hotspot/src/share/vm/oops/constMethod.cpp - platform/libcore - Git at Google

 /*
  * 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,
                                    u2  generic_signature_index,
                                    MethodType method_type,
                                    TRAPS) {
   int size = ConstMethod::size(byte_code_size,
                                       compressed_line_number_size,
                                       localvariable_table_length,
                                       exception_table_length,
                                       checked_exceptions_length,
                                       generic_signature_index);
   return new (loader_data, size, true, THREAD) ConstMethod(
       byte_code_size, compressed_line_number_size, localvariable_table_length,
       exception_table_length, checked_exceptions_length, generic_signature_index,
       method_type, size);
 }

 ConstMethod::ConstMethod(int byte_code_size,
                          int compressed_line_number_size,
                          int localvariable_table_length,
                          int exception_table_length,
                          int checked_exceptions_length,
                          u2  generic_signature_index,
                          MethodType method_type,
                          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(generic_signature_index,
                             checked_exceptions_length,
                             compressed_line_number_size,
                             localvariable_table_length,
                             exception_table_length);
   set_method_type(method_type);
   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,
                                     u2  generic_signature_index) {
   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);
   }
   if (generic_signature_index != 0) {
     extra_bytes += sizeof(u2);
   }
   int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
   return align_object_size(header_size() + extra_words);
 }

 Method* ConstMethod::method() const {
     return _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::generic_signature_index_addr() const {
   // Located at the end of the constMethod.
   assert(has_generic_signature(), "called only if generic signature exists");
   return last_u2_element();
 }

 u2* ConstMethod::checked_exceptions_length_addr() const {
   // Located immediately before the generic signature index.
   assert(has_checked_exceptions(), "called only if table is present");
   return has_generic_signature() ? (last_u2_element() - 1) :
                                     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 or
     // immediately before the generic signature index.
     return has_generic_signature() ? (last_u2_element() - 1) :
                                       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 or
       // immediately before the generic signature index.
       return has_generic_signature() ? (last_u2_element() - 1) :
                                         last_u2_element();
     }
   }
 }

 // Update the flags to indicate the presence of these optional fields.
 void ConstMethod::set_inlined_tables_length(u2  generic_signature_index,
                                             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 (generic_signature_index != 0) {
     _flags |= _has_generic_signature;
     *(generic_signature_index_addr()) = generic_signature_index;
   }
   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");
 }
	/*
	* 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,
	u2 generic_signature_index,
	MethodType method_type,
	TRAPS) {
	int size = ConstMethod::size(byte_code_size,
	compressed_line_number_size,
	localvariable_table_length,
	exception_table_length,
	checked_exceptions_length,
	generic_signature_index);
	return new (loader_data, size, true, THREAD) ConstMethod(
	byte_code_size, compressed_line_number_size, localvariable_table_length,
	exception_table_length, checked_exceptions_length, generic_signature_index,
	method_type, size);
	}

	ConstMethod::ConstMethod(int byte_code_size,
	int compressed_line_number_size,
	int localvariable_table_length,
	int exception_table_length,
	int checked_exceptions_length,
	u2 generic_signature_index,
	MethodType method_type,
	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(generic_signature_index,
	checked_exceptions_length,
	compressed_line_number_size,
	localvariable_table_length,
	exception_table_length);
	set_method_type(method_type);
	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,
	u2 generic_signature_index) {
	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);
	}
	if (generic_signature_index != 0) {
	extra_bytes += sizeof(u2);
	}
	int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
	return align_object_size(header_size() + extra_words);
	}

	Method* ConstMethod::method() const {
	return _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::generic_signature_index_addr() const {
	// Located at the end of the constMethod.
	assert(has_generic_signature(), "called only if generic signature exists");
	return last_u2_element();
	}

	u2* ConstMethod::checked_exceptions_length_addr() const {
	// Located immediately before the generic signature index.
	assert(has_checked_exceptions(), "called only if table is present");
	return has_generic_signature() ? (last_u2_element() - 1) :
	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 or
	// immediately before the generic signature index.
	return has_generic_signature() ? (last_u2_element() - 1) :
	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 or
	// immediately before the generic signature index.
	return has_generic_signature() ? (last_u2_element() - 1) :
	last_u2_element();
	}
	}
	}

	// Update the flags to indicate the presence of these optional fields.
	void ConstMethod::set_inlined_tables_length(u2 generic_signature_index,
	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 (generic_signature_index != 0) {
	_flags \|= _has_generic_signature;
	*(generic_signature_index_addr()) = generic_signature_index;
	}
	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");
	}