1 files changed, 81 insertions, 0 deletions
diff --git a/llvm/unittests/tools/llvm-exegesis/Common/AssemblerUtils.h b/llvm/unittests/tools/llvm-exegesis/Common/AssemblerUtils.h
new file mode 100644
index 00000000000..78b0c2506fa
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+++ b/llvm/unittests/tools/llvm-exegesis/Common/AssemblerUtils.h
@@ -0,0 +1,81 @@
+//===-- AssemblerUtils.h ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Assembler.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/TargetInstrInfo.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/MC/MCInstBuilder.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace exegesis {
+
+class MachineFunctionGeneratorBaseTest : public ::testing::Test {
+protected:
+  MachineFunctionGeneratorBaseTest(const std::string &TT,
+                                   const std::string &CpuName)
+      : TT(TT), CpuName(CpuName),
+        CanExecute(llvm::Triple(TT).getArch() ==
+                   llvm::Triple(llvm::sys::getProcessTriple()).getArch()) {
+    if (!CanExecute) {
+      llvm::outs() << "Skipping execution, host:"
+                   << llvm::sys::getProcessTriple() << ", target:" << TT
+                   << "\n";
+    }
+  }
+
+  void RunIfSupported(const ExecutableFunction &Function) const {
+    if (CanExecute)
+      Function();
+  }
+
+  template <class... Bs> inline void Check(llvm::MCInst MCInst, Bs... Bytes) {
+    ExecutableFunction Function = (MCInst.getOpcode() == 0)
+                                      ? assembleToFunction({})
+                                      : assembleToFunction({MCInst});
+    ASSERT_THAT(Function.getFunctionBytes().str(),
+                testing::ElementsAre(Bytes...));
+    if (CanExecute)
+      Function();
+  }
+
+private:
+  std::unique_ptr<llvm::LLVMTargetMachine> createTargetMachine() {
+    std::string Error;
+    const llvm::Target *TheTarget =
+        llvm::TargetRegistry::lookupTarget(TT, Error);
+    EXPECT_TRUE(TheTarget) << Error << " " << TT;
+    const llvm::TargetOptions Options;
+    llvm::TargetMachine *TM = TheTarget->createTargetMachine(
+        TT, CpuName, "", Options, llvm::Reloc::Model::Static);
+    EXPECT_TRUE(TM) << TT << " " << CpuName;
+    return std::unique_ptr<llvm::LLVMTargetMachine>(
+        static_cast<llvm::LLVMTargetMachine *>(TM));
+  }
+
+  ExecutableFunction
+  assembleToFunction(llvm::ArrayRef<llvm::MCInst> Instructions) {
+    llvm::SmallString<256> Buffer;
+    llvm::raw_svector_ostream AsmStream(Buffer);
+    assembleToStream(createTargetMachine(), Instructions, AsmStream);
+    return ExecutableFunction(createTargetMachine(),
+                              getObjectFromBuffer(AsmStream.str()));
+  }
+
+  const std::string TT;
+  const std::string CpuName;
+  const bool CanExecute;
+};
+
+} // namespace exegesis