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