rustc_codegen_ssa: remove define_fn and define_internal_fn.

Author: eddyb

src/librustc_codegen_llvm/declare.rs

@@ -130,28 +130,6 @@ impl DeclareMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         }
     }
 
-    fn define_fn(
-        &self,
-        name: &str,
-        fn_sig: PolyFnSig<'tcx>,
-    ) -> &'ll Value {
-        if self.get_defined_value(name).is_some() {
-            self.sess().fatal(&format!("symbol `{}` already defined", name))
-        } else {
-            self.declare_fn(name, fn_sig)
-        }
-    }
-
-    fn define_internal_fn(
-        &self,
-        name: &str,
-        fn_sig: PolyFnSig<'tcx>,
-    ) -> &'ll Value {
-        let llfn = self.define_fn(name, fn_sig);
-        unsafe { llvm::LLVMRustSetLinkage(llfn, llvm::Linkage::InternalLinkage) };
-        llfn
-    }
-
     fn get_declared_value(&self, name: &str) -> Option<&'ll Value> {
         debug!("get_declared_value(name={:?})", name);
         let namebuf = SmallCStr::new(name);

src/librustc_codegen_llvm/intrinsic.rs

@@ -1009,7 +1009,9 @@ fn gen_fn<'ll, 'tcx>(
         hir::Unsafety::Unsafe,
         Abi::Rust
     ));
-    let llfn = cx.define_internal_fn(name, rust_fn_sig);
+    let llfn = cx.declare_fn(name, rust_fn_sig);
+    // FIXME(eddyb) find a nicer way to do this.
+    unsafe { llvm::LLVMRustSetLinkage(llfn, llvm::Linkage::InternalLinkage) };
     attributes::from_fn_attrs(cx, llfn, None, rust_fn_sig);
     let bx = Builder::new_block(cx, llfn, "entry-block");
     codegen(bx);

src/librustc_codegen_ssa/traits/declare.rs

@@ -38,20 +38,6 @@ pub trait DeclareMethods<'tcx>: BackendTypes {
     /// Use this function when you intend to define a global without a name.
     fn define_private_global(&self, ty: Self::Type) -> Self::Value;
 
-    /// Declare a Rust function with an intention to define it.
-    ///
-    /// Use this function when you intend to define a function. This function will
-    /// return panic if the name already has a definition associated with it. This
-    /// can happen with #[no_mangle] or #[export_name], for example.
-    fn define_fn(&self, name: &str, fn_sig: ty::PolyFnSig<'tcx>) -> Self::Value;
-
-    /// Declare a Rust function with an intention to define it.
-    ///
-    /// Use this function when you intend to define a function. This function will
-    /// return panic if the name already has a definition associated with it. This
-    /// can happen with #[no_mangle] or #[export_name], for example.
-    fn define_internal_fn(&self, name: &str, fn_sig: ty::PolyFnSig<'tcx>) -> Self::Value;
-
     /// Gets declared value by name.
     fn get_declared_value(&self, name: &str) -> Option<Self::Value>;