PPC: [Interpreter] Fix incorrect frame walking in arguments create stubs

Port 40f34541

Original commit message:

    The previous approach taken by FastNew[Sloppy,Strict,Rest]ArgumentsStub
    looked at the function slot in order to skip stub frames
    and find the JS frame. However, stub frames do not have a
    function slot (in fact their fixed frame ends one slot
    before the JS frame's function slot). Therefore, if this
    location in the stub frame happens to have the function
    object the create arguments stubs won't skip this frame
    correctly.

    Replace this approach with one where the stub is
    specialized to either skip a frame if required (since
    there will only ever be one extra frame on Ignition
    the loop approach isn't necessary).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4928
LOG=N

Review-Url: https://codereview.chromium.org/1966263002
Cr-Commit-Position: refs/heads/master@{#36186}

src/ppc/code-stubs-ppc.cc

@@ -4778,20 +4778,20 @@ void FastNewRestParameterStub::Generate(MacroAssembler* masm) {
   // -----------------------------------
   __ AssertFunction(r4);
 
-  // For Ignition we need to skip all possible handler/stub frames until
-  // we reach the JavaScript frame for the function (similar to what the
-  // runtime fallback implementation does). So make r5 point to that
-  // JavaScript frame.
-  {
-    Label loop, loop_entry;
-    __ mr(r5, fp);
-    __ b(&loop_entry);
-    __ bind(&loop);
+  // Make r5 point to the JavaScript frame.
+  __ mr(r5, fp);
+  if (skip_stub_frame()) {
+    // For Ignition we need to skip the handler/stub frame to reach the
+    // JavaScript frame for the function.
     __ LoadP(r5, MemOperand(r5, StandardFrameConstants::kCallerFPOffset));
-    __ bind(&loop_entry);
+  }
+  if (FLAG_debug_code) {
+    Label ok;
     __ LoadP(ip, MemOperand(r5, StandardFrameConstants::kFunctionOffset));
     __ cmp(ip, r4);
-    __ bne(&loop);
+    __ beq(&ok);
+    __ Abort(kInvalidFrameForFastNewRestArgumentsStub);
+    __ bind(&ok);
   }
 
   // Check if we have rest parameters (only possible if we have an
@@ -4922,20 +4922,20 @@ void FastNewSloppyArgumentsStub::Generate(MacroAssembler* masm) {
   // -----------------------------------
   __ AssertFunction(r4);
 
-  // For Ignition we need to skip all possible handler/stub frames until
-  // we reach the JavaScript frame for the function (similar to what the
-  // runtime fallback implementation does). So make r10 point to that
-  // JavaScript frame.
-  {
-    Label loop, loop_entry;
-    __ mr(r10, fp);
-    __ b(&loop_entry);
-    __ bind(&loop);
+  // Make r10 point to the JavaScript frame.
+  __ mr(r10, fp);
+  if (skip_stub_frame()) {
+    // For Ignition we need to skip the handler/stub frame to reach the
+    // JavaScript frame for the function.
     __ LoadP(r10, MemOperand(r10, StandardFrameConstants::kCallerFPOffset));
-    __ bind(&loop_entry);
+  }
+  if (FLAG_debug_code) {
+    Label ok;
     __ LoadP(ip, MemOperand(r10, StandardFrameConstants::kFunctionOffset));
     __ cmp(ip, r4);
-    __ bne(&loop);
+    __ beq(&ok);
+    __ Abort(kInvalidFrameForFastNewRestArgumentsStub);
+    __ bind(&ok);
   }
 
 
@@ -5192,20 +5192,20 @@ void FastNewStrictArgumentsStub::Generate(MacroAssembler* masm) {
   // -----------------------------------
   __ AssertFunction(r4);
 
-  // For Ignition we need to skip all possible handler/stub frames until
-  // we reach the JavaScript frame for the function (similar to what the
-  // runtime fallback implementation does). So make r5 point to that
-  // JavaScript frame.
-  {
-    Label loop, loop_entry;
-    __ mr(r5, fp);
-    __ b(&loop_entry);
-    __ bind(&loop);
+  // Make r5 point to the JavaScript frame.
+  __ mr(r5, fp);
+  if (skip_stub_frame()) {
+    // For Ignition we need to skip the handler/stub frame to reach the
+    // JavaScript frame for the function.
     __ LoadP(r5, MemOperand(r5, StandardFrameConstants::kCallerFPOffset));
-    __ bind(&loop_entry);
+  }
+  if (FLAG_debug_code) {
+    Label ok;
     __ LoadP(ip, MemOperand(r5, StandardFrameConstants::kFunctionOffset));
     __ cmp(ip, r4);
-    __ bne(&loop);
+    __ b(&ok);
+    __ Abort(kInvalidFrameForFastNewRestArgumentsStub);
+    __ bind(&ok);
   }
 
   // Check if we have an arguments adaptor frame below the function frame.