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1 /* |
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2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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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. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_INTERPRETER_BOOTSTRAPINFO_HPP |
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26 #define SHARE_INTERPRETER_BOOTSTRAPINFO_HPP |
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27 |
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28 #include "oops/constantPool.hpp" |
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29 #include "oops/instanceKlass.hpp" |
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30 |
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31 // BootstrapInfo provides condensed information from the constant pool |
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32 // necessary to invoke a bootstrap method. |
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33 class BootstrapInfo : public StackObj { |
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34 constantPoolHandle _pool; // constant pool containing the bootstrap specifier |
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35 const int _bss_index; // index of bootstrap specifier in CP (condy or indy) |
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36 const int _indy_index; // internal index of indy call site, or -1 if a condy call |
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37 const int _argc; // number of static arguments |
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38 Symbol* _name; // extracted from JVM_CONSTANT_NameAndType |
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39 Symbol* _signature; |
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40 |
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41 // pre-bootstrap resolution state: |
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42 Handle _bsm; // resolved bootstrap method |
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43 Handle _name_arg; // resolved String |
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44 Handle _type_arg; // resolved Class or MethodType |
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45 Handle _arg_values; // array of static arguments; null implies either |
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46 // uresolved or zero static arguments are specified |
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47 |
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48 // post-bootstrap resolution state: |
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49 bool _is_resolved; // set true when any of the next fields are set |
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50 Handle _resolved_value; // bind this as condy constant |
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51 methodHandle _resolved_method; // bind this as indy behavior |
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52 Handle _resolved_appendix; // extra opaque static argument for _resolved_method |
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53 |
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54 public: |
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55 BootstrapInfo(const constantPoolHandle& pool, int bss_index, int indy_index = -1); |
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56 |
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57 // accessors |
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58 const constantPoolHandle& pool() const{ return _pool; } |
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59 int bss_index() const { return _bss_index; } |
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60 int indy_index() const { return _indy_index; } |
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61 int argc() const { return _argc; } |
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62 bool is_method_call() const { return (_indy_index != -1); } |
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63 Symbol* name() const { return _name; } |
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64 Symbol* signature() const { return _signature; } |
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65 |
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66 // accessors to lazy state |
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67 Handle bsm() const { return _bsm; } |
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68 Handle name_arg() const { return _name_arg; } |
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69 Handle type_arg() const { return _type_arg; } |
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70 Handle arg_values() const { return _arg_values; } |
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71 bool is_resolved() const { return _is_resolved; } |
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72 Handle resolved_value() const { assert(!is_method_call(), ""); return _resolved_value; } |
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73 methodHandle resolved_method() const { assert(is_method_call(), ""); return _resolved_method; } |
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74 Handle resolved_appendix() const { assert(is_method_call(), ""); return _resolved_appendix; } |
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75 |
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76 // derived accessors |
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77 InstanceKlass* caller() const { return _pool->pool_holder(); } |
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78 oop caller_mirror() const { return caller()->java_mirror(); } |
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79 int decode_indy_index() const { return ConstantPool::decode_invokedynamic_index(_indy_index); } |
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80 int bsms_attr_index() const { return _pool->bootstrap_methods_attribute_index(_bss_index); } |
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81 int bsm_index() const { return _pool->bootstrap_method_ref_index_at(_bss_index); } |
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82 //int argc() is eagerly cached in _argc |
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83 int arg_index(int i) const { return _pool->bootstrap_argument_index_at(_bss_index, i); } |
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84 |
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85 // CP cache entry for call site (indy only) |
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86 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry() const { |
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87 assert(is_method_call(), ""); |
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88 return _pool->invokedynamic_cp_cache_entry_at(_indy_index); |
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89 } |
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90 |
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91 // If there is evidence this call site was already linked, set the |
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92 // existing linkage data into result, or throw previous exception. |
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93 // Return true if either action is taken, else false. |
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94 bool resolve_previously_linked_invokedynamic(CallInfo& result, TRAPS); |
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95 bool save_and_throw_indy_exc(TRAPS); |
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96 void resolve_newly_linked_invokedynamic(CallInfo& result, TRAPS); |
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97 |
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98 // pre-bootstrap resolution actions: |
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99 Handle resolve_bsm(TRAPS); // lazily compute _bsm and return it |
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100 void resolve_bss_name_and_type(TRAPS); // lazily compute _name/_type |
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101 void resolve_args(TRAPS); // compute arguments |
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102 |
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103 // setters for post-bootstrap results: |
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104 void set_resolved_value(Handle value) { |
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105 assert(!is_resolved() && !is_method_call(), ""); |
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106 _is_resolved = true; |
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107 _resolved_value = value; |
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108 } |
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109 void set_resolved_method(methodHandle method, Handle appendix) { |
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110 assert(!is_resolved() && is_method_call(), ""); |
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111 _is_resolved = true; |
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112 _resolved_method = method; |
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113 _resolved_appendix = appendix; |
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114 } |
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115 |
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116 void print() { print_msg_on(tty); } |
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117 void print_msg_on(outputStream* st, const char* msg = NULL); |
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118 }; |
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119 |
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120 #endif // SHARE_INTERPRETER_BOOTSTRAPINFO_HPP |