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hotspot/src/share/vm/runtime/javaCalls.hpp

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+/*
+ * Copyright 1997-2005 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.
+ *
+ */
+
+// A JavaCallWrapper is constructed before each JavaCall and destructed after the call.
+// Its purpose is to allocate/deallocate a new handle block and to save/restore the last
+// Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack.
+
+class JavaCallWrapper: StackObj {
+  friend class VMStructs;
+ private:
+  JavaThread*      _thread;                 // the thread to which this call belongs
+  JNIHandleBlock*  _handles;                // the saved handle block
+  methodOop        _callee_method;          // to be able to collect arguments if entry frame is top frame
+  oop              _receiver;               // the receiver of the call (if a non-static call)
+
+  JavaFrameAnchor  _anchor;                 // last thread anchor state that we must restore
+
+  JavaValue*       _result;                 // result value
+
+ public:
+  // Construction/destruction
+   JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS);
+  ~JavaCallWrapper();
+
+  // Accessors
+  JavaThread*      thread() const           { return _thread; }
+  JNIHandleBlock*  handles() const          { return _handles; }
+
+  JavaFrameAnchor* anchor(void)             { return &_anchor; }
+
+  JavaValue*       result() const           { return _result; }
+  // GC support
+  methodOop        callee_method()          { return _callee_method; }
+  oop              receiver()               { return _receiver; }
+  void             oops_do(OopClosure* f);
+
+};
+
+
+// Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args)
+class JavaCallArguments : public StackObj {
+ private:
+  enum Constants {
+   _default_size = 8    // Must be at least # of arguments in JavaCalls methods
+  };
+
+  intptr_t    _value_buffer [_default_size + 1];
+  intptr_t    _parameter_buffer [_default_size*2 + 1];
+  bool        _is_oop_buffer[_default_size + 1];
+
+  intptr_t*   _value;
+  intptr_t*   _parameters;
+  bool*       _is_oop;
+  int         _size;
+  int         _max_size;
+  bool        _start_at_zero;      // Support late setting of receiver
+
+  void initialize() {
+    // Starts at first element to support set_receiver.
+    _value    = &_value_buffer[1];
+    _is_oop   = &_is_oop_buffer[1];
+
+    _parameters = &_parameter_buffer[0];
+    _max_size = _default_size;
+    _size = 0;
+    _start_at_zero = false;
+  }
+
+ public:
+  JavaCallArguments() { initialize(); }
+
+  JavaCallArguments(Handle receiver) {
+    initialize();
+    push_oop(receiver);
+  }
+
+  JavaCallArguments(int max_size) {
+    if (max_size > _default_size) {
+      _value  = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1);
+      _is_oop = NEW_RESOURCE_ARRAY(bool, max_size + 1);
+      if (TaggedStackInterpreter) {
+        _parameters  = NEW_RESOURCE_ARRAY(intptr_t, max_size*2 + 1);
+      }
+      // Reserve room for potential receiver in value and is_oop
+      _value++; _is_oop++;
+      _max_size = max_size;
+      _size = 0;
+      _start_at_zero = false;
+    } else {
+      initialize();
+    }
+  }
+
+  inline void push_oop(Handle h)    { _is_oop[_size] = true;
+                               JNITypes::put_obj((oop)h.raw_value(), _value, _size); }
+
+  inline void push_int(int i)       { _is_oop[_size] = false;
+                               JNITypes::put_int(i, _value, _size); }
+
+  inline void push_double(double d) { _is_oop[_size] = false; _is_oop[_size + 1] = false;
+                               JNITypes::put_double(d, _value, _size); }
+
+  inline void push_long(jlong l)    { _is_oop[_size] = false; _is_oop[_size + 1] = false;
+                               JNITypes::put_long(l, _value, _size); }
+
+  inline void push_float(float f)   { _is_oop[_size] = false;
+                               JNITypes::put_float(f, _value, _size); }
+
+  // receiver
+  Handle receiver() {
+    assert(_size > 0, "must at least be one argument");
+    assert(_is_oop[0], "first argument must be an oop");
+    assert(_value[0] != 0, "receiver must be not-null");
+    return Handle((oop*)_value[0], false);
+  }
+
+  void set_receiver(Handle h) {
+    assert(_start_at_zero == false, "can only be called once");
+    _start_at_zero = true;
+    _is_oop--;
+    _value--;
+    _size++;
+    _is_oop[0] = true;
+    _value[0] = (intptr_t)h.raw_value();
+  }
+
+  // Converts all Handles to oops, and returns a reference to parameter vector
+  intptr_t* parameters() ;
+  int   size_of_parameters() const { return _size; }
+
+  // Verify that pushed arguments fits a given method
+  void verify(methodHandle method, BasicType return_type, Thread *thread) PRODUCT_RETURN;
+};
+
+// All calls to Java have to go via JavaCalls. Sets up the stack frame
+// and makes sure that the last_Java_frame pointers are chained correctly.
+//
+
+class JavaCalls: AllStatic {
+  static void call_helper(JavaValue* result, methodHandle* method, JavaCallArguments* args, TRAPS);
+ public:
+  // Optimized Constuctor call
+  static void call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS);
+
+  // call_special
+  // ------------
+  // The receiver must be first oop in argument list
+  static void call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS);
+
+  static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); // No args
+  static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS);
+  static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS);
+
+  // virtual call
+  // ------------
+
+  // The receiver must be first oop in argument list
+  static void call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS);
+
+  static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS); // No args
+  static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS);
+  static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS);
+
+  // Static call
+  // -----------
+  static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS);
+
+  static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
+  static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS);
+  static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS);
+
+  // Low-level interface
+  static void call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS);
+};