1 /* 2 * Copyright (c) 1997, 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 #ifndef SHARE_VM_RUNTIME_JAVACALLS_HPP 26 #define SHARE_VM_RUNTIME_JAVACALLS_HPP 27 28 #include "memory/allocation.hpp" 29 #include "oops/methodOop.hpp" 30 #include "runtime/handles.hpp" 31 #include "runtime/javaFrameAnchor.hpp" 32 #include "runtime/vmThread.hpp" 33 #ifdef TARGET_ARCH_x86 34 # include "jniTypes_x86.hpp" 35 #endif 36 #ifdef TARGET_ARCH_sparc 37 # include "jniTypes_sparc.hpp" 38 #endif 39 #ifdef TARGET_ARCH_zero 40 # include "jniTypes_zero.hpp" 41 #endif 42 #ifdef TARGET_OS_FAMILY_linux 43 # include "thread_linux.inline.hpp" 44 #endif 45 #ifdef TARGET_OS_FAMILY_solaris 46 # include "thread_solaris.inline.hpp" 47 #endif 48 #ifdef TARGET_OS_FAMILY_windows 49 # include "thread_windows.inline.hpp" 50 #endif 51 52 // A JavaCallWrapper is constructed before each JavaCall and destructed after the call. 53 // Its purpose is to allocate/deallocate a new handle block and to save/restore the last 54 // Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack. 55 56 class JavaCallWrapper: StackObj { 57 friend class VMStructs; 58 private: 59 JavaThread* _thread; // the thread to which this call belongs 60 JNIHandleBlock* _handles; // the saved handle block 61 methodOop _callee_method; // to be able to collect arguments if entry frame is top frame 62 oop _receiver; // the receiver of the call (if a non-static call) 63 64 JavaFrameAnchor _anchor; // last thread anchor state that we must restore 65 66 JavaValue* _result; // result value 67 68 public: 69 // Construction/destruction 70 JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS); 71 ~JavaCallWrapper(); 72 73 // Accessors 74 JavaThread* thread() const { return _thread; } 75 JNIHandleBlock* handles() const { return _handles; } 76 77 JavaFrameAnchor* anchor(void) { return &_anchor; } 78 79 JavaValue* result() const { return _result; } 80 // GC support 81 methodOop callee_method() { return _callee_method; } 82 oop receiver() { return _receiver; } 83 void oops_do(OopClosure* f); 84 85 }; 86 87 88 // Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args) 89 class JavaCallArguments : public StackObj { 90 private: 91 enum Constants { 92 _default_size = 8 // Must be at least # of arguments in JavaCalls methods 93 }; 94 95 intptr_t _value_buffer [_default_size + 1]; 96 bool _is_oop_buffer[_default_size + 1]; 97 98 intptr_t* _value; 99 bool* _is_oop; 100 int _size; 101 int _max_size; 102 bool _start_at_zero; // Support late setting of receiver 103 104 void initialize() { 105 // Starts at first element to support set_receiver. 106 _value = &_value_buffer[1]; 107 _is_oop = &_is_oop_buffer[1]; 108 109 _max_size = _default_size; 110 _size = 0; 111 _start_at_zero = false; 112 } 113 114 public: 115 JavaCallArguments() { initialize(); } 116 117 JavaCallArguments(Handle receiver) { 118 initialize(); 119 push_oop(receiver); 120 } 121 122 JavaCallArguments(int max_size) { 123 if (max_size > _default_size) { 124 _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1); 125 _is_oop = NEW_RESOURCE_ARRAY(bool, max_size + 1); 126 127 // Reserve room for potential receiver in value and is_oop 128 _value++; _is_oop++; 129 130 _max_size = max_size; 131 _size = 0; 132 _start_at_zero = false; 133 } else { 134 initialize(); 135 } 136 } 137 138 inline void push_oop(Handle h) { _is_oop[_size] = true; 139 JNITypes::put_obj((oop)h.raw_value(), _value, _size); } 140 141 inline void push_int(int i) { _is_oop[_size] = false; 142 JNITypes::put_int(i, _value, _size); } 143 144 inline void push_double(double d) { _is_oop[_size] = false; _is_oop[_size + 1] = false; 145 JNITypes::put_double(d, _value, _size); } 146 147 inline void push_long(jlong l) { _is_oop[_size] = false; _is_oop[_size + 1] = false; 148 JNITypes::put_long(l, _value, _size); } 149 150 inline void push_float(float f) { _is_oop[_size] = false; 151 JNITypes::put_float(f, _value, _size); } 152 153 // receiver 154 Handle receiver() { 155 assert(_size > 0, "must at least be one argument"); 156 assert(_is_oop[0], "first argument must be an oop"); 157 assert(_value[0] != 0, "receiver must be not-null"); 158 return Handle((oop*)_value[0], false); 159 } 160 161 void set_receiver(Handle h) { 162 assert(_start_at_zero == false, "can only be called once"); 163 _start_at_zero = true; 164 _is_oop--; 165 _value--; 166 _size++; 167 _is_oop[0] = true; 168 _value[0] = (intptr_t)h.raw_value(); 169 } 170 171 // Converts all Handles to oops, and returns a reference to parameter vector 172 intptr_t* parameters() ; 173 int size_of_parameters() const { return _size; } 174 175 // Verify that pushed arguments fits a given method 176 void verify(methodHandle method, BasicType return_type, Thread *thread); 177 }; 178 179 // All calls to Java have to go via JavaCalls. Sets up the stack frame 180 // and makes sure that the last_Java_frame pointers are chained correctly. 181 // 182 183 class JavaCalls: AllStatic { 184 static void call_helper(JavaValue* result, methodHandle* method, JavaCallArguments* args, TRAPS); 185 public: 186 // Optimized Constuctor call 187 static void call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS); 188 189 // call_special 190 // ------------ 191 // The receiver must be first oop in argument list 192 static void call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS); 193 194 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); // No args 195 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS); 196 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS); 197 198 // virtual call 199 // ------------ 200 201 // The receiver must be first oop in argument list 202 static void call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS); 203 204 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS); // No args 205 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS); 206 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS); 207 208 // Static call 209 // ----------- 210 static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS); 211 212 static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); 213 static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS); 214 static void call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS); 215 216 // Low-level interface 217 static void call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS); 218 }; 219 220 #endif // SHARE_VM_RUNTIME_JAVACALLS_HPP