--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/prims/jvmtiClassFileReconstituter.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,900 @@
+/*
+ * Copyright (c) 2005, 2017, 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 "classfile/symbolTable.hpp"
+#include "interpreter/bytecodeStream.hpp"
+#include "oops/fieldStreams.hpp"
+#include "prims/jvmtiClassFileReconstituter.hpp"
+#include "runtime/signature.hpp"
+#include "utilities/bytes.hpp"
+
+// FIXME: add Deprecated attribute
+// FIXME: fix Synthetic attribute
+// FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes()
+
+
+// Write the field information portion of ClassFile structure
+// JVMSpec| u2 fields_count;
+// JVMSpec| field_info fields[fields_count];
+void JvmtiClassFileReconstituter::write_field_infos() {
+ HandleMark hm(thread());
+ Array<AnnotationArray*>* fields_anno = ik()->fields_annotations();
+ Array<AnnotationArray*>* fields_type_anno = ik()->fields_type_annotations();
+
+ // Compute the real number of Java fields
+ int java_fields = ik()->java_fields_count();
+
+ write_u2(java_fields);
+ for (JavaFieldStream fs(ik()); !fs.done(); fs.next()) {
+ AccessFlags access_flags = fs.access_flags();
+ int name_index = fs.name_index();
+ int signature_index = fs.signature_index();
+ int initial_value_index = fs.initval_index();
+ guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
+ // int offset = ik()->field_offset( index );
+ int generic_signature_index = fs.generic_signature_index();
+ AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index());
+ AnnotationArray* type_anno = fields_type_anno == NULL ? NULL : fields_type_anno->at(fs.index());
+
+ // JVMSpec| field_info {
+ // JVMSpec| u2 access_flags;
+ // JVMSpec| u2 name_index;
+ // JVMSpec| u2 descriptor_index;
+ // JVMSpec| u2 attributes_count;
+ // JVMSpec| attribute_info attributes[attributes_count];
+ // JVMSpec| }
+
+ write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
+ write_u2(name_index);
+ write_u2(signature_index);
+ int attr_count = 0;
+ if (initial_value_index != 0) {
+ ++attr_count;
+ }
+ if (access_flags.is_synthetic()) {
+ // ++attr_count;
+ }
+ if (generic_signature_index != 0) {
+ ++attr_count;
+ }
+ if (anno != NULL) {
+ ++attr_count; // has RuntimeVisibleAnnotations attribute
+ }
+ if (type_anno != NULL) {
+ ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
+ }
+
+ write_u2(attr_count);
+
+ if (initial_value_index != 0) {
+ write_attribute_name_index("ConstantValue");
+ write_u4(2); //length always 2
+ write_u2(initial_value_index);
+ }
+ if (access_flags.is_synthetic()) {
+ // write_synthetic_attribute();
+ }
+ if (generic_signature_index != 0) {
+ write_signature_attribute(generic_signature_index);
+ }
+ if (anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleAnnotations", anno);
+ }
+ if (type_anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
+ }
+ }
+}
+
+// Write Code attribute
+// JVMSpec| Code_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 max_stack;
+// JVMSpec| u2 max_locals;
+// JVMSpec| u4 code_length;
+// JVMSpec| u1 code[code_length];
+// JVMSpec| u2 exception_table_length;
+// JVMSpec| { u2 start_pc;
+// JVMSpec| u2 end_pc;
+// JVMSpec| u2 handler_pc;
+// JVMSpec| u2 catch_type;
+// JVMSpec| } exception_table[exception_table_length];
+// JVMSpec| u2 attributes_count;
+// JVMSpec| attribute_info attributes[attributes_count];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_code_attribute(const methodHandle& method) {
+ ConstMethod* const_method = method->constMethod();
+ u2 line_num_cnt = 0;
+ int stackmap_len = 0;
+ int local_variable_table_length = 0;
+ int local_variable_type_table_length = 0;
+
+ // compute number and length of attributes
+ int attr_count = 0;
+ int attr_size = 0;
+ if (const_method->has_linenumber_table()) {
+ line_num_cnt = line_number_table_entries(method);
+ if (line_num_cnt != 0) {
+ ++attr_count;
+ // Compute the complete size of the line number table attribute:
+ // LineNumberTable_attribute {
+ // u2 attribute_name_index;
+ // u4 attribute_length;
+ // u2 line_number_table_length;
+ // { u2 start_pc;
+ // u2 line_number;
+ // } line_number_table[line_number_table_length];
+ // }
+ attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
+ }
+ }
+ if (method->has_stackmap_table()) {
+ stackmap_len = method->stackmap_data()->length();
+ if (stackmap_len != 0) {
+ ++attr_count;
+ // Compute the size of the stack map table attribute (VM stores raw):
+ // StackMapTable_attribute {
+ // u2 attribute_name_index;
+ // u4 attribute_length;
+ // u2 number_of_entries;
+ // stack_map_frame_entries[number_of_entries];
+ // }
+ attr_size += 2 + 4 + stackmap_len;
+ }
+ }
+ if (method->has_localvariable_table()) {
+ local_variable_table_length = method->localvariable_table_length();
+ if (local_variable_table_length != 0) {
+ ++attr_count;
+ // Compute the size of the local variable table attribute (VM stores raw):
+ // LocalVariableTable_attribute {
+ // u2 attribute_name_index;
+ // u4 attribute_length;
+ // u2 local_variable_table_length;
+ // {
+ // u2 start_pc;
+ // u2 length;
+ // u2 name_index;
+ // u2 descriptor_index;
+ // u2 index;
+ // }
+ attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2);
+
+ // Local variables with generic signatures must have LVTT entries
+ LocalVariableTableElement *elem = method->localvariable_table_start();
+ for (int idx = 0; idx < local_variable_table_length; idx++) {
+ if (elem[idx].signature_cp_index != 0) {
+ local_variable_type_table_length++;
+ }
+ }
+
+ if (local_variable_type_table_length != 0) {
+ ++attr_count;
+ // Compute the size of the local variable type table attribute (VM stores raw):
+ // LocalVariableTypeTable_attribute {
+ // u2 attribute_name_index;
+ // u4 attribute_length;
+ // u2 local_variable_type_table_length;
+ // {
+ // u2 start_pc;
+ // u2 length;
+ // u2 name_index;
+ // u2 signature_index;
+ // u2 index;
+ // }
+ attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2);
+ }
+ }
+ }
+
+ ExceptionTable exception_table(method());
+ int exception_table_length = exception_table.length();
+ int code_size = const_method->code_size();
+ int size =
+ 2+2+4 + // max_stack, max_locals, code_length
+ code_size + // code
+ 2 + // exception_table_length
+ (2+2+2+2) * exception_table_length + // exception_table
+ 2 + // attributes_count
+ attr_size; // attributes
+
+ write_attribute_name_index("Code");
+ write_u4(size);
+ write_u2(method->verifier_max_stack());
+ write_u2(method->max_locals());
+ write_u4(code_size);
+ copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
+ write_u2(exception_table_length);
+ for (int index = 0; index < exception_table_length; index++) {
+ write_u2(exception_table.start_pc(index));
+ write_u2(exception_table.end_pc(index));
+ write_u2(exception_table.handler_pc(index));
+ write_u2(exception_table.catch_type_index(index));
+ }
+ write_u2(attr_count);
+ if (line_num_cnt != 0) {
+ write_line_number_table_attribute(method, line_num_cnt);
+ }
+ if (stackmap_len != 0) {
+ write_stackmap_table_attribute(method, stackmap_len);
+ }
+ if (local_variable_table_length != 0) {
+ write_local_variable_table_attribute(method, local_variable_table_length);
+ }
+ if (local_variable_type_table_length != 0) {
+ write_local_variable_type_table_attribute(method, local_variable_type_table_length);
+ }
+}
+
+// Write Exceptions attribute
+// JVMSpec| Exceptions_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 number_of_exceptions;
+// JVMSpec| u2 exception_index_table[number_of_exceptions];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) {
+ CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
+ int checked_exceptions_length = const_method->checked_exceptions_length();
+ int size =
+ 2 + // number_of_exceptions
+ 2 * checked_exceptions_length; // exception_index_table
+
+ write_attribute_name_index("Exceptions");
+ write_u4(size);
+ write_u2(checked_exceptions_length);
+ for (int index = 0; index < checked_exceptions_length; index++) {
+ write_u2(checked_exceptions[index].class_cp_index);
+ }
+}
+
+// Write SourceFile attribute
+// JVMSpec| SourceFile_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 sourcefile_index;
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_source_file_attribute() {
+ assert(ik()->source_file_name() != NULL, "caller must check");
+
+ write_attribute_name_index("SourceFile");
+ write_u4(2); // always length 2
+ write_u2(symbol_to_cpool_index(ik()->source_file_name()));
+}
+
+// Write SourceDebugExtension attribute
+// JSR45| SourceDebugExtension_attribute {
+// JSR45| u2 attribute_name_index;
+// JSR45| u4 attribute_length;
+// JSR45| u1 debug_extension[attribute_length];
+// JSR45| }
+void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
+ assert(ik()->source_debug_extension() != NULL, "caller must check");
+
+ write_attribute_name_index("SourceDebugExtension");
+ int len = (int)strlen(ik()->source_debug_extension());
+ write_u4(len);
+ u1* ext = (u1*)ik()->source_debug_extension();
+ for (int i=0; i<len; i++) {
+ write_u1(ext[i]);
+ }
+}
+
+// Write (generic) Signature attribute
+// JVMSpec| Signature_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 signature_index;
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
+ write_attribute_name_index("Signature");
+ write_u4(2); // always length 2
+ write_u2(generic_signature_index);
+}
+
+// Compute the number of entries in the InnerClasses attribute
+u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
+ InnerClassesIterator iter(ik());
+ return iter.length();
+}
+
+// Write an annotation attribute. The VM stores them in raw form, so all we need
+// to do is add the attrubute name and fill in the length.
+// JSR202| *Annotations_attribute {
+// JSR202| u2 attribute_name_index;
+// JSR202| u4 attribute_length;
+// JSR202| ...
+// JSR202| }
+void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
+ AnnotationArray* annos) {
+ u4 length = annos->length();
+ write_attribute_name_index(attr_name);
+ write_u4(length);
+ memcpy(writeable_address(length), annos->adr_at(0), length);
+}
+
+// BootstrapMethods_attribute {
+// u2 attribute_name_index;
+// u4 attribute_length;
+// u2 num_bootstrap_methods;
+// { u2 bootstrap_method_ref;
+// u2 num_bootstrap_arguments;
+// u2 bootstrap_arguments[num_bootstrap_arguments];
+// } bootstrap_methods[num_bootstrap_methods];
+// }
+void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
+ Array<u2>* operands = cpool()->operands();
+ write_attribute_name_index("BootstrapMethods");
+ int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
+
+ // calculate length of attribute
+ int length = sizeof(u2); // num_bootstrap_methods
+ for (int n = 0; n < num_bootstrap_methods; n++) {
+ u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
+ length += sizeof(u2); // bootstrap_method_ref
+ length += sizeof(u2); // num_bootstrap_arguments
+ length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]
+ }
+ write_u4(length);
+
+ // write attribute
+ write_u2(num_bootstrap_methods);
+ for (int n = 0; n < num_bootstrap_methods; n++) {
+ u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);
+ u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
+ write_u2(bootstrap_method_ref);
+ write_u2(num_bootstrap_arguments);
+ for (int arg = 0; arg < num_bootstrap_arguments; arg++) {
+ u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);
+ write_u2(bootstrap_argument);
+ }
+ }
+}
+
+
+// Write InnerClasses attribute
+// JVMSpec| InnerClasses_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 number_of_classes;
+// JVMSpec| { u2 inner_class_info_index;
+// JVMSpec| u2 outer_class_info_index;
+// JVMSpec| u2 inner_name_index;
+// JVMSpec| u2 inner_class_access_flags;
+// JVMSpec| } classes[number_of_classes];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
+ InnerClassesIterator iter(ik());
+ guarantee(iter.length() != 0 && iter.length() == length,
+ "caller must check");
+ u2 entry_count = length / InstanceKlass::inner_class_next_offset;
+ u4 size = 2 + entry_count * (2+2+2+2);
+
+ write_attribute_name_index("InnerClasses");
+ write_u4(size);
+ write_u2(entry_count);
+ for (; !iter.done(); iter.next()) {
+ write_u2(iter.inner_class_info_index());
+ write_u2(iter.outer_class_info_index());
+ write_u2(iter.inner_name_index());
+ write_u2(iter.inner_access_flags());
+ }
+}
+
+// Write Synthetic attribute
+// JVMSpec| Synthetic_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_synthetic_attribute() {
+ write_attribute_name_index("Synthetic");
+ write_u4(0); //length always zero
+}
+
+// Compute size of LineNumberTable
+u2 JvmtiClassFileReconstituter::line_number_table_entries(const methodHandle& method) {
+ // The line number table is compressed so we don't know how big it is until decompressed.
+ // Decompression is really fast so we just do it twice.
+ u2 num_entries = 0;
+ CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
+ while (stream.read_pair()) {
+ num_entries++;
+ }
+ return num_entries;
+}
+
+// Write LineNumberTable attribute
+// JVMSpec| LineNumberTable_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 line_number_table_length;
+// JVMSpec| { u2 start_pc;
+// JVMSpec| u2 line_number;
+// JVMSpec| } line_number_table[line_number_table_length];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_line_number_table_attribute(const methodHandle& method,
+ u2 num_entries) {
+
+ write_attribute_name_index("LineNumberTable");
+ write_u4(2 + num_entries * (2 + 2));
+ write_u2(num_entries);
+
+ CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
+ while (stream.read_pair()) {
+ write_u2(stream.bci());
+ write_u2(stream.line());
+ }
+}
+
+// Write LocalVariableTable attribute
+// JVMSpec| LocalVariableTable_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 local_variable_table_length;
+// JVMSpec| { u2 start_pc;
+// JVMSpec| u2 length;
+// JVMSpec| u2 name_index;
+// JVMSpec| u2 descriptor_index;
+// JVMSpec| u2 index;
+// JVMSpec| } local_variable_table[local_variable_table_length];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_local_variable_table_attribute(const methodHandle& method, u2 num_entries) {
+ write_attribute_name_index("LocalVariableTable");
+ write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
+ write_u2(num_entries);
+
+ assert(method->localvariable_table_length() == num_entries, "just checking");
+
+ LocalVariableTableElement *elem = method->localvariable_table_start();
+ for (int j=0; j<method->localvariable_table_length(); j++) {
+ write_u2(elem->start_bci);
+ write_u2(elem->length);
+ write_u2(elem->name_cp_index);
+ write_u2(elem->descriptor_cp_index);
+ write_u2(elem->slot);
+ elem++;
+ }
+}
+
+// Write LocalVariableTypeTable attribute
+// JVMSpec| LocalVariableTypeTable_attribute {
+// JVMSpec| u2 attribute_name_index;
+// JVMSpec| u4 attribute_length;
+// JVMSpec| u2 local_variable_type_table_length;
+// JVMSpec| { u2 start_pc;
+// JVMSpec| u2 length;
+// JVMSpec| u2 name_index;
+// JVMSpec| u2 signature_index;
+// JVMSpec| u2 index;
+// JVMSpec| } local_variable_type_table[local_variable_type_table_length];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries) {
+ write_attribute_name_index("LocalVariableTypeTable");
+ write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
+ write_u2(num_entries);
+
+ LocalVariableTableElement *elem = method->localvariable_table_start();
+ for (int j=0; j<method->localvariable_table_length(); j++) {
+ if (elem->signature_cp_index > 0) {
+ // Local variable has a generic signature - write LVTT attribute entry
+ write_u2(elem->start_bci);
+ write_u2(elem->length);
+ write_u2(elem->name_cp_index);
+ write_u2(elem->signature_cp_index);
+ write_u2(elem->slot);
+ num_entries--;
+ }
+ elem++;
+ }
+ assert(num_entries == 0, "just checking");
+}
+
+// Write stack map table attribute
+// JSR-202| StackMapTable_attribute {
+// JSR-202| u2 attribute_name_index;
+// JSR-202| u4 attribute_length;
+// JSR-202| u2 number_of_entries;
+// JSR-202| stack_map_frame_entries[number_of_entries];
+// JSR-202| }
+void JvmtiClassFileReconstituter::write_stackmap_table_attribute(const methodHandle& method,
+ int stackmap_len) {
+
+ write_attribute_name_index("StackMapTable");
+ write_u4(stackmap_len);
+ memcpy(
+ writeable_address(stackmap_len),
+ (void*)(method->stackmap_data()->adr_at(0)),
+ stackmap_len);
+}
+
+// Write one method_info structure
+// JVMSpec| method_info {
+// JVMSpec| u2 access_flags;
+// JVMSpec| u2 name_index;
+// JVMSpec| u2 descriptor_index;
+// JVMSpec| u2 attributes_count;
+// JVMSpec| attribute_info attributes[attributes_count];
+// JVMSpec| }
+void JvmtiClassFileReconstituter::write_method_info(const methodHandle& method) {
+ AccessFlags access_flags = method->access_flags();
+ ConstMethod* const_method = method->constMethod();
+ u2 generic_signature_index = const_method->generic_signature_index();
+ AnnotationArray* anno = method->annotations();
+ AnnotationArray* param_anno = method->parameter_annotations();
+ AnnotationArray* default_anno = method->annotation_default();
+ AnnotationArray* type_anno = method->type_annotations();
+
+ // skip generated default interface methods
+ if (method->is_overpass()) {
+ return;
+ }
+
+ write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
+ write_u2(const_method->name_index());
+ write_u2(const_method->signature_index());
+
+ // write attributes in the same order javac does, so we can test with byte for
+ // byte comparison
+ int attr_count = 0;
+ if (const_method->code_size() != 0) {
+ ++attr_count; // has Code attribute
+ }
+ if (const_method->has_checked_exceptions()) {
+ ++attr_count; // has Exceptions attribute
+ }
+ if (default_anno != NULL) {
+ ++attr_count; // has AnnotationDefault attribute
+ }
+ // Deprecated attribute would go here
+ if (access_flags.is_synthetic()) { // FIXME
+ // ++attr_count;
+ }
+ if (generic_signature_index != 0) {
+ ++attr_count;
+ }
+ if (anno != NULL) {
+ ++attr_count; // has RuntimeVisibleAnnotations attribute
+ }
+ if (param_anno != NULL) {
+ ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
+ }
+ if (type_anno != NULL) {
+ ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
+ }
+
+ write_u2(attr_count);
+ if (const_method->code_size() > 0) {
+ write_code_attribute(method);
+ }
+ if (const_method->has_checked_exceptions()) {
+ write_exceptions_attribute(const_method);
+ }
+ if (default_anno != NULL) {
+ write_annotations_attribute("AnnotationDefault", default_anno);
+ }
+ // Deprecated attribute would go here
+ if (access_flags.is_synthetic()) {
+ // write_synthetic_attribute();
+ }
+ if (generic_signature_index != 0) {
+ write_signature_attribute(generic_signature_index);
+ }
+ if (anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleAnnotations", anno);
+ }
+ if (param_anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
+ }
+ if (type_anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
+ }
+}
+
+// Write the class attributes portion of ClassFile structure
+// JVMSpec| u2 attributes_count;
+// JVMSpec| attribute_info attributes[attributes_count];
+void JvmtiClassFileReconstituter::write_class_attributes() {
+ u2 inner_classes_length = inner_classes_attribute_length();
+ Symbol* generic_signature = ik()->generic_signature();
+ AnnotationArray* anno = ik()->class_annotations();
+ AnnotationArray* type_anno = ik()->class_type_annotations();
+
+ int attr_count = 0;
+ if (generic_signature != NULL) {
+ ++attr_count;
+ }
+ if (ik()->source_file_name() != NULL) {
+ ++attr_count;
+ }
+ if (ik()->source_debug_extension() != NULL) {
+ ++attr_count;
+ }
+ if (inner_classes_length > 0) {
+ ++attr_count;
+ }
+ if (anno != NULL) {
+ ++attr_count; // has RuntimeVisibleAnnotations attribute
+ }
+ if (type_anno != NULL) {
+ ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
+ }
+ if (cpool()->operands() != NULL) {
+ ++attr_count;
+ }
+
+ write_u2(attr_count);
+
+ if (generic_signature != NULL) {
+ write_signature_attribute(symbol_to_cpool_index(generic_signature));
+ }
+ if (ik()->source_file_name() != NULL) {
+ write_source_file_attribute();
+ }
+ if (ik()->source_debug_extension() != NULL) {
+ write_source_debug_extension_attribute();
+ }
+ if (inner_classes_length > 0) {
+ write_inner_classes_attribute(inner_classes_length);
+ }
+ if (anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleAnnotations", anno);
+ }
+ if (type_anno != NULL) {
+ write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
+ }
+ if (cpool()->operands() != NULL) {
+ write_bootstrapmethod_attribute();
+ }
+}
+
+// Write the method information portion of ClassFile structure
+// JVMSpec| u2 methods_count;
+// JVMSpec| method_info methods[methods_count];
+void JvmtiClassFileReconstituter::write_method_infos() {
+ HandleMark hm(thread());
+ Array<Method*>* methods = ik()->methods();
+ int num_methods = methods->length();
+ int num_overpass = 0;
+
+ // count the generated default interface methods
+ // these will not be re-created by write_method_info
+ // and should not be included in the total count
+ for (int index = 0; index < num_methods; index++) {
+ Method* method = methods->at(index);
+ if (method->is_overpass()) {
+ num_overpass++;
+ }
+ }
+
+ write_u2(num_methods - num_overpass);
+ if (JvmtiExport::can_maintain_original_method_order()) {
+ int index;
+ int original_index;
+ intArray method_order(num_methods, num_methods, 0);
+
+ // invert the method order mapping
+ for (index = 0; index < num_methods; index++) {
+ original_index = ik()->method_ordering()->at(index);
+ assert(original_index >= 0 && original_index < num_methods,
+ "invalid original method index");
+ method_order.at_put(original_index, index);
+ }
+
+ // write in original order
+ for (original_index = 0; original_index < num_methods; original_index++) {
+ index = method_order.at(original_index);
+ methodHandle method(thread(), methods->at(index));
+ write_method_info(method);
+ }
+ } else {
+ // method order not preserved just dump the method infos
+ for (int index = 0; index < num_methods; index++) {
+ methodHandle method(thread(), methods->at(index));
+ write_method_info(method);
+ }
+ }
+}
+
+void JvmtiClassFileReconstituter::write_class_file_format() {
+ ReallocMark();
+
+ // JVMSpec| ClassFile {
+ // JVMSpec| u4 magic;
+ write_u4(0xCAFEBABE);
+
+ // JVMSpec| u2 minor_version;
+ // JVMSpec| u2 major_version;
+ write_u2(ik()->minor_version());
+ u2 major = ik()->major_version();
+ write_u2(major);
+
+ // JVMSpec| u2 constant_pool_count;
+ // JVMSpec| cp_info constant_pool[constant_pool_count-1];
+ write_u2(cpool()->length());
+ copy_cpool_bytes(writeable_address(cpool_size()));
+
+ // JVMSpec| u2 access_flags;
+ write_u2(ik()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
+
+ // JVMSpec| u2 this_class;
+ // JVMSpec| u2 super_class;
+ write_u2(class_symbol_to_cpool_index(ik()->name()));
+ Klass* super_class = ik()->super();
+ write_u2(super_class == NULL? 0 : // zero for java.lang.Object
+ class_symbol_to_cpool_index(super_class->name()));
+
+ // JVMSpec| u2 interfaces_count;
+ // JVMSpec| u2 interfaces[interfaces_count];
+ Array<Klass*>* interfaces = ik()->local_interfaces();
+ int num_interfaces = interfaces->length();
+ write_u2(num_interfaces);
+ for (int index = 0; index < num_interfaces; index++) {
+ HandleMark hm(thread());
+ InstanceKlass* iik = InstanceKlass::cast(interfaces->at(index));
+ write_u2(class_symbol_to_cpool_index(iik->name()));
+ }
+
+ // JVMSpec| u2 fields_count;
+ // JVMSpec| field_info fields[fields_count];
+ write_field_infos();
+
+ // JVMSpec| u2 methods_count;
+ // JVMSpec| method_info methods[methods_count];
+ write_method_infos();
+
+ // JVMSpec| u2 attributes_count;
+ // JVMSpec| attribute_info attributes[attributes_count];
+ // JVMSpec| } /* end ClassFile 8?
+ write_class_attributes();
+}
+
+address JvmtiClassFileReconstituter::writeable_address(size_t size) {
+ size_t used_size = _buffer_ptr - _buffer;
+ if (size + used_size >= _buffer_size) {
+ // compute the new buffer size: must be at least twice as big as before
+ // plus whatever new is being used; then convert to nice clean block boundary
+ size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
+ * initial_buffer_size;
+
+ // VM goes belly-up if the memory isn't available, so cannot do OOM processing
+ _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
+ _buffer_size = new_buffer_size;
+ _buffer_ptr = _buffer + used_size;
+ }
+ u1* ret_ptr = _buffer_ptr;
+ _buffer_ptr += size;
+ return ret_ptr;
+}
+
+void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
+ TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
+ assert(sym != NULL, "attribute name symbol not found");
+ u2 attr_name_index = symbol_to_cpool_index(sym);
+ assert(attr_name_index != 0, "attribute name symbol not in constant pool");
+ write_u2(attr_name_index);
+}
+
+void JvmtiClassFileReconstituter::write_u1(u1 x) {
+ *writeable_address(1) = x;
+}
+
+void JvmtiClassFileReconstituter::write_u2(u2 x) {
+ Bytes::put_Java_u2(writeable_address(2), x);
+}
+
+void JvmtiClassFileReconstituter::write_u4(u4 x) {
+ Bytes::put_Java_u4(writeable_address(4), x);
+}
+
+void JvmtiClassFileReconstituter::write_u8(u8 x) {
+ Bytes::put_Java_u8(writeable_address(8), x);
+}
+
+void JvmtiClassFileReconstituter::copy_bytecodes(const methodHandle& mh,
+ unsigned char* bytecodes) {
+ // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
+ // and the breakpoint bytecode are converted to their original bytecodes.
+
+ BytecodeStream bs(mh);
+
+ unsigned char* p = bytecodes;
+ Bytecodes::Code code;
+ bool is_rewritten = mh->method_holder()->is_rewritten();
+
+ while ((code = bs.next()) >= 0) {
+ assert(Bytecodes::is_java_code(code), "sanity check");
+ assert(code != Bytecodes::_breakpoint, "sanity check");
+
+ // length of bytecode (mnemonic + operands)
+ address bcp = bs.bcp();
+ int len = bs.instruction_size();
+ assert(len > 0, "length must be > 0");
+
+ // copy the bytecodes
+ *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
+ if (len > 1) {
+ memcpy(p+1, bcp+1, len-1);
+ }
+
+ // During linking the get/put and invoke instructions are rewritten
+ // with an index into the constant pool cache. The original constant
+ // pool index must be returned to caller. Rewrite the index.
+ if (is_rewritten && len > 1) {
+ bool is_wide = false;
+ switch (code) {
+ case Bytecodes::_getstatic : // fall through
+ case Bytecodes::_putstatic : // fall through
+ case Bytecodes::_getfield : // fall through
+ case Bytecodes::_putfield : // fall through
+ case Bytecodes::_invokevirtual : // fall through
+ case Bytecodes::_invokespecial : // fall through
+ case Bytecodes::_invokestatic : // fall through
+ case Bytecodes::_invokedynamic : // fall through
+ case Bytecodes::_invokeinterface : {
+ assert(len == 3 ||
+ (code == Bytecodes::_invokeinterface && len == 5) ||
+ (code == Bytecodes::_invokedynamic && len == 5),
+ "sanity check");
+
+ int cpci = Bytes::get_native_u2(bcp+1);
+ bool is_invokedynamic = (code == Bytecodes::_invokedynamic);
+ ConstantPoolCacheEntry* entry;
+ if (is_invokedynamic) {
+ cpci = Bytes::get_native_u4(bcp+1);
+ entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
+ } else {
+ // cache cannot be pre-fetched since some classes won't have it yet
+ entry = mh->constants()->cache()->entry_at(cpci);
+ }
+ int i = entry->constant_pool_index();
+ assert(i < mh->constants()->length(), "sanity check");
+ Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
+ if (is_invokedynamic) *(p+3) = *(p+4) = 0;
+ break;
+ }
+ case Bytecodes::_ldc_w:
+ is_wide = true; // fall through
+ case Bytecodes::_ldc: {
+ if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
+ int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
+ int i = mh->constants()->object_to_cp_index(cpci);
+ assert(i < mh->constants()->length(), "sanity check");
+ if (is_wide) {
+ Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
+ } else {
+ *(p+1) = (u1)i;
+ }
+ }
+ break;
+ }
+ default:
+ break;
+ }
+ }
+
+ p += len;
+ }
+}