jcf.h   [plain text]

/* Utility macros to read Java(TM) .class files and byte codes.
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  

Java and all Java-based marks are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries.
The Free Software Foundation is independent of Sun Microsystems, Inc.  */

/* Written by Per Bothner <bothner@cygnus.com>, February 1996. */

#ifndef GCC_JCF_H
#define GCC_JCF_H
#include "javaop.h"

#ifndef JCF_u4
#define JCF_u4 unsigned long
#endif
#ifndef JCF_u2
#define JCF_u2 unsigned short
#endif

#define ALLOC xmalloc
#define REALLOC xrealloc
#ifndef FREE
#define FREE(PTR) free(PTR)
#endif

#ifdef JCF_word
#define JCF_word JCF_u4
#endif

/* If we have both "scandir" and "alphasort", we can cache directory
   listings to reduce the time taken to search the classpath.  */
#if defined(HAVE_SCANDIR) && defined(HAVE_ALPHASORT)
#define JCF_USE_SCANDIR 1
#else
#define JCF_USE_SCANDIR 0
#endif 

/* On case-insensitive file systems, we need to ensure that a request
   to open a .java or .class file is honored only if the file to be
   opened is of the exact case we are asking for. In other words, we
   want to override the inherent case insensitivity of the underlying
   file system. On other platforms, this macro becomes the vanilla
   open() call.

   If you want to add another host, add your define to the list below
   (i.e. defined(WIN32) || defined(YOUR_HOST)) and add an host-specific
   .c file to Make-lang.in similar to win32-host.c  */
#if defined(WIN32)
extern int
jcf_open_exact_case (const char* filename, int oflag);
#define JCF_OPEN_EXACT_CASE(X, Y) jcf_open_exact_case (X, Y)
#else
#define JCF_OPEN_EXACT_CASE open
#endif /* WIN32 */

struct JCF;
typedef int (*jcf_filbuf_t) (struct JCF*, int needed);

union cpool_entry GTY(()) {
  jword GTY ((tag ("0"))) w;
  tree GTY ((tag ("1"))) t;
};

#define cpool_entry_is_tree(tag) \
  (tag & CONSTANT_ResolvedFlag) || tag == CONSTANT_Utf8

typedef struct CPool GTY(()) {
  /* Available number of elements in the constants array, before it
     must be re-allocated. */
  int capacity;

  /* The constant_pool_count. */
  int		count;

  uint8* GTY((length ("%h.count")))	tags;

  union cpool_entry * GTY((length ("%h.count"),
			   desc ("cpool_entry_is_tree (%1.tags%a)")))	data;
} CPool;

struct ZipDirectory;

/* JCF encapsulates the state of reading a Java Class File. */

typedef struct JCF GTY(()) {
  unsigned char * GTY ((skip)) buffer;
  unsigned char * GTY ((skip)) buffer_end;
  unsigned char * GTY ((skip)) read_ptr;
  unsigned char * GTY ((skip)) read_end;
  unsigned int java_source : 1;
  unsigned int right_zip : 1;
  unsigned int finished : 1;
  jcf_filbuf_t filbuf;
  PTR GTY ((skip)) read_state;
  const char *filename;
  const char *classname;
  /* Directory entry where it was found.  */
  struct ZipDirectory * GTY ((skip)) zipd;
  JCF_u2 access_flags;
  JCF_u2 this_class;
  JCF_u2 super_class;
  CPool cpool;
} JCF;
/*typedef JCF*  JCF_FILE;*/

#define JCF_SEEN_IN_ZIP(JCF) ((JCF)->zipd != NULL)

/* The CPOOL macros take a (pointer to a) CPool.
   The JPOOL macros take a (pointer to a) JCF.
   Some of the latter should perhaps be deprecated or removed. */

#define CPOOL_COUNT(CPOOL) ((CPOOL)->count)
#define JPOOL_SIZE(JCF) CPOOL_COUNT(&(JCF)->cpool)
#define JPOOL_TAG(JCF, INDEX) ((JCF)->cpool.tags[INDEX])
/* The INDEX'th constant pool entry as a JCF_u4. */
#define CPOOL_UINT(CPOOL, INDEX) ((CPOOL)->data[INDEX].w)
#define JPOOL_UINT(JCF, INDEX) CPOOL_UINT(&(JCF)->cpool, INDEX) /*deprecated*/
/* The first uint16 of the INDEX'th constant pool entry. */
#define CPOOL_USHORT1(CPOOL, INDEX) ((CPOOL)->data[INDEX].w & 0xFFFF)
#define JPOOL_USHORT1(JCF, INDEX) CPOOL_USHORT1(&(JCF)->cpool, INDEX)
/* The second uint16 of the INDEX'th constant pool entry. */
#define CPOOL_USHORT2(CPOOL, INDEX) ((CPOOL)->data[INDEX].w >> 16)
#define JPOOL_USHORT2(JCF, INDEX) CPOOL_USHORT2(&(JCF)->cpool, INDEX)
#define JPOOL_LONG(JCF, INDEX) \
  WORDS_TO_LONG (JPOOL_UINT(JCF, INDEX), JPOOL_UINT(JCF, (INDEX)+1))
#define JPOOL_DOUBLE(JCF, INDEX) \
  WORDS_TO_DOUBLE  (JPOOL_UINT(JCF, INDEX), JPOOL_UINT(JCF, (INDEX)+1))
#ifndef JPOOL_UTF_LENGTH
#define JPOOL_UTF_LENGTH(JCF, INDEX) \
  GET_u2 ((JCF)->buffer+JPOOL_UINT(JCF, INDEX))
#endif
#ifndef JPOOL_UTF_DATA
#define JPOOL_UTF_DATA(JCF, INDEX) \
  ((JCF)->buffer+JPOOL_UINT(JCF, INDEX)+2)
#endif
#define JPOOL_INT(JCF, INDEX) (WORD_TO_INT(JPOOL_UINT (JCF, INDEX)))
#define JPOOL_FLOAT(JCF, INDEX) WORD_TO_FLOAT (JPOOL_UINT (JCF, INDEX))

#define CPOOL_INDEX_IN_RANGE(CPOOL, INDEX) \
 ((INDEX) > 0 && (INDEX) < CPOOL_COUNT(CPOOL))

#define CPOOL_FINISH(CPOOL) {			\
    (CPOOL)->tags = 0;				\
    (CPOOL)->data = 0;				\
  }

#define JCF_FINISH(JCF) { \
  CPOOL_FINISH(&(JCF)->cpool); \
  if ((JCF)->buffer) FREE ((JCF)->buffer); \
  if ((JCF)->filename) FREE ((char *) (JCF)->filename); \
  if ((JCF)->classname) FREE ((char *) (JCF)->classname); \
  (JCF)->finished = 1; }
  
#define CPOOL_INIT(CPOOL) \
  ((CPOOL)->capacity = 0, (CPOOL)->count = 0, (CPOOL)->tags = 0, (CPOOL)->data = 0)

#define CPOOL_REINIT(CPOOL) ((CPOOL)->count = 0)

#define JCF_ZERO(JCF)  \
  ((JCF)->buffer = (JCF)->buffer_end = (JCF)->read_ptr = (JCF)->read_end = 0,\
   (JCF)->read_state = 0, (JCF)->filename = (JCF)->classname = 0, \
   CPOOL_INIT(&(JCF)->cpool), (JCF)->java_source = 0, (JCF)->zipd = 0, \
   (JCF)->finished = 0)

/* Given that PTR points to a 2-byte unsigned integer in network
   (big-endian) byte-order, return that integer. */
#define GET_u2(PTR) (((PTR)[0] << 8) | ((PTR)[1]))
/* Like GET_u2, but for little-endian format. */
#define GET_u2_le(PTR) (((PTR)[1] << 8) | ((PTR)[0]))

/* Given that PTR points to a 4-byte unsigned integer in network
   (big-endian) byte-order, return that integer. */
#define GET_u4(PTR) (((JCF_u4)(PTR)[0] << 24) | ((JCF_u4)(PTR)[1] << 16) \
  | ((JCF_u4)(PTR)[2] << 8) | ((JCF_u4)(PTR)[3]))
/* Like GET_u4, but for little-endian order. */
#define GET_u4_le(PTR) (((JCF_u4)(PTR)[3] << 24) | ((JCF_u4)(PTR)[2] << 16) \
  | ((JCF_u4)(PTR)[1] << 8) | ((JCF_u4)(PTR)[0]))

/* Make sure there are COUNT bytes readable. */
#define JCF_FILL(JCF, COUNT) \
  ((JCF)->read_end-(JCF)->read_ptr >= (COUNT) ? 0 : (*(JCF)->filbuf)(JCF, COUNT))
#define JCF_GETC(JCF) (JCF_FILL(JCF, 1) ? -1 : *(JCF)->read_ptr++)
#define JCF_READ(JCF, BUFFER, N) \
    (memcpy (BUFFER, (JCF)->read_ptr, N), (JCF)->read_ptr += (N))
#define JCF_SKIP(JCF,N) ((JCF)->read_ptr += (N))
#define JCF_readu(JCF) (*(JCF)->read_ptr++)

/* Reads an unsigned 2-byte integer in network (big-endian) byte-order
   from JCF.  Returns that integer.
   Does not check for EOF (make sure to call JCF_FILL before-hand). */
#define JCF_readu2(JCF) ((JCF)->read_ptr += 2, GET_u2 ((JCF)->read_ptr-2))
#define JCF_readu2_le(JCF) ((JCF)->read_ptr += 2, GET_u2_le((JCF)->read_ptr-2))

/* Like JCF_readu2, but read a 4-byte unsigned integer. */
#define JCF_readu4(JCF) ((JCF)->read_ptr += 4, GET_u4 ((JCF)->read_ptr-4))
#define JCF_readu4_le(JCF) ((JCF)->read_ptr += 4, GET_u4_le((JCF)->read_ptr-4))

#define JCF_TELL(JCF) ((JCF)->read_ptr - (JCF)->buffer)
#define JCF_SEEK(JCF, POS) ((JCF)->read_ptr = (JCF)->buffer + (POS))

#define ACC_PUBLIC 0x0001
#define ACC_PRIVATE 0x0002
#define ACC_PROTECTED 0x0004
#define ACC_STATIC 0x0008
#define ACC_FINAL 0x0010
#define ACC_SYNCHRONIZED 0x0020
#define ACC_SUPER 0x0020
#define ACC_VOLATILE 0x0040
#define ACC_TRANSIENT 0x0080
#define ACC_NATIVE 0x0100
#define ACC_INTERFACE 0x0200
#define ACC_ABSTRACT 0x0400
#define ACC_STRICT 0x0800
/* "Invisible" refers to Miranda methods inserted into an abstract
   #class.  It is also used in the runtime.  */
#define ACC_INVISIBLE 0x1000

#define ACC_VISIBILITY (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED)

#define CONSTANT_Class 7
#define CONSTANT_Fieldref 9
#define CONSTANT_Methodref 10
#define CONSTANT_InterfaceMethodref 11
#define CONSTANT_String 8
#define CONSTANT_Integer 3
#define CONSTANT_Float 4
#define CONSTANT_Long 5
#define CONSTANT_Double 6
#define CONSTANT_NameAndType 12
#define CONSTANT_Utf8 1
#define CONSTANT_Unicode 2

#define DEFAULT_CLASS_PATH "."

extern const char *find_class (const char *, int, JCF*, int);
extern const char *find_classfile (char *, JCF*, const char *);
extern int jcf_filbuf_from_stdio (JCF *jcf, int count);
extern int jcf_unexpected_eof (JCF*, int) ATTRIBUTE_NORETURN;

/* Extract a character from a Java-style Utf8 string.
 * PTR points to the current character.
 * LIMIT points to the end of the Utf8 string.
 * PTR is incremented to point after the character that gets returned.
 * On an error, -1 is returned. */
#define UTF8_GET(PTR, LIMIT) \
  ((PTR) >= (LIMIT) ? -1 \
   : *(PTR) < 128 ? *(PTR)++ \
   : (*(PTR)&0xE0) == 0xC0 && ((PTR)+=2)<=(LIMIT) && ((PTR)[-1]&0xC0) == 0x80 \
   ? (((PTR)[-2] & 0x1F) << 6) + ((PTR)[-1] & 0x3F) \
   : (*(PTR) & 0xF0) == 0xE0 && ((PTR) += 3) <= (LIMIT) \
   && ((PTR)[-2] & 0xC0) == 0x80 && ((PTR)[-1] & 0xC0) == 0x80 \
   ? (((PTR)[-3]&0x0F) << 12) + (((PTR)[-2]&0x3F) << 6) + ((PTR)[-1]&0x3F) \
   : ((PTR)++, -1))

extern const char *jcf_write_base_directory;

/* Debug macros, for the front end */

extern int quiet_flag;
#ifdef VERBOSE_SKELETON
#undef SOURCE_FRONTEND_DEBUG
#define SOURCE_FRONTEND_DEBUG(X)				\
  {if (!quiet_flag) {printf ("* "); printf X; putchar ('\n');} }
#else
#define SOURCE_FRONTEND_DEBUG(X)
#endif

/* Declarations for dependency code.  */
extern void jcf_dependency_reset (void);
extern void jcf_dependency_set_target (const char *);
extern void jcf_dependency_add_target (const char *);
extern void jcf_dependency_set_dep_file (const char *);
extern void jcf_dependency_add_file (const char *, int);
extern void jcf_dependency_write (void);
extern void jcf_dependency_init (int);
extern void jcf_dependency_print_dummies (void);

/* Declarations for path handling code.  */
extern void jcf_path_init (void);
extern void jcf_path_classpath_arg (const char *);
extern void jcf_path_bootclasspath_arg (const char *);
extern void jcf_path_extdirs_arg (const char *);
extern void jcf_path_include_arg (const char *);
extern void jcf_path_seal (int);
extern void *jcf_path_start (void);
extern void *jcf_path_next (void *);
extern char *jcf_path_name (void *);
extern int jcf_path_is_zipfile (void *);
extern int jcf_path_is_system (void *);
extern int jcf_path_max_len (void);

#endif /* ! GCC_JCF_H */