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// Export one of the malloc libraries.

#[cfg(feature = "malloc_jemalloc")]
pub use self::jemalloc::*;
#[cfg(not(any(feature = "malloc_jemalloc", feature = "malloc_mimalloc",)))]
pub use self::libc_malloc::*;
#[cfg(feature = "malloc_mimalloc")]
pub use self::mimalloc::*;

/// When we count page usage of library malloc, we assume they allocate in pages. For some malloc implementations,
/// they may use a larger page (e.g. mimalloc's 64K page). For libraries that we are not sure, we assume they use
/// normal 4k pages.
pub const BYTES_IN_MALLOC_PAGE: usize = 1 << LOG_BYTES_IN_MALLOC_PAGE;

// Different malloc libraries

// TODO: We should conditinally include some methods in the module, such as posix extension and GNU extension.

#[cfg(feature = "malloc_jemalloc")]
mod jemalloc {
    // Normal 4K page
    pub const LOG_BYTES_IN_MALLOC_PAGE: u8 = crate::util::constants::LOG_BYTES_IN_PAGE;
    // ANSI C
    pub use jemalloc_sys::{calloc, free, malloc, realloc};
    // Posix
    pub use jemalloc_sys::posix_memalign;
    // GNU
    pub use jemalloc_sys::malloc_usable_size;
}

#[cfg(feature = "malloc_mimalloc")]
mod mimalloc {
    // Normal 4K page accounting
    pub const LOG_BYTES_IN_MALLOC_PAGE: u8 = crate::util::constants::LOG_BYTES_IN_PAGE;
    // ANSI C
    pub use mimalloc_sys::{
        mi_calloc as calloc, mi_free as free, mi_malloc as malloc, mi_realloc as realloc,
    };
    // Posix
    pub use mimalloc_sys::mi_posix_memalign as posix_memalign;
    // GNU
    pub use mimalloc_sys::mi_malloc_usable_size as malloc_usable_size;
}

/// If no malloc lib is specified, use the libc implementation
#[cfg(not(any(feature = "malloc_jemalloc", feature = "malloc_mimalloc",)))]
mod libc_malloc {
    // Normal 4K page
    pub const LOG_BYTES_IN_MALLOC_PAGE: u8 = crate::util::constants::LOG_BYTES_IN_PAGE;
    // ANSI C
    pub use libc::{calloc, free, malloc, realloc};
    // Posix
    pub use libc::posix_memalign;
    // GNU
    #[cfg(target_os = "linux")]
    pub use libc::malloc_usable_size;
    #[cfg(target_os = "macos")]
    extern "C" {
        pub fn malloc_size(ptr: *const libc::c_void) -> usize;
    }
    #[cfg(target_os = "macos")]
    pub use self::malloc_size as malloc_usable_size;
}