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frame: add support for public static void main(String args[])

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I'm not certain whether I like this, so it's ifdef'ed behind MAIN_STRING_ARRAY
This commit is contained in:
Zack Buhman 2025-01-19 04:33:40 -06:00
parent 072550042c
commit 9fd801b0d8
1 changed files with 35 additions and 0 deletions
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35
c/frame.c
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@ -14,6 +14,7 @@
#include "find_attribute.h"
#include "backtrace.h"
#include "native_types.h"
#include "native_types_allocate.h"
int descriptor_nargs(struct constant * descriptor_constant, uint8_t * return_type)
{
@ -347,7 +348,11 @@ void vm_method_return(struct vm * vm)
break;
}
assert(old_frame->operand_stack_ix == 0);
#ifdef MAIN_STRING_ARRAY
if (vm->frame_stack.ix > 1) {
#else
if (vm->frame_stack.ix > 0) {
#endif
debugs("vm_method_return\n");
debugs("current_frame:\n class: ");
debug_print__class_file__class_name(vm->current_frame->class_entry->class_file);
@ -443,7 +448,11 @@ void vm_execute(struct vm * vm)
decode_print_instruction(vm->current_frame->code_attribute->code, vm->current_frame->pc);
#endif
decode_execute_instruction(vm, vm->current_frame->code_attribute->code, vm->current_frame->pc);
#ifdef MAIN_STRING_ARRAY
if (vm->frame_stack.ix == 1) {
#else
if (vm->frame_stack.ix == 0) {
#endif
debugf("terminate\n");
break;
}
@ -465,7 +474,11 @@ struct vm * vm_start(int class_hash_table_length,
const uint8_t * method_name = (const uint8_t *)"main";
int method_name_length = string_length((const char *)method_name);
#ifdef MAIN_STRING_ARRAY
const uint8_t * method_descriptor = (const uint8_t *)"([Ljava/lang/String;)V";
#else
const uint8_t * method_descriptor = (const uint8_t *)"()V";
#endif
int method_descriptor_length = string_length((const char *)method_descriptor);
struct method_entry method_entry =
@ -492,6 +505,28 @@ struct vm * vm_start(int class_hash_table_length,
uint32_t data[vm.data_stack.capacity];
vm.data_stack.data = data;
#ifdef MAIN_STRING_ARRAY
{
vm.current_frame = stack_push_frame(&vm.frame_stack, 1);
vm.current_frame->operand_stack = stack_push_data(&vm.data_stack, 1);
vm.current_frame->operand_stack_ix = 0;
vm.current_frame->initialization_frame = 0;
vm.current_frame->return_type = 0;
// create empty arrayref
struct arrayref * arrayref = ref_array_allocate(&vm, 0);
assert(arrayref != nullptr);
struct class_entry * string_class_entry = class_resolver_lookup_class(vm.class_hash_table.length,
vm.class_hash_table.entry,
(const uint8_t *)"java/lang/String",
16);
assert(class_entry != nullptr);
arrayref->class_entry = string_class_entry;
operand_stack_push_ref(vm.current_frame, arrayref);
}
#endif // MAIN_STRING_ARRAY
vm_static_method_call(&vm, class_entry, &method_entry);
return &vm;