1 /* 2 * Copyright (c) 1997, 2016, 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/method.hpp" 30 #include "runtime/handles.hpp" 31 #include "runtime/javaFrameAnchor.hpp" 32 #include "runtime/thread.hpp" 33 #include "runtime/vmThread.hpp" 34 #include "utilities/macros.hpp" 35 36 #include CPU_HEADER(jniTypes) 37 38 // A JavaCallWrapper is constructed before each JavaCall and destructed after the call. 39 // Its purpose is to allocate/deallocate a new handle block and to save/restore the last 40 // Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack. 41 42 class JavaCallWrapper: StackObj { 43 friend class VMStructs; 44 private: 45 JavaThread* _thread; // the thread to which this call belongs 46 JNIHandleBlock* _handles; // the saved handle block 47 Method* _callee_method; // to be able to collect arguments if entry frame is top frame 48 oop _receiver; // the receiver of the call (if a non-static call) 49 50 JavaFrameAnchor _anchor; // last thread anchor state that we must restore 51 52 JavaValue* _result; // result value 53 54 public: 55 // Construction/destruction 56 JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS); 57 ~JavaCallWrapper(); 58 59 // Accessors 60 JavaThread* thread() const { return _thread; } 61 JNIHandleBlock* handles() const { return _handles; } 62 63 JavaFrameAnchor* anchor(void) { return &_anchor; } 64 65 JavaValue* result() const { return _result; } 66 // GC support 67 Method* callee_method() { return _callee_method; } 68 oop receiver() { return _receiver; } 69 void oops_do(OopClosure* f); 70 71 bool is_first_frame() const { return _anchor.last_Java_sp() == NULL; } 72 73 }; 74 75 76 // Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args) 77 class JavaCallArguments : public StackObj { 78 private: 79 enum Constants { 80 _default_size = 8 // Must be at least # of arguments in JavaCalls methods 81 }; 82 83 intptr_t _value_buffer [_default_size + 1]; 84 bool _is_oop_buffer[_default_size + 1]; 85 86 intptr_t* _value; 87 bool* _is_oop; 88 int _size; 89 int _max_size; 90 bool _start_at_zero; // Support late setting of receiver 91 JVMCI_ONLY(nmethod* _alternative_target;) // Nmethod that should be called instead of normal target 92 93 void initialize() { 94 // Starts at first element to support set_receiver. 95 _value = &_value_buffer[1]; 96 _is_oop = &_is_oop_buffer[1]; 97 98 _max_size = _default_size; 99 _size = 0; 100 _start_at_zero = false; 101 JVMCI_ONLY(_alternative_target = NULL;) 102 } 103 104 public: 105 JavaCallArguments() { initialize(); } 106 107 JavaCallArguments(Handle receiver) { 108 initialize(); 109 push_oop(receiver); 110 } 111 112 JavaCallArguments(int max_size) { 113 if (max_size > _default_size) { 114 _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1); 115 _is_oop = NEW_RESOURCE_ARRAY(bool, max_size + 1); 116 117 // Reserve room for potential receiver in value and is_oop 118 _value++; _is_oop++; 119 120 _max_size = max_size; 121 _size = 0; 122 _start_at_zero = false; 123 JVMCI_ONLY(_alternative_target = NULL;) 124 } else { 125 initialize(); 126 } 127 } 128 129 #if INCLUDE_JVMCI 130 void set_alternative_target(nmethod* target) { 131 _alternative_target = target; 132 } 133 134 nmethod* alternative_target() { 135 return _alternative_target; 136 } 137 #endif 138 139 inline void push_oop(Handle h) { _is_oop[_size] = true; 140 JNITypes::put_obj((oop)h.raw_value(), _value, _size); } 141 142 inline void push_int(int i) { _is_oop[_size] = false; 143 JNITypes::put_int(i, _value, _size); } 144 145 inline void push_double(double d) { _is_oop[_size] = false; _is_oop[_size + 1] = false; 146 JNITypes::put_double(d, _value, _size); } 147 148 inline void push_long(jlong l) { _is_oop[_size] = false; _is_oop[_size + 1] = false; 149 JNITypes::put_long(l, _value, _size); } 150 151 inline void push_float(float f) { _is_oop[_size] = false; 152 JNITypes::put_float(f, _value, _size); } 153 154 // receiver 155 Handle receiver() { 156 assert(_size > 0, "must at least be one argument"); 157 assert(_is_oop[0], "first argument must be an oop"); 158 assert(_value[0] != 0, "receiver must be not-null"); 159 return Handle((oop*)_value[0], false); 160 } 161 162 void set_receiver(Handle h) { 163 assert(_start_at_zero == false, "can only be called once"); 164 _start_at_zero = true; 165 _is_oop--; 166 _value--; 167 _size++; 168 _is_oop[0] = true; 169 _value[0] = (intptr_t)h.raw_value(); 170 } 171 172 // Converts all Handles to oops, and returns a reference to parameter vector 173 intptr_t* parameters() ; 174 int size_of_parameters() const { return _size; } 175 176 // Verify that pushed arguments fits a given method 177 void verify(const methodHandle& method, BasicType return_type, Thread *thread); 178 }; 179 180 // All calls to Java have to go via JavaCalls. Sets up the stack frame 181 // and makes sure that the last_Java_frame pointers are chained correctly. 182 // 183 184 class JavaCalls: AllStatic { 185 static void call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS); 186 public: 187 // call_special 188 // ------------ 189 // The receiver must be first oop in argument list 190 static void call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); 191 192 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); // No args 193 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); 194 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); 195 196 // virtual call 197 // ------------ 198 199 // The receiver must be first oop in argument list 200 static void call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); 201 202 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS); // No args 203 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); 204 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); 205 206 // Static call 207 // ----------- 208 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); 209 210 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); 211 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); 212 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); 213 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS); 214 215 // Low-level interface 216 static void call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS); 217 }; 218 219 #endif // SHARE_VM_RUNTIME_JAVACALLS_HPP