}
+// The entry hook is a "BumpSystemStackPointer" instruction (sub), followed by
+// a "Push lr" instruction, followed by a call.
+static const unsigned int kProfileEntryHookCallSize =
+ Assembler::kCallSizeWithRelocation + (2 * kInstructionSize);
+
+
void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
if (masm->isolate()->function_entry_hook() != NULL) {
- // TODO(all): This needs to be reliably consistent with
- // kReturnAddressDistanceFromFunctionStart in ::Generate.
- Assembler::BlockPoolsScope no_pools(masm);
ProfileEntryHookStub stub;
+ Assembler::BlockConstPoolScope no_const_pools(masm);
+ Label entry_hook_call_start;
+ __ Bind(&entry_hook_call_start);
__ Push(lr);
__ CallStub(&stub);
+ ASSERT(masm->SizeOfCodeGeneratedSince(&entry_hook_call_start) ==
+ kProfileEntryHookCallSize);
+
__ Pop(lr);
}
}
void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
MacroAssembler::NoUseRealAbortsScope no_use_real_aborts(masm);
- // The entry hook is a "BumpSystemStackPointer" instruction (sub), followed by
- // a "Push lr" instruction, followed by a call.
- static const int kReturnAddressDistanceFromFunctionStart =
- Assembler::kCallSizeWithRelocation + (2 * kInstructionSize);
// Save all kCallerSaved registers (including lr), since this can be called
// from anywhere.
const int kNumSavedRegs = kCallerSaved.Count();
// Compute the function's address as the first argument.
- __ Sub(x0, lr, kReturnAddressDistanceFromFunctionStart);
+ __ Sub(x0, lr, kProfileEntryHookCallSize);
#if V8_HOST_ARCH_ARM64
uintptr_t entry_hook =