1 /* 2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_INTERPRETER_BOOTSTRAPINFO_HPP 26 #define SHARE_INTERPRETER_BOOTSTRAPINFO_HPP 27 28 #include "oops/constantPool.hpp" 29 #include "oops/instanceKlass.hpp" 30 31 // BootstrapInfo provides condensed information from the constant pool 32 // necessary to invoke a bootstrap method. 33 class BootstrapInfo : public StackObj { 34 constantPoolHandle _pool; // constant pool containing the bootstrap specifier 35 const int _bss_index; // index of bootstrap specifier in CP (condy or indy) 36 const int _indy_index; // internal index of indy call site, or -1 if a condy call 37 const int _argc; // number of static arguments 38 Symbol* _name; // extracted from JVM_CONSTANT_NameAndType 39 Symbol* _signature; 40 41 // pre-bootstrap resolution state: 42 Handle _bsm; // resolved bootstrap method 43 Handle _name_arg; // resolved String 44 Handle _type_arg; // resolved Class or MethodType 45 Handle _arg_values; // array of static arguments; null implies either 46 // uresolved or zero static arguments are specified 47 48 // post-bootstrap resolution state: 49 bool _is_resolved; // set true when any of the next fields are set 50 Handle _resolved_value; // bind this as condy constant 51 methodHandle _resolved_method; // bind this as indy behavior 52 Handle _resolved_appendix; // extra opaque static argument for _resolved_method 53 54 public: 55 BootstrapInfo(const constantPoolHandle& pool, int bss_index, int indy_index = -1); 56 57 // accessors pool() const58 const constantPoolHandle& pool() const{ return _pool; } bss_index() const59 int bss_index() const { return _bss_index; } indy_index() const60 int indy_index() const { return _indy_index; } argc() const61 int argc() const { return _argc; } is_method_call() const62 bool is_method_call() const { return (_indy_index != -1); } name() const63 Symbol* name() const { return _name; } signature() const64 Symbol* signature() const { return _signature; } 65 66 // accessors to lazy state bsm() const67 Handle bsm() const { return _bsm; } name_arg() const68 Handle name_arg() const { return _name_arg; } type_arg() const69 Handle type_arg() const { return _type_arg; } arg_values() const70 Handle arg_values() const { return _arg_values; } is_resolved() const71 bool is_resolved() const { return _is_resolved; } resolved_value() const72 Handle resolved_value() const { assert(!is_method_call(), ""); return _resolved_value; } resolved_method() const73 methodHandle resolved_method() const { assert(is_method_call(), ""); return _resolved_method; } resolved_appendix() const74 Handle resolved_appendix() const { assert(is_method_call(), ""); return _resolved_appendix; } 75 76 // derived accessors caller() const77 InstanceKlass* caller() const { return _pool->pool_holder(); } caller_mirror() const78 oop caller_mirror() const { return caller()->java_mirror(); } decode_indy_index() const79 int decode_indy_index() const { return ConstantPool::decode_invokedynamic_index(_indy_index); } bsms_attr_index() const80 int bsms_attr_index() const { return _pool->bootstrap_methods_attribute_index(_bss_index); } bsm_index() const81 int bsm_index() const { return _pool->bootstrap_method_ref_index_at(_bss_index); } 82 //int argc() is eagerly cached in _argc arg_index(int i) const83 int arg_index(int i) const { return _pool->bootstrap_argument_index_at(_bss_index, i); } 84 85 // CP cache entry for call site (indy only) invokedynamic_cp_cache_entry() const86 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry() const { 87 assert(is_method_call(), ""); 88 return _pool->invokedynamic_cp_cache_entry_at(_indy_index); 89 } 90 91 // If there is evidence this call site was already linked, set the 92 // existing linkage data into result, or throw previous exception. 93 // Return true if either action is taken, else false. 94 bool resolve_previously_linked_invokedynamic(CallInfo& result, TRAPS); 95 bool save_and_throw_indy_exc(TRAPS); 96 void resolve_newly_linked_invokedynamic(CallInfo& result, TRAPS); 97 98 // pre-bootstrap resolution actions: 99 Handle resolve_bsm(TRAPS); // lazily compute _bsm and return it 100 void resolve_bss_name_and_type(TRAPS); // lazily compute _name/_type 101 void resolve_args(TRAPS); // compute arguments 102 103 // setters for post-bootstrap results: set_resolved_value(Handle value)104 void set_resolved_value(Handle value) { 105 assert(!is_resolved() && !is_method_call(), ""); 106 _is_resolved = true; 107 _resolved_value = value; 108 } set_resolved_method(methodHandle method,Handle appendix)109 void set_resolved_method(methodHandle method, Handle appendix) { 110 assert(!is_resolved() && is_method_call(), ""); 111 _is_resolved = true; 112 _resolved_method = method; 113 _resolved_appendix = appendix; 114 } 115 print()116 void print() { print_msg_on(tty); } 117 void print_msg_on(outputStream* st, const char* msg = NULL); 118 }; 119 120 #endif // SHARE_INTERPRETER_BOOTSTRAPINFO_HPP 121