[PATCH c++ 01/12] Introduce ax_raw_byte and use it

[Simon Marchi <simon.marchi@polymtl.ca>]

This patch was taken directly from Pedro's branch.

ax_simple is used to append an agent expression operator to an agent
expression string.  Therefore, it takes an enum agent_op as input.
There is an instance where it's called to append a raw byte, unrelated
to the enum.  It makes the build fail in C++ mode.

This patch introduces ax_raw_byte for that purpose and uses it.

gdb/ChangeLog:

	* ax.h (ax_raw_byte): New declaration.
	* ax-general.c (ax_raw_byte): New function.
	(ax_simple): Use ax_raw_byte.
	* ax-gdb.c (gen_printf): Likewise.
---
 gdb/ax-gdb.c     |  2 +-
 gdb/ax-general.c | 11 +++++++++--
 gdb/ax.h         |  3 +++
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/gdb/ax-gdb.c b/gdb/ax-gdb.c
index 817fa53..7091a4a 100644
--- a/gdb/ax-gdb.c
+++ b/gdb/ax-gdb.c
@@ -2564,7 +2564,7 @@ gen_printf (CORE_ADDR scope, struct gdbarch *gdbarch,
 
   /* Issue the printf bytecode proper.  */
   ax_simple (ax, aop_printf);
-  ax_simple (ax, nargs);
+  ax_raw_byte (ax, nargs);
   ax_string (ax, format, fmtlen);
 
   /* And terminate.  */
diff --git a/gdb/ax-general.c b/gdb/ax-general.c
index e5dc240..5c8a25b 100644
--- a/gdb/ax-general.c
+++ b/gdb/ax-general.c
@@ -133,13 +133,20 @@ read_const (struct agent_expr *x, int o, int n)
   return accum;
 }
 
+/* See ax.h.  */
+
+void
+ax_raw_byte (struct agent_expr *x, gdb_byte byte)
+{
+  grow_expr (x, 1);
+  x->buf[x->len++] = byte;
+}
 
 /* Append a simple operator OP to EXPR.  */
 void
 ax_simple (struct agent_expr *x, enum agent_op op)
 {
-  grow_expr (x, 1);
-  x->buf[x->len++] = op;
+  ax_raw_byte (x, op);
 }
 
 /* Append a pick operator to EXPR.  DEPTH is the stack item to pick,
diff --git a/gdb/ax.h b/gdb/ax.h
index eaa72dd..1714bb4 100644
--- a/gdb/ax.h
+++ b/gdb/ax.h
@@ -190,6 +190,9 @@ extern struct agent_expr *new_agent_expr (struct gdbarch *, CORE_ADDR);
 extern void free_agent_expr (struct agent_expr *);
 extern struct cleanup *make_cleanup_free_agent_expr (struct agent_expr *);
 
+/* Append a raw byte to EXPR.  */
+extern void ax_raw_byte (struct agent_expr *expr, gdb_byte byte);
+
 /* Append a simple operator OP to EXPR.  */
 extern void ax_simple (struct agent_expr *EXPR, enum agent_op OP);
 
-- 
2.6.2