cgo checkpoint.

can write all 3 output files and then compile them by hand.

R=r
DELTA=919  (841 added, 16 deleted, 62 changed)
OCL=34954
CL=34973

2 files changed, 27 insertions, 1 deletions

diff --git a/src/pkg/runtime/cgocall.c b/src/pkg/runtime/cgocall.c
index 3c9819b09d..9022267a1f 100644
--- a/src/pkg/runtime/cgocall.c
+++ b/src/pkg/runtime/cgocall.c
@@ -47,3 +47,26 @@ runtime·Cgocalls(int64 ret)
 	FLUSH(&ret);
 }
 
+void (*_cgo_malloc)(void*);
+void (*_cgo_free)(void*);
+
+void*
+cmalloc(uintptr n)
+{
+	struct a {
+		uint64 n;
+		void *ret;
+	} a;
+
+	a.n = n;
+	a.ret = nil;
+	cgocall(_cgo_malloc, &a);
+	return a.ret;
+}
+
+void
+cfree(void *p)
+{
+	cgocall(_cgo_free, p);
+}
+
diff --git a/src/pkg/runtime/cgocall.h b/src/pkg/runtime/cgocall.h
index bf3cf77278..5352a2f92e 100644
--- a/src/pkg/runtime/cgocall.h
+++ b/src/pkg/runtime/cgocall.h
@@ -5,7 +5,8 @@
 /*
  * Cgo interface.
  * Dynamically linked shared libraries compiled with gcc
- * know these data structures too.  See ../../libcgo/cgocall.c
+ * know these data structures and functions too.
+ * See ../../libcgo/cgocall.c
  */
 
 typedef struct CgoWork CgoWork;
@@ -37,3 +38,5 @@ struct CgoWork
 
 void cgocall(void (*fn)(void*), void*);
 
+void *cmalloc(uintptr);
+void cfree(void*);