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classFileParser.cpp
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classFileParser.cpp
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/*
* Copyright (c) 1997, 2021, 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 "jvm.h"
#include "aot/aotLoader.hpp"
#include "classfile/classFileParser.hpp"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/classLoadInfo.hpp"
#include "classfile/defaultMethods.hpp"
#include "classfile/dictionary.hpp"
#include "classfile/fieldLayoutBuilder.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/packageEntry.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/verificationType.hpp"
#include "classfile/verifier.hpp"
#include "classfile/vmClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/annotations.hpp"
#include "oops/constantPool.inline.hpp"
#include "oops/fieldStreams.inline.hpp"
#include "oops/instanceKlass.inline.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/klassVtable.hpp"
#include "oops/metadata.hpp"
#include "oops/method.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/recordComponent.hpp"
#include "oops/symbol.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/arguments.hpp"
#include "runtime/fieldDescriptor.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/os.hpp"
#include "runtime/perfData.hpp"
#include "runtime/reflection.hpp"
#include "runtime/safepointVerifiers.hpp"
#include "runtime/signature.hpp"
#include "runtime/timer.hpp"
#include "services/classLoadingService.hpp"
#include "services/threadService.hpp"
#include "utilities/align.hpp"
#include "utilities/bitMap.inline.hpp"
#include "utilities/copy.hpp"
#include "utilities/formatBuffer.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/growableArray.hpp"
#include "utilities/macros.hpp"
#include "utilities/ostream.hpp"
#include "utilities/resourceHash.hpp"
#include "utilities/utf8.hpp"
#if INCLUDE_CDS
#include "classfile/systemDictionaryShared.hpp"
#endif
#if INCLUDE_JFR
#include "jfr/support/jfrTraceIdExtension.hpp"
#endif
// We generally try to create the oops directly when parsing, rather than
// allocating temporary data structures and copying the bytes twice. A
// temporary area is only needed when parsing utf8 entries in the constant
// pool and when parsing line number tables.
// We add assert in debug mode when class format is not checked.
#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
#define JAVA_MIN_SUPPORTED_VERSION 45
#define JAVA_PREVIEW_MINOR_VERSION 65535
// Used for two backward compatibility reasons:
// - to check for new additions to the class file format in JDK1.5
// - to check for bug fixes in the format checker in JDK1.5
#define JAVA_1_5_VERSION 49
// Used for backward compatibility reasons:
// - to check for javac bug fixes that happened after 1.5
// - also used as the max version when running in jdk6
#define JAVA_6_VERSION 50
// Used for backward compatibility reasons:
// - to disallow argument and require ACC_STATIC for <clinit> methods
#define JAVA_7_VERSION 51
// Extension method support.
#define JAVA_8_VERSION 52
#define JAVA_9_VERSION 53
#define JAVA_10_VERSION 54
#define JAVA_11_VERSION 55
#define JAVA_12_VERSION 56
#define JAVA_13_VERSION 57
#define JAVA_14_VERSION 58
#define JAVA_15_VERSION 59
#define JAVA_16_VERSION 60
#define JAVA_17_VERSION 61
void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
assert((bad_constant == JVM_CONSTANT_Module ||
bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
"Unexpected bad constant pool entry");
if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
}
void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
ConstantPool* cp,
const int length,
TRAPS) {
assert(stream != NULL, "invariant");
assert(cp != NULL, "invariant");
// Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
// this function (_current can be allocated in a register, with scalar
// replacement of aggregates). The _current pointer is copied back to
// stream() when this function returns. DON'T call another method within
// this method that uses stream().
const ClassFileStream cfs1 = *stream;
const ClassFileStream* const cfs = &cfs1;
assert(cfs->allocated_on_stack(), "should be local");
debug_only(const u1* const old_current = stream->current();)
// Used for batching symbol allocations.
const char* names[SymbolTable::symbol_alloc_batch_size];
int lengths[SymbolTable::symbol_alloc_batch_size];
int indices[SymbolTable::symbol_alloc_batch_size];
unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
int names_count = 0;
// parsing Index 0 is unused
for (int index = 1; index < length; index++) {
// Each of the following case guarantees one more byte in the stream
// for the following tag or the access_flags following constant pool,
// so we don't need bounds-check for reading tag.
const u1 tag = cfs->get_u1_fast();
switch (tag) {
case JVM_CONSTANT_Class : {
cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
const u2 name_index = cfs->get_u2_fast();
cp->klass_index_at_put(index, name_index);
break;
}
case JVM_CONSTANT_Fieldref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->field_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_Methodref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->method_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_InterfaceMethodref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->interface_method_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_String : {
cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
const u2 string_index = cfs->get_u2_fast();
cp->string_index_at_put(index, string_index);
break;
}
case JVM_CONSTANT_MethodHandle :
case JVM_CONSTANT_MethodType: {
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, THREAD);
return;
}
if (tag == JVM_CONSTANT_MethodHandle) {
cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
const u1 ref_kind = cfs->get_u1_fast();
const u2 method_index = cfs->get_u2_fast();
cp->method_handle_index_at_put(index, ref_kind, method_index);
}
else if (tag == JVM_CONSTANT_MethodType) {
cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
const u2 signature_index = cfs->get_u2_fast();
cp->method_type_index_at_put(index, signature_index);
}
else {
ShouldNotReachHere();
}
break;
}
case JVM_CONSTANT_Dynamic : {
if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, THREAD);
return;
}
cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
const u2 bootstrap_specifier_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
_max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
}
cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
break;
}
case JVM_CONSTANT_InvokeDynamic : {
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, THREAD);
return;
}
cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
const u2 bootstrap_specifier_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
_max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
}
cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
break;
}
case JVM_CONSTANT_Integer: {
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
const u4 bytes = cfs->get_u4_fast();
cp->int_at_put(index, (jint)bytes);
break;
}
case JVM_CONSTANT_Float: {
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
const u4 bytes = cfs->get_u4_fast();
cp->float_at_put(index, *(jfloat*)&bytes);
break;
}
case JVM_CONSTANT_Long: {
// A mangled type might cause you to overrun allocated memory
guarantee_property(index + 1 < length,
"Invalid constant pool entry %u in class file %s",
index,
CHECK);
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
const u8 bytes = cfs->get_u8_fast();
cp->long_at_put(index, bytes);
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
}
case JVM_CONSTANT_Double: {
// A mangled type might cause you to overrun allocated memory
guarantee_property(index+1 < length,
"Invalid constant pool entry %u in class file %s",
index,
CHECK);
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
const u8 bytes = cfs->get_u8_fast();
cp->double_at_put(index, *(jdouble*)&bytes);
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
}
case JVM_CONSTANT_NameAndType: {
cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
const u2 name_index = cfs->get_u2_fast();
const u2 signature_index = cfs->get_u2_fast();
cp->name_and_type_at_put(index, name_index, signature_index);
break;
}
case JVM_CONSTANT_Utf8 : {
cfs->guarantee_more(2, CHECK); // utf8_length
u2 utf8_length = cfs->get_u2_fast();
const u1* utf8_buffer = cfs->current();
assert(utf8_buffer != NULL, "null utf8 buffer");
// Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
cfs->skip_u1_fast(utf8_length);
// Before storing the symbol, make sure it's legal
if (_need_verify) {
verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
}
if (has_cp_patch_at(index)) {
Handle patch = clear_cp_patch_at(index);
guarantee_property(java_lang_String::is_instance(patch()),
"Illegal utf8 patch at %d in class file %s",
index,
CHECK);
const char* const str = java_lang_String::as_utf8_string(patch());
// (could use java_lang_String::as_symbol instead, but might as well batch them)
utf8_buffer = (const u1*) str;
utf8_length = (u2) strlen(str);
}
unsigned int hash;
Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
utf8_length,
hash);
if (result == NULL) {
names[names_count] = (const char*)utf8_buffer;
lengths[names_count] = utf8_length;
indices[names_count] = index;
hashValues[names_count++] = hash;
if (names_count == SymbolTable::symbol_alloc_batch_size) {
SymbolTable::new_symbols(_loader_data,
constantPoolHandle(THREAD, cp),
names_count,
names,
lengths,
indices,
hashValues);
names_count = 0;
}
} else {
cp->symbol_at_put(index, result);
}
break;
}
case JVM_CONSTANT_Module:
case JVM_CONSTANT_Package: {
// Record that an error occurred in these two cases but keep parsing so
// that ACC_Module can be checked for in the access_flags. Need to
// throw NoClassDefFoundError in that case.
if (_major_version >= JAVA_9_VERSION) {
cfs->guarantee_more(3, CHECK);
cfs->get_u2_fast();
set_class_bad_constant_seen(tag);
break;
}
}
default: {
classfile_parse_error("Unknown constant tag %u in class file %s",
tag,
THREAD);
return;
}
} // end of switch(tag)
} // end of for
// Allocate the remaining symbols
if (names_count > 0) {
SymbolTable::new_symbols(_loader_data,
constantPoolHandle(THREAD, cp),
names_count,
names,
lengths,
indices,
hashValues);
}
// Copy _current pointer of local copy back to stream.
assert(stream->current() == old_current, "non-exclusive use of stream");
stream->set_current(cfs1.current());
}
static inline bool valid_cp_range(int index, int length) {
return (index > 0 && index < length);
}
static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
assert(cp != NULL, "invariant");
if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
return cp->symbol_at(index);
}
return NULL;
}
#ifdef ASSERT
PRAGMA_DIAG_PUSH
PRAGMA_FORMAT_NONLITERAL_IGNORED
void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
ResourceMark rm(THREAD);
fatal(msg, _class_name->as_C_string());
}
void ClassFileParser::report_assert_property_failure(const char* msg,
int index,
TRAPS) const {
ResourceMark rm(THREAD);
fatal(msg, index, _class_name->as_C_string());
}
PRAGMA_DIAG_POP
#endif
void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
ConstantPool* const cp,
const int length,
TRAPS) {
assert(cp != NULL, "invariant");
assert(stream != NULL, "invariant");
// parsing constant pool entries
parse_constant_pool_entries(stream, cp, length, CHECK);
if (class_bad_constant_seen() != 0) {
// a bad CP entry has been detected previously so stop parsing and just return.
return;
}
int index = 1; // declared outside of loops for portability
int num_klasses = 0;
// first verification pass - validate cross references
// and fixup class and string constants
for (index = 1; index < length; index++) { // Index 0 is unused
const jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_Class: {
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
}
case JVM_CONSTANT_Fieldref:
// fall through
case JVM_CONSTANT_Methodref:
// fall through
case JVM_CONSTANT_InterfaceMethodref: {
if (!_need_verify) break;
const int klass_ref_index = cp->klass_ref_index_at(index);
const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
check_property(valid_klass_reference_at(klass_ref_index),
"Invalid constant pool index %u in class file %s",
klass_ref_index, CHECK);
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
break;
}
case JVM_CONSTANT_String: {
ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
break;
}
case JVM_CONSTANT_Integer:
break;
case JVM_CONSTANT_Float:
break;
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double: {
index++;
check_property(
(index < length && cp->tag_at(index).is_invalid()),
"Improper constant pool long/double index %u in class file %s",
index, CHECK);
break;
}
case JVM_CONSTANT_NameAndType: {
if (!_need_verify) break;
const int name_ref_index = cp->name_ref_index_at(index);
const int signature_ref_index = cp->signature_ref_index_at(index);
check_property(valid_symbol_at(name_ref_index),
"Invalid constant pool index %u in class file %s",
name_ref_index, CHECK);
check_property(valid_symbol_at(signature_ref_index),
"Invalid constant pool index %u in class file %s",
signature_ref_index, CHECK);
break;
}
case JVM_CONSTANT_Utf8:
break;
case JVM_CONSTANT_UnresolvedClass: // fall-through
case JVM_CONSTANT_UnresolvedClassInError: {
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
}
case JVM_CONSTANT_ClassIndex: {
const int class_index = cp->klass_index_at(index);
check_property(valid_symbol_at(class_index),
"Invalid constant pool index %u in class file %s",
class_index, CHECK);
cp->unresolved_klass_at_put(index, class_index, num_klasses++);
break;
}
case JVM_CONSTANT_StringIndex: {
const int string_index = cp->string_index_at(index);
check_property(valid_symbol_at(string_index),
"Invalid constant pool index %u in class file %s",
string_index, CHECK);
Symbol* const sym = cp->symbol_at(string_index);
cp->unresolved_string_at_put(index, sym);
break;
}
case JVM_CONSTANT_MethodHandle: {
const int ref_index = cp->method_handle_index_at(index);
check_property(valid_cp_range(ref_index, length),
"Invalid constant pool index %u in class file %s",
ref_index, CHECK);
const constantTag tag = cp->tag_at(ref_index);
const int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_getField:
case JVM_REF_getStatic:
case JVM_REF_putField:
case JVM_REF_putStatic: {
check_property(
tag.is_field(),
"Invalid constant pool index %u in class file %s (not a field)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeVirtual:
case JVM_REF_newInvokeSpecial: {
check_property(
tag.is_method(),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial: {
check_property(
tag.is_method() ||
((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeInterface: {
check_property(
tag.is_interface_method(),
"Invalid constant pool index %u in class file %s (not an interface method)",
ref_index, CHECK);
break;
}
default: {
classfile_parse_error(
"Bad method handle kind at constant pool index %u in class file %s",
index, THREAD);
return;
}
} // switch(refkind)
// Keep the ref_index unchanged. It will be indirected at link-time.
break;
} // case MethodHandle
case JVM_CONSTANT_MethodType: {
const int ref_index = cp->method_type_index_at(index);
check_property(valid_symbol_at(ref_index),
"Invalid constant pool index %u in class file %s",
ref_index, CHECK);
break;
}
case JVM_CONSTANT_Dynamic: {
const int name_and_type_ref_index =
cp->bootstrap_name_and_type_ref_index_at(index);
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
// bootstrap specifier index must be checked later,
// when BootstrapMethods attr is available
// Mark the constant pool as having a CONSTANT_Dynamic_info structure
cp->set_has_dynamic_constant();
break;
}
case JVM_CONSTANT_InvokeDynamic: {
const int name_and_type_ref_index =
cp->bootstrap_name_and_type_ref_index_at(index);
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
// bootstrap specifier index must be checked later,
// when BootstrapMethods attr is available
break;
}
default: {
fatal("bad constant pool tag value %u", cp->tag_at(index).value());
ShouldNotReachHere();
break;
}
} // switch(tag)
} // end of for
_first_patched_klass_resolved_index = num_klasses;
cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
if (_cp_patches != NULL) {
// need to treat this_class specially...
// Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
// for now. These will be replaced with actual names of the patched classes in patch_class().
Symbol* s = vmSymbols::star_name();
for (int n=_orig_cp_size; n<cp->length(); n++) {
cp->symbol_at_put(n, s);
}
int this_class_index;
{
stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
const u1* const mark = stream->current();
stream->skip_u2_fast(1); // skip flags
this_class_index = stream->get_u2_fast();
stream->set_current(mark); // revert to mark
}
for (index = 1; index < length; index++) { // Index 0 is unused
if (has_cp_patch_at(index)) {
guarantee_property(index != this_class_index,
"Illegal constant pool patch to self at %d in class file %s",
index, CHECK);
patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
}
}
}
if (!_need_verify) {
return;
}
// second verification pass - checks the strings are of the right format.
// but not yet to the other entries
for (index = 1; index < length; index++) {
const jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_UnresolvedClass: {
const Symbol* const class_name = cp->klass_name_at(index);
// check the name, even if _cp_patches will overwrite it
verify_legal_class_name(class_name, CHECK);
break;
}
case JVM_CONSTANT_NameAndType: {
if (_need_verify) {
const int sig_index = cp->signature_ref_index_at(index);
const int name_index = cp->name_ref_index_at(index);
const Symbol* const name = cp->symbol_at(name_index);
const Symbol* const sig = cp->symbol_at(sig_index);
guarantee_property(sig->utf8_length() != 0,
"Illegal zero length constant pool entry at %d in class %s",
sig_index, CHECK);
guarantee_property(name->utf8_length() != 0,
"Illegal zero length constant pool entry at %d in class %s",
name_index, CHECK);
if (Signature::is_method(sig)) {
// Format check method name and signature
verify_legal_method_name(name, CHECK);
verify_legal_method_signature(name, sig, CHECK);
} else {
// Format check field name and signature
verify_legal_field_name(name, CHECK);
verify_legal_field_signature(name, sig, CHECK);
}
}
break;
}
case JVM_CONSTANT_Dynamic: {
const int name_and_type_ref_index =
cp->name_and_type_ref_index_at(index);
// already verified to be utf8
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
// already verified to be utf8
const int signature_ref_index =
cp->signature_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
const Symbol* const signature = cp->symbol_at(signature_ref_index);
if (_need_verify) {
// CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
// Need only to be sure signature is the right type.
if (Signature::is_method(signature)) {
throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
}
}
break;
}
case JVM_CONSTANT_InvokeDynamic:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
const int name_and_type_ref_index =
cp->name_and_type_ref_index_at(index);
// already verified to be utf8
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
// already verified to be utf8
const int signature_ref_index =
cp->signature_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
const Symbol* const signature = cp->symbol_at(signature_ref_index);
if (tag == JVM_CONSTANT_Fieldref) {
if (_need_verify) {
// Field name and signature are verified above, when iterating NameAndType_info.
// Need only to be sure signature is non-zero length and the right type.
if (Signature::is_method(signature)) {
throwIllegalSignature("Field", name, signature, CHECK);
}
}
} else {
if (_need_verify) {
// Method name and signature are verified above, when iterating NameAndType_info.
// Need only to be sure signature is non-zero length and the right type.
if (!Signature::is_method(signature)) {
throwIllegalSignature("Method", name, signature, CHECK);
}
}
// 4509014: If a class method name begins with '<', it must be "<init>"
const unsigned int name_len = name->utf8_length();
if (tag == JVM_CONSTANT_Methodref &&
name_len != 0 &&
name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, THREAD);
return;
}
}
break;
}
case JVM_CONSTANT_MethodHandle: {
const int ref_index = cp->method_handle_index_at(index);
const int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_invokeVirtual:
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial:
case JVM_REF_newInvokeSpecial: {
const int name_and_type_ref_index =
cp->name_and_type_ref_index_at(ref_index);
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
if (ref_kind == JVM_REF_newInvokeSpecial) {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad constructor name at constant pool index %u in class file %s",
name_ref_index, THREAD);
return;
}
} else {
if (name == vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, THREAD);
return;
}
}
break;
}
// Other ref_kinds are already fully checked in previous pass.
} // switch(ref_kind)
break;
}
case JVM_CONSTANT_MethodType: {
const Symbol* const no_name = vmSymbols::type_name(); // place holder
const Symbol* const signature = cp->method_type_signature_at(index);
verify_legal_method_signature(no_name, signature, CHECK);
break;
}
case JVM_CONSTANT_Utf8: {
assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
}
} // switch(tag)
} // end of for
}
Handle ClassFileParser::clear_cp_patch_at(int index) {
Handle patch = cp_patch_at(index);
_cp_patches->at_put(index, Handle());
assert(!has_cp_patch_at(index), "");
return patch;
}
void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
int name_index = _orig_cp_size + _num_patched_klasses;
int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
_num_patched_klasses ++;
}
void ClassFileParser::patch_constant_pool(ConstantPool* cp,
int index,
Handle patch,
TRAPS) {
assert(cp != NULL, "invariant");
BasicType patch_type = T_VOID;
switch (cp->tag_at(index).value()) {
case JVM_CONSTANT_UnresolvedClass: {
// Patching a class means pre-resolving it.
// The name in the constant pool is ignored.
if (java_lang_Class::is_instance(patch())) {
guarantee_property(!java_lang_Class::is_primitive(patch()),
"Illegal class patch at %d in class file %s",
index, CHECK);
Klass* k = java_lang_Class::as_Klass(patch());
patch_class(cp, index, k, k->name());
} else {
guarantee_property(java_lang_String::is_instance(patch()),
"Illegal class patch at %d in class file %s",
index, CHECK);
Symbol* const name = java_lang_String::as_symbol(patch());
patch_class(cp, index, NULL, name);
}
break;
}
case JVM_CONSTANT_String: {
// skip this patch and don't clear it. Needs the oop array for resolved
// references to be created first.
return;
}
case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
patch_prim:
{
jvalue value;
BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
guarantee_property(value_type == patch_type,
"Illegal primitive patch at %d in class file %s",
index, CHECK);
switch (value_type) {
case T_INT: cp->int_at_put(index, value.i); break;
case T_FLOAT: cp->float_at_put(index, value.f); break;
case T_LONG: cp->long_at_put(index, value.j); break;
case T_DOUBLE: cp->double_at_put(index, value.d); break;
default: assert(false, "");
}
} // end patch_prim label
break;
default: {
// %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
guarantee_property(!has_cp_patch_at(index),
"Illegal unexpected patch at %d in class file %s",
index, CHECK);
return;
}
} // end of switch(tag)
// On fall-through, mark the patch as used.
clear_cp_patch_at(index);
}
class NameSigHash: public ResourceObj {
public:
const Symbol* _name; // name
const Symbol* _sig; // signature
NameSigHash* _next; // Next entry in hash table
};
static const int HASH_ROW_SIZE = 256;
static unsigned int hash(const Symbol* name, const Symbol* sig) {
unsigned int raw_hash = 0;
raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
}
static void initialize_hashtable(NameSigHash** table) {
memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
}
// Return false if the name/sig combination is found in table.
// Return true if no duplicate is found. And name/sig is added as a new entry in table.
// The old format checker uses heap sort to find duplicates.
// NOTE: caller should guarantee that GC doesn't happen during the life cycle
// of table since we don't expect Symbol*'s to move.
static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
assert(name != NULL, "name in constant pool is NULL");
// First lookup for duplicates
int index = hash(name, sig);
NameSigHash* entry = table[index];
while (entry != NULL) {
if (entry->_name == name && entry->_sig == sig) {
return false;
}
entry = entry->_next;
}
// No duplicate is found, allocate a new entry and fill it.
entry = new NameSigHash();
entry->_name = name;
entry->_sig = sig;
// Insert into hash table
entry->_next = table[index];
table[index] = entry;
return true;
}
// Side-effects: populates the _local_interfaces field
void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
const int itfs_len,
ConstantPool* const cp,
bool* const has_nonstatic_concrete_methods,
TRAPS) {
assert(stream != NULL, "invariant");
assert(cp != NULL, "invariant");
assert(has_nonstatic_concrete_methods != NULL, "invariant");
if (itfs_len == 0) {
_local_interfaces = Universe::the_empty_instance_klass_array();
} else {
assert(itfs_len > 0, "only called for len>0");
_local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
int index;
for (index = 0; index < itfs_len; index++) {
const u2 interface_index = stream->get_u2(CHECK);
Klass* interf;
check_property(
valid_klass_reference_at(interface_index),
"Interface name has bad constant pool index %u in class file %s",
interface_index, CHECK);
if (cp->tag_at(interface_index).is_klass()) {
interf = cp->resolved_klass_at(interface_index);
} else {
Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
// Don't need to check legal name because it's checked when parsing constant pool.
// But need to make sure it's not an array type.
guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
"Bad interface name in class file %s", CHECK);
// Call resolve_super so class circularity is checked
interf = SystemDictionary::resolve_super_or_fail(
_class_name,
unresolved_klass,
Handle(THREAD, _loader_data->class_loader()),
_protection_domain,
false,
CHECK);
}
if (!interf->is_interface()) {
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
err_msg("class %s can not implement %s, because it is not an interface (%s)",
_class_name->as_klass_external_name(),
interf->external_name(),
interf->class_in_module_of_loader()));
}
if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
*has_nonstatic_concrete_methods = true;
}
_local_interfaces->at_put(index, InstanceKlass::cast(interf));
}
if (!_need_verify || itfs_len <= 1) {
return;
}
// Check if there's any duplicates in interfaces
ResourceMark rm(THREAD);