go/src/encoding/json/encode.go, branch makepkg

encoding/json: realign struct encodeState, structFields, and field

2026-02-03T11:04:30Z

This reduce the struct encodeState size from 56 to 16 bytes (-42), struct structFields size from 40 to 24 bytes (-16), and struct field size from 136 to 128 bytes (-8). Benchmark memory profiling before and after, File: json.test Type: alloc_space Time: Jan 25, 2024 at 4:51am (WIB) Showing nodes accounting for -4.01GB, 4.66% of 85.95GB total Dropped 64 nodes (cum <= 0.43GB) flat flat% sum% cum cum% -4.25GB 4.94% 4.94% -4.01GB 4.67% encoding/json.Marshal 0.19GB 0.22% 4.73% 0.24GB 0.28% encoding/json.mapEncoder.encode 0.05GB 0.057% 4.67% 0.05GB 0.057% reflect.copyVal 0.04GB 0.049% 4.62% 0.04GB 0.049% bytes.growSlice -0.04GB 0.045% 4.66% -0.04GB 0.045% encoding/json.RawMessage.MarshalJSON 0 0% 4.66% 0.04GB 0.046% bytes.(*Buffer).WriteString 0 0% 4.66% 0.04GB 0.049% bytes.(*Buffer).grow 0 0% 4.66% -0.04GB 0.045% encoding/json.(*Encoder).Encode 0 0% 4.66% 0.20GB 0.23% encoding/json.(*encodeState).marshal 0 0% 4.66% 0.20GB 0.23% encoding/json.(*encodeState).reflectValue

encoding/json: optimize isValidNumber function

2026-02-03T11:04:30Z

Instead of re-slicing the string for checking the value, use single index variable. Benchmark result, name old time/op new time/op delta NumberIsValid-8 19.0ns ± 0% 14.5ns ± 1% -23.70% (p=0.008 n=5+5) name old alloc/op new alloc/op delta NumberIsValid-8 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta NumberIsValid-8 0.00 0.00 ~ (all equal) Change-Id: I4698c5db134998f83ff47fb3add6a04ba6ec3aa0

encoding/json: fix typo in package doc.

2026-01-24T02:08:03Z

Change-Id: Id5520757e4d73e56e533e4de4f5f303105c4339e Reviewed-on: https://go-review.googlesource.com/c/go/+/738180 Reviewed-by: Dmitri Shuralyov Auto-Submit: David Symonds Reviewed-by: Carlos Amedee Reviewed-by: David Symonds Reviewed-by: Ian Lance Taylor Reviewed-by: Joseph Tsai LUCI-TryBot-Result: Go LUCI

encoding/json: remove unneeded unsafe import

2026-01-22T22:29:44Z

Followon for CL 721160. Change-Id: I9c22c5e99c9084e24047c77d20717c5b46165cde Reviewed-on: https://go-review.googlesource.com/c/go/+/732220 Reviewed-by: Carlos Amedee Reviewed-by: Michael Pratt Reviewed-by: Sean Liao LUCI-TryBot-Result: Go LUCI

encoding/json: remove linknames

2025-11-20T22:04:37Z

The linknames have been removed in the latest commits: isValidNumber, typeFields: https://github.com/bytedance/sonic/commit/908af5dfaf7d509db1f2c2b1c43f4df728db80a6 unquoteBytes: https://github.com/bytedance/sonic/commit/8e9090a84be10962046197f1867d297d3e73020a For #67401 Change-Id: I30b057137932fcf267014ab5470c417298765249 Reviewed-on: https://go-review.googlesource.com/c/go/+/721160 LUCI-TryBot-Result: Go LUCI Reviewed-by: Joseph Tsai Reviewed-by: Junyang Shao Reviewed-by: Mark Freeman

encoding/json: use reflect.TypeAssert

2025-09-10T00:22:28Z

Updates #62121 Change-Id: Ic3c4fe84a5dacfd8270aba0d5dd59f83f0a9030f Reviewed-on: https://go-review.googlesource.com/c/go/+/701955 Reviewed-by: Mark Freeman Reviewed-by: Damien Neil LUCI-TryBot-Result: Go LUCI

encoding/json: add security section to doc

2025-06-27T20:38:47Z

Add a section to the package doc which details the security considerations of using encoding/json, in particular with respect to parser misalignment issues. Additionally, clarify previously ambiguous statement in the Unmarshal doc about how case is used when matching keys in objects, and add a note about how duplicate keys are handled. Fixes #14750 Change-Id: I66f9b845efd98c86a684d7333b3aa8a456564922 Reviewed-on: https://go-review.googlesource.com/c/go/+/684315 LUCI-TryBot-Result: Go LUCI Reviewed-by: Joseph Tsai Auto-Submit: Roland Shoemaker Reviewed-by: Damien Neil

encoding/json: avoid supurious synctest deadlock detection

2025-05-20T22:46:07Z

Use a sync.OnceValue rather than a sync.WaitGroup to coordinate access to encoderCache entries. The OnceValue better expresses the intent of the code (we want to initialize the cache entry only once). However, the motivation for this change is to avoid testing/synctest incorrectly reporting a deadlock when multiple bubbles call Marshal at the same time. Goroutines blocked on WaitGroup.Wait are "durably blocked", causing confusion when a goroutine in one bubble Waits for a goroutine in a different bubble. Goroutines blocked on OnceValue are not durably blocked, avoiding the problem. Fixes #73733 For #67434 Change-Id: I81cddda80af67cf5c280fd4327620bc37e7a6fe6 Reviewed-on: https://go-review.googlesource.com/c/go/+/673335 Auto-Submit: Damien Neil Reviewed-by: Michael Pratt LUCI-TryBot-Result: Go LUCI

encoding/json: add json/v2 with GOEXPERIMENT=jsonv2 guard

2025-04-18T15:24:07Z

This imports the proposed new v2 JSON API implemented in github.com/go-json-experiment/json as of commit d3c622f1b874954c355e60c8e6b6baa5f60d2fed. When GOEXPERIMENT=jsonv2 is set, the encoding/json/v2 and encoding/jsontext packages are visible, the encoding/json package is implemented in terms of encoding/json/v2, and the encoding/json package include various additional APIs. (See #71497 for details.) When GOEXPERIMENT=jsonv2 is not set, the new API is not present and the encoding/json package is unchanged. The experimental API is not bound by the Go compatibility promise and is expected to evolve as updates are made to the json/v2 proposal. The contents of encoding/json/internal/jsontest/testdata are compressed with zstd v1.5.7 with the -19 option. Fixes #71845 For #71497 Change-Id: Ib8c94e5f0586b6aaa22833190b41cf6ef59f4f01 Reviewed-on: https://go-review.googlesource.com/c/go/+/665796 Auto-Submit: Damien Neil LUCI-TryBot-Result: Go LUCI Reviewed-by: Michael Pratt Reviewed-by: Joseph Tsai Reviewed-by: Dmitri Shuralyov

encoding/json: use builtin min function in appendString

2025-02-25T19:49:13Z

To make code a bit simpler. Change-Id: I59fca1d5760e304abd53873ecf9ca8b2903e02e8 GitHub-Last-Rev: 1369df6da16121c342a4e678efe3e5b082485b74 GitHub-Pull-Request: golang/go#71873 Reviewed-on: https://go-review.googlesource.com/c/go/+/651355 Reviewed-by: Ian Lance Taylor Auto-Submit: Ian Lance Taylor LUCI-TryBot-Result: Go LUCI Reviewed-by: Michael Pratt