X64: Add a jumptable to for deoptimization checks on X64....

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
===================================================================
--- src/x64/lithium-codegen-x64.cc	(revision 6957)
+++ src/x64/lithium-codegen-x64.cc	(working copy)
@@ -77,6 +77,7 @@
   return GeneratePrologue() &&
       GenerateBody() &&
       GenerateDeferredCode() &&
+      GenerateJumpTable() &&
       GenerateSafepointTable();
 }
 
@@ -240,6 +241,16 @@
 }
 
 
+bool LCodeGen::GenerateJumpTable() {
+ for (int i = 0; i < jump_table_.length(); i++) {
+    JumpTableEntry* info = jump_table_[i];
+    __ bind(&(info->label));
+    __ Jump(info->address, RelocInfo::RUNTIME_ENTRY);
+  }
+  return !is_aborted();
+}
+
+
 bool LCodeGen::GenerateDeferredCode() {
   ASSERT(is_generating());
   for (int i = 0; !is_aborted() && i < deferred_.length(); i++) {
@@ -512,10 +523,10 @@
   if (cc == no_condition) {
     __ Jump(entry, RelocInfo::RUNTIME_ENTRY);
   } else {
-    NearLabel done;
-    __ j(NegateCondition(cc), &done);
-    __ Jump(entry, RelocInfo::RUNTIME_ENTRY);
-    __ bind(&done);
+    JumpTableEntry* jump_info = new JumpTableEntry();

[Lasse Reichstein, 2011/02/28 08:42:30]

Can we generate the same jump more than once? (I.e., is there anything to save
by recognizing it and making only one entry in the jump-table).

[Rico, 2011/02/28 09:57:13]

Done.

+    jump_info->address = entry;

[Lasse Reichstein, 2011/02/28 08:42:30]

Set this in a constructor.

[Rico, 2011/02/28 09:57:13]

Done.

+    __ j(cc, &jump_info->label);
+    jump_table_.Add(jump_info);
   }
 }