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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 05d3d7d2b9
2 changed files with 33 additions and 1 deletions
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17
c/execute.c
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@ -1093,7 +1093,20 @@ 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)
@ -1785,6 +1798,7 @@ 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 +1809,7 @@ 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();
}
}