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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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#if DEBUG_TOKENIZER
static void print_debug_lexing_position(IncludeState *s)
{
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if (s != NULL)
printf("NOW LEXING %s:%d ...\n", s->filename, s->line);
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} // print_debug_lexing_position
#else
#define print_debug_lexing_position(s)
#endif
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typedef struct Context
{
int isfail;
int out_of_memory;
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char failstr[256];
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int recursion_count;
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int asm_comments;
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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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Define *define_hashtable[256];
Define *define_pool;
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StringCache *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
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WCHAR widePath[MAX_PATH];
if (!MultiByteToWideChar( CP_UTF8, 0, fname, -1, widePath, MAX_PATH ))
return 0;
HANDLE fileHandle = CreateFileW (widePath, FILE_GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, NULL, NULL );
if (fileHandle == INVALID_HANDLE_VALUE)
return 0;
DWORD fileSize = GetFileSize (fileHandle, NULL);
if (fileSize == INVALID_FILE_SIZE)
{
CloseHandle (fileHandle);
return 0;
}
char *data = (char *) m(fileSize, d);
if (data == NULL)
{
CloseHandle (fileHandle);
return 0;
}
DWORD readLength = 0;
if (!ReadFile( fileHandle, data, fileSize, &readLength, NULL))
{
CloseHandle (fileHandle);
f(data, d);
return 0;
}
CloseHandle (fileHandle);
if (readLength != fileSize)
{
f(data, d);
return 0;
}
*outdata = data;
*outbytes = fileSize;
return 1;
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#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)
{
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char *retval = (char *) m(buffer->total_bytes + 1, d);
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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; \
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ctx->poolname##_pool = item; \
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}
#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)
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IMPLEMENT_POOL(Define, define)
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// Preprocessor define hashtable stuff...
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// !!! FIXME: why isn't this using mojoshader_common.c's code?
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// this is djb's xor hashing function.
static inline uint32 hash_string_djbxor(const char *sym)
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{
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register uint32 hash = 5381;
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while (*sym)
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hash = ((hash << 5) + hash) ^ *(sym++);
return hash;
} // hash_string_djbxor
static inline uint8 hash_define(const char *sym)
{
return (uint8) hash_string_djbxor(sym);
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} // hash_define
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static int add_define(Context *ctx, const char *sym, const char *val,
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char **parameters, int paramcount)
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{
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const uint8 hash = hash_define(sym);
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Define *bucket = ctx->define_hashtable[hash];
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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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bucket->definition = val;
bucket->identifier = sym;
bucket->parameters = (const char **) parameters;
bucket->paramcount = paramcount;
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bucket->next = ctx->define_hashtable[hash];
ctx->define_hashtable[hash] = bucket;
return 1;
} // add_define
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static void free_define(Context *ctx, Define *def)
{
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int i;
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for (i = 0; i < def->paramcount; i++)
Free(ctx, (void *) def->parameters[i]);
Free(ctx, (void *) def->parameters);
Free(ctx, (void *) def->identifier);
Free(ctx, (void *) def->definition);
put_define(ctx, def);
} // free_define
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static int remove_define(Context *ctx, const char *sym)
{
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const uint8 hash = hash_define(sym);
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Define *bucket = ctx->define_hashtable[hash];
Define *prev = NULL;
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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_define(ctx, bucket);
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return 1;
} // if
prev = bucket;
bucket = bucket->next;
} // while
return 0;
} // remove_define
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static const Define *find_define(Context *ctx, const char *sym)
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{
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const uint8 hash = hash_define(sym);
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Define *bucket = ctx->define_hashtable[hash];
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while (bucket)
{
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if (strcmp(bucket->identifier, sym) == 0)
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return bucket;
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bucket = bucket->next;
} // while
return NULL;
} // find_define
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static const Define *find_define_by_token(Context *ctx)
{
IncludeState *state = ctx->include_stack;
assert(state->tokenval == TOKEN_IDENTIFIER);
char *sym = (char *) alloca(state->tokenlen+1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
return find_define(ctx, sym);
} // find_define_by_token
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static void put_all_defines(Context *ctx)
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{
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size_t i;
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for (i = 0; i < STATICARRAYLEN(ctx->define_hashtable); i++)
{
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Define *bucket = ctx->define_hashtable[i];
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ctx->define_hashtable[i] = NULL;
while (bucket)
{
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Define *next = bucket->next;
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free_define(ctx, bucket);
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bucket = next;
} // while
} // for
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} // put_all_defines
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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,
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MOJOSHADER_includeClose close_callback, Define *defs)
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{
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if (srclen == 0)
return 1; // nothing to do: just pretend you did it.
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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 = stringcache(ctx->filename_cache, fname);
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if (state->filename == NULL)
{
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out_of_memory(ctx);
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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->tokenval = ((Token) '\n');
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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->defines = defs;
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state->next = ctx->include_stack;
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state->asm_comments = ctx->asm_comments;
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print_debug_lexing_position(state);
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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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Conditional *cond = state->conditional_stack;
while (cond)
{
Conditional *next = cond->next;
put_conditional(ctx, cond);
cond = next;
} // while
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Define *def = state->defines;
while (def)
{
Define *next = def->next;
def->identifier = NULL; // we reuse an allocation here, don't free!
assert(def->parameters == NULL);
assert(def->paramcount == 0);
free_define(ctx, def);
def = next;
} // while
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ctx->include_stack = state->next;
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print_debug_lexing_position(ctx->include_stack);
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put_include(ctx, state);
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} // pop_source
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static void close_define_include(const char *data, MOJOSHADER_malloc m,
MOJOSHADER_free f, void *d)
{
f((void *) data, d);
} // close_define_include
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Preprocessor *preprocessor_start(const char *fname, const char *source,
unsigned int sourcelen,
MOJOSHADER_includeOpen open_callback,
MOJOSHADER_includeClose close_callback,
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const MOJOSHADER_preprocessorDefine *defines,
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unsigned int define_count, int asm_comments,
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MOJOSHADER_malloc m, MOJOSHADER_free f, void *d)
{
int okay = 1;
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unsigned int i = 0;
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// the preprocessor is internal-only, so we verify all these are != NULL.
assert(m != NULL);
assert(f != NULL);
Context *ctx = (Context *) m(sizeof (Context), d);
if (ctx == NULL)
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return NULL;
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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;
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ctx->asm_comments = asm_comments;
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ctx->filename_cache = stringcache_create(m, f, d);
if (ctx->filename_cache == 0)
{
f(ctx, d);
return NULL;
} // if
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// let the usual preprocessor parser sort these out.
char *define_include = NULL;
unsigned int define_include_len = 0;
if (define_count > 0)
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{
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for (i = 0; i < define_count; i++)
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{
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define_include_len += strlen(defines[i].identifier);
define_include_len += strlen(defines[i].definition);
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define_include_len += 10; // "#define<space><space><newline>"
} // for
define_include_len++; // for null terminator.
define_include = (char *) Malloc(ctx, define_include_len);
if (define_include == NULL)
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okay = 0;
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else
{
char *ptr = define_include;
for (i = 0; i < define_count; i++)
{
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679
ptr += sprintf(ptr, "#define %s %s\n", defines[i].identifier,
defines[i].definition);
680
681
682
} // for
} // else
} // if
683
684
if ((okay) && (!push_source(ctx, fname, source, sourcelen, 1, NULL, NULL)))
685
686
okay = 0;
687
688
689
if ((okay) && (define_include != NULL))
{
okay = push_source(ctx, "<predefined macros>", define_include,
690
define_include_len, 1, close_define_include, NULL);
691
692
} // if
693
694
695
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697
698
699
700
701
702
703
704
705
706
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708
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711
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);
712
713
put_all_defines(ctx);
714
715
716
if (ctx->filename_cache != NULL)
stringcache_destroy(ctx->filename_cache);
717
free_define_pool(ctx);
718
free_conditional_pool(ctx);
719
free_include_pool(ctx);
720
721
722
723
724
725
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727
728
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730
731
Free(ctx, ctx);
} // preprocessor_end
int preprocessor_outofmemory(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
return ctx->out_of_memory;
} // preprocessor_outofmemory
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
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
751
// !!! FIXME: parsing fails on preprocessor directives should skip rest of line.
752
753
static int require_newline(IncludeState *state)
{
754
755
const Token token = lexer(state);
pushback(state); // rewind no matter what.
756
return ( (token == TOKEN_INCOMPLETE_COMMENT) || // call it an eol.
757
(token == ((Token) '\n')) || (token == TOKEN_EOI) );
758
759
760
} // require_newline
761
762
763
764
765
766
767
768
769
770
static int token_to_int(IncludeState *state)
{
assert(state->tokenval == TOKEN_INT_LITERAL);
char *buf = (char *) alloca(state->tokenlen+1);
memcpy(buf, state->token, state->tokenlen);
buf[state->tokenlen] = '\0';
return atoi(buf);
} // token_to_int
771
772
773
static void handle_pp_include(Context *ctx)
{
IncludeState *state = ctx->include_stack;
774
Token token = lexer(state);
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
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';
814
bogus = !require_newline(state);
815
816
817
818
819
820
821
822
823
824
} // if
if (bogus)
{
fail(ctx, "Invalid #include directive");
return;
} // else
const char *newdata = NULL;
unsigned int newbytes = 0;
825
826
827
828
829
830
if ((ctx->open_callback == NULL) || (ctx->close_callback == NULL))
{
fail(ctx, "Saw #include, but no include callbacks defined");
return;
} // if
831
832
833
834
835
836
837
838
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
839
840
MOJOSHADER_includeClose callback = ctx->close_callback;
if (!push_source(ctx, filename, newdata, newbytes, 1, callback, NULL))
841
842
843
844
845
846
847
{
assert(ctx->out_of_memory);
ctx->close_callback(newdata, ctx->malloc, ctx->free, ctx->malloc_data);
} // if
} // handle_pp_include
848
849
850
851
852
853
854
static void handle_pp_line(Context *ctx)
{
IncludeState *state = ctx->include_stack;
char *filename = NULL;
int linenum = 0;
int bogus = 0;
855
if (lexer(state) != TOKEN_INT_LITERAL)
856
857
bogus = 1;
else
858
linenum = token_to_int(state);
859
860
if (!bogus)
861
bogus = (lexer(state) != TOKEN_STRING_LITERAL);
862
863
864
865
if (!bogus)
{
state->token++; // skip '\"'...
866
867
868
filename = (char *) alloca(state->tokenlen);
memcpy(filename, state->token, state->tokenlen-1);
filename[state->tokenlen-1] = '\0';
869
870
871
872
873
874
875
876
877
bogus = !require_newline(state);
} // if
if (bogus)
{
fail(ctx, "Invalid #line directive");
return;
} // if
878
879
880
const char *cached = stringcache(ctx->filename_cache, filename);
if (cached == NULL)
out_of_memory(ctx);
881
882
883
884
885
state->filename = cached;
state->line = linenum;
} // handle_pp_line
886
887
888
static void handle_pp_error(Context *ctx)
{
IncludeState *state = ctx->include_stack;
889
890
891
char *ptr = ctx->failstr;
int avail = sizeof (ctx->failstr) - 1;
int cpy = 0;
892
893
int done = 0;
894
895
896
897
898
899
900
const char *prefix = "#error";
const size_t prefixlen = strlen(prefix);
strcpy(ctx->failstr, prefix);
avail -= prefixlen;
ptr += prefixlen;
state->report_whitespace = 1;
901
902
while (!done)
{
903
const Token token = lexer(state);
904
905
906
switch (token)
{
case ((Token) '\n'):
907
908
909
state->line--; // make sure error is on the right line.
// fall through!
case TOKEN_INCOMPLETE_COMMENT:
910
case TOKEN_EOI:
911
pushback(state); // move back so we catch this later.
912
913
914
done = 1;
break;
915
916
917
918
919
920
921
case ' ':
if (!avail)
break;
*(ptr++) = ' ';
avail--;
break;
922
default:
923
cpy = Min(avail, (int) state->tokenlen);
924
925
926
927
if (cpy)
memcpy(ptr, state->token, cpy);
ptr += cpy;
avail -= cpy;
928
929
930
931
break;
} // switch
} // while
932
933
*ptr = '\0';
state->report_whitespace = 0;
934
935
936
937
ctx->isfail = 1;
} // handle_pp_error
938
939
940
static void handle_pp_define(Context *ctx)
{
IncludeState *state = ctx->include_stack;
941
int done = 0;
942
943
if (lexer(state) != TOKEN_IDENTIFIER)
944
{
945
fail(ctx, "Macro names must be identifiers");
946
947
948
return;
} // if
949
950
951
952
char *definition = NULL;
char *sym = (char *) Malloc(ctx, state->tokenlen+1);
if (sym == NULL)
return;
953
954
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
955
956
957
958
959
960
961
962
if (strcmp(sym, "defined") == 0)
{
Free(ctx, sym);
fail(ctx, "'defined' cannot be used as a macro name");
return;
} // if
963
964
965
966
967
// #define a(b) is different than #define a (b) :(
state->report_whitespace = 1;
lexer(state);
state->report_whitespace = 0;
968
int params = 0;
969
char **idents = NULL;
970
971
972
MOJOSHADER_malloc m = ctx->malloc;
void *d = ctx->malloc_data;
static const char space = ' ';
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
if (state->tokenval == ((Token) ' '))
lexer(state); // skip it.
else if (state->tokenval == ((Token) '('))
{
IncludeState saved;
memcpy(&saved, state, sizeof (IncludeState));
while (1)
{
if (lexer(state) != TOKEN_IDENTIFIER)
break;
params++;
if (lexer(state) != ((Token) ','))
break;
} // while
if (state->tokenval != ((Token) ')'))
{
fail(ctx, "syntax error in macro parameter list");
goto handle_pp_define_failed;
} // if
995
996
997
if (params == 0) // special case for void args: "#define a() b"
params = -1;
else
998
999
1000
{
idents = (char **) Malloc(ctx, sizeof (char *) * params);
if (idents == NULL)