Start work on a procedural macro

Turns out the system still needs some work.

Cargo.toml

@@ -12,4 +12,6 @@ repository = "https://github.com/bspeice/qadapt.git"
 backtrace = "0.3"
 libc = "0.2"
 log = "0.4"
-spin = "0.4"
+spin = "0.4"
+
+qadapt-macro = { path = "./qadapt-macro" }

qadapt-macro/.gitignore

@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock

qadapt-macro/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "qadapt-macro"
+version = "0.1.0"
+authors = ["Bradlee Speice <bradlee@speice.io>"]
+
+[lib]
+proc-macro = true
+
+[dependencies]

qadapt-macro/src/lib.rs

@@ -0,0 +1,31 @@
+//! Helper macros to use with the QADAPT allocator system
+//! 
+//! This crate is unusable on its own, but because `proc_macro` crates
+//! can't export non-proc-macro symbols, we have to go through an extra step
+//! to move these up.
+//! 
+//! Ultimately, this does actually work because we don't need to actually use
+//! references to the underlying functionality here, we just need to know
+//! where they will ultimately end up at.
+// TODO: This causes issues, but I can't track down why
+// #![deny(missing_docs)]
+extern crate proc_macro;
+
+use proc_macro::TokenTree;
+use proc_macro::TokenStream;
+
+/// Set up the QADAPT allocator to trigger a panic if any allocations happen during
+/// this function. Race conditions between threads are not checked, this macro will
+/// only work as intended in a single-threaded or otherwise synchronized environment.
+#[proc_macro_attribute]
+pub fn allocate_panic(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    let ret = item.clone();
+
+    let mut token_iter = item.into_iter();
+    match token_iter.next() {
+        Some(TokenTree::Ident(ref i)) if i.to_string() == "fn" => (),
+        _ => panic!("#[allocate_panic] macro can only be applied to functions")
+    }
+
+    ret
+}

src/lib.rs

@@ -1,9 +1,13 @@
 extern crate backtrace;
 extern crate libc;
+extern crate qadapt_macro;
 #[macro_use]
 extern crate log;
 extern crate spin;
 
+// Re-export the proc macros to use by other code
+pub use qadapt_macro::*;
+
 use backtrace::Backtrace;
 use libc::c_void;
 use libc::free;

tests/allocations.rs

@@ -1,5 +1,4 @@
 #![feature(asm)]
-
 extern crate qadapt;
 
 use qadapt::QADAPT;