diff options
Diffstat (limited to 'src/share/vm/interpreter/bytecodeStream.hpp')
| -rw-r--r-- | src/share/vm/interpreter/bytecodeStream.hpp | 146 |
1 files changed, 84 insertions, 62 deletions
diff --git a/src/share/vm/interpreter/bytecodeStream.hpp b/src/share/vm/interpreter/bytecodeStream.hpp index 6561c225c..204a3c56a 100644 --- a/src/share/vm/interpreter/bytecodeStream.hpp +++ b/src/share/vm/interpreter/bytecodeStream.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 @@ -32,13 +32,13 @@ // while ((c = s.next()) >= 0) { // ... // } -// + // A RawBytecodeStream is a simple version of BytecodeStream. // It is used ONLY when we know the bytecodes haven't been rewritten -// yet, such as in the rewriter or the verifier. Currently only the -// verifier uses this class. +// yet, such as in the rewriter or the verifier. -class RawBytecodeStream: StackObj { +// Here is the common base class for both RawBytecodeStream and BytecodeStream: +class BaseBytecodeStream: StackObj { protected: // stream buffer methodHandle _method; // read from method directly @@ -49,15 +49,17 @@ class RawBytecodeStream: StackObj { int _end_bci; // bci after the current iteration interval // last bytecode read - Bytecodes::Code _code; + Bytecodes::Code _raw_code; bool _is_wide; + bool _is_raw; // false in 'cooked' BytecodeStream - public: // Construction - RawBytecodeStream(methodHandle method) : _method(method) { + BaseBytecodeStream(methodHandle method) : _method(method) { set_interval(0, _method->code_size()); + _is_raw = false; } + public: // Iteration control void set_interval(int beg_bci, int end_bci) { // iterate over the interval [beg_bci, end_bci) @@ -72,6 +74,46 @@ class RawBytecodeStream: StackObj { set_interval(beg_bci, _method->code_size()); } + bool is_raw() const { return _is_raw; } + + // Stream attributes + methodHandle method() const { return _method; } + + int bci() const { return _bci; } + int next_bci() const { return _next_bci; } + int end_bci() const { return _end_bci; } + + Bytecodes::Code raw_code() const { return _raw_code; } + bool is_wide() const { return _is_wide; } + int instruction_size() const { return (_next_bci - _bci); } + bool is_last_bytecode() const { return _next_bci >= _end_bci; } + + address bcp() const { return method()->code_base() + _bci; } + Bytecode* bytecode() const { return Bytecode_at(bcp()); } + + // State changes + void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } + + // Bytecode-specific attributes + int dest() const { return bci() + bytecode()->get_offset_s2(raw_code()); } + int dest_w() const { return bci() + bytecode()->get_offset_s4(raw_code()); } + + // One-byte indices. + int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); } + + protected: + void assert_raw_index_size(int size) const NOT_DEBUG_RETURN; + void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN; +}; + +class RawBytecodeStream: public BaseBytecodeStream { + public: + // Construction + RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) { + _is_raw = true; + } + + public: // Iteration // Use raw_next() rather than next() for faster method reference Bytecodes::Code raw_next() { @@ -80,7 +122,7 @@ class RawBytecodeStream: StackObj { _bci = _next_bci; assert(!is_last_bytecode(), "caller should check is_last_bytecode()"); - address bcp = RawBytecodeStream::bcp(); + address bcp = this->bcp(); code = Bytecodes::code_or_bp_at(bcp); // set next bytecode position @@ -90,84 +132,49 @@ class RawBytecodeStream: StackObj { && code != Bytecodes::_lookupswitch, "can't be special bytecode"); _is_wide = false; _next_bci += l; - _code = code; + _raw_code = code; return code; - } else if (code == Bytecodes::_wide && _bci + 1 >= _end_bci) { - return Bytecodes::_illegal; } else { return raw_next_special(code); } } Bytecodes::Code raw_next_special(Bytecodes::Code code); - // Stream attributes - methodHandle method() const { return _method; } - - int bci() const { return _bci; } - int next_bci() const { return _next_bci; } - int end_bci() const { return _end_bci; } - - Bytecodes::Code code() const { return _code; } - bool is_wide() const { return _is_wide; } - int instruction_size() const { return (_next_bci - _bci); } - bool is_last_bytecode() const { return _next_bci >= _end_bci; } - - address bcp() const { return method()->code_base() + _bci; } - address next_bcp() { return method()->code_base() + _next_bci; } - - // State changes - void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } - - // Bytecode-specific attributes - int dest() const { return bci() + (short)Bytes::get_Java_u2(bcp() + 1); } - int dest_w() const { return bci() + (int )Bytes::get_Java_u4(bcp() + 1); } - - // Unsigned indices, widening - int get_index() const { assert_index_size(is_wide() ? 2 : 1); - return (is_wide()) ? Bytes::get_Java_u2(bcp() + 2) : bcp()[1]; } - int get_index_big() const { assert_index_size(2); - return (int)Bytes::get_Java_u2(bcp() + 1); } - int get_index_int() const { return has_giant_index() ? get_index_giant() : get_index_big(); } - int get_index_giant() const { assert_index_size(4); return Bytes::get_native_u4(bcp() + 1); } - int has_giant_index() const { return (code() == Bytecodes::_invokedynamic); } + // Unsigned indices, widening, with no swapping of bytes + int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); } + // Get an unsigned 2-byte index, with no swapping of bytes. + int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); } private: - void assert_index_size(int required_size) const { -#ifdef ASSERT - int isize = instruction_size() - (int)_is_wide - 1; - if (isize == 2 && code() == Bytecodes::_iinc) - isize = 1; - else if (isize <= 2) - ; // no change - else if (has_giant_index()) - isize = 4; - else - isize = 2; - assert(isize = required_size, "wrong index size"); -#endif + int get_index_u2_raw(address p) const { + assert_raw_index_size(2); assert_raw_stream(true); + return Bytes::get_Java_u2(p); } }; // In BytecodeStream, non-java bytecodes will be translated into the // corresponding java bytecodes. -class BytecodeStream: public RawBytecodeStream { +class BytecodeStream: public BaseBytecodeStream { + Bytecodes::Code _code; + public: // Construction - BytecodeStream(methodHandle method) : RawBytecodeStream(method) { } + BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { } // Iteration Bytecodes::Code next() { - Bytecodes::Code code; + Bytecodes::Code raw_code, code; // set reading position _bci = _next_bci; if (is_last_bytecode()) { // indicate end of bytecode stream - code = Bytecodes::_illegal; + raw_code = code = Bytecodes::_illegal; } else { // get bytecode - address bcp = BytecodeStream::bcp(); - code = Bytecodes::java_code_at(bcp); + address bcp = this->bcp(); + raw_code = Bytecodes::code_at(bcp); + code = Bytecodes::java_code(raw_code); // set next bytecode position // // note that we cannot advance before having the @@ -181,14 +188,29 @@ class BytecodeStream: public RawBytecodeStream { _is_wide = false; // check for special (uncommon) cases if (code == Bytecodes::_wide) { - code = (Bytecodes::Code)bcp[1]; + raw_code = (Bytecodes::Code)bcp[1]; + code = raw_code; // wide BCs are always Java-normal _is_wide = true; } assert(Bytecodes::is_java_code(code), "sanity check"); } + _raw_code = raw_code; _code = code; return _code; } bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } + Bytecodes::Code code() const { return _code; } + + // Unsigned indices, widening + int get_index() const { return is_wide() ? bytecode()->get_index_u2(raw_code(), true) : get_index_u1(); } + // Get an unsigned 2-byte index, swapping the bytes if necessary. + int get_index_u2() const { assert_raw_stream(false); + return bytecode()->get_index_u2(raw_code(), false); } + // Get an unsigned 2-byte index in native order. + int get_index_u2_cpcache() const { assert_raw_stream(false); + return bytecode()->get_index_u2_cpcache(raw_code()); } + int get_index_u4() const { assert_raw_stream(false); + return bytecode()->get_index_u4(raw_code()); } + bool has_index_u4() const { return bytecode()->has_index_u4(raw_code()); } }; |