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Issue #3049 - loongarch64: use explicit VM wrapper tail-call contracts

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Basilisk-Dev 2026-04-25 13:42:00 -04:00 • committed by wuggy
commit ff4332d605
1 changed files with 3 additions and 12 deletions
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15
js/src/jit/loongarch64/Trampoline-loongarch64.cpp
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@ -675,19 +675,10 @@ JitRuntime::generateVMWrapper(JSContext* cx, const VMFunction& f)
Register cxreg = a0;
regs.take(cxreg);
// LoongArch callers can arrive here in either style:
// - Non-tail calls keep the return address in |ra| and only push a descriptor.
// - Tail calls push a full CommonFrameLayout with the return address on the stack.
// Normalize both forms so the wrapper always sees a stack return address.
{
Label haveStackReturnAddress;
Register scratch = regs.getAny();
masm.loadPtr(Address(StackPointer, 0), scratch);
masm.rshiftPtr(Imm32(32), scratch);
masm.branch32(Assembler::NotEqual, scratch, Imm32(0), &haveStackReturnAddress);
// Non-tail calls keep the return address in |ra|, while tail-call sites
// have already materialized a CommonFrameLayout on the stack.
if (f.expectTailCall == NonTailCall)
masm.pushReturnAddress();
masm.bind(&haveStackReturnAddress);
}
// We're aligned to an exit frame, so link it up.
masm.enterExitFrame(&f);