llvm/llvm/unittests/ExecutionEngine/MCJIT/MCJITTest.cpp

//===- MCJITTest.cpp - Unit tests for the MCJIT -----------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This test suite verifies basic MCJIT functionality such as making function
// calls, using global variables, and compiling multpile modules.
//
//===----------------------------------------------------------------------===//

#include "MCJITTestBase.h"
#include "llvm/Support/DynamicLibrary.h"
#include "gtest/gtest.h"

usingnamespacellvm;

namespace {

class MCJITTest : public testing::Test, public MCJITTestBase { … };

// FIXME: Ensure creating an execution engine does not crash when constructed
//        with a null module.
/*
TEST_F(MCJITTest, null_module) {
  createJIT(0);
}
*/

// FIXME: In order to JIT an empty module, there needs to be
// an interface to ExecutionEngine that forces compilation but
// does not require retrieval of a pointer to a function/global.
/*
TEST_F(MCJITTest, empty_module) {
  createJIT(M.take());
  //EXPECT_NE(0, TheJIT->getObjectImage())
  //  << "Unable to generate executable loaded object image";
}
*/

TEST_F(MCJITTest, global_variable) { … }

TEST_F(MCJITTest, add_function) { … }

TEST_F(MCJITTest, run_main) { … }

TEST_F(MCJITTest, return_global) { … }

// FIXME: This case fails due to a bug with getPointerToGlobal().
// The bug is due to MCJIT not having an implementation of getPointerToGlobal()
// which results in falling back on the ExecutionEngine implementation that
// allocates a new memory block for the global instead of using the same
// global variable that is emitted by MCJIT. Hence, the pointer (gvPtr below)
// has the correct initial value, but updates to the real global (accessed by
// JITted code) are not propagated. Instead, getPointerToGlobal() should return
// a pointer into the loaded ObjectImage to reference the emitted global.
/*
TEST_F(MCJITTest, increment_global) {
  SKIP_UNSUPPORTED_PLATFORM;

  int32_t initialNum = 5;
  Function *IncrementGlobal = startFunction(
      M.get(),
      FunctionType::get(Builder.getInt32Ty(), {}, false),
      "IncrementGlobal");
  GlobalVariable *GV = insertGlobalInt32(M.get(), "my_global", initialNum);
  Value *DerefGV = Builder.CreateLoad(GV);
  Value *AddResult = Builder.CreateAdd(DerefGV,
                                       ConstantInt::get(Context, APInt(32, 1)));
  Builder.CreateStore(AddResult, GV);
  endFunctionWithRet(IncrementGlobal, AddResult);

  createJIT(M.take());
  void *gvPtr = TheJIT->getPointerToGlobal(GV);
  EXPECT_EQ(initialNum, *(int32_t*)gvPtr);

  void *vPtr = TheJIT->getFunctionAddress(IncrementGlobal->getName().str());
  EXPECT_TRUE(0 != vPtr)
    << "Unable to get pointer to main() from JIT";

  int32_t(*FuncPtr)(void) = (int32_t(*)(void))(intptr_t)vPtr;

  for(int i = 1; i < 3; ++i) {
    int32_t result = FuncPtr();
    EXPECT_EQ(initialNum + i, result);            // OK
    EXPECT_EQ(initialNum + i, *(int32_t*)gvPtr);  // FAILS
  }
}
*/

// PR16013: XFAIL this test on ARM, which currently can't handle multiple relocations.
#if !defined(__arm__)

TEST_F(MCJITTest, multiple_functions) { … }

#endif /*!defined(__arm__)*/

TEST_F(MCJITTest, multiple_decl_lookups) { … }

FunctionHandlerPtr;

TEST_F(MCJITTest, lazy_function_creator_pointer) { … }

TEST_F(MCJITTest, lazy_function_creator_lambda) { … }

} // end anonymous namespace