perf: daily optimization audit for bridge/core#160
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- Optimized `bindSlice` with a fast-path for `[]byte` by bypassing element-by-element iteration and utilizing `ToArrayBuffer` with safe slice copying. - Optimized `bindMap` by replacing interface-boxing via `fmt.Sprint` with `v.MapRange()` and type-specific formatting via `strconv`. - Addressed a potential WaitGroup counter panic in `CreatePromise` via thread-safe `sync.Once`. Co-authored-by: repyh <63894915+repyh@users.noreply.github.com>
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📝 WalkthroughWalkthroughThis PR improves performance of Go-to-JavaScript value binding and hardens concurrency safety. Reflection binding optimizations use specialized fast paths for byte slices (array buffers) and maps (MapRange iteration with strconv-based key formatting). New benchmarks measure these improvements. EventLoop promise settlement is guarded against multiple invocations. ChangesPerformance and concurrency improvements
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Poem
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Actionable comments posted: 2
🧹 Nitpick comments (2)
bridge/core/reflection.go (1)
342-352: 💤 Low valueMinor simplification of the byte-slice copy.
The two branches collapse to a single
reflect.Copycall (works for both slices and addressable byte arrays, and avoids the kind check entirely):Proposed simplification
- if v.Type().Elem() == reflect.TypeOf(byte(0)) { - var buf []byte - if v.CanAddr() || v.Kind() == reflect.Slice { - b := v.Bytes() - buf = make([]byte, len(b)) - copy(buf, b) - } else { - buf = make([]byte, v.Len()) - reflect.Copy(reflect.ValueOf(buf), v) - } - return ToArrayBuffer(vm, buf), nil - } + if v.Type().Elem().Kind() == reflect.Uint8 { + buf := make([]byte, v.Len()) + reflect.Copy(reflect.ValueOf(buf), v) + return ToArrayBuffer(vm, buf), nil + }Using
Kind() == reflect.Uint8also matches defined byte-alias element types (e.g.,type Octet byte), which the current strict-equality check onreflect.TypeOf(byte(0))misses — minor, but probably desirable for the fast path.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@bridge/core/reflection.go` around lines 342 - 352, The byte-slice handling in the reflection path uses an exact type equality check and separate branches for addressable vs non-addressable values; replace this with a single fast-path that checks the element kind (v.Type().Elem().Kind() == reflect.Uint8) so byte aliases (e.g., type Octet byte) are handled, allocate a []byte of appropriate length and use reflect.Copy to copy into it (collapsing the v.CanAddr()/v.Kind()==reflect.Slice branches), then return ToArrayBuffer(vm, buf) as before; update the logic around the existing v.Type().Elem() == reflect.TypeOf(byte(0)) check and the code that constructs buf and calls ToArrayBuffer(vm, buf).bridge/core/reflection_bench_test.go (1)
16-19: 💤 Low valueConsider
b.ReportAllocs()to capture allocation deltas.The PR motivation is largely about cutting allocations (fast-path copy vs. per-element reflection,
MapRangevsMapKeys,strconvvsfmt.Sprint). Addingb.ReportAllocs()right afterb.ResetTimer()would make the allocs/op visible in the benchmark output, which is what reviewers will want to compare before/after.Proposed change (apply to all three benchmarks)
b.ResetTimer() + b.ReportAllocs() for i := 0; i < b.N; i++ { _, _ = bindSlice(vm, v, visited) }Also applies to: 31-34, 46-49
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@bridge/core/reflection_bench_test.go` around lines 16 - 19, Add b.ReportAllocs() immediately after b.ResetTimer() in the benchmarks in reflection_bench_test.go so allocation counts are recorded; specifically, update the benchmark(s) that call bindSlice(vm, v, visited) (and the other two similar benchmarks in the file) to call b.ReportAllocs() before entering the loop so allocs/op will appear in the benchmark output.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@bridge/core/reflection.go`:
- Around line 376-385: The fast-path switch in bindMap that converts map keys by
key.Kind() bypasses fmt.Stringer for named types; change the logic so that
before taking the numeric/string branches you check whether key.Type()
implements fmt.Stringer (use a package-level var stringerType =
reflect.TypeOf((*fmt.Stringer)(nil)).Elem() to avoid repeated lookups) and if so
fall through to the default branch that calls fmt.Sprint(key.Interface());
otherwise continue using the existing Kind-based strconv fast paths for raw
builtin kinds.
- Around line 340-353: bindSlice now special-cases byte element types and
returns ToArrayBuffer(vm, buf) (used for both reflect.Slice and reflect.Array
via bindValue), which changes the JS contract for []byte/[N]byte from an
indexable Array to an ArrayBuffer; either confirm this is intentional and add an
explicit note to CHANGELOG.md documenting the breaking change, or provide a
compatibility path: add a flag or API (e.g., a vm option or helper) that lets
callers opt into the previous behavior (returning a JS Array) and update
bindSlice to branch on that option when v.Type().Elem() ==
reflect.TypeOf(byte(0)), ensuring bindValue preserves the same behavior for
arrays; mention bindSlice, bindValue, ToArrayBuffer and CHANGELOG.md in your
changes so reviewers can find the logic and documentation to update.
---
Nitpick comments:
In `@bridge/core/reflection_bench_test.go`:
- Around line 16-19: Add b.ReportAllocs() immediately after b.ResetTimer() in
the benchmarks in reflection_bench_test.go so allocation counts are recorded;
specifically, update the benchmark(s) that call bindSlice(vm, v, visited) (and
the other two similar benchmarks in the file) to call b.ReportAllocs() before
entering the loop so allocs/op will appear in the benchmark output.
In `@bridge/core/reflection.go`:
- Around line 342-352: The byte-slice handling in the reflection path uses an
exact type equality check and separate branches for addressable vs
non-addressable values; replace this with a single fast-path that checks the
element kind (v.Type().Elem().Kind() == reflect.Uint8) so byte aliases (e.g.,
type Octet byte) are handled, allocate a []byte of appropriate length and use
reflect.Copy to copy into it (collapsing the v.CanAddr()/v.Kind()==reflect.Slice
branches), then return ToArrayBuffer(vm, buf) as before; update the logic around
the existing v.Type().Elem() == reflect.TypeOf(byte(0)) check and the code that
constructs buf and calls ToArrayBuffer(vm, buf).
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: 5587833d-e22c-482b-a920-b2234b1016a9
📒 Files selected for processing (3)
bridge/core/reflection.gobridge/core/reflection_bench_test.goeventloop/eventloop.go
| func bindSlice(vm *sobek.Runtime, v reflect.Value, visited map[uintptr]sobek.Value) (sobek.Value, error) { | ||
| // @optimized: Fast path for byte slices to avoid element-by-element conversion and GC pressure. | ||
| if v.Type().Elem() == reflect.TypeOf(byte(0)) { | ||
| var buf []byte | ||
| if v.CanAddr() || v.Kind() == reflect.Slice { | ||
| b := v.Bytes() | ||
| buf = make([]byte, len(b)) | ||
| copy(buf, b) | ||
| } else { | ||
| buf = make([]byte, v.Len()) | ||
| reflect.Copy(reflect.ValueOf(buf), v) | ||
| } | ||
| return ToArrayBuffer(vm, buf), nil | ||
| } |
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# Confirm ToArrayBuffer is defined in this package and inspect its signature/semantics.
rg -nP --type=go -C3 '\bfunc\s+ToArrayBuffer\s*\('
# Find any JS-side or Go-side tests that consume byte slices through BindStruct/bindValue.
rg -nP --type=go -C2 '\b(BindStruct|bindValue|bindSlice)\b' -g '!**/vendor/**'
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rg -n --hidden --no-ignore-vcs '\bArrayBuffer\b|\bUint8Array\b|\bbyteLength\b' -g'*.go' -g'*.js' -g'*.ts'
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rg -n --hidden --no-ignore-vcs '\bMapSharedBuffer\b|\bNewArrayBuffer\b|\bToArrayBuffer\b' -g'*.go'
# Search for byte-slice binding expectations in tests/benchmarks
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Confirm the breaking JS contract change for bound []byte/[N]byte
bindSlice now special-cases byte element types and returns ToArrayBuffer(vm, buf) (which wraps vm.NewArrayBuffer(data)), so JS receives an ArrayBuffer (with byteLength) rather than an indexable JS Array—callers must wrap it as new Uint8Array(arrayBuffer) to read bytes. Since bindValue routes both reflect.Slice and reflect.Array to bindSlice, this also impacts [N]byte.
No mention of this mapping exists in CHANGELOG.md, so it’s currently an undocumented breaking contract for any code expecting arr[i], .length, map, or for...of behavior. Please confirm this is intentional and either document it in the release notes or provide an opt-in / compatibility path.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@bridge/core/reflection.go` around lines 340 - 353, bindSlice now
special-cases byte element types and returns ToArrayBuffer(vm, buf) (used for
both reflect.Slice and reflect.Array via bindValue), which changes the JS
contract for []byte/[N]byte from an indexable Array to an ArrayBuffer; either
confirm this is intentional and add an explicit note to CHANGELOG.md documenting
the breaking change, or provide a compatibility path: add a flag or API (e.g., a
vm option or helper) that lets callers opt into the previous behavior (returning
a JS Array) and update bindSlice to branch on that option when v.Type().Elem()
== reflect.TypeOf(byte(0)), ensuring bindValue preserves the same behavior for
arrays; mention bindSlice, bindValue, ToArrayBuffer and CHANGELOG.md in your
changes so reviewers can find the logic and documentation to update.
| switch key.Kind() { | ||
| case reflect.String: | ||
| keyStr = key.String() | ||
| } else { | ||
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: | ||
| keyStr = strconv.FormatInt(key.Int(), 10) | ||
| case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: | ||
| keyStr = strconv.FormatUint(key.Uint(), 10) | ||
| default: | ||
| keyStr = fmt.Sprint(key.Interface()) | ||
| } |
There was a problem hiding this comment.
Numeric/string key fast paths bypass fmt.Stringer on named key types.
The previous code used fmt.Sprint(key.Interface()), which honors a String() string method on the key type. The new switch keys on Kind(), so for a defined type whose underlying kind is string, int* or uint* and which implements fmt.Stringer, the resulting JS property name changes (raw underlying value instead of the Stringer output). Example:
type Color int
func (c Color) String() string { return [...]string{"red","green","blue"}[c] }
m := map[Color]int{1: 42}Before: JS sees { "green": 42 }. After: JS sees { "1": 42 }.
If preserving the prior behavior matters, fall through to the default arm when the key type implements fmt.Stringer:
Proposed fix
+ stringerType := reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
for iter.Next() {
key := iter.Key()
var keyStr string
- switch key.Kind() {
- case reflect.String:
- keyStr = key.String()
- case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
- keyStr = strconv.FormatInt(key.Int(), 10)
- case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
- keyStr = strconv.FormatUint(key.Uint(), 10)
- default:
- keyStr = fmt.Sprint(key.Interface())
- }
+ if key.Type().Implements(stringerType) {
+ keyStr = key.Interface().(fmt.Stringer).String()
+ } else {
+ switch key.Kind() {
+ case reflect.String:
+ keyStr = key.String()
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ keyStr = strconv.FormatInt(key.Int(), 10)
+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+ keyStr = strconv.FormatUint(key.Uint(), 10)
+ default:
+ keyStr = fmt.Sprint(key.Interface())
+ }
+ }(Hoist stringerType out of bindMap into a package-level var to keep the lookup off the hot path.)
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@bridge/core/reflection.go` around lines 376 - 385, The fast-path switch in
bindMap that converts map keys by key.Kind() bypasses fmt.Stringer for named
types; change the logic so that before taking the numeric/string branches you
check whether key.Type() implements fmt.Stringer (use a package-level var
stringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem() to avoid repeated
lookups) and if so fall through to the default branch that calls
fmt.Sprint(key.Interface()); otherwise continue using the existing Kind-based
strconv fast paths for raw builtin kinds.
1 participant
Daily Incremental Optimization Audit:
bridge/coreChange Impact Analysis:
bridge/corethat introduced optimization debt.eventloop.goorreflection.gowere reverted.Rotational Audit Execution:
bindSliceFast Path:v.Type().Elem() == reflect.TypeOf(byte(0)).[]byte, forces a deep copy, and returns anArrayBuffer.bindMapKey Iteration:v.MapKeys()withv.MapRange()to completely bypass allocating a slice containing all map keys.strconv.FormatIntandstrconv.FormatUintinstead of the heavily allocatingfmt.Sprint(key.Interface()).BenchmarkBindMapIntoperation time fell from ~627k ns/op to ~497k ns/op.WaitGroupProtection:eventloop/eventloop.go,CreatePromiseincrements the eventloopsync.WaitGroupto artificially keep the loop alive until settled.resolveorrejectmultiple times from a JS callback would previously causeel.wg.Done()to be executed multiple times, triggering a panic:sync: negative WaitGroup counter.sync.Onceinside the closure, perfectly mimicking the ECMAScript Promise spec where states are locked once settled.Health Score:
bridge/core: 9/10 (Optimized well, cache locality is sound, but dynamic reflection naturally retains some overhead ceiling).Testing:
make testfor integration pipelines.PR created automatically by Jules for task 16549839862507545434 started by @repyh
Summary by CodeRabbit
Bug Fixes
Performance