| /* |
| * Copyright 1997-2008 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]; |
| bool _is_oop_buffer[_default_size + 1]; |
| |
| intptr_t* _value; |
| 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]; |
| |
| _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); |
| |
| // 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); |
| }; |
| |
| // 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); |
| }; |