1 files changed, 53 insertions, 0 deletions
diff --git a/compiler/rustc_ast/src/expand/allocator.rs b/compiler/rustc_ast/src/expand/allocator.rs
new file mode 100644
index 00000000000..cd27f958e46
--- /dev/null
+++ b/compiler/rustc_ast/src/expand/allocator.rs
@@ -0,0 +1,53 @@
+use rustc_span::symbol::{sym, Symbol};
+
+#[derive(Clone, Copy)]
+pub enum AllocatorKind {
+    Global,
+    Default,
+}
+
+impl AllocatorKind {
+    pub fn fn_name(&self, base: Symbol) -> String {
+        match *self {
+            AllocatorKind::Global => format!("__rg_{}", base),
+            AllocatorKind::Default => format!("__rdl_{}", base),
+        }
+    }
+}
+
+pub enum AllocatorTy {
+    Layout,
+    Ptr,
+    ResultPtr,
+    Unit,
+    Usize,
+}
+
+pub struct AllocatorMethod {
+    pub name: Symbol,
+    pub inputs: &'static [AllocatorTy],
+    pub output: AllocatorTy,
+}
+
+pub static ALLOCATOR_METHODS: &[AllocatorMethod] = &[
+    AllocatorMethod {
+        name: sym::alloc,
+        inputs: &[AllocatorTy::Layout],
+        output: AllocatorTy::ResultPtr,
+    },
+    AllocatorMethod {
+        name: sym::dealloc,
+        inputs: &[AllocatorTy::Ptr, AllocatorTy::Layout],
+        output: AllocatorTy::Unit,
+    },
+    AllocatorMethod {
+        name: sym::realloc,
+        inputs: &[AllocatorTy::Ptr, AllocatorTy::Layout, AllocatorTy::Usize],
+        output: AllocatorTy::ResultPtr,
+    },
+    AllocatorMethod {
+        name: sym::alloc_zeroed,
+        inputs: &[AllocatorTy::Layout],
+        output: AllocatorTy::ResultPtr,
+    },
+];