diff options
Diffstat (limited to 'src/share/vm/interpreter/bytecode.hpp')
| -rw-r--r-- | src/share/vm/interpreter/bytecode.hpp | 161 |
1 files changed, 74 insertions, 87 deletions
diff --git a/src/share/vm/interpreter/bytecode.hpp b/src/share/vm/interpreter/bytecode.hpp index 2eeee5d25..dd0068926 100644 --- a/src/share/vm/interpreter/bytecode.hpp +++ b/src/share/vm/interpreter/bytecode.hpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 1997, 2010, 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 @@ -26,92 +26,100 @@ // 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; } + int byte_at (int offset) const { return *(addr_at(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; } + // 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_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)); } }; // The base class for different kinds of bytecode abstractions. // Provides the primitive operations to manipulate code relative // to an objects 'this' pointer. +// FIXME: Make this a ResourceObj, include the enclosing methodOop, and cache the opcode. class Bytecode: public ThisRelativeObj { protected: u_char byte_at(int offset) const { return *addr_at(offset); } - bool check_must_rewrite() const; + bool check_must_rewrite(Bytecodes::Code bc) 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()); } + // Warning: Use code() with caution on live bytecode streams. 4926272 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()); } + bool must_rewrite(Bytecodes::Code code) const { return Bytecodes::can_rewrite(code) && check_must_rewrite(code); } - 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); } + // Creation + inline friend Bytecode* Bytecode_at(address bcp); - int offset() const { return (two_byte_index() << 16) >> 16; } - address destination() const { return bcp() + offset(); } + // 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_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)) DEBUG_ONLY(+ constantPoolOopDesc::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; + } - // Attribute modification - void set_code(Bytecodes::Code code); + 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)); + } - // Creation - inline friend Bytecode* Bytecode_at(address bcp); + 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)); + } - 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 + // 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 (!Bytes::is_Java_byte_ordering_different() || Bytecodes::native_byte_order(bc /*, is_wide*/)); } }; inline Bytecode* Bytecode_at(address bcp) { + // Warning: Use with caution on live bytecode streams. 4926272 return (Bytecode*)bcp; } @@ -124,8 +132,8 @@ class LookupswitchPair: ThisRelativeObj { int _offset; public: - int match() const { return java_signed_word_at(0 * jintSize); } - int offset() const { return java_signed_word_at(1 * jintSize); } + int match() const { return get_Java_u4_at(0 * jintSize); } + int offset() const { return get_Java_u4_at(1 * jintSize); } }; @@ -134,8 +142,8 @@ class Bytecode_lookupswitch: public Bytecode { 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)); } + int default_offset() const { return get_Java_u4_at(aligned_offset(1 + 0*jintSize)); } + int number_of_pairs() const { return get_Java_u4_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 @@ -154,9 +162,9 @@ class Bytecode_tableswitch: public Bytecode { 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 default_offset() const { return get_Java_u4_at(aligned_offset(1 + 0*jintSize)); } + int low_key() const { return get_Java_u4_at(aligned_offset(1 + 1*jintSize)); } + int high_key() const { return get_Java_u4_at(aligned_offset(1 + 2*jintSize)); } int dest_offset_at(int i) const; int length() { return high_key()-low_key()+1; } @@ -206,7 +214,6 @@ class Bytecode_invoke: public ResourceObj { bool is_invokedynamic() const { return adjusted_invoke_code() == Bytecodes::_invokedynamic; } bool has_receiver() const { return !is_invokestatic() && !is_invokedynamic(); } - bool has_giant_index() const { return is_invokedynamic(); } bool is_valid() const { return is_invokeinterface() || is_invokevirtual() || @@ -252,26 +259,6 @@ inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) { } -// 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 { @@ -279,7 +266,7 @@ class Bytecode_checkcast: public Bytecode { void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); } // Returns index - long index() const { return java_hwrd_at(1); }; + long index() const { return get_index_u2(Bytecodes::_checkcast); }; // Creation inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp); @@ -299,7 +286,7 @@ class Bytecode_instanceof: public Bytecode { void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); } // Returns index - long index() const { return java_hwrd_at(1); }; + long index() const { return get_index_u2(Bytecodes::_instanceof); }; // Creation inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp); @@ -317,7 +304,7 @@ class Bytecode_new: public Bytecode { void verify() const { assert(java_code() == Bytecodes::_new, "check new"); } // Returns index - long index() const { return java_hwrd_at(1); }; + long index() const { return get_index_u2(Bytecodes::_new); }; // Creation inline friend Bytecode_new* Bytecode_new_at(address bcp); @@ -335,7 +322,7 @@ class Bytecode_multianewarray: public Bytecode { void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); } // Returns index - long index() const { return java_hwrd_at(1); }; + long index() const { return get_index_u2(Bytecodes::_multianewarray); }; // Creation inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp); @@ -353,7 +340,7 @@ class Bytecode_anewarray: public Bytecode { void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); } // Returns index - long index() const { return java_hwrd_at(1); }; + long index() const { return get_index_u2(Bytecodes::_anewarray); }; // Creation inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp); |