stubGenerator_zero.cpp revision 5776:de6a9e811145 
1/*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2010 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 "precompiled.hpp"
27#include "asm/assembler.hpp"
28#include "assembler_zero.inline.hpp"
29#include "interpreter/interpreter.hpp"
30#include "nativeInst_zero.hpp"
31#include "oops/instanceOop.hpp"
32#include "oops/method.hpp"
33#include "oops/objArrayKlass.hpp"
34#include "oops/oop.inline.hpp"
35#include "prims/methodHandles.hpp"
36#include "runtime/frame.inline.hpp"
37#include "runtime/handles.inline.hpp"
38#include "runtime/sharedRuntime.hpp"
39#include "runtime/stubCodeGenerator.hpp"
40#include "runtime/stubRoutines.hpp"
41#include "runtime/thread.inline.hpp"
42#include "stack_zero.inline.hpp"
43#include "utilities/top.hpp"
44#ifdef COMPILER2
45#include "opto/runtime.hpp"
46#endif
47
48// Declaration and definition of StubGenerator (no .hpp file).
49// For a more detailed description of the stub routine structure
50// see the comment in stubRoutines.hpp
51
52class StubGenerator: public StubCodeGenerator {
53 private:
54  // The call stub is used to call Java from C
55  static void call_stub(
56    JavaCallWrapper *call_wrapper,
57    intptr_t*        result,
58    BasicType        result_type,
59    Method*          method,
60    address          entry_point,
61    intptr_t*        parameters,
62    int              parameter_words,
63    TRAPS) {
64    JavaThread *thread = (JavaThread *) THREAD;
65    ZeroStack *stack = thread->zero_stack();
66
67    // Make sure we have no pending exceptions
68    assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");
69
70    // Set up the stack if necessary
71    bool stack_needs_teardown = false;
72    if (stack->needs_setup()) {
73      size_t zero_stack_size = stack->suggest_size(thread);
74      stack->setup(alloca(zero_stack_size), zero_stack_size);
75      stack_needs_teardown = true;
76    }
77
78    // Allocate and initialize our frame
79    EntryFrame *frame =
80      EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);
81
82    if (!HAS_PENDING_EXCEPTION) {
83      // Push the frame
84      thread->push_zero_frame(frame);
85
86      // Make the call
87      Interpreter::invoke_method(method, entry_point, THREAD);
88
89      // Store the result
90      if (!HAS_PENDING_EXCEPTION) {
91        switch (result_type) {
92        case T_INT:
93          *(jint *) result = *(jint *) stack->sp();
94          break;
95        case T_LONG:
96          *(jlong *) result = *(jlong *) stack->sp();
97          break;
98        case T_FLOAT:
99          *(jfloat *) result = *(jfloat *) stack->sp();
100          break;
101        case T_DOUBLE:
102          *(jdouble *) result = *(jdouble *) stack->sp();
103          break;
104        case T_OBJECT:
105          *(oop *) result = *(oop *) stack->sp();
106          break;
107        default:
108          ShouldNotReachHere();
109        }
110      }
111
112      // Unwind the frame
113      thread->pop_zero_frame();
114    }
115
116    // Tear down the stack if necessary
117    if (stack_needs_teardown)
118      stack->teardown();
119  }
120
121  // These stubs get called from some dumb test routine.
122  // I'll write them properly when they're called from
123  // something that's actually doing something.
124  static void fake_arraycopy_stub(address src, address dst, int count) {
125    assert(count == 0, "huh?");
126  }
127
128  void generate_arraycopy_stubs() {
129    // Call the conjoint generation methods immediately after
130    // the disjoint ones so that short branches from the former
131    // to the latter can be generated.
132    StubRoutines::_jbyte_disjoint_arraycopy  = (address) fake_arraycopy_stub;
133    StubRoutines::_jbyte_arraycopy           = (address) fake_arraycopy_stub;
134
135    StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;
136    StubRoutines::_jshort_arraycopy          = (address) fake_arraycopy_stub;
137
138    StubRoutines::_jint_disjoint_arraycopy   = (address) fake_arraycopy_stub;
139    StubRoutines::_jint_arraycopy            = (address) fake_arraycopy_stub;
140
141    StubRoutines::_jlong_disjoint_arraycopy  = (address) fake_arraycopy_stub;
142    StubRoutines::_jlong_arraycopy           = (address) fake_arraycopy_stub;
143
144    StubRoutines::_oop_disjoint_arraycopy    = ShouldNotCallThisStub();
145    StubRoutines::_oop_arraycopy             = ShouldNotCallThisStub();
146
147    StubRoutines::_checkcast_arraycopy       = ShouldNotCallThisStub();
148    StubRoutines::_unsafe_arraycopy          = ShouldNotCallThisStub();
149    StubRoutines::_generic_arraycopy         = ShouldNotCallThisStub();
150
151    // We don't generate specialized code for HeapWord-aligned source
152    // arrays, so just use the code we've already generated
153    StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
154      StubRoutines::_jbyte_disjoint_arraycopy;
155    StubRoutines::_arrayof_jbyte_arraycopy =
156      StubRoutines::_jbyte_arraycopy;
157
158    StubRoutines::_arrayof_jshort_disjoint_arraycopy =
159      StubRoutines::_jshort_disjoint_arraycopy;
160    StubRoutines::_arrayof_jshort_arraycopy =
161      StubRoutines::_jshort_arraycopy;
162
163    StubRoutines::_arrayof_jint_disjoint_arraycopy =
164      StubRoutines::_jint_disjoint_arraycopy;
165    StubRoutines::_arrayof_jint_arraycopy =
166      StubRoutines::_jint_arraycopy;
167
168    StubRoutines::_arrayof_jlong_disjoint_arraycopy =
169      StubRoutines::_jlong_disjoint_arraycopy;
170    StubRoutines::_arrayof_jlong_arraycopy =
171      StubRoutines::_jlong_arraycopy;
172
173    StubRoutines::_arrayof_oop_disjoint_arraycopy =
174      StubRoutines::_oop_disjoint_arraycopy;
175    StubRoutines::_arrayof_oop_arraycopy =
176      StubRoutines::_oop_arraycopy;
177  }
178
179  static int SafeFetch32(int *adr, int errValue) {
180    int value = errValue;
181    value = *adr;
182    return value;
183  }
184
185  static intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) {
186    intptr_t value = errValue;
187    value = *adr;
188    return value;
189  }
190
191
192  void generate_initial() {
193    // Generates all stubs and initializes the entry points
194
195    // entry points that exist in all platforms Note: This is code
196    // that could be shared among different platforms - however the
197    // benefit seems to be smaller than the disadvantage of having a
198    // much more complicated generator structure. See also comment in
199    // stubRoutines.hpp.
200
201    StubRoutines::_forward_exception_entry   = ShouldNotCallThisStub();
202    StubRoutines::_call_stub_entry           = (address) call_stub;
203    StubRoutines::_catch_exception_entry     = ShouldNotCallThisStub();
204
205    // atomic calls
206    StubRoutines::_atomic_xchg_entry         = ShouldNotCallThisStub();
207    StubRoutines::_atomic_xchg_ptr_entry     = ShouldNotCallThisStub();
208    StubRoutines::_atomic_cmpxchg_entry      = ShouldNotCallThisStub();
209    StubRoutines::_atomic_cmpxchg_ptr_entry  = ShouldNotCallThisStub();
210    StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();
211    StubRoutines::_atomic_add_entry          = ShouldNotCallThisStub();
212    StubRoutines::_atomic_add_ptr_entry      = ShouldNotCallThisStub();
213    StubRoutines::_fence_entry               = ShouldNotCallThisStub();
214
215    // amd64 does this here, sparc does it in generate_all()
216    StubRoutines::_handler_for_unsafe_access_entry =
217      ShouldNotCallThisStub();
218  }
219
220  void generate_all() {
221    // Generates all stubs and initializes the entry points
222
223    // These entry points require SharedInfo::stack0 to be set up in
224    // non-core builds and need to be relocatable, so they each
225    // fabricate a RuntimeStub internally.
226    StubRoutines::_throw_AbstractMethodError_entry =
227      ShouldNotCallThisStub();
228
229    StubRoutines::_throw_NullPointerException_at_call_entry =
230      ShouldNotCallThisStub();
231
232    StubRoutines::_throw_StackOverflowError_entry =
233      ShouldNotCallThisStub();
234
235    // support for verify_oop (must happen after universe_init)
236    StubRoutines::_verify_oop_subroutine_entry =
237      ShouldNotCallThisStub();
238
239    // arraycopy stubs used by compilers
240    generate_arraycopy_stubs();
241
242    // Safefetch stubs.
243    StubRoutines::_safefetch32_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetch32);
244    StubRoutines::_safefetch32_fault_pc = NULL;
245    StubRoutines::_safefetch32_continuation_pc = NULL;
246
247    StubRoutines::_safefetchN_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetchN);
248    StubRoutines::_safefetchN_fault_pc = NULL;
249    StubRoutines::_safefetchN_continuation_pc = NULL;
250  }
251
252 public:
253  StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
254    if (all) {
255      generate_all();
256    } else {
257      generate_initial();
258    }
259  }
260};
261
262void StubGenerator_generate(CodeBuffer* code, bool all) {
263  StubGenerator g(code, all);
264}
265
266EntryFrame *EntryFrame::build(const intptr_t*  parameters,
267                              int              parameter_words,
268                              JavaCallWrapper* call_wrapper,
269                              TRAPS) {
270
271  ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();
272  stack->overflow_check(header_words + parameter_words, CHECK_NULL);
273
274  stack->push(0); // next_frame, filled in later
275  intptr_t *fp = stack->sp();
276  assert(fp - stack->sp() == next_frame_off, "should be");
277
278  stack->push(ENTRY_FRAME);
279  assert(fp - stack->sp() == frame_type_off, "should be");
280
281  stack->push((intptr_t) call_wrapper);
282  assert(fp - stack->sp() == call_wrapper_off, "should be");
283
284  for (int i = 0; i < parameter_words; i++)
285    stack->push(parameters[i]);
286
287  return (EntryFrame *) fp;
288}
289