pcbjam/scripts/common/shims/dyncall-binding.js.tmpl
Viktor Vaczi a4ad69412e fix(wasm): bind dynCall_* to real DYNCALLS=1 exports; refactor shim into files
The shim bound bare dynCall_* names to JS getWasmTableEntry() calls, bypassing
the asyncify-instrumented dynCall_* wasm trampolines that -sDYNCALLS=1 provides.
That broke Asyncify unwind/rewind through indirect calls -> "indirect call
signature mismatch" (caught every frame in Firefox; fatal renderer crash in
Chrome). Bind the bare names to wasmExports["dynCall_<sig>"] instead.

Result: the PCBnew "select draw lines" e2e is green in Firefox (tool selects and
draws, zero page errors). Dropped the fiber-stabilization block, the shipped
diagnostic block, and the exportCallStack JS hack (all compensated for the wrong
binding); shim shrank 521 -> ~250 lines.

- scripts/common/inject-dyncall-shims.sh: orchestrator only; injected JS extracted
  to scripts/common/shims/
- scripts/common/shims/dyncall-binding.js.tmpl: per-signature binding template
- scripts/common/shims/handlesleep.js: nested-Asyncify handleSleep fix (#9153)
- scripts/common/shims/diagnostics.js: logging-only, opt-in via SHIM_DIAGNOSTICS=1
- tests/package.json: add test:kicad:firefox / test:kicad:chrome scripts

Known issue (tracked separately): Chrome still renderer-crashes on the first
coroutine resume. Asyncify.doRewind replays the deep main-context call stack and
exceeds V8's execution-stack limit (Firefox tolerates the same wasm). Proper fix
is JSPI.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-25 15:07:10 +02:00

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Go Template

// Template for one dynCall_<sig> binding. Placeholders substituted per signature
// by inject-dyncall-shims.sh: @SIG@ = signature, @ARGS@ = "index, a0, a1, ...",
// @CALLARGS@ = "a0, a1, ..." (the args without the function-pointer index).
//
// Binds the bare name to the REAL asyncify-instrumented wasm export
// (wasmExports["dynCall_<sig>"], present because the build links -sDYNCALLS=1).
// Falls back to getWasmTableEntry only if no such export exists.
function dynCall_@SIG@(@ARGS@) {
var f = (typeof wasmExports !== 'undefined') && wasmExports["dynCall_@SIG@"];
if (f) return f(@ARGS@);
return getWasmTableEntry(index)(@CALLARGS@);
}