/* * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // Base class for different kinds of abstractions working // relative to an objects 'this' pointer. class ThisRelativeObj VALUE_OBJ_CLASS_SPEC { private: int sign_extend (int x, int size) const { const int s = (BytesPerInt - size)*BitsPerByte; return (x << s) >> s; } public: // Address computation address addr_at (int offset) const { return (address)this + offset; } address aligned_addr_at (int offset) const { return (address)round_to((intptr_t)addr_at(offset), jintSize); } int aligned_offset (int offset) const { return aligned_addr_at(offset) - addr_at(0); } // Java unsigned accessors (using Java spec byte ordering) int java_byte_at (int offset) const { return *(jubyte*)addr_at(offset); } int java_hwrd_at (int offset) const { return java_byte_at(offset) << (1 * BitsPerByte) | java_byte_at(offset + 1); } int java_word_at (int offset) const { return java_hwrd_at(offset) << (2 * BitsPerByte) | java_hwrd_at(offset + 2); } // Java signed accessors (using Java spec byte ordering) int java_signed_byte_at(int offset) const { return sign_extend(java_byte_at(offset), 1); } int java_signed_hwrd_at(int offset) const { return sign_extend(java_hwrd_at(offset), 2); } int java_signed_word_at(int offset) const { return java_word_at(offset) ; } // Fast accessors (using the machine's natural byte ordering) int fast_byte_at (int offset) const { return *(jubyte *)addr_at(offset); } int fast_hwrd_at (int offset) const { return *(jushort*)addr_at(offset); } int fast_word_at (int offset) const { return *(juint *)addr_at(offset); } // Fast signed accessors (using the machine's natural byte ordering) int fast_signed_byte_at(int offset) const { return *(jbyte *)addr_at(offset); } int fast_signed_hwrd_at(int offset) const { return *(jshort*)addr_at(offset); } int fast_signed_word_at(int offset) const { return *(jint *)addr_at(offset); } // Fast manipulators (using the machine's natural byte ordering) void set_fast_byte_at (int offset, int x) const { *(jbyte *)addr_at(offset) = (jbyte )x; } void set_fast_hwrd_at (int offset, int x) const { *(jshort*)addr_at(offset) = (jshort)x; } void set_fast_word_at (int offset, int x) const { *(jint *)addr_at(offset) = (jint )x; } }; // The base class for different kinds of bytecode abstractions. // Provides the primitive operations to manipulate code relative // to an objects 'this' pointer. class Bytecode: public ThisRelativeObj { protected: u_char byte_at(int offset) const { return *addr_at(offset); } bool check_must_rewrite() const; public: // Attributes address bcp() const { return addr_at(0); } address next_bcp() const { return addr_at(0) + Bytecodes::length_at(bcp()); } int instruction_size() const { return Bytecodes::length_at(bcp()); } Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); } Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); } bool must_rewrite() const { return Bytecodes::can_rewrite(code()) && check_must_rewrite(); } bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } int one_byte_index() const { assert_index_size(1); return byte_at(1); } int two_byte_index() const { assert_index_size(2); return (byte_at(1) << 8) + byte_at(2); } int offset() const { return (two_byte_index() << 16) >> 16; } address destination() const { return bcp() + offset(); } // Attribute modification void set_code(Bytecodes::Code code); // Creation inline friend Bytecode* Bytecode_at(address bcp); private: void assert_index_size(int required_size) const { #ifdef ASSERT int isize = instruction_size() - 1; if (isize == 2 && code() == Bytecodes::_iinc) isize = 1; else if (isize <= 2) ; // no change else if (code() == Bytecodes::_invokedynamic) isize = 4; else isize = 2; assert(isize = required_size, "wrong index size"); #endif } }; inline Bytecode* Bytecode_at(address bcp) { return (Bytecode*)bcp; } // Abstractions for lookupswitch bytecode class LookupswitchPair: ThisRelativeObj { private: int _match; int _offset; public: int match() const { return java_signed_word_at(0 * jintSize); } int offset() const { return java_signed_word_at(1 * jintSize); } }; class Bytecode_lookupswitch: public Bytecode { public: void verify() const PRODUCT_RETURN; // Attributes int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); } int number_of_pairs() const { return java_signed_word_at(aligned_offset(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); } // Creation inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp); }; inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) { Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp; debug_only(b->verify()); return b; } class Bytecode_tableswitch: public Bytecode { public: void verify() const PRODUCT_RETURN; // Attributes int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); } int low_key() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); } int high_key() const { return java_signed_word_at(aligned_offset(1 + 2*jintSize)); } int dest_offset_at(int i) const; int length() { return high_key()-low_key()+1; } // Creation inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp); }; inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) { Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp; debug_only(b->verify()); return b; } // Abstraction for invoke_{virtual, static, interface, special} class Bytecode_invoke: public ResourceObj { protected: methodHandle _method; // method containing the bytecode int _bci; // position of the bytecode Bytecode_invoke(methodHandle method, int bci) : _method(method), _bci(bci) {} public: void verify() const; // Attributes methodHandle method() const { return _method; } int bci() const { return _bci; } address bcp() const { return _method->bcp_from(bci()); } int index() const; // the constant pool index for the invoke symbolOop name() const; // returns the name of the invoked method symbolOop signature() const; // returns the signature of the invoked method BasicType result_type(Thread *thread) const; // returns the result type of the invoke Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); } Bytecodes::Code adjusted_invoke_code() const { return Bytecodes::java_code(code()); } methodHandle static_target(TRAPS); // "specified" method (from constant pool) // Testers bool is_invokeinterface() const { return adjusted_invoke_code() == Bytecodes::_invokeinterface; } bool is_invokevirtual() const { return adjusted_invoke_code() == Bytecodes::_invokevirtual; } bool is_invokestatic() const { return adjusted_invoke_code() == Bytecodes::_invokestatic; } bool is_invokespecial() const { return adjusted_invoke_code() == Bytecodes::_invokespecial; } bool is_invokedynamic() const { return adjusted_invoke_code() == Bytecodes::_invokedynamic; } bool has_giant_index() const { return is_invokedynamic(); } bool is_valid() const { return is_invokeinterface() || is_invokevirtual() || is_invokestatic() || is_invokespecial() || is_invokedynamic(); } // Creation inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci); // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke. inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci); }; inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) { Bytecode_invoke* b = new Bytecode_invoke(method, bci); debug_only(b->verify()); return b; } inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) { Bytecode_invoke* b = new Bytecode_invoke(method, bci); return b->is_valid() ? b : NULL; } // Abstraction for all field accesses (put/get field/static_ class Bytecode_field: public Bytecode { public: void verify() const; int index() const; bool is_static() const; // Creation inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp); }; inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) { Bytecode_field* b = (Bytecode_field*)bcp; debug_only(b->verify()); return b; } // Abstraction for {get,put}static class Bytecode_static: public Bytecode { public: void verify() const; // Returns the result type of the send by inspecting the field ref BasicType result_type(methodOop method) const; // Creation inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp); }; inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) { Bytecode_static* b = (Bytecode_static*)bcp; debug_only(b->verify()); return b; } // Abstraction for checkcast class Bytecode_checkcast: public Bytecode { public: void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); } // Returns index long index() const { return java_hwrd_at(1); }; // Creation inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp); }; inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) { Bytecode_checkcast* b = (Bytecode_checkcast*)bcp; debug_only(b->verify()); return b; } // Abstraction for instanceof class Bytecode_instanceof: public Bytecode { public: void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); } // Returns index long index() const { return java_hwrd_at(1); }; // Creation inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp); }; inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) { Bytecode_instanceof* b = (Bytecode_instanceof*)bcp; debug_only(b->verify()); return b; } class Bytecode_new: public Bytecode { public: void verify() const { assert(java_code() == Bytecodes::_new, "check new"); } // Returns index long index() const { return java_hwrd_at(1); }; // Creation inline friend Bytecode_new* Bytecode_new_at(address bcp); }; inline Bytecode_new* Bytecode_new_at(address bcp) { Bytecode_new* b = (Bytecode_new*)bcp; debug_only(b->verify()); return b; } class Bytecode_multianewarray: public Bytecode { public: void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); } // Returns index long index() const { return java_hwrd_at(1); }; // Creation inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp); }; inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) { Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp; debug_only(b->verify()); return b; } class Bytecode_anewarray: public Bytecode { public: void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); } // Returns index long index() const { return java_hwrd_at(1); }; // Creation inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp); }; inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) { Bytecode_anewarray* b = (Bytecode_anewarray*)bcp; debug_only(b->verify()); return b; } // Abstraction for ldc, ldc_w and ldc2_w class Bytecode_loadconstant: public Bytecode { public: void verify() const { Bytecodes::Code stdc = Bytecodes::java_code(code()); assert(stdc == Bytecodes::_ldc || stdc == Bytecodes::_ldc_w || stdc == Bytecodes::_ldc2_w, "load constant"); } int index() const; inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp); }; inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) { Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp; debug_only(b->verify()); return b; }