try to match the flag against a "normal" flag */
for (enum WarningID id = 0; id < NB_PLAIN_WARNINGS; id++) {
if (!strcmp(rootFlag, warningFlags[id])) {
/* We got a match! */
warningStates[id] = state;
return;
}
}
// Lastly, this might be a "parametric" warning without an equals sign
// If it is, treat the param as 1 if enabling, or 0 if disabling
if (tryProcessParamWarning(rootFlag, 0, state))
return;
warnx("Unknown warning `%s`", flag);
}
void printDiag(char const *fmt, va_list args, char const *type,
char const *flagfmt, char const *flag)
{
fputs(type, stderr);
fstk_DumpCurrent();
fprintf(stderr, flagfmt, flag);
vfprintf(stderr, fmt, args);
lexer_DumpStringExpansions();
}
void error(char const *fmt, ...)
{
va_list args;
va_start(args, fmt);
printDiag(fmt, args, "error: ", ":\n ", NULL);
va_end(args);
nbErrors++;
}
_Noreturn void fatalerror(char const *fmt, ...)
{
va_list args;
va_start(args, fmt);
printDiag(fmt, args, "FATAL: ", ":\n ", NULL);
va_end(args);
exit(1);
}
void warning(enum WarningID id, char const *fmt, ...)
{
char const *flag = warningFlags[id];
va_list args;
va_start(args, fmt);
switch (warningState(id)) {
case WARNING_DISABLED:
return;
case WARNING_ERROR:
printDiag(fmt, args, "error: ", ": [-Werror=%s]\n ", flag);
va_end(args);
return;
case WARNING_DEFAULT:
unreachable_();
/* Not reached */
case WARNING_ENABLED:
break;
}
printDiag(fmt, args, "warning: ", ": [-W%s]\n ", flag);
va_end(args);
}