hotfix(lab1): rm alloc from panic (#58)

* hotfix(lab1): rm std crate alloc

* fix: make panic no alloc

Author: fuuzen

src/0x01/crates/kernel/src/lib.rs

@@ -2,7 +2,6 @@
 #![feature(abi_x86_interrupt)]
 #![feature(type_alias_impl_trait)]
 
-extern crate alloc;
 #[macro_use]
 extern crate log;
 extern crate libm;
@@ -13,8 +12,6 @@ pub use utils::*;
 
 mod drivers;
 
-pub use alloc::format;
-
 use boot::BootInfo;
 use uefi::{Status, runtime::ResetType};
 

src/0x01/crates/kernel/src/utils/macros.rs

@@ -1,5 +1,4 @@
-use alloc::string::ToString;
-use core::{arch::asm, fmt::*};
+use core::{arch::asm, fmt::*, panic::Location};
 
 use x86_64::instructions::interrupts;
 
@@ -74,20 +73,20 @@ fn panic(info: &core::panic::PanicInfo) -> ! {
     // force unlock serial for panic output
     unsafe { SERIAL.get().unwrap().force_unlock() };
 
-    let location = if let Some(location) = info.location() {
-        alloc::format!(
-            "{}:{}:{}",
-            location.file(),
-            location.line(),
-            location.column()
-        )
-    } else {
-        "Unknown location".to_string()
-    };
+    struct PanicLocation<'a>(Option<&'a Location<'a>>);
+
+    impl Display for PanicLocation<'_> {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            match self.0 {
+                Some(loc) => Display::fmt(loc, f),
+                None => f.write_str("unknown location"),
+            }
+        }
+    }
 
     error!(
         "\n\n\rERROR: panicked at {}\n\n\r{}\n",
-        location,
+        PanicLocation(info.location()),
         info.message()
     );
 

src/0x04/crates/lib/src/lib.rs

@@ -1,6 +1,6 @@
 #![cfg_attr(not(test), no_std)]
 #![allow(dead_code, unused_imports)]
-#![feature(alloc_error_handler)]
+#![cfg_attr(not(test), feature(alloc_error_handler))]
 
 #[macro_use]
 pub mod macros;

src/0x07/crates/lib/src/lib.rs

@@ -1,5 +1,5 @@
 #![allow(dead_code, unused_imports)]
-#![feature(alloc_error_handler)]
+#![cfg_attr(not(test), feature(alloc_error_handler))]
 #![cfg_attr(not(test), no_std)]
 
 #[macro_use]