author | jrose |
Wed, 09 Jun 2010 18:50:45 -0700 | |
changeset 5882 | 6b2aecc4f7d8 |
parent 5702 | 201c5cde25bb |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2010, 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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#include "incls/_precompiled.incl" |
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#include "incls/_bytecode.cpp.incl" |
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// Implementation of Bytecode |
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bool Bytecode::check_must_rewrite(Bytecodes::Code code) const { |
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assert(Bytecodes::can_rewrite(code), "post-check only"); |
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// Some codes are conditionally rewriting. Look closely at them. |
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switch (code) { |
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case Bytecodes::_aload_0: |
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// Even if RewriteFrequentPairs is turned on, |
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// the _aload_0 code might delay its rewrite until |
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// a following _getfield rewrites itself. |
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return false; |
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case Bytecodes::_lookupswitch: |
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return false; // the rewrite is not done by the interpreter |
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case Bytecodes::_new: |
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// (Could actually look at the class here, but the profit would be small.) |
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return false; // the rewrite is not always done |
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} |
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// No other special cases. |
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return true; |
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} |
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#ifdef ASSERT |
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void Bytecode::assert_same_format_as(Bytecodes::Code testbc, bool is_wide) const { |
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Bytecodes::Code thisbc = Bytecodes::cast(byte_at(0)); |
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if (thisbc == Bytecodes::_breakpoint) return; // let the assertion fail silently |
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if (is_wide) { |
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assert(thisbc == Bytecodes::_wide, "expected a wide instruction"); |
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thisbc = Bytecodes::cast(byte_at(1)); |
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if (thisbc == Bytecodes::_breakpoint) return; |
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} |
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int thisflags = Bytecodes::flags(testbc, is_wide) & Bytecodes::_all_fmt_bits; |
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int testflags = Bytecodes::flags(thisbc, is_wide) & Bytecodes::_all_fmt_bits; |
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if (thisflags != testflags) |
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tty->print_cr("assert_same_format_as(%d) failed on bc=%d%s; %d != %d", |
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(int)testbc, (int)thisbc, (is_wide?"/wide":""), testflags, thisflags); |
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assert(thisflags == testflags, "expected format"); |
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} |
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void Bytecode::assert_index_size(int size, Bytecodes::Code bc, bool is_wide) { |
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int have_fmt = (Bytecodes::flags(bc, is_wide) |
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& (Bytecodes::_fmt_has_u2 | Bytecodes::_fmt_has_u4 | |
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Bytecodes::_fmt_not_simple | |
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// Not an offset field: |
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Bytecodes::_fmt_has_o)); |
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int need_fmt = -1; |
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switch (size) { |
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case 1: need_fmt = 0; break; |
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case 2: need_fmt = Bytecodes::_fmt_has_u2; break; |
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case 4: need_fmt = Bytecodes::_fmt_has_u4; break; |
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} |
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if (is_wide) need_fmt |= Bytecodes::_fmt_not_simple; |
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if (have_fmt != need_fmt) { |
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tty->print_cr("assert_index_size %d: bc=%d%s %d != %d", size, bc, (is_wide?"/wide":""), have_fmt, need_fmt); |
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assert(have_fmt == need_fmt, "assert_index_size"); |
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} |
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} |
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void Bytecode::assert_offset_size(int size, Bytecodes::Code bc, bool is_wide) { |
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int have_fmt = Bytecodes::flags(bc, is_wide) & Bytecodes::_all_fmt_bits; |
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int need_fmt = -1; |
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switch (size) { |
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case 2: need_fmt = Bytecodes::_fmt_bo2; break; |
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case 4: need_fmt = Bytecodes::_fmt_bo4; break; |
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} |
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if (is_wide) need_fmt |= Bytecodes::_fmt_not_simple; |
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if (have_fmt != need_fmt) { |
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tty->print_cr("assert_offset_size %d: bc=%d%s %d != %d", size, bc, (is_wide?"/wide":""), have_fmt, need_fmt); |
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assert(have_fmt == need_fmt, "assert_offset_size"); |
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} |
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} |
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void Bytecode::assert_constant_size(int size, int where, Bytecodes::Code bc, bool is_wide) { |
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int have_fmt = Bytecodes::flags(bc, is_wide) & (Bytecodes::_all_fmt_bits |
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// Ignore any 'i' field (for iinc): |
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& ~Bytecodes::_fmt_has_i); |
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int need_fmt = -1; |
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switch (size) { |
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case 1: need_fmt = Bytecodes::_fmt_bc; break; |
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case 2: need_fmt = Bytecodes::_fmt_bc | Bytecodes::_fmt_has_u2; break; |
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} |
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if (is_wide) need_fmt |= Bytecodes::_fmt_not_simple; |
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int length = is_wide ? Bytecodes::wide_length_for(bc) : Bytecodes::length_for(bc); |
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if (have_fmt != need_fmt || where + size != length) { |
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tty->print_cr("assert_constant_size %d @%d: bc=%d%s %d != %d", size, where, bc, (is_wide?"/wide":""), have_fmt, need_fmt); |
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} |
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assert(have_fmt == need_fmt, "assert_constant_size"); |
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assert(where + size == length, "assert_constant_size oob"); |
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} |
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void Bytecode::assert_native_index(Bytecodes::Code bc, bool is_wide) { |
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assert((Bytecodes::flags(bc, is_wide) & Bytecodes::_fmt_has_nbo) != 0, "native index"); |
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} |
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#endif //ASSERT |
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// Implementation of Bytecode_tableupswitch |
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int Bytecode_tableswitch::dest_offset_at(int i) const { |
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return get_Java_u4_at(aligned_offset(1 + (3 + i)*jintSize)); |
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} |
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// Implementation of Bytecode_invoke |
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void Bytecode_invoke::verify() const { |
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assert(is_valid(), "check invoke"); |
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assert(method()->constants()->cache() != NULL, "do not call this from verifier or rewriter"); |
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} |
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symbolOop Bytecode_member_ref::signature() const { |
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constantPoolOop constants = method()->constants(); |
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return constants->signature_ref_at(index()); |
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} |
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symbolOop Bytecode_member_ref::name() const { |
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constantPoolOop constants = method()->constants(); |
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return constants->name_ref_at(index()); |
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} |
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BasicType Bytecode_member_ref::result_type(Thread *thread) const { |
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symbolHandle sh(thread, signature()); |
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ResultTypeFinder rts(sh); |
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rts.iterate(); |
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return rts.type(); |
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} |
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methodHandle Bytecode_invoke::static_target(TRAPS) { |
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methodHandle m; |
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KlassHandle resolved_klass; |
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constantPoolHandle constants(THREAD, _method->constants()); |
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if (java_code() == Bytecodes::_invokedynamic) { |
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LinkResolver::resolve_dynamic_method(m, resolved_klass, constants, index(), CHECK_(methodHandle())); |
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} else if (java_code() != Bytecodes::_invokeinterface) { |
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LinkResolver::resolve_method(m, resolved_klass, constants, index(), CHECK_(methodHandle())); |
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} else { |
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LinkResolver::resolve_interface_method(m, resolved_klass, constants, index(), CHECK_(methodHandle())); |
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} |
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return m; |
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} |
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int Bytecode_member_ref::index() const { |
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// Note: Rewriter::rewrite changes the Java_u2 of an invokedynamic to a native_u4, |
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// at the same time it allocates per-call-site CP cache entries. |
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Bytecodes::Code rawc = code(); |
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Bytecode* invoke = bytecode(); |
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if (invoke->has_index_u4(rawc)) |
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return invoke->get_index_u4(rawc); |
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else |
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return invoke->get_index_u2_cpcache(rawc); |
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} |
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int Bytecode_member_ref::pool_index() const { |
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int index = this->index(); |
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DEBUG_ONLY({ |
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if (!bytecode()->has_index_u4(code())) |
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index -= constantPoolOopDesc::CPCACHE_INDEX_TAG; |
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}); |
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return _method->constants()->cache()->entry_at(index)->constant_pool_index(); |
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} |
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// Implementation of Bytecode_field |
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void Bytecode_field::verify() const { |
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assert(is_valid(), "check field"); |
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} |
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// Implementation of Bytecode_loadconstant |
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int Bytecode_loadconstant::raw_index() const { |
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Bytecode* bcp = bytecode(); |
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Bytecodes::Code rawc = bcp->code(); |
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assert(rawc != Bytecodes::_wide, "verifier prevents this"); |
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if (Bytecodes::java_code(rawc) == Bytecodes::_ldc) |
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return bcp->get_index_u1(rawc); |
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else |
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return bcp->get_index_u2(rawc, false); |
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} |
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int Bytecode_loadconstant::pool_index() const { |
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int index = raw_index(); |
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if (has_cache_index()) { |
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return _method->constants()->cache()->entry_at(index)->constant_pool_index(); |
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} |
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return index; |
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} |
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BasicType Bytecode_loadconstant::result_type() const { |
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int index = pool_index(); |
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constantTag tag = _method->constants()->tag_at(index); |
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return tag.basic_type(); |
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} |
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oop Bytecode_loadconstant::resolve_constant(TRAPS) const { |
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assert(_method.not_null(), "must supply method to resolve constant"); |
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int index = raw_index(); |
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constantPoolOop constants = _method->constants(); |
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if (has_cache_index()) { |
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return constants->resolve_cached_constant_at(index, THREAD); |
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} else { |
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return constants->resolve_constant_at(index, THREAD); |
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} |
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} |
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//------------------------------------------------------------------------------ |
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// Non-product code |
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#ifndef PRODUCT |
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void Bytecode_lookupswitch::verify() const { |
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switch (Bytecodes::java_code(code())) { |
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case Bytecodes::_lookupswitch: |
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{ int i = number_of_pairs() - 1; |
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while (i-- > 0) { |
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assert(pair_at(i)->match() < pair_at(i+1)->match(), "unsorted table entries"); |
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} |
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} |
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break; |
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default: |
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fatal("not a lookupswitch bytecode"); |
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} |
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} |
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void Bytecode_tableswitch::verify() const { |
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switch (Bytecodes::java_code(code())) { |
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case Bytecodes::_tableswitch: |
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{ int lo = low_key(); |
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int hi = high_key(); |
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assert (hi >= lo, "incorrect hi/lo values in tableswitch"); |
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int i = hi - lo - 1 ; |
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while (i-- > 0) { |
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// no special check needed |
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} |
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} |
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break; |
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default: |
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fatal("not a tableswitch bytecode"); |
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} |
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} |
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#endif |