Contribution of PowerPC port (continuation of 422063005) - PPC dir update 2 - mark2

src/ppc/disasm-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A Disassembler object is used to disassemble a block of code instruction by
 // instruction. The default implementation of the NameConverter object can be
 // overriden to modify register names or to do symbol lookup on addresses.
 //
 // The example below will disassemble a block of code and print it to stdout.
 //
@@ skipping 970 matching lines @@
 
 #undef VERIFIY
 
 // Disassemble the instruction at *instr_ptr into the output buffer.
 int Decoder::InstructionDecode(byte* instr_ptr) {
   Instruction* instr = Instruction::At(instr_ptr);
   // Print raw instruction bytes.
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%08x       ",
                               instr->InstructionBits());
 
+#if ABI_USES_FUNCTION_DESCRIPTORS
+  // The first field will be identified as a jump table entry.  We emit the rest
+  // of the structure as zero, so just skip past them.
+  if (instr->InstructionBits() == 0) {
+    Format(instr, "constant");
+    return Instruction::kInstrSize;
+  }
+#endif
+
   switch (instr->OpcodeValue() << 26) {
     case TWI: {
       PrintSoftwareInterrupt(instr->SvcValue());
       break;
     }
     case MULLI: {
       UnknownFormat(instr, "mulli");
       break;
     }
     case SUBFIC: {
@@ skipping 354 matching lines @@
     pc += d.InstructionDecode(buffer, pc);
     v8::internal::PrintF(f, "%p    %08x      %s\n", prev_pc,
                          *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_PPC