PPC: [stubs] Simplify the non-function case of CallConstructStub.

Port 622fa0ea

Original commit message:
    Currently we do this dance between the CallConstructStub, the
    CALL_* builtins and the %GetConstructorDelegate, %GetProxyTrap,
    and %Apply runtime functions for every [[Construct]] operation on
    non-function callables. This is complexity is unnecessary, and can
    be simplified to work without any JS builtin. This will also make it
    a lot easier to implement ES6 compliant [[Construct]] for proxies.

    Also sanitize the invariant for CallConstructStub, which up until now
    always restored the context itself, but that force us to always create
    another copy of all arguments in case of proxies and other callables,
    so we can relax that constraint by making the caller restore the context
    (this only affects fullcodegen, since the optimizing compilers already
    properly restore the context anyway).

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1338663003

Cr-Commit-Position: refs/heads/master@{#30696}

src/full-codegen/ppc/full-codegen-ppc.cc

@@ -3194,6 +3194,8 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
   CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
   PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
+  // Restore context register.
+  __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   context()->Plug(r3);
 }
 
@@ -3243,6 +3245,8 @@ void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
 
   RecordJSReturnSite(expr);
 
+  // Restore context register.
+  __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   context()->Plug(r3);
 }
 
@@ -4157,9 +4161,10 @@ void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);
   __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
-  __ Drop(1);
+  // Restore context register.
+  __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 
-  context()->Plug(result_register());
+  context()->DropAndPlug(1, r3);
 }
 
 

src/ppc/code-stubs-ppc.cc

@@ -2707,23 +2707,31 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
   // r3: number of arguments
   // r4: called object
   // r8: object type
-  Label do_call;
   __ bind(&slow);
+  {
     STATIC_ASSERT(JS_FUNCTION_PROXY_TYPE < 0xffffu);
     __ cmpi(r8, Operand(JS_FUNCTION_PROXY_TYPE));
     __ bne(&non_function_call);
-  __ GetBuiltinFunction(
-      r4, Context::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR_BUILTIN_INDEX);
-  __ b(&do_call);
+    // TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
+    __ LoadP(r4, FieldMemOperand(r4, JSFunctionProxy::kConstructTrapOffset));
+    __ Jump(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
 
     __ bind(&non_function_call);
-  __ GetBuiltinFunction(
-      r4, Context::CALL_NON_FUNCTION_AS_CONSTRUCTOR_BUILTIN_INDEX);
-  __ bind(&do_call);
-  // Set expected number of arguments to zero (not changing r3).
-  __ li(r5, Operand::Zero());
-  __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+    {
+      // Determine the delegate for the target (if any).
+      FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+      __ SmiTag(r3);
+      __ Push(r3, r4);
+      __ CallRuntime(Runtime::kGetConstructorDelegate, 1);
+      __ mr(r4, r3);
+      __ pop(r3);
+      __ SmiUntag(r3);
+    }
+    // The delegate is always a regular function.
+    __ AssertFunction(r4);
+    __ Jump(masm->isolate()->builtins()->CallFunction(),
             RelocInfo::CODE_TARGET);
+  }
 }