Merge pull request #5158 from ziglang/zir-to-elf

beginnings of (non-LLVM) self-hosted machine code generation and linking

Author: andrewrk

lib/std/fs.zig

@@ -1345,8 +1345,10 @@ pub const Dir = struct {
         mode: File.Mode = File.default_mode,
     };
 
-    /// `dest_path` must remain valid for the lifetime of `AtomicFile`.
-    /// Call `AtomicFile.finish` to atomically replace `dest_path` with contents.
+    /// Directly access the `.file` field, and then call `AtomicFile.finish`
+    /// to atomically replace `dest_path` with contents.
+    /// Always call `AtomicFile.deinit` to clean up, regardless of whether `AtomicFile.finish` succeeded.
+    /// `dest_path` must remain valid until `AtomicFile.deinit` is called.
     pub fn atomicFile(self: Dir, dest_path: []const u8, options: AtomicFileOptions) !AtomicFile {
         if (path.dirname(dest_path)) |dirname| {
             const dir = try self.openDir(dirname, .{});

lib/std/fs/file.zig

@@ -93,7 +93,7 @@ pub const File = struct {
         /// This means that a process that does not respect the locking API can still get access
         /// to the file, despite the lock.
         ///
-        /// Windows' file locks are mandatory, and any process attempting to access the file will
+        /// Windows's file locks are mandatory, and any process attempting to access the file will
         /// receive an error.
         ///
         /// [1]: https://www.kernel.org/doc/Documentation/filesystems/mandatory-locking.txt

lib/std/mem.zig

@@ -2027,7 +2027,13 @@ test "sliceAsBytes and bytesAsSlice back" {
 /// Round an address up to the nearest aligned address
 /// The alignment must be a power of 2 and greater than 0.
 pub fn alignForward(addr: usize, alignment: usize) usize {
-    return alignBackward(addr + (alignment - 1), alignment);
+    return alignForwardGeneric(usize, addr, alignment);
+}
+
+/// Round an address up to the nearest aligned address
+/// The alignment must be a power of 2 and greater than 0.
+pub fn alignForwardGeneric(comptime T: type, addr: T, alignment: T) T {
+    return alignBackwardGeneric(T, addr + (alignment - 1), alignment);
 }
 
 test "alignForward" {
@@ -2048,8 +2054,14 @@ test "alignForward" {
 /// Round an address up to the previous aligned address
 /// The alignment must be a power of 2 and greater than 0.
 pub fn alignBackward(addr: usize, alignment: usize) usize {
-    assert(@popCount(usize, alignment) == 1);
-    // 000010000 // example addr
+    return alignBackwardGeneric(usize, addr, alignment);
+}
+
+/// Round an address up to the previous aligned address
+/// The alignment must be a power of 2 and greater than 0.
+pub fn alignBackwardGeneric(comptime T: type, addr: T, alignment: T) T {
+    assert(@popCount(T, alignment) == 1);
+    // 000010000 // example alignment
     // 000001111 // subtract 1
     // 111110000 // binary not
     return addr & ~(alignment - 1);