556 lines
27 KiB
C
556 lines
27 KiB
C
#include <stdint.h>
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#include "assert.h"
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#include "class_file.h"
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#include "hash_table.h"
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#include "malloc.h"
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#include "class_resolver.h"
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#include "string.h"
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#include "debug_class_file.h"
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#include "memory_allocator.h"
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#include "printf.h"
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#include "field_size.h"
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#include "debug.h"
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#include "fatal.h"
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#include "parse_type.h"
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static int field_info_field_size(struct class_file * class_file, struct field_info * field_info)
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{
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struct constant * field_descriptor_constant = &class_file->constant_pool[field_info->descriptor_index - 1];
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#ifdef DEBUG
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assert(field_descriptor_constant->tag == CONSTANT_Utf8);
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#endif
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return field_size(field_descriptor_constant->utf8.bytes[0]);
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}
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static int32_t count_superclass_instance_fields(int class_hash_table_length,
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struct hash_table_entry * class_hash_table,
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struct class_entry * class_entry)
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{
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struct class_entry * subclass_entry = class_entry;
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int instance_field_count = 0;
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while (class_entry->class_file->super_class != 0) {
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class_entry = class_resolver_lookup_class_from_class_index(class_hash_table_length,
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class_hash_table,
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class_entry,
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class_entry->class_file->super_class);
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assert(class_entry != nullptr);
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for (int i = 0; i < class_entry->class_file->fields_count; i++) {
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struct field_info * field_info = &class_entry->class_file->fields[i];
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if (!(field_info->access_flags & FIELD_ACC_STATIC)) {
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instance_field_count += 1;
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}
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}
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}
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struct constant * class_constant = &subclass_entry->class_file->constant_pool[subclass_entry->class_file->this_class - 1];
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assert(class_constant->tag == CONSTANT_Class);
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struct constant * class_name_constant = &subclass_entry->class_file->constant_pool[class_constant->class.name_index - 1];
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assert(class_name_constant->tag == CONSTANT_Utf8);
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debugf("count_superclass_instance_fields: ");
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print_utf8_string(class_name_constant);
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debugf(": %d\n", instance_field_count);
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return instance_field_count;
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}
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static void add_superclass_instance_fields(int class_hash_table_length,
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struct hash_table_entry * class_hash_table,
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int fields_hash_table_length,
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struct hash_table_entry * fields_hash_table,
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struct class_entry * class_entry,
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struct field_entry * field_entry,
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int instance_index)
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{
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while (class_entry->class_file->super_class != 0) {
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class_entry = class_resolver_lookup_class_from_class_index(class_hash_table_length,
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class_hash_table,
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class_entry,
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class_entry->class_file->super_class);
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assert(class_entry != nullptr);
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for (int i = 0; i < class_entry->class_file->fields_count; i++) {
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struct field_info * field_info = &class_entry->class_file->fields[i];
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if (!(field_info->access_flags & FIELD_ACC_STATIC)) {
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field_entry[i].instance_index = instance_index;
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field_entry[i].field_info = field_info;
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instance_index += field_info_field_size(class_entry->class_file, field_info);
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struct constant * name_constant = &class_entry->class_file->constant_pool[field_info->name_index - 1];
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assert(name_constant->tag == CONSTANT_Utf8);
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debugf("hash table entry for field: ");
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print_utf8_string(name_constant);
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debugf(": %d\n", instance_index);
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hash_table_add(fields_hash_table_length,
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fields_hash_table,
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name_constant->utf8.bytes,
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name_constant->utf8.length,
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(void *)&field_entry[i]);
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}
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}
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}
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}
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static int32_t class_resolver_create_fields_hash_table(int class_hash_table_length,
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struct hash_table_entry * class_hash_table,
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struct class_entry * class_entry)
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{
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int total_fields_count = class_entry->class_file->fields_count + count_superclass_instance_fields(class_hash_table_length,
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class_hash_table,
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class_entry);
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int fields_hash_table_length = hash_table_next_power_of_two(class_entry->class_file->fields_count * 2);
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uint32_t fields_hash_table_size = (sizeof (struct hash_table_entry)) * fields_hash_table_length;
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struct hash_table_entry * fields_hash_table = malloc_class_arena(fields_hash_table_size);
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uint32_t field_entry_size = (sizeof (struct field_entry)) * total_fields_count;
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struct field_entry * field_entry = malloc_class_arena(field_entry_size);
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int32_t static_index = 0;
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int32_t instance_index = 0;
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for (int i = 0; i < class_entry->class_file->fields_count; i++) {
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struct field_info * field_info = &class_entry->class_file->fields[i];
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if (field_info->access_flags & FIELD_ACC_STATIC) {
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field_entry[i].static_index = static_index;
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static_index += field_info_field_size(class_entry->class_file, field_info);
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} else {
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field_entry[i].instance_index = instance_index;
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instance_index += field_info_field_size(class_entry->class_file, field_info);
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}
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field_entry[i].field_info = field_info;
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struct constant * name_constant = &class_entry->class_file->constant_pool[field_info->name_index - 1];
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assert(name_constant->tag == CONSTANT_Utf8);
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debugf("hash table entry for field: ");
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print_utf8_string(name_constant);
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debugf(": %d\n", i);
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hash_table_add(fields_hash_table_length,
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fields_hash_table,
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name_constant->utf8.bytes,
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name_constant->utf8.length,
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(void *)&field_entry[i]);
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}
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class_entry->fields.length = fields_hash_table_length;
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class_entry->fields.entry = fields_hash_table;
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class_entry->instance_fields_count = instance_index;
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add_superclass_instance_fields(class_hash_table_length,
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class_hash_table,
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fields_hash_table_length,
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fields_hash_table,
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class_entry,
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&field_entry[class_entry->class_file->fields_count],
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instance_index);
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return static_index;
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}
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static void class_resolver_create_methods_hash_table(struct class_entry * class_entry)
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{
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struct class_file * class_file = class_entry->class_file;
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int methods_hash_table_length = hash_table_next_power_of_two(class_file->methods_count * 2);
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uint32_t methods_hash_table_size = (sizeof (struct hash_table_entry)) * methods_hash_table_length;
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struct hash_table_entry * methods_hash_table = malloc_class_arena(methods_hash_table_size);
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for (int i = 0; i < class_file->methods_count; i++) {
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u2 name_index = class_file->methods[i].name_index;
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struct constant * name_constant = &class_file->constant_pool[name_index - 1];
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assert(name_constant->tag == CONSTANT_Utf8);
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u2 descriptor_index = class_file->methods[i].descriptor_index;
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struct constant * descriptor_constant = &class_file->constant_pool[descriptor_index - 1];
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assert(descriptor_constant->tag == CONSTANT_Utf8);
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debugf("hash table entry for method: ");
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debug_print__constant__method_name(name_constant, descriptor_constant);
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debugc('\n');
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hash_table_add2(methods_hash_table_length,
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methods_hash_table,
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name_constant->utf8.bytes,
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name_constant->utf8.length,
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descriptor_constant->utf8.bytes,
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descriptor_constant->utf8.length,
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(void *)&class_file->methods[i]);
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}
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class_entry->methods.length = methods_hash_table_length;
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class_entry->methods.entry = methods_hash_table;
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}
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static void class_resolver_allocate_static_fields(struct class_entry * class_entry, int32_t static_field_count)
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{
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uint32_t static_fields_size = (sizeof (int32_t)) * static_field_count;
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int32_t * static_fields = malloc_class_arena(static_fields_size);
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for (int i = 0; i < static_field_count; i++) {
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static_fields[i] = 0;
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}
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class_entry->static_fields = static_fields;
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}
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static void class_resolver_allocate_attribute_entry(struct class_entry * class_entry)
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{
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struct class_file * class_file = class_entry->class_file;
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uint32_t attribute_entry_size = (sizeof (union attribute_entry)) * class_file->constant_pool_count;
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union attribute_entry * attribute_entry = malloc_class_arena(attribute_entry_size);
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for (int i = 0; i < class_file->constant_pool_count; i++) {
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attribute_entry[i].class_entry = nullptr;
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}
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class_entry->attribute_entry = attribute_entry;
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}
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struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t ** buffers,
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int length,
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int * hash_table_length)
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{
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int class_hash_table_length = hash_table_next_power_of_two(hash_table_next_power_of_two(length * 2));
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uint32_t class_hash_table_size = (sizeof (struct hash_table_entry)) * class_hash_table_length;
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struct hash_table_entry * class_hash_table = malloc_class_arena(class_hash_table_size);
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uint32_t class_entry_size = (sizeof (struct class_entry)) * length;
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struct class_entry * class_entry = malloc_class_arena(class_entry_size);
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// populate class_hash_table first, to allow for superclass lookups
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for (int i = 0; i < length; i++) {
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struct class_file * class_file = class_file_parse(buffers[i]);
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assert(class_file->magic == 0xcafebabe);
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class_entry[i].class_file = class_file;
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class_entry[i].initialization_state = CLASS_UNINITIALIZED;
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struct constant * class_constant = &class_file->constant_pool[class_file->this_class - 1];
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assert(class_constant->tag == CONSTANT_Class);
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struct constant * class_name_constant = &class_file->constant_pool[class_constant->class.name_index - 1];
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assert(class_name_constant->tag == CONSTANT_Utf8);
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debugf("hash table entry for class: ");
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print_utf8_string(class_name_constant);
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debugf("\n");
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hash_table_add(class_hash_table_length,
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class_hash_table,
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class_name_constant->utf8.bytes,
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class_name_constant->utf8.length,
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&class_entry[i]);
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// make hash table for methods
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class_resolver_create_methods_hash_table(&class_entry[i]);
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// allocate attribute_entry
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class_resolver_allocate_attribute_entry(&class_entry[i]);
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};
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// these functions may reference class_hash_table for superclass lookups
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for (int i = 0; i < length; i++) {
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// make hash table for fields
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int32_t static_field_count = class_resolver_create_fields_hash_table(class_hash_table_length,
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class_hash_table,
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&class_entry[i]);
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// allocate static fields
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class_resolver_allocate_static_fields(&class_entry[i], static_field_count);
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}
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*hash_table_length = class_hash_table_length;
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return class_hash_table;
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}
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struct class_entry * class_resolver_lookup_class(int class_hash_table_length,
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struct hash_table_entry * class_hash_table,
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const uint8_t * class_name,
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int class_name_length)
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{
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debugf("class_resolver_lookup_class: ");
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for (int i = 0; i < class_name_length; i++) { debugc(class_name[i]); }
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debugc('\n');
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struct hash_table_entry * e = hash_table_find(class_hash_table_length,
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class_hash_table,
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class_name,
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class_name_length);
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if (e == nullptr) {
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fatal_print__class_lookup_failed__from_string(class_name, class_name_length);
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assert(e != nullptr);
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}
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return (struct class_entry *)e->value;
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}
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struct class_entry * class_resolver_lookup_class_from_class_index(int class_hash_table_length,
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struct hash_table_entry * class_hash_table,
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struct class_entry * class_entry,
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int32_t class_index)
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{
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if (class_entry->attribute_entry[class_index - 1].class_entry != nullptr) {
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debugf("class_resolver_lookup_class_from_class_index %d: [cached]\n", class_index);
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return class_entry->attribute_entry[class_index - 1].class_entry;
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}
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struct constant * class_constant = &class_entry->class_file->constant_pool[class_index - 1];
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assert(class_constant->tag == CONSTANT_Class);
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struct constant * class_name_constant = &class_entry->class_file->constant_pool[class_constant->class.name_index - 1];
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assert(class_name_constant->tag == CONSTANT_Utf8);
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struct parse_type_ret parse_type_ret = parse_type(class_name_constant->utf8.bytes,
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class_name_constant->utf8.length);
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struct class_entry * _class_entry = class_resolver_lookup_class(class_hash_table_length,
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class_hash_table,
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parse_type_ret.bytes,
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parse_type_ret.length);
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if (_class_entry != nullptr) {
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// cache the result
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class_entry->attribute_entry[class_index - 1].class_entry = _class_entry;
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}
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return _class_entry;
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}
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struct field_entry * class_resolver_lookup_field(int fields_hash_table_length,
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struct hash_table_entry * fields_hash_table,
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const uint8_t * field_name,
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int field_name_length)
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{
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debugf("class_resolver_lookup_field: ");
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for (int i = 0; i < field_name_length; i++) { debugc(field_name[i]); }
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debugc('\n');
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struct hash_table_entry * e = hash_table_find(fields_hash_table_length,
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fields_hash_table,
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field_name,
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field_name_length);
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assert(e != nullptr);
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return (struct field_entry *)e->value;
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}
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struct field_entry * class_resolver_lookup_field_from_fieldref_index(int fields_hash_table_length,
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struct hash_table_entry * fields_hash_table,
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struct class_entry * class_entry,
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int fieldref_index)
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{
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if (class_entry->attribute_entry[fieldref_index - 1].field_entry != nullptr) {
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debugf("class_resolver_lookup_field_from_fieldref_index %d: [cached]\n", fieldref_index);
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return class_entry->attribute_entry[fieldref_index - 1].field_entry;
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}
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struct constant * fieldref_constant = &class_entry->class_file->constant_pool[fieldref_index - 1];
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#ifdef DEBUG
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assert(fieldref_constant->tag == CONSTANT_Fieldref);
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#endif
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struct constant * nameandtype_constant = &class_entry->class_file->constant_pool[fieldref_constant->fieldref.name_and_type_index - 1];
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#ifdef DEBUG
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assert(nameandtype_constant->tag == CONSTANT_NameAndType);
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#endif
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struct constant * field_name_constant = &class_entry->class_file->constant_pool[nameandtype_constant->nameandtype.name_index - 1];
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#ifdef DEBUG
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assert(field_name_constant->tag == CONSTANT_Utf8);
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#endif
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struct field_entry * field_entry = class_resolver_lookup_field(fields_hash_table_length,
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fields_hash_table,
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field_name_constant->utf8.bytes,
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field_name_constant->utf8.length);
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// cache the result
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class_entry->attribute_entry[fieldref_index - 1].field_entry = field_entry;
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return field_entry;
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}
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struct method_info * class_resolver_lookup_method(int methods_hash_table_length,
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struct hash_table_entry * methods_hash_table,
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const uint8_t * method_name,
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int method_name_length,
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const uint8_t * method_descriptor,
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int method_descriptor_length)
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{
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debugf("class_resolver_lookup_method: ");
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for (int i = 0; i < method_name_length; i++) { debugc(method_name[i]); }
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debugc(' ');
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for (int i = 0; i < method_descriptor_length; i++) { debugc(method_descriptor[i]); }
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debugc('\n');
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struct hash_table_entry * e = hash_table_find2(methods_hash_table_length,
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methods_hash_table,
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method_name,
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method_name_length,
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method_descriptor,
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method_descriptor_length);
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if (e == nullptr)
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return nullptr;
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return (struct method_info *)e->value;
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}
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struct method_entry class_resolver_lookup_method_from_interfacemethodref_index(int class_hash_table_length,
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struct hash_table_entry * class_hash_table,
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int32_t interfacemethodref_index,
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struct class_entry * objectref_class_entry,
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struct class_entry * origin_class_entry)
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{
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struct constant * interfacemethodref_constant = &origin_class_entry->class_file->constant_pool[interfacemethodref_index - 1];
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assert(interfacemethodref_constant->tag == CONSTANT_InterfaceMethodref || interfacemethodref_constant->tag == CONSTANT_Methodref);
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struct constant * nameandtype_constant = &origin_class_entry->class_file->constant_pool[interfacemethodref_constant->interfacemethodref.name_and_type_index - 1];
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assert(nameandtype_constant->tag == CONSTANT_NameAndType);
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struct constant * method_name_constant = &origin_class_entry->class_file->constant_pool[nameandtype_constant->nameandtype.name_index - 1];
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assert(method_name_constant->tag == CONSTANT_Utf8);
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struct constant * method_descriptor_constant = &origin_class_entry->class_file->constant_pool[nameandtype_constant->nameandtype.descriptor_index - 1];
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assert(method_descriptor_constant->tag == CONSTANT_Utf8);
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struct class_entry * class_entry = objectref_class_entry;
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while (true) {
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struct method_info * method_info = class_resolver_lookup_method(class_entry->methods.length,
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class_entry->methods.entry,
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method_name_constant->utf8.bytes,
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method_name_constant->utf8.length,
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method_descriptor_constant->utf8.bytes,
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method_descriptor_constant->utf8.length);
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if (method_info != nullptr) {
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debugf("method resolved:\n");
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debugf(" class: ");
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debug_print__class_entry__class_name(class_entry);
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debugf("\n method: ");
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debug_print__method_info__method_name(class_entry, method_info);
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debugc('\n');
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return (struct method_entry){
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.class_entry = class_entry,
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.method_info = method_info
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};
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}
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if (class_entry->class_file->super_class == 0)
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break;
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struct constant * class_constant = &class_entry->class_file->constant_pool[class_entry->class_file->super_class - 1];
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assert(class_constant->tag == CONSTANT_Class);
|
|
struct constant * class_name_constant = &class_entry->class_file->constant_pool[class_constant->class.name_index - 1];
|
|
assert(class_name_constant->tag == CONSTANT_Utf8);
|
|
print_utf8_string(class_name_constant);
|
|
debugf("\n");
|
|
|
|
// lookup the method from the superclass
|
|
class_entry = class_resolver_lookup_class_from_class_index(class_hash_table_length,
|
|
class_hash_table,
|
|
class_entry,
|
|
class_entry->class_file->super_class);
|
|
assert(class_entry != nullptr);
|
|
}
|
|
|
|
assert(!"interfacemethodref method does not exist");
|
|
}
|
|
|
|
struct method_entry * class_resolver_lookup_method_from_methodref_index(int class_hash_table_length,
|
|
struct hash_table_entry * class_hash_table,
|
|
int32_t methodref_index,
|
|
struct class_entry * origin_class_entry)
|
|
{
|
|
if (origin_class_entry->attribute_entry[methodref_index - 1].method_entry != nullptr) {
|
|
debugf("class_resolver_lookup_method_from_methodref_index %d: [cached]\n", methodref_index);
|
|
return origin_class_entry->attribute_entry[methodref_index - 1].method_entry;
|
|
}
|
|
|
|
struct constant * methodref_constant = &origin_class_entry->class_file->constant_pool[methodref_index - 1];
|
|
assert(methodref_constant->tag == CONSTANT_Methodref);
|
|
struct constant * nameandtype_constant = &origin_class_entry->class_file->constant_pool[methodref_constant->methodref.name_and_type_index - 1];
|
|
assert(nameandtype_constant->tag == CONSTANT_NameAndType);
|
|
struct constant * method_name_constant = &origin_class_entry->class_file->constant_pool[nameandtype_constant->nameandtype.name_index - 1];
|
|
assert(method_name_constant->tag == CONSTANT_Utf8);
|
|
struct constant * method_descriptor_constant = &origin_class_entry->class_file->constant_pool[nameandtype_constant->nameandtype.descriptor_index - 1];
|
|
assert(method_descriptor_constant->tag == CONSTANT_Utf8);
|
|
|
|
struct class_entry * class_entry = class_resolver_lookup_class_from_class_index(class_hash_table_length,
|
|
class_hash_table,
|
|
origin_class_entry,
|
|
methodref_constant->methodref.class_index);
|
|
|
|
while (true) {
|
|
struct method_info * method_info = class_resolver_lookup_method(class_entry->methods.length,
|
|
class_entry->methods.entry,
|
|
method_name_constant->utf8.bytes,
|
|
method_name_constant->utf8.length,
|
|
method_descriptor_constant->utf8.bytes,
|
|
method_descriptor_constant->utf8.length);
|
|
if (method_info != nullptr) {
|
|
// cache the result
|
|
debugf("method resolved:\n");
|
|
debugf(" class: ");
|
|
debug_print__class_entry__class_name(class_entry);
|
|
debugf("\n method: ");
|
|
debug_print__method_info__method_name(class_entry, method_info);
|
|
debugc('\n');
|
|
|
|
struct method_entry * method_entry = malloc_class_arena((sizeof (struct method_entry)));
|
|
method_entry->class_entry = class_entry;
|
|
method_entry->method_info = method_info;
|
|
origin_class_entry->attribute_entry[methodref_index - 1].method_entry = method_entry;
|
|
return method_entry;
|
|
}
|
|
|
|
if (class_entry->class_file->super_class == 0)
|
|
break;
|
|
|
|
struct constant * class_constant = &class_entry->class_file->constant_pool[class_entry->class_file->super_class - 1];
|
|
assert(class_constant->tag == CONSTANT_Class);
|
|
struct constant * class_name_constant = &class_entry->class_file->constant_pool[class_constant->class.name_index - 1];
|
|
assert(class_name_constant->tag == CONSTANT_Utf8);
|
|
print_utf8_string(class_name_constant);
|
|
debugf("\n");
|
|
|
|
// lookup the method from the superclass
|
|
class_entry = class_resolver_lookup_class_from_class_index(class_hash_table_length,
|
|
class_hash_table,
|
|
class_entry,
|
|
class_entry->class_file->super_class);
|
|
assert(class_entry != nullptr);
|
|
}
|
|
|
|
assert(!"methodref method does not exist");
|
|
}
|
|
|
|
int32_t * class_resolver_lookup_string(int class_hash_table_length,
|
|
struct hash_table_entry * class_hash_table,
|
|
struct class_entry * class_entry,
|
|
const int string_index)
|
|
{
|
|
debugf("class_resolver_lookup_string: %d\n", string_index);
|
|
if (class_entry->attribute_entry[string_index - 1].string_objectref != nullptr) {
|
|
debugf("class_resolver_lookup_string: [cached]\n");
|
|
return class_entry->attribute_entry[string_index - 1].string_objectref;
|
|
}
|
|
|
|
struct constant * utf8_constant = &class_entry->class_file->constant_pool[string_index - 1];
|
|
assert(utf8_constant->tag == CONSTANT_Utf8);
|
|
|
|
struct class_entry * string_class_entry = class_resolver_lookup_class(class_hash_table_length,
|
|
class_hash_table,
|
|
(const uint8_t *)"java/lang/String",
|
|
16);
|
|
|
|
int32_t size = utf8_constant->utf8.length + 4;
|
|
int32_t * arrayref = memory_allocate(size);
|
|
assert(arrayref != nullptr);
|
|
arrayref[0] = utf8_constant->utf8.length;
|
|
uint8_t * bytearray = (uint8_t *)&arrayref[1];
|
|
for (int i = 0; i < utf8_constant->utf8.length; i++)
|
|
bytearray[i] = utf8_constant->utf8.bytes[i];
|
|
|
|
assert(string_class_entry != nullptr);
|
|
int32_t * objectref = memory_allocate(4 + 4);
|
|
assert(objectref != nullptr);
|
|
objectref[0] = (int32_t)string_class_entry;
|
|
objectref[1] = (int32_t)arrayref;
|
|
|
|
// cache the result
|
|
class_entry->attribute_entry[string_index - 1].string_objectref = objectref;
|
|
|
|
return objectref;
|
|
}
|