first attempt at real FFI support.

in a .6 file, an export line

	//ffi T localfib remotefib remote.so

means the dynamic linker should initialize
localfib, always a pointer, to the address of
remotefib, either text (T) or data (D) after
loading remote.so.

the C compiler will generate an export section
when given the pragmas

	#pragma package fib
	#pragma ffi T localfib remotefib remote.so

needing #pragma package is a bit of a kludge
and hopefully could go away later.

this is just the 6 tool chain support.
other architectures will happen once 6 settles down.

code using this to do FFI is in a later CL.

R=r
DELTA=161  (141 added, 14 deleted, 6 changed)
OCL=33783
CL=33795

1 files changed, 15 insertions, 0 deletions

diff --git a/src/cmd/cc/cc.h b/src/cmd/cc/cc.h
index 2ebea6f5f..9964681f1 100644
--- a/src/cmd/cc/cc.h
+++ b/src/cmd/cc/cc.h
@@ -49,6 +49,7 @@ typedef	struct	Hist	Hist;
 typedef	struct	Term	Term;
 typedef	struct	Init	Init;
 typedef	struct	Bits	Bits;
+typedef	struct	Ffi Ffi;
 
 #define	NHUNK		50000L
 #define	BUFSIZ		8192
@@ -436,6 +437,18 @@ struct	Funct
 	Sym*	castfr[NTYPE];
 };
 
+struct	Ffi
+{
+	char	type;
+	char*	local;
+	char*	remote;
+	char*	path;
+};
+
+EXTERN	Ffi	*ffi;
+EXTERN	int	nffi;
+EXTERN	char*	package;
+
 EXTERN struct
 {
 	Type*	tenum;		/* type of entire enum */
@@ -740,6 +753,8 @@ void	pragpack(void);
 void	pragfpround(void);
 void	pragtextflag(void);
 void	pragincomplete(void);
+void	pragffi(void);
+void	pragpackage(void);
 
 /*
  * calls to machine depend part