Skeleton of a linear scan register allocator.

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
diff --git a/runtime/vm/il_printer.cc b/runtime/vm/il_printer.cc
index 1d33db8258171a8f89bbdedee61b048de87bf10c..1b18966db0383c7dd5e24ca88e2cfb282861c1e6 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -64,6 +64,10 @@ void FlowGraphPrinter::PrintInstruction(Instruction* instr) {
   if (FLAG_print_environments && (instr->env() != NULL)) {
     instr->env()->PrintTo(&f);
   }
+  if (print_locations_ && instr->locs() != NULL) {

[srdjan, 2012/07/10 23:27:54]

Add parenthesis.

[Vyacheslav Egorov (Google), 2012/07/11 13:27:58]

Done.

+    instr->locs()->PrintTo(&f);
+  }
+  if (instr->pos() != -1) OS::Print("%3d: ", instr->pos());
   OS::Print("%s", str);
 }
 
@@ -417,7 +421,11 @@ void BranchInstr::PrintTo(BufferFormatter* f) const {
 
 
 void ParallelMoveInstr::PrintTo(BufferFormatter* f) const {
-  UNIMPLEMENTED();
+  f->Print("    %s ", DebugName());
+  for (intptr_t i = 0; i < moves_.length(); i++) {
+    if (i != 0) f->Print(", ");
+    f->Print("%s = %s", moves_[i].dest().Name(), moves_[i].src().Name());
+  }
 }
 
 
@@ -667,6 +675,9 @@ void Environment::PrintTo(BufferFormatter* f) const {
   for (intptr_t i = 0; i < values_.length(); ++i) {
     if (i > 0) f->Print(", ");
     values_[i]->PrintTo(f);
+    if (i < locations_.length() && !locations_[i].IsInvalid()) {
+        f->Print(" [%s]", locations_[i].Name());

[srdjan, 2012/07/10 23:27:54]

Add parenthesis, fix indent.

[Vyacheslav Egorov (Google), 2012/07/11 13:27:58]

Done.

+    }
   }
   f->Print(" }");
 }