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1 /*
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2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * Copyright 2007, 2008, 2010 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 #include "incls/_precompiled.incl"
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27 #include "incls/_stubGenerator_zero.cpp.incl"
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28
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29 // Declaration and definition of StubGenerator (no .hpp file).
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30 // For a more detailed description of the stub routine structure
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31 // see the comment in stubRoutines.hpp
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32
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33 class StubGenerator: public StubCodeGenerator {
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34 private:
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35 // The call stub is used to call Java from C
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36 static void call_stub(
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37 JavaCallWrapper *call_wrapper,
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38 intptr_t* result,
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39 BasicType result_type,
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40 methodOop method,
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41 address entry_point,
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42 intptr_t* parameters,
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43 int parameter_words,
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44 TRAPS) {
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45 JavaThread *thread = (JavaThread *) THREAD;
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46 ZeroStack *stack = thread->zero_stack();
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47
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48 // Make sure we have no pending exceptions
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49 assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");
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50
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51 // Set up the stack if necessary
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52 bool stack_needs_teardown = false;
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53 if (stack->needs_setup()) {
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54 size_t stack_used = thread->stack_base() - (address) &stack_used;
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55 size_t stack_free = thread->stack_size() - stack_used;
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56 size_t zero_stack_size = align_size_down(stack_free / 2, wordSize);
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57
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58 stack->setup(alloca(zero_stack_size), zero_stack_size);
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59 stack_needs_teardown = true;
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60 }
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61
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62 // Allocate and initialize our frame
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63 EntryFrame *frame =
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64 EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);
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65
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66 if (!HAS_PENDING_EXCEPTION) {
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67 // Push the frame
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68 thread->push_zero_frame(frame);
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69
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70 // Make the call
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71 Interpreter::invoke_method(method, entry_point, THREAD);
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72
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73 // Store the result
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74 if (!HAS_PENDING_EXCEPTION) {
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75 switch (result_type) {
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76 case T_INT:
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77 *(jint *) result = *(jint *) stack->sp();
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78 break;
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79 case T_LONG:
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80 *(jlong *) result = *(jlong *) stack->sp();
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81 break;
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82 case T_FLOAT:
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83 *(jfloat *) result = *(jfloat *) stack->sp();
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84 break;
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85 case T_DOUBLE:
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86 *(jdouble *) result = *(jdouble *) stack->sp();
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87 break;
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88 case T_OBJECT:
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89 *(oop *) result = *(oop *) stack->sp();
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90 break;
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91 default:
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92 ShouldNotReachHere();
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93 }
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94 }
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95
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96 // Unwind the frame
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97 thread->pop_zero_frame();
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98 }
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99
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100 // Tear down the stack if necessary
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101 if (stack_needs_teardown)
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102 stack->teardown();
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103 }
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104
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105 // These stubs get called from some dumb test routine.
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106 // I'll write them properly when they're called from
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107 // something that's actually doing something.
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108 static void fake_arraycopy_stub(address src, address dst, int count) {
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109 assert(count == 0, "huh?");
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110 }
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111
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112 void generate_arraycopy_stubs() {
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113 // Call the conjoint generation methods immediately after
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114 // the disjoint ones so that short branches from the former
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115 // to the latter can be generated.
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116 StubRoutines::_jbyte_disjoint_arraycopy = (address) fake_arraycopy_stub;
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117 StubRoutines::_jbyte_arraycopy = (address) fake_arraycopy_stub;
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118
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119 StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;
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120 StubRoutines::_jshort_arraycopy = (address) fake_arraycopy_stub;
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121
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122 StubRoutines::_jint_disjoint_arraycopy = (address) fake_arraycopy_stub;
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123 StubRoutines::_jint_arraycopy = (address) fake_arraycopy_stub;
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124
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125 StubRoutines::_jlong_disjoint_arraycopy = (address) fake_arraycopy_stub;
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126 StubRoutines::_jlong_arraycopy = (address) fake_arraycopy_stub;
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127
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128 StubRoutines::_oop_disjoint_arraycopy = ShouldNotCallThisStub();
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129 StubRoutines::_oop_arraycopy = ShouldNotCallThisStub();
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130
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131 StubRoutines::_checkcast_arraycopy = ShouldNotCallThisStub();
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132 StubRoutines::_unsafe_arraycopy = ShouldNotCallThisStub();
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133 StubRoutines::_generic_arraycopy = ShouldNotCallThisStub();
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134
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135 // We don't generate specialized code for HeapWord-aligned source
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136 // arrays, so just use the code we've already generated
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137 StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
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138 StubRoutines::_jbyte_disjoint_arraycopy;
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139 StubRoutines::_arrayof_jbyte_arraycopy =
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140 StubRoutines::_jbyte_arraycopy;
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141
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142 StubRoutines::_arrayof_jshort_disjoint_arraycopy =
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143 StubRoutines::_jshort_disjoint_arraycopy;
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144 StubRoutines::_arrayof_jshort_arraycopy =
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145 StubRoutines::_jshort_arraycopy;
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146
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147 StubRoutines::_arrayof_jint_disjoint_arraycopy =
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148 StubRoutines::_jint_disjoint_arraycopy;
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149 StubRoutines::_arrayof_jint_arraycopy =
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150 StubRoutines::_jint_arraycopy;
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151
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152 StubRoutines::_arrayof_jlong_disjoint_arraycopy =
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153 StubRoutines::_jlong_disjoint_arraycopy;
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154 StubRoutines::_arrayof_jlong_arraycopy =
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155 StubRoutines::_jlong_arraycopy;
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156
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157 StubRoutines::_arrayof_oop_disjoint_arraycopy =
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158 StubRoutines::_oop_disjoint_arraycopy;
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159 StubRoutines::_arrayof_oop_arraycopy =
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160 StubRoutines::_oop_arraycopy;
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161 }
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162
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163 void generate_initial() {
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164 // Generates all stubs and initializes the entry points
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165
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166 // entry points that exist in all platforms Note: This is code
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167 // that could be shared among different platforms - however the
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168 // benefit seems to be smaller than the disadvantage of having a
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169 // much more complicated generator structure. See also comment in
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170 // stubRoutines.hpp.
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171
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172 StubRoutines::_forward_exception_entry = ShouldNotCallThisStub();
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173 StubRoutines::_call_stub_entry = (address) call_stub;
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174 StubRoutines::_catch_exception_entry = ShouldNotCallThisStub();
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175
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176 // atomic calls
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177 StubRoutines::_atomic_xchg_entry = ShouldNotCallThisStub();
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178 StubRoutines::_atomic_xchg_ptr_entry = ShouldNotCallThisStub();
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179 StubRoutines::_atomic_cmpxchg_entry = ShouldNotCallThisStub();
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180 StubRoutines::_atomic_cmpxchg_ptr_entry = ShouldNotCallThisStub();
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181 StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();
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182 StubRoutines::_atomic_add_entry = ShouldNotCallThisStub();
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183 StubRoutines::_atomic_add_ptr_entry = ShouldNotCallThisStub();
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184 StubRoutines::_fence_entry = ShouldNotCallThisStub();
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185
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186 // amd64 does this here, sparc does it in generate_all()
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187 StubRoutines::_handler_for_unsafe_access_entry =
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188 ShouldNotCallThisStub();
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189 }
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190
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191 void generate_all() {
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192 // Generates all stubs and initializes the entry points
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193
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194 // These entry points require SharedInfo::stack0 to be set up in
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195 // non-core builds and need to be relocatable, so they each
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196 // fabricate a RuntimeStub internally.
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197 StubRoutines::_throw_AbstractMethodError_entry =
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198 ShouldNotCallThisStub();
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199
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200 StubRoutines::_throw_ArithmeticException_entry =
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201 ShouldNotCallThisStub();
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202
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203 StubRoutines::_throw_NullPointerException_entry =
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204 ShouldNotCallThisStub();
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205
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206 StubRoutines::_throw_NullPointerException_at_call_entry =
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207 ShouldNotCallThisStub();
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208
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209 StubRoutines::_throw_StackOverflowError_entry =
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210 ShouldNotCallThisStub();
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211
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212 // support for verify_oop (must happen after universe_init)
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213 StubRoutines::_verify_oop_subroutine_entry =
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214 ShouldNotCallThisStub();
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215
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216 // arraycopy stubs used by compilers
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217 generate_arraycopy_stubs();
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218 }
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219
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220 public:
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221 StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
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222 if (all) {
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223 generate_all();
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224 } else {
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225 generate_initial();
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226 }
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227 }
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228 };
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229
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230 void StubGenerator_generate(CodeBuffer* code, bool all) {
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231 StubGenerator g(code, all);
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232 }
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233
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234 EntryFrame *EntryFrame::build(const intptr_t* parameters,
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235 int parameter_words,
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236 JavaCallWrapper* call_wrapper,
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237 TRAPS) {
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238
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239 ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();
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240 stack->overflow_check(header_words + parameter_words, CHECK_NULL);
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241
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242 stack->push(0); // next_frame, filled in later
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243 intptr_t *fp = stack->sp();
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244 assert(fp - stack->sp() == next_frame_off, "should be");
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245
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246 stack->push(ENTRY_FRAME);
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247 assert(fp - stack->sp() == frame_type_off, "should be");
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248
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249 stack->push((intptr_t) call_wrapper);
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250 assert(fp - stack->sp() == call_wrapper_off, "should be");
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251
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252 for (int i = 0; i < parameter_words; i++)
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253 stack->push(parameters[i]);
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254
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255 return (EntryFrame *) fp;
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256 }
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