fix various bugs related to guess number example

example/guess_number/main.zig

@@ -10,7 +10,9 @@ pub fn main(argc: isize, argv: &&u8, env: &&u8) -> i32 {
     print_str("Welcome to the Guess Number Game in Zig.\n");
 
     var seed : u32;
-    if (os_get_random_bytes(&seed as &u8, 4) != 0) {
+    var err : isize;
+    // TODO #sizeof(u32) instead of 4
+    if ({err = os_get_random_bytes(&seed as &u8, 4); err != 4}) {
         // TODO full error message
         fprint_str(stderr_fileno, "unable to get random bytes");
         return 1;

src/analyze.cpp

@@ -196,6 +196,7 @@ static TypeTableEntry *get_array_type(CodeGen *g, TypeTableEntry *child_type, ui
 
         entry->size_in_bits = child_type->size_in_bits * array_size;
         entry->align_in_bits = child_type->align_in_bits;
+
         entry->di_type = LLVMZigCreateDebugArrayType(g->dbuilder, entry->size_in_bits,
                 entry->align_in_bits, child_type->di_type, array_size);
         entry->data.array.child_type = child_type;

src/codegen.cpp

@@ -1570,6 +1570,7 @@ static void do_code_gen(CodeGen *g) {
 
                     add_debug_source_node(g, var->decl_node);
                     var->value_ref = LLVMBuildAlloca(g->builder, var->type->type_ref, buf_ptr(&var->name));
+                    LLVMSetAlignment(var->value_ref, var->type->align_in_bits / 8);
                 }
 
                 var->di_loc_var = LLVMZigCreateLocalVariable(g->dbuilder, tag,

src/parser.cpp

@@ -628,7 +628,7 @@ static uint8_t parse_char_literal(ParseContext *pc, Token *token) {
     } else if (return_count > 1) {
         ast_error(pc, token, "character literal too long");
     }
-    return return_count;
+    return return_value;
 }
 
 static void parse_string_literal(ParseContext *pc, Token *token, Buf *buf, bool *out_c_str,

std/std.zig

@@ -1,9 +1,6 @@
 const SYS_write : usize = 1;
 const SYS_exit : usize = 60;
-const SYS_getrandom : usize = 278;
-
-const stdout_fileno : isize = 1;
-const stderr_fileno : isize = 2;
+const SYS_getrandom : usize = 318;
 
 fn syscall1(number: usize, arg1: usize) -> usize {
     asm volatile ("syscall"
@@ -19,32 +16,37 @@ fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
         : "rcx", "r11")
 }
 
-pub fn getrandom(buf: &u8, count: usize, flags: u32) -> i32 {
-    return syscall3(SYS_getrandom, buf as usize, count, flags as usize) as i32;
-}
-
 pub fn write(fd: isize, buf: &const u8, count: usize) -> isize {
-    return syscall3(SYS_write, fd as usize, buf as usize, count) as isize;
+    syscall3(SYS_write, fd as usize, buf as usize, count) as isize
 }
 
 pub fn exit(status: i32) -> unreachable {
     syscall1(SYS_exit, status as usize);
-    unreachable;
+    unreachable
 }
 
+pub fn getrandom(buf: &u8, count: usize, flags: u32) -> isize {
+    syscall3(SYS_getrandom, buf as usize, count, flags as usize) as isize
+}
+
+const stdout_fileno : isize = 1;
+const stderr_fileno : isize = 2;
+
 // TODO error handling
-pub fn os_get_random_bytes(buf: &u8, count: usize) -> i32 {
-    return getrandom(buf, count, 0);
+pub fn os_get_random_bytes(buf: &u8, count: usize) -> isize {
+    getrandom(buf, count, 0)
 }
 
 // TODO error handling
 // TODO handle buffering and flushing (mutex protected)
-pub fn print_str(str: string) -> isize { fprint_str(stdout_fileno, str) }
+pub fn print_str(str: string) -> isize {
+    fprint_str(stdout_fileno, str)
+}
 
 // TODO error handling
 // TODO handle buffering and flushing (mutex protected)
 pub fn fprint_str(fd: isize, str: string) -> isize {
-    return write(fd, str.ptr, str.len);
+    write(fd, str.ptr, str.len)
 }
 
 // TODO handle buffering and flushing (mutex protected)
@@ -56,7 +58,9 @@ pub fn print_u64(x: u64) -> isize {
     return write(stdout_fileno, buf.ptr, len);
 }
 
-fn digit_to_char(digit: u64) -> u8 { '0' + (digit as u8) }
+fn digit_to_char(digit: u64) -> u8 {
+    '0' + (digit as u8)
+}
 
 const max_u64_base10_digits: usize = 20;