Subzero: Add sandboxing for x86-32.

src/assembler.cpp

 //===- subzero/src/assembler.cpp - Assembler base class -------------------===//
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 // This is forked from Dart revision 39313.
 // Please update the revision if we merge back changes from Dart.
 // https://code.google.com/p/dart/wiki/GettingTheSource
@@ skipping 22 matching lines @@
   return result;
 }
 
 AssemblerFixup *AssemblerBuffer::createFixup(FixupKind Kind,
                                              const Constant *Value) {
   AssemblerFixup *F =
       new (assembler_.Allocate<AssemblerFixup>()) AssemblerFixup();
   F->set_position(0);
   F->set_kind(Kind);
   F->set_value(Value);
-  fixups_.push_back(F);
+  if (!assembler_.getPreliminary())
+    fixups_.push_back(F);
   return F;
 }
 
 #ifndef NDEBUG
 AssemblerBuffer::EnsureCapacity::EnsureCapacity(AssemblerBuffer *buffer) {
   if (buffer->cursor() >= buffer->limit())
     buffer->ExtendCapacity();
   // In debug mode, we save the assembler buffer along with the gap
   // size before we start emitting to the buffer. This allows us to
   // check that any single generated instruction doesn't overflow the
@@ skipping 90 matching lines @@
   }
   // Handle any bytes that are not prefixed by a fixup.
   for (intptr_t i = CurPosition; i < EndPosition; ++i) {
     Str << "\t.byte 0x";
     Str.write_hex(buffer_.Load<uint8_t>(i));
     Str << "\n";
   }
 }
 
 } // end of namespace Ice