mirror of
https://github.com/kanaka/mal.git
synced 2024-09-21 02:27:10 +03:00
9cb9566897
Merging fixes in stepA into earlier steps, and removing differences in comments and spacing
1694 lines
45 KiB
NASM
1694 lines
45 KiB
NASM
;;
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;; nasm -felf64 step6_file.asm && ld step6_file.o && ./a.out
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;;
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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 "env.asm" ; Environment type
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%include "system.asm" ; System calls
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%include "reader.asm" ; String -> Data structures
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%include "core.asm" ; Core functions
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%include "printer.asm" ; Data structures -> String
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%include "exceptions.asm" ; Error handling
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section .bss
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;; Top-level (REPL) environment
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repl_env:resq 1
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section .data
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;; ------------------------------------------
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;; Fixed strings for printing
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static prompt_string, db 10,"user> " ; The string to print at the prompt
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static error_string, db 27,'[31m',"Error",27,'[0m',": "
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static not_found_string, db " not found"
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static def_missing_arg_string, db "missing argument to def!",10
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static def_expecting_symbol_string, db "expecting symbol as first argument to def!",10
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static let_missing_bindings_string, db "let* missing bindings",10
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static let_bindings_list_string, db "let* expected a list or vector of bindings",10
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static let_bind_symbol_string, db "let* expected a symbol in bindings list",10
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static let_bind_value_string, db "let* missing value in bindings list",10
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static let_missing_body_string, db "let* missing body",10
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static eval_list_not_function, db "list does not begin with a function",10
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static if_missing_condition_string, db "missing condition in if expression",10
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;; Symbols used for comparison
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static_symbol def_symbol, 'def!'
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static_symbol let_symbol, 'let*'
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static_symbol do_symbol, 'do'
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static_symbol if_symbol, 'if'
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static_symbol fn_symbol, 'fn*'
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static_symbol argv_symbol, '*ARGV*'
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;; Startup string. This is evaluated on startup
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static mal_startup_string, db "(do (def! not (fn* (a) (if a false true))) (def! load-file (fn* (f) (eval (read-string (str ",34,"(do",34," (slurp f) ",34,")",34," ))))) )"
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;; Command to run, appending the name of the script to run
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static run_script_string, db "(load-file ",34
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section .text
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;; ----------------------------------------------
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;; Evaluates a form
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;;
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;; Inputs: RSI Form to evaluate
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;; RDI Environment
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;;
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eval_ast:
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mov r15, rdi ; Save Env in r15
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; Check the type
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mov al, BYTE [rsi]
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; Check if this is a list
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mov ah, al
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and ah, container_mask
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cmp ah, container_list
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je .list
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cmp ah, container_map
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je .map
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cmp ah, container_vector
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je .vector
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; Not a list, map or vector
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cmp ah, container_symbol
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je .symbol
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; Not a symbol, list, map or vector
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call incref_object ; Increment reference count
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mov rax, rsi
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ret
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.symbol:
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; Check if first character of symbol is ':'
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mov al, BYTE [rsi + Array.data]
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cmp al, ':'
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je .keyword
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; look in environment
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push rsi
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xchg rsi, rdi
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; symbol is the key in rdi
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; Environment in rsi
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call env_get
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pop rsi
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je .done ; result in RAX
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; Not found, throw an error
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push rsi
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print_str_mac error_string ; print 'Error: '
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pop rsi
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push rsi
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mov edx, [rsi + Array.length]
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add rsi, Array.data
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call print_rawstring ; print symbol
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print_str_mac not_found_string ; print ' not found'
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pop rsi
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jmp error_throw
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; ------------------------------
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.keyword:
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; Just return keywords unaltered
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call incref_object
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mov rax, rsi
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ret
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; ------------------------------
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.list:
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; Evaluate each element of the list
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;
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xor r8, r8 ; The list to return
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; r9 contains head of list
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.list_loop:
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mov al, BYTE [rsi] ; Check type
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mov ah, al
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and ah, content_mask
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cmp ah, content_pointer
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je .list_pointer
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; A value in RSI, so copy
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call alloc_cons
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mov bl, BYTE [rsi]
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and bl, content_mask
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add bl, (block_cons + container_list)
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mov [rax], BYTE bl ; set type
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mov rbx, [rsi + Cons.car]
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mov [rax + Cons.car], rbx ; copy value
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; Result in RAX
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jmp .list_append
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.list_pointer:
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; List element is a pointer to something
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push rsi
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push r8
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push r9
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push r15 ; Env
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mov rdi, [rsi + Cons.car] ; Get the address
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mov rsi, r15
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call incref_object ; Environment increment refs
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xchg rsi, rdi ; Env in RDI, AST in RSI
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call incref_object ; AST increment refs
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call eval ; Evaluate it, result in rax
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pop r15
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pop r9
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pop r8
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pop rsi
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; Check the type it's evaluated to
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mov bl, BYTE [rax]
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mov bh, bl
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and bh, (block_mask + container_mask)
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cmp bh, (block_cons + container_value)
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je .list_eval_value
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; Not a value, so need a pointer to it
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push rax
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call alloc_cons
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mov [rax], BYTE (block_cons + container_list + content_pointer)
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pop rbx ; Address to point to
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mov [rax + Cons.car], rbx
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jmp .list_append
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.list_eval_value:
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; Got value in RAX, so copy
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push rax
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call alloc_cons ; Copy in RAX
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pop rbx ; Value to copy in RBX
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mov cl, BYTE [rbx]
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and cl, content_mask
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or cl, (block_cons + container_list)
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mov [rax], BYTE cl ; set type
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mov rcx, [rbx + Cons.car]
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mov [rax + Cons.car], rcx ; copy value
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; Release the value in RBX
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push rsi
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push rax
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mov rsi, rbx
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call release_cons
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pop rax
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pop rsi
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; Fall through to .list_append
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.list_append:
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; In RAX
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cmp r8, 0 ; Check if this is the first
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je .list_first
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; append to r9
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mov [r9 + Cons.cdr], rax
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mov [r9 + Cons.typecdr], BYTE content_pointer
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mov r9, rax
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jmp .list_next
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.list_first:
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mov r8, rax
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mov r9, rax
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; fall through to .list_next
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.list_next:
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; Check if there's another
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mov al, BYTE [rsi + Cons.typecdr]
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cmp al, content_pointer
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jne .list_done ; finished list
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mov rsi, [rsi + Cons.cdr] ; next in list
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jmp .list_loop
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.list_done:
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mov rax, r8 ; Return the list
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ret
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; ---------------------
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.map:
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; Create a new map, evaluating all the values
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; Check if the map is empty
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cmp al, maltype_empty_map
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jne .map_not_empty
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; map empty. Just return it
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call incref_object
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mov rax, rsi
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ret
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.map_not_empty:
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mov r10, rsi ; input in R10
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xor r12, r12 ; New map in r12
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; Now loop through each key-value pair
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; NOTE: This method relies on the implementation
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; of map as a list
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.map_loop:
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; Copy the key
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call alloc_cons ; New Cons in RAX
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mov bl, [r10 + Cons.typecar] ; Type in BL
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mov [rax + Cons.typecar], bl
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mov rcx, [r10 + Cons.car] ; Value in RCX
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mov [rax + Cons.car], rcx
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; Check the type of the key
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and bl, content_mask
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cmp bl, content_pointer
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jne .map_got_key ; a value
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; a pointer, so increment reference count
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mov bx, WORD [rcx + Cons.refcount]
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inc bx
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mov [rcx + Cons.refcount], WORD bx
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.map_got_key:
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cmp r12,0
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jne .append_key
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; First key
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mov r12, rax
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mov r13, rax
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jmp .map_value
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.append_key:
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; Appending to previous value in r13
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mov [r13 + Cons.typecdr], BYTE content_pointer
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mov [r13 + Cons.cdr], rax
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mov r13, rax
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.map_value:
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; Check that we have a value
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mov al, BYTE [r10 + Cons.typecdr]
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cmp al, content_pointer
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jne .map_error_missing_value
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mov r10, [r10 + Cons.cdr]
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; Now got value in r10
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; Check the type of the value
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mov bl, [r10 + Cons.typecar] ; Type in BL
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and bl, content_mask
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cmp bl, content_pointer
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je .map_value_pointer
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; Not a pointer, so make a copy
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call alloc_cons
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mov bl, [r10 + Cons.typecar]
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mov [rax + Cons.typecar], bl
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mov rcx, [r10 + Cons.car]
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mov [rax + Cons.car], rcx
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jmp .map_got_value
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.map_value_pointer:
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; A pointer, so need to evaluate
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push r10 ; Input
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push r12 ; start of result
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push r13 ; Current head of result
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push r15 ; Env
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mov rsi, [r10 + Cons.car] ; Get the address
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mov rdi, r15
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xchg rsi, rdi
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call incref_object ; Environment increment refs
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xchg rsi, rdi
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call incref_object
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call eval ; Evaluate it, result in rax
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pop r15
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pop r13
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pop r12
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pop r10
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; Check the type it's evaluated to
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mov bl, BYTE [rax]
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mov bh, bl
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and bh, (block_mask + container_mask)
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cmp bh, (block_cons + container_value)
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jne .map_eval_pointer
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; A value, so just change the type to a map
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and bl, content_mask
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add bl, (block_cons + container_map)
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mov [rax], BYTE bl
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jmp .map_got_value
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.map_eval_pointer:
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; Not a value, so need a pointer to it
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push rax
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call alloc_cons
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mov [rax], BYTE (block_cons + container_map + content_pointer)
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pop rbx ; Address to point to
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mov [rax + Cons.car], rbx
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.map_got_value:
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; Append RAX to list in R13
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mov [r13 + Cons.typecdr], BYTE content_pointer
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mov [r13 + Cons.cdr], rax
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mov r13, rax
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; Check if there's another key
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mov al, BYTE [r10 + Cons.typecdr]
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cmp al, content_pointer
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jne .map_done ; finished map
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mov r10, [r10 + Cons.cdr] ; next in map
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jmp .map_loop
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.map_done:
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mov rax, r12
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ret
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.map_error_missing_value:
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mov rax, r12
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ret
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; ------------------------------
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.vector:
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; Evaluate each element of the vector
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;
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xor r8, r8 ; The vector to return
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; r9 contains head of vector
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.vector_loop:
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mov al, BYTE [rsi] ; Check type
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mov ah, al
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and ah, content_mask
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cmp ah, content_pointer
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je .vector_pointer
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; A value, so copy
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call alloc_cons
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mov bl, BYTE [rsi]
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and bl, content_mask
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add bl, (block_cons + container_vector)
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mov [rax], BYTE bl ; set type
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mov rbx, [rsi + Cons.car]
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mov [rax + Cons.car], rbx ; copy value
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; Result in RAX
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jmp .vector_append
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.vector_pointer:
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; Vector element is a pointer to something
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push rsi
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push r8
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push r9
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push r15 ; Env
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mov rsi, [rsi + Cons.car] ; Get the address
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mov rdi, r15
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xchg rsi, rdi
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call incref_object ; Environment increment refs
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xchg rsi, rdi
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call incref_object
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call eval ; Evaluate it, result in rax
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pop r15
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pop r9
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pop r8
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pop rsi
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; Check the type it's evaluated to
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mov bl, BYTE [rax]
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mov bh, bl
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and bh, (block_mask + container_mask)
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cmp bh, (block_cons + container_value)
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je .vector_eval_value
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; Not a value, so need a pointer to it
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push rax
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call alloc_cons
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mov [rax], BYTE (block_cons + container_vector + content_pointer)
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pop rbx ; Address to point to
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mov [rax + Cons.car], rbx
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jmp .vector_append
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.vector_eval_value:
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; Got value in RAX, so copy
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push rax
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call alloc_cons ; Copy in RAX
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pop rbx ; Value to copy in RBX
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mov cl, BYTE [rbx]
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and cl, content_mask
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or cl, (block_cons + container_vector)
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mov [rax], BYTE cl ; set type
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mov rcx, [rbx + Cons.car]
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mov [rax + Cons.car], rcx ; copy value
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; Release the value in RBX
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push rsi
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push rax
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mov rsi, rbx
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call release_cons
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pop rax
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pop rsi
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.vector_append:
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; In RAX
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cmp r8, 0 ; Check if this is the first
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je .vector_first
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; append to r9
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mov [r9 + Cons.cdr], rax
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mov [r9 + Cons.typecdr], BYTE content_pointer
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mov r9, rax
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jmp .vector_next
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.vector_first:
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mov r8, rax
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mov r9, rax
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; fall through to .vector_next
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.vector_next:
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; Check if there's another
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mov al, BYTE [rsi + Cons.typecdr]
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cmp al, content_pointer
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jne .vector_done ; finished vector
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mov rsi, [rsi + Cons.cdr] ; next in vector
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jmp .vector_loop
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.vector_done:
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mov rax, r8 ; Return the vector
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ret
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; ---------------------
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.done:
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ret
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;; Comparison of symbols for eval function
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;; Compares the symbol in RSI with specified symbol
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;; Preserves RSI and RBX
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;; Modifies RDI
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%macro eval_cmp_symbol 1
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push rsi
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push rbx
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mov rsi, rbx
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mov rdi, %1
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call compare_char_array
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pop rbx
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pop rsi
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test rax, rax ; ZF set if rax = 0 (equal)
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%endmacro
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;; ----------------------------------------------------
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;; Evaluates a form
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;;
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;; Input: RSI AST to evaluate [ Released ]
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;; RDI Environment [ Released ]
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;;
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;; Returns: Result in RAX
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;;
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;; Note: Both the form and environment will have their reference count
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;; reduced by one (released). This is for tail call optimisation (Env),
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;; quasiquote and macroexpand (AST)
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;;
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eval:
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mov r15, rdi ; Env
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push rsi ; AST pushed, must be popped before return
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; Check type
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mov al, BYTE [rsi]
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cmp al, maltype_empty_list
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je .return_nil
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and al, container_mask
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cmp al, container_list
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je .list
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; Not a list. Evaluate and return
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call eval_ast
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jmp .return ; Releases Env
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; --------------------
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.list:
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; A list
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; Check if the first element is a symbol
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mov al, BYTE [rsi]
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and al, content_mask
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cmp al, content_pointer
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jne .list_eval
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mov rbx, [rsi + Cons.car]
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mov al, BYTE [rbx]
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cmp al, maltype_symbol
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jne .list_eval
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; Is a symbol, address in RBX
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; Compare against special form symbols
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eval_cmp_symbol def_symbol ; def!
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je .def_symbol
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eval_cmp_symbol let_symbol ; let*
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je .let_symbol
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eval_cmp_symbol do_symbol ; do
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je .do_symbol
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eval_cmp_symbol if_symbol ; if
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je .if_symbol
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eval_cmp_symbol fn_symbol ; fn
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je .fn_symbol
|
|
|
|
; Unrecognised
|
|
jmp .list_eval
|
|
|
|
|
|
; -----------------------------
|
|
|
|
.def_symbol:
|
|
; Define a new symbol in current environment
|
|
|
|
; Next item should be a symbol
|
|
mov al, BYTE [rsi + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .def_error_missing_arg
|
|
mov rsi, [rsi + Cons.cdr]
|
|
|
|
; Now should have a symbol
|
|
|
|
mov al, BYTE [rsi + Cons.typecar]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .def_error_expecting_symbol
|
|
mov r8, [rsi + Cons.car] ; Symbol (?)
|
|
|
|
mov al, BYTE [r8]
|
|
cmp al, maltype_symbol
|
|
jne .def_error_expecting_symbol
|
|
|
|
; R8 now contains a symbol
|
|
|
|
; expecting a value or pointer next
|
|
mov al, BYTE [rsi + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .def_error_missing_arg
|
|
mov rsi, [rsi + Cons.cdr]
|
|
|
|
; Check if this is a pointer
|
|
mov al, BYTE [rsi]
|
|
mov ah, al
|
|
and ah, content_mask
|
|
cmp ah, content_pointer
|
|
je .def_pointer
|
|
|
|
; A value, so copy
|
|
push rax
|
|
call alloc_cons
|
|
pop rbx ; BL now contains type
|
|
and bl, content_mask
|
|
add bl, (block_cons + container_value)
|
|
mov [rax], BYTE bl
|
|
mov rcx, [rsi + Cons.car]
|
|
mov [rax + Cons.car], rcx
|
|
mov rsi, rax
|
|
|
|
jmp .def_got_value
|
|
|
|
.def_pointer:
|
|
; A pointer, so evaluate
|
|
|
|
; This may throw an error, so define a handler
|
|
|
|
push r8 ; the symbol
|
|
push r15 ; Env
|
|
mov rsi, [rsi + Cons.car] ; Pointer
|
|
mov rdi, r15
|
|
|
|
xchg rsi, rdi
|
|
call incref_object ; Environment increment refs
|
|
xchg rsi, rdi ; since it will be decremented by eval
|
|
|
|
call incref_object ; AST increment refs
|
|
|
|
call eval
|
|
mov rsi, rax
|
|
|
|
pop r15
|
|
pop r8
|
|
|
|
.def_got_value:
|
|
; Symbol in R8, value in RSI
|
|
mov rdi, r8 ; key (symbol)
|
|
mov rcx, rsi ; Value
|
|
mov rsi, r15 ; Environment
|
|
call env_set
|
|
|
|
mov rax, rcx
|
|
jmp .return
|
|
|
|
.def_error_missing_arg:
|
|
mov rsi, def_missing_arg_string
|
|
mov rdx, def_missing_arg_string.len
|
|
jmp .def_handle_error
|
|
|
|
.def_error_expecting_symbol:
|
|
mov rsi, def_expecting_symbol_string
|
|
mov rdx, def_expecting_symbol_string.len
|
|
jmp .def_handle_error
|
|
|
|
.def_handle_error:
|
|
push rsi
|
|
push rdx
|
|
print_str_mac error_string ; print 'Error: '
|
|
|
|
pop rdx
|
|
pop rsi
|
|
call print_rawstring ; print message
|
|
|
|
xor rsi, rsi ; no object to throw
|
|
jmp error_throw ; No return
|
|
|
|
; -----------------------------
|
|
.let_symbol:
|
|
; Create a new environment
|
|
|
|
mov r11, rsi ; Let form in R11
|
|
|
|
mov rsi, r15 ; Outer env
|
|
call env_new ; Increments R15's ref count
|
|
mov r14, rax ; New environment in R14
|
|
|
|
mov rsi, r15
|
|
call release_object ; Decrement R15 ref count
|
|
|
|
; Second element should be the bindings
|
|
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .let_error_missing_bindings
|
|
mov r11, [r11 + Cons.cdr]
|
|
|
|
mov al, BYTE [r11]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .let_error_bindings_list
|
|
|
|
mov r12, [r11 + Cons.car] ; should be bindings list
|
|
mov al, BYTE [r12]
|
|
and al, (block_mask + container_mask)
|
|
; Can be either a list or vector
|
|
cmp al, block_cons + container_list
|
|
je .let_bind_loop
|
|
cmp al, block_cons + container_vector
|
|
je .let_bind_loop
|
|
|
|
; Not a list or vector
|
|
jmp .let_error_bindings_list
|
|
|
|
.let_bind_loop:
|
|
; R12 now contains a list with an even number of items
|
|
; The first should be a symbol, then a value to evaluate
|
|
|
|
; Get the symbol
|
|
mov al, BYTE [r12]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .let_error_bind_symbol
|
|
|
|
mov r13, [r12 + Cons.car] ; Symbol (?)
|
|
mov al, BYTE [r13]
|
|
cmp al, maltype_symbol
|
|
jne .let_error_bind_symbol
|
|
|
|
; R13 now contains a symbol to bind
|
|
; The next item in the bindings list (R12)
|
|
; should be a value or expression to evaluate
|
|
|
|
mov al, BYTE [r12 + Cons.typecdr]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .let_error_bind_value
|
|
mov r12, [r12 + Cons.cdr]
|
|
|
|
; got value in R12
|
|
|
|
; Check the type of the value
|
|
mov bl, [r12 + Cons.typecar] ; Type in BL
|
|
and bl, content_mask
|
|
cmp bl, content_pointer
|
|
je .let_value_pointer
|
|
|
|
; Not a pointer, so make a copy
|
|
call alloc_cons
|
|
mov bl, [r12 + Cons.typecar]
|
|
and bl, content_mask
|
|
;or bl, (block_cons + container_value) ; 0
|
|
mov [rax + Cons.typecar], bl
|
|
mov rcx, [r12 + Cons.car]
|
|
mov [rax + Cons.car], rcx
|
|
|
|
jmp .let_got_value
|
|
|
|
.let_value_pointer:
|
|
; A pointer, so need to evaluate
|
|
push r11 ; let* form list
|
|
push r12 ; Position in bindings list
|
|
push r13 ; symbol to bind
|
|
push r14 ; new environment
|
|
|
|
mov rsi, r14
|
|
call incref_object
|
|
mov rdi, r14
|
|
|
|
mov rsi, [r12 + Cons.car] ; Get the address
|
|
|
|
call incref_object ; Increment ref count of AST
|
|
|
|
call eval ; Evaluate it, result in rax
|
|
pop r14
|
|
pop r13
|
|
pop r12
|
|
pop r11
|
|
|
|
.let_got_value:
|
|
|
|
mov rsi, r14 ; Env
|
|
mov rdi, r13 ; key
|
|
mov rcx, rax ; value
|
|
call env_set
|
|
|
|
; Release the value
|
|
mov rsi, rcx ; The value
|
|
call release_object
|
|
|
|
; Check if there are more bindings
|
|
mov al, BYTE [r12 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .let_done_binding
|
|
mov r12, [r12 + Cons.cdr] ; Next
|
|
jmp .let_bind_loop
|
|
|
|
.let_done_binding:
|
|
; Done bindings.
|
|
; Evaluate next item in let* form in new environment
|
|
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .let_error_missing_body
|
|
mov r11, [r11 + Cons.cdr] ; Now contains value to evaluate
|
|
; Check type of the value
|
|
mov al, BYTE [r11]
|
|
and al, block_mask + content_mask
|
|
cmp al, content_pointer
|
|
je .body_pointer
|
|
|
|
; Just a value, so copy
|
|
call alloc_cons
|
|
mov bl, BYTE [r11]
|
|
and bl, content_mask
|
|
mov [rax], BYTE bl ; set type
|
|
mov rbx, [r11 + Cons.car]
|
|
mov [rax + Cons.car], rbx ; copy value
|
|
jmp .let_done
|
|
|
|
.body_pointer:
|
|
; Evaluate using new environment
|
|
|
|
mov rsi, [r11 + Cons.car] ; Object pointed to
|
|
call incref_object ; will be released by eval
|
|
|
|
mov r11, rsi ; save new AST
|
|
pop rsi ; Old AST
|
|
call release_object
|
|
mov rsi, r11 ; New AST
|
|
|
|
mov rdi, r14 ; New environment
|
|
|
|
jmp eval ; Tail call
|
|
; Note: eval will release the new environment on return
|
|
|
|
.let_done:
|
|
; Release the new environment
|
|
push rax
|
|
mov rsi, r14
|
|
call release_object
|
|
pop rax
|
|
|
|
; Release the AST
|
|
pop rsi
|
|
push rax
|
|
call release_object
|
|
pop rax
|
|
ret ; already released env
|
|
|
|
.let_error_missing_bindings:
|
|
mov rsi, let_missing_bindings_string
|
|
mov rdx, let_missing_bindings_string.len
|
|
jmp .let_handle_error
|
|
|
|
.let_error_bindings_list: ; expected a list or vector, got something else
|
|
mov rsi, let_bindings_list_string
|
|
mov rdx, let_bindings_list_string.len
|
|
jmp .let_handle_error
|
|
|
|
.let_error_bind_symbol: ; expected a symbol, got something else
|
|
mov rsi, let_bind_symbol_string
|
|
mov rdx, let_bind_symbol_string.len
|
|
jmp .let_handle_error
|
|
|
|
.let_error_bind_value: ; Missing value in binding list
|
|
mov rsi, let_bind_value_string
|
|
mov rdx, let_bind_value_string.len
|
|
jmp .let_handle_error
|
|
|
|
.let_error_missing_body: ; Missing body to evaluate
|
|
mov rsi, let_missing_body_string
|
|
mov rdx, let_missing_body_string.len
|
|
jmp .let_handle_error
|
|
|
|
.let_handle_error:
|
|
push r11 ; For printing later
|
|
|
|
push rsi
|
|
push rdx
|
|
|
|
print_str_mac error_string ; print 'Error: '
|
|
|
|
pop rdx
|
|
pop rsi
|
|
call print_rawstring ; print message
|
|
|
|
pop rsi ; let* form
|
|
jmp error_throw ; No return
|
|
|
|
; -----------------------------
|
|
|
|
.do_symbol:
|
|
mov r11, rsi ; do form in RSI
|
|
; Environment in R15
|
|
|
|
; Check if there is a body
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .do_no_body ; error
|
|
|
|
mov r11, [r11 + Cons.cdr] ; Body in R11
|
|
|
|
.do_symbol_loop:
|
|
|
|
; Need to test if this is the last form
|
|
; so we can handle tail call
|
|
|
|
mov bl, BYTE [r11 + Cons.typecdr]
|
|
cmp bl, content_pointer
|
|
jne .do_body_last ; Last expression
|
|
|
|
; not the last expression
|
|
|
|
; Check if this is a value or pointer
|
|
mov al, BYTE [r11]
|
|
and al, block_mask + content_mask
|
|
cmp al, content_pointer
|
|
jne .do_next ; A value, so skip
|
|
|
|
; A pointer, so evaluate
|
|
|
|
push r15
|
|
push r11
|
|
|
|
mov rsi, r15
|
|
call incref_object ; Increase Env reference
|
|
; since eval will release Env
|
|
|
|
mov rsi, [r11 + Cons.car] ; Form
|
|
call incref_object ; Increment ref count since eval will release
|
|
|
|
mov rdi, r15 ; Env
|
|
call eval ; Result in RAX
|
|
|
|
; Another form after this.
|
|
; Discard the result of the last eval
|
|
mov rsi, rax
|
|
call release_object
|
|
|
|
pop r11
|
|
pop r15
|
|
|
|
.do_next:
|
|
mov r11, [r11 + Cons.cdr] ; Next in list
|
|
|
|
jmp .do_symbol_loop
|
|
|
|
.do_body_last:
|
|
; The last form is in R11, which will be returned
|
|
|
|
; Check if this is a value or pointer
|
|
mov al, BYTE [r11]
|
|
and al, block_mask + content_mask
|
|
cmp al, content_pointer
|
|
jne .do_body_value_return
|
|
jmp .do_body_expr_return
|
|
|
|
.do_body_value_return:
|
|
; Got a value as last form (in R11).
|
|
; Copy and return
|
|
|
|
push rax ; Type of value to return
|
|
|
|
; release Env
|
|
mov rsi, r15
|
|
call release_object
|
|
|
|
; Allocate a Cons object to hold value
|
|
call alloc_cons
|
|
pop rbx ; type in BL
|
|
mov [rax], BYTE bl
|
|
mov rbx, [r11 + Cons.car]
|
|
mov [rax + Cons.car], rbx
|
|
|
|
; release the AST
|
|
pop rsi
|
|
mov r15, rax ; not modified by release
|
|
call release_object
|
|
mov rax, r15
|
|
|
|
ret
|
|
|
|
.do_body_expr_return:
|
|
; An expression to evaluate as the last form
|
|
; Tail call optimise, jumping to eval
|
|
; Don't increment Env reference count
|
|
|
|
mov rsi, [r11 + Cons.car] ; new AST form
|
|
call incref_object ; This will be released by eval
|
|
|
|
mov r11, rsi ; Save new AST
|
|
pop rsi ; Remove old AST from stack
|
|
call release_object
|
|
mov rsi, r11
|
|
|
|
mov rdi, r15 ; Env
|
|
jmp eval ; Tail call
|
|
|
|
.do_no_body:
|
|
; No expressions to evaluate. Return nil
|
|
|
|
mov rsi, r15
|
|
call release_object ; Release Env
|
|
|
|
; release the AST
|
|
pop rsi
|
|
call release_object
|
|
|
|
call alloc_cons
|
|
mov [rax], BYTE maltype_nil
|
|
mov [rax + Cons.typecdr], BYTE content_nil
|
|
ret
|
|
|
|
; -----------------------------
|
|
|
|
.if_symbol:
|
|
mov r11, rsi ; if form in R11
|
|
; Environment in R15
|
|
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .if_no_condition
|
|
|
|
mov r11, [r11 + Cons.cdr] ; Should be a condition
|
|
|
|
; Check if value or pointer
|
|
mov al, BYTE [r11]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .if_cond_value
|
|
|
|
; A pointer, so evaluate
|
|
|
|
push r15
|
|
push r11
|
|
|
|
mov rsi, r15
|
|
call incref_object ; Increase Env reference
|
|
|
|
mov rsi, [r11 + Cons.car] ; Form
|
|
call incref_object ; Increase Form/AST ref count
|
|
|
|
mov rdi, r15 ; Env
|
|
call eval ; Result in RAX
|
|
pop r11
|
|
pop r15
|
|
|
|
; Get type of result
|
|
mov bl, BYTE [rax]
|
|
|
|
; release value
|
|
push rbx
|
|
mov rsi, rax
|
|
call release_object
|
|
pop rbx
|
|
|
|
; Check type
|
|
cmp bl, maltype_nil
|
|
je .if_false
|
|
cmp bl, maltype_false
|
|
je .if_false
|
|
|
|
jmp .if_true
|
|
|
|
.if_cond_value:
|
|
|
|
; A value
|
|
cmp al, content_nil
|
|
je .if_false
|
|
cmp al, content_false
|
|
je .if_false
|
|
|
|
jmp .if_true
|
|
|
|
.if_false:
|
|
; Skip the next item
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .return_nil
|
|
|
|
mov r11, [r11 + Cons.cdr]
|
|
|
|
.if_true:
|
|
; Get the next item in the list and evaluate it
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .return_nil ; Nothing to return
|
|
|
|
mov r11, [r11 + Cons.cdr]
|
|
|
|
; Check if value or pointer
|
|
mov al, BYTE [r11]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
je .if_got_pointer
|
|
|
|
.if_got_value:
|
|
; copy value in r11
|
|
call alloc_cons
|
|
mov bl, BYTE [r11]
|
|
and bl, content_mask
|
|
mov [rax], BYTE bl
|
|
mov rbx, [r11 + Cons.car]
|
|
mov [rax + Cons.car], rbx
|
|
|
|
jmp .return
|
|
|
|
.if_got_pointer:
|
|
mov rsi, [r11 + Cons.car] ; Form
|
|
call incref_object ; Will be released by eval
|
|
|
|
mov r11, rsi
|
|
pop rsi
|
|
call release_object ; Release old AST
|
|
mov rsi, r11 ; New AST
|
|
|
|
mov rdi, r15 ; Env
|
|
jmp eval ; Tail call
|
|
|
|
.if_no_condition: ; just (if) without a condition
|
|
|
|
print_str_mac error_string
|
|
print_str_mac if_missing_condition_string
|
|
|
|
; Release environment
|
|
mov rsi, r15
|
|
call release_object
|
|
xor rsi, rsi ; No object to throw
|
|
jmp error_throw
|
|
|
|
.return_nil:
|
|
call alloc_cons
|
|
mov [rax], BYTE maltype_nil
|
|
mov [rax + Cons.typecdr], BYTE content_nil
|
|
|
|
.return:
|
|
; Release environment
|
|
mov rsi, r15
|
|
mov r15, rax ; Save RAX (return value)
|
|
call release_object
|
|
|
|
; Release the AST
|
|
pop rsi ; Pushed at start of eval
|
|
call release_object
|
|
|
|
mov rax, r15 ; return value
|
|
ret
|
|
|
|
; -----------------------------
|
|
|
|
.fn_symbol:
|
|
mov r11, rsi ; fn form in R11
|
|
; Environment in R15
|
|
|
|
; Get the binds and body of the function
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .fn_empty
|
|
|
|
mov r11, [r11 + Cons.cdr]
|
|
mov al, BYTE [r11]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .fn_binds_not_list
|
|
|
|
mov r12, [r11 + Cons.car] ; Should be binds list
|
|
mov al, BYTE [r12]
|
|
and al, (block_mask + container_mask)
|
|
cmp al, (block_cons + container_list)
|
|
je .fn_got_binds ; Can be list
|
|
cmp al, (block_cons + container_vector)
|
|
je .fn_got_binds ; or vector
|
|
jmp .fn_binds_not_list
|
|
|
|
.fn_got_binds:
|
|
|
|
; Next get the body of the function
|
|
mov al, BYTE [r11 + Cons.typecdr]
|
|
cmp al, content_pointer
|
|
jne .fn_no_body
|
|
|
|
mov r11, [r11 + Cons.cdr]
|
|
; Check value or pointer
|
|
mov al, BYTE [r11]
|
|
and al, content_mask
|
|
cmp al, content_pointer
|
|
jne .fn_is_value ; Body in r11
|
|
mov r11, [r11 + Cons.car]
|
|
jmp .fn_got_body
|
|
|
|
.fn_is_value:
|
|
; Body is just a value, no expression
|
|
mov [r11], BYTE al ; Mark as value, not list
|
|
|
|
.fn_got_body:
|
|
|
|
; Now put into function type
|
|
; Addr is "apply_fn", the address to call
|
|
; Env in R15
|
|
; Binds in R12
|
|
; Body in R11
|
|
|
|
call alloc_cons
|
|
mov [rax], BYTE (block_cons + container_function + content_function)
|
|
mov rbx, apply_fn
|
|
mov [rax + Cons.car], rbx ; Address of apply function
|
|
mov [rax + Cons.typecdr], BYTE content_pointer
|
|
|
|
mov r13, rax ; Return list in R13
|
|
|
|
call alloc_cons
|
|
mov [rax], BYTE (block_cons + container_function + content_pointer)
|
|
mov [rax + Cons.car], r15 ; Environment
|
|
mov [rax + Cons.typecdr], BYTE content_pointer
|
|
|
|
mov [r13 + Cons.cdr], rax ; Append to list
|
|
mov r14, rax
|
|
|
|
push rax
|
|
mov rsi, r15
|
|
call incref_object
|
|
pop rax
|
|
|
|
; Binds
|
|
|
|
call alloc_cons
|
|
mov [rax], BYTE (block_cons + container_function + content_pointer)
|
|
mov [rax + Cons.car], r12 ; Binds list
|
|
mov [rax + Cons.typecdr], BYTE content_pointer
|
|
|
|
mov [r14 + Cons.cdr], rax ; Append to list
|
|
mov r14, rax
|
|
|
|
push rax
|
|
mov rsi, r12
|
|
call incref_object
|
|
pop rax
|
|
|
|
call alloc_cons
|
|
mov [rax], BYTE (block_cons + container_function + content_pointer)
|
|
mov [rax + Cons.car], r11 ; Body of function
|
|
|
|
mov [r14 + Cons.cdr], rax
|
|
|
|
mov rsi, r11
|
|
call incref_object
|
|
|
|
mov rax, r13
|
|
jmp .return
|
|
|
|
.fn_empty:
|
|
.fn_binds_not_list:
|
|
.fn_no_body:
|
|
|
|
call alloc_cons
|
|
mov [rax], BYTE maltype_nil
|
|
mov [rax + Cons.typecdr], BYTE content_nil
|
|
jmp .return
|
|
|
|
|
|
; -----------------------------
|
|
|
|
.list_eval:
|
|
push rsi
|
|
mov rdi, r15 ; Environment
|
|
push r15
|
|
call eval_ast ; List of evaluated forms in RAX
|
|
pop r15
|
|
pop rsi
|
|
|
|
.list_exec:
|
|
; This point can be called to run a function
|
|
; used by swap!
|
|
;
|
|
; Inputs: RAX - List with function as first element
|
|
; NOTE: This list is released
|
|
;
|
|
; Check that the first element of the return is a function
|
|
mov bl, BYTE [rax]
|
|
and bl, content_mask
|
|
cmp bl, content_pointer
|
|
jne .list_not_function
|
|
|
|
mov rbx, [rax + Cons.car] ; Get the address
|
|
mov cl, BYTE [rbx]
|
|
cmp cl, maltype_function
|
|
jne .list_not_function
|
|
|
|
; Check the rest of the args
|
|
mov cl, BYTE [rax + Cons.typecdr]
|
|
cmp cl, content_pointer
|
|
je .list_got_args
|
|
|
|
; No arguments
|
|
|
|
push rbx ; Function object
|
|
|
|
mov rsi, rax ; List with function first
|
|
call release_object ; Can be freed now
|
|
|
|
; Create an empty list for the arguments
|
|
call alloc_cons
|
|
mov [rax], BYTE maltype_empty_list
|
|
|
|
pop rbx
|
|
mov rsi, rax
|
|
jmp .list_function_call
|
|
.list_got_args:
|
|
mov rsi, [rax + Cons.cdr] ; Rest of list
|
|
.list_function_call:
|
|
; Call the function with the rest of the list in RSI
|
|
|
|
mov rdx, rax ; List to release
|
|
mov rdi, rbx ; Function object in RDI
|
|
|
|
mov rbx, [rbx + Cons.car] ; Call function
|
|
cmp rbx, apply_fn
|
|
je apply_fn_jmp ; Jump to user function apply
|
|
|
|
; A built-in function, so call (no recursion)
|
|
push rax
|
|
push r15
|
|
|
|
call rbx
|
|
|
|
; Result in rax
|
|
pop r15
|
|
pop rsi ; eval'ed list
|
|
|
|
push rax
|
|
call release_cons
|
|
pop rax
|
|
jmp .return ; Releases Env
|
|
|
|
.list_not_function:
|
|
; Not a function. Probably an error
|
|
push rsi
|
|
|
|
mov rsi, rax
|
|
call release_object
|
|
|
|
print_str_mac error_string
|
|
print_str_mac eval_list_not_function
|
|
pop rsi
|
|
jmp error_throw
|
|
|
|
|
|
;; Applies a user-defined function
|
|
;;
|
|
;; Input: RSI - Arguments to bind
|
|
;; RDI - Function object
|
|
;; RDX - list to release after binding
|
|
;; R15 - Env (will be released)
|
|
;; R13 - AST released before return
|
|
;;
|
|
;;
|
|
;; Output: Result in RAX
|
|
;;
|
|
;; This is jumped to from eval, so if it returns
|
|
;; then it will return to the caller of eval, not to eval
|
|
apply_fn_jmp:
|
|
; This is jumped to from eval with AST on the stack
|
|
pop r13
|
|
apply_fn:
|
|
push rsi
|
|
; Extract values from the list in RDI
|
|
mov rax, [rdi + Cons.cdr]
|
|
mov rsi, [rax + Cons.car] ; Env
|
|
mov rax, [rax + Cons.cdr]
|
|
mov rdi, [rax + Cons.car] ; Binds
|
|
mov rax, [rax + Cons.cdr]
|
|
mov rax, [rax + Cons.car] ; Body
|
|
pop rcx ; Exprs
|
|
|
|
; Check the type of the body
|
|
mov bl, BYTE [rax]
|
|
and bl, block_mask + container_mask
|
|
jnz .bind
|
|
; Just a value (in RAX). No eval needed
|
|
|
|
mov r14, rax ; Save return value in R14
|
|
|
|
mov rsi, rax
|
|
call incref_object
|
|
|
|
; Release the list passed in RDX
|
|
mov rsi, rdx
|
|
call release_object
|
|
|
|
; Release the environment
|
|
mov rsi, r15
|
|
call release_object
|
|
|
|
; Release the AST
|
|
mov rsi, r13
|
|
call release_object
|
|
|
|
mov rax, r14
|
|
ret
|
|
.bind:
|
|
; Create a new environment, binding arguments
|
|
push rax ; Body
|
|
|
|
mov r14, r13 ; Old AST. R13 used by env_new_bind
|
|
|
|
push rdx
|
|
call env_new_bind
|
|
pop rdx
|
|
|
|
mov rdi, rax ; New environment in RDI
|
|
|
|
; Note: Need to increment the reference count
|
|
; of the function body before releasing anything,
|
|
; since if the function was defined in-place (lambda)
|
|
; then the body may be released early
|
|
|
|
pop rsi ; Body
|
|
call incref_object ; Will be released by eval
|
|
mov r8, rsi ; Body in R8
|
|
|
|
; Release the list passed in RDX
|
|
mov rsi, rdx
|
|
call release_cons
|
|
|
|
; Release the environment
|
|
mov rsi, r15
|
|
call release_object
|
|
|
|
; Release the old AST
|
|
mov rsi, r14
|
|
call release_object
|
|
|
|
mov rsi, r8 ; Body
|
|
|
|
jmp eval ; Tail call
|
|
; The new environment (in RDI) will be released by eval
|
|
|
|
;; Read and eval
|
|
read_eval:
|
|
; -------------
|
|
; Read
|
|
call read_str
|
|
|
|
; -------------
|
|
; Eval
|
|
mov rsi, rax ; Form to evaluate
|
|
mov rdi, [repl_env] ; Environment
|
|
|
|
xchg rsi, rdi
|
|
call incref_object ; Environment increment refs
|
|
xchg rsi, rdi ; since it will be decremented by eval
|
|
|
|
jmp eval ; This releases Env and Form/AST
|
|
|
|
|
|
;; Read-Eval-Print in sequence
|
|
;;
|
|
;; Input string in RSI
|
|
rep_seq:
|
|
; -------------
|
|
; Read
|
|
call read_str
|
|
|
|
; -------------
|
|
; Eval
|
|
mov rsi, rax ; Form to evaluate
|
|
mov rdi, [repl_env] ; Environment
|
|
|
|
xchg rsi, rdi
|
|
call incref_object ; Environment increment refs
|
|
xchg rsi, rdi ; since it will be decremented by eval
|
|
|
|
call eval ; This releases Env and Form/AST
|
|
push rax ; Save result of eval
|
|
|
|
; -------------
|
|
; Print
|
|
|
|
mov rsi, rax ; Output of eval into input of print
|
|
mov rdi, 1 ; print readably
|
|
call pr_str ; String in RAX
|
|
|
|
mov r8, rax ; Save output
|
|
|
|
pop rsi ; Result from eval
|
|
call release_object
|
|
mov rax, r8
|
|
|
|
ret
|
|
|
|
|
|
_start:
|
|
; Create and print the core environment
|
|
call core_environment ; Environment in RAX
|
|
|
|
mov [repl_env], rax ; store in memory
|
|
|
|
; Set the error handler
|
|
mov rsi, rsp ; Stack pointer
|
|
mov rdi, .catch ; Address to jump to
|
|
xor rcx, rcx ; No data
|
|
call error_handler_push
|
|
|
|
; Evaluate the startup string
|
|
|
|
mov rsi, mal_startup_string
|
|
mov edx, mal_startup_string.len
|
|
call raw_to_string ; String in RAX
|
|
|
|
push rax
|
|
mov rsi, rax
|
|
call read_str ; AST in RAX
|
|
pop rsi ; string
|
|
|
|
push rax ; AST
|
|
call release_array ; string
|
|
pop rdi ; AST in RDI
|
|
|
|
mov rsi, [repl_env] ; Environment in RSI
|
|
|
|
call incref_object ; Environment increment refs
|
|
xchg rsi, rdi ; Env in RDI, AST in RSI
|
|
|
|
call eval
|
|
|
|
mov rsi, rax
|
|
call release_object ; Return from eval
|
|
|
|
; -----------------------------
|
|
; Check command-line arguments
|
|
|
|
pop rax ; Number of arguments
|
|
cmp rax, 1 ; Always have at least one, the path to executable
|
|
jg run_script
|
|
|
|
; No extra arguments, so just set *ARGV* to an empty list
|
|
call alloc_cons ; in RAX
|
|
mov [rax], BYTE maltype_empty_list
|
|
mov rcx, rax ; value (empty list)
|
|
mov rdi, argv_symbol ; symbol (*ARGV*)
|
|
mov rsi, [repl_env] ; environment
|
|
call env_set
|
|
|
|
; -----------------------------
|
|
; Main loop
|
|
|
|
.mainLoop:
|
|
; print the prompt
|
|
print_str_mac prompt_string
|
|
|
|
call read_line
|
|
|
|
; Check if we have a zero-length string
|
|
cmp DWORD [rax+Array.length], 0
|
|
je .mainLoopEnd
|
|
|
|
push rax ; Save address of the string
|
|
|
|
mov rsi, rax
|
|
call rep_seq ; Read-Eval-Print
|
|
|
|
push rax ; Save returned string
|
|
|
|
mov rsi, rax ; Put into input of print_string
|
|
call print_string
|
|
|
|
; Release string from rep_seq
|
|
pop rsi
|
|
call release_array
|
|
|
|
; Release the input string
|
|
pop rsi
|
|
call release_array
|
|
|
|
jmp .mainLoop
|
|
.mainLoopEnd:
|
|
|
|
jmp quit
|
|
|
|
.catch:
|
|
; Jumps here on error
|
|
|
|
; Check if an object was thrown
|
|
cmp rsi, 0
|
|
je .catch_done_print ; nothing to print
|
|
mov rdi, 1
|
|
call pr_str
|
|
mov rsi, rax
|
|
call print_string
|
|
.catch_done_print:
|
|
jmp .mainLoop ; Go back to the prompt
|
|
|
|
|
|
|
|
run_script:
|
|
; Called with number of command-line arguments in RAX
|
|
mov r8, rax
|
|
pop rbx ; executable
|
|
dec r8
|
|
|
|
pop rsi ; Address of first arg
|
|
call cstring_to_string ; string in RAX
|
|
mov r9, rax
|
|
|
|
; get the rest of the args
|
|
xor r10, r10 ; Zero
|
|
dec r8
|
|
jz .no_args
|
|
|
|
; Got some arguments
|
|
.arg_loop:
|
|
; Got an argument left.
|
|
pop rsi ; Address of C string
|
|
call cstring_to_string ; String in RAX
|
|
mov r12, rax
|
|
|
|
;Make a Cons to point to the string
|
|
call alloc_cons ; in RAX
|
|
mov [rax], BYTE (block_cons + container_list + content_pointer)
|
|
mov [rax + Cons.car], r12
|
|
|
|
test r10, r10
|
|
jnz .append
|
|
|
|
; R10 zero, so first arg
|
|
mov r10, rax ; Head of list
|
|
mov r11, rax ; Tail of list
|
|
jmp .next
|
|
.append:
|
|
; R10 not zero, so append to list tail
|
|
mov [r11 + Cons.cdr], rax
|
|
mov [r11 + Cons.typecdr], BYTE content_pointer
|
|
mov r11, rax
|
|
.next:
|
|
dec r8
|
|
jnz .arg_loop
|
|
jmp .got_args
|
|
|
|
.no_args:
|
|
; No arguments. Create an emoty list
|
|
call alloc_cons ; in RAX
|
|
mov [rax], BYTE maltype_empty_list
|
|
mov r10, rax
|
|
|
|
.got_args:
|
|
push r9 ; File name string
|
|
|
|
mov rcx, r10 ; value (list)
|
|
mov rdi, argv_symbol ; symbol (*ARGV*)
|
|
mov rsi, [repl_env] ; environment
|
|
call env_set
|
|
|
|
mov rsi, run_script_string ; load-file function
|
|
mov edx, run_script_string.len
|
|
call raw_to_string ; String in RAX
|
|
|
|
mov rsi, rax
|
|
pop rdx ; File name string
|
|
call string_append_string
|
|
|
|
mov cl, 34 ; "
|
|
call string_append_char
|
|
mov cl, ')'
|
|
call string_append_char ; closing brace
|
|
|
|
; Read-Eval "(load-file <file>)"
|
|
call read_eval
|
|
|
|
jmp quit
|