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mojoshader_preprocessor.c
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/**
* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
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#if DEBUG_PREPROCESSOR
#define print_debug_token(token, len, val) \
MOJOSHADER_print_debug_token("PREPROCESSOR", token, len, val)
#else
#define print_debug_token(token, len, val)
#endif
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#if DEBUG_LEXER
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static Token debug_preprocessor_lexer(IncludeState *s)
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{
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const Token retval = preprocessor_lexer(s);
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MOJOSHADER_print_debug_token("LEXER", s->token, s->tokenlen, retval);
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return retval;
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} // debug_preprocessor_lexer
#define preprocessor_lexer(s) debug_preprocessor_lexer(s)
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#endif
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typedef struct DefineHash
{
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const char *identifier;
const char *definition;
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struct DefineHash *next;
} DefineHash;
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// Simple linked list to cache source filenames, so we don't have to copy
// the same string over and over for each opcode.
typedef struct FilenameCache
{
char *filename;
struct FilenameCache *next;
} FilenameCache;
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typedef struct Context
{
int isfail;
int out_of_memory;
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char failstr[256];
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Conditional *conditional_pool;
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IncludeState *include_stack;
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IncludeState *include_pool;
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DefineHash *define_hashtable[256];
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DefineHash *define_pool;
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FilenameCache *filename_cache;
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MOJOSHADER_includeOpen open_callback;
MOJOSHADER_includeClose close_callback;
MOJOSHADER_malloc malloc;
MOJOSHADER_free free;
void *malloc_data;
} Context;
// Convenience functions for allocators...
static inline void out_of_memory(Context *ctx)
{
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ctx->out_of_memory = 1;
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} // out_of_memory
static inline void *Malloc(Context *ctx, const size_t len)
{
void *retval = ctx->malloc((int) len, ctx->malloc_data);
if (retval == NULL)
out_of_memory(ctx);
return retval;
} // Malloc
static inline void Free(Context *ctx, void *ptr)
{
if (ptr != NULL) // check for NULL in case of dumb free() impl.
ctx->free(ptr, ctx->malloc_data);
} // Free
static inline char *StrDup(Context *ctx, const char *str)
{
char *retval = (char *) Malloc(ctx, strlen(str) + 1);
if (retval != NULL)
strcpy(retval, str);
return retval;
} // StrDup
static void failf(Context *ctx, const char *fmt, ...) ISPRINTF(2,3);
static void failf(Context *ctx, const char *fmt, ...)
{
ctx->isfail = 1;
va_list ap;
va_start(ap, fmt);
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vsnprintf(ctx->failstr, sizeof (ctx->failstr), fmt, ap);
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va_end(ap);
} // failf
static inline void fail(Context *ctx, const char *reason)
{
failf(ctx, "%s", reason);
} // fail
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#if DEBUG_TOKENIZER
void MOJOSHADER_print_debug_token(const char *subsystem, const char *token,
const unsigned int tokenlen,
const Token tokenval)
{
printf("%s TOKEN: \"", subsystem);
unsigned int i;
for (i = 0; i < tokenlen; i++)
{
if (token[i] == '\n')
printf("\\n");
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else if (token[i] == '\\')
printf("\\\\");
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else
printf("%c", token[i]);
} // for
printf("\" (");
switch (tokenval)
{
#define TOKENCASE(x) case x: printf("%s", #x); break
TOKENCASE(TOKEN_UNKNOWN);
TOKENCASE(TOKEN_IDENTIFIER);
TOKENCASE(TOKEN_INT_LITERAL);
TOKENCASE(TOKEN_FLOAT_LITERAL);
TOKENCASE(TOKEN_STRING_LITERAL);
TOKENCASE(TOKEN_ADDASSIGN);
TOKENCASE(TOKEN_SUBASSIGN);
TOKENCASE(TOKEN_MULTASSIGN);
TOKENCASE(TOKEN_DIVASSIGN);
TOKENCASE(TOKEN_MODASSIGN);
TOKENCASE(TOKEN_XORASSIGN);
TOKENCASE(TOKEN_ANDASSIGN);
TOKENCASE(TOKEN_ORASSIGN);
TOKENCASE(TOKEN_INCREMENT);
TOKENCASE(TOKEN_DECREMENT);
TOKENCASE(TOKEN_RSHIFT);
TOKENCASE(TOKEN_LSHIFT);
TOKENCASE(TOKEN_ANDAND);
TOKENCASE(TOKEN_OROR);
TOKENCASE(TOKEN_LEQ);
TOKENCASE(TOKEN_GEQ);
TOKENCASE(TOKEN_EQL);
TOKENCASE(TOKEN_NEQ);
TOKENCASE(TOKEN_HASHHASH);
TOKENCASE(TOKEN_PP_INCLUDE);
TOKENCASE(TOKEN_PP_LINE);
TOKENCASE(TOKEN_PP_DEFINE);
TOKENCASE(TOKEN_PP_UNDEF);
TOKENCASE(TOKEN_PP_IF);
TOKENCASE(TOKEN_PP_IFDEF);
TOKENCASE(TOKEN_PP_IFNDEF);
TOKENCASE(TOKEN_PP_ELSE);
TOKENCASE(TOKEN_PP_ELIF);
TOKENCASE(TOKEN_PP_ENDIF);
TOKENCASE(TOKEN_PP_ERROR);
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TOKENCASE(TOKEN_INCOMPLETE_COMMENT);
TOKENCASE(TOKEN_BAD_CHARS);
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TOKENCASE(TOKEN_EOI);
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TOKENCASE(TOKEN_PREPROCESSING_ERROR);
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#undef TOKENCASE
case ((Token) '\n'):
printf("'\\n'");
break;
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case ((Token) '\\'):
printf("'\\\\'");
break;
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default:
assert(((int)tokenval) < 256);
printf("'%c'", (char) tokenval);
break;
} // switch
printf(")\n");
} // MOJOSHADER_print_debug_token
#endif
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#if !MOJOSHADER_FORCE_INCLUDE_CALLBACKS
// !!! FIXME: most of these _MSC_VER should probably be _WINDOWS?
#ifdef _MSC_VER
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h> // GL headers need this for WINGDIAPI definition.
#else
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#endif
int MOJOSHADER_internal_include_open(MOJOSHADER_includeType inctype,
const char *fname, const char *parent,
const char **outdata,
unsigned int *outbytes,
MOJOSHADER_malloc m, MOJOSHADER_free f,
void *d)
{
#ifdef _MSC_VER
#error Write me.
#else
struct stat statbuf;
if (stat(fname, &statbuf) == -1)
return 0;
char *data = (char *) m(statbuf.st_size, d);
if (data == NULL)
return 0;
const int fd = open(fname, O_RDONLY);
if (fd == -1)
{
f(data, d);
return 0;
} // if
if (read(fd, data, statbuf.st_size) != statbuf.st_size)
{
f(data, d);
close(fd);
return 0;
} // if
close(fd);
*outdata = data;
*outbytes = (unsigned int) statbuf.st_size;
return 1;
#endif
} // MOJOSHADER_internal_include_open
void MOJOSHADER_internal_include_close(const char *data, MOJOSHADER_malloc m,
MOJOSHADER_free f, void *d)
{
f((void *) data, d);
} // MOJOSHADER_internal_include_close
#endif // !MOJOSHADER_FORCE_INCLUDE_CALLBACKS
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// data buffer stuff...
#define BUFFER_LEN (64 * 1024)
typedef struct BufferList
{
char buffer[BUFFER_LEN];
size_t bytes;
struct BufferList *next;
} BufferList;
typedef struct Buffer
{
size_t total_bytes;
BufferList head;
BufferList *tail;
} Buffer;
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static void init_buffer(Buffer *buffer)
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{
buffer->total_bytes = 0;
buffer->head.bytes = 0;
buffer->head.next = NULL;
buffer->tail = &buffer->head;
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} // init_buffer
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static int add_to_buffer(Buffer *buffer, const char *data,
size_t len, MOJOSHADER_malloc m, void *d)
{
buffer->total_bytes += len;
while (len > 0)
{
const size_t avail = BUFFER_LEN - buffer->tail->bytes;
const size_t cpy = (avail > len) ? len : avail;
memcpy(buffer->tail->buffer + buffer->tail->bytes, data, cpy);
len -= cpy;
data += cpy;
buffer->tail->bytes += cpy;
assert(buffer->tail->bytes <= BUFFER_LEN);
if (buffer->tail->bytes == BUFFER_LEN)
{
BufferList *item = (BufferList *) m(sizeof (BufferList), d);
if (item == NULL)
return 0;
item->bytes = 0;
item->next = NULL;
buffer->tail->next = item;
buffer->tail = item;
} // if
} // while
return 1;
} // add_to_buffer
static char *flatten_buffer(Buffer *buffer, MOJOSHADER_malloc m, void *d)
{
char *retval = m(buffer->total_bytes + 1, d);
if (retval == NULL)
return NULL;
BufferList *item = &buffer->head;
char *ptr = retval;
while (item != NULL)
{
BufferList *next = item->next;
memcpy(ptr, item->buffer, item->bytes);
ptr += item->bytes;
item = next;
} // while
*ptr = '\0';
assert(ptr == (retval + buffer->total_bytes));
return retval;
} // flatten_buffer
static void free_buffer(Buffer *buffer, MOJOSHADER_free f, void *d)
{
// head is statically allocated, so start with head.next...
BufferList *item = buffer->head.next;
while (item != NULL)
{
BufferList *next = item->next;
f(item, d);
item = next;
} // while
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init_buffer(buffer);
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} // free_buffer
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// !!! FIXME: maybe use these pool magic elsewhere?
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// Pool stuff...
// ugh, I hate this macro salsa.
#define FREE_POOL(type, poolname) \
static void free_##poolname##_pool(Context *ctx) { \
type *item = ctx->poolname##_pool; \
while (item != NULL) { \
type *next = item->next; \
Free(ctx, item); \
item = next; \
} \
}
#define GET_POOL(type, poolname) \
static type *get_##poolname(Context *ctx) { \
type *retval = ctx->poolname##_pool; \
if (retval != NULL) \
ctx->poolname##_pool = retval->next; \
else \
retval = (type *) Malloc(ctx, sizeof (type)); \
if (retval != NULL) \
memset(retval, '\0', sizeof (type)); \
return retval; \
}
#define PUT_POOL(type, poolname) \
static void put_##poolname(Context *ctx, type *item) { \
item->next = ctx->poolname##_pool; \
}
#define IMPLEMENT_POOL(type, poolname) \
FREE_POOL(type, poolname) \
GET_POOL(type, poolname) \
PUT_POOL(type, poolname)
IMPLEMENT_POOL(Conditional, conditional)
IMPLEMENT_POOL(IncludeState, include)
IMPLEMENT_POOL(DefineHash, define)
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// Preprocessor define hashtable stuff...
static unsigned char hash_define(const char *sym)
{
unsigned char retval = 0;
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while (*sym)
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retval += *(sym++);
return retval;
} // hash_define
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static int add_define(Context *ctx, const char *sym, const char *val, int copy)
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{
char *identifier = NULL;
char *definition = NULL;
const unsigned char hash = hash_define(sym);
DefineHash *bucket = ctx->define_hashtable[hash];
while (bucket)
{
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if (strcmp(bucket->identifier, sym) == 0)
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{
failf(ctx, "'%s' already defined", sym);
return 0;
} // if
bucket = bucket->next;
} // while
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bucket = get_define(ctx);
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if (bucket == NULL)
return 0;
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identifier = StrDup(ctx, sym);
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if (identifier == NULL)
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{
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put_define(ctx, bucket);
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return 0;
} // if
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if (!copy)
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bucket->definition = val;
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else
{
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definition = StrDup(ctx, val);
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if (definition == NULL)
{
Free(ctx, identifier);
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put_define(ctx, bucket);
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return 0;
} // if
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bucket->definition = definition;
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} // if
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bucket->identifier = identifier;
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bucket->next = ctx->define_hashtable[hash];
ctx->define_hashtable[hash] = bucket;
return 1;
} // add_define
static int remove_define(Context *ctx, const char *sym)
{
const unsigned char hash = hash_define(sym);
DefineHash *bucket = ctx->define_hashtable[hash];
DefineHash *prev = NULL;
while (bucket)
{
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if (strcmp(bucket->identifier, sym) == 0)
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{
if (prev == NULL)
ctx->define_hashtable[hash] = bucket->next;
else
prev->next = bucket->next;
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Free(ctx, (void *) bucket->identifier);
Free(ctx, (void *) bucket->definition);
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put_define(ctx, bucket);
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return 1;
} // if
prev = bucket;
bucket = bucket->next;
} // while
return 0;
} // remove_define
static const char *find_define(Context *ctx, const char *sym)
{
const unsigned char hash = hash_define(sym);
DefineHash *bucket = ctx->define_hashtable[hash];
while (bucket)
{
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if (strcmp(bucket->identifier, sym) == 0)
return bucket->definition;
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bucket = bucket->next;
} // while
return NULL;
} // find_define
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static void put_all_defines(Context *ctx)
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{
int i;
for (i = 0; i < STATICARRAYLEN(ctx->define_hashtable); i++)
{
DefineHash *bucket = ctx->define_hashtable[i];
ctx->define_hashtable[i] = NULL;
while (bucket)
{
DefineHash *next = bucket->next;
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Free(ctx, (void *) bucket->identifier);
Free(ctx, (void *) bucket->definition);
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put_define(ctx, bucket);
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bucket = next;
} // while
} // for
} // find_define
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// filename cache stuff...
static const char *cache_filename(Context *ctx, const char *fname)
{
if (fname == NULL)
return NULL;
// !!! FIXME: this could be optimized into a hash table, but oh well.
FilenameCache *item = ctx->filename_cache;
while (item != NULL)
{
if (strcmp(item->filename, fname) == 0)
return item->filename;
item = item->next;
} // while
// new cache item.
item = (FilenameCache *) Malloc(ctx, sizeof (FilenameCache));
if (item == NULL)
return NULL;
item->filename = StrDup(ctx, fname);
if (item->filename == NULL)
{
Free(ctx, item);
return NULL;
} // if
item->next = ctx->filename_cache;
ctx->filename_cache = item;
return item->filename;
} // cache_filename
static void free_filename_cache(Context *ctx)
{
FilenameCache *item = ctx->filename_cache;
while (item != NULL)
{
FilenameCache *next = item->next;
Free(ctx, item->filename);
Free(ctx, item);
item = next;
} // while
} // free_filename_cache
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static int push_source(Context *ctx, const char *fname, const char *source,
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unsigned int srclen, unsigned int linenum,
MOJOSHADER_includeClose close_callback)
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{
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IncludeState *state = get_include(ctx);
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if (state == NULL)
return 0;
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if (fname != NULL)
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{
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state->filename = cache_filename(ctx, fname);
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if (state->filename == NULL)
{
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put_include(ctx, state);
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return 0;
} // if
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} // if
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state->close_callback = close_callback;
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state->source_base = source;
state->source = source;
state->token = source;
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state->orig_length = srclen;
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state->bytes_left = srclen;
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state->line = linenum;
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state->next = ctx->include_stack;
ctx->include_stack = state;
return 1;
} // push_source
static void pop_source(Context *ctx)
{
IncludeState *state = ctx->include_stack;
if (state == NULL)
return;
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if (state->close_callback)
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{
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state->close_callback(state->source_base, ctx->malloc,
ctx->free, ctx->malloc_data);
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} // if
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// state->filename is a pointer to the filename cache; don't free it here!
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while (state->conditional_stack)
put_conditional(ctx, state->conditional_stack);
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ctx->include_stack = state->next;
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put_include(ctx, state);
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} // pop_source
Preprocessor *preprocessor_start(const char *fname, const char *source,
unsigned int sourcelen,
MOJOSHADER_includeOpen open_callback,
MOJOSHADER_includeClose close_callback,
const MOJOSHADER_preprocessorDefine **defines,
unsigned int define_count,
MOJOSHADER_malloc m, MOJOSHADER_free f, void *d)
{
int okay = 1;
int i = 0;
// the preprocessor is internal-only, so we verify all these are != NULL.
assert(m != NULL);
assert(f != NULL);
assert(open_callback != NULL);
assert(close_callback != NULL);
Context *ctx = (Context *) m(sizeof (Context), d);
if (ctx == NULL)
return 0;
memset(ctx, '\0', sizeof (Context));
ctx->malloc = m;
ctx->free = f;
ctx->malloc_data = d;
ctx->open_callback = open_callback;
ctx->close_callback = close_callback;
for (i = 0; i < define_count; i++)
{
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if (!add_define(ctx, defines[i]->identifier, defines[i]->definition, 1))
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{
okay = 0;
break;
} // if
} // for
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if ((okay) && (!push_source(ctx, fname, source, sourcelen, 1, NULL)))
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okay = 0;
if (!okay)
{
preprocessor_end((Preprocessor *) ctx);
return NULL;
} // if
return (Preprocessor *) ctx;
} // preprocessor_start
void preprocessor_end(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
if (ctx == NULL)
return;
while (ctx->include_stack != NULL)
pop_source(ctx);
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put_all_defines(ctx);
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free_filename_cache(ctx);
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free_define_pool(ctx);
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free_conditional_pool(ctx);
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free_include_pool(ctx);
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Free(ctx, ctx);
} // preprocessor_end
int preprocessor_outofmemory(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
return ctx->out_of_memory;
} // preprocessor_outofmemory
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static inline void pushback(IncludeState *state)
{
#if DEBUG_PREPROCESSOR
printf("PREPROCESSOR PUSHBACK\n");
#endif
assert(!state->pushedback);
state->pushedback = 1;
} // pushback
static Token lexer(IncludeState *state)
{
if (!state->pushedback)
return preprocessor_lexer(state);
state->pushedback = 0;
return state->tokenval;
} // lexer
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// !!! FIXME: parsing fails on preprocessor directives should skip rest of line.
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static int require_newline(IncludeState *state)
{
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const Token token = lexer(state);
pushback(state); // rewind no matter what.
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return ( (token == TOKEN_INCOMPLETE_COMMENT) || // call it an eol.
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(token == ((Token) '\n')) || (token == TOKEN_EOI) );
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} // require_newline
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static void handle_pp_include(Context *ctx)
{
IncludeState *state = ctx->include_stack;
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Token token = lexer(state);
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MOJOSHADER_includeType incltype;
char *filename = NULL;
int bogus = 0;
if (token == TOKEN_STRING_LITERAL)
incltype = MOJOSHADER_INCLUDETYPE_LOCAL;
else if (token == ((Token) '<'))
{
incltype = MOJOSHADER_INCLUDETYPE_SYSTEM;
// can't use lexer, since every byte between the < > pair is
// considered part of the filename. :/
while (!bogus)
{
if ( !(bogus = (state->bytes_left == 0)) )
{
const char ch = *state->source;
if ( !(bogus = ((ch == '\r') || (ch == '\n'))) )
{
state->source++;
state->bytes_left--;
if (ch == '>')
break;
} // if
} // if
} // while
} // else if
else
{
bogus = 1;
} // else
if (!bogus)
{
state->token++; // skip '<' or '\"'...
const unsigned int len = ((unsigned int) (state->source-state->token));
filename = (char *) alloca(len);
memcpy(filename, state->token, len-1);
filename[len-1] = '\0';
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bogus = !require_newline(state);
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} // if
if (bogus)
{
fail(ctx, "Invalid #include directive");
return;
} // else
const char *newdata = NULL;
unsigned int newbytes = 0;
if (!ctx->open_callback(incltype, filename, state->source_base,
&newdata, &newbytes, ctx->malloc,
ctx->free, ctx->malloc_data))
{
fail(ctx, "Include callback failed"); // !!! FIXME: better error
return;
} // if
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if (!push_source(ctx, filename, newdata, newbytes, 1, ctx->close_callback))
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{
assert(ctx->out_of_memory);
ctx->close_callback(newdata, ctx->malloc, ctx->free, ctx->malloc_data);
} // if
} // handle_pp_include
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static void handle_pp_line(Context *ctx)
{
IncludeState *state = ctx->include_stack;
char *filename = NULL;
int linenum = 0;
int bogus = 0;
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if (lexer(state) != TOKEN_INT_LITERAL)
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bogus = 1;
else
{
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char *buf = (char *) alloca(state->tokenlen+1);
memcpy(buf, state->token, state->tokenlen);
buf[state->tokenlen] = '\0';
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linenum = atoi(buf);
} // else
if (!bogus)
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bogus = (lexer(state) != TOKEN_STRING_LITERAL);
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if (!bogus)
{
state->token++; // skip '\"'...
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filename = (char *) alloca(state->tokenlen);
memcpy(filename, state->token, state->tokenlen-1);
filename[state->tokenlen-1] = '\0';
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bogus = !require_newline(state);
} // if
if (bogus)
{
fail(ctx, "Invalid #line directive");
return;
} // if
const char *cached = cache_filename(ctx, filename);
assert((cached != NULL) || (ctx->out_of_memory));
state->filename = cached;
state->line = linenum;
} // handle_pp_line
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static void handle_pp_error(Context *ctx)
{
IncludeState *state = ctx->include_stack;
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char *ptr = ctx->failstr;
int avail = sizeof (ctx->failstr) - 1;
int cpy = 0;
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int done = 0;
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const char *prefix = "#error";
const size_t prefixlen = strlen(prefix);
strcpy(ctx->failstr, prefix);
avail -= prefixlen;
ptr += prefixlen;
state->report_whitespace = 1;
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while (!done)
{
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const Token token = lexer(state);
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switch (token)
{
case ((Token) '\n'):
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state->line--; // make sure error is on the right line.
// fall through!
case TOKEN_INCOMPLETE_COMMENT:
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case TOKEN_EOI:
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pushback(state); // move back so we catch this later.
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done = 1;
break;
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case ' ':
if (!avail)
break;
*(ptr++) = ' ';
avail--;
break;
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default:
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cpy = Min(avail, (int) state->tokenlen);
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if (cpy)
memcpy(ptr, state->token, cpy);
ptr += cpy;
avail -= cpy;
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break;
} // switch
} // while
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*ptr = '\0';
state->report_whitespace = 0;
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ctx->isfail = 1;
} // handle_pp_error
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static void handle_pp_define(Context *ctx)
{
IncludeState *state = ctx->include_stack;
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if (lexer(state) != TOKEN_IDENTIFIER)
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{
fail(ctx, "Macro names must be indentifiers");
return;
} // if
MOJOSHADER_malloc m = ctx->malloc;
void *d = ctx->malloc_data;
const char space = ' ';
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char *sym = (char *) alloca(state->tokenlen+1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
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Buffer buffer;
init_buffer(&buffer);
int done = 0;
state->report_whitespace = 1;
while ((!done) && (!ctx->out_of_memory))
{
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const Token token = lexer(state);
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switch (token)
{
case TOKEN_INCOMPLETE_COMMENT:
case TOKEN_EOI:
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pushback(state); // move back so we catch this later.
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// fall through!
case ((Token) '\n'):
done = 1;
break;
case ((Token) ' '): // may not actually point to ' '.
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if (buffer.total_bytes > 0)
{
if (!add_to_buffer(&buffer, &space, 1, m, d))
ctx->out_of_memory = 1;
} // if
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break;
default:
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if (!add_to_buffer(&buffer,state->token,state->tokenlen,m,d))
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ctx->out_of_memory = 1;
break;
} // switch
} // while
state->report_whitespace = 0;
char *definition = NULL;
if (!ctx->out_of_memory)
{
definition = flatten_buffer(&buffer, m, d);
ctx->out_of_memory = (definition == NULL);
} // if
free_buffer(&buffer, ctx->free, d);
if (ctx->out_of_memory)
return;
assert(done);
add_define(ctx, sym, definition, 0);
} // handle_pp_define
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static void handle_pp_undef(Context *ctx)
{
IncludeState *state = ctx->include_stack;
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if (lexer(state) != TOKEN_IDENTIFIER)
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{
fail(ctx, "Macro names must be indentifiers");
return;
} // if
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char *sym = (char *) alloca(state->tokenlen+1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
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if (!require_newline(state))
{
fail(ctx, "Invalid #undef directive");
return;
} // if
remove_define(ctx, sym);
} // handle_pp_undef
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static Conditional *_handle_pp_ifdef(Context *ctx, const Token type)
{
IncludeState *state = ctx->include_stack;
assert((type == TOKEN_PP_IFDEF) || (type == TOKEN_PP_IFNDEF));
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if (lexer(state) != TOKEN_IDENTIFIER)
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{
fail(ctx, "Macro names must be indentifiers");
return NULL;
} // if
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char *sym = (char *) alloca(state->tokenlen+1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
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if (!require_newline(state))
{
if (type == TOKEN_PP_IFDEF)
fail(ctx, "Invalid #ifdef directive");
else
fail(ctx, "Invalid #ifndef directive");
return NULL;
} // if
Conditional *conditional = get_conditional(ctx);
assert((conditional != NULL) || (ctx->out_of_memory));
if (conditional == NULL)
return NULL;
Conditional *prev = state->conditional_stack;
int skipping = ((prev != NULL) && (prev->skipping));
if (!skipping)
{
const int found = (find_define(ctx, sym) != NULL);
if (type == TOKEN_PP_IFDEF)
skipping = !found;
else
skipping = found;
} // if