// SPDX-License-Identifier: Apache-2.0

// SPDX-FileCopyrightText: Copyright The WasmEdge Authors

#include "executor/executor.h"

#include <cstdint>

namespace WasmEdge {

namespace Executor {

// Instantiate memory instance. See "include/executor/executor.h".

Expect<void> Executor::instantiate(Runtime::Instance::ModuleInstance &ModInst,

                                   const AST::MemorySection &MemSec) {

  // Prepare pointers vector for compiled functions.

  ModInst.MemoryPtrs.resize(ModInst.getMemoryNum() +

                            MemSec.getContent().size());

  ModInst.MemorySizePtrs.resize(ModInst.getMemoryNum() +

                                MemSec.getContent().size());

  // Set the memory pointers of imported memories.

  for (uint32_t I = 0; I < ModInst.getMemoryNum(); ++I) {

#if WASMEDGE_ALLOCATOR_IS_STABLE

    ModInst.MemoryPtrs[I] = (*ModInst.getMemory(I))->getDataPtr();

#else

    ModInst.MemoryPtrs[I] = &(*ModInst.getMemory(I))->getDataPtr();

#endif

    ModInst.MemorySizePtrs[I] = (*ModInst.getMemory(I))->getPageSizePtr();

  }

  // Iterate through the memory types to instantiate memory instances.

  for (const auto &MemType : MemSec.getContent()) {

    // Create and add the memory instance to the module instance.

    ModInst.addMemory(MemType, Conf.getRuntimeConfigure().getMaxMemoryPage());

    const auto Index = ModInst.getMemoryNum() - 1;

    Runtime::Instance::MemoryInstance *MemInst = *ModInst.getMemory(Index);

    // Set the memory pointers of instantiated memories.

#if WASMEDGE_ALLOCATOR_IS_STABLE

    ModInst.MemoryPtrs[Index] = MemInst->getDataPtr();

#else

    ModInst.MemoryPtrs[Index] = &MemInst->getDataPtr();

#endif

    ModInst.MemorySizePtrs[Index] = MemInst->getPageSizePtr();

  }

  return {};

}

} // namespace Executor

} // namespace WasmEdge