1350 lines
24 KiB
PHP
1350 lines
24 KiB
PHP
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; flat assembler core
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; Copyright (c) 1999-2006, Tomasz Grysztar.
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; All rights reserved.
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parser:
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mov eax,[memory_end]
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mov [labels_list],eax
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mov eax,[additional_memory]
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mov [free_additional_memory],eax
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xor eax,eax
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mov [current_locals_prefix],eax
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mov [anonymous_reverse],eax
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mov [anonymous_forward],eax
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mov [hash_tree],eax
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mov [blocks_stack],eax
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mov esi,[memory_start]
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mov edi,[source_start]
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parser_loop:
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mov [current_line],esi
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lea eax,[edi+100h]
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cmp eax,[labels_list]
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jae out_of_memory
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cmp byte [esi+16],0
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je empty_line
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mov al,0Fh
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stos byte [edi]
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mov eax,esi
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stos dword [edi]
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add esi,16
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parse_line:
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cmp byte [esi],1Ah
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jne empty_instruction
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push edi
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add esi,2
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movzx ecx,byte [esi-1]
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cmp byte [esi+ecx],':'
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je simple_label
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cmp byte [esi+ecx],'='
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je constant_label
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call get_instruction
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jnc main_instruction_identified
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cmp byte [esi+ecx],1Ah
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jne no_data_label
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push esi ecx
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lea esi,[esi+ecx+2]
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movzx ecx,byte [esi-1]
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call get_data_directive
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jnc data_label
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pop ecx esi
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no_data_label:
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call get_data_directive
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jnc main_instruction_identified
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pop edi
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sub esi,2
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xor bx,bx
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call parse_line_contents
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jmp parse_next_line
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simple_label:
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pop edi
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call identify_label
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mov byte [edi],2
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inc edi
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stos dword [edi]
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inc esi
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xor al,al
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stos byte [edi]
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jmp parse_line
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constant_label:
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pop edi
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call get_label_id
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mov byte [edi],3
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inc edi
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stos dword [edi]
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xor al,al
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stos byte [edi]
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inc esi
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xor bx,bx
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call parse_line_contents
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jmp parse_next_line
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data_label:
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pop ecx edx
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pop edi
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push eax ebx esi
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mov esi,edx
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movzx ecx,byte [esi-1]
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call identify_label
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mov byte [edi],2
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inc edi
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stos dword [edi]
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pop esi ebx eax
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stos byte [edi]
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push edi
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main_instruction_identified:
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pop edi
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mov dl,al
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mov al,1
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stos byte [edi]
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mov ax,bx
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stos word [edi]
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mov al,dl
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stos byte [edi]
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cmp bx,if_directive-assembler
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je parse_block
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cmp bx,repeat_directive-assembler
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je parse_block
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cmp bx,while_directive-assembler
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je parse_block
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cmp bx,end_directive-assembler
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je parse_end_directive
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cmp bx,else_directive-assembler
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je parse_else
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common_parse:
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call parse_line_contents
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jmp parse_next_line
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empty_instruction:
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lods byte [esi]
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or al,al
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jz parse_next_line
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cmp al,':'
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je invalid_name
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cmp al,3Bh
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je skip_preprocessed_symbol
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dec esi
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call parse_argument
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jmp parse_next_line
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skip_preprocessed_symbol:
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lods byte [esi]
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movzx eax,al
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add esi,eax
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skip_next:
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lods byte [esi]
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or al,al
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jz parse_next_line
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cmp al,1Ah
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je skip_preprocessed_symbol
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cmp al,3Bh
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je skip_preprocessed_symbol
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cmp al,22h
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je skip_preprocessed_string
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jmp skip_next
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skip_preprocessed_string:
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lods dword [esi]
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add esi,eax
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jmp skip_next
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empty_line:
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add esi,17
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parse_next_line:
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cmp esi,[source_start]
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jb parser_loop
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source_parsed:
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cmp [blocks_stack],0
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je blocks_stack_ok
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pop eax
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pop [current_line]
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jmp missing_end_directive
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blocks_stack_ok:
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xor al,al
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stos byte [edi]
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mov eax,[error_line]
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mov [current_line],eax
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cmp [anonymous_forward],0
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jne invalid_value
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add edi,0Fh
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and edi,not 0Fh
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mov [code_start],edi
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ret
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parse_block:
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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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push [current_line]
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mov ax,bx
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shl eax,16
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push eax
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inc [blocks_stack]
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cmp bx,if_directive-assembler
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je parse_if
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cmp bx,while_directive-assembler
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je parse_while
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call parse_line_contents
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jmp parse_next_line
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parse_end_directive:
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cmp byte [esi],1Ah
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jne common_parse
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push edi
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inc esi
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movzx ecx,byte [esi]
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inc esi
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call get_instruction
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pop edi
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jnc parse_end_block
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sub esi,2
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jmp common_parse
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parse_end_block:
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mov dl,al
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mov al,1
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stos byte [edi]
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mov ax,bx
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stos word [edi]
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mov al,dl
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stos byte [edi]
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lods byte [esi]
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or al,al
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jnz extra_characters_on_line
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cmp bx,if_directive-assembler
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je close_parsing_block
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cmp bx,repeat_directive-assembler
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je close_parsing_block
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cmp bx,while_directive-assembler
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je close_parsing_block
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jmp parse_next_line
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close_parsing_block:
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cmp [blocks_stack],0
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je unexpected_instruction
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cmp bx,[esp+2]
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jne unexpected_instruction
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dec [blocks_stack]
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pop eax edx
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cmp bx,if_directive-assembler
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jne parse_next_line
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test al,1100b
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jz parse_next_line
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test al,10000b
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jnz parse_next_line
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sub edi,8
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jmp parse_next_line
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parse_if:
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push edi
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call parse_line_contents
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xor al,al
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stos byte [edi]
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xchg esi,[esp]
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mov edi,esi
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call preevaluate_logical_expression
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pop esi
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cmp al,'0'
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je parse_false_condition_block
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cmp al,'1'
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je parse_true_condition_block
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or byte [esp],10000b
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jmp parse_next_line
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parse_while:
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push edi
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call parse_line_contents
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xor al,al
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stos byte [edi]
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xchg esi,[esp]
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mov edi,esi
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call preevaluate_logical_expression
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pop esi
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cmp al,'0'
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je parse_false_condition_block
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cmp al,'1'
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jne parse_next_line
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stos byte [edi]
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jmp parse_next_line
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parse_false_condition_block:
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or byte [esp],1
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sub edi,4
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jmp skip_parsing
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parse_true_condition_block:
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or byte [esp],100b
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sub edi,4
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jmp parse_next_line
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parse_else:
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cmp [blocks_stack],0
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je unexpected_instruction
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cmp word [esp+2],if_directive-assembler
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jne unexpected_instruction
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lods byte [esi]
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or al,al
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jz parse_pure_else
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cmp al,1Ah
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jne extra_characters_on_line
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push edi
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movzx ecx,byte [esi]
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inc esi
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call get_instruction
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jc extra_characters_on_line
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pop edi
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cmp bx,if_directive-assembler
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jne extra_characters_on_line
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test byte [esp],100b
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jnz skip_true_condition_else
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mov dl,al
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mov al,1
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stos byte [edi]
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mov ax,bx
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stos word [edi]
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mov al,dl
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stos byte [edi]
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jmp parse_if
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skip_true_condition_else:
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sub edi,4
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or byte [esp],1
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jmp skip_parsing_contents
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parse_pure_else:
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bts dword [esp],1
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jc unexpected_instruction
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test byte [esp],100b
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jz parse_next_line
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sub edi,4
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or byte [esp],1
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jmp skip_parsing
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skip_parsing:
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cmp esi,[source_start]
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jae source_parsed
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mov [current_line],esi
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add esi,16
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skip_parsing_line:
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cmp byte [esi],1Ah
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jne skip_parsing_contents
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inc esi
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movzx ecx,byte [esi]
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inc esi
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cmp byte [esi+ecx],':'
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je skip_parsing_label
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push edi
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call get_instruction
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pop edi
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jnc skip_parsing_instruction
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add esi,ecx
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jmp skip_parsing_contents
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skip_parsing_label:
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lea esi,[esi+ecx+1]
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jmp skip_parsing_line
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skip_parsing_instruction:
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cmp bx,if_directive-assembler
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je skip_parsing_block
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cmp bx,repeat_directive-assembler
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je skip_parsing_block
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cmp bx,while_directive-assembler
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je skip_parsing_block
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cmp bx,end_directive-assembler
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je skip_parsing_end_directive
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cmp bx,else_directive-assembler
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je skip_parsing_else
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skip_parsing_contents:
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lods byte [esi]
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or al,al
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jz skip_parsing
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cmp al,1Ah
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je skip_parsing_symbol
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cmp al,3Bh
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je skip_parsing_symbol
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cmp al,22h
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je skip_parsing_string
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jmp skip_parsing_contents
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skip_parsing_symbol:
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lods byte [esi]
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movzx eax,al
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add esi,eax
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jmp skip_parsing_contents
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skip_parsing_string:
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lods dword [esi]
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add esi,eax
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jmp skip_parsing_contents
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skip_parsing_block:
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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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push [current_line]
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mov ax,bx
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shl eax,16
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push eax
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inc [blocks_stack]
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jmp skip_parsing_contents
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skip_parsing_end_directive:
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cmp byte [esi],1Ah
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jne skip_parsing_contents
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push edi
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inc esi
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movzx ecx,byte [esi]
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inc esi
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call get_instruction
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pop edi
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jnc skip_parsing_end_block
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add esi,ecx
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jmp skip_parsing_contents
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skip_parsing_end_block:
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lods byte [esi]
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or al,al
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jnz extra_characters_on_line
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cmp bx,if_directive-assembler
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je close_skip_parsing_block
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cmp bx,repeat_directive-assembler
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je close_skip_parsing_block
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cmp bx,while_directive-assembler
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je close_skip_parsing_block
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jmp skip_parsing
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close_skip_parsing_block:
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cmp [blocks_stack],0
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je unexpected_instruction
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cmp bx,[esp+2]
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jne unexpected_instruction
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dec [blocks_stack]
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pop eax edx
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test al,1
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jz skip_parsing
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cmp bx,if_directive-assembler
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jne parse_next_line
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test al,10000b
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jz parse_next_line
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mov al,0Fh
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stos byte [edi]
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mov eax,[current_line]
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stos dword [edi]
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mov eax,1 + (end_directive-assembler) shl 8
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stos dword [edi]
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mov eax,1 + (if_directive-assembler) shl 8
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stos dword [edi]
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jmp parse_next_line
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skip_parsing_else:
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cmp [blocks_stack],0
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je unexpected_instruction
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cmp word [esp+2],if_directive-assembler
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jne unexpected_instruction
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lods byte [esi]
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or al,al
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jz skip_parsing_pure_else
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cmp al,1Ah
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jne extra_characters_on_line
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push edi
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movzx ecx,byte [esi]
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inc esi
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call get_instruction
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jc extra_characters_on_line
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pop edi
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cmp bx,if_directive-assembler
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jne extra_characters_on_line
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mov al,[esp]
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test al,1
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jz skip_parsing_contents
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test al,100b
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jnz skip_parsing_contents
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test al,10000b
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jnz parse_else_if
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xor al,al
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mov [esp],al
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mov al,0Fh
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stos byte [edi]
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mov eax,[current_line]
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stos dword [edi]
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parse_else_if:
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mov eax,1 + (if_directive-assembler) shl 8
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stos dword [edi]
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jmp parse_if
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skip_parsing_pure_else:
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bts dword [esp],1
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jc unexpected_instruction
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mov al,[esp]
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test al,1
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jz skip_parsing
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test al,100b
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jnz skip_parsing
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and al,not 1
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or al,1000b
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mov [esp],al
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jmp parse_next_line
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parse_line_contents:
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mov [parenthesis_stack],0
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parse_instruction_arguments:
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cmp bx,prefix_instruction-assembler
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je allow_embedded_instruction
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cmp bx,times_directive-assembler
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je parse_times_directive
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cmp bx,end_directive-assembler
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je allow_embedded_instruction
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cmp bx,label_directive-assembler
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je parse_label_directive
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cmp bx,segment_directive-assembler
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je parse_label_directive
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cmp bx,load_directive-assembler
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je parse_load_directive
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cmp bx,extrn_directive-assembler
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je parse_extrn_directive
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cmp bx,public_directive-assembler
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je parse_public_directive
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parse_argument:
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lea eax,[edi+100h]
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cmp eax,[labels_list]
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jae out_of_memory
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lods byte [esi]
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cmp al,':'
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je instruction_separator
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cmp al,','
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je separator
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cmp al,'='
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je separator
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cmp al,'|'
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je separator
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cmp al,'&'
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je separator
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cmp al,'~'
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je separator
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cmp al,'>'
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je greater
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cmp al,'<'
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je less
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cmp al,')'
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je close_parenthesis
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or al,al
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jz contents_parsed
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cmp al,'['
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je address_argument
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cmp al,']'
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je separator
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cmp al,'{'
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je unallowed_character
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cmp al,'}'
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je unallowed_character
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cmp al,'#'
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je unallowed_character
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cmp al,'`'
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je unallowed_character
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dec esi
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cmp al,1Ah
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jne expression_argument
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push edi
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mov edi,directive_operators
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call get_operator
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or al,al
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jnz operator_argument
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inc esi
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movzx ecx,byte [esi]
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inc esi
|
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call get_symbol
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jnc symbol_argument
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cmp ecx,1
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jne check_argument
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cmp byte [esi],'?'
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jne check_argument
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pop edi
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movs byte [edi],[esi]
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jmp argument_parsed
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symbol_argument:
|
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pop edi
|
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stos word [edi]
|
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jmp argument_parsed
|
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operator_argument:
|
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pop edi
|
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cmp al,85h
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je ptr_argument
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stos byte [edi]
|
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cmp al,80h
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je forced_expression
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cmp al,81h
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je forced_parenthesis
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cmp al,82h
|
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je parse_from_operator
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cmp al,89h
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je parse_label_operator
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jmp argument_parsed
|
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allow_embedded_instruction:
|
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cmp byte [esi],1Ah
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jne parse_argument
|
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push edi
|
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inc esi
|
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movzx ecx,byte [esi]
|
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inc esi
|
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call get_instruction
|
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jnc embedded_instruction
|
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call get_data_directive
|
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jnc embedded_instruction
|
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pop edi
|
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sub esi,2
|
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jmp parse_argument
|
|
embedded_instruction:
|
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pop edi
|
|
mov dl,al
|
|
mov al,1
|
|
stos byte [edi]
|
|
mov ax,bx
|
|
stos word [edi]
|
|
mov al,dl
|
|
stos byte [edi]
|
|
jmp parse_instruction_arguments
|
|
parse_times_directive:
|
|
mov al,'('
|
|
stos byte [edi]
|
|
call convert_expression
|
|
mov al,')'
|
|
stos byte [edi]
|
|
cmp byte [esi],':'
|
|
jne allow_embedded_instruction
|
|
movs byte [edi],[esi]
|
|
jmp allow_embedded_instruction
|
|
parse_label_directive:
|
|
cmp byte [esi],1Ah
|
|
jne argument_parsed
|
|
push esi
|
|
inc esi
|
|
movzx ecx,byte [esi]
|
|
inc esi
|
|
call identify_label
|
|
pop ebx
|
|
cmp eax,0Fh
|
|
je non_label_identified
|
|
mov byte [edi],2
|
|
inc edi
|
|
stos dword [edi]
|
|
xor al,al
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
non_label_identified:
|
|
mov esi,ebx
|
|
jmp argument_parsed
|
|
parse_load_directive:
|
|
cmp byte [esi],1Ah
|
|
jne argument_parsed
|
|
push esi
|
|
inc esi
|
|
movzx ecx,byte [esi]
|
|
inc esi
|
|
call get_label_id
|
|
pop ebx
|
|
cmp eax,0Fh
|
|
je non_label_identified
|
|
mov byte [edi],2
|
|
inc edi
|
|
stos dword [edi]
|
|
xor al,al
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
parse_public_directive:
|
|
cmp byte [esi],1Ah
|
|
jne parse_argument
|
|
inc esi
|
|
push esi
|
|
movzx ecx,byte [esi]
|
|
inc esi
|
|
mov al,2
|
|
stos byte [edi]
|
|
call get_label_id
|
|
stos dword [edi]
|
|
mov ax,8600h
|
|
stos word [edi]
|
|
pop ebx
|
|
push ebx esi edi
|
|
mov edi,directive_operators
|
|
call get_operator
|
|
pop edi edx ebx
|
|
cmp al,86h
|
|
je argument_parsed
|
|
mov esi,edx
|
|
xchg esi,ebx
|
|
movzx ecx,byte [esi]
|
|
inc esi
|
|
mov ax,'('
|
|
stos word [edi]
|
|
mov eax,ecx
|
|
stos dword [edi]
|
|
rep movs byte [edi],[esi]
|
|
xor al,al
|
|
stos byte [edi]
|
|
xchg esi,ebx
|
|
jmp argument_parsed
|
|
parse_extrn_directive:
|
|
cmp byte [esi],22h
|
|
je parse_quoted_extrn
|
|
cmp byte [esi],1Ah
|
|
jne parse_argument
|
|
push esi
|
|
movzx ecx,byte [esi+1]
|
|
add esi,2
|
|
mov ax,'('
|
|
stos word [edi]
|
|
mov eax,ecx
|
|
stos dword [edi]
|
|
rep movs byte [edi],[esi]
|
|
mov ax,8600h
|
|
stos word [edi]
|
|
pop esi
|
|
parse_label_operator:
|
|
cmp byte [esi],1Ah
|
|
jne argument_parsed
|
|
inc esi
|
|
movzx ecx,byte [esi]
|
|
inc esi
|
|
mov al,2
|
|
stos byte [edi]
|
|
call get_label_id
|
|
stos dword [edi]
|
|
xor al,al
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
parse_from_operator:
|
|
cmp byte [esi],22h
|
|
jne forced_expression
|
|
jmp argument_parsed
|
|
parse_quoted_extrn:
|
|
inc esi
|
|
mov ax,'('
|
|
stos word [edi]
|
|
lods dword [esi]
|
|
mov ecx,eax
|
|
stos dword [edi]
|
|
rep movs byte [edi],[esi]
|
|
xor al,al
|
|
stos byte [edi]
|
|
push esi edi
|
|
mov edi,directive_operators
|
|
call get_operator
|
|
mov edx,esi
|
|
pop edi esi
|
|
cmp al,86h
|
|
jne argument_parsed
|
|
stos byte [edi]
|
|
mov esi,edx
|
|
jmp parse_label_operator
|
|
ptr_argument:
|
|
call parse_address
|
|
jmp address_parsed
|
|
check_argument:
|
|
push esi ecx
|
|
sub esi,2
|
|
mov edi,single_operand_operators
|
|
call get_operator
|
|
pop ecx esi
|
|
or al,al
|
|
jnz not_instruction
|
|
call get_instruction
|
|
jnc embedded_instruction
|
|
call get_data_directive
|
|
jnc embedded_instruction
|
|
not_instruction:
|
|
pop edi
|
|
sub esi,2
|
|
expression_argument:
|
|
cmp byte [esi],22h
|
|
jne not_string
|
|
mov eax,[esi+1]
|
|
lea ebx,[esi+5+eax]
|
|
push ebx ecx esi edi
|
|
mov al,'('
|
|
stos byte [edi]
|
|
call convert_expression
|
|
mov al,')'
|
|
stos byte [edi]
|
|
pop eax edx ecx ebx
|
|
cmp esi,ebx
|
|
jne expression_parsed
|
|
mov edi,eax
|
|
mov esi,edx
|
|
string_argument:
|
|
inc esi
|
|
mov ax,'('
|
|
stos word [edi]
|
|
lods dword [esi]
|
|
mov ecx,eax
|
|
stos dword [edi]
|
|
shr ecx,1
|
|
jnc string_movsb_ok
|
|
movs byte [edi],[esi]
|
|
string_movsb_ok:
|
|
shr ecx,1
|
|
jnc string_movsw_ok
|
|
movs word [edi],[esi]
|
|
string_movsw_ok:
|
|
rep movs dword [edi],[esi]
|
|
xor al,al
|
|
stos byte [edi]
|
|
jmp expression_parsed
|
|
not_string:
|
|
cmp byte [esi],'('
|
|
jne expression
|
|
mov eax,esp
|
|
sub eax,100h
|
|
jc stack_overflow
|
|
cmp eax,[stack_limit]
|
|
jb stack_overflow
|
|
push esi edi
|
|
inc esi
|
|
mov al,'{'
|
|
stos byte [edi]
|
|
inc [parenthesis_stack]
|
|
jmp parse_argument
|
|
expression:
|
|
mov al,'('
|
|
stos byte [edi]
|
|
call convert_expression
|
|
mov al,')'
|
|
stos byte [edi]
|
|
jmp expression_parsed
|
|
forced_expression:
|
|
mov al,'('
|
|
stos byte [edi]
|
|
call convert_expression
|
|
mov al,')'
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
address_argument:
|
|
call parse_address
|
|
lods byte [esi]
|
|
cmp al,']'
|
|
je address_parsed
|
|
dec esi
|
|
mov al,')'
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
address_parsed:
|
|
mov al,']'
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
parse_address:
|
|
mov al,'['
|
|
stos byte [edi]
|
|
cmp word [esi],021Ah
|
|
jne convert_address
|
|
push esi
|
|
add esi,4
|
|
lea ebx,[esi+1]
|
|
cmp byte [esi],':'
|
|
pop esi
|
|
jne convert_address
|
|
add esi,2
|
|
mov ecx,2
|
|
push ebx edi
|
|
call get_symbol
|
|
pop edi esi
|
|
jc unknown_segment_prefix
|
|
cmp al,10h
|
|
jne unknown_segment_prefix
|
|
mov al,ah
|
|
and ah,11110000b
|
|
cmp ah,60h
|
|
jne unknown_segment_prefix
|
|
stos byte [edi]
|
|
jmp convert_address
|
|
unknown_segment_prefix:
|
|
sub esi,5
|
|
convert_address:
|
|
push edi
|
|
mov edi,address_sizes
|
|
call get_operator
|
|
pop edi
|
|
or al,al
|
|
jz convert_expression
|
|
add al,70h
|
|
stos byte [edi]
|
|
jmp convert_expression
|
|
forced_parenthesis:
|
|
cmp byte [esi],'('
|
|
jne argument_parsed
|
|
inc esi
|
|
mov al,'{'
|
|
jmp separator
|
|
unallowed_character:
|
|
mov al,0FFh
|
|
jmp separator
|
|
close_parenthesis:
|
|
mov al,'}'
|
|
separator:
|
|
stos byte [edi]
|
|
jmp argument_parsed
|
|
instruction_separator:
|
|
stos byte [edi]
|
|
jmp allow_embedded_instruction
|
|
greater:
|
|
cmp byte [esi],'='
|
|
jne separator
|
|
inc esi
|
|
mov al,0F2h
|
|
jmp separator
|
|
less:
|
|
cmp byte [edi-1],0F6h
|
|
je separator
|
|
cmp byte [esi],'>'
|
|
je not_equal
|
|
cmp byte [esi],'='
|
|
jne separator
|
|
inc esi
|
|
mov al,0F3h
|
|
jmp separator
|
|
not_equal:
|
|
inc esi
|
|
mov al,0F1h
|
|
jmp separator
|
|
argument_parsed:
|
|
cmp [parenthesis_stack],0
|
|
je parse_argument
|
|
dec [parenthesis_stack]
|
|
add esp,8
|
|
jmp argument_parsed
|
|
expression_parsed:
|
|
cmp [parenthesis_stack],0
|
|
je parse_argument
|
|
cmp byte [esi],')'
|
|
jne argument_parsed
|
|
dec [parenthesis_stack]
|
|
pop edi esi
|
|
jmp expression
|
|
contents_parsed:
|
|
cmp [parenthesis_stack],0
|
|
jne invalid_expression
|
|
ret
|
|
|
|
identify_label:
|
|
cmp byte [esi],'.'
|
|
je local_label_name
|
|
call get_label_id
|
|
cmp eax,10h
|
|
jb label_identified
|
|
or ebx,ebx
|
|
jz anonymous_label_name
|
|
dec ebx
|
|
mov [current_locals_prefix],ebx
|
|
label_identified:
|
|
ret
|
|
anonymous_label_name:
|
|
cmp byte [esi-1],'@'
|
|
je anonymous_label_name_ok
|
|
mov eax,0Fh
|
|
anonymous_label_name_ok:
|
|
ret
|
|
local_label_name:
|
|
call get_label_id
|
|
ret
|
|
|
|
get_operator:
|
|
cmp byte [esi],1Ah
|
|
jne get_simple_operator
|
|
mov edx,esi
|
|
push ebp
|
|
inc esi
|
|
lods byte [esi]
|
|
movzx ebp,al
|
|
push edi
|
|
mov ecx,ebp
|
|
call lower_case
|
|
pop edi
|
|
check_operator:
|
|
mov esi,converted
|
|
movzx ecx,byte [edi]
|
|
jecxz no_operator
|
|
inc edi
|
|
mov ebx,edi
|
|
add ebx,ecx
|
|
cmp ecx,ebp
|
|
jne next_operator
|
|
repe cmps byte [esi],[edi]
|
|
je operator_found
|
|
next_operator:
|
|
mov edi,ebx
|
|
inc edi
|
|
jmp check_operator
|
|
no_operator:
|
|
mov esi,edx
|
|
mov ecx,ebp
|
|
pop ebp
|
|
no_simple_operator:
|
|
xor al,al
|
|
ret
|
|
operator_found:
|
|
lea esi,[edx+2+ebp]
|
|
mov ecx,ebp
|
|
pop ebp
|
|
mov al,[edi]
|
|
ret
|
|
get_simple_operator:
|
|
mov al,[esi]
|
|
cmp al,22h
|
|
je no_simple_operator
|
|
simple_operator:
|
|
cmp byte [edi],1
|
|
jb no_simple_operator
|
|
ja simple_next_operator
|
|
cmp al,[edi+1]
|
|
je simple_operator_found
|
|
simple_next_operator:
|
|
movzx ecx,byte [edi]
|
|
lea edi,[edi+1+ecx+1]
|
|
jmp simple_operator
|
|
simple_operator_found:
|
|
inc esi
|
|
mov al,[edi+2]
|
|
ret
|
|
|
|
get_symbol:
|
|
push esi
|
|
mov ebp,ecx
|
|
call lower_case
|
|
mov ecx,ebp
|
|
cmp cl,11
|
|
ja no_symbol
|
|
sub cl,2
|
|
jc no_symbol
|
|
movzx ebx,word [symbols+ecx*4]
|
|
add ebx,symbols
|
|
movzx edx,word [symbols+ecx*4+2]
|
|
scan_symbols:
|
|
or edx,edx
|
|
jz no_symbol
|
|
mov eax,edx
|
|
shr eax,1
|
|
lea edi,[ebp+2]
|
|
imul eax,edi
|
|
lea edi,[ebx+eax]
|
|
mov esi,converted
|
|
mov ecx,ebp
|
|
repe cmps byte [esi],[edi]
|
|
ja symbols_up
|
|
jb symbols_down
|
|
pop esi
|
|
add esi,ebp
|
|
mov ax,[edi]
|
|
clc
|
|
ret
|
|
no_symbol:
|
|
pop esi
|
|
mov ecx,ebp
|
|
stc
|
|
ret
|
|
symbols_down:
|
|
shr edx,1
|
|
jmp scan_symbols
|
|
symbols_up:
|
|
lea ebx,[edi+ecx+2]
|
|
shr edx,1
|
|
adc edx,-1
|
|
jmp scan_symbols
|
|
|
|
get_data_directive:
|
|
push esi
|
|
mov ebp,ecx
|
|
call lower_case
|
|
mov ecx,ebp
|
|
cmp cl,4
|
|
ja no_instruction
|
|
sub cl,2
|
|
jc no_instruction
|
|
movzx ebx,word [data_directives+ecx*4]
|
|
add ebx,data_directives
|
|
movzx edx,word [data_directives+ecx*4+2]
|
|
jmp scan_instructions
|
|
|
|
get_instruction:
|
|
push esi
|
|
mov ebp,ecx
|
|
call lower_case
|
|
mov ecx,ebp
|
|
cmp cl,11
|
|
ja no_instruction
|
|
sub cl,2
|
|
jc no_instruction
|
|
movzx ebx,word [instructions+ecx*4]
|
|
add ebx,instructions
|
|
movzx edx,word [instructions+ecx*4+2]
|
|
scan_instructions:
|
|
or edx,edx
|
|
jz no_instruction
|
|
mov eax,edx
|
|
shr eax,1
|
|
lea edi,[ebp+3]
|
|
imul eax,edi
|
|
lea edi,[ebx+eax]
|
|
mov esi,converted
|
|
mov ecx,ebp
|
|
repe cmps byte [esi],[edi]
|
|
ja instructions_up
|
|
jb instructions_down
|
|
pop esi
|
|
add esi,ebp
|
|
mov al,[edi]
|
|
mov bx,[edi+1]
|
|
clc
|
|
ret
|
|
no_instruction:
|
|
pop esi
|
|
mov ecx,ebp
|
|
stc
|
|
ret
|
|
instructions_down:
|
|
shr edx,1
|
|
jmp scan_instructions
|
|
instructions_up:
|
|
lea ebx,[edi+ecx+3]
|
|
shr edx,1
|
|
adc edx,-1
|
|
jmp scan_instructions
|
|
|
|
get_label_id:
|
|
cmp ecx,100h
|
|
jae name_too_long
|
|
cmp byte [esi],'@'
|
|
je anonymous_label
|
|
cmp byte [esi],'.'
|
|
jne standard_label
|
|
cmp byte [esi+1],'.'
|
|
je standard_label
|
|
cmp [current_locals_prefix],0
|
|
je standard_label
|
|
push edi
|
|
mov edi,[additional_memory_end]
|
|
sub edi,2
|
|
sub edi,ecx
|
|
push ecx esi
|
|
mov esi,[current_locals_prefix]
|
|
lods byte [esi]
|
|
movzx ecx,al
|
|
sub edi,ecx
|
|
cmp edi,[free_additional_memory]
|
|
jb out_of_memory
|
|
mov word [edi],0
|
|
add edi,2
|
|
mov ebx,edi
|
|
rep movs byte [edi],[esi]
|
|
pop esi ecx
|
|
add al,cl
|
|
jc name_too_long
|
|
rep movs byte [edi],[esi]
|
|
pop edi
|
|
push ebx esi
|
|
movzx ecx,al
|
|
mov byte [ebx-1],al
|
|
mov esi,ebx
|
|
call get_label_id
|
|
pop esi ebx
|
|
cmp ebx,[eax+24]
|
|
jne composed_label_id_ok
|
|
lea edx,[ebx-2]
|
|
mov [additional_memory_end],edx
|
|
composed_label_id_ok:
|
|
ret
|
|
anonymous_label:
|
|
cmp ecx,2
|
|
jne standard_label
|
|
mov al,[esi+1]
|
|
mov ebx,characters
|
|
xlat byte [ebx]
|
|
cmp al,'@'
|
|
je new_anonymous
|
|
cmp al,'b'
|
|
je anonymous_back
|
|
cmp al,'r'
|
|
je anonymous_back
|
|
cmp al,'f'
|
|
jne standard_label
|
|
add esi,2
|
|
mov eax,[anonymous_forward]
|
|
or eax,eax
|
|
jnz anonymous_ok
|
|
mov eax,[current_line]
|
|
mov [error_line],eax
|
|
call allocate_label
|
|
mov [anonymous_forward],eax
|
|
anonymous_ok:
|
|
xor ebx,ebx
|
|
ret
|
|
anonymous_back:
|
|
add esi,2
|
|
mov eax,[anonymous_reverse]
|
|
or eax,eax
|
|
jz invalid_value
|
|
jmp anonymous_ok
|
|
new_anonymous:
|
|
add esi,2
|
|
mov eax,[anonymous_forward]
|
|
or eax,eax
|
|
jnz new_anonymous_ok
|
|
call allocate_label
|
|
new_anonymous_ok:
|
|
mov [anonymous_reverse],eax
|
|
mov [anonymous_forward],0
|
|
jmp anonymous_ok
|
|
standard_label:
|
|
cmp byte [esi],'%'
|
|
je get_predefined_id
|
|
cmp byte [esi],'$'
|
|
jne find_label
|
|
cmp ecx,2
|
|
ja find_label
|
|
inc esi
|
|
jb get_current_offset_id
|
|
inc esi
|
|
cmp byte [esi-1],'$'
|
|
je get_org_origin_id
|
|
sub esi,ecx
|
|
jmp find_label
|
|
get_current_offset_id:
|
|
xor eax,eax
|
|
ret
|
|
get_counter_id:
|
|
mov eax,1
|
|
ret
|
|
get_timestamp_id:
|
|
mov eax,2
|
|
ret
|
|
get_org_origin_id:
|
|
mov eax,3
|
|
ret
|
|
get_predefined_id:
|
|
cmp ecx,2
|
|
ja find_label
|
|
inc esi
|
|
cmp cl,1
|
|
je get_counter_id
|
|
lods byte [esi]
|
|
mov ebx,characters
|
|
xlat [ebx]
|
|
cmp al,'t'
|
|
je get_timestamp_id
|
|
sub esi,2
|
|
find_label:
|
|
xor ebx,ebx
|
|
mov eax,2166136261
|
|
mov ebp,16777619
|
|
hash_label:
|
|
xor al,[esi+ebx]
|
|
mul ebp
|
|
inc bl
|
|
cmp bl,cl
|
|
jb hash_label
|
|
mov ebp,eax
|
|
shl eax,8
|
|
and ebp,0FFh shl 24
|
|
xor ebp,eax
|
|
or ebp,ebx
|
|
mov [label_hash],ebp
|
|
push edi esi
|
|
push ecx
|
|
mov ecx,32
|
|
mov ebx,hash_tree
|
|
follow_tree:
|
|
mov edx,[ebx]
|
|
or edx,edx
|
|
jz extend_tree
|
|
xor eax,eax
|
|
shl ebp,1
|
|
adc eax,0
|
|
lea ebx,[edx+eax*4]
|
|
dec ecx
|
|
jnz follow_tree
|
|
mov [label_leaf],ebx
|
|
pop edx
|
|
mov eax,[ebx]
|
|
or eax,eax
|
|
jz add_label
|
|
mov ebx,esi
|
|
mov ebp,[label_hash]
|
|
compare_labels:
|
|
mov esi,ebx
|
|
mov ecx,edx
|
|
mov edi,[eax+4]
|
|
mov edi,[edi+24]
|
|
repe cmps byte [esi],[edi]
|
|
je label_found
|
|
mov eax,[eax]
|
|
or eax,eax
|
|
jnz compare_labels
|
|
jmp add_label
|
|
label_found:
|
|
add esp,4
|
|
pop edi
|
|
mov eax,[eax+4]
|
|
ret
|
|
extend_tree:
|
|
mov edx,[free_additional_memory]
|
|
lea eax,[edx+8]
|
|
cmp eax,[additional_memory_end]
|
|
ja out_of_memory
|
|
mov [free_additional_memory],eax
|
|
xor eax,eax
|
|
mov [edx],eax
|
|
mov [edx+4],eax
|
|
shl ebp,1
|
|
adc eax,0
|
|
mov [ebx],edx
|
|
lea ebx,[edx+eax*4]
|
|
dec ecx
|
|
jnz extend_tree
|
|
mov [label_leaf],ebx
|
|
pop edx
|
|
add_label:
|
|
mov ecx,edx
|
|
pop esi
|
|
cmp byte [esi-2],0
|
|
je label_name_ok
|
|
mov al,[esi]
|
|
cmp al,30h
|
|
jb name_first_char_ok
|
|
cmp al,39h
|
|
jbe invalid_name
|
|
name_first_char_ok:
|
|
cmp ecx,1
|
|
jne check_for_reserved_word
|
|
cmp al,'$'
|
|
je reserved_word
|
|
check_for_reserved_word:
|
|
call get_instruction
|
|
jnc reserved_word
|
|
call get_data_directive
|
|
jnc reserved_word
|
|
call get_symbol
|
|
jnc reserved_word
|
|
sub esi,2
|
|
mov edi,operators
|
|
call get_operator
|
|
or al,al
|
|
jnz reserved_word
|
|
mov edi,single_operand_operators
|
|
call get_operator
|
|
or al,al
|
|
jnz reserved_word
|
|
mov edi,directive_operators
|
|
call get_operator
|
|
or al,al
|
|
jnz reserved_word
|
|
inc esi
|
|
movzx ecx,byte [esi]
|
|
inc esi
|
|
label_name_ok:
|
|
mov edx,[free_additional_memory]
|
|
lea eax,[edx+8]
|
|
cmp eax,[additional_memory_end]
|
|
ja out_of_memory
|
|
mov [free_additional_memory],eax
|
|
mov ebx,esi
|
|
add esi,ecx
|
|
mov eax,[label_leaf]
|
|
mov edi,[eax]
|
|
mov [edx],edi
|
|
mov [eax],edx
|
|
call allocate_label
|
|
mov [edx+4],eax
|
|
mov [eax+24],ebx
|
|
pop edi
|
|
ret
|
|
reserved_word:
|
|
mov eax,0Fh
|
|
pop edi
|
|
ret
|
|
allocate_label:
|
|
mov eax,[labels_list]
|
|
mov ecx,LABEL_STRUCTURE_SIZE shr 2
|
|
initialize_label:
|
|
sub eax,4
|
|
mov dword [eax],0
|
|
loop initialize_label
|
|
mov [labels_list],eax
|
|
ret
|
|
|
|
LABEL_STRUCTURE_SIZE = 32
|