Merge pull request #25342 from ziglang/fuzz-limit

fuzzing: implement limited fuzzing

1 files changed, 14 insertions, 2 deletions

diff --git a/lib/std/Build/abi.zig b/lib/std/Build/abi.zig
index 2398a8ed8d..020e2ed032 100644
--- a/lib/std/Build/abi.zig
+++ b/lib/std/Build/abi.zig
@@ -140,10 +140,10 @@ pub const Rebuild = extern struct {
 pub const fuzz = struct {
     pub const TestOne = *const fn (Slice) callconv(.c) void;
     pub extern fn fuzzer_init(cache_dir_path: Slice) void;
-    pub extern fn fuzzer_coverage_id() u64;
+    pub extern fn fuzzer_coverage() Coverage;
     pub extern fn fuzzer_init_test(test_one: TestOne, unit_test_name: Slice) void;
     pub extern fn fuzzer_new_input(bytes: Slice) void;
-    pub extern fn fuzzer_main() void;
+    pub extern fn fuzzer_main(limit_kind: LimitKind, amount: u64) void;
 
     pub const Slice = extern struct {
         ptr: [*]const u8,
@@ -158,6 +158,8 @@ pub const fuzz = struct {
         }
     };
 
+    pub const LimitKind = enum(u8) { forever, iterations };
+
     /// libfuzzer uses this and its usize is the one that counts. To match the ABI,
     /// make the ints be the size of the target used with libfuzzer.
     ///
@@ -251,6 +253,16 @@ pub const fuzz = struct {
             return .{ .locs_len_raw = @bitCast(locs_len) };
         }
     };
+
+    /// Sent by lib/fuzzer to test_runner to obtain information about the
+    /// active memory mapped input file and cumulative stats about previous
+    /// fuzzing runs.
+    pub const Coverage = extern struct {
+        id: u64,
+        runs: u64,
+        unique: u64,
+        seen: u64,
+    };
 };
 
 /// ABI bits specifically relating to the time report interface.