Wed, 14 Oct 2020 17:44:48 +0800
Merge
1 /*
2 * Copyright (c) 1997, 2017, 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 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_RUNTIME_JAVACALLS_HPP
32 #define SHARE_VM_RUNTIME_JAVACALLS_HPP
34 #include "memory/allocation.hpp"
35 #include "oops/method.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/javaFrameAnchor.hpp"
38 #include "runtime/thread.inline.hpp"
39 #include "runtime/vmThread.hpp"
40 #ifdef TARGET_ARCH_x86
41 # include "jniTypes_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "jniTypes_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "jniTypes_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "jniTypes_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "jniTypes_ppc.hpp"
54 #endif
55 #ifdef TARGET_ARCH_mips
56 # include "jniTypes_mips.hpp"
57 #endif
59 // A JavaCallWrapper is constructed before each JavaCall and destructed after the call.
60 // Its purpose is to allocate/deallocate a new handle block and to save/restore the last
61 // Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack.
63 class JavaCallWrapper: StackObj {
64 friend class VMStructs;
65 private:
66 JavaThread* _thread; // the thread to which this call belongs
67 JNIHandleBlock* _handles; // the saved handle block
68 Method* _callee_method; // to be able to collect arguments if entry frame is top frame
69 oop _receiver; // the receiver of the call (if a non-static call)
71 JavaFrameAnchor _anchor; // last thread anchor state that we must restore
73 JavaValue* _result; // result value
75 public:
76 // Construction/destruction
77 JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS);
78 ~JavaCallWrapper();
80 // Accessors
81 JavaThread* thread() const { return _thread; }
82 JNIHandleBlock* handles() const { return _handles; }
84 JavaFrameAnchor* anchor(void) { return &_anchor; }
86 JavaValue* result() const { return _result; }
87 // GC support
88 Method* callee_method() { return _callee_method; }
89 oop receiver() { return _receiver; }
90 void oops_do(OopClosure* f);
92 bool is_first_frame() const { return _anchor.last_Java_sp() == NULL; }
94 };
97 // Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args)
98 class JavaCallArguments : public StackObj {
99 private:
100 enum Constants {
101 _default_size = 8 // Must be at least # of arguments in JavaCalls methods
102 };
104 intptr_t _value_buffer [_default_size + 1];
105 u_char _value_state_buffer[_default_size + 1];
107 intptr_t* _value;
108 u_char* _value_state;
109 int _size;
110 int _max_size;
111 bool _start_at_zero; // Support late setting of receiver
113 void initialize() {
114 // Starts at first element to support set_receiver.
115 _value = &_value_buffer[1];
116 _value_state = &_value_state_buffer[1];
118 _max_size = _default_size;
119 _size = 0;
120 _start_at_zero = false;
121 }
123 // Helper for push_oop and the like. The value argument is a
124 // "handle" that refers to an oop. We record the address of the
125 // handle rather than the designated oop. The handle is later
126 // resolved to the oop by parameters(). This delays the exposure of
127 // naked oops until it is GC-safe.
128 template<typename T>
129 inline int push_oop_impl(T handle, int size) {
130 // JNITypes::put_obj expects an oop value, so we play fast and
131 // loose with the type system. The cast from handle type to oop
132 // *must* use a C-style cast. In a product build it performs a
133 // reinterpret_cast. In a debug build (more accurately, in a
134 // CHECK_UNHANDLED_OOPS build) it performs a static_cast, invoking
135 // the debug-only oop class's conversion from void* constructor.
136 JNITypes::put_obj((oop)handle, _value, size); // Updates size.
137 return size; // Return the updated size.
138 }
140 public:
141 JavaCallArguments() { initialize(); }
143 JavaCallArguments(Handle receiver) {
144 initialize();
145 push_oop(receiver);
146 }
148 JavaCallArguments(int max_size) {
149 if (max_size > _default_size) {
150 _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1);
151 _value_state = NEW_RESOURCE_ARRAY(u_char, max_size + 1);
153 // Reserve room for potential receiver in value and state
154 _value++;
155 _value_state++;
157 _max_size = max_size;
158 _size = 0;
159 _start_at_zero = false;
160 } else {
161 initialize();
162 }
163 }
165 // The possible values for _value_state elements.
166 enum {
167 value_state_primitive,
168 value_state_oop,
169 value_state_handle,
170 value_state_jobject,
171 value_state_limit
172 };
174 inline void push_oop(Handle h) {
175 _value_state[_size] = value_state_handle;
176 _size = push_oop_impl(h.raw_value(), _size);
177 }
179 inline void push_jobject(jobject h) {
180 _value_state[_size] = value_state_jobject;
181 _size = push_oop_impl(h, _size);
182 }
184 inline void push_int(int i) {
185 _value_state[_size] = value_state_primitive;
186 JNITypes::put_int(i, _value, _size);
187 }
189 inline void push_double(double d) {
190 _value_state[_size] = value_state_primitive;
191 _value_state[_size + 1] = value_state_primitive;
192 JNITypes::put_double(d, _value, _size);
193 }
195 inline void push_long(jlong l) {
196 _value_state[_size] = value_state_primitive;
197 _value_state[_size + 1] = value_state_primitive;
198 JNITypes::put_long(l, _value, _size);
199 }
201 inline void push_float(float f) {
202 _value_state[_size] = value_state_primitive;
203 JNITypes::put_float(f, _value, _size);
204 }
206 // receiver
207 Handle receiver() {
208 assert(_size > 0, "must at least be one argument");
209 assert(_value_state[0] == value_state_handle,
210 "first argument must be an oop");
211 assert(_value[0] != 0, "receiver must be not-null");
212 return Handle((oop*)_value[0], false);
213 }
215 void set_receiver(Handle h) {
216 assert(_start_at_zero == false, "can only be called once");
217 _start_at_zero = true;
218 _value_state--;
219 _value--;
220 _size++;
221 _value_state[0] = value_state_handle;
222 push_oop_impl(h.raw_value(), 0);
223 }
225 // Converts all Handles to oops, and returns a reference to parameter vector
226 intptr_t* parameters() ;
227 int size_of_parameters() const { return _size; }
229 // Verify that pushed arguments fits a given method
230 void verify(methodHandle method, BasicType return_type);
231 };
233 // All calls to Java have to go via JavaCalls. Sets up the stack frame
234 // and makes sure that the last_Java_frame pointers are chained correctly.
235 //
237 class JavaCalls: AllStatic {
238 static void call_helper(JavaValue* result, methodHandle* method, JavaCallArguments* args, TRAPS);
239 public:
240 // Optimized Constuctor call
241 static void call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS);
243 // call_special
244 // ------------
245 // The receiver must be first oop in argument list
246 static void call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS);
248 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); // No args
249 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS);
250 static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS);
252 // virtual call
253 // ------------
255 // The receiver must be first oop in argument list
256 static void call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS);
258 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS); // No args
259 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS);
260 static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS);
262 // Static call
263 // -----------
264 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS);
266 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
267 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS);
268 static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS);
270 // Low-level interface
271 static void call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS);
272 };
274 #endif // SHARE_VM_RUNTIME_JAVACALLS_HPP