Add callbr support to LLVM wrapper

Author: nbdd0121

compiler/rustc_codegen_llvm/src/builder.rs

@@ -1514,6 +1514,58 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
         }
     }
 
+    pub(crate) fn callbr(
+        &mut self,
+        llty: &'ll Type,
+        fn_attrs: Option<&CodegenFnAttrs>,
+        fn_abi: Option<&FnAbi<'tcx, Ty<'tcx>>>,
+        llfn: &'ll Value,
+        args: &[&'ll Value],
+        default_dest: &'ll BasicBlock,
+        indirect_dest: &[&'ll BasicBlock],
+        funclet: Option<&Funclet<'ll>>,
+    ) -> &'ll Value {
+        debug!("invoke {:?} with args ({:?})", llfn, args);
+
+        let args = self.check_call("callbr", llty, llfn, args);
+        let funclet_bundle = funclet.map(|funclet| funclet.bundle());
+        let funclet_bundle = funclet_bundle.as_ref().map(|b| &*b.raw);
+        let mut bundles: SmallVec<[_; 2]> = SmallVec::new();
+        if let Some(funclet_bundle) = funclet_bundle {
+            bundles.push(funclet_bundle);
+        }
+
+        // Emit CFI pointer type membership test
+        self.cfi_type_test(fn_attrs, fn_abi, llfn);
+
+        // Emit KCFI operand bundle
+        let kcfi_bundle = self.kcfi_operand_bundle(fn_attrs, fn_abi, llfn);
+        let kcfi_bundle = kcfi_bundle.as_ref().map(|b| &*b.raw);
+        if let Some(kcfi_bundle) = kcfi_bundle {
+            bundles.push(kcfi_bundle);
+        }
+
+        let callbr = unsafe {
+            llvm::LLVMRustBuildCallBr(
+                self.llbuilder,
+                llty,
+                llfn,
+                default_dest,
+                indirect_dest.as_ptr(),
+                indirect_dest.len() as c_uint,
+                args.as_ptr(),
+                args.len() as c_uint,
+                bundles.as_ptr(),
+                bundles.len() as c_uint,
+                UNNAMED,
+            )
+        };
+        if let Some(fn_abi) = fn_abi {
+            fn_abi.apply_attrs_callsite(self, callbr);
+        }
+        callbr
+    }
+
     // Emits CFI pointer type membership tests.
     fn cfi_type_test(
         &mut self,

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -1619,6 +1619,20 @@ extern "C" {
         Name: *const c_char,
     ) -> &'a Value;
 
+    pub fn LLVMRustBuildCallBr<'a>(
+        B: &Builder<'a>,
+        Ty: &'a Type,
+        Fn: &'a Value,
+        DefaultDest: &'a BasicBlock,
+        IndirectDests: *const &'a BasicBlock,
+        NumIndirectDests: c_uint,
+        Args: *const &'a Value,
+        NumArgs: c_uint,
+        OpBundles: *const &OperandBundleDef<'a>,
+        NumOpBundles: c_uint,
+        Name: *const c_char,
+    ) -> &'a Value;
+
     pub fn LLVMRustSetFastMath(Instr: &Value);
 
     // Miscellaneous instructions

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1504,6 +1504,31 @@ LLVMRustBuildInvoke(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
                                       Name));
 }
 
+extern "C" LLVMValueRef
+LLVMRustBuildCallBr(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
+                    LLVMBasicBlockRef DefaultDest,
+                    LLVMBasicBlockRef *IndirectDests, unsigned NumIndirectDests,
+                    LLVMValueRef *Args, unsigned NumArgs,
+                    OperandBundleDef **OpBundles, unsigned NumOpBundles,
+                    const char *Name) {
+  Value *Callee = unwrap(Fn);
+  FunctionType *FTy = unwrap<FunctionType>(Ty);
+
+  // FIXME: Is there a way around this?
+  std::vector<BasicBlock*> IndirectDestsUnwrapped;
+  IndirectDestsUnwrapped.reserve(NumIndirectDests);
+  for (unsigned i = 0; i < NumIndirectDests; ++i) {
+    IndirectDestsUnwrapped.push_back(unwrap(IndirectDests[i]));
+  }
+
+  return wrap(unwrap(B)->CreateCallBr(
+      FTy, Callee, unwrap(DefaultDest),
+      ArrayRef<BasicBlock*>(IndirectDestsUnwrapped),
+      ArrayRef<Value*>(unwrap(Args), NumArgs),
+      ArrayRef<OperandBundleDef>(*OpBundles, NumOpBundles),
+      Name));
+}
+
 extern "C" void LLVMRustPositionBuilderAtStart(LLVMBuilderRef B,
                                                LLVMBasicBlockRef BB) {
   auto Point = unwrap(BB)->getFirstInsertionPt();