/* * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
// ciEnv // // This class is the top level broker for requests from the compiler // to the VM. class ciEnv : StackObj {
CI_PACKAGE_ACCESS_TO friendclass CompileBroker; friendclass Dependencies; // for get_object, during logging friendclass RecordLocation; friendclass PrepareExtraDataClosure;
private:
Arena* _arena; // Alias for _ciEnv_arena except in init_shared_objects()
Arena _ciEnv_arena;
ciObjectFactory* _factory;
OopRecorder* _oop_recorder;
DebugInformationRecorder* _debug_info;
Dependencies* _dependencies; constchar* _failure_reason; bool _inc_decompile_count_on_failure; int _compilable; bool _break_at_compile; int _num_inlined_bytecodes;
CompileTask* _task; // faster access to CompilerThread::task
CompileLog* _log; // faster access to CompilerThread::log void* _compiler_data; // compiler-specific stuff, if any
ciInstance* _the_null_string; // The Java string "null"
ciInstance* _the_min_jint_string; // The Java string "-2147483648"
// Look up a klass by name from a particular class loader (the accessor's). // If require_local, result must be defined in that class loader, or NULL. // If !require_local, a result from remote class loader may be reported, // if sufficient class loader constraints exist such that initiating // a class loading request from the given loader is bound to return // the class defined in the remote loader (or throw an error). // // Return an unloaded klass if !require_local and no class at all is found. // // The CI treats a klass as loaded if it is consistently defined in // another loader, even if it hasn't yet been loaded in all loaders // that could potentially see it via delegation.
ciKlass* get_klass_by_name(ciKlass* accessing_klass,
ciSymbol* klass_name, bool require_local);
// Constant pool access.
ciKlass* get_klass_by_index(const constantPoolHandle& cpool, int klass_index, bool& is_accessible,
ciInstanceKlass* loading_klass);
ciConstant get_constant_by_index(const constantPoolHandle& cpool, int pool_index, int cache_index,
ciInstanceKlass* accessor);
ciField* get_field_by_index(ciInstanceKlass* loading_klass, int field_index);
ciMethod* get_method_by_index(const constantPoolHandle& cpool, int method_index, Bytecodes::Code bc,
ciInstanceKlass* loading_klass);
// Implementation methods for loading and constant pool access.
ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass, const constantPoolHandle& cpool,
ciSymbol* klass_name, bool require_local);
ciKlass* get_klass_by_index_impl(const constantPoolHandle& cpool, int klass_index, bool& is_accessible,
ciInstanceKlass* loading_klass);
ciConstant get_constant_by_index_impl(const constantPoolHandle& cpool, int pool_index, int cache_index,
ciInstanceKlass* loading_klass);
ciField* get_field_by_index_impl(ciInstanceKlass* loading_klass, int field_index);
ciMethod* get_method_by_index_impl(const constantPoolHandle& cpool, int method_index, Bytecodes::Code bc,
ciInstanceKlass* loading_klass);
// Get a ciObject from the object factory. Ensures uniqueness // of ciObjects.
ciObject* get_object(oop o) { if (o == NULL) { return _null_object_instance;
} else { return _factory->get(o);
}
}
ciSymbol* get_symbol(Symbol* o) { if (o == NULL) {
ShouldNotReachHere(); return NULL;
} else { return _factory->get_symbol(o);
}
}
ciMetadata* get_metadata(Metadata* o) { if (o == NULL) { return NULL;
} else { return _factory->get_metadata(o);
}
}
// Get a ciMethod representing either an unfound method or // a method with an unloaded holder. Ensures uniqueness of // the result.
ciMethod* get_unloaded_method(ciKlass* holder,
ciSymbol* name,
ciSymbol* signature,
ciInstanceKlass* accessor) {
ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); return _factory->get_unloaded_method(declared_holder, name, signature, accessor);
}
// Get a ciKlass representing an unloaded klass. // Ensures uniqueness of the result.
ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
ciSymbol* name) { return _factory->get_unloaded_klass(accessing_klass, name, true);
}
// Get a ciKlass representing an unloaded klass mirror. // Result is not necessarily unique, but will be unloaded.
ciInstance* get_unloaded_klass_mirror(ciKlass* type) { return _factory->get_unloaded_klass_mirror(type);
}
// Get a ciInstance representing an unresolved method handle constant.
ciInstance* get_unloaded_method_handle_constant(ciKlass* holder,
ciSymbol* name,
ciSymbol* signature, int ref_kind) { return _factory->get_unloaded_method_handle_constant(holder, name, signature, ref_kind);
}
// Get a ciInstance representing an unresolved method type constant.
ciInstance* get_unloaded_method_type_constant(ciSymbol* signature) { return _factory->get_unloaded_method_type_constant(signature);
}
// See if we already have an unloaded klass for the given name // or return NULL if not.
ciKlass *check_get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) { return _factory->get_unloaded_klass(accessing_klass, name, false);
}
// Get a ciReturnAddress corresponding to the given bci. // Ensures uniqueness of the result.
ciReturnAddress* get_return_address(int bci) { return _factory->get_return_address(bci);
}
// Get a ciMethodData representing the methodData for a method // with none.
ciMethodData* get_empty_methodData() { return _factory->get_empty_methodData();
}
// General utility : get a buffer of some required length. // Used in symbol creation. char* name_buffer(int req_len);
// Is this thread currently in the VM state? staticbool is_in_vm();
// Helper routine for determining the validity of a compilation with // respect to method dependencies (e.g. concurrent class loading). void validate_compile_task_dependencies(ciMethod* target); public: enum {
MethodCompilable,
MethodCompilable_not_at_tier,
MethodCompilable_never
};
ciEnv(CompileTask* task); // Used only during initialization of the ci
ciEnv(Arena* arena);
~ciEnv();
// This is true if the compilation is not going to produce code. // (It is reasonable to retry failed compilations.) bool failing() { return _failure_reason != NULL; }
// Reason this compilation is failing, such as "too many basic blocks". constchar* failure_reason() { return _failure_reason; }
// Return state of appropriate compatibility int compilable() { return _compilable; }
constchar* retry_message() const { switch (_compilable) { case ciEnv::MethodCompilable_not_at_tier: return"retry at different tier"; case ciEnv::MethodCompilable_never: return"not retryable"; case ciEnv::MethodCompilable: return NULL; default:
ShouldNotReachHere(); return NULL;
}
}
// The compiler task which has created this env. // May be useful to find out compile_id, comp_level, etc.
CompileTask* task() { return _task; }
// Handy forwards to the task: int comp_level(); // task()->comp_level()
uint compile_id(); // task()->compile_id()
// Register the result of a compilation. void register_method(ciMethod* target, int entry_bci,
CodeOffsets* offsets, int orig_pc_offset,
CodeBuffer* code_buffer, int frame_words,
OopMapSet* oop_map_set,
ExceptionHandlerTable* handler_table,
ImplicitExceptionTable* inc_table,
AbstractCompiler* compiler, bool has_unsafe_access, bool has_wide_vectors, bool has_monitors, int immediate_oops_patched,
RTMState rtm_state = NoRTM);
// Access to certain well known ciObjects. #define VM_CLASS_FUNC(name, ignore_s) \
ciInstanceKlass* name() { \ return _##name;\
}
VM_CLASSES_DO(VM_CLASS_FUNC) #undef VM_CLASS_FUNC
// Note: To find a class from its name string, use ciSymbol::make, // but consider adding to vmSymbols.hpp instead.
// converts the ciKlass* representing the holder of a method into a // ciInstanceKlass*. This is needed since the holder of a method in // the bytecodes could be an array type. Basically this converts // array types into java/lang/Object and other types stay as they are. static ciInstanceKlass* get_instance_klass_for_declared_method_holder(ciKlass* klass);
// Access to the compile-lifetime allocation arena.
Arena* arena() { return _arena; }
// What is the current compilation environment? static ciEnv* current() { return CompilerThread::current()->env(); }
// Overload with current thread argument static ciEnv* current(CompilerThread *thread) { return thread->env(); }
// Per-compiler data. (Used by C2 to publish the Compile* pointer.) void* compiler_data() { return _compiler_data; } void set_compiler_data(void* x) { _compiler_data = x; }
// Notice that a method has been inlined in the current compile; // used only for statistics. void notice_inlined_method(ciMethod* method);
// Total number of bytecodes in inlined methods in this compile int num_inlined_bytecodes() const;
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