// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#![cfg_attr(feature = "oom_with_hook", feature(alloc_error_hook))]

extern crate geckoservo;

extern crate app_services_logger;
#[cfg(feature = "cubeb-remoting")]
extern crate audioipc_client;
#[cfg(feature = "cubeb-remoting")]
extern crate audioipc_server;
extern crate authenticator;
#[cfg(feature = "bitsdownload")]
extern crate bitsdownload;
#[cfg(feature = "moz_places")]
extern crate bookmark_sync;
extern crate cascade_bloom_filter;
extern crate cert_storage;
extern crate chardetng_c;
extern crate cosec;
#[cfg(feature = "cubeb_coreaudio_rust")]
extern crate cubeb_coreaudio;
#[cfg(feature = "cubeb_pulse_rust")]
extern crate cubeb_pulse;
extern crate encoding_glue;
#[cfg(feature = "rust_fxa_client")]
extern crate firefox_accounts_bridge;
#[cfg(feature = "glean")]
extern crate fog_control;
extern crate gkrust_utils;
extern crate http_sfv;
extern crate jsrust_shared;
extern crate kvstore;
extern crate l10nregistry_ffi;
extern crate mapped_hyph;
extern crate mozurl;
extern crate mp4parse_capi;
extern crate netwerk_helper;
extern crate nserror;
extern crate nsstring;
extern crate prefs_parser;
extern crate processtools;
#[cfg(feature = "gecko_profiler")]
extern crate profiler_helper;
extern crate rsdparsa_capi;
extern crate shift_or_euc_c;
extern crate static_prefs;
extern crate storage;
#[cfg(feature = "quantum_render")]
extern crate webrender_bindings;
extern crate xpcom;
#[cfg(feature = "new_xulstore")]
extern crate xulstore;

extern crate audio_thread_priority;

#[cfg(not(target_os = "android"))]
extern crate webext_storage_bridge;

#[cfg(feature = "webrtc")]
extern crate mdns_service;
extern crate neqo_glue;
#[cfg(feature = "webgpu")]
extern crate wgpu_bindings;

#[cfg(feature = "wasm_library_sandboxing")]
extern crate rlbox_lucet_sandbox;

extern crate qcms;

extern crate unic_langid;
extern crate unic_langid_ffi;

extern crate fluent_langneg;
extern crate fluent_langneg_ffi;

extern crate fluent;
extern crate fluent_ffi;

#[cfg(not(target_os = "android"))]
extern crate viaduct;

#[cfg(feature = "remote")]
extern crate remote;

extern crate gecko_logger;

#[cfg(feature = "oxidized_breakpad")]
extern crate rust_minidump_writer_linux;

extern crate log;
use log::info;

use std::{ffi::CStr, os::raw::c_char};

use gecko_logger::GeckoLogger;

#[no_mangle]
pub extern "C" fn GkRust_Init() {
    // Initialize logging.
    let _ = GeckoLogger::init();
}

#[no_mangle]
pub extern "C" fn GkRust_Shutdown() {}

/// Used to implement `nsIDebug2::RustPanic` for testing purposes.
#[no_mangle]
pub extern "C" fn intentional_panic(message: *const c_char) {
    panic!("{}", unsafe { CStr::from_ptr(message) }.to_string_lossy());
}

/// Used to implement `nsIDebug2::rustLog` for testing purposes.
#[no_mangle]
pub extern "C" fn debug_log(target: *const c_char, message: *const c_char) {
    unsafe {
        // NOTE: The `info!` log macro is used here because we have the `release_max_level_info` feature set.
        info!(target: CStr::from_ptr(target).to_str().unwrap(), "{}", CStr::from_ptr(message).to_str().unwrap());
    }
}

#[cfg(feature = "oom_with_hook")]
mod oom_hook {
    use std::alloc::{set_alloc_error_hook, Layout};

    extern "C" {
        fn GeckoHandleOOM(size: usize) -> !;
    }

    pub fn hook(layout: Layout) {
        unsafe {
            GeckoHandleOOM(layout.size());
        }
    }

    pub fn install() {
        set_alloc_error_hook(hook);
    }
}

#[no_mangle]
pub extern "C" fn install_rust_oom_hook() {
    #[cfg(feature = "oom_with_hook")]
    oom_hook::install();
}

#[cfg(feature = "moz_memory")]
mod moz_memory {
    use std::alloc::{GlobalAlloc, Layout};
    use std::os::raw::c_void;

    extern "C" {
        fn malloc(size: usize) -> *mut c_void;

        fn free(ptr: *mut c_void);

        fn calloc(nmemb: usize, size: usize) -> *mut c_void;

        fn realloc(ptr: *mut c_void, size: usize) -> *mut c_void;

        #[cfg(windows)]
        fn _aligned_malloc(size: usize, align: usize) -> *mut c_void;

        #[cfg(not(windows))]
        fn memalign(align: usize, size: usize) -> *mut c_void;
    }

    #[cfg(windows)]
    unsafe fn memalign(align: usize, size: usize) -> *mut c_void {
        _aligned_malloc(size, align)
    }

    pub struct GeckoAlloc;

    #[inline(always)]
    fn need_memalign(layout: Layout) -> bool {
        // mozjemalloc guarantees a minimum alignment of 16 for all sizes, except
        // for size classes below 16 (4 and 8).
        layout.align() > layout.size() || layout.align() > 16
    }

    unsafe impl GlobalAlloc for GeckoAlloc {
        unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
            if need_memalign(layout) {
                memalign(layout.align(), layout.size()) as *mut u8
            } else {
                malloc(layout.size()) as *mut u8
            }
        }

        unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
            free(ptr as *mut c_void)
        }

        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
            if need_memalign(layout) {
                let ptr = self.alloc(layout);
                if !ptr.is_null() {
                    std::ptr::write_bytes(ptr, 0, layout.size());
                }
                ptr
            } else {
                calloc(1, layout.size()) as *mut u8
            }
        }

        unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
            let new_layout = Layout::from_size_align_unchecked(new_size, layout.align());
            if need_memalign(new_layout) {
                let new_ptr = self.alloc(new_layout);
                if !new_ptr.is_null() {
                    let size = std::cmp::min(layout.size(), new_size);
                    std::ptr::copy_nonoverlapping(ptr, new_ptr, size);
                    self.dealloc(ptr, layout);
                }
                new_ptr
            } else {
                realloc(ptr as *mut c_void, new_size) as *mut u8
            }
        }
    }
}

#[cfg(feature = "moz_memory")]
#[global_allocator]
static A: moz_memory::GeckoAlloc = moz_memory::GeckoAlloc;