Reland "Remove Failure::OutOfMemory propagation and V8::IgnoreOutOfMemoryException."

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index f06f6bc6e96e696cd75d740e80ef6f84bcdea698..61b395fb92db2b683960bd91622fec40590ee27f 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -1405,18 +1405,6 @@ void CodeStub::GenerateFPStubs(Isolate* isolate) {
 }
 
 
-static void JumpIfOOM(MacroAssembler* masm,
-                      Register value,
-                      Register scratch,
-                      Label* oom_label) {
-  STATIC_ASSERT(Failure::OUT_OF_MEMORY_EXCEPTION == 3);
-  STATIC_ASSERT(kFailureTag == 3);
-  __ And(scratch, value, 0xf);
-  __ Cmp(scratch, 0xf);
-  __ B(eq, oom_label);
-}
-
-
 bool CEntryStub::NeedsImmovableCode() {
   // CEntryStub stores the return address on the stack before calling into
   // C++ code. In some cases, the VM accesses this address, but it is not used
@@ -1441,7 +1429,6 @@ void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
 void CEntryStub::GenerateCore(MacroAssembler* masm,
                               Label* throw_normal,
                               Label* throw_termination,
-                              Label* throw_out_of_memory,
                               bool do_gc,
                               bool always_allocate) {
   // x0  : Result parameter for PerformGC, if do_gc is true.
@@ -1589,10 +1576,6 @@ void CEntryStub::GenerateCore(MacroAssembler* masm,
   __ Tst(result, kFailureTypeTagMask << kFailureTagSize);
   __ B(eq, &retry);   // RETRY_AFTER_GC
 
-  // Special handling of out-of-memory exceptions: Pass the failure result,
-  // rather than the exception descriptor.
-  JumpIfOOM(masm, result, x10, throw_out_of_memory);
-
   // Retrieve the pending exception.
   const Register& exception = result;
   const Register& exception_address = x11;
@@ -1601,9 +1584,6 @@ void CEntryStub::GenerateCore(MacroAssembler* masm,
                                    isolate)));
   __ Ldr(exception, MemOperand(exception_address));
 
-  // See if we just retrieved an OOM exception.
-  JumpIfOOM(masm, exception, x10, throw_out_of_memory);
-
   // Clear the pending exception.
   __ Mov(x10, Operand(isolate->factory()->the_hole_value()));
   __ Str(x10, MemOperand(exception_address));
@@ -1697,13 +1677,11 @@ void CEntryStub::Generate(MacroAssembler* masm) {
 
   Label throw_normal;
   Label throw_termination;
-  Label throw_out_of_memory;
 
   // Call the runtime function.
   GenerateCore(masm,
                &throw_normal,
                &throw_termination,
-               &throw_out_of_memory,
                false,
                false);
 
@@ -1714,7 +1692,6 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   GenerateCore(masm,
                &throw_normal,
                &throw_termination,
-               &throw_out_of_memory,
                true,
                false);
 
@@ -1723,7 +1700,6 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   GenerateCore(masm,
                &throw_normal,
                &throw_termination,
-               &throw_out_of_memory,
                true,
                true);
 
@@ -1740,27 +1716,6 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   // If we throw an exception, we can end up re-entering CEntryStub before we
   // pop the exit frame, so need to ensure that x21-x23 contain GC-safe values
   // here.
-  __ Bind(&throw_out_of_memory);
-  ASM_LOCATION("Throw out of memory");
-  __ Mov(argv, 0);
-  __ Mov(argc, 0);
-  __ Mov(target, 0);
-  // Set external caught exception to false.
-  Isolate* isolate = masm->isolate();
-  __ Mov(x2, Operand(ExternalReference(Isolate::kExternalCaughtExceptionAddress,
-                                       isolate)));
-  __ Str(xzr, MemOperand(x2));
-
-  // Set pending exception and x0 to out of memory exception.
-  Label already_have_failure;
-  JumpIfOOM(masm, x0, x10, &already_have_failure);
-  Failure* out_of_memory = Failure::OutOfMemoryException(0x1);
-  __ Mov(x0, Operand(reinterpret_cast<uint64_t>(out_of_memory)));
-  __ Bind(&already_have_failure);
-  __ Mov(x2, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
-                                       isolate)));
-  __ Str(x0, MemOperand(x2));
-  // Fall through to the next label.
 
   __ Bind(&throw_termination);
   ASM_LOCATION("Throw termination");