Improved function entry hook coverage

src/arm/code-stubs-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3163 matching lines @@
 
 
 void CEntryStub::Generate(MacroAssembler* masm) {
   // Called from JavaScript; parameters are on stack as if calling JS function
   // r0: number of arguments including receiver
   // r1: pointer to builtin function
   // fp: frame pointer  (restored after C call)
   // sp: stack pointer  (restored as callee's sp after C call)
   // cp: current context  (C callee-saved)
 
+  ProfileEntryHookStub::MaybeCallEntryHook(masm);
+
   // Result returned in r0 or r0+r1 by default.
 
   // NOTE: Invocations of builtins may return failure objects
   // instead of a proper result. The builtin entry handles
   // this by performing a garbage collection and retrying the
   // builtin once.
 
   // Compute the argv pointer in a callee-saved register.
   __ add(r6, sp, Operand(r0, LSL, kPointerSizeLog2));
   __ sub(r6, r6, Operand(kPointerSize));
@@ skipping 70 matching lines @@
 
 void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   // r0: code entry
   // r1: function
   // r2: receiver
   // r3: argc
   // [sp+0]: argv
 
   Label invoke, handler_entry, exit;
 
+  ProfileEntryHookStub::MaybeCallEntryHook(masm);
+
   // Called from C, so do not pop argc and args on exit (preserve sp)
   // No need to save register-passed args
   // Save callee-saved registers (incl. cp and fp), sp, and lr
   __ stm(db_w, sp, kCalleeSaved | lr.bit());
 
   // Save callee-saved vfp registers.
   __ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
   // Set up the reserved register for 0.0.
   __ vmov(kDoubleRegZero, 0.0);
   __ VFPEnsureFPSCRState(r4);
@@ skipping 3780 matching lines @@
     __ add(r1, r1, Operand(1));
   }
   masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
   __ mov(r1, Operand(r1, LSL, kPointerSizeLog2));
   __ add(sp, sp, r1);
   __ Ret();
 }
 
 
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
-  if (entry_hook_ != NULL) {
+  if (masm->isolate()->function_entry_hook() != NULL) {
     PredictableCodeSizeScope predictable(masm, 4 * Assembler::kInstrSize);
+    AllowStubCallsScope allow_stub_calls(masm, true);
     ProfileEntryHookStub stub;
     __ push(lr);
     __ CallStub(&stub);
     __ pop(lr);
   }
 }
 
 
 void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
   // The entry hook is a "push lr" instruction, followed by a call.
   const int32_t kReturnAddressDistanceFromFunctionStart =
       3 * Assembler::kInstrSize;
 
-  // Save live volatile registers.
-  __ Push(lr, r5, r1);
-  const int32_t kNumSavedRegs = 3;
+  // This should contain all kCallerSaved registers.
+  const RegList kSavedRegs =
+      1 <<  0 |  // r0
+      1 <<  1 |  // r1
+      1 <<  2 |  // r2
+      1 <<  3 |  // r3
+      1 <<  5 |  // r5
+      1 <<  9;   // r9
+  // We also save lr, so the count here is one higher than the mask indicates.
+  const int32_t kNumSavedRegs = 7;
+
+  ASSERT((kCallerSaved & kSavedRegs) == kCallerSaved);
+
+  // Save all caller-save registers as this may be called from anywhere.
+  __ stm(db_w, sp, kSavedRegs | lr.bit());
 
   // Compute the function's address for the first argument.
   __ sub(r0, lr, Operand(kReturnAddressDistanceFromFunctionStart));
 
   // The caller's return address is above the saved temporaries.
   // Grab that for the second argument to the hook.
   __ add(r1, sp, Operand(kNumSavedRegs * kPointerSize));
 
   // Align the stack if necessary.
   int frame_alignment = masm->ActivationFrameAlignment();
   if (frame_alignment > kPointerSize) {
     __ mov(r5, sp);
     ASSERT(IsPowerOf2(frame_alignment));
     __ and_(sp, sp, Operand(-frame_alignment));
   }
 
 #if defined(V8_HOST_ARCH_ARM)
-  __ mov(ip, Operand(reinterpret_cast<int32_t>(&entry_hook_)));
-  __ ldr(ip, MemOperand(ip));
+  int32_t entry_hook =
+      reinterpret_cast<int32_t>(masm->isolate()->function_entry_hook());
+  __ mov(ip, Operand(entry_hook));
 #else
   // Under the simulator we need to indirect the entry hook through a
   // trampoline function at a known address.
-  Address trampoline_address = reinterpret_cast<Address>(
-      reinterpret_cast<intptr_t>(EntryHookTrampoline));
-  ApiFunction dispatcher(trampoline_address);
+  ApiFunction dispatcher(FUNCTION_ADDR(EntryHookTrampoline));
   __ mov(ip, Operand(ExternalReference(&dispatcher,
                                        ExternalReference::BUILTIN_CALL,
                                        masm->isolate())));
 #endif
   __ Call(ip);
 
   // Restore the stack pointer if needed.
   if (frame_alignment > kPointerSize) {
     __ mov(sp, r5);
   }
 
-  __ Pop(lr, r5, r1);
-  __ Ret();
+  // Also pop pc to get Ret(0).
+  __ ldm(ia_w, sp, kSavedRegs | pc.bit());
 }
 
 
 template<class T>
 static void CreateArrayDispatch(MacroAssembler* masm) {
   int last_index = GetSequenceIndexFromFastElementsKind(
       TERMINAL_FAST_ELEMENTS_KIND);
   for (int i = 0; i <= last_index; ++i) {
     Label next;
     ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
@@ skipping 261 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM