1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "ci/ciSymbol.hpp"
  27 #include "ci/ciUtilities.hpp"
  28 #include "memory/oopFactory.hpp"
  29 
  30 // ------------------------------------------------------------------
  31 // ciSymbol::ciSymbol
  32 //
  33 // Preallocated handle variant.  Used with handles from vmSymboHandles.
  34 ciSymbol::ciSymbol(symbolHandle h_s, vmSymbols::SID sid)
  35   : ciObject(h_s), _sid(sid)
  36 {
  37   assert(sid_ok(), "must be in vmSymbols");
  38 }
  39 
  40 // Normal case for non-famous symbols.
  41 ciSymbol::ciSymbol(symbolOop s)
  42   : ciObject(s), _sid(vmSymbols::NO_SID)
  43 {
  44   assert(sid_ok(), "must not be in vmSymbols");
  45 }
  46 
  47 // ciSymbol
  48 //
  49 // This class represents a symbolOop in the HotSpot virtual
  50 // machine.
  51 
  52 // ------------------------------------------------------------------
  53 // ciSymbol::as_utf8
  54 //
  55 // The text of the symbol as a null-terminated C string.
  56 const char* ciSymbol::as_utf8() {
  57   VM_QUICK_ENTRY_MARK;
  58   symbolOop s = get_symbolOop();
  59   return s->as_utf8();
  60 }
  61 
  62 // ------------------------------------------------------------------
  63 // ciSymbol::base
  64 jbyte* ciSymbol::base() {
  65   GUARDED_VM_ENTRY(return get_symbolOop()->base();)
  66 }
  67 
  68 // ------------------------------------------------------------------
  69 // ciSymbol::byte_at
  70 int ciSymbol::byte_at(int i) {
  71   GUARDED_VM_ENTRY(return get_symbolOop()->byte_at(i);)
  72 }
  73 
  74 // ------------------------------------------------------------------
  75 // ciSymbol::starts_with
  76 //
  77 // Tests if the symbol starts with the given prefix.
  78 bool ciSymbol::starts_with(const char* prefix, int len) const {
  79   GUARDED_VM_ENTRY(return get_symbolOop()->starts_with(prefix, len);)
  80 }
  81 
  82 // ------------------------------------------------------------------
  83 // ciSymbol::index_of
  84 //
  85 // Determines where the symbol contains the given substring.
  86 int ciSymbol::index_of_at(int i, const char* str, int len) const {
  87   GUARDED_VM_ENTRY(return get_symbolOop()->index_of_at(i, str, len);)
  88 }
  89 
  90 // ------------------------------------------------------------------
  91 // ciSymbol::utf8_length
  92 int ciSymbol::utf8_length() {
  93   GUARDED_VM_ENTRY(return get_symbolOop()->utf8_length();)
  94 }
  95 
  96 // ------------------------------------------------------------------
  97 // ciSymbol::print_impl
  98 //
  99 // Implementation of the print method
 100 void ciSymbol::print_impl(outputStream* st) {
 101   st->print(" value=");
 102   print_symbol_on(st);
 103 }
 104 
 105 // ------------------------------------------------------------------
 106 // ciSymbol::print_symbol_on
 107 //
 108 // Print the value of this symbol on an outputStream
 109 void ciSymbol::print_symbol_on(outputStream *st) {
 110   GUARDED_VM_ENTRY(get_symbolOop()->print_symbol_on(st);)
 111 }
 112 
 113 // ------------------------------------------------------------------
 114 // ciSymbol::make_impl
 115 //
 116 // Make a ciSymbol from a C string (implementation).
 117 ciSymbol* ciSymbol::make_impl(const char* s) {
 118   EXCEPTION_CONTEXT;
 119   // For some reason, oopFactory::new_symbol doesn't declare its
 120   // char* argument as const.
 121   symbolOop sym = oopFactory::new_symbol((char*)s, (int)strlen(s), THREAD);
 122   if (HAS_PENDING_EXCEPTION) {
 123     CLEAR_PENDING_EXCEPTION;
 124     CURRENT_THREAD_ENV->record_out_of_memory_failure();
 125     return ciEnv::_unloaded_cisymbol;
 126   }
 127   return CURRENT_THREAD_ENV->get_object(sym)->as_symbol();
 128 }
 129 
 130 // ------------------------------------------------------------------
 131 // ciSymbol::make
 132 //
 133 // Make a ciSymbol from a C string.
 134 ciSymbol* ciSymbol::make(const char* s) {
 135   GUARDED_VM_ENTRY(return make_impl(s);)
 136 }