/*

 * Copyright 2014 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#include "include/core/SkTypes.h"

#include "tools/ProcStats.h"

#if defined(__Fuchsia__)

    #include <zircon/process.h>

    #include <zircon/syscalls.h>

    #include <zircon/syscalls/object.h>

    #include <zircon/types.h>

    int64_t sk_tools::getMaxResidentSetSizeBytes() {

      zx_info_task_stats_t task_stats;

      zx_handle_t process = zx_process_self();

      zx_status_t status = zx_object_get_info(

      process, ZX_INFO_TASK_STATS, &task_stats, sizeof(task_stats), nullptr, nullptr);

      if (status != ZX_OK) {

        return -1;

      }

      return (task_stats.mem_private_bytes + task_stats.mem_shared_bytes);

    }

#elif defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS) || defined(SK_BUILD_FOR_ANDROID)

    #include <sys/resource.h>

    int64_t sk_tools::getMaxResidentSetSizeBytes() {

        struct rusage ru;

        getrusage(RUSAGE_SELF, &ru);

    #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)

        return ru.ru_maxrss;         // Darwin reports bytes.

    #else

        return ru.ru_maxrss * 1024;  // Linux reports kilobytes.

    #endif

    }

#elif defined(SK_BUILD_FOR_WIN)

    #include <windows.h>

    #include <psapi.h>

    int64_t sk_tools::getMaxResidentSetSizeBytes() {

        PROCESS_MEMORY_COUNTERS info;

        GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));

        return info.PeakWorkingSetSize;

    }

#else

    int64_t sk_tools::getMaxResidentSetSizeBytes() { return -1; }

#endif

#if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)

    #include <mach/mach.h>

    int64_t sk_tools::getCurrResidentSetSizeBytes() {

        mach_task_basic_info info;

        mach_msg_type_number_t count = MACH_TASK_BASIC_INFO_COUNT;

        if (KERN_SUCCESS !=

                task_info(mach_task_self(), MACH_TASK_BASIC_INFO, (task_info_t)&info, &count)) {

            return -1;

        }

        return info.resident_size;

    }

#elif defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_ANDROID)  // N.B. /proc is Linux-only.

    #include <unistd.h>

    #include <stdio.h>

    int64_t sk_tools::getCurrResidentSetSizeBytes() {

        const long pageSize = sysconf(_SC_PAGESIZE);

        long long rssPages = 0;

        if (FILE* statm = fopen("/proc/self/statm", "r")) {

            // statm contains: program-size rss shared text lib data dirty, all in page counts.

            int rc = fscanf(statm, "%*d %lld", &rssPages);

            fclose(statm);

            if (rc != 1) {

                return -1;

            }

        }

        return rssPages * pageSize;

    }

#elif defined(SK_BUILD_FOR_WIN)

    int64_t sk_tools::getCurrResidentSetSizeBytes() {

        PROCESS_MEMORY_COUNTERS info;

        GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));

        return info.WorkingSetSize;

    }

#else

    int64_t sk_tools::getCurrResidentSetSizeBytes() { return -1; }

#endif

int sk_tools::getMaxResidentSetSizeMB() {

    int64_t bytes = sk_tools::getMaxResidentSetSizeBytes();

    return bytes < 0 ? -1 : static_cast<int>(bytes / 1024 / 1024);

}

int sk_tools::getCurrResidentSetSizeMB() {

    int64_t bytes = sk_tools::getCurrResidentSetSizeBytes();

    return bytes < 0 ? -1 : static_cast<int>(bytes / 1024 / 1024);

}