duke@435: /* coleenp@4643: * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: stefank@2314: #include "precompiled.hpp" stefank@2314: #include "interpreter/bytecodes.hpp" stefank@2314: #include "interpreter/interpreter.hpp" stefank@2314: #include "interpreter/rewriter.hpp" stefank@2314: #include "memory/gcLocker.hpp" stefank@2314: #include "memory/resourceArea.hpp" stefank@2314: #include "oops/generateOopMap.hpp" twisti@3969: #include "prims/methodHandles.hpp" duke@435: jrose@1161: // Computes a CPC map (new_index -> original_index) for constant pool entries duke@435: // that are referred to by the interpreter at runtime via the constant pool cache. jrose@1161: // Also computes a CP map (original_index -> new_index). jrose@1161: // Marks entries in CP which require additional processing. jrose@1161: void Rewriter::compute_index_maps() { jrose@1161: const int length = _pool->length(); coleenp@4037: init_maps(length); twisti@3969: bool saw_mh_symbol = false; duke@435: for (int i = 0; i < length; i++) { jrose@1161: int tag = _pool->tag_at(i).value(); jrose@1161: switch (tag) { jrose@1161: case JVM_CONSTANT_InterfaceMethodref: duke@435: case JVM_CONSTANT_Fieldref : // fall through duke@435: case JVM_CONSTANT_Methodref : // fall through coleenp@4037: add_cp_cache_entry(i); coleenp@4037: break; coleenp@4037: case JVM_CONSTANT_String: jrose@1957: case JVM_CONSTANT_MethodHandle : // fall through jrose@1957: case JVM_CONSTANT_MethodType : // fall through coleenp@4037: add_resolved_references_entry(i); jrose@1161: break; twisti@3969: case JVM_CONSTANT_Utf8: twisti@3969: if (_pool->symbol_at(i) == vmSymbols::java_lang_invoke_MethodHandle()) twisti@3969: saw_mh_symbol = true; twisti@3969: break; duke@435: } duke@435: } jrose@1161: coleenp@4037: // Record limits of resolved reference map for constant pool cache indices coleenp@4037: record_map_limits(); coleenp@4037: jrose@1161: guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1), jrose@1161: "all cp cache indexes fit in a u2"); jrose@2015: twisti@3969: if (saw_mh_symbol) twisti@3969: _method_handle_invokers.initialize(length, (int)0); duke@435: } duke@435: coleenp@2945: // Unrewrite the bytecodes if an error occurs. coleenp@6121: void Rewriter::restore_bytecodes() { coleenp@2945: int len = _methods->length(); coleenp@6121: bool invokespecial_error = false; coleenp@2945: coleenp@2945: for (int i = len-1; i >= 0; i--) { coleenp@4037: Method* method = _methods->at(i); coleenp@6121: scan_method(method, true, &invokespecial_error); coleenp@6121: assert(!invokespecial_error, "reversing should not get an invokespecial error"); coleenp@2945: } coleenp@2945: } duke@435: jrose@1161: // Creates a constant pool cache given a CPC map jrose@1161: void Rewriter::make_constant_pool_cache(TRAPS) { coleenp@4037: ClassLoaderData* loader_data = _pool->pool_holder()->class_loader_data(); coleenp@4037: ConstantPoolCache* cache = coleenp@6081: ConstantPoolCache::allocate(loader_data, _cp_cache_map, coleenp@6081: _invokedynamic_cp_cache_map, coleenp@4712: _invokedynamic_references_map, CHECK); coleenp@4037: coleenp@4037: // initialize object cache in constant pool coleenp@4037: _pool->initialize_resolved_references(loader_data, _resolved_references_map, coleenp@4037: _resolved_reference_limit, coleenp@4037: CHECK); jrose@1161: _pool->set_cache(cache); jrose@1161: cache->set_constant_pool(_pool()); duke@435: } duke@435: duke@435: duke@435: duke@435: // The new finalization semantics says that registration of duke@435: // finalizable objects must be performed on successful return from the duke@435: // Object. constructor. We could implement this trivially if duke@435: // were never rewritten but since JVMTI allows this to occur, a duke@435: // more complicated solution is required. A special return bytecode duke@435: // is used only by Object. to signal the finalization duke@435: // registration point. Additionally local 0 must be preserved so it's duke@435: // available to pass to the registration function. For simplicty we duke@435: // require that local 0 is never overwritten so it's available as an duke@435: // argument for registration. duke@435: duke@435: void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) { duke@435: RawBytecodeStream bcs(method); duke@435: while (!bcs.is_last_bytecode()) { duke@435: Bytecodes::Code opcode = bcs.raw_next(); duke@435: switch (opcode) { duke@435: case Bytecodes::_return: *bcs.bcp() = Bytecodes::_return_register_finalizer; break; duke@435: duke@435: case Bytecodes::_istore: duke@435: case Bytecodes::_lstore: duke@435: case Bytecodes::_fstore: duke@435: case Bytecodes::_dstore: duke@435: case Bytecodes::_astore: duke@435: if (bcs.get_index() != 0) continue; duke@435: duke@435: // fall through duke@435: case Bytecodes::_istore_0: duke@435: case Bytecodes::_lstore_0: duke@435: case Bytecodes::_fstore_0: duke@435: case Bytecodes::_dstore_0: duke@435: case Bytecodes::_astore_0: duke@435: THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), duke@435: "can't overwrite local 0 in Object."); duke@435: break; duke@435: } duke@435: } duke@435: } duke@435: duke@435: jrose@1161: // Rewrite a classfile-order CP index into a native-order CPC index. coleenp@2945: void Rewriter::rewrite_member_reference(address bcp, int offset, bool reverse) { jrose@1161: address p = bcp + offset; coleenp@2945: if (!reverse) { coleenp@2945: int cp_index = Bytes::get_Java_u2(p); coleenp@2945: int cache_index = cp_entry_to_cp_cache(cp_index); coleenp@2945: Bytes::put_native_u2(p, cache_index); twisti@3969: if (!_method_handle_invokers.is_empty()) coleenp@4037: maybe_rewrite_invokehandle(p - 1, cp_index, cache_index, reverse); coleenp@2945: } else { coleenp@2945: int cache_index = Bytes::get_native_u2(p); coleenp@2945: int pool_index = cp_cache_entry_pool_index(cache_index); coleenp@2945: Bytes::put_Java_u2(p, pool_index); twisti@3969: if (!_method_handle_invokers.is_empty()) coleenp@4037: maybe_rewrite_invokehandle(p - 1, pool_index, cache_index, reverse); twisti@3969: } twisti@3969: } twisti@3969: coleenp@6081: // If the constant pool entry for invokespecial is InterfaceMethodref, coleenp@6081: // we need to add a separate cpCache entry for its resolution, because it is coleenp@6081: // different than the resolution for invokeinterface with InterfaceMethodref. coleenp@6081: // These cannot share cpCache entries. It's unclear if all invokespecial to coleenp@6081: // InterfaceMethodrefs would resolve to the same thing so a new cpCache entry coleenp@6081: // is created for each one. This was added with lambda. coleenp@6121: void Rewriter::rewrite_invokespecial(address bcp, int offset, bool reverse, bool* invokespecial_error) { coleenp@6081: address p = bcp + offset; coleenp@6081: if (!reverse) { coleenp@6081: int cp_index = Bytes::get_Java_u2(p); coleenp@6121: if (_pool->tag_at(cp_index).is_interface_method()) { coleenp@6081: int cache_index = add_invokespecial_cp_cache_entry(cp_index); coleenp@6081: if (cache_index != (int)(jushort) cache_index) { coleenp@6121: *invokespecial_error = true; coleenp@6081: } coleenp@6081: Bytes::put_native_u2(p, cache_index); coleenp@6081: } else { coleenp@6121: rewrite_member_reference(bcp, offset, reverse); coleenp@6121: } coleenp@6121: } else { coleenp@6121: rewrite_member_reference(bcp, offset, reverse); coleenp@6081: } coleenp@6081: } coleenp@6081: twisti@3969: twisti@3969: // Adjust the invocation bytecode for a signature-polymorphic method (MethodHandle.invoke, etc.) coleenp@4037: void Rewriter::maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, bool reverse) { twisti@3969: if (!reverse) { twisti@3969: if ((*opc) == (u1)Bytecodes::_invokevirtual || twisti@3969: // allow invokespecial as an alias, although it would be very odd: twisti@3969: (*opc) == (u1)Bytecodes::_invokespecial) { twisti@3969: assert(_pool->tag_at(cp_index).is_method(), "wrong index"); twisti@3969: // Determine whether this is a signature-polymorphic method. twisti@3969: if (cp_index >= _method_handle_invokers.length()) return; twisti@3969: int status = _method_handle_invokers[cp_index]; twisti@3969: assert(status >= -1 && status <= 1, "oob tri-state"); twisti@3969: if (status == 0) { twisti@3969: if (_pool->klass_ref_at_noresolve(cp_index) == vmSymbols::java_lang_invoke_MethodHandle() && twisti@3969: MethodHandles::is_signature_polymorphic_name(SystemDictionary::MethodHandle_klass(), coleenp@4037: _pool->name_ref_at(cp_index))) { coleenp@4037: // we may need a resolved_refs entry for the appendix twisti@4133: add_invokedynamic_resolved_references_entries(cp_index, cache_index); twisti@3969: status = +1; coleenp@4037: } else { twisti@3969: status = -1; coleenp@4037: } twisti@3969: _method_handle_invokers[cp_index] = status; twisti@3969: } twisti@3969: // We use a special internal bytecode for such methods (if non-static). twisti@3969: // The basic reason for this is that such methods need an extra "appendix" argument twisti@3969: // to transmit the call site's intended call type. twisti@3969: if (status > 0) { twisti@3969: (*opc) = (u1)Bytecodes::_invokehandle; twisti@3969: } twisti@3969: } twisti@3969: } else { twisti@3969: // Do not need to look at cp_index. twisti@3969: if ((*opc) == (u1)Bytecodes::_invokehandle) { twisti@3969: (*opc) = (u1)Bytecodes::_invokevirtual; twisti@3969: // Ignore corner case of original _invokespecial instruction. twisti@3969: // This is safe because (a) the signature polymorphic method was final, and twisti@3969: // (b) the implementation of MethodHandle will not call invokespecial on it. twisti@3969: } coleenp@2945: } jrose@1161: } jrose@1161: jrose@1161: coleenp@2945: void Rewriter::rewrite_invokedynamic(address bcp, int offset, bool reverse) { jrose@1161: address p = bcp + offset; coleenp@2945: assert(p[-1] == Bytecodes::_invokedynamic, "not invokedynamic bytecode"); coleenp@2945: if (!reverse) { coleenp@2945: int cp_index = Bytes::get_Java_u2(p); coleenp@4037: int cache_index = add_invokedynamic_cp_cache_entry(cp_index); coleenp@6081: int resolved_index = add_invokedynamic_resolved_references_entries(cp_index, cache_index); coleenp@2945: // Replace the trailing four bytes with a CPC index for the dynamic coleenp@2945: // call site. Unlike other CPC entries, there is one per bytecode, coleenp@2945: // not just one per distinct CP entry. In other words, the coleenp@2945: // CPC-to-CP relation is many-to-one for invokedynamic entries. coleenp@2945: // This means we must use a larger index size than u2 to address coleenp@2945: // all these entries. That is the main reason invokedynamic coleenp@2945: // must have a five-byte instruction format. (Of course, other JVM coleenp@2945: // implementations can use the bytes for other purposes.) coleenp@6081: // Note: We use native_u4 format exclusively for 4-byte indexes. coleenp@4037: Bytes::put_native_u4(p, ConstantPool::encode_invokedynamic_index(cache_index)); coleenp@6081: // add the bcp in case we need to patch this bytecode if we also find a coleenp@6081: // invokespecial/InterfaceMethodref in the bytecode stream coleenp@6081: _patch_invokedynamic_bcps->push(p); coleenp@6081: _patch_invokedynamic_refs->push(resolved_index); coleenp@2945: } else { coleenp@4037: int cache_index = ConstantPool::decode_invokedynamic_index( coleenp@2945: Bytes::get_native_u4(p)); coleenp@6081: // We will reverse the bytecode rewriting _after_ adjusting them. coleenp@6081: // Adjust the cache index by offset to the invokedynamic entries in the coleenp@6081: // cpCache plus the delta if the invokedynamic bytecodes were adjusted. coleenp@6081: cache_index = cp_cache_delta() + _first_iteration_cp_cache_limit; coleenp@6081: int cp_index = invokedynamic_cp_cache_entry_pool_index(cache_index); coleenp@4037: assert(_pool->tag_at(cp_index).is_invoke_dynamic(), "wrong index"); coleenp@2945: // zero out 4 bytes coleenp@2945: Bytes::put_Java_u4(p, 0); coleenp@4037: Bytes::put_Java_u2(p, cp_index); coleenp@2945: } jrose@1161: } jrose@1161: coleenp@6081: void Rewriter::patch_invokedynamic_bytecodes() { coleenp@6081: // If the end of the cp_cache is the same as after initializing with the coleenp@6081: // cpool, nothing needs to be done. Invokedynamic bytecodes are at the coleenp@6081: // correct offsets. ie. no invokespecials added coleenp@6081: int delta = cp_cache_delta(); coleenp@6081: if (delta > 0) { coleenp@6081: int length = _patch_invokedynamic_bcps->length(); coleenp@6081: assert(length == _patch_invokedynamic_refs->length(), coleenp@6081: "lengths should match"); coleenp@6081: for (int i = 0; i < length; i++) { coleenp@6081: address p = _patch_invokedynamic_bcps->at(i); coleenp@6081: int cache_index = ConstantPool::decode_invokedynamic_index( coleenp@6081: Bytes::get_native_u4(p)); coleenp@6081: Bytes::put_native_u4(p, ConstantPool::encode_invokedynamic_index(cache_index + delta)); coleenp@6081: coleenp@6081: // invokedynamic resolved references map also points to cp cache and must coleenp@6081: // add delta to each. coleenp@6081: int resolved_index = _patch_invokedynamic_refs->at(i); coleenp@6081: for (int entry = 0; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { coleenp@6081: assert(_invokedynamic_references_map[resolved_index+entry] == cache_index, coleenp@6081: "should be the same index"); coleenp@6081: _invokedynamic_references_map.at_put(resolved_index+entry, coleenp@6081: cache_index + delta); coleenp@6081: } coleenp@6081: } coleenp@6081: } coleenp@6081: } coleenp@6081: jrose@1161: jrose@1957: // Rewrite some ldc bytecodes to _fast_aldc coleenp@2945: void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide, coleenp@2945: bool reverse) { coleenp@2945: if (!reverse) { coleenp@2945: assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "not ldc bytecode"); coleenp@2945: address p = bcp + offset; coleenp@2945: int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); coleenp@2945: constantTag tag = _pool->tag_at(cp_index).value(); coleenp@4643: if (tag.is_method_handle() || tag.is_method_type() || tag.is_string()) { coleenp@4037: int ref_index = cp_entry_to_resolved_references(cp_index); coleenp@2945: if (is_wide) { coleenp@2945: (*bcp) = Bytecodes::_fast_aldc_w; coleenp@4037: assert(ref_index == (u2)ref_index, "index overflow"); coleenp@4037: Bytes::put_native_u2(p, ref_index); coleenp@2945: } else { coleenp@2945: (*bcp) = Bytecodes::_fast_aldc; coleenp@4037: assert(ref_index == (u1)ref_index, "index overflow"); coleenp@4037: (*p) = (u1)ref_index; coleenp@2945: } coleenp@2945: } coleenp@2945: } else { coleenp@2945: Bytecodes::Code rewritten_bc = coleenp@2945: (is_wide ? Bytecodes::_fast_aldc_w : Bytecodes::_fast_aldc); coleenp@2945: if ((*bcp) == rewritten_bc) { coleenp@2945: address p = bcp + offset; coleenp@4037: int ref_index = is_wide ? Bytes::get_native_u2(p) : (u1)(*p); coleenp@4037: int pool_index = resolved_references_entry_to_pool_index(ref_index); coleenp@2945: if (is_wide) { coleenp@2945: (*bcp) = Bytecodes::_ldc_w; coleenp@2945: assert(pool_index == (u2)pool_index, "index overflow"); coleenp@2945: Bytes::put_Java_u2(p, pool_index); coleenp@2945: } else { coleenp@2945: (*bcp) = Bytecodes::_ldc; coleenp@2945: assert(pool_index == (u1)pool_index, "index overflow"); coleenp@2945: (*p) = (u1)pool_index; coleenp@2945: } jrose@1957: } jrose@1957: } jrose@1957: } jrose@1957: jrose@1957: duke@435: // Rewrites a method given the index_map information coleenp@6121: void Rewriter::scan_method(Method* method, bool reverse, bool* invokespecial_error) { duke@435: duke@435: int nof_jsrs = 0; duke@435: bool has_monitor_bytecodes = false; duke@435: duke@435: { duke@435: // We cannot tolerate a GC in this block, because we've coleenp@4037: // cached the bytecodes in 'code_base'. If the Method* duke@435: // moves, the bytecodes will also move. duke@435: No_Safepoint_Verifier nsv; duke@435: Bytecodes::Code c; duke@435: duke@435: // Bytecodes and their length duke@435: const address code_base = method->code_base(); duke@435: const int code_length = method->code_size(); duke@435: duke@435: int bc_length; duke@435: for (int bci = 0; bci < code_length; bci += bc_length) { duke@435: address bcp = code_base + bci; jrose@1161: int prefix_length = 0; duke@435: c = (Bytecodes::Code)(*bcp); duke@435: duke@435: // Since we have the code, see if we can get the length duke@435: // directly. Some more complicated bytecodes will report duke@435: // a length of zero, meaning we need to make another method duke@435: // call to calculate the length. duke@435: bc_length = Bytecodes::length_for(c); duke@435: if (bc_length == 0) { never@2462: bc_length = Bytecodes::length_at(method, bcp); duke@435: duke@435: // length_at will put us at the bytecode after the one modified duke@435: // by 'wide'. We don't currently examine any of the bytecodes duke@435: // modified by wide, but in case we do in the future... duke@435: if (c == Bytecodes::_wide) { jrose@1161: prefix_length = 1; duke@435: c = (Bytecodes::Code)bcp[1]; duke@435: } duke@435: } duke@435: duke@435: assert(bc_length != 0, "impossible bytecode length"); duke@435: duke@435: switch (c) { duke@435: case Bytecodes::_lookupswitch : { duke@435: #ifndef CC_INTERP never@2462: Bytecode_lookupswitch bc(method, bcp); jrose@1920: (*bcp) = ( never@2462: bc.number_of_pairs() < BinarySwitchThreshold duke@435: ? Bytecodes::_fast_linearswitch duke@435: : Bytecodes::_fast_binaryswitch duke@435: ); duke@435: #endif duke@435: break; duke@435: } coleenp@2945: case Bytecodes::_fast_linearswitch: coleenp@2945: case Bytecodes::_fast_binaryswitch: { coleenp@2945: #ifndef CC_INTERP coleenp@2945: (*bcp) = Bytecodes::_lookupswitch; coleenp@2945: #endif coleenp@2945: break; coleenp@2945: } coleenp@6081: coleenp@6081: case Bytecodes::_invokespecial : { coleenp@6121: rewrite_invokespecial(bcp, prefix_length+1, reverse, invokespecial_error); coleenp@6081: break; coleenp@6081: } coleenp@6081: duke@435: case Bytecodes::_getstatic : // fall through duke@435: case Bytecodes::_putstatic : // fall through duke@435: case Bytecodes::_getfield : // fall through duke@435: case Bytecodes::_putfield : // fall through duke@435: case Bytecodes::_invokevirtual : // fall through jrose@1161: case Bytecodes::_invokestatic : jrose@1161: case Bytecodes::_invokeinterface: twisti@3969: case Bytecodes::_invokehandle : // if reverse=true coleenp@2945: rewrite_member_reference(bcp, prefix_length+1, reverse); duke@435: break; jrose@1161: case Bytecodes::_invokedynamic: coleenp@2945: rewrite_invokedynamic(bcp, prefix_length+1, reverse); jrose@1161: break; jrose@1957: case Bytecodes::_ldc: twisti@3969: case Bytecodes::_fast_aldc: // if reverse=true coleenp@2945: maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse); jrose@1957: break; jrose@1957: case Bytecodes::_ldc_w: twisti@3969: case Bytecodes::_fast_aldc_w: // if reverse=true coleenp@2945: maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse); jrose@1957: break; duke@435: case Bytecodes::_jsr : // fall through duke@435: case Bytecodes::_jsr_w : nof_jsrs++; break; duke@435: case Bytecodes::_monitorenter : // fall through duke@435: case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; duke@435: } duke@435: } duke@435: } duke@435: duke@435: // Update access flags duke@435: if (has_monitor_bytecodes) { duke@435: method->set_has_monitor_bytecodes(); duke@435: } duke@435: duke@435: // The present of a jsr bytecode implies that the method might potentially duke@435: // have to be rewritten, so we run the oopMapGenerator on the method duke@435: if (nof_jsrs > 0) { duke@435: method->set_has_jsrs(); jrose@1161: // Second pass will revisit this method. coleenp@2945: assert(method->has_jsrs(), "didn't we just set this?"); jrose@1161: } jrose@1161: } duke@435: jrose@1161: // After constant pool is created, revisit methods containing jsrs. jrose@1161: methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { coleenp@2945: ResourceMark rm(THREAD); jrose@1161: ResolveOopMapConflicts romc(method); jrose@1161: methodHandle original_method = method; jrose@1161: method = romc.do_potential_rewrite(CHECK_(methodHandle())); jrose@1161: // Update monitor matching info. jrose@1161: if (romc.monitor_safe()) { jrose@1161: method->set_guaranteed_monitor_matching(); jrose@1161: } duke@435: duke@435: return method; duke@435: } duke@435: duke@435: void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { duke@435: ResourceMark rm(THREAD); twisti@1573: Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); jrose@1161: // (That's all, folks.) jrose@1161: } jrose@1161: twisti@1573: coleenp@4037: Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array* methods, TRAPS) jrose@1161: : _klass(klass), twisti@1573: _pool(cpool), twisti@1573: _methods(methods) jrose@1161: { jrose@1161: assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); duke@435: coleenp@4037: // determine index maps for Method* rewriting jrose@1161: compute_index_maps(); duke@435: jrose@1161: if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { jrose@1291: bool did_rewrite = false; jrose@1161: int i = _methods->length(); duke@435: while (i-- > 0) { coleenp@4037: Method* method = _methods->at(i); duke@435: if (method->intrinsic_id() == vmIntrinsics::_Object_init) { duke@435: // rewrite the return bytecodes of Object. to register the duke@435: // object for finalization if needed. duke@435: methodHandle m(THREAD, method); duke@435: rewrite_Object_init(m, CHECK); jrose@1291: did_rewrite = true; duke@435: break; duke@435: } duke@435: } jrose@1291: assert(did_rewrite, "must find Object:: to rewrite it"); duke@435: } duke@435: jrose@1161: // rewrite methods, in two passes coleenp@2945: int len = _methods->length(); coleenp@6121: bool invokespecial_error = false; jrose@1161: coleenp@2945: for (int i = len-1; i >= 0; i--) { coleenp@4037: Method* method = _methods->at(i); coleenp@6121: scan_method(method, false, &invokespecial_error); coleenp@6121: if (invokespecial_error) { coleenp@6121: // If you get an error here, there is no reversing bytecodes coleenp@6121: // This exception is stored for this class and no further attempt is coleenp@6121: // made at verifying or rewriting. coleenp@6121: THROW_MSG(vmSymbols::java_lang_InternalError(), coleenp@6121: "This classfile overflows invokespecial for interfaces " coleenp@6121: "and cannot be loaded"); coleenp@6121: return; coleenp@6121: } jrose@1161: } jrose@1161: coleenp@6081: // May have to fix invokedynamic bytecodes if invokestatic/InterfaceMethodref coleenp@6081: // entries had to be added. coleenp@6081: patch_invokedynamic_bytecodes(); coleenp@6081: jrose@1161: // allocate constant pool cache, now that we've seen all the bytecodes coleenp@2945: make_constant_pool_cache(THREAD); jrose@1161: coleenp@2945: // Restore bytecodes to their unrewritten state if there are exceptions coleenp@2945: // rewriting bytecodes or allocating the cpCache coleenp@2945: if (HAS_PENDING_EXCEPTION) { coleenp@6121: restore_bytecodes(); coleenp@2945: return; coleenp@2945: } coleenp@2945: coleenp@4395: // Relocate after everything, but still do this under the is_rewritten flag, coleenp@4395: // so methods with jsrs in custom class lists in aren't attempted to be coleenp@4395: // rewritten in the RO section of the shared archive. coleenp@4395: // Relocated bytecodes don't have to be restored, only the cp cache entries coleenp@2945: for (int i = len-1; i >= 0; i--) { coleenp@4395: methodHandle m(THREAD, _methods->at(i)); jrose@1161: jrose@1161: if (m->has_jsrs()) { coleenp@4395: m = rewrite_jsrs(m, THREAD); coleenp@4395: // Restore bytecodes to their unrewritten state if there are exceptions coleenp@4395: // relocating bytecodes. If some are relocated, that is ok because that coleenp@4395: // doesn't affect constant pool to cpCache rewriting. coleenp@4395: if (HAS_PENDING_EXCEPTION) { coleenp@6121: restore_bytecodes(); coleenp@4395: return; coleenp@4395: } duke@435: // Method might have gotten rewritten. coleenp@4037: methods->at_put(i, m()); duke@435: } duke@435: } duke@435: }