mirror of
https://github.com/ziglang/zig.git
synced 2024-11-15 16:45:27 +00:00
dec7e45f7c
* libfuzzer: track unique runs instead of deduplicated runs - easier for consumers to notice when to recheck the covered bits. * move common definitions to `std.Build.Fuzz.abi`. build runner sends all the information needed to fuzzer web interface client needed in order to display inline coverage information along with source code.
163 lines
5.6 KiB
Zig
163 lines
5.6 KiB
Zig
const builtin = @import("builtin");
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const std = @import("../std.zig");
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const Build = std.Build;
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const Step = std.Build.Step;
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const assert = std.debug.assert;
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const fatal = std.process.fatal;
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const Allocator = std.mem.Allocator;
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const log = std.log;
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const Fuzz = @This();
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const build_runner = @import("root");
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pub const WebServer = @import("Fuzz/WebServer.zig");
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pub const abi = @import("Fuzz/abi.zig");
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pub fn start(
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gpa: Allocator,
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arena: Allocator,
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global_cache_directory: Build.Cache.Directory,
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zig_lib_directory: Build.Cache.Directory,
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zig_exe_path: []const u8,
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thread_pool: *std.Thread.Pool,
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all_steps: []const *Step,
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ttyconf: std.io.tty.Config,
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listen_address: std.net.Address,
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prog_node: std.Progress.Node,
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) Allocator.Error!void {
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const fuzz_run_steps = block: {
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const rebuild_node = prog_node.start("Rebuilding Unit Tests", 0);
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defer rebuild_node.end();
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var wait_group: std.Thread.WaitGroup = .{};
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defer wait_group.wait();
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var fuzz_run_steps: std.ArrayListUnmanaged(*Step.Run) = .{};
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defer fuzz_run_steps.deinit(gpa);
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for (all_steps) |step| {
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const run = step.cast(Step.Run) orelse continue;
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if (run.fuzz_tests.items.len > 0 and run.producer != null) {
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thread_pool.spawnWg(&wait_group, rebuildTestsWorkerRun, .{ run, ttyconf, rebuild_node });
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try fuzz_run_steps.append(gpa, run);
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}
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}
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if (fuzz_run_steps.items.len == 0) fatal("no fuzz tests found", .{});
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rebuild_node.setEstimatedTotalItems(fuzz_run_steps.items.len);
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break :block try arena.dupe(*Step.Run, fuzz_run_steps.items);
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};
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// Detect failure.
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for (fuzz_run_steps) |run| {
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assert(run.fuzz_tests.items.len > 0);
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if (run.rebuilt_executable == null)
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fatal("one or more unit tests failed to be rebuilt in fuzz mode", .{});
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}
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var web_server: WebServer = .{
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.gpa = gpa,
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.global_cache_directory = global_cache_directory,
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.zig_lib_directory = zig_lib_directory,
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.zig_exe_path = zig_exe_path,
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.listen_address = listen_address,
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.fuzz_run_steps = fuzz_run_steps,
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.msg_queue = .{},
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.mutex = .{},
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.condition = .{},
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.coverage_files = .{},
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.coverage_mutex = .{},
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.coverage_condition = .{},
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};
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// For accepting HTTP connections.
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const web_server_thread = std.Thread.spawn(.{}, WebServer.run, .{&web_server}) catch |err| {
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fatal("unable to spawn web server thread: {s}", .{@errorName(err)});
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};
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defer web_server_thread.join();
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// For polling messages and sending updates to subscribers.
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const coverage_thread = std.Thread.spawn(.{}, WebServer.coverageRun, .{&web_server}) catch |err| {
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fatal("unable to spawn coverage thread: {s}", .{@errorName(err)});
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};
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defer coverage_thread.join();
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{
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const fuzz_node = prog_node.start("Fuzzing", fuzz_run_steps.len);
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defer fuzz_node.end();
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var wait_group: std.Thread.WaitGroup = .{};
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defer wait_group.wait();
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for (fuzz_run_steps) |run| {
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for (run.fuzz_tests.items) |unit_test_index| {
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assert(run.rebuilt_executable != null);
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thread_pool.spawnWg(&wait_group, fuzzWorkerRun, .{
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run, &web_server, unit_test_index, ttyconf, fuzz_node,
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});
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}
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}
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}
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log.err("all fuzz workers crashed", .{});
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}
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fn rebuildTestsWorkerRun(run: *Step.Run, ttyconf: std.io.tty.Config, parent_prog_node: std.Progress.Node) void {
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const gpa = run.step.owner.allocator;
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const stderr = std.io.getStdErr();
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const compile = run.producer.?;
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const prog_node = parent_prog_node.start(compile.step.name, 0);
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defer prog_node.end();
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const result = compile.rebuildInFuzzMode(prog_node);
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const show_compile_errors = compile.step.result_error_bundle.errorMessageCount() > 0;
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const show_error_msgs = compile.step.result_error_msgs.items.len > 0;
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const show_stderr = compile.step.result_stderr.len > 0;
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if (show_error_msgs or show_compile_errors or show_stderr) {
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std.debug.lockStdErr();
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defer std.debug.unlockStdErr();
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build_runner.printErrorMessages(gpa, &compile.step, ttyconf, stderr, false) catch {};
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}
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const rebuilt_bin_path = result catch |err| switch (err) {
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error.MakeFailed => return,
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else => {
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log.err("step '{s}': failed to rebuild in fuzz mode: {s}", .{
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compile.step.name, @errorName(err),
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});
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return;
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},
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};
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run.rebuilt_executable = rebuilt_bin_path;
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}
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fn fuzzWorkerRun(
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run: *Step.Run,
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web_server: *WebServer,
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unit_test_index: u32,
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ttyconf: std.io.tty.Config,
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parent_prog_node: std.Progress.Node,
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) void {
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const gpa = run.step.owner.allocator;
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const test_name = run.cached_test_metadata.?.testName(unit_test_index);
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const prog_node = parent_prog_node.start(test_name, 0);
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defer prog_node.end();
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run.rerunInFuzzMode(web_server, unit_test_index, prog_node) catch |err| switch (err) {
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error.MakeFailed => {
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const stderr = std.io.getStdErr();
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std.debug.lockStdErr();
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defer std.debug.unlockStdErr();
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build_runner.printErrorMessages(gpa, &run.step, ttyconf, stderr, false) catch {};
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return;
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},
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else => {
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log.err("step '{s}': failed to rerun '{s}' in fuzz mode: {s}", .{
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run.step.name, test_name, @errorName(err),
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});
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return;
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},
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};
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}
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