ffi: reuse libffi call plans - #64958

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ffi: reuse libffi call plans#64958
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Fixes: #64562
Refs: libffi/libffi@3cc6beb

libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.

Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.

Before (ffi_call):

signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5

After (ffi_call_plan_invoke, plan reused):

signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1

@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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@nodejs-github-botnodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. needs-ci PRs that need a full CI run. labels Aug 2, 2026
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Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.

Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️

... and 55 files with indirect coverage changes

🚀 New features to boost your workflow:
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
@umuoy1
umuoy1force-pushed the ffi-reuse-call-plans branch from 6d678be to 249d729CompareAugust 3, 2026 09:51
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mcollina requested review from ShogunPanda and trivikr and removed request for ShogunPandaAugust 3, 2026 10:31
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lgtm

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aduh95 pushed a commit that referenced this pull request Aug 13, 2026
@umuoy1@aduh95
ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@github-actionsgithub-actionsBot mentioned this pull request Aug 25, 2026
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libffi reusable call plans

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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})();
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var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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ffi: reuse libffi call plans - #64958
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nodejs-github-bot merged 2 commits into
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umuoy1:ffi-reuse-call-plans
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Merged
ffi: reuse libffi call plans#64958
nodejs-github-bot merged 2 commits into
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umuoy1:ffi-reuse-call-plans
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
@umuoy1
umuoy1force-pushed
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6d678be to
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and removed request for
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lgtm
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Landed in 31cde9f
aduh95 pushed a commit
that referenced
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Aug 13, 2026
@umuoy1@aduh95
ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@github-actionsgithub-actionsBot
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, 'i');
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injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
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ffi: reuse libffi call plans - #64958
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umuoy1:ffi-reuse-call-plans
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Merged
ffi: reuse libffi call plans#64958
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
@umuoy1
umuoy1force-pushed
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Landed in 31cde9f
aduh95 pushed a commit
that referenced
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Aug 13, 2026
@umuoy1@aduh95
ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@github-actionsgithub-actionsBot
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Aug 25, 2026
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libffi reusable call plans


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if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
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ffi: reuse libffi call plans - #64958
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
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libffi reusable call plans


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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ffi: reuse libffi call plans - #64958
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umuoy1:ffi-reuse-call-plans
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ffi: reuse libffi call plans#64958
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
@umuoy1
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Landed in 31cde9f
aduh95 pushed a commit
that referenced
this pull request
Aug 13, 2026
@umuoy1@aduh95
ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
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libffi reusable call plans


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
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ffi: reuse libffi call plans - #64958
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nodejs:mainfrom 
umuoy1:ffi-reuse-call-plans
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Merged
ffi: reuse libffi call plans#64958
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
@umuoy1
umuoy1force-pushed
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ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
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, 'i');
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})();
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ffi: reuse libffi call plans - #64958
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Landed in 31cde9f
aduh95 pushed a commit
that referenced
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Aug 13, 2026
@umuoy1@aduh95
ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Aug 25, 2026
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libffi reusable call plans


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@umuoy1@nodejs-github-bot@mcollina@ShogunPanda@trivikr@gurgunday

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
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ffi: reuse libffi call plans - #64958
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Fixes: #64562

Refs: libffi/libffi@3cc6beb
libffi 3.7 introduced reusable call plans that precompute argument placement. Node.js FFI functions have fixed signatures, so this change creates a plan during function preparation and reuses it for generic and SharedBuffer calls on x86-64 System V.
Other platforms, older libffi versions, and allocation failures continue to use ffi_call(). An invocation benchmark is included: it measures the call path for signatures that bypass the V8 Fast API and reach FFIFunction::Invoke(), covering a register-only and a stack-spilled call plan.
Before (ffi_call):
signaturens/call
call_int_callback — (function, i32) → i3229.2
sum_8_i32 — (i32 × 8) → i3273.5
After (ffi_call_plan_invoke, plan reused):
signaturens/call
call_int_callback — (function, i32) → i3210.5
sum_8_i32 — (i32 × 8) → i3227.1
@umuoy1
ffi: reuse libffi call plans
f4d2a52
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
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Codecov Report
❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

✅ Project coverage is 90.28%. Comparing base (276fe2b) to head (249d729).
⚠️ Report is 32 commits behind head on main.
Files with missing linesPatch %Lines
src/ffi/fast.cc91.66%0 Missing and 1 partial ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #64958 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01% 
==========================================
Files 760 762 +2 Lines 247076 247536 +460 Branches 46594 46680 +86 ==========================================
+ Hits 223081 223484 +403 - Misses 15458 15495 +37 - Partials 8537 8557 +20 
Files with missing linesCoverage Δ
src/node_ffi.cc70.71% <100.00%> (+0.07%)⬆️
src/node_ffi.h72.22% <100.00%> (+10.68%)⬆️
src/ffi/fast.cc69.75% <91.66%> (+1.99%)⬆️
... and 55 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
@umuoy1
benchmark: add FFI invocation benchmark
249d729
Measure the call path for signatures that bypass the V8 Fast API and
reach FFIFunction::Invoke(), covering a register-only and a
stack-spilled libffi call plan on x86-64 System V. The per-call delta
is the decision-relevant metric for reusable call plans: plan
allocation is a one-time cost that amortizes within a few calls.
Signed-off-by: umuoy1 <burningdian@gmail.com>
@umuoy1
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and removed request for
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Landed in 31cde9f
aduh95 pushed a commit
that referenced
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Aug 13, 2026
@umuoy1@aduh95
ffi: reuse libffi call plans
5cac7c2
Precompute a libffi call plan for each fixed signature on x86-64
System V and reuse it from the generic and SharedBuffer invokers. This
avoids repeating argument-placement work for every call.
Continue to use ffi_call() with libffi older than 3.7, on other ABIs,
and when plan allocation fails.
Signed-off-by: umuoy1 <burningdian@gmail.com>
PR-URL: #64958Fixes: #64562
Refs: libffi/libffi@3cc6beb
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
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