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Merge pull request #24742 from ziglang/CountingWriter

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std.Io: delete CountingWriter
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Andrew Kelley 2025-08-08 12:30:09 -07:00 • committed by GitHub
commit d2f7792039
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11 changed files with 76 additions and 119 deletions
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11
lib/compiler/resinator/cvtres.zig
View file

@ -665,19 +665,16 @@ const ResourceTree = struct {
pub fn writeCoff(
self: *const ResourceTree,
allocator: Allocator,
writer: anytype,
w: anytype,
resources_in_data_order: []const Resource,
lengths: Lengths,
coff_string_table: *StringTable,
) ![]const std.coff.Symbol {
if (self.type_to_name_map.count() == 0) {
try writer.writeByteNTimes(0, 16);
try w.writeByteNTimes(0, 16);
return &.{};
}
var counting_writer = std.io.countingWriter(writer);
const w = counting_writer.writer();
var level2_list: std.ArrayListUnmanaged(*const NameToLanguageMap) = .empty;
defer level2_list.deinit(allocator);
@ -735,7 +732,6 @@ const ResourceTree = struct {
try level2_list.append(allocator, name_to_lang_map);
}
}
std.debug.assert(counting_writer.bytes_written == level2_start);
const level3_start = level2_start + lengths.level2;
var level3_address = level3_start;
@ -771,7 +767,6 @@ const ResourceTree = struct {
try level3_list.append(allocator, lang_to_resources_map);
}
}
std.debug.assert(counting_writer.bytes_written == level3_start);
var reloc_addresses = try allocator.alloc(u32, resources_in_data_order.len);
defer allocator.free(reloc_addresses);
@ -813,7 +808,6 @@ const ResourceTree = struct {
try resources_list.append(allocator, reloc_resource);
}
}
std.debug.assert(counting_writer.bytes_written == data_entries_start);
for (resources_list.items, 0..) |reloc_resource, i| {
// TODO: This logic works but is convoluted, would be good to clean this up
@ -827,7 +821,6 @@ const ResourceTree = struct {
};
try w.writeStructEndian(data_entry, .little);
}
std.debug.assert(counting_writer.bytes_written == strings_start);
for (self.rsrc_string_table.keys()) |v| {
const str = v.name;

5
lib/std/Io.zig
View file

@ -432,10 +432,6 @@ pub const FixedBufferStream = @import("Io/fixed_buffer_stream.zig").FixedBufferS
/// Deprecated in favor of `Reader`.
pub const fixedBufferStream = @import("Io/fixed_buffer_stream.zig").fixedBufferStream;
/// Deprecated with no replacement; inefficient pattern
pub const CountingWriter = @import("Io/counting_writer.zig").CountingWriter;
/// Deprecated with no replacement; inefficient pattern
pub const countingWriter = @import("Io/counting_writer.zig").countingWriter;
/// Deprecated with no replacement; inefficient pattern
pub const CountingReader = @import("Io/counting_reader.zig").CountingReader;
/// Deprecated with no replacement; inefficient pattern
pub const countingReader = @import("Io/counting_reader.zig").countingReader;
@ -917,7 +913,6 @@ test {
_ = Reader;
_ = Writer;
_ = BufferedWriter;
_ = CountingWriter;
_ = CountingReader;
_ = FixedBufferStream;
_ = tty;

5
lib/std/Io/Writer.zig
View file

@ -2239,6 +2239,11 @@ pub const Discarding = struct {
};
}
/// Includes buffered data (no need to flush).
pub fn fullCount(d: *const Discarding) u64 {
return d.count + d.writer.end;
}
pub fn drain(w: *Writer, data: []const []const u8, splat: usize) Error!usize {
const d: *Discarding = @alignCast(@fieldParentPtr("writer", w));
const slice = data[0 .. data.len - 1];

39
lib/std/Io/counting_writer.zig
View file

@ -1,39 +0,0 @@
const std = @import("../std.zig");
const io = std.io;
const testing = std.testing;
/// A Writer that counts how many bytes has been written to it.
pub fn CountingWriter(comptime WriterType: type) type {
return struct {
bytes_written: u64,
child_stream: WriterType,
pub const Error = WriterType.Error;
pub const Writer = io.GenericWriter(*Self, Error, write);
const Self = @This();
pub fn write(self: *Self, bytes: []const u8) Error!usize {
const amt = try self.child_stream.write(bytes);
self.bytes_written += amt;
return amt;
}
pub fn writer(self: *Self) Writer {
return .{ .context = self };
}
};
}
pub fn countingWriter(child_stream: anytype) CountingWriter(@TypeOf(child_stream)) {
return .{ .bytes_written = 0, .child_stream = child_stream };
}
test CountingWriter {
var counting_stream = countingWriter(std.io.null_writer);
const stream = counting_stream.writer();
const bytes = "yay" ** 100;
stream.writeAll(bytes) catch unreachable;
try testing.expect(counting_stream.bytes_written == bytes.len);
}

16
lib/std/crypto/phc_encoding.zig
View file

@ -5,6 +5,7 @@ const fmt = std.fmt;
const io = std.io;
const mem = std.mem;
const meta = std.meta;
const Writer = std.Io.Writer;
const fields_delimiter = "$";
const fields_delimiter_scalar = '$';
@ -188,19 +189,20 @@ pub fn deserialize(comptime HashResult: type, str: []const u8) Error!HashResult
///
/// `params` can also include any additional parameters.
pub fn serialize(params: anytype, str: []u8) Error![]const u8 {
var buf = io.fixedBufferStream(str);
try serializeTo(params, buf.writer());
return buf.getWritten();
var w: Writer = .fixed(str);
serializeTo(params, &w) catch return error.NoSpaceLeft;
return w.buffered();
}
/// Compute the number of bytes required to serialize `params`
pub fn calcSize(params: anytype) usize {
var buf = io.countingWriter(io.null_writer);
serializeTo(params, buf.writer()) catch unreachable;
return @as(usize, @intCast(buf.bytes_written));
var trash: [128]u8 = undefined;
var d: Writer.Discarding = .init(&trash);
serializeTo(params, &d.writer) catch unreachable;
return @intCast(d.fullCount());
}
fn serializeTo(params: anytype, out: anytype) !void {
fn serializeTo(params: anytype, out: *std.Io.Writer) !void {
const HashResult = @TypeOf(params);
if (@hasField(HashResult, version_param_name)) {

7
lib/std/crypto/scrypt.zig
View file

@ -311,9 +311,10 @@ const crypt_format = struct {
/// Compute the number of bytes required to serialize `params`
pub fn calcSize(params: anytype) usize {
var buf = io.countingWriter(io.null_writer);
serializeTo(params, buf.writer()) catch unreachable;
return @as(usize, @intCast(buf.bytes_written));
var trash: [128]u8 = undefined;
var d: std.Io.Writer.Discarding = .init(&trash);
serializeTo(params, &d) catch unreachable;
return @intCast(d.fullCount());
}
fn serializeTo(params: anytype, out: anytype) !void {

7
src/arch/x86_64/encoder.zig
View file

@ -1204,11 +1204,10 @@ const TestEncode = struct {
mnemonic: Instruction.Mnemonic,
ops: []const Instruction.Operand,
) !void {
var stream = std.io.fixedBufferStream(&enc.buffer);
var count_writer = std.io.countingWriter(stream.writer());
var writer: std.Io.Writer = .fixed(&enc.buffer);
const inst: Instruction = try .new(.none, mnemonic, ops);
try inst.encode(count_writer.writer(), .{});
enc.index = count_writer.bytes_written;
try inst.encode(&writer, .{});
enc.index = writer.bufferedLen();
}
fn code(enc: TestEncode) []const u8 {

60
src/link/Dwarf.zig
View file

@ -1,4 +1,4 @@
gpa: std.mem.Allocator,
gpa: Allocator,
bin_file: *link.File,
format: DW.Format,
endian: std.builtin.Endian,
@ -21,6 +21,7 @@ debug_rnglists: DebugRngLists,
debug_str: StringSection,
pub const UpdateError = error{
WriteFailed,
ReinterpretDeclRef,
Unimplemented,
EndOfStream,
@ -50,7 +51,7 @@ const ModInfo = struct {
dirs: std.AutoArrayHashMapUnmanaged(Unit.Index, void),
files: std.AutoArrayHashMapUnmanaged(Zcu.File.Index, void),
fn deinit(mod_info: *ModInfo, gpa: std.mem.Allocator) void {
fn deinit(mod_info: *ModInfo, gpa: Allocator) void {
mod_info.dirs.deinit(gpa);
mod_info.files.deinit(gpa);
mod_info.* = undefined;
@ -220,7 +221,7 @@ const StringSection = struct {
.section = Section.init,
};
fn deinit(str_sec: *StringSection, gpa: std.mem.Allocator) void {
fn deinit(str_sec: *StringSection, gpa: Allocator) void {
str_sec.contents.deinit(gpa);
str_sec.map.deinit(gpa);
str_sec.section.deinit(gpa);
@ -297,7 +298,7 @@ pub const Section = struct {
.len = 0,
};
fn deinit(sec: *Section, gpa: std.mem.Allocator) void {
fn deinit(sec: *Section, gpa: Allocator) void {
for (sec.units.items) |*unit| unit.deinit(gpa);
sec.units.deinit(gpa);
sec.* = undefined;
@ -357,7 +358,7 @@ pub const Section = struct {
if (sec.last == unit.toOptional()) sec.last = unit_ptr.prev;
}
fn popUnit(sec: *Section, gpa: std.mem.Allocator) void {
fn popUnit(sec: *Section, gpa: Allocator) void {
const unit_index: Unit.Index = @enumFromInt(sec.units.items.len - 1);
sec.unlinkUnit(unit_index);
var unit = sec.units.pop().?;
@ -518,7 +519,7 @@ const Unit = struct {
unit.cross_section_relocs.clearRetainingCapacity();
}
fn deinit(unit: *Unit, gpa: std.mem.Allocator) void {
fn deinit(unit: *Unit, gpa: Allocator) void {
for (unit.entries.items) |*entry| entry.deinit(gpa);
unit.entries.deinit(gpa);
unit.cross_unit_relocs.deinit(gpa);
@ -526,7 +527,7 @@ const Unit = struct {
unit.* = undefined;
}
fn addEntry(unit: *Unit, gpa: std.mem.Allocator) std.mem.Allocator.Error!Entry.Index {
fn addEntry(unit: *Unit, gpa: Allocator) Allocator.Error!Entry.Index {
if (unit.free.unwrap()) |entry| {
const entry_ptr = unit.getEntry(entry);
unit.free = entry_ptr.next;
@ -780,7 +781,7 @@ const Entry = struct {
entry.external_relocs.clearRetainingCapacity();
}
fn deinit(entry: *Entry, gpa: std.mem.Allocator) void {
fn deinit(entry: *Entry, gpa: Allocator) void {
entry.cross_entry_relocs.deinit(gpa);
entry.cross_unit_relocs.deinit(gpa);
entry.cross_section_relocs.deinit(gpa);
@ -1133,7 +1134,7 @@ pub const Loc = union(enum) {
};
}
fn writeReg(reg: u32, op0: u8, opx: u8, writer: anytype) @TypeOf(writer).Error!void {
fn writeReg(reg: u32, op0: u8, opx: u8, writer: anytype) !void {
if (std.math.cast(u5, reg)) |small_reg| {
try writer.writeByte(op0 + small_reg);
} else {
@ -1142,7 +1143,7 @@ pub const Loc = union(enum) {
}
}
fn write(loc: Loc, adapter: anytype) UpdateError!void {
fn write(loc: Loc, adapter: anytype) !void {
const writer = adapter.writer();
switch (loc) {
.empty => {},
@ -1712,15 +1713,15 @@ pub const WipNav = struct {
wip_nav.func = func;
}
fn externalReloc(wip_nav: *WipNav, sec: *Section, reloc: ExternalReloc) std.mem.Allocator.Error!void {
fn externalReloc(wip_nav: *WipNav, sec: *Section, reloc: ExternalReloc) Allocator.Error!void {
try sec.getUnit(wip_nav.unit).getEntry(wip_nav.entry).external_relocs.append(wip_nav.dwarf.gpa, reloc);
}
pub fn infoExternalReloc(wip_nav: *WipNav, reloc: ExternalReloc) std.mem.Allocator.Error!void {
pub fn infoExternalReloc(wip_nav: *WipNav, reloc: ExternalReloc) Allocator.Error!void {
try wip_nav.externalReloc(&wip_nav.dwarf.debug_info.section, reloc);
}
fn frameExternalReloc(wip_nav: *WipNav, reloc: ExternalReloc) std.mem.Allocator.Error!void {
fn frameExternalReloc(wip_nav: *WipNav, reloc: ExternalReloc) Allocator.Error!void {
try wip_nav.externalReloc(&wip_nav.dwarf.debug_frame.section, reloc);
}
@ -1768,33 +1769,33 @@ pub const WipNav = struct {
}
const ExprLocCounter = struct {
const Stream = std.io.CountingWriter(std.io.NullWriter);
stream: Stream,
stream: Writer.Discarding,
section_offset_bytes: u32,
address_size: AddressSize,
fn init(dwarf: *Dwarf) ExprLocCounter {
fn init(dwarf: *Dwarf, trash_buffer: []u8) ExprLocCounter {
return .{
.stream = std.io.countingWriter(std.io.null_writer),
.stream = .init(trash_buffer),
.section_offset_bytes = dwarf.sectionOffsetBytes(),
.address_size = dwarf.address_size,
};
}
fn writer(counter: *ExprLocCounter) Stream.Writer {
return counter.stream.writer();
fn writer(counter: *ExprLocCounter) *Writer {
return &counter.stream.writer;
}
fn endian(_: ExprLocCounter) std.builtin.Endian {
return @import("builtin").cpu.arch.endian();
}
fn addrSym(counter: *ExprLocCounter, _: u32) error{}!void {
counter.stream.bytes_written += @intFromEnum(counter.address_size);
counter.stream.count += @intFromEnum(counter.address_size);
}
fn infoEntry(counter: *ExprLocCounter, _: Unit.Index, _: Entry.Index) error{}!void {
counter.stream.bytes_written += counter.section_offset_bytes;
counter.stream.count += counter.section_offset_bytes;
}
};
fn infoExprLoc(wip_nav: *WipNav, loc: Loc) UpdateError!void {
var counter: ExprLocCounter = .init(wip_nav.dwarf);
var trash_buffer: [64]u8 = undefined;
var counter: ExprLocCounter = .init(wip_nav.dwarf, &trash_buffer);
try loc.write(&counter);
const adapter: struct {
@ -1812,7 +1813,7 @@ pub const WipNav = struct {
try ctx.wip_nav.infoSectionOffset(.debug_info, unit, entry, 0);
}
} = .{ .wip_nav = wip_nav };
try uleb128(adapter.writer(), counter.stream.bytes_written);
try uleb128(adapter.writer(), counter.stream.fullCount());
try loc.write(adapter);
}
@ -1826,7 +1827,8 @@ pub const WipNav = struct {
}
fn frameExprLoc(wip_nav: *WipNav, loc: Loc) UpdateError!void {
var counter: ExprLocCounter = .init(wip_nav.dwarf);
var trash_buffer: [64]u8 = undefined;
var counter: ExprLocCounter = .init(wip_nav.dwarf, &trash_buffer);
try loc.write(&counter);
const adapter: struct {
@ -1844,7 +1846,7 @@ pub const WipNav = struct {
try ctx.wip_nav.sectionOffset(.debug_frame, .debug_info, unit, entry, 0);
}
} = .{ .wip_nav = wip_nav };
try uleb128(adapter.writer(), counter.stream.bytes_written);
try uleb128(adapter.writer(), counter.stream.fullCount());
try loc.write(adapter);
}
@ -1922,7 +1924,7 @@ pub const WipNav = struct {
try wip_nav.infoSectionOffset(.debug_info, unit, entry, 0);
}
fn refForward(wip_nav: *WipNav) std.mem.Allocator.Error!u32 {
fn refForward(wip_nav: *WipNav) Allocator.Error!u32 {
const dwarf = wip_nav.dwarf;
const cross_entry_relocs = &dwarf.debug_info.section.getUnit(wip_nav.unit).getEntry(wip_nav.entry).cross_entry_relocs;
const reloc_index: u32 = @intCast(cross_entry_relocs.items.len);
@ -6022,14 +6024,14 @@ fn sectionOffsetBytes(dwarf: *Dwarf) u32 {
fn uleb128Bytes(value: anytype) u32 {
var trash_buffer: [64]u8 = undefined;
var d: std.Io.Writer.Discarding = .init(&trash_buffer);
var d: Writer.Discarding = .init(&trash_buffer);
d.writer.writeUleb128(value) catch unreachable;
return @intCast(d.count + d.writer.end);
}
fn sleb128Bytes(value: anytype) u32 {
var trash_buffer: [64]u8 = undefined;
var d: std.Io.Writer.Discarding = .init(&trash_buffer);
var d: Writer.Discarding = .init(&trash_buffer);
d.writer.writeSleb128(value) catch unreachable;
return @intCast(d.count + d.writer.end);
}
@ -6057,3 +6059,5 @@ const sleb128 = std.leb.writeIleb128;
const std = @import("std");
const target_info = @import("../target.zig");
const uleb128 = std.leb.writeUleb128;
const Allocator = std.mem.Allocator;
const Writer = std.Io.Writer;

9
src/link/Elf.zig
View file

@ -3152,10 +3152,11 @@ fn writeSyntheticSections(self: *Elf) !void {
if (self.section_indexes.gnu_hash) |shndx| {
const shdr = slice.items(.shdr)[shndx];
var buffer = try std.ArrayList(u8).initCapacity(gpa, self.gnu_hash.size());
defer buffer.deinit();
try self.gnu_hash.write(self, buffer.writer());
try self.pwriteAll(buffer.items, shdr.sh_offset);
var aw: std.Io.Writer.Allocating = .init(gpa);
try aw.ensureUnusedCapacity(self.gnu_hash.size());
defer aw.deinit();
try self.gnu_hash.write(self, &aw.writer);
try self.pwriteAll(aw.getWritten(), shdr.sh_offset);
}
if (self.section_indexes.versym) |shndx| {

21
src/link/Elf/synthetic_sections.zig
View file

@ -1237,17 +1237,14 @@ pub const GnuHashSection = struct {
return header_size + hash.num_bloom * 8 + hash.num_buckets * 4 + hash.num_exports * 4;
}
pub fn write(hash: GnuHashSection, elf_file: *Elf, writer: anytype) !void {
pub fn write(hash: GnuHashSection, elf_file: *Elf, writer: *std.Io.Writer) !void {
const exports = getExports(elf_file);
const export_off = elf_file.dynsym.count() - hash.num_exports;
var counting = std.io.countingWriter(writer);
const cwriter = counting.writer();
try cwriter.writeInt(u32, hash.num_buckets, .little);
try cwriter.writeInt(u32, export_off, .little);
try cwriter.writeInt(u32, hash.num_bloom, .little);
try cwriter.writeInt(u32, bloom_shift, .little);
try writer.writeInt(u32, hash.num_buckets, .little);
try writer.writeInt(u32, export_off, .little);
try writer.writeInt(u32, hash.num_bloom, .little);
try writer.writeInt(u32, bloom_shift, .little);
const comp = elf_file.base.comp;
const gpa = comp.gpa;
@ -1271,7 +1268,7 @@ pub const GnuHashSection = struct {
bloom[idx] |= @as(u64, 1) << @as(u6, @intCast((h >> bloom_shift) % 64));
}
try cwriter.writeAll(mem.sliceAsBytes(bloom));
try writer.writeAll(mem.sliceAsBytes(bloom));
// Fill in the hash bucket indices
const buckets = try gpa.alloc(u32, hash.num_buckets);
@ -1284,7 +1281,7 @@ pub const GnuHashSection = struct {
}
}
try cwriter.writeAll(mem.sliceAsBytes(buckets));
try writer.writeAll(mem.sliceAsBytes(buckets));
// Finally, write the hash table
const table = try gpa.alloc(u32, hash.num_exports);
@ -1300,9 +1297,7 @@ pub const GnuHashSection = struct {
}
}
try cwriter.writeAll(mem.sliceAsBytes(table));
assert(counting.bytes_written == hash.size());
try writer.writeAll(mem.sliceAsBytes(table));
}
pub fn hasher(name: [:0]const u8) u32 {

15
src/link/MachO/dyld_info/Trie.zig
View file

@ -186,17 +186,18 @@ const FinalizeNodeResult = struct {
/// Updates offset of this node in the output byte stream.
fn finalizeNode(self: *Trie, node_index: Node.Index, offset_in_trie: u32) !FinalizeNodeResult {
var stream = std.io.countingWriter(std.io.null_writer);
const writer = stream.writer();
var trash_buffer: [64]u8 = undefined;
var stream: std.Io.Writer.Discarding = .init(&trash_buffer);
const writer = &stream.writer;
const slice = self.nodes.slice();
var node_size: u32 = 0;
if (slice.items(.is_terminal)[node_index]) {
const export_flags = slice.items(.export_flags)[node_index];
const vmaddr_offset = slice.items(.vmaddr_offset)[node_index];
try leb.writeUleb128(writer, export_flags);
try leb.writeUleb128(writer, vmaddr_offset);
try leb.writeUleb128(writer, stream.bytes_written);
try writer.writeUleb128(export_flags);
try writer.writeUleb128(vmaddr_offset);
try writer.writeUleb128(stream.fullCount());
} else {
node_size += 1; // 0x0 for non-terminal nodes
}
@ -206,13 +207,13 @@ fn finalizeNode(self: *Trie, node_index: Node.Index, offset_in_trie: u32) !Final
const edge = &self.edges.items[edge_index];
const next_node_offset = slice.items(.trie_offset)[edge.node];
node_size += @intCast(edge.label.len + 1);
try leb.writeUleb128(writer, next_node_offset);
try writer.writeUleb128(next_node_offset);
}
const trie_offset = slice.items(.trie_offset)[node_index];
const updated = offset_in_trie != trie_offset;
slice.items(.trie_offset)[node_index] = offset_in_trie;
node_size += @intCast(stream.bytes_written);
node_size += @intCast(stream.fullCount());
return .{ .node_size = node_size, .updated = updated };
}