AArch64: Revert setting of elf class in linker stub.

[deliverable/binutils-gdb.git] / gdb / ax.h

diff --git a/gdb/ax.h b/gdb/ax.h
index a12457501018020da26751af0feb51fbe673e995..65868938dded26314423cc6abfcc270738ef44fc 100644 (file)
--- a/gdb/ax.h
+++ b/gdb/ax.h
@@ -1,6 +1,5 @@
 /* Definitions for expressions designed to be executed on the agent
-   Copyright (C) 1998, 1999, 2000, 2007, 2008, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright (C) 1998-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -17,10 +16,8 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#ifndef AGENTEXPR_H
-#define AGENTEXPR_H
-
-#include "doublest.h"          /* For DOUBLEST.  */
+#ifndef AX_H
+#define AX_H
 
 /* It's sometimes useful to be able to debug programs that you can't
    really stop for more than a fraction of a second.  To this end, the
@@ -80,20 +77,14 @@ enum agent_flaws
 
 /* Agent expression data structures.  */
 
-/* The type of an element of the agent expression stack.
-   The bytecode operation indicates which element we should access;
-   the value itself has no typing information.  GDB generates all
-   bytecode streams, so we don't have to worry about type errors.  */
-
-union agent_val
-  {
-    LONGEST l;
-    DOUBLEST d;
-  };
-
 /* A buffer containing a agent expression.  */
 struct agent_expr
   {
+    /* Construct an empty agent expression.  */
+    explicit agent_expr (struct gdbarch *gdbarch, CORE_ADDR scope);
+
+    ~agent_expr ();
+
     /* The bytes of the expression.  */
     unsigned char *buf;
 
@@ -143,15 +134,35 @@ struct agent_expr
     */
     int reg_mask_len;
     unsigned char *reg_mask;
+
+    /* For the data tracing facility, we need to insert `trace' bytecodes
+       before each data fetch; this records all the memory that the
+       expression touches in the course of evaluation, so that memory will
+       be available when the user later tries to evaluate the expression
+       in GDB.
+
+       Setting the flag 'tracing' to non-zero enables the code that
+       emits the trace bytecodes at the appropriate points.  */
+
+    unsigned int tracing : 1;
+
+    /* This indicates that pointers to chars should get an added
+       tracenz bytecode to record nonzero bytes, up to a length that
+       is the value of trace_string.  */
+
+    int trace_string;
   };
 
+/* An agent_expr owning pointer.  */
+typedef std::unique_ptr<agent_expr> agent_expr_up;
+
 /* The actual values of the various bytecode operations.  */
 
 enum agent_op
   {
 #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE)  \
     aop_ ## NAME = VALUE,
-#include "ax.def"
+#include "gdbsupport/ax.def"
 #undef DEFOP
     aop_last
   };
@@ -160,12 +171,8 @@ enum agent_op
 
 /* Functions for building expressions.  */
 
-/* Allocate a new, empty agent expression.  */
-extern struct agent_expr *new_agent_expr (struct gdbarch *, CORE_ADDR);
-
-/* Free a agent expression.  */
-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);
@@ -213,6 +220,9 @@ extern void ax_reg_mask (struct agent_expr *ax, int reg);
 
 /* Assemble code to operate on a trace state variable.  */
 extern void ax_tsv (struct agent_expr *expr, enum agent_op op, int num);
+
+/* Append a string to the bytecode stream.  */
+extern void ax_string (struct agent_expr *x, const char *str, int slen);
 \f
 
 /* Functions for printing out expressions, and otherwise debugging
@@ -255,4 +265,4 @@ extern struct aop_map aop_map[];
 
 extern void ax_reqs (struct agent_expr *ax);
 
-#endif /* AGENTEXPR_H */
+#endif /* AX_H */