First simplistic implementation of escape analysis.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index b03bf699389be7864587415c6143280159f27979..3932cebef4ff4d6f93e3421987c20f1b23482130 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -26,7 +26,6 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "hydrogen.h"
-#include "hydrogen-gvn.h"
 
 #include <algorithm>
 
@@ -35,6 +34,8 @@
 #include "full-codegen.h"
 #include "hashmap.h"
 #include "hydrogen-environment-liveness.h"
+#include "hydrogen-escape-analysis.h"
+#include "hydrogen-gvn.h"
 #include "lithium-allocator.h"
 #include "parser.h"
 #include "scopeinfo.h"
@@ -3983,6 +3984,7 @@ bool HGraph::Optimize(SmartArrayPointer<char>* bailout_reason) {
   }
 
   PropagateDeoptimizingMark();
+

[titzer, 2013/06/28 12:40:55]

Whitespace change

[Michael Starzinger, 2013/06/28 13:37:27]

Done.

   if (!CheckConstPhiUses()) {
     *bailout_reason = SmartArrayPointer<char>(StrDup(
         "Unsupported phi use of const variable"));
@@ -4029,6 +4031,11 @@ bool HGraph::Optimize(SmartArrayPointer<char>* bailout_reason) {
 
   if (FLAG_use_canonicalizing) Canonicalize();
 
+  if (FLAG_use_escape_analysis) {
+    HEscapeAnalysis escapeAnalysis(this);

[Jakob Kummerow, 2013/06/28 12:34:26]

nit: unix_hacker_style for variable names

[Michael Starzinger, 2013/06/28 12:39:37]

Done (also for the range analysis below).

+    escapeAnalysis.Analyze();
+  }
+
   if (FLAG_use_gvn) GlobalValueNumbering();
 
   if (FLAG_use_range) {