1268 lines
21 KiB
PHP
1268 lines
21 KiB
PHP
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; flat assembler core
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; Copyright (c) 1999-2016, Tomasz Grysztar.
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; All rights reserved.
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convert_expression:
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push ebp
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call get_fp_value
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jnc fp_expression
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mov [current_offset],esp
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expression_loop:
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push edi
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mov edi,single_operand_operators
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call get_operator
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pop edi
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or al,al
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jz expression_element
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cmp al,82h
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je expression_loop
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push eax
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jmp expression_loop
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expression_element:
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mov al,[esi]
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cmp al,1Ah
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je expression_number
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cmp al,22h
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je expression_number
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cmp al,'('
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je expression_number
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mov al,'!'
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stos byte [edi]
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jmp expression_operator
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expression_number:
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call convert_number
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expression_operator:
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push edi
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mov edi,operators
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call get_operator
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pop edi
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or al,al
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jz expression_end
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operators_loop:
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cmp esp,[current_offset]
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je push_operator
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mov bl,al
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and bl,0F0h
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mov bh,byte [esp]
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and bh,0F0h
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cmp bl,bh
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ja push_operator
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pop ebx
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mov byte [edi],bl
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inc edi
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jmp operators_loop
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push_operator:
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push eax
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jmp expression_loop
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expression_end:
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cmp esp,[current_offset]
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je expression_converted
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pop eax
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stos byte [edi]
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jmp expression_end
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expression_converted:
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pop ebp
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ret
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fp_expression:
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mov al,'.'
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stos byte [edi]
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mov eax,[fp_value]
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stos dword [edi]
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mov eax,[fp_value+4]
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stos dword [edi]
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mov eax,[fp_value+8]
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stos dword [edi]
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pop ebp
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ret
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convert_number:
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lea eax,[edi+20h]
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mov edx,[memory_end]
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cmp [source_start],0
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je check_memory_for_number
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mov edx,[labels_list]
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check_memory_for_number:
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cmp eax,edx
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jae out_of_memory
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mov eax,esp
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sub eax,100h
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jc stack_overflow
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cmp eax,[stack_limit]
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jb stack_overflow
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cmp byte [esi],'('
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je expression_value
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inc edi
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call get_number
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jc symbol_value
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or ebp,ebp
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jz valid_number
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mov byte [edi-1],0Fh
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ret
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valid_number:
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cmp dword [edi+4],0
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jne qword_number
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cmp word [edi+2],0
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jne dword_number
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cmp byte [edi+1],0
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jne word_number
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byte_number:
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mov byte [edi-1],1
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inc edi
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ret
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qword_number:
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mov byte [edi-1],8
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add edi,8
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ret
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dword_number:
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mov byte [edi-1],4
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scas dword [edi]
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ret
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word_number:
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mov byte [edi-1],2
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scas word [edi]
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ret
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expression_value:
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inc esi
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push [current_offset]
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call convert_expression
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pop [current_offset]
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lods byte [esi]
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cmp al,')'
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je subexpression_closed
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dec esi
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mov al,'!'
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stosb
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subexpression_closed:
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ret
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symbol_value:
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cmp [source_start],0
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je preprocessor_value
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push edi esi
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lods word [esi]
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cmp al,1Ah
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jne no_address_register
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movzx ecx,ah
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call get_symbol
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jc no_address_register
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cmp al,10h
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jne no_address_register
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mov al,ah
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shr ah,4
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cmp ah,4
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je register_value
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and ah,not 1
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cmp ah,8
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je register_value
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cmp ah,0Ch
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jae register_value
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cmp ah,6
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je register_value
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cmp al,23h
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je register_value
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cmp al,25h
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je register_value
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cmp al,26h
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je register_value
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cmp al,27h
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je register_value
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no_address_register:
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pop esi
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mov edi,directive_operators
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call get_operator
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pop edi
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or al,al
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jnz broken_value
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lods byte [esi]
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cmp al,1Ah
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jne invalid_value
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lods byte [esi]
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movzx ecx,al
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call get_label_id
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store_label_value:
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mov byte [edi-1],11h
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stos dword [edi]
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ret
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broken_value:
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mov eax,0Fh
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jmp store_label_value
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register_value:
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pop edx edi
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mov byte [edi-1],10h
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stos byte [edi]
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ret
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preprocessor_value:
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dec edi
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cmp [hash_tree],0
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je invalid_value
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lods byte [esi]
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cmp al,1Ah
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jne invalid_value
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lods byte [esi]
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mov cl,al
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mov ch,10b
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call get_preprocessor_symbol
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jc invalid_value
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push esi
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mov esi,[edx+8]
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push [current_offset]
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call convert_expression
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pop [current_offset]
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pop esi
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ret
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get_number:
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xor ebp,ebp
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lods byte [esi]
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cmp al,22h
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je get_text_number
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cmp al,1Ah
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jne not_number
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lods byte [esi]
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movzx ecx,al
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mov [number_start],esi
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mov al,[esi]
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cmp al,'$'
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je number_begin
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sub al,30h
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cmp al,9
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ja invalid_number
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number_begin:
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mov ebx,esi
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add esi,ecx
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push esi
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dec esi
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mov dword [edi],0
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mov dword [edi+4],0
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cmp byte [ebx],'$'
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je pascal_hex_number
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cmp word [ebx],'0x'
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je get_hex_number
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mov al,[esi]
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dec esi
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cmp al,'h'
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je get_hex_number
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cmp al,'b'
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je get_bin_number
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cmp al,'d'
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je get_dec_number
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cmp al,'o'
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je get_oct_number
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cmp al,'H'
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je get_hex_number
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cmp al,'B'
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je get_bin_number
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cmp al,'D'
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je get_dec_number
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cmp al,'O'
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je get_oct_number
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inc esi
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get_dec_number:
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mov ebx,esi
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mov esi,[number_start]
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get_dec_digit:
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cmp esi,ebx
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ja number_ok
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cmp byte [esi],27h
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je next_dec_digit
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xor edx,edx
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mov eax,[edi]
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shld edx,eax,2
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shl eax,2
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add eax,[edi]
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adc edx,0
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add eax,eax
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adc edx,edx
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mov [edi],eax
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mov eax,[edi+4]
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add eax,eax
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jc dec_out_of_range
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add eax,eax
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jc dec_out_of_range
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add eax,[edi+4]
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jc dec_out_of_range
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add eax,eax
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jc dec_out_of_range
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add eax,edx
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jc dec_out_of_range
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mov [edi+4],eax
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movzx eax,byte [esi]
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sub al,30h
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jc bad_number
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cmp al,9
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ja bad_number
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add [edi],eax
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adc dword [edi+4],0
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jc dec_out_of_range
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next_dec_digit:
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inc esi
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jmp get_dec_digit
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dec_out_of_range:
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cmp esi,ebx
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ja dec_out_of_range_finished
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lods byte [esi]
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cmp al,27h
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je bad_number
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sub al,30h
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jc bad_number
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cmp al,9
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ja bad_number
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jmp dec_out_of_range
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dec_out_of_range_finished:
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or ebp,-1
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jmp number_ok
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bad_number:
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pop eax
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invalid_number:
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mov esi,[number_start]
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dec esi
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not_number:
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dec esi
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stc
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ret
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get_bin_number:
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xor bl,bl
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get_bin_digit:
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cmp esi,[number_start]
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jb number_ok
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movzx eax,byte [esi]
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cmp al,27h
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je bin_digit_skip
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sub al,30h
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cmp al,1
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ja bad_number
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xor edx,edx
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mov cl,bl
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dec esi
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cmp bl,64
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je bin_out_of_range
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inc bl
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cmp cl,32
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jae bin_digit_high
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shl eax,cl
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or dword [edi],eax
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jmp get_bin_digit
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bin_digit_high:
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sub cl,32
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shl eax,cl
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or dword [edi+4],eax
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jmp get_bin_digit
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bin_out_of_range:
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or al,al
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jz get_bin_digit
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or ebp,-1
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jmp get_bin_digit
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bin_digit_skip:
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dec esi
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jmp get_bin_digit
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pascal_hex_number:
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cmp cl,1
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je bad_number
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get_hex_number:
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xor bl,bl
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get_hex_digit:
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cmp esi,[number_start]
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jb number_ok
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movzx eax,byte [esi]
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cmp al,27h
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je hex_digit_skip
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cmp al,'x'
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je hex_number_ok
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cmp al,'$'
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je pascal_hex_ok
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sub al,30h
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cmp al,9
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jbe hex_digit_ok
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sub al,7
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cmp al,15
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jbe hex_letter_digit_ok
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sub al,20h
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cmp al,15
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ja bad_number
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hex_letter_digit_ok:
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cmp al,10
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jb bad_number
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hex_digit_ok:
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xor edx,edx
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mov cl,bl
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dec esi
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cmp bl,64
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je hex_out_of_range
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add bl,4
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cmp cl,32
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jae hex_digit_high
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shl eax,cl
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or dword [edi],eax
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jmp get_hex_digit
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hex_digit_high:
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sub cl,32
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shl eax,cl
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or dword [edi+4],eax
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jmp get_hex_digit
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hex_out_of_range:
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or al,al
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jz get_hex_digit
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or ebp,-1
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jmp get_hex_digit
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hex_digit_skip:
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dec esi
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jmp get_hex_digit
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get_oct_number:
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xor bl,bl
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get_oct_digit:
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cmp esi,[number_start]
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jb number_ok
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movzx eax,byte [esi]
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cmp al,27h
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je oct_digit_skip
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sub al,30h
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cmp al,7
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ja bad_number
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oct_digit_ok:
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xor edx,edx
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mov cl,bl
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dec esi
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cmp bl,63
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ja oct_out_of_range
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jne oct_range_ok
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cmp al,1
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ja oct_out_of_range
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oct_range_ok:
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add bl,3
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cmp cl,30
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je oct_digit_wrap
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ja oct_digit_high
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shl eax,cl
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or dword [edi],eax
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jmp get_oct_digit
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oct_digit_wrap:
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shl eax,cl
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adc dword [edi+4],0
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or dword [edi],eax
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jmp get_oct_digit
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oct_digit_high:
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sub cl,32
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shl eax,cl
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or dword [edi+4],eax
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jmp get_oct_digit
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oct_digit_skip:
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dec esi
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jmp get_oct_digit
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oct_out_of_range:
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or al,al
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jz get_oct_digit
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or ebp,-1
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jmp get_oct_digit
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hex_number_ok:
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dec esi
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pascal_hex_ok:
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cmp esi,[number_start]
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jne bad_number
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number_ok:
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pop esi
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number_done:
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clc
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ret
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get_text_number:
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lods dword [esi]
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mov edx,eax
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xor bl,bl
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mov dword [edi],0
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mov dword [edi+4],0
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get_text_character:
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sub edx,1
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jc number_done
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movzx eax,byte [esi]
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inc esi
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mov cl,bl
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cmp bl,64
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je text_out_of_range
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add bl,8
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cmp cl,32
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jae text_character_high
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shl eax,cl
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or dword [edi],eax
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jmp get_text_character
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text_character_high:
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sub cl,32
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shl eax,cl
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or dword [edi+4],eax
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jmp get_text_character
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text_out_of_range:
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or ebp,-1
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jmp get_text_character
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get_fp_value:
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push edi esi
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lods byte [esi]
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cmp al,1Ah
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je fp_value_start
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cmp al,'-'
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je fp_sign_ok
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cmp al,'+'
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jne not_fp_value
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fp_sign_ok:
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lods byte [esi]
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cmp al,1Ah
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jne not_fp_value
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fp_value_start:
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lods byte [esi]
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movzx ecx,al
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cmp cl,1
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jbe not_fp_value
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lea edx,[esi+1]
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xor ah,ah
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check_fp_value:
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lods byte [esi]
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cmp al,'.'
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je fp_character_dot
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cmp al,'E'
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je fp_character_exp
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cmp al,'e'
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je fp_character_exp
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cmp al,'F'
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je fp_last_character
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cmp al,'f'
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je fp_last_character
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digit_expected:
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cmp al,'0'
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jb not_fp_value
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cmp al,'9'
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ja not_fp_value
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jmp fp_character_ok
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fp_character_dot:
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cmp esi,edx
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je not_fp_value
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or ah,ah
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jnz not_fp_value
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or ah,1
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lods byte [esi]
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loop digit_expected
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not_fp_value:
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pop esi edi
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stc
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ret
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fp_last_character:
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cmp cl,1
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jne not_fp_value
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or ah,4
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jmp fp_character_ok
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fp_character_exp:
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cmp esi,edx
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je not_fp_value
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cmp ah,1
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ja not_fp_value
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or ah,2
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cmp ecx,1
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jne fp_character_ok
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cmp byte [esi],'+'
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je fp_exp_sign
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cmp byte [esi],'-'
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jne fp_character_ok
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fp_exp_sign:
|
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inc esi
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cmp byte [esi],1Ah
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jne not_fp_value
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inc esi
|
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lods byte [esi]
|
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movzx ecx,al
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inc ecx
|
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fp_character_ok:
|
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dec ecx
|
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jnz check_fp_value
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or ah,ah
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jz not_fp_value
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pop esi
|
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lods byte [esi]
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mov [fp_sign],0
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cmp al,1Ah
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je fp_get
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inc esi
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cmp al,'+'
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je fp_get
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mov [fp_sign],1
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fp_get:
|
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lods byte [esi]
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movzx ecx,al
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xor edx,edx
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mov edi,fp_value
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mov [edi],edx
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mov [edi+4],edx
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mov [edi+12],edx
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call fp_optimize
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mov [fp_format],0
|
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mov al,[esi]
|
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fp_before_dot:
|
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lods byte [esi]
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cmp al,'.'
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je fp_dot
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cmp al,'E'
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je fp_exponent
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cmp al,'e'
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je fp_exponent
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cmp al,'F'
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je fp_done
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cmp al,'f'
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je fp_done
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sub al,30h
|
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mov edi,fp_value+16
|
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xor edx,edx
|
|
mov dword [edi+12],edx
|
|
mov dword [edi],edx
|
|
mov dword [edi+4],edx
|
|
mov [edi+7],al
|
|
mov dl,7
|
|
mov dword [edi+8],edx
|
|
call fp_optimize
|
|
mov edi,fp_value
|
|
push ecx
|
|
mov ecx,10
|
|
call fp_mul
|
|
pop ecx
|
|
mov ebx,fp_value+16
|
|
call fp_add
|
|
loop fp_before_dot
|
|
fp_dot:
|
|
mov edi,fp_value+16
|
|
xor edx,edx
|
|
mov [edi],edx
|
|
mov [edi+4],edx
|
|
mov byte [edi+7],80h
|
|
mov [edi+8],edx
|
|
mov dword [edi+12],edx
|
|
dec ecx
|
|
jz fp_done
|
|
fp_after_dot:
|
|
lods byte [esi]
|
|
cmp al,'E'
|
|
je fp_exponent
|
|
cmp al,'e'
|
|
je fp_exponent
|
|
cmp al,'F'
|
|
je fp_done
|
|
cmp al,'f'
|
|
je fp_done
|
|
inc [fp_format]
|
|
cmp [fp_format],80h
|
|
jne fp_counter_ok
|
|
mov [fp_format],7Fh
|
|
fp_counter_ok:
|
|
dec esi
|
|
mov edi,fp_value+16
|
|
push ecx
|
|
mov ecx,10
|
|
call fp_div
|
|
push dword [edi]
|
|
push dword [edi+4]
|
|
push dword [edi+8]
|
|
push dword [edi+12]
|
|
lods byte [esi]
|
|
sub al,30h
|
|
movzx ecx,al
|
|
call fp_mul
|
|
mov ebx,edi
|
|
mov edi,fp_value
|
|
call fp_add
|
|
mov edi,fp_value+16
|
|
pop dword [edi+12]
|
|
pop dword [edi+8]
|
|
pop dword [edi+4]
|
|
pop dword [edi]
|
|
pop ecx
|
|
dec ecx
|
|
jnz fp_after_dot
|
|
jmp fp_done
|
|
fp_exponent:
|
|
or [fp_format],80h
|
|
xor edx,edx
|
|
xor ebp,ebp
|
|
dec ecx
|
|
jnz get_exponent
|
|
cmp byte [esi],'+'
|
|
je fp_exponent_sign
|
|
cmp byte [esi],'-'
|
|
jne fp_done
|
|
not ebp
|
|
fp_exponent_sign:
|
|
add esi,2
|
|
lods byte [esi]
|
|
movzx ecx,al
|
|
get_exponent:
|
|
movzx eax,byte [esi]
|
|
inc esi
|
|
sub al,30h
|
|
cmp al,10
|
|
jae exponent_ok
|
|
imul edx,10
|
|
cmp edx,8000h
|
|
jae value_out_of_range
|
|
add edx,eax
|
|
loop get_exponent
|
|
exponent_ok:
|
|
mov edi,fp_value
|
|
or edx,edx
|
|
jz fp_done
|
|
mov ecx,edx
|
|
or ebp,ebp
|
|
jnz fp_negative_power
|
|
fp_power:
|
|
push ecx
|
|
mov ecx,10
|
|
call fp_mul
|
|
pop ecx
|
|
loop fp_power
|
|
jmp fp_done
|
|
fp_negative_power:
|
|
push ecx
|
|
mov ecx,10
|
|
call fp_div
|
|
pop ecx
|
|
loop fp_negative_power
|
|
fp_done:
|
|
mov edi,fp_value
|
|
mov al,[fp_format]
|
|
mov [edi+10],al
|
|
mov al,[fp_sign]
|
|
mov [edi+11],al
|
|
test byte [edi+15],80h
|
|
jz fp_ok
|
|
add dword [edi],1
|
|
adc dword [edi+4],0
|
|
jnc fp_ok
|
|
mov eax,[edi+4]
|
|
shrd [edi],eax,1
|
|
shr eax,1
|
|
or eax,80000000h
|
|
mov [edi+4],eax
|
|
inc word [edi+8]
|
|
fp_ok:
|
|
pop edi
|
|
clc
|
|
ret
|
|
fp_mul:
|
|
or ecx,ecx
|
|
jz fp_zero
|
|
mov eax,[edi+12]
|
|
mul ecx
|
|
mov [edi+12],eax
|
|
mov ebx,edx
|
|
mov eax,[edi]
|
|
mul ecx
|
|
add eax,ebx
|
|
adc edx,0
|
|
mov [edi],eax
|
|
mov ebx,edx
|
|
mov eax,[edi+4]
|
|
mul ecx
|
|
add eax,ebx
|
|
adc edx,0
|
|
mov [edi+4],eax
|
|
.loop:
|
|
or edx,edx
|
|
jz .done
|
|
mov eax,[edi]
|
|
shrd [edi+12],eax,1
|
|
mov eax,[edi+4]
|
|
shrd [edi],eax,1
|
|
shrd eax,edx,1
|
|
mov [edi+4],eax
|
|
shr edx,1
|
|
inc dword [edi+8]
|
|
cmp dword [edi+8],8000h
|
|
jge value_out_of_range
|
|
jmp .loop
|
|
.done:
|
|
ret
|
|
fp_div:
|
|
mov eax,[edi+4]
|
|
xor edx,edx
|
|
div ecx
|
|
mov [edi+4],eax
|
|
mov eax,[edi]
|
|
div ecx
|
|
mov [edi],eax
|
|
mov eax,[edi+12]
|
|
div ecx
|
|
mov [edi+12],eax
|
|
mov ebx,eax
|
|
or ebx,[edi]
|
|
or ebx,[edi+4]
|
|
jz fp_zero
|
|
.loop:
|
|
test byte [edi+7],80h
|
|
jnz .exp_ok
|
|
mov eax,[edi]
|
|
shld [edi+4],eax,1
|
|
mov eax,[edi+12]
|
|
shld [edi],eax,1
|
|
add eax,eax
|
|
mov [edi+12],eax
|
|
dec dword [edi+8]
|
|
add edx,edx
|
|
jmp .loop
|
|
.exp_ok:
|
|
mov eax,edx
|
|
xor edx,edx
|
|
div ecx
|
|
add [edi+12],eax
|
|
adc dword [edi],0
|
|
adc dword [edi+4],0
|
|
jnc .done
|
|
mov eax,[edi+4]
|
|
mov ebx,[edi]
|
|
shrd [edi],eax,1
|
|
shrd [edi+12],ebx,1
|
|
shr eax,1
|
|
or eax,80000000h
|
|
mov [edi+4],eax
|
|
inc dword [edi+8]
|
|
.done:
|
|
ret
|
|
fp_add:
|
|
cmp dword [ebx+8],8000h
|
|
je .done
|
|
cmp dword [edi+8],8000h
|
|
je .copy
|
|
mov eax,[ebx+8]
|
|
cmp eax,[edi+8]
|
|
jge .exp_ok
|
|
mov eax,[edi+8]
|
|
.exp_ok:
|
|
call .change_exp
|
|
xchg ebx,edi
|
|
call .change_exp
|
|
xchg ebx,edi
|
|
mov edx,[ebx+12]
|
|
mov eax,[ebx]
|
|
mov ebx,[ebx+4]
|
|
add [edi+12],edx
|
|
adc [edi],eax
|
|
adc [edi+4],ebx
|
|
jnc .done
|
|
mov eax,[edi]
|
|
shrd [edi+12],eax,1
|
|
mov eax,[edi+4]
|
|
shrd [edi],eax,1
|
|
shr eax,1
|
|
or eax,80000000h
|
|
mov [edi+4],eax
|
|
inc dword [edi+8]
|
|
.done:
|
|
ret
|
|
.copy:
|
|
mov eax,[ebx]
|
|
mov [edi],eax
|
|
mov eax,[ebx+4]
|
|
mov [edi+4],eax
|
|
mov eax,[ebx+8]
|
|
mov [edi+8],eax
|
|
mov eax,[ebx+12]
|
|
mov [edi+12],eax
|
|
ret
|
|
.change_exp:
|
|
push ecx
|
|
mov ecx,eax
|
|
sub ecx,[ebx+8]
|
|
mov edx,[ebx+4]
|
|
jecxz .exp_done
|
|
.exp_loop:
|
|
mov ebp,[ebx]
|
|
shrd [ebx+12],ebp,1
|
|
shrd [ebx],edx,1
|
|
shr edx,1
|
|
inc dword [ebx+8]
|
|
loop .exp_loop
|
|
.exp_done:
|
|
mov [ebx+4],edx
|
|
pop ecx
|
|
ret
|
|
fp_optimize:
|
|
mov eax,[edi]
|
|
mov ebp,[edi+4]
|
|
or ebp,[edi]
|
|
or ebp,[edi+12]
|
|
jz fp_zero
|
|
.loop:
|
|
test byte [edi+7],80h
|
|
jnz .done
|
|
shld [edi+4],eax,1
|
|
mov ebp,[edi+12]
|
|
shld eax,ebp,1
|
|
mov [edi],eax
|
|
shl dword [edi+12],1
|
|
dec dword [edi+8]
|
|
jmp .loop
|
|
.done:
|
|
ret
|
|
fp_zero:
|
|
mov dword [edi+8],8000h
|
|
ret
|
|
|
|
preevaluate_logical_expression:
|
|
xor al,al
|
|
preevaluate_embedded_logical_expression:
|
|
mov [logical_value_wrapping],al
|
|
push edi
|
|
call preevaluate_logical_value
|
|
preevaluation_loop:
|
|
cmp al,0FFh
|
|
je invalid_logical_expression
|
|
mov dl,[esi]
|
|
inc esi
|
|
cmp dl,'|'
|
|
je preevaluate_or
|
|
cmp dl,'&'
|
|
je preevaluate_and
|
|
cmp dl,92h
|
|
je preevaluation_done
|
|
or dl,dl
|
|
jnz invalid_logical_expression
|
|
preevaluation_done:
|
|
pop edx
|
|
dec esi
|
|
ret
|
|
preevaluate_or:
|
|
cmp al,'1'
|
|
je quick_true
|
|
cmp al,'0'
|
|
je leave_only_following
|
|
push edi
|
|
mov al,dl
|
|
stos byte [edi]
|
|
call preevaluate_logical_value
|
|
pop ebx
|
|
cmp al,'0'
|
|
je leave_only_preceding
|
|
cmp al,'1'
|
|
jne preevaluation_loop
|
|
stos byte [edi]
|
|
xor al,al
|
|
jmp preevaluation_loop
|
|
preevaluate_and:
|
|
cmp al,'0'
|
|
je quick_false
|
|
cmp al,'1'
|
|
je leave_only_following
|
|
push edi
|
|
mov al,dl
|
|
stos byte [edi]
|
|
call preevaluate_logical_value
|
|
pop ebx
|
|
cmp al,'1'
|
|
je leave_only_preceding
|
|
cmp al,'0'
|
|
jne preevaluation_loop
|
|
stos byte [edi]
|
|
xor al,al
|
|
jmp preevaluation_loop
|
|
leave_only_following:
|
|
mov edi,[esp]
|
|
call preevaluate_logical_value
|
|
jmp preevaluation_loop
|
|
leave_only_preceding:
|
|
mov edi,ebx
|
|
xor al,al
|
|
jmp preevaluation_loop
|
|
quick_true:
|
|
call skip_logical_value
|
|
jc invalid_logical_expression
|
|
mov edi,[esp]
|
|
mov al,'1'
|
|
jmp preevaluation_loop
|
|
quick_false:
|
|
call skip_logical_value
|
|
jc invalid_logical_expression
|
|
mov edi,[esp]
|
|
mov al,'0'
|
|
jmp preevaluation_loop
|
|
invalid_logical_expression:
|
|
pop edi
|
|
mov esi,edi
|
|
mov al,0FFh
|
|
stos byte [edi]
|
|
ret
|
|
skip_logical_value:
|
|
cmp byte [esi],'~'
|
|
jne negation_skipped
|
|
inc esi
|
|
jmp skip_logical_value
|
|
negation_skipped:
|
|
mov al,[esi]
|
|
cmp al,91h
|
|
jne skip_simple_logical_value
|
|
inc esi
|
|
xchg al,[logical_value_wrapping]
|
|
push eax
|
|
skip_logical_expression:
|
|
call skip_logical_value
|
|
lods byte [esi]
|
|
or al,al
|
|
jz wrongly_structured_logical_expression
|
|
cmp al,0Fh
|
|
je wrongly_structured_logical_expression
|
|
cmp al,'|'
|
|
je skip_logical_expression
|
|
cmp al,'&'
|
|
je skip_logical_expression
|
|
cmp al,92h
|
|
jne wrongly_structured_logical_expression
|
|
pop eax
|
|
mov [logical_value_wrapping],al
|
|
logical_value_skipped:
|
|
clc
|
|
ret
|
|
wrongly_structured_logical_expression:
|
|
pop eax
|
|
stc
|
|
ret
|
|
skip_simple_logical_value:
|
|
mov [logical_value_parentheses],0
|
|
find_simple_logical_value_end:
|
|
mov al,[esi]
|
|
or al,al
|
|
jz logical_value_skipped
|
|
cmp al,0Fh
|
|
je logical_value_skipped
|
|
cmp al,'|'
|
|
je logical_value_skipped
|
|
cmp al,'&'
|
|
je logical_value_skipped
|
|
cmp al,91h
|
|
je skip_logical_value_internal_parenthesis
|
|
cmp al,92h
|
|
jne skip_logical_value_symbol
|
|
sub [logical_value_parentheses],1
|
|
jnc skip_logical_value_symbol
|
|
cmp [logical_value_wrapping],91h
|
|
jne skip_logical_value_symbol
|
|
jmp logical_value_skipped
|
|
skip_logical_value_internal_parenthesis:
|
|
inc [logical_value_parentheses]
|
|
skip_logical_value_symbol:
|
|
call skip_symbol
|
|
jmp find_simple_logical_value_end
|
|
preevaluate_logical_value:
|
|
mov ebp,edi
|
|
preevaluate_negation:
|
|
cmp byte [esi],'~'
|
|
jne preevaluate_negation_ok
|
|
movs byte [edi],[esi]
|
|
jmp preevaluate_negation
|
|
preevaluate_negation_ok:
|
|
mov ebx,esi
|
|
cmp byte [esi],91h
|
|
jne preevaluate_simple_logical_value
|
|
lods byte [esi]
|
|
stos byte [edi]
|
|
push ebp
|
|
mov dl,[logical_value_wrapping]
|
|
push edx
|
|
call preevaluate_embedded_logical_expression
|
|
pop edx
|
|
mov [logical_value_wrapping],dl
|
|
pop ebp
|
|
cmp al,0FFh
|
|
je invalid_logical_value
|
|
cmp byte [esi],92h
|
|
jne invalid_logical_value
|
|
or al,al
|
|
jnz preevaluated_expression_value
|
|
movs byte [edi],[esi]
|
|
ret
|
|
preevaluated_expression_value:
|
|
inc esi
|
|
lea edx,[edi-1]
|
|
sub edx,ebp
|
|
test edx,1
|
|
jz expression_negation_ok
|
|
xor al,1
|
|
expression_negation_ok:
|
|
mov edi,ebp
|
|
ret
|
|
invalid_logical_value:
|
|
mov edi,ebp
|
|
mov al,0FFh
|
|
ret
|
|
preevaluate_simple_logical_value:
|
|
xor edx,edx
|
|
mov [logical_value_parentheses],edx
|
|
find_logical_value_boundaries:
|
|
mov al,[esi]
|
|
or al,al
|
|
jz logical_value_boundaries_found
|
|
cmp al,91h
|
|
je logical_value_internal_parentheses
|
|
cmp al,92h
|
|
je logical_value_boundaries_parenthesis_close
|
|
cmp al,'|'
|
|
je logical_value_boundaries_found
|
|
cmp al,'&'
|
|
je logical_value_boundaries_found
|
|
or edx,edx
|
|
jnz next_symbol_in_logical_value
|
|
cmp al,0F0h
|
|
je preevaluable_logical_operator
|
|
cmp al,0F7h
|
|
je preevaluable_logical_operator
|
|
cmp al,0F6h
|
|
jne next_symbol_in_logical_value
|
|
preevaluable_logical_operator:
|
|
mov edx,esi
|
|
next_symbol_in_logical_value:
|
|
call skip_symbol
|
|
jmp find_logical_value_boundaries
|
|
logical_value_internal_parentheses:
|
|
inc [logical_value_parentheses]
|
|
jmp next_symbol_in_logical_value
|
|
logical_value_boundaries_parenthesis_close:
|
|
sub [logical_value_parentheses],1
|
|
jnc next_symbol_in_logical_value
|
|
cmp [logical_value_wrapping],91h
|
|
jne next_symbol_in_logical_value
|
|
logical_value_boundaries_found:
|
|
or edx,edx
|
|
jz non_preevaluable_logical_value
|
|
mov al,[edx]
|
|
cmp al,0F0h
|
|
je compare_symbols
|
|
cmp al,0F7h
|
|
je compare_symbol_types
|
|
cmp al,0F6h
|
|
je scan_symbols_list
|
|
non_preevaluable_logical_value:
|
|
mov ecx,esi
|
|
mov esi,ebx
|
|
sub ecx,esi
|
|
jz invalid_logical_value
|
|
cmp esi,edi
|
|
je leave_logical_value_intact
|
|
rep movs byte [edi],[esi]
|
|
xor al,al
|
|
ret
|
|
leave_logical_value_intact:
|
|
add edi,ecx
|
|
add esi,ecx
|
|
xor al,al
|
|
ret
|
|
compare_symbols:
|
|
lea ecx,[esi-1]
|
|
sub ecx,edx
|
|
mov eax,edx
|
|
sub eax,ebx
|
|
cmp ecx,eax
|
|
jne preevaluated_false
|
|
push esi edi
|
|
mov esi,ebx
|
|
lea edi,[edx+1]
|
|
repe cmps byte [esi],[edi]
|
|
pop edi esi
|
|
je preevaluated_true
|
|
preevaluated_false:
|
|
mov eax,edi
|
|
sub eax,ebp
|
|
test eax,1
|
|
jnz store_true
|
|
store_false:
|
|
mov edi,ebp
|
|
mov al,'0'
|
|
ret
|
|
preevaluated_true:
|
|
mov eax,edi
|
|
sub eax,ebp
|
|
test eax,1
|
|
jnz store_false
|
|
store_true:
|
|
mov edi,ebp
|
|
mov al,'1'
|
|
ret
|
|
compare_symbol_types:
|
|
push esi
|
|
lea esi,[edx+1]
|
|
type_comparison:
|
|
cmp esi,[esp]
|
|
je types_compared
|
|
mov al,[esi]
|
|
cmp al,[ebx]
|
|
jne different_type
|
|
cmp al,'('
|
|
jne equal_type
|
|
mov al,[esi+1]
|
|
mov ah,[ebx+1]
|
|
cmp al,ah
|
|
je equal_type
|
|
or al,al
|
|
jz different_type
|
|
or ah,ah
|
|
jz different_type
|
|
cmp al,'.'
|
|
je different_type
|
|
cmp ah,'.'
|
|
je different_type
|
|
equal_type:
|
|
call skip_symbol
|
|
xchg esi,ebx
|
|
call skip_symbol
|
|
xchg esi,ebx
|
|
jmp type_comparison
|
|
types_compared:
|
|
pop esi
|
|
cmp byte [ebx],0F7h
|
|
jne preevaluated_false
|
|
jmp preevaluated_true
|
|
different_type:
|
|
pop esi
|
|
jmp preevaluated_false
|
|
scan_symbols_list:
|
|
push edi esi
|
|
lea esi,[edx+1]
|
|
sub edx,ebx
|
|
lods byte [esi]
|
|
cmp al,'<'
|
|
jne invalid_symbols_list
|
|
get_next_from_list:
|
|
mov edi,esi
|
|
get_from_list:
|
|
cmp byte [esi],','
|
|
je compare_in_list
|
|
cmp byte [esi],'>'
|
|
je compare_in_list
|
|
cmp esi,[esp]
|
|
jae invalid_symbols_list
|
|
call skip_symbol
|
|
jmp get_from_list
|
|
compare_in_list:
|
|
mov ecx,esi
|
|
sub ecx,edi
|
|
cmp ecx,edx
|
|
jne not_equal_length_in_list
|
|
mov esi,ebx
|
|
repe cmps byte [esi],[edi]
|
|
mov esi,edi
|
|
jne not_equal_in_list
|
|
skip_rest_of_list:
|
|
cmp byte [esi],'>'
|
|
je check_list_end
|
|
cmp esi,[esp]
|
|
jae invalid_symbols_list
|
|
call skip_symbol
|
|
jmp skip_rest_of_list
|
|
check_list_end:
|
|
inc esi
|
|
cmp esi,[esp]
|
|
jne invalid_symbols_list
|
|
pop esi edi
|
|
jmp preevaluated_true
|
|
not_equal_in_list:
|
|
add esi,ecx
|
|
not_equal_length_in_list:
|
|
lods byte [esi]
|
|
cmp al,','
|
|
je get_next_from_list
|
|
cmp esi,[esp]
|
|
jne invalid_symbols_list
|
|
pop esi edi
|
|
jmp preevaluated_false
|
|
invalid_symbols_list:
|
|
pop esi edi
|
|
jmp invalid_logical_value
|