135 lines
2.7 KiB
NASM
135 lines
2.7 KiB
NASM
|
|
; This example uses a very simple set of macroinstructions to generate
|
|
; the basic structures of JVM class file.
|
|
; Please refer to "The Java Virtual Machine Specification" for the detailed
|
|
; information on this file format.
|
|
|
|
include 'jclass.inc'
|
|
|
|
format binary as 'class'
|
|
|
|
u4 0xcafebabe ; magic
|
|
u2 0,49 ; minor and major version
|
|
|
|
constant_pool
|
|
|
|
_Code constant_utf8 'Code'
|
|
_init constant_utf8 '<init>'
|
|
_main constant_utf8 'main'
|
|
_void_arrstr constant_utf8 '([Ljava/lang/String;)V'
|
|
Test_class constant_class _Test
|
|
_Test constant_utf8 'Test'
|
|
|
|
Object_init constant_methodref Object_class,init_method
|
|
Object_class constant_class _Object
|
|
_Object constant_utf8 'java/lang/Object'
|
|
init_method constant_nameandtype _init,_void
|
|
_void constant_utf8 '()V'
|
|
|
|
System.out constant_fieldref System_class,out_field
|
|
System_class constant_class _System
|
|
_System constant_utf8 'java/lang/System'
|
|
out_field constant_nameandtype _out,PrintStream_type
|
|
_out constant_utf8 'out'
|
|
PrintStream_type constant_utf8 'Ljava/io/PrintStream;'
|
|
|
|
PrintStream_println constant_methodref PrintStream_class,println_method
|
|
PrintStream_class constant_class _PrintStream
|
|
_PrintStream constant_utf8 'java/io/PrintStream'
|
|
println_method constant_nameandtype _println,_void_str
|
|
_println constant_utf8 'println'
|
|
_void_str constant_utf8 '(Ljava/lang/String;)V'
|
|
|
|
Integer_toString constant_methodref Integer_class,toString_method
|
|
Integer_class constant_class _Integer
|
|
_Integer constant_utf8 'java/lang/Integer'
|
|
toString_method constant_nameandtype _toString,_str_int
|
|
_toString constant_utf8 'toString'
|
|
_str_int constant_utf8 '(I)Ljava/lang/String;'
|
|
|
|
number constant_integer 17
|
|
|
|
end constant_pool
|
|
|
|
u2 ACC_PUBLIC+ACC_SUPER ; access flags
|
|
u2 Test_class ; this class
|
|
u2 Object_class ; super class
|
|
|
|
interfaces
|
|
|
|
end interfaces
|
|
|
|
fields
|
|
|
|
end fields
|
|
|
|
methods
|
|
|
|
method_info ACC_PUBLIC, _init, _void ; public void Test()
|
|
|
|
attribute _Code
|
|
|
|
u2 1 ; max_stack
|
|
u2 1 ; max_locals
|
|
|
|
bytecode
|
|
|
|
aload 0
|
|
invokespecial Object_init
|
|
return
|
|
|
|
end bytecode
|
|
|
|
exceptions
|
|
end exceptions
|
|
|
|
attributes
|
|
end attributes
|
|
|
|
end attribute
|
|
|
|
end method_info
|
|
|
|
method_info ACC_PUBLIC+ACC_STATIC, _main, _void_arrstr ; public static void main(String[] args)
|
|
|
|
attribute _Code
|
|
|
|
u2 3 ; max_stack
|
|
u2 2 ; max_locals
|
|
|
|
bytecode
|
|
|
|
ldc number
|
|
istore 1
|
|
example_loop:
|
|
iload 1
|
|
dup
|
|
imul
|
|
invokestatic Integer_toString
|
|
getstatic System.out
|
|
swap
|
|
invokevirtual PrintStream_println
|
|
iinc 1,-1
|
|
iload 1
|
|
ifne example_loop
|
|
|
|
return
|
|
|
|
end bytecode
|
|
|
|
exceptions
|
|
end exceptions
|
|
|
|
attributes
|
|
end attributes
|
|
|
|
end attribute
|
|
|
|
end method_info
|
|
|
|
end methods
|
|
|
|
attributes
|
|
|
|
end attributes
|