Use LLVM-C APIs for getting/setting visibility

Author: Zalathar

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -161,9 +161,9 @@ pub enum Linkage {
     LinkerPrivateWeakLinkage = 16,
 }
 
-// LLVMRustVisibility
+/// Must match the layout of `LLVMVisibility`.
 #[repr(C)]
-#[derive(Copy, Clone, PartialEq)]
+#[derive(Copy, Clone, PartialEq, TryFromU32)]
 pub enum Visibility {
     Default = 0,
     Hidden = 1,
@@ -984,6 +984,8 @@ unsafe extern "C" {
     pub fn LLVMGetLinkage(Global: &Value) -> RawEnum<Linkage>;
     pub fn LLVMSetLinkage(Global: &Value, RustLinkage: Linkage);
     pub fn LLVMSetSection(Global: &Value, Section: *const c_char);
+    pub fn LLVMGetVisibility(Global: &Value) -> RawEnum<Visibility>;
+    pub fn LLVMSetVisibility(Global: &Value, Viz: Visibility);
     pub fn LLVMGetAlignment(Global: &Value) -> c_uint;
     pub fn LLVMSetAlignment(Global: &Value, Bytes: c_uint);
     pub fn LLVMSetDLLStorageClass(V: &Value, C: DLLStorageClass);
@@ -1559,8 +1561,6 @@ unsafe extern "C" {
     ) -> bool;
 
     // Operations on global variables, functions, and aliases (globals)
-    pub fn LLVMRustGetVisibility(Global: &Value) -> Visibility;
-    pub fn LLVMRustSetVisibility(Global: &Value, Viz: Visibility);
     pub fn LLVMRustSetDSOLocal(Global: &Value, is_dso_local: bool);
 
     // Operations on global variables

compiler/rustc_codegen_llvm/src/llvm/mod.rs

@@ -243,12 +243,12 @@ pub fn set_linkage(llglobal: &Value, linkage: Linkage) {
 }
 
 pub fn get_visibility(llglobal: &Value) -> Visibility {
-    unsafe { LLVMRustGetVisibility(llglobal) }
+    unsafe { LLVMGetVisibility(llglobal) }.to_rust()
 }
 
 pub fn set_visibility(llglobal: &Value, visibility: Visibility) {
     unsafe {
-        LLVMRustSetVisibility(llglobal, visibility);
+        LLVMSetVisibility(llglobal, visibility);
     }
 }
 

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1646,45 +1646,6 @@ extern "C" bool LLVMRustConstInt128Get(LLVMValueRef CV, bool sext,
   return true;
 }
 
-enum class LLVMRustVisibility {
-  Default = 0,
-  Hidden = 1,
-  Protected = 2,
-};
-
-static LLVMRustVisibility toRust(LLVMVisibility Vis) {
-  switch (Vis) {
-  case LLVMDefaultVisibility:
-    return LLVMRustVisibility::Default;
-  case LLVMHiddenVisibility:
-    return LLVMRustVisibility::Hidden;
-  case LLVMProtectedVisibility:
-    return LLVMRustVisibility::Protected;
-  }
-  report_fatal_error("Invalid LLVMRustVisibility value!");
-}
-
-static LLVMVisibility fromRust(LLVMRustVisibility Vis) {
-  switch (Vis) {
-  case LLVMRustVisibility::Default:
-    return LLVMDefaultVisibility;
-  case LLVMRustVisibility::Hidden:
-    return LLVMHiddenVisibility;
-  case LLVMRustVisibility::Protected:
-    return LLVMProtectedVisibility;
-  }
-  report_fatal_error("Invalid LLVMRustVisibility value!");
-}
-
-extern "C" LLVMRustVisibility LLVMRustGetVisibility(LLVMValueRef V) {
-  return toRust(LLVMGetVisibility(V));
-}
-
-extern "C" void LLVMRustSetVisibility(LLVMValueRef V,
-                                      LLVMRustVisibility RustVisibility) {
-  LLVMSetVisibility(V, fromRust(RustVisibility));
-}
-
 extern "C" void LLVMRustSetDSOLocal(LLVMValueRef Global, bool is_dso_local) {
   unwrap<GlobalValue>(Global)->setDSOLocal(is_dso_local);
 }