--- /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