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implement instanceof

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This commit is contained in:
Zack Buhman 2024-12-27 05:31:50 -06:00
parent 168c0abbae
commit 56f65b8dda
2 changed files with 37 additions and 4 deletions
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24
c/execute.c
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@ -66,7 +66,7 @@ void op_anewarray(struct vm * vm, uint32_t index)
int32_t count = operand_stack_pop_u32(vm->current_frame);
int32_t size = 4 * count + 4;
int32_t * arrayref = memory_allocate(size);
assert(arrayref != 0);
assert(arrayref != nullptr);
arrayref[0] = count;
/* All components of the new array are initialized to null, the default value
@ -687,6 +687,7 @@ void op_getfield(struct vm * vm, uint32_t index)
debugf("putfield instance_index %d\n", field_entry->instance_index);
int32_t * objectref = (int32_t *)operand_stack_pop_u32(vm->current_frame);
assert(objectref != nullptr);
int32_t * objectfields = &objectref[1];
switch (field_descriptor_constant->utf8.bytes[0]) {
@ -1093,7 +1094,20 @@ void op_ineg(struct vm * vm)
void op_instanceof(struct vm * vm, uint32_t index)
{
assert(!"op_instanceof");
struct class_entry * class_entry =
class_resolver_lookup_class_from_class_index(vm->class_hash_table.length,
vm->class_hash_table.entry,
vm->current_frame->class_entry,
index);
assert(class_entry != nullptr);
int32_t * objectref = (int32_t *)operand_stack_pop_u32(vm->current_frame);
if (objectref == nullptr) {
operand_stack_push_u32(vm->current_frame, 0);
} else {
int32_t value = objectref[0] == (int32_t)class_entry;
operand_stack_push_u32(vm->current_frame, value);
}
}
void op_invokedynamic(struct vm * vm, uint32_t index)
@ -1603,6 +1617,7 @@ static int32_t * _multiarray(int32_t * dims, int num_dimensions, int level, uint
int32_t element_size = field_size_array(*type);
int32_t size = element_size * count + 4;
int32_t * arrayref = memory_allocate(size);
assert(arrayref != nullptr);
arrayref[0] = count;
int32_t u32_count = (size - 4 + 3) / 4;
@ -1720,8 +1735,7 @@ void op_newarray(struct vm * vm, uint32_t atype)
int32_t count = operand_stack_pop_u32(vm->current_frame);
int32_t size = element_size * count + 4;
int32_t * arrayref = memory_allocate(size);
assert(arrayref != 0);
assert(arrayref != nullptr);
arrayref[0] = count;
/* Each of the elements of the new array is initialized to the default initial
@ -1785,6 +1799,7 @@ void op_putfield(struct vm * vm, uint32_t index)
{
uint32_t value = operand_stack_pop_u32(vm->current_frame);
int32_t * objectref = (int32_t *)operand_stack_pop_u32(vm->current_frame);
assert(objectref != nullptr);
int32_t * objectfields = &objectref[1];
objectfields[field_entry->instance_index] = value;
}
@ -1795,6 +1810,7 @@ void op_putfield(struct vm * vm, uint32_t index)
uint32_t high = operand_stack_pop_u32(vm->current_frame);
uint32_t low = operand_stack_pop_u32(vm->current_frame);
int32_t * objectref = (int32_t *)operand_stack_pop_u32(vm->current_frame);
assert(objectref != nullptr);
int32_t * objectfields = &objectref[1];
objectfields[field_entry->instance_index + 1] = high;
objectfields[field_entry->instance_index] = low;

17
p/InstanceOf.java Normal file
View File

@ -0,0 +1,17 @@
package p;
class ClassA {
}
class InstanceOf {
static boolean test() {
ClassA ca = new ClassA();
Object a = ca;
return (ca instanceof ClassA);
}
public static void main() {
test();
}
}