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f0662456ba
* Memory management, Cons, Arrays and String types in types.asm * Functions containing syscall in system.asm * Added more useful error message in reader, on unexpected end of input
120 lines
2.8 KiB
NASM
120 lines
2.8 KiB
NASM
;;
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;; nasm -felf64 step1_read_print.asm && ld step1_read_print.o && ./a.out
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;; Calling convention: Address of input is in RSI
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;; Address of return value is in RAX
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;;
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global _start
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%include "types.asm" ; Data types, memory
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%include "system.asm" ; System calls
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%include "reader.asm" ; String -> Data structures
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%include "printer.asm" ; Data structures -> String
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section .data
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test_string1: db 10, "test1", 10
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.len: equ $ - test_string1
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test_string2: db 10, "test2", 10
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.len: equ $ - test_string2
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;str: ISTRUC Array
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;AT Array.type, db maltype_string
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;AT Array.length, dd 6
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;AT Array.data, db 'hello',10
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;IEND
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test_cons: ISTRUC Cons
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AT Cons.typecar, db ( maltype_integer + 2 )
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AT Cons.typecdr, db 0
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AT Cons.car, dq 123
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IEND
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test_cons2: ISTRUC Cons
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AT Cons.typecar, db ( maltype_integer + 2 )
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AT Cons.typecdr, db content_pointer
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AT Cons.car, dq 456
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AT Cons.cdr, dq test_cons
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IEND
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;; ------------------------------------------
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;; Fixed strings for printing
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prompt_string: db 10,"user> " ; The string to print at the prompt
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.len: equ $ - prompt_string
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section .text
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;; Evaluates a form
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eval:
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mov rax, rsi ; Return the input
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ret
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;; Prints the result
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print:
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mov rax, rsi ; Return the input
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ret
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;; Read-Eval-Print in sequence
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rep_seq:
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call read_str
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mov rsi, rax ; Output of read into input of eval
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call eval
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mov rsi, rax ; Output of eval into input of print
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call print
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mov rsi, rax ; Return value
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ret
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_start:
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; -----------------------------
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; Main loop
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.mainLoop:
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; print the prompt
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mov rdx, prompt_string.len ; number of bytes
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mov rsi, prompt_string ; address of raw string to output
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call print_rawstring
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call read_line
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; Check if we have a zero-length string
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cmp DWORD [rax+Array.length], 0
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je .mainLoopEnd
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push rax ; Save address of the string
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; Put into read_str
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mov rsi, rax
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call read_str
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push rax
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; Put into pr_str
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mov rsi, rax
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call pr_str
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push rax
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mov rsi, rax ; Put into input of print_string
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call print_string
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; Release string from pr_str
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pop rsi
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call release_array
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; Release the object from read_str
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pop rsi
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call release_object ; Could be Cons or Array
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; Release the string
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pop rsi
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call release_array
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jmp .mainLoop
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.mainLoopEnd:
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jmp quit
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