Fix compose-discard crasher from 11524 - port to x64, ARM, MIPS.

src/mips/lithium-codegen-mips.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 2327 matching lines @@
   }
 }
 
 
 void LCodeGen::DoLoadNamedFieldPolymorphic(LLoadNamedFieldPolymorphic* instr) {
   Register object = ToRegister(instr->object());
   Register result = ToRegister(instr->result());
   Register scratch = scratch0();
   int map_count = instr->hydrogen()->types()->length();
   Handle<String> name = instr->hydrogen()->name();
-  if (map_count == 0) {
-    ASSERT(instr->hydrogen()->need_generic());
+  if (map_count == 0 && instr->hydrogen()->need_generic()) {
     __ li(a2, Operand(name));
     Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
     CallCode(ic, RelocInfo::CODE_TARGET, instr);
   } else {
     Label done;
     __ lw(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
     for (int i = 0; i < map_count - 1; ++i) {
       Handle<Map> map = instr->hydrogen()->types()->at(i);
       Label next;
       __ Branch(&next, ne, scratch, Operand(map));
       EmitLoadFieldOrConstantFunction(result, object, map, name);
       __ Branch(&done);
       __ bind(&next);
     }
-    Handle<Map> map = instr->hydrogen()->types()->last();
     if (instr->hydrogen()->need_generic()) {
-      Label generic;
-      __ Branch(&generic, ne, scratch, Operand(map));
-      EmitLoadFieldOrConstantFunction(result, object, map, name);
-      __ Branch(&done);
-      __ bind(&generic);
+      if (map_count != 0) {
+        Handle<Map> map = instr->hydrogen()->types()->last();
+        Label generic;
+        __ Branch(&generic, ne, scratch, Operand(map));
+        EmitLoadFieldOrConstantFunction(result, object, map, name);
+        __ Branch(&done);
+        __ bind(&generic);
+      }
       __ li(a2, Operand(name));
       Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
       CallCode(ic, RelocInfo::CODE_TARGET, instr);
     } else {
-      DeoptimizeIf(ne, instr->environment(), scratch, Operand(map));
-      EmitLoadFieldOrConstantFunction(result, object, map, name);
+      if (map_count != 0) {
+        Handle<Map> map = instr->hydrogen()->types()->last();
+        DeoptimizeIf(ne, instr->environment(), scratch, Operand(map));
+        EmitLoadFieldOrConstantFunction(result, object, map, name);
+      } else {
+        DeoptimizeIf(al, instr->environment(), zero_reg, Operand(zero_reg));
+      }
     }
     __ bind(&done);
   }
 }
 
 
 void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
   ASSERT(ToRegister(instr->object()).is(a0));
   ASSERT(ToRegister(instr->result()).is(v0));
 
@@ skipping 2738 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal