1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/constMethod.cpp Sat Sep 01 13:25:18 2012 -0400
1.3 @@ -0,0 +1,303 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "interpreter/interpreter.hpp"
1.30 +#include "memory/gcLocker.hpp"
1.31 +#include "memory/metadataFactory.hpp"
1.32 +#include "oops/constMethod.hpp"
1.33 +#include "oops/method.hpp"
1.34 +
1.35 +// Static initialization
1.36 +const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
1.37 +const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
1.38 +
1.39 +ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
1.40 + int byte_code_size,
1.41 + int compressed_line_number_size,
1.42 + int localvariable_table_length,
1.43 + int exception_table_length,
1.44 + int checked_exceptions_length,
1.45 + TRAPS) {
1.46 + int size = ConstMethod::size(byte_code_size,
1.47 + compressed_line_number_size,
1.48 + localvariable_table_length,
1.49 + exception_table_length,
1.50 + checked_exceptions_length);
1.51 + return new (loader_data, size, true, THREAD) ConstMethod(
1.52 + byte_code_size, compressed_line_number_size,
1.53 + localvariable_table_length, exception_table_length,
1.54 + checked_exceptions_length, size);
1.55 +}
1.56 +
1.57 +ConstMethod::ConstMethod(int byte_code_size,
1.58 + int compressed_line_number_size,
1.59 + int localvariable_table_length,
1.60 + int exception_table_length,
1.61 + int checked_exceptions_length,
1.62 + int size) {
1.63 +
1.64 + No_Safepoint_Verifier no_safepoint;
1.65 + set_interpreter_kind(Interpreter::invalid);
1.66 + init_fingerprint();
1.67 + set_constants(NULL);
1.68 + set_stackmap_data(NULL);
1.69 + set_code_size(byte_code_size);
1.70 + set_constMethod_size(size);
1.71 + set_inlined_tables_length(checked_exceptions_length,
1.72 + compressed_line_number_size,
1.73 + localvariable_table_length,
1.74 + exception_table_length);
1.75 + assert(this->size() == size, "wrong size for object");
1.76 +}
1.77 +
1.78 +
1.79 +// Deallocate metadata fields associated with ConstMethod*
1.80 +void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
1.81 + set_interpreter_kind(Interpreter::invalid);
1.82 + if (stackmap_data() != NULL) {
1.83 + MetadataFactory::free_array<u1>(loader_data, stackmap_data());
1.84 + }
1.85 + set_stackmap_data(NULL);
1.86 +}
1.87 +
1.88 +// How big must this constMethodObject be?
1.89 +
1.90 +int ConstMethod::size(int code_size,
1.91 + int compressed_line_number_size,
1.92 + int local_variable_table_length,
1.93 + int exception_table_length,
1.94 + int checked_exceptions_length) {
1.95 + int extra_bytes = code_size;
1.96 + if (compressed_line_number_size > 0) {
1.97 + extra_bytes += compressed_line_number_size;
1.98 + }
1.99 + if (checked_exceptions_length > 0) {
1.100 + extra_bytes += sizeof(u2);
1.101 + extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
1.102 + }
1.103 + if (local_variable_table_length > 0) {
1.104 + extra_bytes += sizeof(u2);
1.105 + extra_bytes +=
1.106 + local_variable_table_length * sizeof(LocalVariableTableElement);
1.107 + }
1.108 + if (exception_table_length > 0) {
1.109 + extra_bytes += sizeof(u2);
1.110 + extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
1.111 + }
1.112 + int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
1.113 + return align_object_size(header_size() + extra_words);
1.114 +}
1.115 +
1.116 +Method* ConstMethod::method() const {
1.117 + return InstanceKlass::cast(_constants->pool_holder())->method_with_idnum(
1.118 + _method_idnum);
1.119 + }
1.120 +
1.121 +// linenumber table - note that length is unknown until decompression,
1.122 +// see class CompressedLineNumberReadStream.
1.123 +
1.124 +u_char* ConstMethod::compressed_linenumber_table() const {
1.125 + // Located immediately following the bytecodes.
1.126 + assert(has_linenumber_table(), "called only if table is present");
1.127 + return code_end();
1.128 +}
1.129 +
1.130 +u2* ConstMethod::checked_exceptions_length_addr() const {
1.131 + // Located at the end of the constMethod.
1.132 + assert(has_checked_exceptions(), "called only if table is present");
1.133 + return last_u2_element();
1.134 +}
1.135 +
1.136 +u2* ConstMethod::exception_table_length_addr() const {
1.137 + assert(has_exception_handler(), "called only if table is present");
1.138 + if (has_checked_exceptions()) {
1.139 + // If checked_exception present, locate immediately before them.
1.140 + return (u2*) checked_exceptions_start() - 1;
1.141 + } else {
1.142 + // Else, the exception table is at the end of the constMethod.
1.143 + return last_u2_element();
1.144 + }
1.145 +}
1.146 +
1.147 +u2* ConstMethod::localvariable_table_length_addr() const {
1.148 + assert(has_localvariable_table(), "called only if table is present");
1.149 + if (has_exception_handler()) {
1.150 + // If exception_table present, locate immediately before them.
1.151 + return (u2*) exception_table_start() - 1;
1.152 + } else {
1.153 + if (has_checked_exceptions()) {
1.154 + // If checked_exception present, locate immediately before them.
1.155 + return (u2*) checked_exceptions_start() - 1;
1.156 + } else {
1.157 + // Else, the linenumber table is at the end of the constMethod.
1.158 + return last_u2_element();
1.159 + }
1.160 + }
1.161 +}
1.162 +
1.163 +
1.164 +// Update the flags to indicate the presence of these optional fields.
1.165 +void ConstMethod::set_inlined_tables_length(
1.166 + int checked_exceptions_len,
1.167 + int compressed_line_number_size,
1.168 + int localvariable_table_len,
1.169 + int exception_table_len) {
1.170 + // Must be done in the order below, otherwise length_addr accessors
1.171 + // will not work. Only set bit in header if length is positive.
1.172 + assert(_flags == 0, "Error");
1.173 + if (compressed_line_number_size > 0) {
1.174 + _flags |= _has_linenumber_table;
1.175 + }
1.176 + if (checked_exceptions_len > 0) {
1.177 + _flags |= _has_checked_exceptions;
1.178 + *(checked_exceptions_length_addr()) = checked_exceptions_len;
1.179 + }
1.180 + if (exception_table_len > 0) {
1.181 + _flags |= _has_exception_table;
1.182 + *(exception_table_length_addr()) = exception_table_len;
1.183 + }
1.184 + if (localvariable_table_len > 0) {
1.185 + _flags |= _has_localvariable_table;
1.186 + *(localvariable_table_length_addr()) = localvariable_table_len;
1.187 + }
1.188 +}
1.189 +
1.190 +
1.191 +int ConstMethod::checked_exceptions_length() const {
1.192 + return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
1.193 +}
1.194 +
1.195 +
1.196 +CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
1.197 + u2* addr = checked_exceptions_length_addr();
1.198 + u2 length = *addr;
1.199 + assert(length > 0, "should only be called if table is present");
1.200 + addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
1.201 + return (CheckedExceptionElement*) addr;
1.202 +}
1.203 +
1.204 +
1.205 +int ConstMethod::localvariable_table_length() const {
1.206 + return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
1.207 +}
1.208 +
1.209 +
1.210 +LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
1.211 + u2* addr = localvariable_table_length_addr();
1.212 + u2 length = *addr;
1.213 + assert(length > 0, "should only be called if table is present");
1.214 + addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
1.215 + return (LocalVariableTableElement*) addr;
1.216 +}
1.217 +
1.218 +int ConstMethod::exception_table_length() const {
1.219 + return has_exception_handler() ? *(exception_table_length_addr()) : 0;
1.220 +}
1.221 +
1.222 +ExceptionTableElement* ConstMethod::exception_table_start() const {
1.223 + u2* addr = exception_table_length_addr();
1.224 + u2 length = *addr;
1.225 + assert(length > 0, "should only be called if table is present");
1.226 + addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
1.227 + return (ExceptionTableElement*)addr;
1.228 +}
1.229 +
1.230 +
1.231 +// Printing
1.232 +
1.233 +void ConstMethod::print_on(outputStream* st) const {
1.234 + ResourceMark rm;
1.235 + assert(is_constMethod(), "must be constMethod");
1.236 + st->print_cr(internal_name());
1.237 + st->print(" - method: " INTPTR_FORMAT " ", (address)method());
1.238 + method()->print_value_on(st); st->cr();
1.239 + if (has_stackmap_table()) {
1.240 + st->print(" - stackmap data: ");
1.241 + stackmap_data()->print_value_on(st);
1.242 + st->cr();
1.243 + }
1.244 +}
1.245 +
1.246 +// Short version of printing ConstMethod* - just print the name of the
1.247 +// method it belongs to.
1.248 +void ConstMethod::print_value_on(outputStream* st) const {
1.249 + assert(is_constMethod(), "must be constMethod");
1.250 + st->print(" const part of method " );
1.251 + method()->print_value_on(st);
1.252 +}
1.253 +
1.254 +
1.255 +// Verification
1.256 +
1.257 +void ConstMethod::verify_on(outputStream* st) {
1.258 + guarantee(is_constMethod(), "object must be constMethod");
1.259 + guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
1.260 +
1.261 + // Verification can occur during oop construction before the method or
1.262 + // other fields have been initialized.
1.263 + guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
1.264 + guarantee(method()->is_method(), "should be method");
1.265 +
1.266 + address m_end = (address)((oop*) this + size());
1.267 + address compressed_table_start = code_end();
1.268 + guarantee(compressed_table_start <= m_end, "invalid method layout");
1.269 + address compressed_table_end = compressed_table_start;
1.270 + // Verify line number table
1.271 + if (has_linenumber_table()) {
1.272 + CompressedLineNumberReadStream stream(compressed_linenumber_table());
1.273 + while (stream.read_pair()) {
1.274 + guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
1.275 + }
1.276 + compressed_table_end += stream.position();
1.277 + }
1.278 + guarantee(compressed_table_end <= m_end, "invalid method layout");
1.279 + // Verify checked exceptions, exception table and local variable tables
1.280 + if (has_checked_exceptions()) {
1.281 + u2* addr = checked_exceptions_length_addr();
1.282 + guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
1.283 + }
1.284 + if (has_exception_handler()) {
1.285 + u2* addr = exception_table_length_addr();
1.286 + guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
1.287 + }
1.288 + if (has_localvariable_table()) {
1.289 + u2* addr = localvariable_table_length_addr();
1.290 + guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
1.291 + }
1.292 + // Check compressed_table_end relative to uncompressed_table_start
1.293 + u2* uncompressed_table_start;
1.294 + if (has_localvariable_table()) {
1.295 + uncompressed_table_start = (u2*) localvariable_table_start();
1.296 + } else if (has_exception_handler()) {
1.297 + uncompressed_table_start = (u2*) exception_table_start();
1.298 + } else if (has_checked_exceptions()) {
1.299 + uncompressed_table_start = (u2*) checked_exceptions_start();
1.300 + } else {
1.301 + uncompressed_table_start = (u2*) m_end;
1.302 + }
1.303 + int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
1.304 + int max_gap = align_object_size(1)*BytesPerWord;
1.305 + guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
1.306 +}
