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/* Java(TM) language-specific utility routines.

   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,

   2005, 2006, 2007, 2008 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 3, 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 COPYING3.  If not see

<http://www.gnu.org/licenses/>.

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.  */

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

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "tree.h"

#include "input.h"

#include "rtl.h"

#include "expr.h"

#include "java-tree.h"

#include "jcf.h"

#include "toplev.h"

#include "langhooks.h"

#include "langhooks-def.h"

#include "flags.h"

#include "ggc.h"

#include "diagnostic.h"

#include "tree-inline.h"

#include "splay-tree.h"

#include "tree-dump.h"

#include "opts.h"

#include "options.h"

#include "except.h"

static bool java_init (void);

static void java_finish (void);

static unsigned int java_init_options (unsigned int, const char **);

static bool java_post_options (const char **);

static int java_handle_option (size_t scode, const char *arg, int value);

static void put_decl_string (const char *, int);

static void put_decl_node (tree, int);

static void java_print_error_function (diagnostic_context *, const char *,

                                       diagnostic_info *);

static int merge_init_test_initialization (void * *, void *);

static int inline_init_test_initialization (void * *, void *);

static bool java_dump_tree (void *, tree);

static void dump_compound_expr (dump_info_p, tree);

static bool java_decl_ok_for_sibcall (const_tree);

static enum classify_record java_classify_record (tree type);

static tree java_eh_personality (void);

#ifndef TARGET_OBJECT_SUFFIX

# define TARGET_OBJECT_SUFFIX ".o"

#endif

/* Table of machine-independent attributes.  */

const struct attribute_spec java_attribute_table[] =

{

 { "nonnull",                0, -1, false, true, true,

                              NULL },

  { NULL,                     0, 0, false, false, false, NULL }

};

/* Used to avoid printing error messages with bogus function

   prototypes.  Starts out false.  */

static bool inhibit_error_function_printing;

const char *resource_name;

/* When nonzero, -Wall was turned on.  */

int flag_wall = 0;

/* When nonzero, report use of deprecated classes, methods, or fields.  */

int flag_deprecated = 1;

/* When zero, don't optimize static class initialization. This flag shouldn't

   be tested alone, use STATIC_CLASS_INITIALIZATION_OPTIMIZATION_P instead.  */

/* FIXME: Make this work with gimplify.  */

/* int flag_optimize_sci = 0;  */

/* Don't attempt to verify invocations.  */

int flag_verify_invocations = 0;

/* When nonzero, print extra version information.  */

static int v_flag = 0;

JCF *current_jcf;

/* Variable controlling how dependency tracking is enabled in

   java_init.  */

static int dependency_tracking = 0;

/* Flag values for DEPENDENCY_TRACKING.  */

#define DEPEND_SET_FILE 1

#define DEPEND_ENABLE   2

#define DEPEND_TARGET_SET 4

#define DEPEND_FILE_ALREADY_SET 8

struct GTY(()) language_function {

  int unused;

};

#undef LANG_HOOKS_NAME

#define LANG_HOOKS_NAME "GNU Java"

#undef LANG_HOOKS_INIT

#define LANG_HOOKS_INIT java_init

#undef LANG_HOOKS_FINISH

#define LANG_HOOKS_FINISH java_finish

#undef LANG_HOOKS_INIT_OPTIONS

#define LANG_HOOKS_INIT_OPTIONS java_init_options

#undef LANG_HOOKS_HANDLE_OPTION

#define LANG_HOOKS_HANDLE_OPTION java_handle_option

#undef LANG_HOOKS_POST_OPTIONS

#define LANG_HOOKS_POST_OPTIONS java_post_options

#undef LANG_HOOKS_PARSE_FILE

#define LANG_HOOKS_PARSE_FILE java_parse_file

#undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL

#define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL java_dup_lang_specific_decl

#undef LANG_HOOKS_DECL_PRINTABLE_NAME

#define LANG_HOOKS_DECL_PRINTABLE_NAME lang_printable_name

#undef LANG_HOOKS_PRINT_ERROR_FUNCTION

#define LANG_HOOKS_PRINT_ERROR_FUNCTION java_print_error_function

#undef LANG_HOOKS_TYPE_FOR_MODE

#define LANG_HOOKS_TYPE_FOR_MODE java_type_for_mode

#undef LANG_HOOKS_TYPE_FOR_SIZE

#define LANG_HOOKS_TYPE_FOR_SIZE java_type_for_size

#undef LANG_HOOKS_CLASSIFY_RECORD

#define LANG_HOOKS_CLASSIFY_RECORD java_classify_record

#undef LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN

#define LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN java_dump_tree

#undef LANG_HOOKS_GIMPLIFY_EXPR

#define LANG_HOOKS_GIMPLIFY_EXPR java_gimplify_expr

#undef LANG_HOOKS_DECL_OK_FOR_SIBCALL

#define LANG_HOOKS_DECL_OK_FOR_SIBCALL java_decl_ok_for_sibcall

#undef LANG_HOOKS_SET_DECL_ASSEMBLER_NAME

#define LANG_HOOKS_SET_DECL_ASSEMBLER_NAME java_mangle_decl

#undef LANG_HOOKS_ATTRIBUTE_TABLE

#define LANG_HOOKS_ATTRIBUTE_TABLE java_attribute_table

#undef LANG_HOOKS_EH_PERSONALITY

#define LANG_HOOKS_EH_PERSONALITY java_eh_personality

#undef LANG_HOOKS_EH_USE_CXA_END_CLEANUP

#define LANG_HOOKS_EH_USE_CXA_END_CLEANUP  true

/* Each front end provides its own.  */

struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

/*

 * process java-specific compiler command-line options

 * return 0, but do not complain if the option is not recognized.

 */

static int

java_handle_option (size_t scode, const char *arg, int value)

{

  enum opt_code code = (enum opt_code) scode;

  switch (code)

    {

    case OPT_I:

      jcf_path_include_arg (arg);

      break;

    case OPT_M:

      jcf_dependency_init (1);

      dependency_tracking |= DEPEND_ENABLE;

      break;

    case OPT_MD_:

      jcf_dependency_init (1);

      dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;

      break;

    case OPT_MF:

      jcf_dependency_set_dep_file (arg);

      dependency_tracking |= DEPEND_FILE_ALREADY_SET;

      break;

    case OPT_MM:

      jcf_dependency_init (0);

      dependency_tracking |= DEPEND_ENABLE;

      break;

    case OPT_MMD_:

      jcf_dependency_init (0);

      dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;

      break;

    case OPT_MP:

      jcf_dependency_print_dummies ();

      break;

    case OPT_MT:

      jcf_dependency_set_target (arg);

      dependency_tracking |= DEPEND_TARGET_SET;

      break;

    case OPT_Wall:

      flag_wall = value;

      /* When -Wall given, enable -Wunused.  We do this because the C

         compiler does it, and people expect it.  */

      warn_unused = value;

      break;

    case OPT_fenable_assertions_:

      add_enable_assert (arg, value);

      break;

    case OPT_fenable_assertions:

      add_enable_assert ("", value);

      break;

    case OPT_fdisable_assertions_:

      add_enable_assert (arg, !value);

      break;

    case OPT_fdisable_assertions:

      add_enable_assert ("", !value);

      break;

    case OPT_fassume_compiled_:

      add_assume_compiled (arg, !value);

      break;

    case OPT_fassume_compiled:

      add_assume_compiled ("", !value);

      break;

    case OPT_fbootclasspath_:

      jcf_path_bootclasspath_arg (arg);

      break;

    case OPT_faux_classpath:

    case OPT_fclasspath_:

    case OPT_fCLASSPATH_:

      jcf_path_classpath_arg (arg);

      break;

    case OPT_fcompile_resource_:

      resource_name = arg;

      break;

    case OPT_fdump_:

      if (!dump_switch_p (arg))

        return 0;

      break;

    case OPT_fencoding_:

      /* Nothing.  */

      break;

    case OPT_fextdirs_:

      jcf_path_extdirs_arg (arg);

      break;

    case OPT_foutput_class_dir_:

      /* FIXME: remove; this is handled by ecj1 now.  */

      break;

    case OPT_version:

      v_flag = 1;

      break;

    case OPT_fsource_filename_:

      java_read_sourcefilenames (arg);

      break;

    default:

      if (cl_options[code].flags & CL_Java)

        break;

      gcc_unreachable ();

    }

  return 1;

}

/* Global open file.  */

FILE *finput;

static bool

java_init (void)

{

  /* FIXME: Indirect dispatch isn't yet compatible with static class

     init optimization.  */

  if (flag_indirect_dispatch)

    always_initialize_class_p = true;

  if (!flag_indirect_dispatch)

    flag_indirect_classes = false;

  jcf_path_seal (v_flag);

  java_init_decl_processing ();

  using_eh_for_cleanups ();

  return true;

}

static void

java_finish (void)

{

  jcf_dependency_write ();

}

/* Buffer used by lang_printable_name. */

static char *decl_buf = NULL;

/* Allocated size of decl_buf. */

static int decl_buflen = 0;

/* Length of used part of decl_buf;  position for next character. */

static int decl_bufpos = 0;

/* Append the string STR to decl_buf.

   It length is given by LEN;  -1 means the string is nul-terminated. */

static void

put_decl_string (const char *str, int len)

{

  if (len < 0)

    len = strlen (str);

  if (decl_bufpos + len >= decl_buflen)

    {

      if (decl_buf == NULL)

        {

          decl_buflen = len + 100;

          decl_buf = XNEWVEC (char, decl_buflen);

        }

      else

        {

          decl_buflen *= 2;

          decl_buf = XRESIZEVAR (char, decl_buf, decl_buflen);

        }

    }

  strcpy (decl_buf + decl_bufpos, str);

  decl_bufpos += len;

}

/* Append to decl_buf a printable name for NODE.

   Depending on VERBOSITY, more information about NODE

   is printed. Read the comments of decl_printable_name in

   langhooks.h for more.  */

static void

put_decl_node (tree node, int verbosity)

{

  int was_pointer = 0;

  if (TREE_CODE (node) == POINTER_TYPE)

    {

      node = TREE_TYPE (node);

      was_pointer = 1;

    }

  if (DECL_P (node) && DECL_NAME (node) != NULL_TREE)

    {

      if (TREE_CODE (node) == FUNCTION_DECL)

        {

          if (verbosity == 0 && DECL_NAME (node))

          /* We have been instructed to just print the bare name

             of the function.  */

            {

              put_decl_node (DECL_NAME (node), 0);

              return;

            }

          /* We want to print the type the DECL belongs to. We don't do

             that when we handle constructors. */

          if (! DECL_CONSTRUCTOR_P (node)

              && ! DECL_ARTIFICIAL (node) && DECL_CONTEXT (node)

              /* We want to print qualified DECL names only

                 if verbosity is higher than 1.  */

              && verbosity >= 1)

            {

              put_decl_node (TYPE_NAME (DECL_CONTEXT (node)),

                               verbosity);

              put_decl_string (".", 1);

            }

          if (! DECL_CONSTRUCTOR_P (node))

            put_decl_node (DECL_NAME (node), verbosity);

          if (TREE_TYPE (node) != NULL_TREE

              /* We want to print function parameters only if verbosity

                 is higher than 2.  */

              && verbosity >= 2)

            {

              int i = 0;

              tree args = TYPE_ARG_TYPES (TREE_TYPE (node));

              if (TREE_CODE (TREE_TYPE (node)) == METHOD_TYPE)

                args = TREE_CHAIN (args);

              put_decl_string ("(", 1);

              for ( ; args != end_params_node;  args = TREE_CHAIN (args), i++)

                {

                  if (i > 0)

                    put_decl_string (",", 1);

                  put_decl_node (TREE_VALUE (args), verbosity);

                }

              put_decl_string (")", 1);

            }

        }

      else

        put_decl_node (DECL_NAME (node), verbosity);

    }

  else if (TYPE_P (node) && TYPE_NAME (node) != NULL_TREE)

    {

      if (TREE_CODE (node) == RECORD_TYPE && TYPE_ARRAY_P (node)

          /* Print detailed array information only if verbosity is higher

            than 2.  */

          && verbosity >= 2)

        {

          put_decl_node (TYPE_ARRAY_ELEMENT (node), verbosity);

          put_decl_string("[]", 2);

        }

      else if (node == promoted_byte_type_node)

        put_decl_string ("byte", 4);

      else if (node == promoted_short_type_node)

        put_decl_string ("short", 5);

      else if (node == promoted_char_type_node)

        put_decl_string ("char", 4);

      else if (node == promoted_boolean_type_node)

        put_decl_string ("boolean", 7);

      else if (node == void_type_node && was_pointer)

        put_decl_string ("null", 4);

      else

        put_decl_node (TYPE_NAME (node), verbosity);

    }

  else if (TREE_CODE (node) == IDENTIFIER_NODE)

    put_decl_string (IDENTIFIER_POINTER (node), IDENTIFIER_LENGTH (node));

  else

    put_decl_string ("<unknown>", -1);

}

/* Return a user-friendly name for DECL.

   The resulting string is only valid until the next call.

   The value of the hook decl_printable_name is this function,

   which is also called directly by java_print_error_function. */

const char *

lang_printable_name (tree decl, int v)

{

  decl_bufpos = 0;

  put_decl_node (decl, v);

  put_decl_string ("", 1);

  return decl_buf;

}

/* Print on stderr the current class and method context.  This function

   is the value of the hook print_error_function. */

static GTY(()) tree last_error_function_context;

static GTY(()) tree last_error_function;

static void

java_print_error_function (diagnostic_context *context ATTRIBUTE_UNUSED,

                           const char *file,

                           diagnostic_info *diagnostic ATTRIBUTE_UNUSED)

{

  /* Don't print error messages with bogus function prototypes.  */

  if (inhibit_error_function_printing)

    return;

  if (current_function_decl != NULL

      && DECL_CONTEXT (current_function_decl) != last_error_function_context)

    {

      if (file)

        fprintf (stderr, "%s: ", file);

      last_error_function_context = DECL_CONTEXT (current_function_decl);

      fprintf (stderr, "In class '%s':\n",

               lang_printable_name (last_error_function_context, 0));

    }

  if (last_error_function != current_function_decl)

    {

      if (file)

        fprintf (stderr, "%s: ", file);

      if (current_function_decl == NULL)

        fprintf (stderr, "At top level:\n");

      else

        {

          const char *name = lang_printable_name (current_function_decl, 2);

          fprintf (stderr, "In %s '%s':\n",

                   (DECL_CONSTRUCTOR_P (current_function_decl) ? "constructor"

                    : "method"),

                   name);

        }

      last_error_function = current_function_decl;

    }

}

/* Called to install the PRINT_ERROR_FUNCTION hook differently

   according to LEVEL. LEVEL is 1 during early parsing, when function

   prototypes aren't fully resolved. java_print_error_function is set

   so it doesn't print incomplete function prototypes. When LEVEL is

   2, function prototypes are fully resolved and can be printed when

   reporting errors.  */

void

lang_init_source (int level)

{

  inhibit_error_function_printing = (level == 1);

}

static unsigned int

java_init_options (unsigned int argc ATTRIBUTE_UNUSED,

                   const char **argv ATTRIBUTE_UNUSED)

{

  flag_bounds_check = 1;

  flag_exceptions = 1;

  flag_non_call_exceptions = 1;

  /* In Java floating point operations never trap.  */

  flag_trapping_math = 0;

  /* In Java arithmetic overflow always wraps around.  */

  flag_wrapv = 1;

  /* Java requires left-to-right evaluation of subexpressions.  */

  flag_evaluation_order = 1;

  jcf_path_init ();

  return CL_Java;

}

/* Post-switch processing.  */

static bool

java_post_options (const char **pfilename)

{

  const char *filename = *pfilename;

  /* Excess precision other than "fast" requires front-end

     support.  */

  if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD

      && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)

    sorry ("-fexcess-precision=standard for Java");

  flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;

  /* An absolute requirement: if we're not using indirect dispatch, we

     must always verify everything.  */

  if (! flag_indirect_dispatch)

    flag_verify_invocations = true;

  if (flag_reduced_reflection)

    {

      if (flag_indirect_dispatch)

        error ("-findirect-dispatch is incompatible "

               "with -freduced-reflection");

      if (flag_jni)

        error ("-fjni is incompatible with -freduced-reflection");

    }

  /* Open input file.  */

  if (filename == 0 || !strcmp (filename, "-"))

    {

      finput = stdin;

      filename = "stdin";

      if (dependency_tracking)

        error ("can't do dependency tracking with input from stdin");

    }

  else

    {

      if (dependency_tracking)

        {

          const char *dot;

          /* If the target is set and the output filename is set, then

             there's no processing to do here.  Otherwise we must

             compute one or the other.  */

          if (! ((dependency_tracking & DEPEND_TARGET_SET)

                 && (dependency_tracking & DEPEND_FILE_ALREADY_SET)))

            {

              dot = strrchr (filename, '.');

              if (dot == NULL)

                error ("couldn't determine target name for dependency tracking");

              else

                {

                  char *buf = XNEWVEC (char, dot - filename +

                                       3 + sizeof (TARGET_OBJECT_SUFFIX));

                  strncpy (buf, filename, dot - filename);

                  /* If emitting class files, we might have multiple

                     targets.  The class generation code takes care of

                     registering them.  Otherwise we compute the

                     target name here.  */

                  if ((dependency_tracking & DEPEND_TARGET_SET))

                    ; /* Nothing.  */

                  else

                    {

                      strcpy (buf + (dot - filename), TARGET_OBJECT_SUFFIX);

                      jcf_dependency_set_target (buf);

                    }

                  if ((dependency_tracking & DEPEND_FILE_ALREADY_SET))

                    ; /* Nothing.  */

                  else if ((dependency_tracking & DEPEND_SET_FILE))

                    {

                      strcpy (buf + (dot - filename), ".d");

                      jcf_dependency_set_dep_file (buf);

                    }

                  else

                    jcf_dependency_set_dep_file ("-");

                  free (buf);

                }

            }

        }

    }

  linemap_add (line_table, LC_ENTER, false, filename, 0);

  linemap_add (line_table, LC_RENAME, false, "<built-in>", 0);

  /* Initialize the compiler back end.  */

  return false;

}

/* Return either DECL or its known constant value (if it has one).  */

tree

decl_constant_value (tree decl)

{

  if (/* Don't change a variable array bound or initial value to a constant

         in a place where a variable is invalid.  */

      current_function_decl != 0

      && ! TREE_THIS_VOLATILE (decl)

      && TREE_READONLY (decl)

      && DECL_INITIAL (decl) != 0

      && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK

      /* This is invalid if initial value is not constant.

         If it has either a function call, a memory reference,

         or a variable, then re-evaluating it could give different results.  */

      && TREE_CONSTANT (DECL_INITIAL (decl))

      /* Check for cases where this is sub-optimal, even though valid.  */

      && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR)

    return DECL_INITIAL (decl);

  return decl;

}

/* Every call to a static constructor has an associated boolean

   variable which is in the outermost scope of the calling method.

   This variable is used to avoid multiple calls to the static

   constructor for each class.

   It looks something like this:

   foo ()

   {

      boolean dummy = OtherClass.is_initialized;

     ...

     if (! dummy)

       OtherClass.initialize();

     ... use OtherClass.data ...

   }

   Each of these boolean variables has an entry in the

   DECL_FUNCTION_INIT_TEST_TABLE of a method.  When inlining a method

   we must merge the DECL_FUNCTION_INIT_TEST_TABLE from the function

   being inlined and create the boolean variables in the outermost

   scope of the method being inlined into.  */

/* Create a mapping from a boolean variable in a method being inlined

   to one in the scope of the method being inlined into.  */

static int

merge_init_test_initialization (void **entry, void *x)

{

  struct treetreehash_entry *ite = (struct treetreehash_entry *) *entry;

  splay_tree decl_map = (splay_tree)x;

  splay_tree_node n;

  tree *init_test_decl;

  /* See if we have remapped this declaration.  If we haven't there's

     a bug in the inliner.  */

  n = splay_tree_lookup (decl_map, (splay_tree_key) ite->value);

  gcc_assert (n);

  /* Create a new entry for the class and its remapped boolean

     variable.  If we already have a mapping for this class we've

     already initialized it, so don't overwrite the value.  */

  init_test_decl = java_treetreehash_new

    (DECL_FUNCTION_INIT_TEST_TABLE (current_function_decl), ite->key);

  if (!*init_test_decl)

    *init_test_decl = (tree)n->value;

  /* This fixes a weird case.

  The front end assumes that once we have called a method that

  initializes some class, we can assume the class is initialized.  It

  does this by setting the DECL_INITIAL of the init_test_decl for that

  class, and no initializations are emitted for that class.

  However, what if the method that is supposed to do the initialization

  is itself inlined in the caller?  When expanding the called method

  we'll assume that the class initialization has already been done,

  because the DECL_INITIAL of the init_test_decl is set.