1 /*
2 * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2010, 2015 Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "asm/assembler.inline.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "nativeInst_zero.hpp"
29 #include "oops/instanceOop.hpp"
30 #include "oops/method.hpp"
31 #include "oops/objArrayKlass.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/frame.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/javaThread.hpp"
37 #include "runtime/sharedRuntime.hpp"
38 #include "runtime/stubCodeGenerator.hpp"
39 #include "runtime/stubRoutines.hpp"
40 #include "stack_zero.inline.hpp"
41 #ifdef COMPILER2
42 #include "opto/runtime.hpp"
43 #endif
44
45 // Declaration and definition of StubGenerator (no .hpp file).
46 // For a more detailed description of the stub routine structure
47 // see the comment in stubRoutines.hpp
48
49 class StubGenerator: public StubCodeGenerator {
50 private:
51 // The call stub is used to call Java from C
52 static void call_stub(
53 JavaCallWrapper *call_wrapper,
54 intptr_t* result,
55 BasicType result_type,
56 Method* method,
57 address entry_point,
58 intptr_t* parameters,
59 int parameter_words,
60 TRAPS) {
61 JavaThread *thread = THREAD;
62 ZeroStack *stack = thread->zero_stack();
63
64 // Make sure we have no pending exceptions
65 assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");
66
67 // Set up the stack if necessary
68 bool stack_needs_teardown = false;
69 if (stack->needs_setup()) {
70 size_t zero_stack_size = stack->suggest_size(thread);
71 stack->setup(alloca(zero_stack_size), zero_stack_size);
72 stack_needs_teardown = true;
73 }
74
75 // Allocate and initialize our frame
76 EntryFrame *frame =
77 EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);
78
79 if (!HAS_PENDING_EXCEPTION) {
80 // Push the frame
81 thread->push_zero_frame(frame);
82
83 // Make the call
84 Interpreter::invoke_method(method, entry_point, THREAD);
85
86 // Store the result
87 if (!HAS_PENDING_EXCEPTION) {
88 switch (result_type) {
89 case T_INT:
90 *(jint *) result = *(jint *) stack->sp();
91 break;
92 case T_LONG:
93 *(jlong *) result = *(jlong *) stack->sp();
94 break;
95 case T_FLOAT:
96 *(jfloat *) result = *(jfloat *) stack->sp();
97 break;
98 case T_DOUBLE:
99 *(jdouble *) result = *(jdouble *) stack->sp();
100 break;
101 case T_OBJECT:
102 *(oop *) result = *(oop *) stack->sp();
103 break;
104 default:
105 ShouldNotReachHere();
106 }
107 }
108
109 // Unwind the frame
110 thread->pop_zero_frame();
111 }
112
113 // Tear down the stack if necessary
114 if (stack_needs_teardown)
115 stack->teardown();
116 }
117
118 // These stubs get called from some dumb test routine.
119 // I'll write them properly when they're called from
120 // something that's actually doing something.
121 static void fake_arraycopy_stub(address src, address dst, int count) {
122 assert(count == 0, "huh?");
123 }
124
125 void generate_arraycopy_stubs() {
126 // Call the conjoint generation methods immediately after
127 // the disjoint ones so that short branches from the former
128 // to the latter can be generated.
129 StubRoutines::_jbyte_disjoint_arraycopy = (address) fake_arraycopy_stub;
130 StubRoutines::_jbyte_arraycopy = (address) fake_arraycopy_stub;
131
132 StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;
133 StubRoutines::_jshort_arraycopy = (address) fake_arraycopy_stub;
134
135 StubRoutines::_jint_disjoint_arraycopy = (address) fake_arraycopy_stub;
136 StubRoutines::_jint_arraycopy = (address) fake_arraycopy_stub;
137
138 StubRoutines::_jlong_disjoint_arraycopy = (address) fake_arraycopy_stub;
139 StubRoutines::_jlong_arraycopy = (address) fake_arraycopy_stub;
140
141 StubRoutines::_oop_disjoint_arraycopy = ShouldNotCallThisStub();
142 StubRoutines::_oop_arraycopy = ShouldNotCallThisStub();
143
144 StubRoutines::_checkcast_arraycopy = ShouldNotCallThisStub();
145 StubRoutines::_generic_arraycopy = ShouldNotCallThisStub();
146
147 // Shared code tests for "null" to discover the stub is not generated.
148 StubRoutines::_unsafe_arraycopy = nullptr;
149
150 // Shared code tests for "null" to discover the stub is not generated.
151 StubRoutines::_unsafe_setmemory = nullptr;
152
153 // We don't generate specialized code for HeapWord-aligned source
154 // arrays, so just use the code we've already generated
155 StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
156 StubRoutines::_jbyte_disjoint_arraycopy;
157 StubRoutines::_arrayof_jbyte_arraycopy =
158 StubRoutines::_jbyte_arraycopy;
159
160 StubRoutines::_arrayof_jshort_disjoint_arraycopy =
161 StubRoutines::_jshort_disjoint_arraycopy;
162 StubRoutines::_arrayof_jshort_arraycopy =
163 StubRoutines::_jshort_arraycopy;
164
165 StubRoutines::_arrayof_jint_disjoint_arraycopy =
166 StubRoutines::_jint_disjoint_arraycopy;
167 StubRoutines::_arrayof_jint_arraycopy =
168 StubRoutines::_jint_arraycopy;
169
170 StubRoutines::_arrayof_jlong_disjoint_arraycopy =
171 StubRoutines::_jlong_disjoint_arraycopy;
172 StubRoutines::_arrayof_jlong_arraycopy =
173 StubRoutines::_jlong_arraycopy;
174
175 StubRoutines::_arrayof_oop_disjoint_arraycopy =
176 StubRoutines::_oop_disjoint_arraycopy;
177 StubRoutines::_arrayof_oop_arraycopy =
178 StubRoutines::_oop_arraycopy;
179 }
180
181 void generate_initial_stubs() {
182 // entry points that exist in all platforms Note: This is code
183 // that could be shared among different platforms - however the
184 // benefit seems to be smaller than the disadvantage of having a
185 // much more complicated generator structure. See also comment in
186 // stubRoutines.hpp.
187
188 StubRoutines::_forward_exception_entry = ShouldNotCallThisStub();
189 StubRoutines::_call_stub_entry = (address) call_stub;
190 StubRoutines::_catch_exception_entry = ShouldNotCallThisStub();
191
192 // atomic calls
193 StubRoutines::_atomic_xchg_entry = ShouldNotCallThisStub();
194 StubRoutines::_atomic_cmpxchg_entry = ShouldNotCallThisStub();
195 StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();
196 StubRoutines::_atomic_add_entry = ShouldNotCallThisStub();
197 StubRoutines::_fence_entry = ShouldNotCallThisStub();
198 }
199
200 void generate_continuation_stubs() {
201 // do nothing
202 }
203
204 void generate_compiler_stubs() {
205 // do nothing
206 }
207
208 void generate_final_stubs() {
209 // arraycopy stubs used by compilers
210 generate_arraycopy_stubs();
211
212 }
213
214 public:
215 StubGenerator(CodeBuffer* code, StubGenBlobId blob_id) : StubCodeGenerator(code, blob_id) {
216 switch(blob_id) {
217 case initial_id:
218 generate_initial_stubs();
219 break;
220 case continuation_id:
221 generate_continuation_stubs();
222 break;
223 case compiler_id:
224 // do nothing
225 break;
226 case final_id:
227 generate_final_stubs();
228 break;
229 default:
230 fatal("unexpected blob id: %d", blob_id);
231 break;
232 };
233 }
234 };
235
236 void StubGenerator_generate(CodeBuffer* code, StubGenBlobId blob_id) {
237 StubGenerator g(code, blob_id);
238 }
239
240 EntryFrame *EntryFrame::build(const intptr_t* parameters,
241 int parameter_words,
242 JavaCallWrapper* call_wrapper,
243 TRAPS) {
244
245 ZeroStack *stack = THREAD->zero_stack();
246 stack->overflow_check(header_words + parameter_words, CHECK_NULL);
247
248 stack->push(0); // next_frame, filled in later
249 intptr_t *fp = stack->sp();
250 assert(fp - stack->sp() == next_frame_off, "should be");
251
252 stack->push(ENTRY_FRAME);
253 assert(fp - stack->sp() == frame_type_off, "should be");
254
255 stack->push((intptr_t) call_wrapper);
256 assert(fp - stack->sp() == call_wrapper_off, "should be");
257
258 for (int i = 0; i < parameter_words; i++)
259 stack->push(parameters[i]);
260
261 return (EntryFrame *) fp;
262 }