Mercurial > hg > graal-compiler
annotate src/share/vm/interpreter/rewriter.cpp @ 7046:b6a8f2d23057
VM support for deferred reads and writes: ScopeDesc, DebugInfo, DebugInfoRecorder
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 27 Nov 2012 13:43:04 +0100 |
parents | e522a00b91aa |
children | 5d0bb7d52783 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "interpreter/bytecodes.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "interpreter/rewriter.hpp" | |
29 #include "memory/gcLocker.hpp" | |
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30 #include "memory/metadataFactory.hpp" |
1972 | 31 #include "memory/oopFactory.hpp" |
32 #include "memory/resourceArea.hpp" | |
33 #include "oops/generateOopMap.hpp" | |
34 #include "oops/objArrayOop.hpp" | |
35 #include "oops/oop.inline.hpp" | |
36 #include "prims/methodComparator.hpp" | |
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37 #include "prims/methodHandles.hpp" |
0 | 38 |
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39 // Computes a CPC map (new_index -> original_index) for constant pool entries |
0 | 40 // that are referred to by the interpreter at runtime via the constant pool cache. |
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41 // Also computes a CP map (original_index -> new_index). |
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42 // Marks entries in CP which require additional processing. |
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43 void Rewriter::compute_index_maps() { |
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44 const int length = _pool->length(); |
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45 init_maps(length); |
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46 bool saw_mh_symbol = false; |
0 | 47 for (int i = 0; i < length; i++) { |
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48 int tag = _pool->tag_at(i).value(); |
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49 switch (tag) { |
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50 case JVM_CONSTANT_InterfaceMethodref: |
0 | 51 case JVM_CONSTANT_Fieldref : // fall through |
52 case JVM_CONSTANT_Methodref : // fall through | |
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53 add_cp_cache_entry(i); |
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54 break; |
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55 case JVM_CONSTANT_String: |
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56 case JVM_CONSTANT_Object: |
1602 | 57 case JVM_CONSTANT_MethodHandle : // fall through |
58 case JVM_CONSTANT_MethodType : // fall through | |
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59 add_resolved_references_entry(i); |
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60 break; |
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61 case JVM_CONSTANT_Utf8: |
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62 if (_pool->symbol_at(i) == vmSymbols::java_lang_invoke_MethodHandle()) |
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63 saw_mh_symbol = true; |
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64 break; |
0 | 65 } |
66 } | |
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67 |
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68 // Record limits of resolved reference map for constant pool cache indices |
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69 record_map_limits(); |
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70 |
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71 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1), |
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72 "all cp cache indexes fit in a u2"); |
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73 |
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74 if (saw_mh_symbol) |
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75 _method_handle_invokers.initialize(length, (int)0); |
0 | 76 } |
77 | |
3404 | 78 // Unrewrite the bytecodes if an error occurs. |
79 void Rewriter::restore_bytecodes() { | |
80 int len = _methods->length(); | |
81 | |
82 for (int i = len-1; i >= 0; i--) { | |
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83 Method* method = _methods->at(i); |
3404 | 84 scan_method(method, true); |
85 } | |
86 } | |
0 | 87 |
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88 // Creates a constant pool cache given a CPC map |
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89 void Rewriter::make_constant_pool_cache(TRAPS) { |
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90 const int length = _cp_cache_map.length(); |
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91 ClassLoaderData* loader_data = _pool->pool_holder()->class_loader_data(); |
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92 ConstantPoolCache* cache = |
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93 ConstantPoolCache::allocate(loader_data, length, CHECK); |
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94 |
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95 // initialize object cache in constant pool |
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96 _pool->initialize_resolved_references(loader_data, _resolved_references_map, |
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97 _resolved_reference_limit, |
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98 CHECK); |
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99 |
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100 No_Safepoint_Verifier nsv; |
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101 cache->initialize(_cp_cache_map, _invokedynamic_references_map); |
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102 _pool->set_cache(cache); |
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103 cache->set_constant_pool(_pool()); |
0 | 104 } |
105 | |
106 | |
107 | |
108 // The new finalization semantics says that registration of | |
109 // finalizable objects must be performed on successful return from the | |
110 // Object.<init> constructor. We could implement this trivially if | |
111 // <init> were never rewritten but since JVMTI allows this to occur, a | |
112 // more complicated solution is required. A special return bytecode | |
113 // is used only by Object.<init> to signal the finalization | |
114 // registration point. Additionally local 0 must be preserved so it's | |
115 // available to pass to the registration function. For simplicty we | |
116 // require that local 0 is never overwritten so it's available as an | |
117 // argument for registration. | |
118 | |
119 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) { | |
120 RawBytecodeStream bcs(method); | |
121 while (!bcs.is_last_bytecode()) { | |
122 Bytecodes::Code opcode = bcs.raw_next(); | |
123 switch (opcode) { | |
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124 case Bytecodes::_return: |
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125 #ifndef GRAAL |
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126 *bcs.bcp() = Bytecodes::_return_register_finalizer; |
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127 #endif |
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128 break; |
0 | 129 |
130 case Bytecodes::_istore: | |
131 case Bytecodes::_lstore: | |
132 case Bytecodes::_fstore: | |
133 case Bytecodes::_dstore: | |
134 case Bytecodes::_astore: | |
135 if (bcs.get_index() != 0) continue; | |
136 | |
137 // fall through | |
138 case Bytecodes::_istore_0: | |
139 case Bytecodes::_lstore_0: | |
140 case Bytecodes::_fstore_0: | |
141 case Bytecodes::_dstore_0: | |
142 case Bytecodes::_astore_0: | |
143 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), | |
144 "can't overwrite local 0 in Object.<init>"); | |
145 break; | |
146 } | |
147 } | |
148 } | |
149 | |
150 | |
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151 // Rewrite a classfile-order CP index into a native-order CPC index. |
3404 | 152 void Rewriter::rewrite_member_reference(address bcp, int offset, bool reverse) { |
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153 address p = bcp + offset; |
3404 | 154 if (!reverse) { |
155 int cp_index = Bytes::get_Java_u2(p); | |
156 int cache_index = cp_entry_to_cp_cache(cp_index); | |
157 Bytes::put_native_u2(p, cache_index); | |
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158 if (!_method_handle_invokers.is_empty()) |
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159 maybe_rewrite_invokehandle(p - 1, cp_index, cache_index, reverse); |
3404 | 160 } else { |
161 int cache_index = Bytes::get_native_u2(p); | |
162 int pool_index = cp_cache_entry_pool_index(cache_index); | |
163 Bytes::put_Java_u2(p, pool_index); | |
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164 if (!_method_handle_invokers.is_empty()) |
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165 maybe_rewrite_invokehandle(p - 1, pool_index, cache_index, reverse); |
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166 } |
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167 } |
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168 |
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169 |
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170 // Adjust the invocation bytecode for a signature-polymorphic method (MethodHandle.invoke, etc.) |
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171 void Rewriter::maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, bool reverse) { |
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172 if (!reverse) { |
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173 if ((*opc) == (u1)Bytecodes::_invokevirtual || |
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174 // allow invokespecial as an alias, although it would be very odd: |
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175 (*opc) == (u1)Bytecodes::_invokespecial) { |
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176 assert(_pool->tag_at(cp_index).is_method(), "wrong index"); |
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177 // Determine whether this is a signature-polymorphic method. |
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178 if (cp_index >= _method_handle_invokers.length()) return; |
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179 int status = _method_handle_invokers[cp_index]; |
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180 assert(status >= -1 && status <= 1, "oob tri-state"); |
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181 if (status == 0) { |
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182 if (_pool->klass_ref_at_noresolve(cp_index) == vmSymbols::java_lang_invoke_MethodHandle() && |
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183 MethodHandles::is_signature_polymorphic_name(SystemDictionary::MethodHandle_klass(), |
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184 _pool->name_ref_at(cp_index))) { |
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185 // we may need a resolved_refs entry for the appendix |
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186 add_invokedynamic_resolved_references_entries(cp_index, cache_index); |
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187 status = +1; |
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188 } else { |
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189 status = -1; |
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190 } |
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191 _method_handle_invokers[cp_index] = status; |
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192 } |
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193 // We use a special internal bytecode for such methods (if non-static). |
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194 // The basic reason for this is that such methods need an extra "appendix" argument |
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195 // to transmit the call site's intended call type. |
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196 if (status > 0) { |
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197 (*opc) = (u1)Bytecodes::_invokehandle; |
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198 } |
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199 } |
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200 } else { |
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201 // Do not need to look at cp_index. |
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202 if ((*opc) == (u1)Bytecodes::_invokehandle) { |
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203 (*opc) = (u1)Bytecodes::_invokevirtual; |
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204 // Ignore corner case of original _invokespecial instruction. |
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205 // This is safe because (a) the signature polymorphic method was final, and |
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206 // (b) the implementation of MethodHandle will not call invokespecial on it. |
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207 } |
3404 | 208 } |
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209 } |
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210 |
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211 |
3404 | 212 void Rewriter::rewrite_invokedynamic(address bcp, int offset, bool reverse) { |
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213 address p = bcp + offset; |
3404 | 214 assert(p[-1] == Bytecodes::_invokedynamic, "not invokedynamic bytecode"); |
215 if (!reverse) { | |
216 int cp_index = Bytes::get_Java_u2(p); | |
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217 int cache_index = add_invokedynamic_cp_cache_entry(cp_index); |
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218 add_invokedynamic_resolved_references_entries(cp_index, cache_index); |
3404 | 219 // Replace the trailing four bytes with a CPC index for the dynamic |
220 // call site. Unlike other CPC entries, there is one per bytecode, | |
221 // not just one per distinct CP entry. In other words, the | |
222 // CPC-to-CP relation is many-to-one for invokedynamic entries. | |
223 // This means we must use a larger index size than u2 to address | |
224 // all these entries. That is the main reason invokedynamic | |
225 // must have a five-byte instruction format. (Of course, other JVM | |
226 // implementations can use the bytes for other purposes.) | |
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227 Bytes::put_native_u4(p, ConstantPool::encode_invokedynamic_index(cache_index)); |
3404 | 228 // Note: We use native_u4 format exclusively for 4-byte indexes. |
229 } else { | |
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230 // callsite index |
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231 int cache_index = ConstantPool::decode_invokedynamic_index( |
3404 | 232 Bytes::get_native_u4(p)); |
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233 int cp_index = cp_cache_entry_pool_index(cache_index); |
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234 assert(_pool->tag_at(cp_index).is_invoke_dynamic(), "wrong index"); |
3404 | 235 // zero out 4 bytes |
236 Bytes::put_Java_u4(p, 0); | |
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237 Bytes::put_Java_u2(p, cp_index); |
3404 | 238 } |
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239 } |
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240 |
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241 |
1602 | 242 // Rewrite some ldc bytecodes to _fast_aldc |
3404 | 243 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide, |
244 bool reverse) { | |
245 if (!reverse) { | |
246 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "not ldc bytecode"); | |
247 address p = bcp + offset; | |
248 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); | |
249 constantTag tag = _pool->tag_at(cp_index).value(); | |
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250 if (tag.is_method_handle() || tag.is_method_type() || tag.is_string() || tag.is_object()) { |
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251 int ref_index = cp_entry_to_resolved_references(cp_index); |
3404 | 252 if (is_wide) { |
253 (*bcp) = Bytecodes::_fast_aldc_w; | |
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254 assert(ref_index == (u2)ref_index, "index overflow"); |
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255 Bytes::put_native_u2(p, ref_index); |
3404 | 256 } else { |
257 (*bcp) = Bytecodes::_fast_aldc; | |
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258 assert(ref_index == (u1)ref_index, "index overflow"); |
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259 (*p) = (u1)ref_index; |
3404 | 260 } |
261 } | |
262 } else { | |
263 Bytecodes::Code rewritten_bc = | |
264 (is_wide ? Bytecodes::_fast_aldc_w : Bytecodes::_fast_aldc); | |
265 if ((*bcp) == rewritten_bc) { | |
266 address p = bcp + offset; | |
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267 int ref_index = is_wide ? Bytes::get_native_u2(p) : (u1)(*p); |
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268 int pool_index = resolved_references_entry_to_pool_index(ref_index); |
3404 | 269 if (is_wide) { |
270 (*bcp) = Bytecodes::_ldc_w; | |
271 assert(pool_index == (u2)pool_index, "index overflow"); | |
272 Bytes::put_Java_u2(p, pool_index); | |
273 } else { | |
274 (*bcp) = Bytecodes::_ldc; | |
275 assert(pool_index == (u1)pool_index, "index overflow"); | |
276 (*p) = (u1)pool_index; | |
277 } | |
1602 | 278 } |
279 } | |
280 } | |
281 | |
282 | |
0 | 283 // Rewrites a method given the index_map information |
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284 void Rewriter::scan_method(Method* method, bool reverse) { |
0 | 285 |
286 int nof_jsrs = 0; | |
287 bool has_monitor_bytecodes = false; | |
288 | |
289 { | |
290 // We cannot tolerate a GC in this block, because we've | |
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291 // cached the bytecodes in 'code_base'. If the Method* |
0 | 292 // moves, the bytecodes will also move. |
293 No_Safepoint_Verifier nsv; | |
294 Bytecodes::Code c; | |
295 | |
296 // Bytecodes and their length | |
297 const address code_base = method->code_base(); | |
298 const int code_length = method->code_size(); | |
299 | |
300 int bc_length; | |
301 for (int bci = 0; bci < code_length; bci += bc_length) { | |
302 address bcp = code_base + bci; | |
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303 int prefix_length = 0; |
0 | 304 c = (Bytecodes::Code)(*bcp); |
305 | |
306 // Since we have the code, see if we can get the length | |
307 // directly. Some more complicated bytecodes will report | |
308 // a length of zero, meaning we need to make another method | |
309 // call to calculate the length. | |
310 bc_length = Bytecodes::length_for(c); | |
311 if (bc_length == 0) { | |
2142 | 312 bc_length = Bytecodes::length_at(method, bcp); |
0 | 313 |
314 // length_at will put us at the bytecode after the one modified | |
315 // by 'wide'. We don't currently examine any of the bytecodes | |
316 // modified by wide, but in case we do in the future... | |
317 if (c == Bytecodes::_wide) { | |
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318 prefix_length = 1; |
0 | 319 c = (Bytecodes::Code)bcp[1]; |
320 } | |
321 } | |
322 | |
323 assert(bc_length != 0, "impossible bytecode length"); | |
324 | |
325 switch (c) { | |
326 case Bytecodes::_lookupswitch : { | |
327 #ifndef CC_INTERP | |
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328 #ifndef GRAAL |
2181 | 329 Bytecode_lookupswitch bc(method, bcp); |
1930 | 330 (*bcp) = ( |
2181 | 331 bc.number_of_pairs() < BinarySwitchThreshold |
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332 ? Bytecodes::_fast_linearswitch |
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333 : Bytecodes::_fast_binaryswitch |
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334 ); |
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335 #endif |
0 | 336 #endif |
337 break; | |
338 } | |
3404 | 339 case Bytecodes::_fast_linearswitch: |
340 case Bytecodes::_fast_binaryswitch: { | |
341 #ifndef CC_INTERP | |
342 (*bcp) = Bytecodes::_lookupswitch; | |
343 #endif | |
344 break; | |
345 } | |
0 | 346 case Bytecodes::_getstatic : // fall through |
347 case Bytecodes::_putstatic : // fall through | |
348 case Bytecodes::_getfield : // fall through | |
349 case Bytecodes::_putfield : // fall through | |
350 case Bytecodes::_invokevirtual : // fall through | |
351 case Bytecodes::_invokespecial : // fall through | |
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352 case Bytecodes::_invokestatic : |
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353 case Bytecodes::_invokeinterface: |
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354 case Bytecodes::_invokehandle : // if reverse=true |
3404 | 355 rewrite_member_reference(bcp, prefix_length+1, reverse); |
0 | 356 break; |
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357 case Bytecodes::_invokedynamic: |
3404 | 358 rewrite_invokedynamic(bcp, prefix_length+1, reverse); |
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359 break; |
1602 | 360 case Bytecodes::_ldc: |
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361 case Bytecodes::_fast_aldc: // if reverse=true |
3404 | 362 maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse); |
1602 | 363 break; |
364 case Bytecodes::_ldc_w: | |
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365 case Bytecodes::_fast_aldc_w: // if reverse=true |
3404 | 366 maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse); |
1602 | 367 break; |
0 | 368 case Bytecodes::_jsr : // fall through |
369 case Bytecodes::_jsr_w : nof_jsrs++; break; | |
370 case Bytecodes::_monitorenter : // fall through | |
371 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; | |
372 } | |
373 } | |
374 } | |
375 | |
376 // Update access flags | |
377 if (has_monitor_bytecodes) { | |
378 method->set_has_monitor_bytecodes(); | |
379 } | |
380 | |
381 // The present of a jsr bytecode implies that the method might potentially | |
382 // have to be rewritten, so we run the oopMapGenerator on the method | |
383 if (nof_jsrs > 0) { | |
384 method->set_has_jsrs(); | |
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385 // Second pass will revisit this method. |
3404 | 386 assert(method->has_jsrs(), "didn't we just set this?"); |
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387 } |
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388 } |
0 | 389 |
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390 // After constant pool is created, revisit methods containing jsrs. |
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391 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { |
3404 | 392 ResourceMark rm(THREAD); |
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393 ResolveOopMapConflicts romc(method); |
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394 methodHandle original_method = method; |
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395 method = romc.do_potential_rewrite(CHECK_(methodHandle())); |
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396 // Update monitor matching info. |
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397 if (romc.monitor_safe()) { |
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398 method->set_guaranteed_monitor_matching(); |
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399 } |
0 | 400 |
401 return method; | |
402 } | |
403 | |
404 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { | |
405 ResourceMark rm(THREAD); | |
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406 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); |
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407 // (That's all, folks.) |
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408 } |
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409 |
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410 |
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411 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS) { |
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412 ResourceMark rm(THREAD); |
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413 Rewriter rw(klass, cpool, methods, CHECK); |
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414 // (That's all, folks.) |
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415 } |
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416 |
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417 |
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418 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS) |
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419 : _klass(klass), |
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420 _pool(cpool), |
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421 _methods(methods) |
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422 { |
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423 assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); |
0 | 424 |
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425 // determine index maps for Method* rewriting |
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426 compute_index_maps(); |
0 | 427 |
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428 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { |
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429 bool did_rewrite = false; |
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430 int i = _methods->length(); |
0 | 431 while (i-- > 0) { |
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432 Method* method = _methods->at(i); |
0 | 433 if (method->intrinsic_id() == vmIntrinsics::_Object_init) { |
434 // rewrite the return bytecodes of Object.<init> to register the | |
435 // object for finalization if needed. | |
436 methodHandle m(THREAD, method); | |
437 rewrite_Object_init(m, CHECK); | |
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438 did_rewrite = true; |
0 | 439 break; |
440 } | |
441 } | |
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442 assert(did_rewrite, "must find Object::<init> to rewrite it"); |
0 | 443 } |
444 | |
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445 // rewrite methods, in two passes |
3404 | 446 int len = _methods->length(); |
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447 |
3404 | 448 for (int i = len-1; i >= 0; i--) { |
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449 Method* method = _methods->at(i); |
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450 scan_method(method); |
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451 } |
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452 |
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453 // allocate constant pool cache, now that we've seen all the bytecodes |
3404 | 454 make_constant_pool_cache(THREAD); |
455 | |
456 // Restore bytecodes to their unrewritten state if there are exceptions | |
457 // rewriting bytecodes or allocating the cpCache | |
458 if (HAS_PENDING_EXCEPTION) { | |
459 restore_bytecodes(); | |
460 return; | |
461 } | |
462 } | |
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463 |
3404 | 464 // Relocate jsr/rets in a method. This can't be done with the rewriter |
465 // stage because it can throw other exceptions, leaving the bytecodes | |
466 // pointing at constant pool cache entries. | |
467 // Link and check jvmti dependencies while we're iterating over the methods. | |
468 // JSR292 code calls with a different set of methods, so two entry points. | |
469 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, TRAPS) { | |
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470 relocate_and_link(this_oop, this_oop->methods(), THREAD); |
3404 | 471 } |
472 | |
473 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, | |
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474 Array<Method*>* methods, TRAPS) { |
3404 | 475 int len = methods->length(); |
476 for (int i = len-1; i >= 0; i--) { | |
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477 methodHandle m(THREAD, methods->at(i)); |
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478 |
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479 if (m->has_jsrs()) { |
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480 m = rewrite_jsrs(m, CHECK); |
0 | 481 // Method might have gotten rewritten. |
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482 methods->at_put(i, m()); |
0 | 483 } |
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484 |
3404 | 485 // Set up method entry points for compiler and interpreter . |
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486 m->link_method(m, CHECK); |
1574 | 487 |
3404 | 488 // This is for JVMTI and unrelated to relocator but the last thing we do |
1574 | 489 #ifdef ASSERT |
490 if (StressMethodComparator) { | |
491 static int nmc = 0; | |
492 for (int j = i; j >= 0 && j >= i-4; j--) { | |
493 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc); | |
3404 | 494 bool z = MethodComparator::methods_EMCP(m(), |
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495 methods->at(j)); |
1574 | 496 if (j == i && !z) { |
497 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes(); | |
498 assert(z, "method must compare equal to itself"); | |
499 } | |
500 } | |
501 } | |
502 #endif //ASSERT | |
0 | 503 } |
504 } |