javaCalls.hpp revision 9248:6ab7e19c9220
1/* 2 * Copyright (c) 1997, 2015, 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.inline.hpp" 33#include "runtime/vmThread.hpp" 34#ifdef TARGET_ARCH_x86 35# include "jniTypes_x86.hpp" 36#endif 37#ifdef TARGET_ARCH_sparc 38# include "jniTypes_sparc.hpp" 39#endif 40#ifdef TARGET_ARCH_zero 41# include "jniTypes_zero.hpp" 42#endif 43#ifdef TARGET_ARCH_arm 44# include "jniTypes_arm.hpp" 45#endif 46#ifdef TARGET_ARCH_ppc 47# include "jniTypes_ppc.hpp" 48#endif 49#ifdef TARGET_ARCH_aarch64 50# include "jniTypes_aarch64.hpp" 51#endif 52 53// A JavaCallWrapper is constructed before each JavaCall and destructed after the call. 54// Its purpose is to allocate/deallocate a new handle block and to save/restore the last 55// Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack. 56 57class JavaCallWrapper: StackObj { 58 friend class VMStructs; 59 private: 60 JavaThread* _thread; // the thread to which this call belongs 61 JNIHandleBlock* _handles; // the saved handle block 62 Method* _callee_method; // to be able to collect arguments if entry frame is top frame 63 oop _receiver; // the receiver of the call (if a non-static call) 64 65 JavaFrameAnchor _anchor; // last thread anchor state that we must restore 66 67 JavaValue* _result; // result value 68 69 public: 70 // Construction/destruction 71 JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS); 72 ~JavaCallWrapper(); 73 74 // Accessors 75 JavaThread* thread() const { return _thread; } 76 JNIHandleBlock* handles() const { return _handles; } 77 78 JavaFrameAnchor* anchor(void) { return &_anchor; } 79 80 JavaValue* result() const { return _result; } 81 // GC support 82 Method* callee_method() { return _callee_method; } 83 oop receiver() { return _receiver; } 84 void oops_do(OopClosure* f); 85 86 bool is_first_frame() const { return _anchor.last_Java_sp() == NULL; } 87 88}; 89 90 91// Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args) 92class JavaCallArguments : public StackObj { 93 private: 94 enum Constants { 95 _default_size = 8 // Must be at least # of arguments in JavaCalls methods 96 }; 97 98 intptr_t _value_buffer [_default_size + 1]; 99 bool _is_oop_buffer[_default_size + 1]; 100 101 intptr_t* _value; 102 bool* _is_oop; 103 int _size; 104 int _max_size; 105 bool _start_at_zero; // Support late setting of receiver 106 JVMCI_ONLY(nmethod* _alternative_target;) // Nmethod that should be called instead of normal target 107 108 void initialize() { 109 // Starts at first element to support set_receiver. 110 _value = &_value_buffer[1]; 111 _is_oop = &_is_oop_buffer[1]; 112 113 _max_size = _default_size; 114 _size = 0; 115 _start_at_zero = false; 116 JVMCI_ONLY(_alternative_target = NULL;) 117 } 118 119 public: 120 JavaCallArguments() { initialize(); } 121 122 JavaCallArguments(Handle receiver) { 123 initialize(); 124 push_oop(receiver); 125 } 126 127 JavaCallArguments(int max_size) { 128 if (max_size > _default_size) { 129 _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1); 130 _is_oop = NEW_RESOURCE_ARRAY(bool, max_size + 1); 131 132 // Reserve room for potential receiver in value and is_oop 133 _value++; _is_oop++; 134 135 _max_size = max_size; 136 _size = 0; 137 _start_at_zero = false; 138 JVMCI_ONLY(_alternative_target = NULL;) 139 } else { 140 initialize(); 141 } 142 } 143 144#if INCLUDE_JVMCI 145 void set_alternative_target(nmethod* target) { 146 _alternative_target = target; 147 } 148 149 nmethod* alternative_target() { 150 return _alternative_target; 151 } 152#endif 153 154 inline void push_oop(Handle h) { _is_oop[_size] = true; 155 JNITypes::put_obj((oop)h.raw_value(), _value, _size); } 156 157 inline void push_int(int i) { _is_oop[_size] = false; 158 JNITypes::put_int(i, _value, _size); } 159 160 inline void push_double(double d) { _is_oop[_size] = false; _is_oop[_size + 1] = false; 161 JNITypes::put_double(d, _value, _size); } 162 163 inline void push_long(jlong l) { _is_oop[_size] = false; _is_oop[_size + 1] = false; 164 JNITypes::put_long(l, _value, _size); } 165 166 inline void push_float(float f) { _is_oop[_size] = false; 167 JNITypes::put_float(f, _value, _size); } 168 169 // receiver 170 Handle receiver() { 171 assert(_size > 0, "must at least be one argument"); 172 assert(_is_oop[0], "first argument must be an oop"); 173 assert(_value[0] != 0, "receiver must be not-null"); 174 return Handle((oop*)_value[0], false); 175 } 176 177 void set_receiver(Handle h) { 178 assert(_start_at_zero == false, "can only be called once"); 179 _start_at_zero = true; 180 _is_oop--; 181 _value--; 182 _size++; 183 _is_oop[0] = true; 184 _value[0] = (intptr_t)h.raw_value(); 185 } 186 187 // Converts all Handles to oops, and returns a reference to parameter vector 188 intptr_t* parameters() ; 189 int size_of_parameters() const { return _size; } 190 191 // Verify that pushed arguments fits a given method 192 void verify(const methodHandle& method, BasicType return_type, Thread *thread); 193}; 194 195// All calls to Java have to go via JavaCalls. Sets up the stack frame 196// and makes sure that the last_Java_frame pointers are chained correctly. 197// 198 199class JavaCalls: AllStatic { 200 static void call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS); 201 public: 202 // call_special 203 // ------------ 204 // The receiver must be first oop in argument list 205 static void call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); 206 207 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); // No args 208 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); 209 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); 210 211 // virtual call 212 // ------------ 213 214 // The receiver must be first oop in argument list 215 static void call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); 216 217 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS); // No args 218 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); 219 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); 220 221 // Static call 222 // ----------- 223 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); 224 225 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); 226 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); 227 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); 228 229 // Low-level interface 230 static void call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS); 231}; 232 233#endif // SHARE_VM_RUNTIME_JAVACALLS_HPP 234