RFC: Switch to ast ids (instead of positions) for type feedback.

src/v8globals.h

Index: src/v8globals.h
diff --git a/src/v8globals.h b/src/v8globals.h
index 65bbf6ab24594f9c84c7ec3106de4629782d0b16..0619a5744c18727f9ccc9bf233c33573fbcdd0a8 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -104,6 +104,10 @@ const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
 // If looking only at the top 32 bits, the QNaN mask is bits 19 to 30.
 const uint32_t kQuietNaNHighBitsMask = 0xfff << (51 - 32);
 
+// AST node ids.
+typedef unsigned AstId;

[fschneider, 2011/02/11 11:28:18]

Maybe consider leaving ast id as integers (like before) - although I like having
a separate type AstId, I'm not sure if the typedef alone gives us much benefit
overall.

It would also affect less source lines if we leave the type for ast ids
unchanged (i.e. making it easier to merge).

+const AstId kNoAstId = static_cast<AstId>(-1);
+
 
 // -----------------------------------------------------------------------------
 // Forward declarations for frequently used classes