mirror of
https://github.com/ziglang/zig.git
synced 2025-12-13 17:53:07 +00:00
238 lines
8.8 KiB
Zig
238 lines
8.8 KiB
Zig
const std = @import("std");
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const assert = std.debug.assert;
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const abi = std.Build.Fuzz.abi;
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const gpa = std.heap.wasm_allocator;
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const log = std.log;
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const Coverage = std.debug.Coverage;
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const Walk = @import("Walk");
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const Decl = Walk.Decl;
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const html_render = @import("html_render");
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const js = struct {
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extern "js" fn log(ptr: [*]const u8, len: usize) void;
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extern "js" fn panic(ptr: [*]const u8, len: usize) noreturn;
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extern "js" fn emitSourceIndexChange() void;
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extern "js" fn emitCoverageUpdate() void;
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};
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pub const std_options: std.Options = .{
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.logFn = logFn,
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};
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pub fn panic(msg: []const u8, st: ?*std.builtin.StackTrace, addr: ?usize) noreturn {
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_ = st;
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_ = addr;
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log.err("panic: {s}", .{msg});
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@trap();
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}
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fn logFn(
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comptime message_level: log.Level,
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comptime scope: @TypeOf(.enum_literal),
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comptime format: []const u8,
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args: anytype,
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) void {
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const level_txt = comptime message_level.asText();
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const prefix2 = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): ";
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var buf: [500]u8 = undefined;
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const line = std.fmt.bufPrint(&buf, level_txt ++ prefix2 ++ format, args) catch l: {
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buf[buf.len - 3 ..][0..3].* = "...".*;
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break :l &buf;
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};
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js.log(line.ptr, line.len);
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}
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export fn alloc(n: usize) [*]u8 {
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const slice = gpa.alloc(u8, n) catch @panic("OOM");
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return slice.ptr;
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}
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var message_buffer: std.ArrayListAlignedUnmanaged(u8, @alignOf(u64)) = .{};
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/// Resizes the message buffer to be the correct length; returns the pointer to
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/// the query string.
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export fn message_begin(len: usize) [*]u8 {
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message_buffer.resize(gpa, len) catch @panic("OOM");
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return message_buffer.items.ptr;
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}
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export fn message_end() void {
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const msg_bytes = message_buffer.items;
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const tag: abi.ToClientTag = @enumFromInt(msg_bytes[0]);
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switch (tag) {
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.source_index => return sourceIndexMessage(msg_bytes) catch @panic("OOM"),
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.coverage_update => return coverageUpdateMessage(msg_bytes) catch @panic("OOM"),
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_ => unreachable,
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}
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}
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export fn unpack(tar_ptr: [*]u8, tar_len: usize) void {
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const tar_bytes = tar_ptr[0..tar_len];
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log.debug("received {d} bytes of tar file", .{tar_bytes.len});
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unpackInner(tar_bytes) catch |err| {
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fatal("unable to unpack tar: {s}", .{@errorName(err)});
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};
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}
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/// Set by `set_input_string`.
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var input_string: std.ArrayListUnmanaged(u8) = .{};
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var string_result: std.ArrayListUnmanaged(u8) = .{};
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export fn set_input_string(len: usize) [*]u8 {
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input_string.resize(gpa, len) catch @panic("OOM");
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return input_string.items.ptr;
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}
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/// Looks up the root struct decl corresponding to a file by path.
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/// Uses `input_string`.
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export fn find_file_root() Decl.Index {
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const file: Walk.File.Index = @enumFromInt(Walk.files.getIndex(input_string.items) orelse return .none);
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return file.findRootDecl();
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}
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export fn decl_source_html(decl_index: Decl.Index) String {
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const decl = decl_index.get();
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string_result.clearRetainingCapacity();
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html_render.fileSourceHtml(decl.file, &string_result, decl.ast_node, .{}) catch |err| {
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fatal("unable to render source: {s}", .{@errorName(err)});
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};
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return String.init(string_result.items);
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}
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export fn lowestStack() String {
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const header: *abi.CoverageUpdateHeader = @ptrCast(recent_coverage_update.items[0..@sizeOf(abi.CoverageUpdateHeader)]);
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string_result.clearRetainingCapacity();
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string_result.writer(gpa).print("0x{d}", .{header.lowest_stack}) catch @panic("OOM");
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return String.init(string_result.items);
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}
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export fn totalRuns() u64 {
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const header: *abi.CoverageUpdateHeader = @ptrCast(recent_coverage_update.items[0..@sizeOf(abi.CoverageUpdateHeader)]);
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return header.n_runs;
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}
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export fn uniqueRuns() u64 {
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const header: *abi.CoverageUpdateHeader = @ptrCast(recent_coverage_update.items[0..@sizeOf(abi.CoverageUpdateHeader)]);
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return header.unique_runs;
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}
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const String = Slice(u8);
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fn Slice(T: type) type {
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return packed struct(u64) {
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ptr: u32,
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len: u32,
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fn init(s: []const T) @This() {
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return .{
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.ptr = @intFromPtr(s.ptr),
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.len = s.len,
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};
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}
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};
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}
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fn unpackInner(tar_bytes: []u8) !void {
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var fbs = std.io.fixedBufferStream(tar_bytes);
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var file_name_buffer: [1024]u8 = undefined;
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var link_name_buffer: [1024]u8 = undefined;
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var it = std.tar.iterator(fbs.reader(), .{
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.file_name_buffer = &file_name_buffer,
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.link_name_buffer = &link_name_buffer,
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});
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while (try it.next()) |tar_file| {
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switch (tar_file.kind) {
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.file => {
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if (tar_file.size == 0 and tar_file.name.len == 0) break;
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if (std.mem.endsWith(u8, tar_file.name, ".zig")) {
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log.debug("found file: '{s}'", .{tar_file.name});
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const file_name = try gpa.dupe(u8, tar_file.name);
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if (std.mem.indexOfScalar(u8, file_name, '/')) |pkg_name_end| {
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const pkg_name = file_name[0..pkg_name_end];
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const gop = try Walk.modules.getOrPut(gpa, pkg_name);
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const file: Walk.File.Index = @enumFromInt(Walk.files.entries.len);
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if (!gop.found_existing or
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std.mem.eql(u8, file_name[pkg_name_end..], "/root.zig") or
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std.mem.eql(u8, file_name[pkg_name_end + 1 .. file_name.len - ".zig".len], pkg_name))
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{
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gop.value_ptr.* = file;
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}
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const file_bytes = tar_bytes[fbs.pos..][0..@intCast(tar_file.size)];
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assert(file == try Walk.add_file(file_name, file_bytes));
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}
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} else {
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log.warn("skipping: '{s}' - the tar creation should have done that", .{tar_file.name});
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}
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},
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else => continue,
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}
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}
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}
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fn fatal(comptime format: []const u8, args: anytype) noreturn {
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var buf: [500]u8 = undefined;
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const line = std.fmt.bufPrint(&buf, format, args) catch l: {
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buf[buf.len - 3 ..][0..3].* = "...".*;
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break :l &buf;
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};
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js.panic(line.ptr, line.len);
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}
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fn sourceIndexMessage(msg_bytes: []u8) error{OutOfMemory}!void {
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const Header = abi.SourceIndexHeader;
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const header: Header = @bitCast(msg_bytes[0..@sizeOf(Header)].*);
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const directories_start = @sizeOf(Header);
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const directories_end = directories_start + header.directories_len * @sizeOf(Coverage.String);
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const files_start = directories_end;
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const files_end = files_start + header.files_len * @sizeOf(Coverage.File);
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const source_locations_start = files_end;
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const source_locations_end = source_locations_start + header.source_locations_len * @sizeOf(Coverage.SourceLocation);
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const string_bytes = msg_bytes[source_locations_end..][0..header.string_bytes_len];
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const directories: []const Coverage.String = @alignCast(std.mem.bytesAsSlice(Coverage.String, msg_bytes[directories_start..directories_end]));
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const files: []const Coverage.File = @alignCast(std.mem.bytesAsSlice(Coverage.File, msg_bytes[files_start..files_end]));
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const source_locations: []const Coverage.SourceLocation = @alignCast(std.mem.bytesAsSlice(Coverage.SourceLocation, msg_bytes[source_locations_start..source_locations_end]));
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try updateCoverage(directories, files, source_locations, string_bytes);
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js.emitSourceIndexChange();
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}
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fn coverageUpdateMessage(msg_bytes: []u8) error{OutOfMemory}!void {
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recent_coverage_update.clearRetainingCapacity();
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recent_coverage_update.appendSlice(gpa, msg_bytes) catch @panic("OOM");
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js.emitCoverageUpdate();
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}
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var coverage = Coverage.init;
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var coverage_source_locations: std.ArrayListUnmanaged(Coverage.SourceLocation) = .{};
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/// Contains the most recent coverage update message, unmodified.
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var recent_coverage_update: std.ArrayListUnmanaged(u8) = .{};
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fn updateCoverage(
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directories: []const Coverage.String,
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files: []const Coverage.File,
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source_locations: []const Coverage.SourceLocation,
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string_bytes: []const u8,
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) !void {
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coverage.directories.clearRetainingCapacity();
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coverage.files.clearRetainingCapacity();
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coverage.string_bytes.clearRetainingCapacity();
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coverage_source_locations.clearRetainingCapacity();
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try coverage_source_locations.appendSlice(gpa, source_locations);
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try coverage.string_bytes.appendSlice(gpa, string_bytes);
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try coverage.files.entries.resize(gpa, files.len);
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@memcpy(coverage.files.entries.items(.key), files);
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try coverage.files.reIndexContext(gpa, .{ .string_bytes = coverage.string_bytes.items });
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try coverage.directories.entries.resize(gpa, directories.len);
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@memcpy(coverage.directories.entries.items(.key), directories);
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try coverage.directories.reIndexContext(gpa, .{ .string_bytes = coverage.string_bytes.items });
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}
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