--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/oops/constMethod.cpp Sat Sep 01 13:25:18 2012 -0400
@@ -0,0 +1,303 @@
+/*
+ * Copyright (c) 2003, 2012, 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "interpreter/interpreter.hpp"
+#include "memory/gcLocker.hpp"
+#include "memory/metadataFactory.hpp"
+#include "oops/constMethod.hpp"
+#include "oops/method.hpp"
+
+// Static initialization
+const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
+const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
+
+ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
+ int byte_code_size,
+ int compressed_line_number_size,
+ int localvariable_table_length,
+ int exception_table_length,
+ int checked_exceptions_length,
+ TRAPS) {
+ int size = ConstMethod::size(byte_code_size,
+ compressed_line_number_size,
+ localvariable_table_length,
+ exception_table_length,
+ checked_exceptions_length);
+ return new (loader_data, size, true, THREAD) ConstMethod(
+ byte_code_size, compressed_line_number_size,
+ localvariable_table_length, exception_table_length,
+ checked_exceptions_length, size);
+}
+
+ConstMethod::ConstMethod(int byte_code_size,
+ int compressed_line_number_size,
+ int localvariable_table_length,
+ int exception_table_length,
+ int checked_exceptions_length,
+ int size) {
+
+ No_Safepoint_Verifier no_safepoint;
+ set_interpreter_kind(Interpreter::invalid);
+ init_fingerprint();
+ set_constants(NULL);
+ set_stackmap_data(NULL);
+ set_code_size(byte_code_size);
+ set_constMethod_size(size);
+ set_inlined_tables_length(checked_exceptions_length,
+ compressed_line_number_size,
+ localvariable_table_length,
+ exception_table_length);
+ assert(this->size() == size, "wrong size for object");
+}
+
+
+// Deallocate metadata fields associated with ConstMethod*
+void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
+ set_interpreter_kind(Interpreter::invalid);
+ if (stackmap_data() != NULL) {
+ MetadataFactory::free_array<u1>(loader_data, stackmap_data());
+ }
+ set_stackmap_data(NULL);
+}
+
+// How big must this constMethodObject be?
+
+int ConstMethod::size(int code_size,
+ int compressed_line_number_size,
+ int local_variable_table_length,
+ int exception_table_length,
+ int checked_exceptions_length) {
+ int extra_bytes = code_size;
+ if (compressed_line_number_size > 0) {
+ extra_bytes += compressed_line_number_size;
+ }
+ if (checked_exceptions_length > 0) {
+ extra_bytes += sizeof(u2);
+ extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
+ }
+ if (local_variable_table_length > 0) {
+ extra_bytes += sizeof(u2);
+ extra_bytes +=
+ local_variable_table_length * sizeof(LocalVariableTableElement);
+ }
+ if (exception_table_length > 0) {
+ extra_bytes += sizeof(u2);
+ extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
+ }
+ int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
+ return align_object_size(header_size() + extra_words);
+}
+
+Method* ConstMethod::method() const {
+ return InstanceKlass::cast(_constants->pool_holder())->method_with_idnum(
+ _method_idnum);
+ }
+
+// linenumber table - note that length is unknown until decompression,
+// see class CompressedLineNumberReadStream.
+
+u_char* ConstMethod::compressed_linenumber_table() const {
+ // Located immediately following the bytecodes.
+ assert(has_linenumber_table(), "called only if table is present");
+ return code_end();
+}
+
+u2* ConstMethod::checked_exceptions_length_addr() const {
+ // Located at the end of the constMethod.
+ assert(has_checked_exceptions(), "called only if table is present");
+ return last_u2_element();
+}
+
+u2* ConstMethod::exception_table_length_addr() const {
+ assert(has_exception_handler(), "called only if table is present");
+ if (has_checked_exceptions()) {
+ // If checked_exception present, locate immediately before them.
+ return (u2*) checked_exceptions_start() - 1;
+ } else {
+ // Else, the exception table is at the end of the constMethod.
+ return last_u2_element();
+ }
+}
+
+u2* ConstMethod::localvariable_table_length_addr() const {
+ assert(has_localvariable_table(), "called only if table is present");
+ if (has_exception_handler()) {
+ // If exception_table present, locate immediately before them.
+ return (u2*) exception_table_start() - 1;
+ } else {
+ if (has_checked_exceptions()) {
+ // If checked_exception present, locate immediately before them.
+ return (u2*) checked_exceptions_start() - 1;
+ } else {
+ // Else, the linenumber table is at the end of the constMethod.
+ return last_u2_element();
+ }
+ }
+}
+
+
+// Update the flags to indicate the presence of these optional fields.
+void ConstMethod::set_inlined_tables_length(
+ int checked_exceptions_len,
+ int compressed_line_number_size,
+ int localvariable_table_len,
+ int exception_table_len) {
+ // Must be done in the order below, otherwise length_addr accessors
+ // will not work. Only set bit in header if length is positive.
+ assert(_flags == 0, "Error");
+ if (compressed_line_number_size > 0) {
+ _flags |= _has_linenumber_table;
+ }
+ if (checked_exceptions_len > 0) {
+ _flags |= _has_checked_exceptions;
+ *(checked_exceptions_length_addr()) = checked_exceptions_len;
+ }
+ if (exception_table_len > 0) {
+ _flags |= _has_exception_table;
+ *(exception_table_length_addr()) = exception_table_len;
+ }
+ if (localvariable_table_len > 0) {
+ _flags |= _has_localvariable_table;
+ *(localvariable_table_length_addr()) = localvariable_table_len;
+ }
+}
+
+
+int ConstMethod::checked_exceptions_length() const {
+ return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
+}
+
+
+CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
+ u2* addr = checked_exceptions_length_addr();
+ u2 length = *addr;
+ assert(length > 0, "should only be called if table is present");
+ addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
+ return (CheckedExceptionElement*) addr;
+}
+
+
+int ConstMethod::localvariable_table_length() const {
+ return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
+}
+
+
+LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
+ u2* addr = localvariable_table_length_addr();
+ u2 length = *addr;
+ assert(length > 0, "should only be called if table is present");
+ addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
+ return (LocalVariableTableElement*) addr;
+}
+
+int ConstMethod::exception_table_length() const {
+ return has_exception_handler() ? *(exception_table_length_addr()) : 0;
+}
+
+ExceptionTableElement* ConstMethod::exception_table_start() const {
+ u2* addr = exception_table_length_addr();
+ u2 length = *addr;
+ assert(length > 0, "should only be called if table is present");
+ addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
+ return (ExceptionTableElement*)addr;
+}
+
+
+// Printing
+
+void ConstMethod::print_on(outputStream* st) const {
+ ResourceMark rm;
+ assert(is_constMethod(), "must be constMethod");
+ st->print_cr(internal_name());
+ st->print(" - method: " INTPTR_FORMAT " ", (address)method());
+ method()->print_value_on(st); st->cr();
+ if (has_stackmap_table()) {
+ st->print(" - stackmap data: ");
+ stackmap_data()->print_value_on(st);
+ st->cr();
+ }
+}
+
+// Short version of printing ConstMethod* - just print the name of the
+// method it belongs to.
+void ConstMethod::print_value_on(outputStream* st) const {
+ assert(is_constMethod(), "must be constMethod");
+ st->print(" const part of method " );
+ method()->print_value_on(st);
+}
+
+
+// Verification
+
+void ConstMethod::verify_on(outputStream* st) {
+ guarantee(is_constMethod(), "object must be constMethod");
+ guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
+
+ // Verification can occur during oop construction before the method or
+ // other fields have been initialized.
+ guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
+ guarantee(method()->is_method(), "should be method");
+
+ address m_end = (address)((oop*) this + size());
+ address compressed_table_start = code_end();
+ guarantee(compressed_table_start <= m_end, "invalid method layout");
+ address compressed_table_end = compressed_table_start;
+ // Verify line number table
+ if (has_linenumber_table()) {
+ CompressedLineNumberReadStream stream(compressed_linenumber_table());
+ while (stream.read_pair()) {
+ guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
+ }
+ compressed_table_end += stream.position();
+ }
+ guarantee(compressed_table_end <= m_end, "invalid method layout");
+ // Verify checked exceptions, exception table and local variable tables
+ if (has_checked_exceptions()) {
+ u2* addr = checked_exceptions_length_addr();
+ guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
+ }
+ if (has_exception_handler()) {
+ u2* addr = exception_table_length_addr();
+ guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
+ }
+ if (has_localvariable_table()) {
+ u2* addr = localvariable_table_length_addr();
+ guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
+ }
+ // Check compressed_table_end relative to uncompressed_table_start
+ u2* uncompressed_table_start;
+ if (has_localvariable_table()) {
+ uncompressed_table_start = (u2*) localvariable_table_start();
+ } else if (has_exception_handler()) {
+ uncompressed_table_start = (u2*) exception_table_start();
+ } else if (has_checked_exceptions()) {
+ uncompressed_table_start = (u2*) checked_exceptions_start();
+ } else {
+ uncompressed_table_start = (u2*) m_end;
+ }
+ int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
+ int max_gap = align_object_size(1)*BytesPerWord;
+ guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
+}