VM: New calling convention for generated code.

runtime/vm/instructions_x64.cc

Index: runtime/vm/instructions_x64.cc
diff --git a/runtime/vm/instructions_x64.cc b/runtime/vm/instructions_x64.cc
index 51128dd23901b88e6fcec7c2b64b5a5b046c8ad4..58322927d16a88ce2614ea1f18467ad3daba3193 100644
--- a/runtime/vm/instructions_x64.cc
+++ b/runtime/vm/instructions_x64.cc
@@ -36,25 +36,34 @@ bool InstructionPattern::TestBytesWith(const int* data, int num_bytes) const {
 }
 
 
-uword JumpPattern::TargetAddress() const {
+RawCode* JumpPattern::TargetCode() const {
   ASSERT(IsValid());
   int index = InstructionPattern::IndexFromPPLoad(start() + 3);
-  return object_pool_.RawValueAt(index);
+  Code& code = Code::Handle();
+  code ^= object_pool_.ObjectAt(index);
+  return code.raw();
 }
 
 
-void JumpPattern::SetTargetAddress(uword target) const {
+void JumpPattern::SetTargetCode(const Code& target) const {
   ASSERT(IsValid());
   int index = InstructionPattern::IndexFromPPLoad(start() + 3);
-  object_pool_.SetRawValueAt(index, target);
+  object_pool_.SetObjectAt(index, target);
   // No need to flush the instruction cache, since the code is not modified.
 }
 
 
 const int* JumpPattern::pattern() const {
-  //  07: 41 ff a7 imm32  jmpq [reg + off]
+  //  0: 4d 8b a5 imm32   movq CR, [PP + offs]
+  //  7: 4d 8b 5c 24 07   movq TMP, [CR + insns_offs]
+  // 12: 49 83 c3 1f      addq TMP, entry_offs
+  // 16: 41 ff e3         jmp TMP
+  // 19:
   static const int kJumpPattern[kLengthInBytes] =
-      {0x41, 0xFF, -1, -1, -1, -1, -1};
+      {0x4d, 0x8b, -1, -1, -1, -1, -1,
+       0x4d, 0x8b, 0x5c, 0x24, 0x07,
+       0x49, 0x83, 0xc3, 0x1f,
+       0x41, 0xff, 0xe3};
   return kJumpPattern;
 }