brainfuck interpreter

examples/arrays.zr

@@ -1,5 +0,0 @@
-func main[] : I64
-    let xs: Array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
-    for x in 0..3
-        for y in 0..3
-            print_i64(xs[y][x])

examples/brainfuck.zr

@@ -0,0 +1,45 @@
+func main[] : I64
+    let src: String = "++++++++[>+>++++<<-]>++>>+<[-[>>+<<-]+>>]>+[-<<<[->[+[-]+>++>>>-<<]<[<]>>++++++[<<+++++>>-]+<<++.[-]<<]>.>+[>>]>+]"
+    let src_len: I64 = strlen(src)
+    let i: I64 = 0
+
+    let memory: Ptr = calloc(1, 30000)
+    let p: I64 = 0
+
+    while i < src_len
+        let op: U8 = String.nth(src, i)
+
+        if op == '>'
+            p = p + 1
+        else if op == '<'
+            p = p - 1
+        else if op == '+'
+            String.set(memory, p, String.nth(memory, p)+1)
+        else if op == '-'
+            String.set(memory, p, String.nth(memory, p)-1)
+        else if op == '.'
+            printf("%c", String.nth(memory, p))
+        else if op == ','
+            String.set(memory, p, getchar())
+        else if op == '['
+            if !String.nth(memory, p)
+                i = i + 1
+                let opened: I64 = 0
+                while i < src_len && !(String.nth(src, i) == ']' && !opened)
+                    if String.nth(src, i) == '['
+                        opened = opened + 1
+                    else if String.nth(src, i) == ']'
+                        opened = opened - 1
+                    i = i + 1
+        else if op == ']'
+            if String.nth(memory, p)
+                i = i - 1
+                let closed: I64 = 0
+                while i >= 0 && !(String.nth(src, i) == '[' && !closed)
+                    if String.nth(src, i) == ']'
+                        closed = closed + 1
+                    else if String.nth(src, i) == '['
+                        closed = closed - 1
+                    i = i - 1
+
+        i = i + 1

examples/tcp_client.zr

@@ -4,7 +4,7 @@ func main[] : I64
         panic("socket() failed")
 
     let port: I64 = 80
-    let sa: Ptr = calloc(16)
+    let sa: Ptr = calloc(1, 16)
     String.set(sa, 0, 2)
     String.set(sa, 1, 0)
     String.set(sa, 2, Bit.rshift(port, 8) && 255)

examples/tcp_server.zr

@@ -4,7 +4,7 @@ func main[] : I64
         panic("socket() failed")
 
     let port: I64 = 8080
-    let sa: Ptr = calloc(16)
+    let sa: Ptr = calloc(1, 16)
     String.set(sa, 0, 2)
     String.set(sa, 1, 0)
     String.set(sa, 2, Bit.rshift(port, 8) && 255)

src/codegen_x86_64.rs

@@ -133,9 +133,16 @@ extern close
 extern bind
 extern listen
 extern accept
+extern getchar
 
-section .text._builtin_deref
+section .text._builtin_deref8
-_builtin_deref:
+_builtin_deref8:
+    xor rax, rax 
+    mov al, byte [rdi]
+    ret
+
+section .text._builtin_deref64
+_builtin_deref64:
     mov rax, qword [rdi]
     ret
 

src/std.zr

@@ -9,7 +9,7 @@ func print_i64[x: I64] : I64
     printf("%ld\n", x)
 
 func String.nth[s: String, n: I64] : U8
-    return _builtin_deref(s + n)
+    return _builtin_deref8(s + n)
 
 func String.set[s: String, n: I64, c: U8] : I64
     _builtin_string_set(s, n, c)
@@ -169,7 +169,7 @@ func Math.urandom[]: I64
     let file: Ptr = fopen("/dev/urandom", "rb")
     fread(buffer, 8, 1, file)
     fclose(file)
-    let n: I64 = _builtin_deref(buffer)
+    let n: I64 = _builtin_deref64(buffer)
     free(buffer)
     return n
 
@@ -188,8 +188,8 @@ func Array.size[xs: Array] : I64
 func OS.time[] : I64
     let tv: Ptr = malloc(16)
     gettimeofday(tv, 0)
-    let seconds: I64 = _builtin_deref(tv)
+    let seconds: I64 = _builtin_deref64(tv)
-    let microseconds: I64 = _builtin_deref(tv+8)
+    let microseconds: I64 = _builtin_deref64(tv+8)
     free(tv)
     return seconds * 1000 + microseconds / 1000
 

test.zr

@@ -1,8 +1,4 @@
 func run_test[x: String] : I64
-    // requires stdin
-    if strcmp(x, "guess_number.zr") == 0
-        return 0
-
     printf("\033[93mBuilding %s...\033[0m", x)
     let cmd: String = String.concat("./target/release/zern examples/", x)
 
@@ -14,12 +10,15 @@ func run_test[x: String] : I64
     free(cmd)
     printf(" %ldms\n", build_end_time - build_start_time)
 
-    let run_start_time: I64 = OS.time()
+    if strcmp(x, "guess_number.zr") == 0 || strcmp(x, "tcp_server.zr") == 0
-    if system("./out") != 0
+        printf("\033[93mSkipping %s...\033[0m\n")
-        exit(1)
+    else
-    let run_end_time: I64 = OS.time()
+        let run_start_time: I64 = OS.time()
+        if system("./out") != 0
+            exit(1)
+        let run_end_time: I64 = OS.time()
 
-    printf("\033[93mRunning %s...\033[0m %ldms\n", x, run_end_time - run_start_time)
+        printf("\033[93mRunning %s...\033[0m %ldms\n", x, run_end_time - run_start_time)
 
 func main[] : I64
     system("cargo build --release")