[turbofan]: Implement tail calls with more callee than caller parameters

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index 61efb9bd8f9234dfe5dd4aee2e039254044fff42..e1b7d4b58645c83626dc8ab6c5bf01b29c82851a 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -57,6 +57,25 @@ class LinkageLocation {
     return LinkageLocation(STACK_SLOT, slot);
   }
 
+  static LinkageLocation ForSavedCallerReturnAddress() {
+    return ForCalleeFrameSlot((StandardFrameConstants::kCallerPCOffset -
+                               StandardFrameConstants::kCallerPCOffset) /
+                              kPointerSize);
+  }
+
+  static LinkageLocation ForSavedCallerFramePtr() {
+    return ForCalleeFrameSlot((StandardFrameConstants::kCallerPCOffset -
+                               StandardFrameConstants::kCallerFPOffset) /
+                              kPointerSize);
+  }
+
+  static LinkageLocation ForSavedCallerConstantPool() {
+    DCHECK(FLAG_enable_embedded_constant_pool);

[Benedikt Meurer, 2015/11/20 10:06:43]

This use of FLAG_something worries me. Can we somehow make that into a global
constant, because disabling that at runtime will not work anyway.

[danno, 2015/11/20 14:43:23]

Done.

+    return ForCalleeFrameSlot((StandardFrameConstants::kCallerPCOffset -
+                               StandardFrameConstants::kConstantPoolOffset) /
+                              kPointerSize);
+  }
+
   static LinkageLocation ConvertToTailCallerLocation(
       LinkageLocation caller_location, int stack_param_delta) {
     if (!caller_location.IsRegister()) {