Deleted vendor folder

1 files changed, 0 insertions, 365 deletions

diff --git a/vendor/backtrace/src/dbghelp.rs b/vendor/backtrace/src/dbghelp.rs
deleted file mode 100644
index c81766b..0000000
--- a/vendor/backtrace/src/dbghelp.rs
+++ /dev/null
@@ -1,365 +0,0 @@
-//! A module to assist in managing dbghelp bindings on Windows
-//!
-//! Backtraces on Windows (at least for MSVC) are largely powered through
-//! `dbghelp.dll` and the various functions that it contains. These functions
-//! are currently loaded *dynamically* rather than linking to `dbghelp.dll`
-//! statically. This is currently done by the standard library (and is in theory
-//! required there), but is an effort to help reduce the static dll dependencies
-//! of a library since backtraces are typically pretty optional. That being
-//! said, `dbghelp.dll` almost always successfully loads on Windows.
-//!
-//! Note though that since we're loading all this support dynamically we can't
-//! actually use the raw definitions in `winapi`, but rather we need to define
-//! the function pointer types ourselves and use that. We don't really want to
-//! be in the business of duplicating winapi, so we have a Cargo feature
-//! `verify-winapi` which asserts that all bindings match those in winapi and
-//! this feature is enabled on CI.
-//!
-//! Finally, you'll note here that the dll for `dbghelp.dll` is never unloaded,
-//! and that's currently intentional. The thinking is that we can globally cache
-//! it and use it between calls to the API, avoiding expensive loads/unloads. If
-//! this is a problem for leak detectors or something like that we can cross the
-//! bridge when we get there.
-
-#![allow(non_snake_case)]
-
-use super::windows::*;
-use core::mem;
-use core::ptr;
-
-// Work around `SymGetOptions` and `SymSetOptions` not being present in winapi
-// itself. Otherwise this is only used when we're double-checking types against
-// winapi.
-#[cfg(feature = "verify-winapi")]
-mod dbghelp {
-    use crate::windows::*;
-    pub use winapi::um::dbghelp::{
-        StackWalk64, StackWalkEx, SymCleanup, SymFromAddrW, SymFunctionTableAccess64,
-        SymGetLineFromAddrW64, SymGetModuleBase64, SymGetOptions, SymInitializeW, SymSetOptions,
-    };
-
-    extern "system" {
-        // Not defined in winapi yet
-        pub fn SymFromInlineContextW(
-            hProcess: HANDLE,
-            Address: DWORD64,
-            InlineContext: ULONG,
-            Displacement: PDWORD64,
-            Symbol: PSYMBOL_INFOW,
-        ) -> BOOL;
-        pub fn SymGetLineFromInlineContextW(
-            hProcess: HANDLE,
-            dwAddr: DWORD64,
-            InlineContext: ULONG,
-            qwModuleBaseAddress: DWORD64,
-            pdwDisplacement: PDWORD,
-            Line: PIMAGEHLP_LINEW64,
-        ) -> BOOL;
-    }
-
-    pub fn assert_equal_types<T>(a: T, _b: T) -> T {
-        a
-    }
-}
-
-// This macro is used to define a `Dbghelp` structure which internally contains
-// all the function pointers that we might load.
-macro_rules! dbghelp {
-    (extern "system" {
-        $(fn $name:ident($($arg:ident: $argty:ty),*) -> $ret: ty;)*
-    }) => (
-        pub struct Dbghelp {
-            /// The loaded DLL for `dbghelp.dll`
-            dll: HMODULE,
-
-            // Each function pointer for each function we might use
-            $($name: usize,)*
-        }
-
-        static mut DBGHELP: Dbghelp = Dbghelp {
-            // Initially we haven't loaded the DLL
-            dll: 0 as *mut _,
-            // Initially all functions are set to zero to say they need to be
-            // dynamically loaded.
-            $($name: 0,)*
-        };
-
-        // Convenience typedef for each function type.
-        $(pub type $name = unsafe extern "system" fn($($argty),*) -> $ret;)*
-
-        impl Dbghelp {
-            /// Attempts to open `dbghelp.dll`. Returns success if it works or
-            /// error if `LoadLibraryW` fails.
-            ///
-            /// Panics if library is already loaded.
-            fn ensure_open(&mut self) -> Result<(), ()> {
-                if !self.dll.is_null() {
-                    return Ok(())
-                }
-                let lib = b"dbghelp.dll\0";
-                unsafe {
-                    self.dll = LoadLibraryA(lib.as_ptr() as *const i8);
-                    if self.dll.is_null() {
-                        Err(())
-                    }  else {
-                        Ok(())
-                    }
-                }
-            }
-
-            // Function for each method we'd like to use. When called it will
-            // either read the cached function pointer or load it and return the
-            // loaded value. Loads are asserted to succeed.
-            $(pub fn $name(&mut self) -> Option<$name> {
-                unsafe {
-                    if self.$name == 0 {
-                        let name = concat!(stringify!($name), "\0");
-                        self.$name = self.symbol(name.as_bytes())?;
-                    }
-                    let ret = mem::transmute::<usize, $name>(self.$name);
-                    #[cfg(feature = "verify-winapi")]
-                    dbghelp::assert_equal_types(ret, dbghelp::$name);
-                    Some(ret)
-                }
-            })*
-
-            fn symbol(&self, symbol: &[u8]) -> Option<usize> {
-                unsafe {
-                    match GetProcAddress(self.dll, symbol.as_ptr() as *const _) as usize {
-                        0 => None,
-                        n => Some(n),
-                    }
-                }
-            }
-        }
-
-        // Convenience proxy to use the cleanup locks to reference dbghelp
-        // functions.
-        #[allow(dead_code)]
-        impl Init {
-            $(pub fn $name(&self) -> $name {
-                unsafe {
-                    DBGHELP.$name().unwrap()
-                }
-            })*
-
-            pub fn dbghelp(&self) -> *mut Dbghelp {
-                unsafe {
-                    &mut DBGHELP
-                }
-            }
-        }
-    )
-
-}
-
-const SYMOPT_DEFERRED_LOADS: DWORD = 0x00000004;
-
-dbghelp! {
-    extern "system" {
-        fn SymGetOptions() -> DWORD;
-        fn SymSetOptions(options: DWORD) -> DWORD;
-        fn SymInitializeW(
-            handle: HANDLE,
-            path: PCWSTR,
-            invade: BOOL
-        ) -> BOOL;
-        fn SymCleanup(handle: HANDLE) -> BOOL;
-        fn StackWalk64(
-            MachineType: DWORD,
-            hProcess: HANDLE,
-            hThread: HANDLE,
-            StackFrame: LPSTACKFRAME64,
-            ContextRecord: PVOID,
-            ReadMemoryRoutine: PREAD_PROCESS_MEMORY_ROUTINE64,
-            FunctionTableAccessRoutine: PFUNCTION_TABLE_ACCESS_ROUTINE64,
-            GetModuleBaseRoutine: PGET_MODULE_BASE_ROUTINE64,
-            TranslateAddress: PTRANSLATE_ADDRESS_ROUTINE64
-        ) -> BOOL;
-        fn SymFunctionTableAccess64(
-            hProcess: HANDLE,
-            AddrBase: DWORD64
-        ) -> PVOID;
-        fn SymGetModuleBase64(
-            hProcess: HANDLE,
-            AddrBase: DWORD64
-        ) -> DWORD64;
-        fn SymFromAddrW(
-            hProcess: HANDLE,
-            Address: DWORD64,
-            Displacement: PDWORD64,
-            Symbol: PSYMBOL_INFOW
-        ) -> BOOL;
-        fn SymGetLineFromAddrW64(
-            hProcess: HANDLE,
-            dwAddr: DWORD64,
-            pdwDisplacement: PDWORD,
-            Line: PIMAGEHLP_LINEW64
-        ) -> BOOL;
-        fn StackWalkEx(
-            MachineType: DWORD,
-            hProcess: HANDLE,
-            hThread: HANDLE,
-            StackFrame: LPSTACKFRAME_EX,
-            ContextRecord: PVOID,
-            ReadMemoryRoutine: PREAD_PROCESS_MEMORY_ROUTINE64,
-            FunctionTableAccessRoutine: PFUNCTION_TABLE_ACCESS_ROUTINE64,
-            GetModuleBaseRoutine: PGET_MODULE_BASE_ROUTINE64,
-            TranslateAddress: PTRANSLATE_ADDRESS_ROUTINE64,
-            Flags: DWORD
-        ) -> BOOL;
-        fn SymFromInlineContextW(
-            hProcess: HANDLE,
-            Address: DWORD64,
-            InlineContext: ULONG,
-            Displacement: PDWORD64,
-            Symbol: PSYMBOL_INFOW
-        ) -> BOOL;
-        fn SymGetLineFromInlineContextW(
-            hProcess: HANDLE,
-            dwAddr: DWORD64,
-            InlineContext: ULONG,
-            qwModuleBaseAddress: DWORD64,
-            pdwDisplacement: PDWORD,
-            Line: PIMAGEHLP_LINEW64
-        ) -> BOOL;
-    }
-}
-
-pub struct Init {
-    lock: HANDLE,
-}
-
-/// Initialize all support necessary to access `dbghelp` API functions from this
-/// crate.
-///
-/// Note that this function is **safe**, it internally has its own
-/// synchronization. Also note that it is safe to call this function multiple
-/// times recursively.
-pub fn init() -> Result<Init, ()> {
-    use core::sync::atomic::{AtomicUsize, Ordering::SeqCst};
-
-    // Helper function for generating a name that's unique to the process.
-    fn mutex_name() -> [u8; 33] {
-        let mut name: [u8; 33] = *b"Local\\RustBacktraceMutex00000000\0";
-        let mut id = unsafe { GetCurrentProcessId() };
-        // Quick and dirty no alloc u32 to hex.
-        let mut index = name.len() - 1;
-        while id > 0 {
-            name[index - 1] = match (id & 0xF) as u8 {
-                h @ 0..=9 => b'0' + h,
-                h => b'A' + (h - 10),
-            };
-            id >>= 4;
-            index -= 1;
-        }
-        name
-    }
-
-    unsafe {
-        // First thing we need to do is to synchronize this function. This can
-        // be called concurrently from other threads or recursively within one
-        // thread. Note that it's trickier than that though because what we're
-        // using here, `dbghelp`, *also* needs to be synchronized with all other
-        // callers to `dbghelp` in this process.
-        //
-        // Typically there aren't really that many calls to `dbghelp` within the
-        // same process and we can probably safely assume that we're the only
-        // ones accessing it. There is, however, one primary other user we have
-        // to worry about which is ironically ourselves, but in the standard
-        // library. The Rust standard library depends on this crate for
-        // backtrace support, and this crate also exists on crates.io. This
-        // means that if the standard library is printing a panic backtrace it
-        // may race with this crate coming from crates.io, causing segfaults.
-        //
-        // To help solve this synchronization problem we employ a
-        // Windows-specific trick here (it is, after all, a Windows-specific
-        // restriction about synchronization). We create a *session-local* named
-        // mutex to protect this call. The intention here is that the standard
-        // library and this crate don't have to share Rust-level APIs to
-        // synchronize here but can instead work behind the scenes to make sure
-        // they're synchronizing with one another. That way when this function
-        // is called through the standard library or through crates.io we can be
-        // sure that the same mutex is being acquired.
-        //
-        // So all of that is to say that the first thing we do here is we
-        // atomically create a `HANDLE` which is a named mutex on Windows. We
-        // synchronize a bit with other threads sharing this function
-        // specifically and ensure that only one handle is created per instance
-        // of this function. Note that the handle is never closed once it's
-        // stored in the global.
-        //
-        // After we've actually go the lock we simply acquire it, and our `Init`
-        // handle we hand out will be responsible for dropping it eventually.
-        static LOCK: AtomicUsize = AtomicUsize::new(0);
-        let mut lock = LOCK.load(SeqCst);
-        if lock == 0 {
-            let name = mutex_name();
-            lock = CreateMutexA(ptr::null_mut(), 0, name.as_ptr().cast::<i8>()) as usize;
-            if lock == 0 {
-                return Err(());
-            }
-            if let Err(other) = LOCK.compare_exchange(0, lock, SeqCst, SeqCst) {
-                debug_assert!(other != 0);
-                CloseHandle(lock as HANDLE);
-                lock = other;
-            }
-        }
-        debug_assert!(lock != 0);
-        let lock = lock as HANDLE;
-        let r = WaitForSingleObjectEx(lock, INFINITE, FALSE);
-        debug_assert_eq!(r, 0);
-        let ret = Init { lock };
-
-        // Ok, phew! Now that we're all safely synchronized, let's actually
-        // start processing everything. First up we need to ensure that
-        // `dbghelp.dll` is actually loaded in this process. We do this
-        // dynamically to avoid a static dependency. This has historically been
-        // done to work around weird linking issues and is intended at making
-        // binaries a bit more portable since this is largely just a debugging
-        // utility.
-        //
-        // Once we've opened `dbghelp.dll` we need to call some initialization
-        // functions in it, and that's detailed more below. We only do this
-        // once, though, so we've got a global boolean indicating whether we're
-        // done yet or not.
-        DBGHELP.ensure_open()?;
-
-        static mut INITIALIZED: bool = false;
-        if INITIALIZED {
-            return Ok(ret);
-        }
-
-        let orig = DBGHELP.SymGetOptions().unwrap()();
-
-        // Ensure that the `SYMOPT_DEFERRED_LOADS` flag is set, because
-        // according to MSVC's own docs about this: "This is the fastest, most
-        // efficient way to use the symbol handler.", so let's do that!
-        DBGHELP.SymSetOptions().unwrap()(orig | SYMOPT_DEFERRED_LOADS);
-
-        // Actually initialize symbols with MSVC. Note that this can fail, but we
-        // ignore it. There's not a ton of prior art for this per se, but LLVM
-        // internally seems to ignore the return value here and one of the
-        // sanitizer libraries in LLVM prints a scary warning if this fails but
-        // basically ignores it in the long run.
-        //
-        // One case this comes up a lot for Rust is that the standard library and
-        // this crate on crates.io both want to compete for `SymInitializeW`. The
-        // standard library historically wanted to initialize then cleanup most of
-        // the time, but now that it's using this crate it means that someone will
-        // get to initialization first and the other will pick up that
-        // initialization.
-        DBGHELP.SymInitializeW().unwrap()(GetCurrentProcess(), ptr::null_mut(), TRUE);
-        INITIALIZED = true;
-        Ok(ret)
-    }
-}
-
-impl Drop for Init {
-    fn drop(&mut self) {
-        unsafe {
-            let r = ReleaseMutex(self.lock);
-            debug_assert!(r != 0);
-        }
-    }
-}