1108 lines
13 KiB
Text
1108 lines
13 KiB
Text
; initialize global_variables_end
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C=:global_variables_end
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D=:global_variables
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8C=D
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; initialize static_memory_end
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C=:static_memory_end
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D=x500000
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8C=D
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; initialize labels_end
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C=:labels_end
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D=:labels
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8C=D
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; open input file
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J=:input_filename
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I=d0
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syscall x2
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J=A
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?J<0:input_file_error
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; open output file
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J=:output_filename
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I=x241
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D=x1ed
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syscall x2
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J=A
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?J<0:output_file_error
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:second_pass_starting_point
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; write ELF header
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J=d4
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I=:ELF_header
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D=x78
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syscall x1
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:read_line
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; increment line number
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D=:line_number
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C=8D
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C+=d1
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8D=C
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; use rbp to store line pointer
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R=:line
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:read_line_loop
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; read 1 byte into rbp
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J=d3
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I=R
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D=d1
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syscall x0
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D=A
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?D=0:eof
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; check if the character was a newline:
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C=1R
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D=xa
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?C=D:read_line_loop_end
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; check if the character was a tab:
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D=x9
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; if so, don't increment rbp
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?C=D:read_line_loop
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; check if the character was a semicolon:
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D=';
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; if so, it's a comment
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?C=D:handle_comment
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R+=d1
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!:read_line_loop
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:handle_comment
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; read out rest of line from file
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J=d3
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I=R
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D=d1
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syscall x0
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D=A
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?D=0:eof
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C=1R
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D=xa
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; if we didn't reach the end of the line, keep going
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?C!D:handle_comment
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!:read_line_loop_end
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:read_line_loop_end
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; remove whitespace (specifically, ' ' characters) at end of line
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I=R
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:remove_terminal_whitespace_loop
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I-=d1
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C=1I
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D=x20
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?C!D:remove_terminal_whitespace_loop_end
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; replace ' ' with a newline
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D=xa
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1I=D
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!:remove_terminal_whitespace_loop
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:remove_terminal_whitespace_loop_end
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; check if this is a blank line
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C=:line
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D=1C
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C=xa
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?C=D:read_line
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C=':
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?C=D:handle_label_definition
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I=:line
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J=:"global"
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C=x20
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call :string=
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D=A
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?D!0:handle_global
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I=:line
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J=:"local"
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C=x20
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call :string=
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D=A
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?D!0:handle_local
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; arguments are treated the same as local variables
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I=:line
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J=:"argument"
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C=x20
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call :string=
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D=A
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?D!0:handle_local
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I=:line
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J=:"return"
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C=x20
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call :string=
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D=A
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?D!0:handle_return
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; set delimiter to newline
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C=xa
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I=:line
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J=:"function"
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call :string=
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D=A
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?D!0:handle_function
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!:read_line
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:eof
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C=:second_pass
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D=1C
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?D!0:exit_success
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; set 2nd pass to 1
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1C=d1
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; seek both files back to start
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J=d3
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I=d0
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D=d0
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syscall x8
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J=d4
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I=d0
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D=d0
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syscall x8
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!:second_pass_starting_point
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:exit_success
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J=d0
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syscall x3c
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align
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:local_variable_name
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reserve d8
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:handle_local
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R=I
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; emit sub rsp, 8
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J=d4
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I=:sub_rsp_8
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D=d7
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syscall x1
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I=R
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; skip ' '
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I+=d1
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; store away pointer to variable name
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C=:local_variable_name
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8C=I
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; check if already defined
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J=:local_variables
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call :ident_lookup
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C=A
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?C!0:local_redeclaration
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C=:local_variable_name
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I=8C
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J=:local_variables_end
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J=8J
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call :ident_copy
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; increase stack_end, store it in J
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C=:stack_end
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D=4C
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D+=d8
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4C=D
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4J=D
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J+=d4
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; store null terminator
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1J=0
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; update :local_variables_end
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I=:local_variables_end
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8I=J
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; read the next line
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!:read_line
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:sub_rsp_8
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x48
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x81
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xec
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x08
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x00
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x00
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x00
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align
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:global_start
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reserve d8
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:global_variable_name
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reserve d8
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:handle_global
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; ignore if this is the second pass
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C=:second_pass
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C=1C
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?C!0:read_line
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; skip ' '
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I+=d1
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; store away pointer to variable name
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C=:global_variable_name
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8C=I
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; check if already defined
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J=:global_variables
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call :ident_lookup
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C=A
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?C!0:global_redeclaration
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C=:global_variable_name
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I=8C
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J=:global_variables_end
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J=8J
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call :ident_copy
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; store address
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D=:static_memory_end
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C=4D
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4J=C
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J+=d4
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; increase static_memory_end
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C+=d8
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4D=C
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; store null terminator
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1J=0
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; update :global_variables_end
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I=:global_variables_end
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8I=J
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; go read the next line
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!:read_line
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:handle_function
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; emit prologue
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J=d4
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I=:function_prologue
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D=d14
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syscall x1
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; reset local variable table
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D=:local_variables
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1D=0
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C=:local_variables_end
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8C=D
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; reset stack_end
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D=:stack_end
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4D=0
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; go read the next line
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!:read_line
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:function_prologue
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; sub rsp, 8
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x48
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x81
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xec
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x08
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x00
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x00
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x00
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; mov [rsp], rbp
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x48
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x89
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x2c
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x24
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; mov rbp, rsp
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R=S
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; total length: 7 + 4 + 3 = 14 bytes
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:function_epilogue
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; mov rsp, rbp
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S=R
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; mov rbp, [rsp]
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x48
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x8b
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x2c
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x24
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; add rsp, 8
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x48
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x81
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xc4
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x08
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x00
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x00
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x00
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; ret
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return
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; total length = 15 bytes
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:handle_label_definition
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; ignore if this is the second pass
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C=:second_pass
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C=1C
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?C!0:read_line
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; make sure label only has identifier characters
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I=:line
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I+=d1
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:label_checking_loop
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C=1I
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D=xa
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?C=D:label_checking_loop_end
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I+=d1
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B=C
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call :isident
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D=A
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?D!0:label_checking_loop
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!:bad_label
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:label_checking_loop_end
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I=:line
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I+=d1
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J=:global_variables
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call :ident_lookup
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C=A
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?C!0:label_redefinition
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J=:labels_end
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J=8J
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I=:line
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I+=d1
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call :ident_copy
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R=J
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; figure out where in the file we are
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J=d4
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I=d0
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D=d1
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syscall x8
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C=A
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C+=x400000
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J=R
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; store address
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4J=C
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J+=d4
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; update labels_end
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C=:labels_end
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8C=J
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; read the next line
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!:read_line
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:handle_return
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I=:line
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; "return " is 7 chars long
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I+=d7
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call :set_rax_to_term
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J=d4
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I=:function_epilogue
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D=d15
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syscall x1
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; go read the next line
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!:read_line
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:mov_rsp_rbp
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S=R
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:ret
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return
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; copy the newline-terminated identifier from rsi to rdi
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:ident_copy
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C=1I
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B=C
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call :isident
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D=A
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?D=0:bad_identifier
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:ident_loop
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C=1I
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1J=C
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I+=d1
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J+=d1
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D=xa
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?C=D:ident_loop_end
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B=C
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call :isident
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D=A
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?D=0:bad_identifier
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!:ident_loop
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:ident_loop_end
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return
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align
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:ident_lookup_i
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reserve d8
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; look up identifier rsi in list rdi
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; returns address of whatever's right after the identifier in the list, or 0 if not found
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:ident_lookup
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C=:ident_lookup_i
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8C=I
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:ident_lookup_loop
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; check if reached the end of the table
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C=1J
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?C=0:return_0
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I=:ident_lookup_i
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I=8I
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call :ident=
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C=A
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; move past terminator of identifier in table
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:ident_finish_loop
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D=1J
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J+=d1
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A=xa
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?D!A:ident_finish_loop
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; check if this was it
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?C!0:return_J
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; nope. keep going
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; skip over address:
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J+=d4
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!:ident_lookup_loop
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; can the character in rbx appear in an identifier?
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:isident
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A='0
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?B<A:return_0
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; note: 58 = '9' + 1
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A=d58
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?B<A:return_1
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A='A
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?B<A:return_0
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; note: 91 = 'z' + 1
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A=d91
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?B<A:return_1
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A='z
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?B>A:return_0
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; 96 = 'a' - 1
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A=d96
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?B>A:return_1
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A='_
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?B=A:return_1
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!:return_0
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; set rax to the term in rsi
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:set_rax_to_term
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R=I
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C=1I
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D=''
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?C=D:term_char
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C=1I
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D=d58
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?C<D:term_number
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; variable
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J=:local_variables
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call :ident_lookup
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C=A
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?C=0:rax2term_try_global
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; it's a local variable
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; read the offset from rbp
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D=4C
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; put negated offset in rcx
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C=d0
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C-=D
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; store negated offset in :rax2term_addr
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D=:rax2term_addr
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4D=C
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J=d4
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I=:load_rbp_offset_prefix
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D=d3
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syscall x1
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J=d4
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I=:rax2term_addr
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D=d4
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syscall x1
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return
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:rax2term_try_global
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J=:global_variables
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call :ident_lookup
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C=A
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?C=0:bad_term
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; it's a global variable
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; get its address
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C=4C
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D=:rax2term_addr
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4D=C
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; put address in rbx
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J=d4
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I=:mov_ebx_imm32_prefix
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D=d1
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syscall x1
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J=d4
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I=:rax2term_addr
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D=d4
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syscall x1
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; now load [rbx] into rax
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J=d4
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I=:mov_rax_[rbx]
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D=d3
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syscall x1
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return
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:term_char
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I+=d1
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I=1I
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!:set_rax_to_immediate
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:number_is_negative
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reserve d1
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:term_number
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C=1I
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D='-
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; set rdx to 0 if number is positive, 1 if negative
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?C=D:term_number_negative
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D=d0
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!:term_number_cont
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:term_number_negative
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D=d1
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I+=d1
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:term_number_cont
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; store away negativity
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C=:number_is_negative
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1C=D
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C=1I
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D='0
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?C=D:term_hex_number
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; it's a decimal number
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; rbp will store the number
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R=d0
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:decimal_number_loop
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C=1I
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D='9
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?C>D:decimal_number_loop_end
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D='0
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?C<D:decimal_number_loop_end
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C-=D
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; multiply by 10
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B=d10
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A=R
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mul
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R=A
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; add this digit
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R+=C
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I+=d1
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!:decimal_number_loop
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:decimal_number_loop_end
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!:term_number_output
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:term_hex_number
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I+=d1
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C=1I
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D='x
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; 0 followed by something other than x
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?C!D:bad_term
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I+=d1
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; rbp will store the number
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R=d0
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:hex_number_loop
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C=1I
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D='0
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?C<D:hex_number_loop_end
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D=d58
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?C<D:hex_number_0123456789
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D='a
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?C<D:hex_number_loop_end
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D='f
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?C>D:hex_number_loop_end
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; one of the digits a-f
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D=xffffffffffffffa9
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!:hex_number_digit
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:hex_number_0123456789
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D=xffffffffffffffd0
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:hex_number_digit
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C+=D
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; shift left by 4
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R<=d4
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; add digit
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R+=C
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I+=d1
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!:hex_number_loop
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:hex_number_loop_end
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!:term_number_output
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:term_number_output
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; we now have the *unsigned* number in rbp. first, take the sign into consideration
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C=:number_is_negative
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D=1C
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?D=0:number_not_negative
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; R = -R
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C=R
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R=d0
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R-=C
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:number_not_negative
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I=R
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!:set_rax_to_immediate
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; set <rax> to the immediate in rsi.
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:set_rax_to_immediate
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C=:imm64
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8C=I
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; write prefix
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J=d4
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D=d2
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I=:mov_rax_imm64_prefix
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syscall x1
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|
|
; write immediate
|
|
J=d4
|
|
D=d8
|
|
I=:imm64
|
|
syscall x1
|
|
return
|
|
|
|
align
|
|
:rax2term_addr
|
|
reserve d4
|
|
|
|
:mov_ebx_imm32_prefix
|
|
xbb
|
|
|
|
:mov_rax_imm64_prefix
|
|
x48
|
|
xb8
|
|
|
|
align
|
|
:imm64
|
|
reserve d8
|
|
:mov_rax_[rbx]
|
|
x48
|
|
x8b
|
|
x03
|
|
|
|
; prefix for mov rax, [rbp+IMM32]
|
|
:load_rbp_offset_prefix
|
|
x48
|
|
x8b
|
|
x85
|
|
|
|
:input_filename
|
|
str in04b
|
|
x0
|
|
|
|
:output_filename
|
|
str out04b
|
|
x0
|
|
|
|
:input_file_error
|
|
B=:input_file_error_message
|
|
!:general_error
|
|
|
|
:input_file_error_message
|
|
str Couldn't open input file.
|
|
xa
|
|
x0
|
|
|
|
:output_file_error
|
|
B=:output_file_error_message
|
|
!:general_error
|
|
|
|
:output_file_error_message
|
|
str Couldn't open output file.
|
|
xa
|
|
x0
|
|
|
|
:bad_identifier
|
|
B=:bad_identifier_error_message
|
|
!:program_error
|
|
|
|
:bad_identifier_error_message
|
|
str Bad identifier.
|
|
xa
|
|
x0
|
|
|
|
:bad_label
|
|
B=:bad_label_error_message
|
|
!:program_error
|
|
|
|
:bad_label_error_message
|
|
str Bad label.
|
|
xa
|
|
x0
|
|
|
|
:bad_term
|
|
B=:bad_term_error_message
|
|
!:program_error
|
|
|
|
:bad_term_error_message
|
|
str Bad term.
|
|
xa
|
|
x0
|
|
|
|
:label_redefinition
|
|
B=:label_redefinition_error_message
|
|
!:program_error
|
|
|
|
:label_redefinition_error_message
|
|
str Label redefinition.
|
|
xa
|
|
x0
|
|
|
|
:global_redeclaration
|
|
B=:global_redeclaration_error_message
|
|
!:program_error
|
|
|
|
:global_redeclaration_error_message
|
|
str Global variable declared twice.
|
|
xa
|
|
x0
|
|
|
|
:local_redeclaration
|
|
B=:local_redeclaration_error_message
|
|
!:program_error
|
|
|
|
:local_redeclaration_error_message
|
|
str Local variable declared twice.
|
|
xa
|
|
x0
|
|
|
|
:general_error
|
|
call :eputs
|
|
J=d1
|
|
syscall x3c
|
|
|
|
:program_error
|
|
R=B
|
|
|
|
B=:"Line"
|
|
call :eputs
|
|
|
|
D=:line_number
|
|
D=8D
|
|
B=D
|
|
call :eputn
|
|
|
|
B=:line_number_separator
|
|
call :eputs
|
|
|
|
B=R
|
|
call :eputs
|
|
J=d1
|
|
syscall x3c
|
|
|
|
:"Line"
|
|
str Line
|
|
x20
|
|
x0
|
|
|
|
:line_number_separator
|
|
str :
|
|
x20
|
|
x0
|
|
|
|
:strlen
|
|
I=B
|
|
D=B
|
|
:strlen_loop
|
|
C=1I
|
|
?C=0:strlen_ret
|
|
I+=d1
|
|
!:strlen_loop
|
|
:strlen_ret
|
|
I-=D
|
|
A=I
|
|
return
|
|
|
|
; check if strings in rdi and rsi are equal, up to terminator in rcx
|
|
:string=
|
|
D=1I
|
|
A=1J
|
|
?D!A:return_0
|
|
?D=C:return_1
|
|
I+=d1
|
|
J+=d1
|
|
!:string=
|
|
|
|
; check if strings in rdi and rsi are equal, up to the first non-identifier character
|
|
:ident=
|
|
D=1I
|
|
B=D
|
|
call :isident
|
|
; I ended
|
|
?A=0:ident=_I_end
|
|
|
|
D=1J
|
|
B=D
|
|
call :isident
|
|
; J ended, but I didn't
|
|
?A=0:return_0
|
|
|
|
; we haven't reached the end of either
|
|
D=1I
|
|
A=1J
|
|
?D!A:return_0
|
|
I+=d1
|
|
J+=d1
|
|
!:ident=
|
|
:ident=_I_end
|
|
D=1J
|
|
B=D
|
|
call :isident
|
|
; check if J also ended
|
|
?A=0:return_1
|
|
; J didn't end
|
|
!:return_0
|
|
|
|
:return_0
|
|
A=d0
|
|
return
|
|
:return_1
|
|
A=d1
|
|
return
|
|
:return_2
|
|
A=d2
|
|
return
|
|
:return_3
|
|
A=d3
|
|
return
|
|
:return_4
|
|
A=d4
|
|
return
|
|
:return_5
|
|
A=d5
|
|
return
|
|
:return_6
|
|
A=d6
|
|
return
|
|
:return_7
|
|
A=d7
|
|
return
|
|
:return_8
|
|
A=d8
|
|
return
|
|
:return_J
|
|
A=J
|
|
return
|
|
|
|
; write the character in rbx to the file in rdi.
|
|
:fputc
|
|
C=B
|
|
I=S
|
|
I-=d1
|
|
1I=C
|
|
D=d1
|
|
syscall x1
|
|
return
|
|
|
|
; write the string in rbx to stderr
|
|
:eputs
|
|
J=B
|
|
call :strlen
|
|
D=A
|
|
I=J
|
|
J=d2
|
|
syscall x1
|
|
return
|
|
|
|
; write rbx in decimal to stderr
|
|
:eputn
|
|
I=B
|
|
J=S
|
|
J-=d1
|
|
:eputn_loop
|
|
D=d0
|
|
; divide by 10
|
|
B=d10
|
|
A=I
|
|
div
|
|
; quotient is new number
|
|
I=A
|
|
; add remainder to string
|
|
D+='0
|
|
1J=D
|
|
J-=d1
|
|
?I!0:eputn_loop
|
|
D=S
|
|
D-=J
|
|
I=J
|
|
J=d2
|
|
syscall x1
|
|
return
|
|
|
|
; copy rdx bytes from rsi to rdi.
|
|
; this copies from the left: if you're doing an overlapped copy, rsi should be greater than rdi
|
|
:memcpy
|
|
?D=0:return_0
|
|
A=1I
|
|
1J=A
|
|
I+=d1
|
|
J+=d1
|
|
D-=d1
|
|
!:memcpy
|
|
|
|
; copy from rdi to rsi, until byte cl is reached
|
|
:memccpy
|
|
D=1I
|
|
1J=D
|
|
I+=d1
|
|
J+=d1
|
|
?D!C:memccpy
|
|
return
|
|
|
|
:"global"
|
|
str global
|
|
x20
|
|
:"argument"
|
|
str argument
|
|
x20
|
|
:"local"
|
|
str local
|
|
x20
|
|
:"return"
|
|
str return
|
|
x20
|
|
:"function"
|
|
str function
|
|
xa
|
|
|
|
; put a 0 byte before the line (this is important for removing whitespace at the end of the line,
|
|
; specifically, we don't want this to be a space character)
|
|
x0
|
|
:line
|
|
reserve d1000
|
|
|
|
align
|
|
:global_variables_end
|
|
reserve d8
|
|
:static_memory_end
|
|
reserve d8
|
|
:local_variables_end
|
|
reserve d8
|
|
:stack_end
|
|
reserve d8
|
|
:labels_end
|
|
reserve d8
|
|
:line_number
|
|
reserve d8
|
|
:global_variables
|
|
reserve d50000
|
|
:local_variables
|
|
reserve d20000
|
|
:labels
|
|
reserve d200000
|
|
:second_pass
|
|
reserve d1
|
|
|
|
:ELF_header
|
|
x7f
|
|
x45
|
|
x4c
|
|
x46
|
|
x02
|
|
x01
|
|
x01
|
|
|
|
reserve d9
|
|
|
|
x02
|
|
x00
|
|
|
|
x3e
|
|
x00
|
|
|
|
x01
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x78
|
|
x00
|
|
x40
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x40
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
reserve d12
|
|
|
|
x40
|
|
x00
|
|
x38
|
|
x00
|
|
x01
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x01
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x07
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x78
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x78
|
|
x00
|
|
x40
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
reserve d8
|
|
|
|
x00
|
|
x00
|
|
x20
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x00
|
|
x00
|
|
x20
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
x00
|
|
x10
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
x00
|
|
|
|
; NOTE: we shouldn't end the file with a reserve; we don't handle that properly
|