stubGenerator_zero.cpp revision 1010:354d3184f6b2 
1/*
2 * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
3 * Copyright 2007, 2008 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 */
25
26#include "incls/_precompiled.incl"
27#include "incls/_stubGenerator_zero.cpp.incl"
28
29// Declaration and definition of StubGenerator (no .hpp file).
30// For a more detailed description of the stub routine structure
31// see the comment in stubRoutines.hpp
32
33class StubGenerator: public StubCodeGenerator {
34 private:
35  // The call stub is used to call Java from C
36  static void call_stub(
37    JavaCallWrapper *call_wrapper,
38    intptr_t*        result,
39    BasicType        result_type,
40    methodOop        method,
41    address          entry_point,
42    intptr_t*        parameters,
43    int              parameter_words,
44    TRAPS) {
45    JavaThread *thread = (JavaThread *) THREAD;
46    ZeroStack *stack = thread->zero_stack();
47
48    // Make sure we have no pending exceptions
49    assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");
50
51    // Set up the stack if necessary
52    bool stack_needs_teardown = false;
53    if (stack->needs_setup()) {
54      size_t stack_used = thread->stack_base() - (address) &stack_used;
55      size_t stack_free = thread->stack_size() - stack_used;
56      size_t zero_stack_size = align_size_down(stack_free / 2, wordSize);
57
58      stack->setup(alloca(zero_stack_size), zero_stack_size);
59      stack_needs_teardown = true;
60    }
61
62    // Allocate and initialize our frame
63    thread->push_zero_frame(
64      EntryFrame::build(stack, parameters, parameter_words, call_wrapper));
65
66    // Make the call
67    Interpreter::invoke_method(method, entry_point, THREAD);
68
69    // Store result depending on type
70    if (!HAS_PENDING_EXCEPTION) {
71      switch (result_type) {
72      case T_INT:
73        *(jint *) result = *(jint *) stack->sp();
74        break;
75      case T_LONG:
76        *(jlong *) result = *(jlong *) stack->sp();
77        break;
78      case T_FLOAT:
79        *(jfloat *) result = *(jfloat *) stack->sp();
80        break;
81      case T_DOUBLE:
82        *(jdouble *) result = *(jdouble *) stack->sp();
83        break;
84      case T_OBJECT:
85        *(oop *) result = *(oop *) stack->sp();
86        break;
87      default:
88        ShouldNotReachHere();
89      }
90    }
91
92    // Unwind our frame
93    thread->pop_zero_frame();
94
95    // Tear down the stack if necessary
96    if (stack_needs_teardown)
97      stack->teardown();
98  }
99
100  // These stubs get called from some dumb test routine.
101  // I'll write them properly when they're called from
102  // something that's actually doing something.
103  static void fake_arraycopy_stub(address src, address dst, int count) {
104    assert(count == 0, "huh?");
105  }
106
107  void generate_arraycopy_stubs() {
108    // Call the conjoint generation methods immediately after
109    // the disjoint ones so that short branches from the former
110    // to the latter can be generated.
111    StubRoutines::_jbyte_disjoint_arraycopy  = (address) fake_arraycopy_stub;
112    StubRoutines::_jbyte_arraycopy           = (address) fake_arraycopy_stub;
113
114    StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;
115    StubRoutines::_jshort_arraycopy          = (address) fake_arraycopy_stub;
116
117    StubRoutines::_jint_disjoint_arraycopy   = (address) fake_arraycopy_stub;
118    StubRoutines::_jint_arraycopy            = (address) fake_arraycopy_stub;
119
120    StubRoutines::_jlong_disjoint_arraycopy  = (address) fake_arraycopy_stub;
121    StubRoutines::_jlong_arraycopy           = (address) fake_arraycopy_stub;
122
123    StubRoutines::_oop_disjoint_arraycopy    = ShouldNotCallThisStub();
124    StubRoutines::_oop_arraycopy             = ShouldNotCallThisStub();
125
126    StubRoutines::_checkcast_arraycopy       = ShouldNotCallThisStub();
127    StubRoutines::_unsafe_arraycopy          = ShouldNotCallThisStub();
128    StubRoutines::_generic_arraycopy         = ShouldNotCallThisStub();
129
130    // We don't generate specialized code for HeapWord-aligned source
131    // arrays, so just use the code we've already generated
132    StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
133      StubRoutines::_jbyte_disjoint_arraycopy;
134    StubRoutines::_arrayof_jbyte_arraycopy =
135      StubRoutines::_jbyte_arraycopy;
136
137    StubRoutines::_arrayof_jshort_disjoint_arraycopy =
138      StubRoutines::_jshort_disjoint_arraycopy;
139    StubRoutines::_arrayof_jshort_arraycopy =
140      StubRoutines::_jshort_arraycopy;
141
142    StubRoutines::_arrayof_jint_disjoint_arraycopy =
143      StubRoutines::_jint_disjoint_arraycopy;
144    StubRoutines::_arrayof_jint_arraycopy =
145      StubRoutines::_jint_arraycopy;
146
147    StubRoutines::_arrayof_jlong_disjoint_arraycopy =
148      StubRoutines::_jlong_disjoint_arraycopy;
149    StubRoutines::_arrayof_jlong_arraycopy =
150      StubRoutines::_jlong_arraycopy;
151
152    StubRoutines::_arrayof_oop_disjoint_arraycopy =
153      StubRoutines::_oop_disjoint_arraycopy;
154    StubRoutines::_arrayof_oop_arraycopy =
155      StubRoutines::_oop_arraycopy;
156  }
157
158  void generate_initial() {
159    // Generates all stubs and initializes the entry points
160
161    // entry points that exist in all platforms Note: This is code
162    // that could be shared among different platforms - however the
163    // benefit seems to be smaller than the disadvantage of having a
164    // much more complicated generator structure. See also comment in
165    // stubRoutines.hpp.
166
167    StubRoutines::_forward_exception_entry   = ShouldNotCallThisStub();
168    StubRoutines::_call_stub_entry           = (address) call_stub;
169    StubRoutines::_catch_exception_entry     = ShouldNotCallThisStub();
170
171    // atomic calls
172    StubRoutines::_atomic_xchg_entry         = ShouldNotCallThisStub();
173    StubRoutines::_atomic_xchg_ptr_entry     = ShouldNotCallThisStub();
174    StubRoutines::_atomic_cmpxchg_entry      = ShouldNotCallThisStub();
175    StubRoutines::_atomic_cmpxchg_ptr_entry  = ShouldNotCallThisStub();
176    StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();
177    StubRoutines::_atomic_add_entry          = ShouldNotCallThisStub();
178    StubRoutines::_atomic_add_ptr_entry      = ShouldNotCallThisStub();
179    StubRoutines::_fence_entry               = ShouldNotCallThisStub();
180
181    // amd64 does this here, sparc does it in generate_all()
182    StubRoutines::_handler_for_unsafe_access_entry =
183      ShouldNotCallThisStub();
184  }
185
186  void generate_all() {
187    // Generates all stubs and initializes the entry points
188
189    // These entry points require SharedInfo::stack0 to be set up in
190    // non-core builds and need to be relocatable, so they each
191    // fabricate a RuntimeStub internally.
192    StubRoutines::_throw_AbstractMethodError_entry =
193      ShouldNotCallThisStub();
194
195    StubRoutines::_throw_ArithmeticException_entry =
196      ShouldNotCallThisStub();
197
198    StubRoutines::_throw_NullPointerException_entry =
199      ShouldNotCallThisStub();
200
201    StubRoutines::_throw_NullPointerException_at_call_entry =
202      ShouldNotCallThisStub();
203
204    StubRoutines::_throw_StackOverflowError_entry =
205      ShouldNotCallThisStub();
206
207    // support for verify_oop (must happen after universe_init)
208    StubRoutines::_verify_oop_subroutine_entry =
209      ShouldNotCallThisStub();
210
211    // arraycopy stubs used by compilers
212    generate_arraycopy_stubs();
213  }
214
215 public:
216  StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
217    if (all) {
218      generate_all();
219    } else {
220      generate_initial();
221    }
222  }
223};
224
225void StubGenerator_generate(CodeBuffer* code, bool all) {
226  StubGenerator g(code, all);
227}
228
229EntryFrame *EntryFrame::build(ZeroStack*       stack,
230                              const intptr_t*  parameters,
231                              int              parameter_words,
232                              JavaCallWrapper* call_wrapper) {
233  if (header_words + parameter_words > stack->available_words()) {
234    Unimplemented();
235  }
236
237  stack->push(0); // next_frame, filled in later
238  intptr_t *fp = stack->sp();
239  assert(fp - stack->sp() == next_frame_off, "should be");
240
241  stack->push(ENTRY_FRAME);
242  assert(fp - stack->sp() == frame_type_off, "should be");
243
244  stack->push((intptr_t) call_wrapper);
245  assert(fp - stack->sp() == call_wrapper_off, "should be");
246
247  for (int i = 0; i < parameter_words; i++)
248    stack->push(parameters[i]);
249
250  return (EntryFrame *) fp;
251}
252