/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_RENDERSCRIPT_EXECUTABLE_H
#define ANDROID_RENDERSCRIPT_EXECUTABLE_H


#include "rsCpuScript.h"

#include <stdlib.h>
#include <string>

namespace android {
namespace renderscript {

class Context;

class SharedLibraryUtils {
public:
#ifndef RS_COMPATIBILITY_LIB
    // Creates a shared library in cacheDir for the bitcode named resName.
    // If reuse is false and SOPath is not nullptr, saves the filename
    // used for the shared library in SOPath.
    static bool createSharedLibrary(const char* driverName,
                                    const char* cacheDir,
                                    const char* resName,
                                    const bool reuse = true,
                                    std::string *SOPath = nullptr);
#endif

    // Load the shared library referred to by cacheDir and resName. If we have
    // already loaded this library, we instead create a new copy (in the
    // cache dir) and then load that. We then immediately destroy the copy.
    // This is required behavior to implement script instancing for the support
    // library, since shared objects are loaded and de-duped by name only.

    // For 64bit RS Support Lib, the shared lib path cannot be constructed from
    // cacheDir, so nativeLibDir is needed to load shared libs.
    static void* loadSharedLibrary(const char *cacheDir, const char *resName,
                                   const char *nativeLibDir = nullptr,
                                   bool *alreadyLoaded = nullptr);

    // Load the shared library referred to by fullPath, and delete it right
    // after loading it. Files loaded by this function are only used once, e.g.,
    // shared libraries generated for scripts in a debug context. Deleting them
    // is OK in this case since the shared libraries have already been dlopened.
    // Deletion is also required because such files are not intended for reuse.
    static void* loadAndDeleteSharedLibrary(const char *fullPath);

    // Create a len length string containing random characters from [A-Za-z0-9].
    static std::string getRandomString(size_t len);

private:
    // Attempt to load the shared library from origName, but then fall back to
    // creating a copy of the shared library if necessary (to ensure instancing).
    // This function returns the dlopen()-ed handle if successful.
    static void *loadSOHelper(const char *origName, const char *cacheDir,
                              const char *resName, bool* alreadyLoaded = nullptr);

    static const char* LD_EXE_PATH;
    static const char* RS_CACHE_DIR;
};

class ScriptExecutable {
public:
    ScriptExecutable(void** fieldAddress, bool* fieldIsObject,
                     const char* const * fieldName, size_t varCount,
                     InvokeFunc_t* invokeFunctions, size_t funcCount,
                     ForEachFunc_t* forEachFunctions, uint32_t* forEachSignatures,
                     size_t forEachCount,
                     ReduceDescription *reduceDescriptions, size_t reduceCount,
                     const char** pragmaKeys, const char** pragmaValues,
                     size_t pragmaCount,
                     const char **globalNames, const void **globalAddresses,
                     const size_t *globalSizes,
                     const uint32_t *globalProperties, size_t globalEntries,
                     bool isThreadable, uint32_t buildChecksum) :
        mFieldAddress(fieldAddress), mFieldIsObject(fieldIsObject),
        mFieldName(fieldName), mExportedVarCount(varCount),
        mInvokeFunctions(invokeFunctions), mFuncCount(funcCount),
        mForEachFunctions(forEachFunctions), mForEachSignatures(forEachSignatures),
        mForEachCount(forEachCount),
        mReduceDescriptions(reduceDescriptions), mReduceCount(reduceCount),
        mPragmaKeys(pragmaKeys), mPragmaValues(pragmaValues),
        mPragmaCount(pragmaCount), mGlobalNames(globalNames),
        mGlobalAddresses(globalAddresses), mGlobalSizes(globalSizes),
        mGlobalProperties(globalProperties), mGlobalEntries(globalEntries),
        mIsThreadable(isThreadable), mBuildChecksum(buildChecksum) {
    }

    ~ScriptExecutable() {
        for (size_t i = 0; i < mExportedVarCount; ++i) {
            if (mFieldIsObject[i]) {
                if (mFieldAddress[i] != nullptr) {
                    rs_object_base *obj_addr =
                            reinterpret_cast<rs_object_base *>(mFieldAddress[i]);
                    rsrClearObject(obj_addr);
                }
            }
        }

        for (size_t i = 0; i < mPragmaCount; ++i) {
            delete [] mPragmaKeys[i];
            delete [] mPragmaValues[i];
        }
        delete[] mPragmaValues;
        delete[] mPragmaKeys;

        delete[] mReduceDescriptions;

        delete[] mForEachSignatures;
        delete[] mForEachFunctions;

        delete[] mInvokeFunctions;

        for (size_t i = 0; i < mExportedVarCount; i++) {
            delete[] mFieldName[i];
        }
        delete[] mFieldName;
        delete[] mFieldIsObject;
        delete[] mFieldAddress;
    }

    // Create an ScriptExecutable object from a shared object.
    // If expectedChecksum is not zero, it will be compared to the checksum
    // embedded in the shared object. A mismatch will cause a failure.
    // If succeeded, returns the new object. Otherwise, returns nullptr.
    static ScriptExecutable*
            createFromSharedObject(void* sharedObj,
                                   uint32_t expectedChecksum = 0);

    size_t getExportedVariableCount() const { return mExportedVarCount; }
    size_t getExportedFunctionCount() const { return mFuncCount; }
    size_t getExportedForEachCount() const { return mForEachCount; }
    size_t getExportedReduceCount() const { return mReduceCount; }
    size_t getPragmaCount() const { return mPragmaCount; }

    void* getFieldAddress(int slot) const { return mFieldAddress[slot]; }
    void* getFieldAddress(const char* name) const;
    bool getFieldIsObject(int slot) const { return mFieldIsObject[slot]; }
    const char* getFieldName(int slot) const { return mFieldName[slot]; }

    InvokeFunc_t getInvokeFunction(int slot) const { return mInvokeFunctions[slot]; }

    ForEachFunc_t getForEachFunction(int slot) const { return mForEachFunctions[slot]; }
    uint32_t getForEachSignature(int slot) const { return mForEachSignatures[slot]; }

    const ReduceDescription* getReduceDescription(int slot) const {
        return &mReduceDescriptions[slot];
    }

    const char ** getPragmaKeys() const { return mPragmaKeys; }
    const char ** getPragmaValues() const { return mPragmaValues; }

    const char* getGlobalName(int i) const {
        if (i < mGlobalEntries) {
            return mGlobalNames[i];
        } else {
            return nullptr;
        }
    }
    const void* getGlobalAddress(int i) const {
        if (i < mGlobalEntries) {
            return mGlobalAddresses[i];
        } else {
            return nullptr;
        }
    }
    size_t getGlobalSize(int i) const {
        if (i < mGlobalEntries) {
            return mGlobalSizes[i];
        } else {
            return 0;
        }
    }
    uint32_t getGlobalProperties(int i) const {
        if (i < mGlobalEntries) {
            return mGlobalProperties[i];
        } else {
            return 0;
        }
    }
    int getGlobalEntries() const { return mGlobalEntries; }

    bool getThreadable() const { return mIsThreadable; }

    uint32_t getBuildChecksum() const { return mBuildChecksum; }

    bool dumpGlobalInfo() const;

private:
    void** mFieldAddress;
    bool* mFieldIsObject;
    const char* const * mFieldName;
    size_t mExportedVarCount;

    InvokeFunc_t* mInvokeFunctions;
    size_t mFuncCount;

    ForEachFunc_t* mForEachFunctions;
    uint32_t* mForEachSignatures;
    size_t mForEachCount;

    ReduceDescription* mReduceDescriptions;
    size_t mReduceCount;

    const char ** mPragmaKeys;
    const char ** mPragmaValues;
    size_t mPragmaCount;

    const char ** mGlobalNames;
    const void ** mGlobalAddresses;
    const size_t * mGlobalSizes;
    const uint32_t * mGlobalProperties;
    int mGlobalEntries;

    bool mIsThreadable;
    uint32_t mBuildChecksum;
};

}  // namespace renderscript
}  // namespace android

#endif  // ANDROID_RENDERSCRIPT_EXECUTABLE_H