stubGenerator_zero.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2003, 2007, 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 "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 zero_stack_size = stack->suggest_size(thread);
55      stack->setup(alloca(zero_stack_size), zero_stack_size);
56      stack_needs_teardown = true;
57    }
58
59    // Allocate and initialize our frame
60    EntryFrame *frame =
61      EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);
62
63    if (!HAS_PENDING_EXCEPTION) {
64      // Push the frame
65      thread->push_zero_frame(frame);
66
67      // Make the call
68      Interpreter::invoke_method(method, entry_point, THREAD);
69
70      // Store the result
71      if (!HAS_PENDING_EXCEPTION) {
72        switch (result_type) {
73        case T_INT:
74          *(jint *) result = *(jint *) stack->sp();
75          break;
76        case T_LONG:
77          *(jlong *) result = *(jlong *) stack->sp();
78          break;
79        case T_FLOAT:
80          *(jfloat *) result = *(jfloat *) stack->sp();
81          break;
82        case T_DOUBLE:
83          *(jdouble *) result = *(jdouble *) stack->sp();
84          break;
85        case T_OBJECT:
86          *(oop *) result = *(oop *) stack->sp();
87          break;
88        default:
89          ShouldNotReachHere();
90        }
91      }
92
93      // Unwind the frame
94      thread->pop_zero_frame();
95    }
96
97    // Tear down the stack if necessary
98    if (stack_needs_teardown)
99      stack->teardown();
100  }
101
102  // These stubs get called from some dumb test routine.
103  // I'll write them properly when they're called from
104  // something that's actually doing something.
105  static void fake_arraycopy_stub(address src, address dst, int count) {
106    assert(count == 0, "huh?");
107  }
108
109  void generate_arraycopy_stubs() {
110    // Call the conjoint generation methods immediately after
111    // the disjoint ones so that short branches from the former
112    // to the latter can be generated.
113    StubRoutines::_jbyte_disjoint_arraycopy  = (address) fake_arraycopy_stub;
114    StubRoutines::_jbyte_arraycopy           = (address) fake_arraycopy_stub;
115
116    StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;
117    StubRoutines::_jshort_arraycopy          = (address) fake_arraycopy_stub;
118
119    StubRoutines::_jint_disjoint_arraycopy   = (address) fake_arraycopy_stub;
120    StubRoutines::_jint_arraycopy            = (address) fake_arraycopy_stub;
121
122    StubRoutines::_jlong_disjoint_arraycopy  = (address) fake_arraycopy_stub;
123    StubRoutines::_jlong_arraycopy           = (address) fake_arraycopy_stub;
124
125    StubRoutines::_oop_disjoint_arraycopy    = ShouldNotCallThisStub();
126    StubRoutines::_oop_arraycopy             = ShouldNotCallThisStub();
127
128    StubRoutines::_checkcast_arraycopy       = ShouldNotCallThisStub();
129    StubRoutines::_unsafe_arraycopy          = ShouldNotCallThisStub();
130    StubRoutines::_generic_arraycopy         = ShouldNotCallThisStub();
131
132    // We don't generate specialized code for HeapWord-aligned source
133    // arrays, so just use the code we've already generated
134    StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
135      StubRoutines::_jbyte_disjoint_arraycopy;
136    StubRoutines::_arrayof_jbyte_arraycopy =
137      StubRoutines::_jbyte_arraycopy;
138
139    StubRoutines::_arrayof_jshort_disjoint_arraycopy =
140      StubRoutines::_jshort_disjoint_arraycopy;
141    StubRoutines::_arrayof_jshort_arraycopy =
142      StubRoutines::_jshort_arraycopy;
143
144    StubRoutines::_arrayof_jint_disjoint_arraycopy =
145      StubRoutines::_jint_disjoint_arraycopy;
146    StubRoutines::_arrayof_jint_arraycopy =
147      StubRoutines::_jint_arraycopy;
148
149    StubRoutines::_arrayof_jlong_disjoint_arraycopy =
150      StubRoutines::_jlong_disjoint_arraycopy;
151    StubRoutines::_arrayof_jlong_arraycopy =
152      StubRoutines::_jlong_arraycopy;
153
154    StubRoutines::_arrayof_oop_disjoint_arraycopy =
155      StubRoutines::_oop_disjoint_arraycopy;
156    StubRoutines::_arrayof_oop_arraycopy =
157      StubRoutines::_oop_arraycopy;
158  }
159
160  void generate_initial() {
161    // Generates all stubs and initializes the entry points
162
163    // entry points that exist in all platforms Note: This is code
164    // that could be shared among different platforms - however the
165    // benefit seems to be smaller than the disadvantage of having a
166    // much more complicated generator structure. See also comment in
167    // stubRoutines.hpp.
168
169    StubRoutines::_forward_exception_entry   = ShouldNotCallThisStub();
170    StubRoutines::_call_stub_entry           = (address) call_stub;
171    StubRoutines::_catch_exception_entry     = ShouldNotCallThisStub();
172
173    // atomic calls
174    StubRoutines::_atomic_xchg_entry         = ShouldNotCallThisStub();
175    StubRoutines::_atomic_xchg_ptr_entry     = ShouldNotCallThisStub();
176    StubRoutines::_atomic_cmpxchg_entry      = ShouldNotCallThisStub();
177    StubRoutines::_atomic_cmpxchg_ptr_entry  = ShouldNotCallThisStub();
178    StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();
179    StubRoutines::_atomic_add_entry          = ShouldNotCallThisStub();
180    StubRoutines::_atomic_add_ptr_entry      = ShouldNotCallThisStub();
181    StubRoutines::_fence_entry               = ShouldNotCallThisStub();
182
183    // amd64 does this here, sparc does it in generate_all()
184    StubRoutines::_handler_for_unsafe_access_entry =
185      ShouldNotCallThisStub();
186  }
187
188  void generate_all() {
189    // Generates all stubs and initializes the entry points
190
191    // These entry points require SharedInfo::stack0 to be set up in
192    // non-core builds and need to be relocatable, so they each
193    // fabricate a RuntimeStub internally.
194    StubRoutines::_throw_AbstractMethodError_entry =
195      ShouldNotCallThisStub();
196
197    StubRoutines::_throw_ArithmeticException_entry =
198      ShouldNotCallThisStub();
199
200    StubRoutines::_throw_NullPointerException_entry =
201      ShouldNotCallThisStub();
202
203    StubRoutines::_throw_NullPointerException_at_call_entry =
204      ShouldNotCallThisStub();
205
206    StubRoutines::_throw_StackOverflowError_entry =
207      ShouldNotCallThisStub();
208
209    // support for verify_oop (must happen after universe_init)
210    StubRoutines::_verify_oop_subroutine_entry =
211      ShouldNotCallThisStub();
212
213    // arraycopy stubs used by compilers
214    generate_arraycopy_stubs();
215  }
216
217 public:
218  StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
219    if (all) {
220      generate_all();
221    } else {
222      generate_initial();
223    }
224  }
225};
226
227void StubGenerator_generate(CodeBuffer* code, bool all) {
228  StubGenerator g(code, all);
229}
230
231EntryFrame *EntryFrame::build(const intptr_t*  parameters,
232                              int              parameter_words,
233                              JavaCallWrapper* call_wrapper,
234                              TRAPS) {
235
236  ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();
237  stack->overflow_check(header_words + parameter_words, CHECK_NULL);
238
239  stack->push(0); // next_frame, filled in later
240  intptr_t *fp = stack->sp();
241  assert(fp - stack->sp() == next_frame_off, "should be");
242
243  stack->push(ENTRY_FRAME);
244  assert(fp - stack->sp() == frame_type_off, "should be");
245
246  stack->push((intptr_t) call_wrapper);
247  assert(fp - stack->sp() == call_wrapper_off, "should be");
248
249  for (int i = 0; i < parameter_words; i++)
250    stack->push(parameters[i]);
251
252  return (EntryFrame *) fp;
253}
254