compiler: initial support for exporting function bodies

    
    Create a framework for putting function bodies in export data.  At
    present only empty functions will be put there, and they will be
    ignored on import.  Later patches will get this to the point of
    supporting inlining of (some) functions defined in other packages.
    
    Reviewed-on: https://go-review.googlesource.com/c/150061

From-SVN: r266490

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/go/gofrontend/expressions.h b/gcc/go/gofrontend/expressions.h
index f53cc6e..33ea9b2 100644
--- a/gcc/go/gofrontend/expressions.h
+++ b/gcc/go/gofrontend/expressions.h
@@ -939,6 +939,11 @@ class Expression
   copy()
   { return this->do_copy(); }
 
+  // Return the cost of this statement for inlining purposes.
+  int
+  inlining_cost()
+  { return this->do_inlining_cost(); }
+
   // Return whether the expression is addressable--something which may
   // be used as the operand of the unary & operator.
   bool
@@ -1084,6 +1089,13 @@ class Expression
   virtual Expression*
   do_copy() = 0;
 
+  // Child class implements determining the cost of this statement for
+  // inlining.  The default cost is high, so we only need to define
+  // this method for expressions that can be inlined.
+  virtual int
+  do_inlining_cost()
+  { return 0x100000; }
+
   // Child class implements whether the expression is addressable.
   virtual bool
   do_is_addressable() const