Merge pull request #13560 from ziglang/wasi-bootstrap

Nuke the C++ implementation of Zig from orbit using WASI

1 files changed, 0 insertions, 1282 deletions

diff --git a/src/stage1/os.cpp b/src/stage1/os.cpp
deleted file mode 100644
index 776d2a2915..0000000000
--- a/src/stage1/os.cpp
+++ /dev/null
@@ -1,1282 +0,0 @@
-/*
- * Copyright (c) 2015 Andrew Kelley
- *
- * This file is part of zig, which is MIT licensed.
- * See http://opensource.org/licenses/MIT
- */
-
-#include "os.hpp"
-#include "buffer.hpp"
-#include "heap.hpp"
-#include "util.hpp"
-#include "error.hpp"
-#include "util_base.hpp"
-#include <stdint.h>
-#include <stdio.h>
-
-#if defined(_WIN32)
-
-#if !defined(NOMINMAX)
-#define NOMINMAX
-#endif
-
-#if !defined(VC_EXTRALEAN)
-#define VC_EXTRALEAN
-#endif
-
-#if !defined(WIN32_LEAN_AND_MEAN)
-#define WIN32_LEAN_AND_MEAN
-#endif
-
-#if !defined(_WIN32_WINNT)
-#define _WIN32_WINNT 0x600
-#endif
-
-#if !defined(NTDDI_VERSION)
-#define NTDDI_VERSION 0x06000000
-#endif
-
-#include <windows.h>
-#include <shlobj.h>
-#include <io.h>
-#include <fcntl.h>
-#include <ntsecapi.h>
-#include <math.h>
-
-// Workaround an upstream LLVM issue.
-// See https://github.com/ziglang/zig/issues/7614#issuecomment-752939981
-#if defined(_MSC_VER) && defined(_WIN64)
-typedef SSIZE_T ssize_t;
-#endif
-#else
-#define ZIG_OS_POSIX
-
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-#include <sys/resource.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <spawn.h>
-
-#endif
-
-#if defined(ZIG_OS_LINUX) || defined(ZIG_OS_FREEBSD) || defined(ZIG_OS_NETBSD) || defined(ZIG_OS_DRAGONFLY) || defined(ZIG_OS_OPENBSD) || defined(ZIG_OS_HAIKU)
-#include <link.h>
-#endif
-
-#if defined(ZIG_OS_LINUX)
-#include <sys/auxv.h>
-#endif
-
-#if defined(ZIG_OS_FREEBSD) || defined(ZIG_OS_NETBSD) || defined(ZIG_OS_DRAGONFLY) || defined(ZIG_OS_OPENBSD)
-#include <sys/sysctl.h>
-#endif
-
-#if defined(__MACH__)
-#include <mach/clock.h>
-#include <mach/mach.h>
-#include <mach-o/dyld.h>
-#endif
-
-#if defined(ZIG_OS_WINDOWS)
-static void utf16le_ptr_to_utf8(Buf *out, WCHAR *utf16le);
-static size_t utf8_to_utf16le(WCHAR *utf16_le, Slice<uint8_t> utf8);
-static uint64_t windows_perf_freq;
-#elif defined(__MACH__)
-static clock_serv_t macos_calendar_clock;
-static clock_serv_t macos_monotonic_clock;
-#endif
-
-#include <stdlib.h>
-#include <errno.h>
-#include <time.h>
-
-#if !defined(environ)
-extern char **environ;
-#endif
-
-void os_path_dirname(Buf *full_path, Buf *out_dirname) {
-    return os_path_split(full_path, out_dirname, nullptr);
-}
-
-bool os_is_sep(uint8_t c) {
-#if defined(ZIG_OS_WINDOWS)
-    return c == '\\' || c == '/';
-#else
-    return c == '/';
-#endif
-}
-
-void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename) {
-    size_t len = buf_len(full_path);
-    if (len != 0) {
-        size_t last_index = len - 1;
-        char last_char = buf_ptr(full_path)[last_index];
-        if (os_is_sep(last_char)) {
-            if (last_index == 0) {
-                if (out_dirname) buf_init_from_mem(out_dirname, &last_char, 1);
-                if (out_basename) buf_init_from_str(out_basename, "");
-                return;
-            }
-            last_index -= 1;
-        }
-        for (size_t i = last_index;;) {
-            uint8_t c = buf_ptr(full_path)[i];
-            if (os_is_sep(c)) {
-                if (out_dirname) {
-                    buf_init_from_mem(out_dirname, buf_ptr(full_path), (i == 0) ? 1 : i);
-                }
-                if (out_basename) {
-                    buf_init_from_mem(out_basename, buf_ptr(full_path) + i + 1, buf_len(full_path) - (i + 1));
-                }
-                return;
-            }
-            if (i == 0) break;
-            i -= 1;
-        }
-    }
-    if (out_dirname) buf_init_from_mem(out_dirname, ".", 1);
-    if (out_basename) buf_init_from_buf(out_basename, full_path);
-}
-
-void os_path_extname(Buf *full_path, Buf *out_basename, Buf *out_extname) {
-    if (buf_len(full_path) == 0) {
-        if (out_basename) buf_init_from_str(out_basename, "");
-        if (out_extname) buf_init_from_str(out_extname, "");
-        return;
-    }
-    size_t i = buf_len(full_path) - 1;
-    while (true) {
-        if (buf_ptr(full_path)[i] == '.') {
-            if (out_basename) {
-                buf_resize(out_basename, 0);
-                buf_append_mem(out_basename, buf_ptr(full_path), i);
-            }
-
-            if (out_extname) {
-                buf_resize(out_extname, 0);
-                buf_append_mem(out_extname, buf_ptr(full_path) + i, buf_len(full_path) - i);
-            }
-            return;
-        }
-
-        if (i == 0) {
-            if (out_basename) buf_init_from_buf(out_basename, full_path);
-            if (out_extname) buf_init_from_str(out_extname, "");
-            return;
-        }
-        i -= 1;
-    }
-}
-
-void os_path_join(Buf *dirname, Buf *basename, Buf *out_full_path) {
-    if (buf_len(dirname) == 0) {
-        buf_init_from_buf(out_full_path, basename);
-        return;
-    }
-
-    buf_init_from_buf(out_full_path, dirname);
-    uint8_t c = *(buf_ptr(out_full_path) + buf_len(out_full_path) - 1);
-    if (!os_is_sep(c))
-        buf_append_char(out_full_path, ZIG_OS_SEP_CHAR);
-    buf_append_buf(out_full_path, basename);
-}
-
-
-#if defined(ZIG_OS_WINDOWS)		
-// Ported from std/os/path.zig		
-static bool isAbsoluteWindows(Slice<uint8_t> path) {		
-    if (path.ptr[0] == '/')		
-        return true;		
-
-    if (path.ptr[0] == '\\') {		
-        return true;		
-    }		
-    if (path.len < 3) {		
-        return false;		
-    }		
-    if (path.ptr[1] == ':') {		
-        if (path.ptr[2] == '/')		
-            return true;		
-        if (path.ptr[2] == '\\')		
-            return true;		
-    }		
-    return false;		
-}		
-
-enum WindowsPathKind {
-    WindowsPathKindNone,
-    WindowsPathKindDrive,
-    WindowsPathKindNetworkShare,
-};
-
-struct WindowsPath {
-    Slice<uint8_t> disk_designator;
-    WindowsPathKind kind;
-    bool is_abs;
-};
-
-
-// Ported from std/os/path.zig
-static WindowsPath windowsParsePath(Slice<uint8_t> path) {
-    if (path.len >= 2 && path.ptr[1] == ':') {
-        return WindowsPath{
-            path.slice(0, 2),
-            WindowsPathKindDrive,
-            isAbsoluteWindows(path),
-        };
-    }
-    if (path.len >= 1 && (path.ptr[0] == '/' || path.ptr[0] == '\\') &&
-        (path.len == 1 || (path.ptr[1] != '/' && path.ptr[1] != '\\')))
-    {
-        return WindowsPath{
-            path.slice(0, 0),
-            WindowsPathKindNone,
-            true,
-        };
-    }
-    WindowsPath relative_path = {
-        str(""),
-        WindowsPathKindNone,
-        false,
-    };
-    if (path.len < strlen("//a/b")) {
-        return relative_path;
-    }
-
-    {
-        if (memStartsWith(path, str("//"))) {
-            if (path.ptr[2] == '/') {
-                return relative_path;
-            }
-
-            SplitIterator it = memSplit(path, str("/"));
-            {
-                Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
-                if (!opt_component.is_some) return relative_path;
-            }
-            {
-                Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
-                if (!opt_component.is_some) return relative_path;
-            }
-            return WindowsPath{
-                path.slice(0, it.index),
-                WindowsPathKindNetworkShare,
-                isAbsoluteWindows(path),
-            };
-        }
-    }
-    {
-        if (memStartsWith(path, str("\\\\"))) {
-            if (path.ptr[2] == '\\') {
-                return relative_path;
-            }
-
-            SplitIterator it = memSplit(path, str("\\"));
-            {
-                Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
-                if (!opt_component.is_some) return relative_path;
-            }
-            {
-                Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
-                if (!opt_component.is_some) return relative_path;
-            }
-            return WindowsPath{
-                path.slice(0, it.index),
-                WindowsPathKindNetworkShare,
-                isAbsoluteWindows(path),
-            };
-        }
-    }
-    return relative_path;
-}
-
-// Ported from std/os/path.zig
-static uint8_t asciiUpper(uint8_t byte) {
-    if (byte >= 'a' && byte <= 'z') {
-        return 'A' + (byte - 'a');
-    }
-    return byte;
-}
-
-// Ported from std/os/path.zig
-static bool asciiEqlIgnoreCase(Slice<uint8_t> s1, Slice<uint8_t> s2) {
-    if (s1.len != s2.len)
-        return false;
-    for (size_t i = 0; i < s1.len; i += 1) {
-        if (asciiUpper(s1.ptr[i]) != asciiUpper(s2.ptr[i]))
-            return false;
-    }
-    return true;
-}
-
-// Ported from std/os/path.zig
-static bool compareDiskDesignators(WindowsPathKind kind, Slice<uint8_t> p1, Slice<uint8_t> p2) {
-    switch (kind) {
-        case WindowsPathKindNone:
-            assert(p1.len == 0);
-            assert(p2.len == 0);
-            return true;
-        case WindowsPathKindDrive:
-            return asciiUpper(p1.ptr[0]) == asciiUpper(p2.ptr[0]);
-        case WindowsPathKindNetworkShare:
-            uint8_t sep1 = p1.ptr[0];
-            uint8_t sep2 = p2.ptr[0];
-
-            SplitIterator it1 = memSplit(p1, {&sep1, 1});
-            SplitIterator it2 = memSplit(p2, {&sep2, 1});
-
-            // TODO ASCII is wrong, we actually need full unicode support to compare paths.
-            return asciiEqlIgnoreCase(SplitIterator_next(&it1).value, SplitIterator_next(&it2).value) &&
-                asciiEqlIgnoreCase(SplitIterator_next(&it1).value, SplitIterator_next(&it2).value);
-    }
-    zig_unreachable();
-}
-
-// Ported from std/os/path.zig
-static Buf os_path_resolve_windows(Buf **paths_ptr, size_t paths_len) {
-    if (paths_len == 0) {
-        Buf cwd = BUF_INIT;
-        int err;
-        if ((err = os_get_cwd(&cwd))) {
-            zig_panic("get cwd failed");
-        }
-        return cwd;
-    }
-
-    // determine which disk designator we will result with, if any
-    char result_drive_buf[3] = {'_', ':', '\0'}; // 0 needed for strlen later
-    Slice<uint8_t> result_disk_designator = str("");
-    WindowsPathKind have_drive_kind = WindowsPathKindNone;
-    bool have_abs_path = false;
-    size_t first_index = 0;
-    size_t max_size = 0;
-    for (size_t i = 0; i < paths_len; i += 1) {
-        Slice<uint8_t> p = buf_to_slice(paths_ptr[i]);
-        WindowsPath parsed = windowsParsePath(p);
-        if (parsed.is_abs) {
-            have_abs_path = true;
-            first_index = i;
-            max_size = result_disk_designator.len;
-        }
-        switch (parsed.kind) {
-            case WindowsPathKindDrive:
-                result_drive_buf[0] = asciiUpper(parsed.disk_designator.ptr[0]);
-                result_disk_designator = str(result_drive_buf);
-                have_drive_kind = WindowsPathKindDrive;
-                break;
-            case WindowsPathKindNetworkShare:
-                result_disk_designator = parsed.disk_designator;
-                have_drive_kind = WindowsPathKindNetworkShare;
-                break;
-            case WindowsPathKindNone:
-                break;
-        }
-        max_size += p.len + 1;
-    }
-
-    // if we will result with a disk designator, loop again to determine
-    // which is the last time the disk designator is absolutely specified, if any
-    // and count up the max bytes for paths related to this disk designator
-    if (have_drive_kind != WindowsPathKindNone) {
-        have_abs_path = false;
-        first_index = 0;
-        max_size = result_disk_designator.len;
-        bool correct_disk_designator = false;
-
-        for (size_t i = 0; i < paths_len; i += 1) {
-            Slice<uint8_t> p = buf_to_slice(paths_ptr[i]);
-            WindowsPath parsed = windowsParsePath(p);
-            if (parsed.kind != WindowsPathKindNone) {
-                if (parsed.kind == have_drive_kind) {
-                    correct_disk_designator = compareDiskDesignators(have_drive_kind, result_disk_designator, parsed.disk_designator);
-                } else {
-                    continue;
-                }
-            }
-            if (!correct_disk_designator) {
-                continue;
-            }
-            if (parsed.is_abs) {
-                first_index = i;
-                max_size = result_disk_designator.len;
-                have_abs_path = true;
-            }
-            max_size += p.len + 1;
-        }
-    }
-
-    // Allocate result and fill in the disk designator, calling getCwd if we have to.
-    Slice<uint8_t> result;
-    size_t result_index = 0;
-
-    if (have_abs_path) {
-        switch (have_drive_kind) {
-            case WindowsPathKindDrive: {
-                result = Slice<uint8_t>::alloc(max_size);
-
-                memCopy(result, result_disk_designator);
-                result_index += result_disk_designator.len;
-                break;
-            }
-            case WindowsPathKindNetworkShare: {
-                result = Slice<uint8_t>::alloc(max_size);
-                SplitIterator it = memSplit(buf_to_slice(paths_ptr[first_index]), str("/\\"));
-                Slice<uint8_t> server_name = SplitIterator_next(&it).value;
-                Slice<uint8_t> other_name = SplitIterator_next(&it).value;
-
-                result.ptr[result_index] = '\\';
-                result_index += 1;
-                result.ptr[result_index] = '\\';
-                result_index += 1;
-                memCopy(result.sliceFrom(result_index), server_name);
-                result_index += server_name.len;
-                result.ptr[result_index] = '\\';
-                result_index += 1;
-                memCopy(result.sliceFrom(result_index), other_name);
-                result_index += other_name.len;
-
-                result_disk_designator = result.slice(0, result_index);
-                break;
-            }
-            case WindowsPathKindNone: {
-                Buf cwd = BUF_INIT;
-                int err;
-                if ((err = os_get_cwd(&cwd))) {
-                    zig_panic("get cwd failed");
-                }
-                WindowsPath parsed_cwd = windowsParsePath(buf_to_slice(&cwd));
-                result = Slice<uint8_t>::alloc(max_size + parsed_cwd.disk_designator.len + 1);
-                memCopy(result, parsed_cwd.disk_designator);
-                result_index += parsed_cwd.disk_designator.len;
-                result_disk_designator = result.slice(0, parsed_cwd.disk_designator.len);
-                if (parsed_cwd.kind == WindowsPathKindDrive) {
-                    result.ptr[0] = asciiUpper(result.ptr[0]);
-                }
-                have_drive_kind = parsed_cwd.kind;
-                break;
-            }
-        }
-    } else {
-        // TODO call get cwd for the result_disk_designator instead of the global one
-        Buf cwd = BUF_INIT;
-        int err;
-        if ((err = os_get_cwd(&cwd))) {
-            zig_panic("get cwd failed");
-        }
-        result = Slice<uint8_t>::alloc(max_size + buf_len(&cwd) + 1);
-
-        memCopy(result, buf_to_slice(&cwd));
-        result_index += buf_len(&cwd);
-        WindowsPath parsed_cwd = windowsParsePath(result.slice(0, result_index));
-        result_disk_designator = parsed_cwd.disk_designator;
-        if (parsed_cwd.kind == WindowsPathKindDrive) {
-            result.ptr[0] = asciiUpper(result.ptr[0]);
-            // Remove the trailing slash if present, eg. if the cwd is a root
-            // directory.
-            if (buf_ends_with_mem(&cwd, "\\", 1)) {
-                result_index -= 1;
-            }
-        }
-        have_drive_kind = parsed_cwd.kind;
-    }
-
-    // Now we know the disk designator to use, if any, and what kind it is. And our result
-    // is big enough to append all the paths to.
-    bool correct_disk_designator = true;
-    for (size_t i = first_index; i < paths_len; i += 1) {
-        Slice<uint8_t> p = buf_to_slice(paths_ptr[i]);
-        WindowsPath parsed = windowsParsePath(p);
-
-        if (parsed.kind != WindowsPathKindNone) {
-            if (parsed.kind == have_drive_kind) {
-                correct_disk_designator = compareDiskDesignators(have_drive_kind, result_disk_designator, parsed.disk_designator);
-            } else {
-                continue;
-            }
-        }
-        if (!correct_disk_designator) {
-            continue;
-        }
-        SplitIterator it = memSplit(p.sliceFrom(parsed.disk_designator.len), str("/\\"));
-        while (true) {
-            Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
-            if (!opt_component.is_some) break;
-            Slice<uint8_t> component = opt_component.value;
-            if (memEql(component, str("."))) {
-                continue;
-            } else if (memEql(component, str(".."))) {
-                while (true) {
-                    if (result_index == 0 || result_index == result_disk_designator.len)
-                        break;
-                    result_index -= 1;
-                    if (result.ptr[result_index] == '\\' || result.ptr[result_index] == '/')
-                        break;
-                }
-            } else {
-                result.ptr[result_index] = '\\';
-                result_index += 1;
-                memCopy(result.sliceFrom(result_index), component);
-                result_index += component.len;
-            }
-        }
-    }
-
-    if (result_index == result_disk_designator.len) {
-        result.ptr[result_index] = '\\';
-        result_index += 1;
-    }
-
-    Buf return_value = BUF_INIT;
-    buf_init_from_mem(&return_value, (char *)result.ptr, result_index);
-    return return_value;
-}
-#endif
-
-#if defined(ZIG_OS_POSIX)
-// Ported from std/os/path.zig
-static Buf os_path_resolve_posix(Buf **paths_ptr, size_t paths_len) {
-    if (paths_len == 0) {
-        Buf cwd = BUF_INIT;
-        int err;
-        if ((err = os_get_cwd(&cwd))) {
-            zig_panic("get cwd failed");
-        }
-        return cwd;
-    }
-
-    size_t first_index = 0;
-    bool have_abs = false;
-    size_t max_size = 0;
-    for (size_t i = 0; i < paths_len; i += 1) {
-        Buf *p = paths_ptr[i];
-        if (buf_ptr(p)[0] == '/') {
-            first_index = i;
-            have_abs = true;
-            max_size = 0;
-        }
-        max_size += buf_len(p) + 1;
-    }
-
-    uint8_t *result_ptr;
-    size_t result_len;
-    size_t result_index = 0;
-
-    if (have_abs) {
-        result_len = max_size;
-        result_ptr = heap::c_allocator.allocate_nonzero<uint8_t>(result_len);
-    } else {
-        Buf cwd = BUF_INIT;
-        int err;
-        if ((err = os_get_cwd(&cwd))) {
-            zig_panic("get cwd failed");
-        }
-        result_len = max_size + buf_len(&cwd) + 1;
-        result_ptr = heap::c_allocator.allocate_nonzero<uint8_t>(result_len);
-        memcpy(result_ptr, buf_ptr(&cwd), buf_len(&cwd));
-        result_index += buf_len(&cwd);
-    }
-
-    for (size_t i = first_index; i < paths_len; i += 1) {
-        Buf *p = paths_ptr[i];
-        SplitIterator it = memSplit(buf_to_slice(p), str("/"));
-        while (true) {
-            Optional<Slice<uint8_t>> opt_component = SplitIterator_next(&it);
-            if (!opt_component.is_some) break;
-            Slice<uint8_t> component = opt_component.value;
-
-            if (memEql<uint8_t>(component, str("."))) {
-                continue;
-            } else if (memEql<uint8_t>(component, str(".."))) {
-                while (true) {
-                    if (result_index == 0)
-                        break;
-                    result_index -= 1;
-                    if (result_ptr[result_index] == '/')
-                        break;
-                }
-            } else {
-                result_ptr[result_index] = '/';
-                result_index += 1;
-                memcpy(result_ptr + result_index, component.ptr, component.len);
-                result_index += component.len;
-            }
-        }
-    }
-
-    if (result_index == 0) {
-        result_ptr[0] = '/';
-        result_index += 1;
-    }
-
-    Buf return_value = BUF_INIT;
-    buf_init_from_mem(&return_value, (char *)result_ptr, result_index);
-    heap::c_allocator.deallocate(result_ptr, result_len);
-    return return_value;
-}
-#endif
-
-// Ported from std/os/path.zig
-Buf os_path_resolve(Buf **paths_ptr, size_t paths_len) {
-#if defined(ZIG_OS_WINDOWS)
-    return os_path_resolve_windows(paths_ptr, paths_len);
-#elif defined(ZIG_OS_POSIX)
-    return os_path_resolve_posix(paths_ptr, paths_len);
-#else
-#error "missing os_path_resolve implementation"
-#endif
-}
-
-Error os_fetch_file(FILE *f, Buf *out_buf) {
-    static const ssize_t buf_size = 0x2000;
-    buf_resize(out_buf, buf_size);
-    ssize_t actual_buf_len = 0;
-
-    for (;;) {
-        size_t amt_read = fread(buf_ptr(out_buf) + actual_buf_len, 1, buf_size, f);
-        actual_buf_len += amt_read;
-
-        if (amt_read != buf_size) {
-            if (feof(f)) {
-                buf_resize(out_buf, actual_buf_len);
-                return ErrorNone;
-            } else {
-                return ErrorFileSystem;
-            }
-        }
-
-        buf_resize(out_buf, actual_buf_len + buf_size);
-    }
-    zig_unreachable();
-}
-
-Error os_write_file(Buf *full_path, Buf *contents) {
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace path_space = slice_to_prefixed_file_w(buf_to_slice(full_path));
-    FILE *f = _wfopen(&path_space.data.items[0], L"wb");
-#else
-    FILE *f = fopen(buf_ptr(full_path), "wb");
-#endif
-    if (!f) {
-        zig_panic("os_write_file failed for %s", buf_ptr(full_path));
-    }
-    size_t amt_written = fwrite(buf_ptr(contents), 1, buf_len(contents), f);
-    if (amt_written != (size_t)buf_len(contents))
-        zig_panic("write failed: %s", strerror(errno));
-    if (fclose(f))
-        zig_panic("close failed");
-    return ErrorNone;
-}
-
-static Error copy_open_files(FILE *src_f, FILE *dest_f) {
-    static const size_t buf_size = 2048;
-    char buf[buf_size];
-    for (;;) {
-        size_t amt_read = fread(buf, 1, buf_size, src_f);
-        if (amt_read != buf_size) {
-            if (ferror(src_f)) {
-                return ErrorFileSystem;
-            }
-        }
-        size_t amt_written = fwrite(buf, 1, amt_read, dest_f);
-        if (amt_written != amt_read) {
-            return ErrorFileSystem;
-        }
-        if (feof(src_f)) {
-            return ErrorNone;
-        }
-    }
-}
-
-Error os_copy_file(Buf *src_path, Buf *dest_path) {
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace src_path_space = slice_to_prefixed_file_w(buf_to_slice(src_path));
-    FILE *src_f = _wfopen(&src_path_space.data.items[0], L"rb");
-#else
-    FILE *src_f = fopen(buf_ptr(src_path), "rb");
-#endif
-    if (!src_f) {
-        int err = errno;
-        if (err == ENOENT) {
-            return ErrorFileNotFound;
-        } else if (err == EACCES || err == EPERM) {
-            return ErrorAccess;
-        } else {
-            return ErrorFileSystem;
-        }
-    }
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace dest_path_space = slice_to_prefixed_file_w(buf_to_slice(dest_path));
-    FILE *dest_f = _wfopen(&dest_path_space.data.items[0], L"wb");
-#else
-    FILE *dest_f = fopen(buf_ptr(dest_path), "wb");
-#endif
-    if (!dest_f) {
-        int err = errno;
-        if (err == ENOENT) {
-            fclose(src_f);
-            return ErrorFileNotFound;
-        } else if (err == EACCES || err == EPERM) {
-            fclose(src_f);
-            return ErrorAccess;
-        } else {
-            fclose(src_f);
-            return ErrorFileSystem;
-        }
-    }
-    Error err = copy_open_files(src_f, dest_f);
-    fclose(src_f);
-    fclose(dest_f);
-    return err;
-}
-
-Error os_fetch_file_path(Buf *full_path, Buf *out_contents) {
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace path_space = slice_to_prefixed_file_w(buf_to_slice(full_path));
-    FILE *f = _wfopen(&path_space.data.items[0], L"rb");
-#else
-    FILE *f = fopen(buf_ptr(full_path), "rb");
-#endif
-    if (!f) {
-        switch (errno) {
-            case EACCES:
-                return ErrorAccess;
-            case EINTR:
-                return ErrorInterrupted;
-            case EINVAL:
-                return ErrorInvalidFilename;
-            case ENFILE:
-            case ENOMEM:
-                return ErrorSystemResources;
-            case ENOENT:
-                return ErrorFileNotFound;
-            default:
-                return ErrorFileSystem;
-        }
-    }
-    Error result = os_fetch_file(f, out_contents);
-    fclose(f);
-    return result;
-}
-
-Error os_get_cwd(Buf *out_cwd) {
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace path_space;
-    if (GetCurrentDirectoryW(PATH_MAX_WIDE, &path_space.data.items[0]) == 0) {
-        zig_panic("GetCurrentDirectory failed");
-    }
-    utf16le_ptr_to_utf8(out_cwd, &path_space.data.items[0]);
-    return ErrorNone;
-#elif defined(ZIG_OS_POSIX)
-    char buf[PATH_MAX];
-    char *res = getcwd(buf, PATH_MAX);
-    if (res == nullptr) {
-        zig_panic("unable to get cwd: %s", strerror(errno));
-    }
-    buf_init_from_str(out_cwd, res);
-    return ErrorNone;
-#else
-#error "missing os_get_cwd implementation"
-#endif
-}
-
-#if defined(ZIG_OS_WINDOWS)
-#define is_wprefix(s, prefix) \
-    (wcsncmp((s), (prefix), sizeof(prefix) / sizeof(WCHAR) - 1) == 0)
-static bool is_stderr_cyg_pty(void) {
-    HANDLE stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
-    if (stderr_handle == INVALID_HANDLE_VALUE)
-        return false;
-
-    const int size = sizeof(FILE_NAME_INFO) + sizeof(WCHAR) * MAX_PATH;
-    FILE_NAME_INFO *nameinfo;
-    WCHAR *p = NULL;
-
-    // Cygwin/msys's pty is a pipe.
-    if (GetFileType(stderr_handle) != FILE_TYPE_PIPE) {
-        return 0;
-    }
-    nameinfo = reinterpret_cast<FILE_NAME_INFO *>(heap::c_allocator.allocate<char>(size));
-    if (nameinfo == NULL) {
-        return 0;
-    }
-    // Check the name of the pipe:
-    // '\{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master'
-    if (GetFileInformationByHandleEx(stderr_handle, FileNameInfo, nameinfo, size)) {
-        nameinfo->FileName[nameinfo->FileNameLength / sizeof(WCHAR)] = L'\0';
-        p = nameinfo->FileName;
-        if (is_wprefix(p, L"\\cygwin-")) {      /* Cygwin */
-            p += 8;
-        } else if (is_wprefix(p, L"\\msys-")) { /* MSYS and MSYS2 */
-            p += 6;
-        } else {
-            p = NULL;
-        }
-        if (p != NULL) {
-            while (*p && isxdigit(*p))  /* Skip 16-digit hexadecimal. */
-                ++p;
-            if (is_wprefix(p, L"-pty")) {
-                p += 4;
-            } else {
-                p = NULL;
-            }
-        }
-        if (p != NULL) {
-            while (*p && isdigit(*p))   /* Skip pty number. */
-                ++p;
-            if (is_wprefix(p, L"-from-master")) {
-                //p += 12;
-            } else if (is_wprefix(p, L"-to-master")) {
-                //p += 10;
-            } else {
-                p = NULL;
-            }
-        }
-    }
-    heap::c_allocator.deallocate(reinterpret_cast<char *>(nameinfo), size);
-    return (p != NULL);
-}
-#endif
-
-bool os_stderr_supports_color(void) {
-    if (getenv("NO_COLOR") != NULL) return false;
-#if defined(ZIG_OS_WINDOWS)
-    return _isatty(_fileno(stderr)) != 0 || is_stderr_cyg_pty();
-#elif defined(ZIG_OS_POSIX)
-    return isatty(STDERR_FILENO) != 0;
-#else
-#error "missing os_stderr_supports_color implementation"
-#endif
-}
-
-Error os_rename(Buf *src_path, Buf *dest_path) {
-    if (buf_eql_buf(src_path, dest_path)) {
-        return ErrorNone;
-    }
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace src_path_space = slice_to_prefixed_file_w(buf_to_slice(src_path));
-    PathSpace dest_path_space = slice_to_prefixed_file_w(buf_to_slice(dest_path));
-    if (!MoveFileExW(&src_path_space.data.items[0], &dest_path_space.data.items[0], MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH)) {
-        return ErrorFileSystem;
-    }
-#else
-    if (rename(buf_ptr(src_path), buf_ptr(dest_path)) == -1) {
-        return ErrorFileSystem;
-    }
-#endif
-    return ErrorNone;
-}
-
-OsTimeStamp os_timestamp_monotonic(void) {
-    OsTimeStamp result;
-#if defined(ZIG_OS_WINDOWS)
-    uint64_t counts;
-    QueryPerformanceCounter((LARGE_INTEGER*)&counts);
-    result.sec = counts / windows_perf_freq;
-    result.nsec = (counts % windows_perf_freq) * 1000000000u / windows_perf_freq;
-#elif defined(__MACH__)
-    mach_timespec_t mts;
-
-    kern_return_t err = clock_get_time(macos_monotonic_clock, &mts);
-    assert(!err);
-
-    result.sec = mts.tv_sec;
-    result.nsec = mts.tv_nsec;
-#else
-    struct timespec tms;
-    clock_gettime(CLOCK_MONOTONIC, &tms);
-
-    result.sec = tms.tv_sec;
-    result.nsec = tms.tv_nsec;
-#endif
-    return result;
-}
-
-Error os_make_path(Buf *path) {
-    Buf resolved_path = os_path_resolve(&path, 1);
-
-    size_t end_index = buf_len(&resolved_path);
-    Error err;
-    while (true) {
-        if ((err = os_make_dir(buf_slice(&resolved_path, 0, end_index)))) {
-            if (err == ErrorPathAlreadyExists) {
-                if (end_index == buf_len(&resolved_path))
-                    return ErrorNone;
-            } else if (err == ErrorFileNotFound) {
-                // march end_index backward until next path component
-                while (true) {
-                    end_index -= 1;
-                    if (os_is_sep(buf_ptr(&resolved_path)[end_index]))
-                        break;
-                }
-                continue;
-            } else {
-                return err;
-            }
-        }
-        if (end_index == buf_len(&resolved_path))
-            return ErrorNone;
-        // march end_index forward until next path component
-        while (true) {
-            end_index += 1;
-            if (end_index == buf_len(&resolved_path) || os_is_sep(buf_ptr(&resolved_path)[end_index]))
-                break;
-        }
-    }
-    return ErrorNone;
-}
-
-Error os_make_dir(Buf *path) {
-#if defined(ZIG_OS_WINDOWS)
-    PathSpace path_space = slice_to_prefixed_file_w(buf_to_slice(path));
-    
-    if (!CreateDirectoryW(&path_space.data.items[0], NULL)) {
-        if (GetLastError() == ERROR_ALREADY_EXISTS)
-            return ErrorPathAlreadyExists;
-        if (GetLastError() == ERROR_PATH_NOT_FOUND)
-            return ErrorFileNotFound;
-        if (GetLastError() == ERROR_ACCESS_DENIED)
-            return ErrorAccess;
-        return ErrorUnexpected;
-    }
-    return ErrorNone;
-#else
-    if (mkdir(buf_ptr(path), 0755) == -1) {
-        if (errno == EEXIST)
-            return ErrorPathAlreadyExists;
-        if (errno == ENOENT)
-            return ErrorFileNotFound;
-        if (errno == EACCES)
-            return ErrorAccess;
-        return ErrorUnexpected;
-    }
-    return ErrorNone;
-#endif
-}
-
-
-int os_init(void) {
-#if defined(ZIG_OS_WINDOWS)
-    _setmode(fileno(stdout), _O_BINARY);
-    _setmode(fileno(stderr), _O_BINARY);
-    if (!QueryPerformanceFrequency((LARGE_INTEGER*)&windows_perf_freq)) {
-        return ErrorSystemResources;
-    }
-#elif defined(__MACH__)
-    host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &macos_monotonic_clock);
-    host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &macos_calendar_clock);
-#endif
-    return 0;
-}
-
-#define VT_RED "\x1b[31;1m"
-#define VT_GREEN "\x1b[32;1m"
-#define VT_CYAN "\x1b[36;1m"
-#define VT_WHITE "\x1b[37;1m"
-#define VT_BOLD "\x1b[0;1m"
-#define VT_RESET "\x1b[0m"
-
-static void set_color_posix(TermColor color) {
-    switch (color) {
-        case TermColorRed:
-            fprintf(stderr, VT_RED);
-            break;
-        case TermColorGreen:
-            fprintf(stderr, VT_GREEN);
-            break;
-        case TermColorCyan:
-            fprintf(stderr, VT_CYAN);
-            break;
-        case TermColorWhite:
-            fprintf(stderr, VT_WHITE);
-            break;
-        case TermColorBold:
-            fprintf(stderr, VT_BOLD);
-            break;
-        case TermColorReset:
-            fprintf(stderr, VT_RESET);
-            break;
-    }
-}
-
-
-#if defined(ZIG_OS_WINDOWS)
-bool got_orig_console_attrs = false;
-WORD original_console_attributes = FOREGROUND_RED|FOREGROUND_GREEN|FOREGROUND_BLUE;
-#endif
-
-void os_stderr_set_color(TermColor color) {
-#if defined(ZIG_OS_WINDOWS)
-    if (is_stderr_cyg_pty()) {
-        set_color_posix(color);
-        return;
-    }
-    HANDLE stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
-    if (stderr_handle == INVALID_HANDLE_VALUE)
-        zig_panic("unable to get stderr handle");
-    fflush(stderr);
-
-    if (!got_orig_console_attrs) {
-        got_orig_console_attrs = true;
-        CONSOLE_SCREEN_BUFFER_INFO info;
-        if (GetConsoleScreenBufferInfo(stderr_handle, &info)) {
-            original_console_attributes = info.wAttributes;
-        }
-    }
-
-    switch (color) {
-        case TermColorRed:
-            SetConsoleTextAttribute(stderr_handle, FOREGROUND_RED|FOREGROUND_INTENSITY);
-            break;
-        case TermColorGreen:
-            SetConsoleTextAttribute(stderr_handle, FOREGROUND_GREEN|FOREGROUND_INTENSITY);
-            break;
-        case TermColorCyan:
-            SetConsoleTextAttribute(stderr_handle, FOREGROUND_GREEN|FOREGROUND_BLUE|FOREGROUND_INTENSITY);
-            break;
-        case TermColorWhite:
-        case TermColorBold:
-            SetConsoleTextAttribute(stderr_handle,
-                FOREGROUND_RED|FOREGROUND_GREEN|FOREGROUND_BLUE|FOREGROUND_INTENSITY);
-            break;
-        case TermColorReset:
-            SetConsoleTextAttribute(stderr_handle, original_console_attributes);
-            break;
-    }
-#else
-    set_color_posix(color);
-#endif
-}
-
-#if defined(ZIG_OS_WINDOWS)
-// Ported from std/unicode.zig
-struct Utf16LeIterator {
-    uint8_t *bytes;
-    size_t i;
-};
-
-// Ported from std/unicode.zig
-static Utf16LeIterator Utf16LeIterator_init(WCHAR *ptr) {
-    return {(uint8_t*)ptr, 0};
-}
-
-// Ported from std/unicode.zig
-static Optional<uint32_t> Utf16LeIterator_nextCodepoint(Utf16LeIterator *it) {
-    if (it->bytes[it->i] == 0 && it->bytes[it->i + 1] == 0)
-        return {};
-    uint32_t c0 = ((uint32_t)it->bytes[it->i]) | (((uint32_t)it->bytes[it->i + 1]) << 8);
-    if ((c0 & ~((uint32_t)0x03ff)) == 0xd800) {
-        // surrogate pair
-        it->i += 2;
-        assert(it->bytes[it->i] != 0 || it->bytes[it->i + 1] != 0);
-        uint32_t c1 = ((uint32_t)it->bytes[it->i]) | (((uint32_t)it->bytes[it->i + 1]) << 8);
-        assert((c1 & ~((uint32_t)0x03ff)) == 0xdc00);
-        it->i += 2;
-        return Optional<uint32_t>::some(0x10000 + (((c0 & 0x03ff) << 10) | (c1 & 0x03ff)));
-    } else {
-        assert((c0 & ~((uint32_t)0x03ff)) != 0xdc00);
-        it->i += 2;
-        return Optional<uint32_t>::some(c0);
-    }
-}
-
-// Ported from std/unicode.zig
-static uint8_t utf8CodepointSequenceLength(uint32_t c) {
-    if (c < 0x80) return 1;
-    if (c < 0x800) return 2;
-    if (c < 0x10000) return 3;
-    if (c < 0x110000) return 4;
-    zig_unreachable();
-}
-
-// Ported from std.unicode.utf8ByteSequenceLength
-static uint8_t utf8ByteSequenceLength(uint8_t first_byte) {
-    if (first_byte < 0b10000000) return 1;
-    if ((first_byte & 0b11100000) == 0b11000000) return 2;
-    if ((first_byte & 0b11110000) == 0b11100000) return 3;
-    if ((first_byte & 0b11111000) == 0b11110000) return 4;
-    zig_unreachable();
-}
-
-// Ported from std/unicode.zig
-static size_t utf8Encode(uint32_t c, Slice<uint8_t> out) {
-    size_t length = utf8CodepointSequenceLength(c);
-    assert(out.len >= length);
-    switch (length) {
-        // The pattern for each is the same
-        // - Increasing the initial shift by 6 each time
-        // - Each time after the first shorten the shifted
-        //   value to a max of 0b111111 (63)
-        case 1:
-            out.ptr[0] = c; // Can just do 0 + codepoint for initial range
-            break;
-        case 2:
-            out.ptr[0] = 0b11000000 | (c >> 6);
-            out.ptr[1] = 0b10000000 | (c & 0b111111);
-            break;
-        case 3:
-            assert(!(0xd800 <= c && c <= 0xdfff));
-            out.ptr[0] = 0b11100000 | (c >> 12);
-            out.ptr[1] = 0b10000000 | ((c >> 6) & 0b111111);
-            out.ptr[2] = 0b10000000 | (c & 0b111111);
-            break;
-        case 4:
-            out.ptr[0] = 0b11110000 | (c >> 18);
-            out.ptr[1] = 0b10000000 | ((c >> 12) & 0b111111);
-            out.ptr[2] = 0b10000000 | ((c >> 6) & 0b111111);
-            out.ptr[3] = 0b10000000 | (c & 0b111111);
-            break;
-        default:
-            zig_unreachable();
-    }
-    return length;
-}
-
-// Ported from std.unicode.utf8Decode2
-static uint32_t utf8Decode2(Slice<uint8_t> bytes) {
-    assert(bytes.len == 2);
-    assert((bytes.at(0) & 0b11100000) == 0b11000000);
-
-    uint32_t value = bytes.at(0) & 0b00011111;
-    assert((bytes.at(1) & 0b11000000) == 0b10000000);
-    value <<= 6;
-    value |= bytes.at(1) & 0b00111111;
-
-    assert(value >= 0x80);
-    return value;
-}
-
-// Ported from std.unicode.utf8Decode3
-static uint32_t utf8Decode3(Slice<uint8_t> bytes) {
-    assert(bytes.len == 3);
-    assert((bytes.at(0) & 0b11110000) == 0b11100000);
-
-    uint32_t value = bytes.at(0) & 0b00001111;
-    assert((bytes.at(1) & 0b11000000) == 0b10000000);
-    value <<= 6;
-    value |= bytes.at(1) & 0b00111111;
-
-    assert((bytes.at(2) & 0b11000000) == 0b10000000);
-    value <<= 6;
-    value |= bytes.at(2) & 0b00111111;
-
-    assert(value >= 0x80);
-    assert(value < 0xd800 || value > 0xdfff);
-    return value;
-}
-
-// Ported from std.unicode.utf8Decode4
-static uint32_t utf8Decode4(Slice<uint8_t> bytes) {
-    assert(bytes.len == 4);
-    assert((bytes.at(0) & 0b11111000) == 0b11110000);
-
-    uint32_t value = bytes.at(0) & 0b00000111;
-    assert((bytes.at(1) & 0b11000000) == 0b10000000);
-    value <<= 6;
-    value |= bytes.at(1) & 0b00111111;
-
-    assert((bytes.at(2) & 0b11000000) == 0b10000000);
-    value <<= 6;
-    value |= bytes.at(2) & 0b00111111;
-
-    assert((bytes.at(3) & 0b11000000) == 0b10000000);
-    value <<= 6;
-    value |= bytes.at(3) & 0b00111111;
-
-    assert(value >= 0x10000 && value <= 0x10FFFF);
-    return value;
-}
-
-// Ported from std.unicode.utf8Decode
-static uint32_t utf8Decode(Slice<uint8_t> bytes) {
-    switch (bytes.len) {
-        case 1:
-            return bytes.at(0);
-            break;
-        case 2:
-            return utf8Decode2(bytes);
-            break;
-        case 3:
-            return utf8Decode3(bytes);
-            break;
-        case 4:
-            return utf8Decode4(bytes);
-            break;
-        default:
-            zig_unreachable();
-    }
-}
-// Ported from std.unicode.utf16leToUtf8Alloc
-static void utf16le_ptr_to_utf8(Buf *out, WCHAR *utf16le) {
-    // optimistically guess that it will all be ascii.
-    buf_resize(out, 0);
-    size_t out_index = 0;
-    Utf16LeIterator it = Utf16LeIterator_init(utf16le);
-    for (;;) {
-        Optional<uint32_t> opt_codepoint = Utf16LeIterator_nextCodepoint(&it);
-        if (!opt_codepoint.is_some) break;
-        uint32_t codepoint = opt_codepoint.value;
-
-        size_t utf8_len = utf8CodepointSequenceLength(codepoint);
-        buf_resize(out, buf_len(out) + utf8_len);
-        utf8Encode(codepoint, {(uint8_t*)buf_ptr(out)+out_index, buf_len(out)-out_index});
-        out_index += utf8_len;
-    }
-}
-
-// Ported from std.unicode.utf8ToUtf16Le
-static size_t utf8_to_utf16le(WCHAR *utf16_le, Slice<uint8_t> utf8) {
-    size_t dest_i = 0;
-    size_t src_i = 0;
-    while (src_i < utf8.len) {
-        uint8_t n = utf8ByteSequenceLength(utf8.at(src_i));
-        size_t next_src_i = src_i + n;
-        uint32_t codepoint = utf8Decode(utf8.slice(src_i, next_src_i));
-        if (codepoint < 0x10000) {
-            utf16_le[dest_i] = codepoint;
-            dest_i += 1;
-        } else {
-            WCHAR high = ((codepoint - 0x10000) >> 10) + 0xD800;
-            WCHAR low = (codepoint & 0x3FF) + 0xDC00;
-            utf16_le[dest_i] = high;
-            utf16_le[dest_i + 1] = low;
-            dest_i += 2;
-        }
-        src_i = next_src_i;
-    }
-    return dest_i;
-}
-
-// Ported from std.os.windows.sliceToPrefixedFileW
-PathSpace slice_to_prefixed_file_w(Slice<uint8_t> path) {
-    PathSpace path_space;
-    for (size_t idx = 0; idx < path.len; idx++) {
-        assert(path.ptr[idx] != '*' && path.ptr[idx] != '?' && path.ptr[idx] != '"' &&
-               path.ptr[idx] != '<' && path.ptr[idx] != '>' && path.ptr[idx] != '|');
-    }
-
-    size_t start_index;
-    if (memStartsWith(path, str("\\?")) || !isAbsoluteWindows(path)) {
-        start_index = 0;
-    } else {
-        static WCHAR prefix[4] = { u'\\', u'?', u'?', u'\\' };
-        memCopy(path_space.data.slice(), Slice<WCHAR> { prefix, 4 });
-        start_index = 4;
-    }
-
-    path_space.len = start_index + utf8_to_utf16le(path_space.data.slice().sliceFrom(start_index).ptr, path);
-    assert(path_space.len <= path_space.data.len);
-
-    Slice<WCHAR> path_slice = path_space.data.slice().slice(0, path_space.len);
-    for (size_t elem_idx = 0; elem_idx < path_slice.len; elem_idx += 1) {
-        if (path_slice.at(elem_idx) == '/') {
-            path_slice.at(elem_idx) = '\\';
-        }
-    }
-
-    path_space.data.items[path_space.len] = 0;
-    return path_space;
-}
-#endif