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mojoshader_preprocessor.c
2362 lines (1984 loc) · 66.5 KB
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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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int parsing_pragma;
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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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Define *file_macro;
Define *line_macro;
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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)
{
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ctx->free(ptr, ctx->malloc_data);
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} // Free
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static void *MallocBridge(int bytes, void *data)
{
return Malloc((Context *) data, (size_t) bytes);
} // MallocBridge
static void FreeBridge(void *ptr, void *data)
{
Free((Context *) data, ptr);
} // FreeBridge
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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);
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TOKENCASE(TOKEN_HASH);
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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_PP_PRAGMA);
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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 wpath[MAX_PATH];
if (!MultiByteToWideChar(CP_UTF8, 0, fname, -1, wpath, MAX_PATH))
return 0;
const DWORD share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
const HANDLE handle = CreateFileW(wpath, FILE_GENERIC_READ, share,
NULL, OPEN_EXISTING, NULL, NULL);
if (handle == INVALID_HANDLE_VALUE)
return 0;
const DWORD fileSize = GetFileSize(handle, NULL);
if (fileSize == INVALID_FILE_SIZE)
{
CloseHandle(handle);
return 0;
} // if
char *data = (char *) m(fileSize, d);
if (data == NULL)
{
CloseHandle(handle);
return 0;
} // if
DWORD readLength = 0;
if (!ReadFile(handle, data, fileSize, &readLength, NULL))
{
CloseHandle(handle);
f(data, d);
return 0;
} // if
CloseHandle(handle);
if (readLength != fileSize)
{
f(data, d);
return 0;
} // if
*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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// !!! FIXME: maybe use these pool magic elsewhere?
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// !!! FIXME: maybe just get rid of this? (maybe the fragmentation isn't a big deal?)
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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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{
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failf(ctx, "'%s' already defined", sym); // !!! FIXME: warning?
// !!! FIXME: gcc reports the location of previous #define here.
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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;
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bucket->original = NULL;
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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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if (def != NULL)
{
int i;
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);
Free(ctx, (void *) def->original);
put_define(ctx, def);
} // if
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} // 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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if ( (ctx->file_macro) && (strcmp(sym, "__FILE__") == 0) )
{
Free(ctx, (char *) ctx->file_macro->definition);
const IncludeState *state = ctx->include_stack;
const char *fname = state ? state->filename : "";
const size_t len = strlen(fname) + 2;
char *str = (char *) Malloc(ctx, len);
if (!str)
return NULL;
str[0] = '\"';
memcpy(str + 1, fname, len - 2);
str[len - 1] = '\"';
ctx->file_macro->definition = str;
return ctx->file_macro;
} // if
else if ( (ctx->line_macro) && (strcmp(sym, "__LINE__") == 0) )
{
Free(ctx, (char *) ctx->line_macro->definition);
const IncludeState *state = ctx->include_stack;
const size_t bufsize = 32;
char *str = (char *) Malloc(ctx, bufsize);
if (!str)
return 0;
const size_t len = snprintf(str, bufsize, "%u", state->line);
assert(len < bufsize);
ctx->line_macro->definition = str;
return ctx->line_macro;
} // else
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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 const Define *find_macro_arg(const IncludeState *state,
const Define *defines)
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{
const Define *def = NULL;
char *sym = (char *) alloca(state->tokenlen + 1);
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
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for (def = defines; def != NULL; def = def->next)
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{
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assert(def->parameters == NULL); // args can't have args!
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assert(def->paramcount == 0); // args can't have args!
if (strcmp(def->identifier, sym) == 0)
break;
} // while
return def;
} // find_macro_arg
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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)
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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 = stringcache(ctx->filename_cache, 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->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->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;
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assert(state != NULL); // more pops than pushes!
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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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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(MallocBridge, FreeBridge, ctx);
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okay = ((okay) && (ctx->filename_cache != NULL));
ctx->file_macro = get_define(ctx);
okay = ((okay) && (ctx->file_macro != NULL));
if ((okay) && (ctx->file_macro))
okay = ((ctx->file_macro->identifier = StrDup(ctx, "__FILE__")) != 0);
ctx->line_macro = get_define(ctx);
okay = ((okay) && (ctx->line_macro != NULL));
if ((okay) && (ctx->line_macro))
okay = ((ctx->line_macro->identifier = StrDup(ctx, "__LINE__")) != 0);
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// let the usual preprocessor parser sort these out.
char *define_include = NULL;
unsigned int define_include_len = 0;
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if ((okay) && (define_count > 0))
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{
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Buffer *predefbuf = buffer_create(256, MallocBridge, FreeBridge, ctx);
okay = okay && (predefbuf != NULL);
for (i = 0; okay && (i < define_count); i++)
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{
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okay = okay && buffer_append_fmt(predefbuf, "#define %s %s\n",
defines[i].identifier, defines[i].definition);
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} // for
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define_include_len = buffer_size(predefbuf);
if (define_include_len > 0)
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{
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define_include = buffer_flatten(predefbuf);
okay = okay && (define_include != NULL);
} // if
buffer_destroy(predefbuf);
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} // if
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if ((okay) && (!push_source(ctx,fname,source,sourcelen,1,NULL)))
661
662
okay = 0;
663
if ((okay) && (define_include_len > 0))
664
{
665
assert(define_include != NULL);
666
okay = push_source(ctx, "<predefined macros>", define_include,
667
define_include_len, 1, close_define_include);
668
669
} // if
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
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);
689
690
put_all_defines(ctx);
691
692
693
if (ctx->filename_cache != NULL)
stringcache_destroy(ctx->filename_cache);
694
695
free_define(ctx, ctx->file_macro);
free_define(ctx, ctx->line_macro);
696
free_define_pool(ctx);
697
free_conditional_pool(ctx);
698
free_include_pool(ctx);
699
700
701
702
703
704
705
706
707
708
709
710
Free(ctx, ctx);
} // preprocessor_end
int preprocessor_outofmemory(Preprocessor *_ctx)
{
Context *ctx = (Context *) _ctx;
return ctx->out_of_memory;
} // preprocessor_outofmemory
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
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
730
// !!! FIXME: parsing fails on preprocessor directives should skip rest of line.
731
732
static int require_newline(IncludeState *state)
{
733
734
const Token token = lexer(state);
pushback(state); // rewind no matter what.
735
return ( (token == TOKEN_INCOMPLETE_COMMENT) || // call it an eol.
736
(token == ((Token) '\n')) || (token == TOKEN_EOI) );
737
738
} // require_newline
739
// !!! FIXME: didn't we implement this by hand elsewhere?
740
741
742
743
744
745
746
747
748
749
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
750
751
752
static void handle_pp_include(Context *ctx)
{
IncludeState *state = ctx->include_stack;
753
Token token = lexer(state);
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
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';
793
bogus = !require_newline(state);
794
795
796
797
798
799
800
801
802
803
} // if
if (bogus)
{
fail(ctx, "Invalid #include directive");
return;
} // else
const char *newdata = NULL;
unsigned int newbytes = 0;
804
805
806
807
808
809
if ((ctx->open_callback == NULL) || (ctx->close_callback == NULL))
{
fail(ctx, "Saw #include, but no include callbacks defined");
return;
} // if
810
811
812
813
814
815
816
817
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
818
MOJOSHADER_includeClose callback = ctx->close_callback;
819
if (!push_source(ctx, filename, newdata, newbytes, 1, callback))
820
821
822
823
824
825
826
{
assert(ctx->out_of_memory);
ctx->close_callback(newdata, ctx->malloc, ctx->free, ctx->malloc_data);
} // if
} // handle_pp_include
827
828
829
830
831
832
833
static void handle_pp_line(Context *ctx)
{
IncludeState *state = ctx->include_stack;
char *filename = NULL;
int linenum = 0;
int bogus = 0;
834
if (lexer(state) != TOKEN_INT_LITERAL)
835
836
bogus = 1;
else
837
linenum = token_to_int(state);
838
839
if (!bogus)
840
841
842
843
844
845
846
847
848
{
Token t = lexer(state);
if (t == ((Token) '\n'))
{
state->line = linenum;
return;
}
bogus = (t != TOKEN_STRING_LITERAL);
}
849
850
851
852
if (!bogus)
{
state->token++; // skip '\"'...
853
854
855
filename = (char *) alloca(state->tokenlen);
memcpy(filename, state->token, state->tokenlen-1);
filename[state->tokenlen-1] = '\0';
856
857
858
859
860
861
862
863
864
bogus = !require_newline(state);
} // if
if (bogus)
{
fail(ctx, "Invalid #line directive");
return;
} // if
865
const char *cached = stringcache(ctx->filename_cache, filename);
866
state->filename = cached; // may be NULL if stringcache() failed.
867
868
869
870
state->line = linenum;
} // handle_pp_line
871
872
873
static void handle_pp_error(Context *ctx)
{
IncludeState *state = ctx->include_stack;
874
875
876
char *ptr = ctx->failstr;
int avail = sizeof (ctx->failstr) - 1;
int cpy = 0;
877
878
int done = 0;
879
880
881
882
883
884
885
const char *prefix = "#error";
const size_t prefixlen = strlen(prefix);
strcpy(ctx->failstr, prefix);
avail -= prefixlen;
ptr += prefixlen;
state->report_whitespace = 1;
886
887
while (!done)
{
888
const Token token = lexer(state);
889
890
891
switch (token)
{
case ((Token) '\n'):
892
893
894
state->line--; // make sure error is on the right line.
// fall through!
case TOKEN_INCOMPLETE_COMMENT:
895
case TOKEN_EOI:
896
pushback(state); // move back so we catch this later.
897
898
899
done = 1;
break;
900
case ((Token) ' '):
901
902
903
904
905
906
if (!avail)
break;
*(ptr++) = ' ';
avail--;
break;
907
default:
908
cpy = Min(avail, (int) state->tokenlen);
909
910
911
912
if (cpy)
memcpy(ptr, state->token, cpy);
ptr += cpy;
avail -= cpy;
913
914
915
916
break;
} // switch
} // while
917
918
*ptr = '\0';
state->report_whitespace = 0;
919
920
921
922
ctx->isfail = 1;
} // handle_pp_error
923
924
925
static void handle_pp_define(Context *ctx)
{
IncludeState *state = ctx->include_stack;
926
int done = 0;
927
928
if (lexer(state) != TOKEN_IDENTIFIER)
929
{
930
fail(ctx, "Macro names must be identifiers");
931
932
933
return;
} // if
934
935
936
937
char *definition = NULL;
char *sym = (char *) Malloc(ctx, state->tokenlen+1);
if (sym == NULL)
return;
938
939
memcpy(sym, state->token, state->tokenlen);
sym[state->tokenlen] = '\0';
940
941
942
943
944
945
946
947
if (strcmp(sym, "defined") == 0)
{
Free(ctx, sym);
fail(ctx, "'defined' cannot be used as a macro name");
return;
} // if
948
949
950
// Don't treat these symbols as special anymore if they get (re)#defined.
if (strcmp(sym, "__FILE__") == 0)
{
951
952
if (ctx->file_macro)
{
953
failf(ctx, "'%s' already defined", sym); // !!! FIXME: warning?
954
955
956
free_define(ctx, ctx->file_macro);
ctx->file_macro = NULL;
} // if
957
958
959
} // if
else if (strcmp(sym, "__LINE__") == 0)
{
960
961
if (ctx->line_macro)
{
962
failf(ctx, "'%s' already defined", sym); // !!! FIXME: warning?
963
964
965
free_define(ctx, ctx->line_macro);
ctx->line_macro = NULL;
} // if
966
967
} // else if
968
969
970
971
972
// #define a(b) is different than #define a (b) :(
state->report_whitespace = 1;
lexer(state);
state->report_whitespace = 0;
973
int params = 0;
974
char **idents = NULL;
975
static const char space = ' ';
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
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
998
999
1000
if (params == 0) // special case for void args: "#define a() b"
params = -1;
else