+++ /dev/null
-/*
- * Generate random C declarations for testing.
- * Copyright © 2012, 2021-2022 Nick Bowler
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <errno.h>
-#include <assert.h>
-#include <stdbool.h>
-
-#include "declgen.h"
-#include "cdecl.h"
-#include "test.h"
-
-/*
- * Return a newly-allocated null declarator. The child member is set by the
- * argument; other members are initialized to zero.
- */
-struct cdecl_declarator *new_declarator(struct cdecl_declarator *child)
-{
- struct cdecl_declarator *d, init = { child, CDECL_DECL_NULL };
-
- d = malloc_nofail(sizeof *d);
- *d = init;
-
- return d;
-}
-
-/*
- * Return a newly-allocated void specifier. The next member is set by the
- * argument; other members are initialized to zero.
- */
-struct cdecl_declspec *new_specifier(struct cdecl_declspec *next)
-{
- struct cdecl_declspec *d, init = { next, CDECL_TYPE_VOID };
-
- d = malloc_nofail(sizeof *d);
- *d = init;
-
- return d;
-}
-
-/*
- * Return a newly-allocated declaration. The next member is set by the
- * argument; other members are initialized to zero.
- */
-struct cdecl *new_cdecl(struct cdecl *next)
-{
- struct cdecl *d, init = { next };
-
- d = malloc_nofail(sizeof *d);
- *d = init;
-
- return d;
-}
-
-/*
- * Generate a random identifier. We arbitrarily pick 10 as the largest
- * possible. Avoid generating keywords, including the English ones, by
- * excluding the letters t, o, a and n. Reserved words are OK.
- */
-char *gen_identifier(struct test_rng *rng)
-{
- static const char valid[59] = "_bcdefghijklmpqrsuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
- char *str;
- size_t n;
-
- n = test_rng_uniform_int(rng, 10)+1;
- str = malloc_nofail(n+1);
-
- /* Exclude 10 digits from the first character. */
- str[0] = valid[test_rng_uniform_int(rng, sizeof valid - 10)];
- for (size_t i = 1; i < n; i++)
- str[i] = valid[test_rng_uniform_int(rng, sizeof valid)];
- str[n] = 0;
-
- return str;
-}
-
-/*
- * Generate random qualifiers. Qualifiers can appear multiple times, so the
- * list is (potentially) unbounded. We handle the potential unboundedness by
- * generating a list of n qualifiers with probability 1/2^(n+1). Each
- * qualifier is chosen uniformly at random from the set of possibilities:
- * const, volatile and, if restrictqual is true, restrict.
- */
-struct cdecl_declspec *gen_qualifiers(struct test_rng *rng, bool restrictqual)
-{
- struct cdecl_declspec *s = NULL;
-
- while (test_rng_uniform(rng) < 0.5) {
- s = new_specifier(s);
-
- switch (test_rng_uniform_int(rng, 2+restrictqual)) {
- case 0:
- s->type = CDECL_QUAL_CONST;
- break;
- case 1:
- s->type = CDECL_QUAL_VOLATILE;
- break;
- case 2: /* Only if restrictqual is true. */
- s->type = CDECL_QUAL_RESTRICT;
- break;
- default:
- assert(0);
- }
- }
-
- return s;
-}
-
-/*
- * Generate random function specifiers. Like qualifiers, function specifiers
- * can appear multiple times.
- */
-struct cdecl_declspec *gen_funcspecs(struct test_rng *rng)
-{
- struct cdecl_declspec *s = NULL;
-
- while (test_rng_uniform(rng) < 0.5) {
- s = new_specifier(s);
- s->type = CDECL_FUNC_INLINE;
- }
-
- return s;
-}
-
-/*
- * Generate zero or one random storage-class specifier. If registeronly is
- * true, then the only possible storage-class specifier is "register".
- * Otherwise, a specifier type will be selected uniformly at random.
- */
-struct cdecl_declspec *gen_storspecs(struct test_rng *rng, bool registeronly)
-{
- struct cdecl_declspec *s;
-
- if (test_rng_uniform(rng) < 0.5)
- return NULL;
-
- s = new_specifier(NULL);
- switch (test_rng_uniform_int(rng, registeronly ? 1 : 5)) {
- case 0: s->type = CDECL_STOR_REGISTER; break;
- case 1: s->type = CDECL_STOR_TYPEDEF; break;
- case 2: s->type = CDECL_STOR_STATIC; break;
- case 3: s->type = CDECL_STOR_AUTO; break;
- case 4: s->type = CDECL_STOR_EXTERN; break;
- default: assert(0);
- }
-
- return s;
-}
-
-/*
- * Generate random type specifiers. There is a short list of valid
- * combinations, from which we can select one uniformly at random.
- */
-#include "typegen.h"
-
-struct cdecl_declspec *gen_typespecs(struct test_rng *rng, bool voidtype)
-{
- struct cdecl_declspec *specs;
-
-retry:
- specs = gen_raw_typespecs(test_rng_uniform_int(rng, GEN_TOTAL_TYPES));
-
- switch (specs->type) {
- /* void is not always valid, so we might need to pick again. */
- case CDECL_TYPE_VOID:
- if (!voidtype) {
- assert(!specs->next);
- free(specs);
- goto retry;
- }
- break;
- /* A few kinds of type specifiers need identifiers to go with them. */
- case CDECL_TYPE_STRUCT:
- case CDECL_TYPE_UNION:
- case CDECL_TYPE_ENUM:
- case CDECL_TYPE_IDENT:
- assert(!specs->next);
- specs->ident = gen_identifier(rng);
- break;
- default:
- /* Nothing to be done. */
- ;
- }
-
- return specs;
-}
-
-struct cdecl_declspec *
-gen_randomize_specs(struct test_rng *rng, struct cdecl_declspec *specs)
-{
- struct cdecl_declspec **p;
- size_t n = 0;
-
- if (!specs)
- return specs;
-
- for (struct cdecl_declspec *s = specs; s; s = s->next)
- n++;
-
- p = malloc_nofail((n+1) * sizeof *p);
-
- /* Build a temporary array for easy element swapping. */
- p[0] = specs;
- p[n] = NULL;
- for (size_t i = 1; i < n; i++)
- p[i] = p[i-1]->next;
-
- /* Knuth shuffle. */
- for (size_t i = 0; i < n; i++) {
- struct cdecl_declspec *tmp;
- size_t r;
-
- r = test_rng_uniform_int(rng, n-i);
- tmp = p[i];
- p[i] = p[r+i];
- p[r+i] = tmp;
- }
-
- /* Fix up the pointers. */
- for (size_t i = 1; i <= n; i++)
- p[i-1]->next = p[i];
- specs = p[0];
-
- free(p);
- return specs;
-}
-
-/*
- * Generate random declaration specifiers. This consists of random qualifiers
- * and type specifiers, as described in the functions above, plus up to one
- * storage-class specifier and zero or more function specifiers.
- *
- * The flags parameter controls what sort of specifiers can be generated in
- * order to handle various special cases in the C language. It is the
- * bitwise-or of zero or more values, which have the following meanings:
- *
- * GEN_NO_FUNCTION: Do not generate any function specifiers at all.
- * GEN_NO_STORAGE: Do not generate any storage-class specifiers at all.
- * GEN_NO_VOID: Do not generate the "void" type specifier.
- * GEN_ONLY_REGISTER: Never generate any storage-class specifiers other than
- * "register".
- *
- * Notwithstanding any of the above, the "restrict" type qualifier will never
- * be generated by this function: use gen_qualifiers directly.
- */
-struct cdecl_declspec *
-gen_declspecs(struct test_rng *rng, unsigned flags)
-{
- struct cdecl_declspec *s, *p;
-
- s = gen_typespecs(rng, ~flags & GEN_NO_VOID);
- for (p = s; p->next;)
- p = p->next;
-
- if (~flags & GEN_NO_FUNCTION)
- p->next = gen_funcspecs(rng);
- for (p = s; p->next;)
- p = p->next;
-
- if (~flags & GEN_NO_STORAGE)
- p->next = gen_storspecs(rng, flags & GEN_ONLY_REGISTER);
- for (p = s; p->next;)
- p = p->next;
-
- p->next = gen_qualifiers(rng, false);
- return gen_randomize_specs(rng, s);
-}
-
-static uintmax_t gen_uintmax(struct test_rng *rng)
-{
- unsigned char tmp;
- uintmax_t ret = 0;
-
- for (size_t i = 0; i < sizeof ret; i++) {
- tmp = test_rng_uniform_int(rng, UCHAR_MAX+1);
- ret <<= CHAR_BIT;
- ret |= tmp;
- }
-
- return ret;
-}
-
-/*
- * Generate a random array declarator, selecting one of four possibilities
- * uniformly at random.
- */
-static void gen_array(struct test_rng *rng, struct cdecl_declarator *d)
-{
- struct cdecl_array tmp = {0};
-
- switch (test_rng_uniform_int(rng, 4)) {
- case 0:
- tmp.vla = malloc_nofail(1);
- tmp.vla[0] = 0;
- break;
- case 1:
- tmp.vla = gen_identifier(rng);
- break;
- case 2:
- tmp.length = gen_uintmax(rng);
- case 3:
- break;
- default:
- assert(0);
- }
-
- d->type = CDECL_DECL_ARRAY;
- d->u.array = tmp;
-}
-
-/* Generate a function declarator. */
-static void gen_function(struct test_rng *rng, struct cdecl_declarator *d)
-{
- d->type = CDECL_DECL_FUNCTION;
- d->u.function.parameters = NULL;
-
- while (test_rng_uniform(rng) < 0.5) {
- unsigned flags = GEN_ONLY_REGISTER | GEN_NO_FUNCTION;
- struct cdecl *param;
-
- param = new_cdecl(d->u.function.parameters);
- param->declarators = gen_declarators(rng);
-
- if (param->declarators->type != CDECL_DECL_POINTER
- && param->declarators->type != CDECL_DECL_FUNCTION)
- flags |= GEN_NO_VOID;
-
- param->specifiers = gen_declspecs(rng, flags);
- d->u.function.parameters = param;
- }
-
- if (d->u.function.parameters) {
- d->u.function.variadic = test_rng_uniform(rng) < 0.5;
- } else if (test_rng_uniform(rng) < 0.5) {
- struct cdecl *param;
-
- /* We will never generate (void) above; do it here. */
- param = new_cdecl(NULL);
- param->declarators = new_declarator(NULL);
- param->specifiers = new_specifier(NULL);
-
- d->u.function.parameters = param;
- }
-}
-
-/*
- * Generate a random chain of declarators. Like qualifiers above, a chain of
- * length N has probability 1/2^(N+1) of occurring. All declarator chains
- * are ultimately terminated by either a null declarator or an identifier,
- * selected uniformly at random.
- */
-struct cdecl_declarator *gen_declarators(struct test_rng *rng)
-{
- struct cdecl_declarator *d, *p;
- unsigned limit = 3;
-
- d = new_declarator(NULL);
- if (test_rng_uniform(rng) < 0.5) {
- d->type = CDECL_DECL_IDENT;
- d->u.ident = gen_identifier(rng);
- }
-
- while (test_rng_uniform(rng) < 0.5) {
- d = new_declarator((p = d));
-
- switch (test_rng_uniform_int(rng, limit)) {
- case 0:
- d->type = CDECL_DECL_POINTER;
- d->u.pointer.qualifiers = gen_qualifiers(rng, true);
- limit = 3;
- break;
- case 1:
- gen_array(rng, d);
- limit = 2;
- break;
- case 2:
- gen_function(rng, d);
- if (p && p->type == CDECL_DECL_POINTER) {
- struct cdecl_pointer *ptr = &p->u.pointer;
-
- gen_free_declspecs(ptr->qualifiers);
- ptr->qualifiers = gen_qualifiers(rng, false);
- }
- limit = 1;
- break;
- default:
- assert(0);
- }
- }
-
- return d;
-}
-
-static void gen_free_parameters(struct cdecl *x)
-{
- struct cdecl *p;
-
- while (x) {
- p = x->next;
-
- gen_free_declspecs(x->specifiers);
- gen_free_declarators(x->declarators);
- free(x);
-
- x = p;
- }
-}
-
-void gen_free_declspecs(struct cdecl_declspec *x)
-{
- struct cdecl_declspec *p;
-
- while (x) {
- p = x->next;
- free(x->ident);
- free(x);
- x = p;
- }
-}
-
-void gen_free_declarators(struct cdecl_declarator *x)
-{
- struct cdecl_declarator *p;
-
- while (x) {
- p = x->child;
-
- switch (x->type) {
- case CDECL_DECL_NULL:
- break;
- case CDECL_DECL_IDENT:
- free(x->u.ident);
- break;
- case CDECL_DECL_POINTER:
- gen_free_declspecs(x->u.pointer.qualifiers);
- break;
- case CDECL_DECL_ARRAY:
- free(x->u.array.vla);
- break;
- case CDECL_DECL_FUNCTION:
- gen_free_parameters(x->u.function.parameters);
- break;
- default:
- assert(0);
- }
-
- free(x);
- x = p;
- }
-}
projects / cdecl99.git / blobdiff