--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/prims/nativeLookup.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,290 @@
+/*
+ * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_nativeLookup.cpp.incl"
+
+
+static void mangle_name_on(outputStream* st, symbolOop name, int begin, int end) {
+  char* bytes = (char*)name->bytes() + begin;
+  char* end_bytes = (char*)name->bytes() + end;
+  while (bytes < end_bytes) {
+    jchar c;
+    bytes = UTF8::next(bytes, &c);
+    if (c <= 0x7f && isalnum(c)) {
+      st->put((char) c);
+    } else {
+           if (c == '_') st->print("_1");
+      else if (c == '/') st->print("_");
+      else if (c == ';') st->print("_2");
+      else if (c == '[') st->print("_3");
+      else               st->print("_%.5x", c);
+    }
+  }
+}
+
+
+static void mangle_name_on(outputStream* st, symbolOop name) {
+  mangle_name_on(st, name, 0, name->utf8_length());
+}
+
+
+char* NativeLookup::pure_jni_name(methodHandle method) {
+  stringStream st;
+  // Prefix
+  st.print("Java_");
+  // Klass name
+  mangle_name_on(&st, method->klass_name());
+  st.print("_");
+  // Method name
+  mangle_name_on(&st, method->name());
+  return st.as_string();
+}
+
+
+char* NativeLookup::long_jni_name(methodHandle method) {
+  // Signature ignore the wrapping parenteses and the trailing return type
+  stringStream st;
+  symbolOop signature = method->signature();
+  st.print("__");
+  // find ')'
+  int end;
+  for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++);
+  // skip first '('
+  mangle_name_on(&st, signature, 1, end);
+  return st.as_string();
+}
+
+extern "C" {
+  void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls);
+  void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass);
+}
+
+static address lookup_special_native(char* jni_name) {
+  // NB: To ignore the jni prefix and jni postfix strstr is used matching.
+  if (!JDK_Version::is_gte_jdk14x_version()) {
+    // These functions only exist for compatibility with 1.3.1 and earlier
+    // Intercept ObjectOutputStream getPrimitiveFieldValues for faster serialization
+    if (strstr(jni_name, "Java_java_io_ObjectOutputStream_getPrimitiveFieldValues") != NULL) {
+      return CAST_FROM_FN_PTR(address, JVM_GetPrimitiveFieldValues);
+    }
+    // Intercept ObjectInputStream setPrimitiveFieldValues for faster serialization
+    if (strstr(jni_name, "Java_java_io_ObjectInputStream_setPrimitiveFieldValues") != NULL) {
+      return CAST_FROM_FN_PTR(address, JVM_SetPrimitiveFieldValues);
+    }
+  }
+  if (strstr(jni_name, "Java_sun_misc_Unsafe_registerNatives") != NULL) {
+    return CAST_FROM_FN_PTR(address, JVM_RegisterUnsafeMethods);
+  }
+  if (strstr(jni_name, "Java_sun_misc_Perf_registerNatives") != NULL) {
+    return CAST_FROM_FN_PTR(address, JVM_RegisterPerfMethods);
+  }
+
+  return NULL;
+}
+
+address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) {
+  address entry;
+  // Compute complete JNI name for style
+  stringStream st;
+  if (os_style) os::print_jni_name_prefix_on(&st, args_size);
+  st.print_raw(pure_name);
+  st.print_raw(long_name);
+  if (os_style) os::print_jni_name_suffix_on(&st, args_size);
+  char* jni_name = st.as_string();
+
+  // If the loader is null we have a system class, so we attempt a lookup in
+  // the native Java library. This takes care of any bootstrapping problems.
+  // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find
+  // gets found the first time around - otherwise an infinite loop can occure. This is
+  // another VM/library dependency
+  Handle loader(THREAD,
+                instanceKlass::cast(method->method_holder())->class_loader());
+  if (loader.is_null()) {
+    entry = lookup_special_native(jni_name);
+    if (entry == NULL) {
+       entry = (address) hpi::dll_lookup(os::native_java_library(), jni_name);
+    }
+    if (entry != NULL) {
+      in_base_library = true;
+      return entry;
+    }
+  }
+
+  // Otherwise call static method findNative in ClassLoader
+  KlassHandle   klass (THREAD, SystemDictionary::classloader_klass());
+  Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL);
+
+  JavaValue result(T_LONG);
+  JavaCalls::call_static(&result,
+                         klass,
+                         vmSymbolHandles::findNative_name(),
+                         vmSymbolHandles::classloader_string_long_signature(),
+                         // Arguments
+                         loader,
+                         name_arg,
+                         CHECK_NULL);
+  entry = (address) (intptr_t) result.get_jlong();
+
+  if (entry == NULL) {
+    // findNative didn't find it, if there are any agent libraries look in them
+    AgentLibrary* agent;
+    for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
+      entry = (address) hpi::dll_lookup(agent->os_lib(), jni_name);
+      if (entry != NULL) {
+        return entry;
+      }
+    }
+  }
+
+  return entry;
+}
+
+
+// Check all the formats of native implementation name to see if there is one
+// for the specified method.
+address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) {
+  address entry = NULL;
+  in_base_library = false;
+  // Compute pure name
+  char* pure_name = pure_jni_name(method);
+
+  // Compute argument size
+  int args_size = 1                             // JNIEnv
+                + (method->is_static() ? 1 : 0) // class for static methods
+                + method->size_of_parameters(); // actual parameters
+
+
+  // 1) Try JNI short style
+  entry = lookup_style(method, pure_name, "",        args_size, true,  in_base_library, CHECK_NULL);
+  if (entry != NULL) return entry;
+
+  // Compute long name
+  char* long_name = long_jni_name(method);
+
+  // 2) Try JNI long style
+  entry = lookup_style(method, pure_name, long_name, args_size, true,  in_base_library, CHECK_NULL);
+  if (entry != NULL) return entry;
+
+  // 3) Try JNI short style without os prefix/suffix
+  entry = lookup_style(method, pure_name, "",        args_size, false, in_base_library, CHECK_NULL);
+  if (entry != NULL) return entry;
+
+  // 4) Try JNI long style without os prefix/suffix
+  entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL);
+
+  return entry; // NULL indicates not found
+}
+
+// Check if there are any JVM TI prefixes which have been applied to the native method name.
+// If any are found, remove them before attemping the look up of the
+// native implementation again.
+// See SetNativeMethodPrefix in the JVM TI Spec for more details.
+address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) {
+  ResourceMark rm(THREAD);
+
+  int prefix_count;
+  char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
+  char* in_name = method->name()->as_C_string();
+  char* wrapper_name = in_name;
+  // last applied prefix will be first -- go backwards
+  for (int i = prefix_count-1; i >= 0; i--) {
+    char* prefix = prefixes[i];
+    size_t prefix_len = strlen(prefix);
+    if (strncmp(prefix, wrapper_name, prefix_len) == 0) {
+      // has this prefix remove it
+      wrapper_name += prefix_len;
+    }
+  }
+  if (wrapper_name != in_name) {
+    // we have a name for a wrapping method
+    int wrapper_name_len = (int)strlen(wrapper_name);
+    symbolHandle wrapper_symbol(THREAD, SymbolTable::probe(wrapper_name, wrapper_name_len));
+    if (!wrapper_symbol.is_null()) {
+      KlassHandle kh(method->method_holder());
+      methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol(),
+                                                                  method->signature());
+      if (wrapper_method != NULL && !wrapper_method->is_native()) {
+        // we found a wrapper method, use its native entry
+        method->set_is_prefixed_native();
+        return lookup_entry(wrapper_method, in_base_library, THREAD);
+      }
+    }
+  }
+  return NULL;
+}
+
+address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) {
+  address entry = NULL;
+  ResourceMark rm(THREAD);
+
+  entry = lookup_entry(method, in_base_library, THREAD);
+  if (entry != NULL) return entry;
+
+  // standard native method resolution has failed.  Check if there are any
+  // JVM TI prefixes which have been applied to the native method name.
+  entry = lookup_entry_prefixed(method, in_base_library, THREAD);
+  if (entry != NULL) return entry;
+
+  // Native function not found, throw UnsatisfiedLinkError
+  THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),
+              method->name_and_sig_as_C_string());
+}
+
+
+address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) {
+  if (!method->has_native_function()) {
+    address entry = lookup_base(method, in_base_library, CHECK_NULL);
+    method->set_native_function(entry,
+      methodOopDesc::native_bind_event_is_interesting);
+    // -verbose:jni printing
+    if (PrintJNIResolving) {
+      ResourceMark rm(THREAD);
+      tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",
+        Klass::cast(method->method_holder())->external_name(),
+        method->name()->as_C_string());
+    }
+  }
+  return method->native_function();
+}
+
+address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) {
+  EXCEPTION_MARK;
+  bool in_base_library = true;  // SharedRuntime inits some math methods.
+  symbolHandle c_name = oopFactory::new_symbol_handle(class_name,  CATCH);
+  symbolHandle m_name = oopFactory::new_symbol_handle(method_name, CATCH);
+  symbolHandle s_name = oopFactory::new_symbol_handle(signature,   CATCH);
+
+  // Find the class
+  klassOop k = SystemDictionary::resolve_or_fail(c_name, true, CATCH);
+  instanceKlassHandle klass (THREAD, k);
+
+  // Find method and invoke standard lookup
+  methodHandle method (THREAD,
+                       klass->uncached_lookup_method(m_name(), s_name()));
+  address result = lookup(method, in_base_library, CATCH);
+  assert(in_base_library, "must be in basic library");
+  guarantee(result != NULL, "must be non NULL");
+  return result;
+}