346 lines
15 KiB
C++
346 lines
15 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_INTERPRETER_BYTECODE_HPP
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#define SHARE_VM_INTERPRETER_BYTECODE_HPP
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#include "interpreter/bytecodes.hpp"
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#include "memory/allocation.hpp"
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#include "oops/method.hpp"
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#include "utilities/align.hpp"
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#include "utilities/bytes.hpp"
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class ciBytecodeStream;
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// The base class for different kinds of bytecode abstractions.
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// Provides the primitive operations to manipulate code relative
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// to the bcp.
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class Bytecode: public StackObj {
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protected:
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const address _bcp;
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const Bytecodes::Code _code;
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// Address computation
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address addr_at (int offset) const { return (address)_bcp + offset; }
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u_char byte_at(int offset) const { return *addr_at(offset); }
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address aligned_addr_at (int offset) const { return align_up(addr_at(offset), jintSize); }
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// Word access:
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int get_Java_u2_at (int offset) const { return Bytes::get_Java_u2(addr_at(offset)); }
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int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); }
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int get_aligned_Java_u4_at(int offset) const { return Bytes::get_Java_u4(aligned_addr_at(offset)); }
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int get_native_u2_at (int offset) const { return Bytes::get_native_u2(addr_at(offset)); }
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int get_native_u4_at (int offset) const { return Bytes::get_native_u4(addr_at(offset)); }
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public:
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Bytecode(Method* method, address bcp): _bcp(bcp), _code(Bytecodes::code_at(method, addr_at(0))) {
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assert(method != NULL, "this form requires a valid Method*");
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}
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// Defined in ciStreams.hpp
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inline Bytecode(const ciBytecodeStream* stream, address bcp = NULL);
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// Attributes
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address bcp() const { return _bcp; }
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int instruction_size() const { return Bytecodes::length_for_code_at(_code, bcp()); }
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Bytecodes::Code code() const { return _code; }
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Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
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Bytecodes::Code invoke_code() const { return (code() == Bytecodes::_invokehandle) ? code() : java_code(); }
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// Static functions for parsing bytecodes in place.
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int get_index_u1(Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_index_size(1, bc);
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return *(jubyte*)addr_at(1);
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}
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int get_index_u2(Bytecodes::Code bc, bool is_wide = false) const {
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assert_same_format_as(bc, is_wide); assert_index_size(2, bc, is_wide);
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address p = addr_at(is_wide ? 2 : 1);
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if (can_use_native_byte_order(bc, is_wide))
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return Bytes::get_native_u2(p);
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else return Bytes::get_Java_u2(p);
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}
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int get_index_u1_cpcache(Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_index_size(1, bc);
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return *(jubyte*)addr_at(1) + ConstantPool::CPCACHE_INDEX_TAG;
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}
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int get_index_u2_cpcache(Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_index_size(2, bc); assert_native_index(bc);
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return Bytes::get_native_u2(addr_at(1)) + ConstantPool::CPCACHE_INDEX_TAG;
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}
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int get_index_u4(Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_index_size(4, bc);
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assert(can_use_native_byte_order(bc), "");
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return Bytes::get_native_u4(addr_at(1));
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}
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bool has_index_u4(Bytecodes::Code bc) const {
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return bc == Bytecodes::_invokedynamic;
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}
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int get_offset_s2(Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_offset_size(2, bc);
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return (jshort) Bytes::get_Java_u2(addr_at(1));
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}
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int get_offset_s4(Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_offset_size(4, bc);
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return (jint) Bytes::get_Java_u4(addr_at(1));
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}
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int get_constant_u1(int offset, Bytecodes::Code bc) const {
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assert_same_format_as(bc); assert_constant_size(1, offset, bc);
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return *(jbyte*)addr_at(offset);
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}
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int get_constant_u2(int offset, Bytecodes::Code bc, bool is_wide = false) const {
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assert_same_format_as(bc, is_wide); assert_constant_size(2, offset, bc, is_wide);
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return (jshort) Bytes::get_Java_u2(addr_at(offset));
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}
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// These are used locally and also from bytecode streams.
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void assert_same_format_as(Bytecodes::Code testbc, bool is_wide = false) const NOT_DEBUG_RETURN;
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static void assert_index_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
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static void assert_offset_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
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static void assert_constant_size(int required_size, int where, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
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static void assert_native_index(Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
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static bool can_use_native_byte_order(Bytecodes::Code bc, bool is_wide = false) {
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return (!Endian::is_Java_byte_ordering_different() || Bytecodes::native_byte_order(bc /*, is_wide*/));
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}
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};
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// Abstractions for lookupswitch bytecode
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class LookupswitchPair {
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private:
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const address _bcp;
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address addr_at (int offset) const { return _bcp + offset; }
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int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); }
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public:
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LookupswitchPair(address bcp): _bcp(bcp) {}
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int match() const { return get_Java_u4_at(0 * jintSize); }
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int offset() const { return get_Java_u4_at(1 * jintSize); }
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};
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class Bytecode_lookupswitch: public Bytecode {
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public:
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Bytecode_lookupswitch(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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// Defined in ciStreams.hpp
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inline Bytecode_lookupswitch(const ciBytecodeStream* stream);
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void verify() const PRODUCT_RETURN;
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// Attributes
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int default_offset() const { return get_aligned_Java_u4_at(1 + 0*jintSize); }
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int number_of_pairs() const { return get_aligned_Java_u4_at(1 + 1*jintSize); }
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LookupswitchPair pair_at(int i) const {
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assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
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return LookupswitchPair(aligned_addr_at(1 + (1 + i)*2*jintSize));
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}
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};
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class Bytecode_tableswitch: public Bytecode {
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public:
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Bytecode_tableswitch(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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// Defined in ciStreams.hpp
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inline Bytecode_tableswitch(const ciBytecodeStream* stream);
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void verify() const PRODUCT_RETURN;
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// Attributes
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int default_offset() const { return get_aligned_Java_u4_at(1 + 0*jintSize); }
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int low_key() const { return get_aligned_Java_u4_at(1 + 1*jintSize); }
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int high_key() const { return get_aligned_Java_u4_at(1 + 2*jintSize); }
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int dest_offset_at(int i) const;
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int length() { return high_key()-low_key()+1; }
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};
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// Common code for decoding invokes and field references.
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class Bytecode_member_ref: public Bytecode {
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protected:
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const Method* _method; // method containing the bytecode
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Bytecode_member_ref(const methodHandle& method, int bci) : Bytecode(method(), method()->bcp_from(bci)), _method(method()) {}
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const Method* method() const { return _method; }
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ConstantPool* constants() const { return _method->constants(); }
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ConstantPoolCache* cpcache() const { return _method->constants()->cache(); }
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ConstantPoolCacheEntry* cpcache_entry() const;
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public:
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int index() const; // cache index (loaded from instruction)
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int pool_index() const; // constant pool index
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Symbol* klass() const; // returns the klass of the method or field
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Symbol* name() const; // returns the name of the method or field
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Symbol* signature() const; // returns the signature of the method or field
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BasicType result_type() const; // returns the result type of the getfield or invoke
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};
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// Abstraction for invoke_{virtual, static, interface, special, dynamic, handle}
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class Bytecode_invoke: public Bytecode_member_ref {
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protected:
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// Constructor that skips verification
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Bytecode_invoke(const methodHandle& method, int bci, bool unused) : Bytecode_member_ref(method, bci) {}
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public:
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Bytecode_invoke(const methodHandle& method, int bci) : Bytecode_member_ref(method, bci) { verify(); }
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void verify() const;
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// Attributes
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methodHandle static_target(TRAPS); // "specified" method (from constant pool)
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Handle appendix(TRAPS); // if CPCE::has_appendix (from constant pool)
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// Testers
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bool is_invokeinterface() const { return invoke_code() == Bytecodes::_invokeinterface; }
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bool is_invokevirtual() const { return invoke_code() == Bytecodes::_invokevirtual; }
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bool is_invokestatic() const { return invoke_code() == Bytecodes::_invokestatic; }
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bool is_invokespecial() const { return invoke_code() == Bytecodes::_invokespecial; }
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bool is_invokedynamic() const { return invoke_code() == Bytecodes::_invokedynamic; }
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bool is_invokehandle() const { return invoke_code() == Bytecodes::_invokehandle; }
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bool has_receiver() const { return !is_invokestatic() && !is_invokedynamic(); }
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bool is_valid() const { return is_invokeinterface() ||
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is_invokevirtual() ||
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is_invokestatic() ||
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is_invokespecial() ||
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is_invokedynamic() ||
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is_invokehandle(); }
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bool has_appendix();
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int size_of_parameters() const;
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private:
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// Helper to skip verification. Used is_valid() to check if the result is really an invoke
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inline friend Bytecode_invoke Bytecode_invoke_check(const methodHandle& method, int bci);
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};
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inline Bytecode_invoke Bytecode_invoke_check(const methodHandle& method, int bci) {
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return Bytecode_invoke(method, bci, false);
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}
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// Abstraction for all field accesses (put/get field/static)
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class Bytecode_field: public Bytecode_member_ref {
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public:
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Bytecode_field(const methodHandle& method, int bci) : Bytecode_member_ref(method, bci) { verify(); }
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// Testers
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bool is_getfield() const { return java_code() == Bytecodes::_getfield; }
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bool is_putfield() const { return java_code() == Bytecodes::_putfield; }
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bool is_getstatic() const { return java_code() == Bytecodes::_getstatic; }
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bool is_putstatic() const { return java_code() == Bytecodes::_putstatic; }
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bool is_getter() const { return is_getfield() || is_getstatic(); }
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bool is_static() const { return is_getstatic() || is_putstatic(); }
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bool is_valid() const { return is_getfield() ||
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is_putfield() ||
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is_getstatic() ||
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is_putstatic(); }
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void verify() const;
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};
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// Abstraction for checkcast
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class Bytecode_checkcast: public Bytecode {
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public:
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Bytecode_checkcast(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
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// Returns index
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long index() const { return get_index_u2(Bytecodes::_checkcast); };
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};
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// Abstraction for instanceof
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class Bytecode_instanceof: public Bytecode {
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public:
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Bytecode_instanceof(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
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// Returns index
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long index() const { return get_index_u2(Bytecodes::_instanceof); };
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};
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class Bytecode_new: public Bytecode {
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public:
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Bytecode_new(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
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// Returns index
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long index() const { return get_index_u2(Bytecodes::_new); };
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};
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class Bytecode_multianewarray: public Bytecode {
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public:
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Bytecode_multianewarray(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
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// Returns index
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long index() const { return get_index_u2(Bytecodes::_multianewarray); };
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};
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class Bytecode_anewarray: public Bytecode {
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public:
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Bytecode_anewarray(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
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void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
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// Returns index
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long index() const { return get_index_u2(Bytecodes::_anewarray); };
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};
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// Abstraction for ldc, ldc_w and ldc2_w
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class Bytecode_loadconstant: public Bytecode {
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private:
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const Method* _method;
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int raw_index() const;
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public:
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Bytecode_loadconstant(const methodHandle& method, int bci): Bytecode(method(), method->bcp_from(bci)), _method(method()) { verify(); }
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void verify() const {
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assert(_method != NULL, "must supply method");
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Bytecodes::Code stdc = Bytecodes::java_code(code());
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assert(stdc == Bytecodes::_ldc ||
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stdc == Bytecodes::_ldc_w ||
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stdc == Bytecodes::_ldc2_w, "load constant");
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}
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// Only non-standard bytecodes (fast_aldc) have reference cache indexes.
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bool has_cache_index() const { return code() >= Bytecodes::number_of_java_codes; }
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int pool_index() const; // index into constant pool
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int cache_index() const { // index into reference cache (or -1 if none)
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return has_cache_index() ? raw_index() : -1;
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}
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BasicType result_type() const; // returns the result type of the ldc
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oop resolve_constant(TRAPS) const;
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};
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#endif // SHARE_VM_INTERPRETER_BYTECODE_HPP
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