mcdc-coverage: Add utils for instrprof.mcdc.parameters intrinsic

Author: RenjiSann

compiler/rustc_codegen_llvm/src/builder.rs

@@ -1238,6 +1238,38 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
         }
     }
 
+    fn instrprof_mcdc_parameters(
+        &mut self,
+        fn_name: Self::Value,
+        hash: Self::Value,
+        num_bitmap_bytes: Self::Value,
+    ) {
+        debug!(
+            "instrprof_mcdc_parameters() with args ({:?}, {:?}, {:?})",
+            fn_name, hash, num_bitmap_bytes
+        );
+
+        let llfn = unsafe { llvm::LLVMRustGetInstrProfMCDCParametersIntrinsic(self.cx().llmod) };
+        let llty = self.cx.type_func(
+            &[self.cx.type_ptr(), self.cx.type_i64(), self.cx.type_i32()],
+            self.cx.type_void(),
+        );
+        let args = &[fn_name, hash, num_bitmap_bytes];
+        let args = self.check_call("call", llty, llfn, args);
+
+        unsafe {
+            let _ = llvm::LLVMRustBuildCall(
+                self.llbuilder,
+                llty,
+                llfn,
+                args.as_ptr() as *const &llvm::Value,
+                args.len() as c_uint,
+                [].as_ptr(),
+                0 as c_uint,
+            );
+        }
+    }
+
     fn call(
         &mut self,
         llty: &'ll Type,

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -1631,6 +1631,7 @@ extern "C" {
 
     // Miscellaneous instructions
     pub fn LLVMRustGetInstrProfIncrementIntrinsic(M: &Module) -> &Value;
+    pub fn LLVMRustGetInstrProfMCDCParametersIntrinsic(M: &Module) -> &Value;
     pub fn LLVMRustBuildCall<'a>(
         B: &Builder<'a>,
         Ty: &'a Type,

compiler/rustc_codegen_ssa/src/traits/builder.rs

@@ -382,6 +382,13 @@ pub trait BuilderMethods<'a, 'tcx>:
         index: Self::Value,
     );
 
+    fn instrprof_mcdc_parameters(
+        &mut self,
+        fn_name: Self::Value,
+        hash: Self::Value,
+        num_bitmap_bytes: Self::Value
+    );
+
     fn call(
         &mut self,
         llty: Self::Type,

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1528,6 +1528,11 @@ extern "C" LLVMValueRef LLVMRustGetInstrProfIncrementIntrinsic(LLVMModuleRef M)
               (llvm::Intrinsic::ID)llvm::Intrinsic::instrprof_increment));
 }
 
+extern "C" LLVMValueRef LLVMRustGetInstrProfMCDCParametersIntrinsic(LLVMModuleRef M) {
+  return wrap(llvm::Intrinsic::getDeclaration(unwrap(M),
+              (llvm::Intrinsic::ID)llvm::Intrinsic::instrprof_mcdc_parameters));
+}
+
 extern "C" LLVMValueRef LLVMRustBuildMemCpy(LLVMBuilderRef B,
                                             LLVMValueRef Dst, unsigned DstAlign,
                                             LLVMValueRef Src, unsigned SrcAlign,