Allows unboxed doubles to be disabled.

runtime/vm/disassembler_arm.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
+
 #include "platform/assert.h"
+#include "vm/cpu.h"
 
 namespace dart {
 
 class ARMDecoder : public ValueObject {
  public:
   ARMDecoder(char* buffer, size_t buffer_size)
       : buffer_(buffer),
         buffer_size_(buffer_size),
         buffer_pos_(0) {
     buffer_[buffer_pos_] = '\0';
@@ skipping 667 matching lines @@
           }
           break;
         }
         default: {
           Unknown(instr);  // Not used.
           break;
         }
       }
     } else if (instr->IsMultiplyOrSyncPrimitive()) {
       if (instr->Bit(24) == 0) {
+        if ((TargetCPUFeatures::arm_version() != ARMv7) &&
+            (instr->Bits(21, 3) != 0)) {
+          // mla ... smlal only supported on armv7.
+          Unknown(instr);
+          return;
+        }
         // multiply instructions
         switch (instr->Bits(21, 3)) {
           case 0: {
             // Assembler registers rd, rn, rm are encoded as rn, rm, rs.
             Format(instr, "mul'cond's 'rn, 'rm, 'rs");
             break;
           }
           case 1: {
             // Assembler registers rd, rn, rm, ra are encoded as rn, rm, rs, rd.
             Format(instr, "mla'cond's 'rn, 'rm, 'rs, 'rd");
@@ skipping 43 matching lines @@
           default: {
             Unknown(instr);  // Not used.
             break;
           }
         }
       }
     } else if (instr->Bit(25) == 1) {
       // 16-bit immediate loads, msr (immediate), and hints
       switch (instr->Bits(20, 5)) {
         case 16: {
-          Format(instr, "movw'cond 'rd, #'imm4_12");
+          if (TargetCPUFeatures::arm_version() == ARMv7) {
+            Format(instr, "movw'cond 'rd, #'imm4_12");
+          } else {
+            Unknown(instr);
+          }
           break;
         }
         case 18: {
           if ((instr->Bits(16, 4) == 0) && (instr->Bits(0, 8) == 0)) {
             Format(instr, "nop'cond");
           } else {
             Unknown(instr);  // Not used.
           }
           break;
         }
         case 20: {
-          Format(instr, "movt'cond 'rd, #'imm4_12");
+          if (TargetCPUFeatures::arm_version() == ARMv7) {
+            Format(instr, "movt'cond 'rd, #'imm4_12");
+          } else {
+            Unknown(instr);
+          }
           break;
         }
         default: {
           Unknown(instr);  // Not used.
           break;
         }
       }
     } else {
       // extra load/store instructions
       switch (instr->PUField()) {
@@ skipping 158 matching lines @@
       // The PU field is a 2-bit field.
       UNREACHABLE();
       break;
     }
   }
 }
 
 
 void ARMDecoder::DecodeType3(Instr* instr) {
   if (instr->IsDivision()) {
+    if (!TargetCPUFeatures::integer_division_supported()) {
+      Unknown(instr);
+      return;
+    }
     if (instr->Bit(21)) {
       Format(instr, "udiv'cond 'rn, 'rs, 'rm");
     } else {
       Format(instr, "sdiv'cond 'rn, 'rs, 'rm");
     }
     return;
   }
   switch (instr->PUField()) {
     case 0: {
       if (instr->HasW()) {
@@ skipping 565 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM