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Backend.fs
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module Backend
open System.Runtime.InteropServices
open StackMachine
let isLinux = RuntimeInformation.IsOSPlatform(OSPlatform.Linux)
let isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
let isOSX = RuntimeInformation.IsOSPlatform(OSPlatform.OSX)
type operand = string
// 按W64/AMD调用约定计算偏移
let arg_loc (n: int) : operand =
if isWindows then
(match n with
| 0 -> "rcx"
| 1 -> "rdx"
| 2 -> "r08"
| 3 -> "r09"
| _ -> $"qword [rbx + {8 * (n + 2)}]")
else
(match n with
| 0 -> "rdi"
| 1 -> "rsi"
| 2 -> "rdx"
| 3 -> "rcx"
| 4 -> "r08"
| 5 -> "r09"
| _ -> $"qword [rbx + {8 * (n - 4)}]")
let new_label =
let i = ref 0 in
let get () =
let v = i.Value in
i.Value <- i.Value + 1
".Lasm" + (string v)
get
let x86header =
"\nextern printi\n"
+ "extern printc\n"
+ "extern checkargc\n"
+ "global asm_main\n"
+ "default rel\n"
+ "section .data\n"
+ "glovars: dq 0\n"
+ "section .text\n"
let beforeinit argc =
"asm_main:\n"
+ "\tpush rbp\n"
+ "\tmov qword [glovars], rsp\n"
+ "\tsub qword [glovars], 8\n"
+ $"\tpush {arg_loc 1} ;save asm_main args\n"
+ $"\tpush {arg_loc 0}\n"
+ "\t;check arg count:\n"
+ "\tsub rsp, 24\n"
+ $"\tmov {arg_loc 1}, {arg_loc 0}\n"
+ $"\tmov {arg_loc 0}, {string (argc)}\n"
+ "\tcall checkargc\n"
+ "\tadd rsp, 24\n"
+ $"\tpop {arg_loc 0}\n"
+ $"\tpop {arg_loc 1} ;pop asm_main args\n"
+ "\t; allocate globals:\n\t"
let prog = string
let rec emitx86 instr =
match instr with
| Label lab -> $"\n{lab}:\n\t"
| FLabel (m, lab) ->
$"\n{lab}:\n\t\
pop rax ; retaddr\n\t\
pop r10 ; oldbp \n\t\
sub rsp, 16 ; make space for svm r,bp \n\t\
mov rsi, rsp \n\t\
mov rbp, rsp \n\t\
add rbp, {8 * m} ; 8*arity \n\n\
_{lab}_pro_1: ; slide 2 stack slot\n\t\
cmp rbp, rsi \n\t\
jz _{lab}_pro_2 \n\t\
mov rcx, [rsi+16] \n\t\
mov [rsi], rcx \n\t\
add rsi, 8 \n\t\
jmp _{lab}_pro_1 \n\n\
_{lab}_pro_2: \n\t\
sub rbp, 8 ; rbp pointer to first arg \n\t\
mov [rbp+16], rax ; set retaddr \n\t\
mov [rbp+8], r10 ; set oldbp\n\t"
| CSTI i ->
$";CSTI {i}\n\t\
push {i}\n\t"
| GVAR i ->
$";GVAR {i}\n\t\
mov rax ,qword [glovars]\n\t\
sub rax , {i}*8\n\t\
push rax\n\t"
| OFFSET i ->
$";OFFSET {i}\n\t\
push -{i * 8}\n\t" // SVM 与x86栈的增长方向相反
| ADD ->
";ADD\n\t\
pop rax\n\t\
pop r10\n\t\
add rax, r10\n\t\
push rax\n\t"
| SUB ->
";SUB\n\t\
pop r10\n\t\
pop rax\n\t\
sub rax,r10\n\t\
push rax\n\t"
| MUL ->
";MUL\n\t\
pop rax\n\t\
pop r10\n\t\
imul r10\n\t\
push rax\n\t"
| DIV ->
";DIV\n\t\
pop r10\n\t\
pop rax\n\t\
cqto\n\t\
idiv r10\n\t\
push rax\n\t"
| MOD ->
";MOD\n\t\
xor rdx,rdx\n\t\
pop rcx\n\t\
pop rax\n\t\
idiv rcx\n\t\
push rdx\n\t"
| EQ ->
let (l1, l2) = (new_label (), new_label ())
$";EQ\n\t\
pop rax\n\t\
pop r10\n\t\
cmp rax, r10\n\t\
jne {l1}\n\t\
push 1\n\t\
jmp {l2}\n\
{l1}:\n\t\
push 0\n\
{l2}:\n\t"
| LT ->
let (l1, l2) = (new_label (), new_label ())
$";LT\n\t\
pop rax\n\t\
pop r10\n\t\
cmp r10, rax\n\t\
jl {l1}\n\t\
push 0\n\t\
jmp {l2}\n\
{l1}:\n\t\
push 1\n\
{l2}:\n\t"
| NOT ->
$";NOT\n\t\
pop rax\n\t\
xor rax, 1\n\t\
push rax\n\t"
| DUP ->
$";DUP\n\t\
pop rax\n\t\
push rax\n\t\
push rax\n\t"
| SWAP ->
$";SWAP\n\t\
pop rax\n\t\
pop r10\n\t\
push rax\n\t\
push r10\n\t"
| LDI ->
$";LDI\n\t\
pop rax\n\t\
mov rax,[rax]\n\t\
push rax\n\t"
| STI ->
$";STI\n\t\
pop r10\n\t\
pop rax\n\t\
mov [rax],r10\n\t\
push r10\n\t"
| GETBP ->
$";GETBP\n\t\
push rbp\n\t"
| GETSP ->
$";GETSP\n\t\
push rsp\n\t"
| INCSP m ->
$";INCSP {m}\n\t\
lea rsp, [rsp-8*({m})]\n\t" // SVM 与x86栈的增长方向相反
| GOTO lab ->
$";GOTO {lab}\n\t\
jmp {lab}\n\t"
| IFZERO lab ->
$";IFZERO {lab}\n\t\
pop rax\n\t\
cmp rax,0\n\t\
je {lab}\n\t"
| IFNZRO lab ->
$";IFNZRO {lab}\n\t\
pop rax\n\t\
cmp rax,0\n\t\
jne {lab}\n\t"
| CALL (m, lab) ->
$";CALL {m},{lab}\n\t\
push rbp \n\t\
call near {lab}\n\t\
push rbx\n\t"
| TCALL (m, n, lab) -> "tcall\n\t"
| RET m ->
$";RET {m}\n\t\
pop rbx\n\t\
add rsp, 8*{m}\n\t\
pop rbp\n\t\
ret\n\t"
| PRINTI ->
$";PRINTI\n\t\
pop {arg_loc 0}\n\t\
push {arg_loc 0}\n\t\
sub rsp, 16\n\t\
call printi\n\t\
add rsp, 16\n\t\
"
| PRINTC ->
$";PRINTC\n\t
pop {arg_loc 0}\n\t\
push {arg_loc 0}\n\t\
sub rsp, 16\n\t\
call printc\n\t\
add rsp, 16\n\t\
"
| LDARGS m ->
$"\nldargs: ;set up command line arguments on stack:\n\t\
mov rcx, {arg_loc 0}\n\t\
mov rsi, {arg_loc 1}\n\
_args_next:\n\t\
cmp rcx, 0\n\t\
jz _args_end\n\t\
push qword [rsi]\n\t\
add rsi, 8\n\t\
sub rcx, 1\n\t\
jmp _args_next ;repeat until --ecx == 0\n\
_args_end:\n\t\
lea rbp, [rsp-{m - 1}*8] ; make rbp point to first arg\n\t"
| STOP ->
";STOP\n\t\
mov rsp, qword [glovars]\n\t\
add rsp, 8 ; restore rsp\n\t\
pop rbp\n\t\
ret\n\t"