diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/interpreter/bytecode.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/interpreter/bytecode.hpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,343 @@ +/* + * Copyright (c) 1997, 2017, 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. + * + */ + +#ifndef SHARE_VM_INTERPRETER_BYTECODE_HPP +#define SHARE_VM_INTERPRETER_BYTECODE_HPP + +#include "interpreter/bytecodes.hpp" +#include "memory/allocation.hpp" +#include "oops/method.hpp" +#include "utilities/align.hpp" +#include "utilities/bytes.hpp" + +class ciBytecodeStream; + +// The base class for different kinds of bytecode abstractions. +// Provides the primitive operations to manipulate code relative +// to the bcp. + +class Bytecode: public StackObj { + protected: + const address _bcp; + const Bytecodes::Code _code; + + // Address computation + address addr_at (int offset) const { return (address)_bcp + offset; } + u_char byte_at(int offset) const { return *addr_at(offset); } + address aligned_addr_at (int offset) const { return align_up(addr_at(offset), jintSize); } + + // Word access: + int get_Java_u2_at (int offset) const { return Bytes::get_Java_u2(addr_at(offset)); } + int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); } + int get_aligned_Java_u4_at(int offset) const { return Bytes::get_Java_u4(aligned_addr_at(offset)); } + int get_native_u2_at (int offset) const { return Bytes::get_native_u2(addr_at(offset)); } + int get_native_u4_at (int offset) const { return Bytes::get_native_u4(addr_at(offset)); } + + public: + Bytecode(Method* method, address bcp): _bcp(bcp), _code(Bytecodes::code_at(method, addr_at(0))) { + assert(method != NULL, "this form requires a valid Method*"); + } + // Defined in ciStreams.hpp + inline Bytecode(const ciBytecodeStream* stream, address bcp = NULL); + + // Attributes + address bcp() const { return _bcp; } + int instruction_size() const { return Bytecodes::length_for_code_at(_code, bcp()); } + + Bytecodes::Code code() const { return _code; } + Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); } + Bytecodes::Code invoke_code() const { return (code() == Bytecodes::_invokehandle) ? code() : java_code(); } + + // Static functions for parsing bytecodes in place. + int get_index_u1(Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_index_size(1, bc); + return *(jubyte*)addr_at(1); + } + int get_index_u2(Bytecodes::Code bc, bool is_wide = false) const { + assert_same_format_as(bc, is_wide); assert_index_size(2, bc, is_wide); + address p = addr_at(is_wide ? 2 : 1); + if (can_use_native_byte_order(bc, is_wide)) + return Bytes::get_native_u2(p); + else return Bytes::get_Java_u2(p); + } + int get_index_u1_cpcache(Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_index_size(1, bc); + return *(jubyte*)addr_at(1) + ConstantPool::CPCACHE_INDEX_TAG; + } + int get_index_u2_cpcache(Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_index_size(2, bc); assert_native_index(bc); + return Bytes::get_native_u2(addr_at(1)) + ConstantPool::CPCACHE_INDEX_TAG; + } + int get_index_u4(Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_index_size(4, bc); + assert(can_use_native_byte_order(bc), ""); + return Bytes::get_native_u4(addr_at(1)); + } + bool has_index_u4(Bytecodes::Code bc) const { + return bc == Bytecodes::_invokedynamic; + } + + int get_offset_s2(Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_offset_size(2, bc); + return (jshort) Bytes::get_Java_u2(addr_at(1)); + } + int get_offset_s4(Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_offset_size(4, bc); + return (jint) Bytes::get_Java_u4(addr_at(1)); + } + + int get_constant_u1(int offset, Bytecodes::Code bc) const { + assert_same_format_as(bc); assert_constant_size(1, offset, bc); + return *(jbyte*)addr_at(offset); + } + int get_constant_u2(int offset, Bytecodes::Code bc, bool is_wide = false) const { + assert_same_format_as(bc, is_wide); assert_constant_size(2, offset, bc, is_wide); + return (jshort) Bytes::get_Java_u2(addr_at(offset)); + } + + // These are used locally and also from bytecode streams. + void assert_same_format_as(Bytecodes::Code testbc, bool is_wide = false) const NOT_DEBUG_RETURN; + static void assert_index_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN; + static void assert_offset_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN; + static void assert_constant_size(int required_size, int where, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN; + static void assert_native_index(Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN; + static bool can_use_native_byte_order(Bytecodes::Code bc, bool is_wide = false) { + return (!Endian::is_Java_byte_ordering_different() || Bytecodes::native_byte_order(bc /*, is_wide*/)); + } +}; + + +// Abstractions for lookupswitch bytecode +class LookupswitchPair VALUE_OBJ_CLASS_SPEC { + private: + const address _bcp; + + address addr_at (int offset) const { return _bcp + offset; } + int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); } + + public: + LookupswitchPair(address bcp): _bcp(bcp) {} + int match() const { return get_Java_u4_at(0 * jintSize); } + int offset() const { return get_Java_u4_at(1 * jintSize); } +}; + + +class Bytecode_lookupswitch: public Bytecode { + public: + Bytecode_lookupswitch(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + // Defined in ciStreams.hpp + inline Bytecode_lookupswitch(const ciBytecodeStream* stream); + void verify() const PRODUCT_RETURN; + + // Attributes + int default_offset() const { return get_aligned_Java_u4_at(1 + 0*jintSize); } + int number_of_pairs() const { return get_aligned_Java_u4_at(1 + 1*jintSize); } + LookupswitchPair pair_at(int i) const { + assert(0 <= i && i < number_of_pairs(), "pair index out of bounds"); + return LookupswitchPair(aligned_addr_at(1 + (1 + i)*2*jintSize)); + } +}; + +class Bytecode_tableswitch: public Bytecode { + public: + Bytecode_tableswitch(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + // Defined in ciStreams.hpp + inline Bytecode_tableswitch(const ciBytecodeStream* stream); + void verify() const PRODUCT_RETURN; + + // Attributes + int default_offset() const { return get_aligned_Java_u4_at(1 + 0*jintSize); } + int low_key() const { return get_aligned_Java_u4_at(1 + 1*jintSize); } + int high_key() const { return get_aligned_Java_u4_at(1 + 2*jintSize); } + int dest_offset_at(int i) const; + int length() { return high_key()-low_key()+1; } +}; + +// Common code for decoding invokes and field references. + +class Bytecode_member_ref: public Bytecode { + protected: + const Method* _method; // method containing the bytecode + + Bytecode_member_ref(const methodHandle& method, int bci) : Bytecode(method(), method()->bcp_from(bci)), _method(method()) {} + + const Method* method() const { return _method; } + ConstantPool* constants() const { return _method->constants(); } + ConstantPoolCache* cpcache() const { return _method->constants()->cache(); } + ConstantPoolCacheEntry* cpcache_entry() const; + + public: + int index() const; // cache index (loaded from instruction) + int pool_index() const; // constant pool index + Symbol* klass() const; // returns the klass of the method or field + Symbol* name() const; // returns the name of the method or field + Symbol* signature() const; // returns the signature of the method or field + + BasicType result_type() const; // returns the result type of the getfield or invoke +}; + +// Abstraction for invoke_{virtual, static, interface, special} + +class Bytecode_invoke: public Bytecode_member_ref { + protected: + // Constructor that skips verification + Bytecode_invoke(const methodHandle& method, int bci, bool unused) : Bytecode_member_ref(method, bci) {} + + public: + Bytecode_invoke(const methodHandle& method, int bci) : Bytecode_member_ref(method, bci) { verify(); } + void verify() const; + + // Attributes + methodHandle static_target(TRAPS); // "specified" method (from constant pool) + Handle appendix(TRAPS); // if CPCE::has_appendix (from constant pool) + + // Testers + bool is_invokeinterface() const { return invoke_code() == Bytecodes::_invokeinterface; } + bool is_invokevirtual() const { return invoke_code() == Bytecodes::_invokevirtual; } + bool is_invokestatic() const { return invoke_code() == Bytecodes::_invokestatic; } + bool is_invokespecial() const { return invoke_code() == Bytecodes::_invokespecial; } + bool is_invokedynamic() const { return invoke_code() == Bytecodes::_invokedynamic; } + bool is_invokehandle() const { return invoke_code() == Bytecodes::_invokehandle; } + + bool has_receiver() const { return !is_invokestatic() && !is_invokedynamic(); } + + bool is_valid() const { return is_invokeinterface() || + is_invokevirtual() || + is_invokestatic() || + is_invokespecial() || + is_invokedynamic() || + is_invokehandle(); } + + bool has_appendix() { return cpcache_entry()->has_appendix(); } + + private: + // Helper to skip verification. Used is_valid() to check if the result is really an invoke + inline friend Bytecode_invoke Bytecode_invoke_check(const methodHandle& method, int bci); +}; + +inline Bytecode_invoke Bytecode_invoke_check(const methodHandle& method, int bci) { + return Bytecode_invoke(method, bci, false); +} + + +// Abstraction for all field accesses (put/get field/static) +class Bytecode_field: public Bytecode_member_ref { + public: + Bytecode_field(const methodHandle& method, int bci) : Bytecode_member_ref(method, bci) { verify(); } + + // Testers + bool is_getfield() const { return java_code() == Bytecodes::_getfield; } + bool is_putfield() const { return java_code() == Bytecodes::_putfield; } + bool is_getstatic() const { return java_code() == Bytecodes::_getstatic; } + bool is_putstatic() const { return java_code() == Bytecodes::_putstatic; } + + bool is_getter() const { return is_getfield() || is_getstatic(); } + bool is_static() const { return is_getstatic() || is_putstatic(); } + + bool is_valid() const { return is_getfield() || + is_putfield() || + is_getstatic() || + is_putstatic(); } + void verify() const; +}; + +// Abstraction for checkcast +class Bytecode_checkcast: public Bytecode { + public: + Bytecode_checkcast(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); } + + // Returns index + long index() const { return get_index_u2(Bytecodes::_checkcast); }; +}; + +// Abstraction for instanceof +class Bytecode_instanceof: public Bytecode { + public: + Bytecode_instanceof(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); } + + // Returns index + long index() const { return get_index_u2(Bytecodes::_instanceof); }; +}; + +class Bytecode_new: public Bytecode { + public: + Bytecode_new(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + void verify() const { assert(java_code() == Bytecodes::_new, "check new"); } + + // Returns index + long index() const { return get_index_u2(Bytecodes::_new); }; +}; + +class Bytecode_multianewarray: public Bytecode { + public: + Bytecode_multianewarray(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); } + + // Returns index + long index() const { return get_index_u2(Bytecodes::_multianewarray); }; +}; + +class Bytecode_anewarray: public Bytecode { + public: + Bytecode_anewarray(Method* method, address bcp): Bytecode(method, bcp) { verify(); } + void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); } + + // Returns index + long index() const { return get_index_u2(Bytecodes::_anewarray); }; +}; + +// Abstraction for ldc, ldc_w and ldc2_w +class Bytecode_loadconstant: public Bytecode { + private: + const Method* _method; + + int raw_index() const; + + public: + Bytecode_loadconstant(const methodHandle& method, int bci): Bytecode(method(), method->bcp_from(bci)), _method(method()) { verify(); } + + void verify() const { + assert(_method != NULL, "must supply method"); + Bytecodes::Code stdc = Bytecodes::java_code(code()); + assert(stdc == Bytecodes::_ldc || + stdc == Bytecodes::_ldc_w || + stdc == Bytecodes::_ldc2_w, "load constant"); + } + + // Only non-standard bytecodes (fast_aldc) have reference cache indexes. + bool has_cache_index() const { return code() >= Bytecodes::number_of_java_codes; } + + int pool_index() const; // index into constant pool + int cache_index() const { // index into reference cache (or -1 if none) + return has_cache_index() ? raw_index() : -1; + } + + BasicType result_type() const; // returns the result type of the ldc + + oop resolve_constant(TRAPS) const; +}; + +#endif // SHARE_VM_INTERPRETER_BYTECODE_HPP