[PATCH] Handle OP_THIS in tracepoints
Stan Shebs
stan@codesourcery.com
Thu Dec 24 01:33:00 GMT 2009
This one comes up pretty quickly when doing tracepoints in C++; members
in expressions use OP_THIS, which amounts to shorthand for a reference
to the implicit argument "this". Handling is uncomplicated, mimics
expression evaluation.
Stan
2009-12-23 Stan Shebs <stan@codesourcery.com>
* ax-gdb.c (gen_expr): Handle OP_THIS.
Index: ax-gdb.c
===================================================================
RCS file: /cvs/src/src/gdb/ax-gdb.c,v
retrieving revision 1.54
diff -p -r1.54 ax-gdb.c
*** ax-gdb.c 24 Dec 2009 00:40:49 -0000 1.54
--- ax-gdb.c 24 Dec 2009 01:21:21 -0000
***************
*** 35,40 ****
--- 35,41 ----
#include "regcache.h"
#include "user-regs.h"
#include "language.h"
+ #include "dictionary.h"
/* To make sense of this file, you should read doc/agentexpr.texi.
Then look at the types and enums in ax-gdb.h. For the code itself,
*************** gen_expr (struct expression *exp, union
*** 1759,1764 ****
--- 1760,1797 ----
}
break;
+ case OP_THIS:
+ {
+ char *name;
+ struct frame_info *frame;
+ struct symbol *func, *sym;
+ struct block *b;
+
+ name = current_language->la_name_of_this;
+ if (!name)
+ error (_("no `this' in current language"));
+
+ frame = get_selected_frame (_("no frame selected"));
+
+ func = get_frame_function (frame);
+ if (!func)
+ error (_("no `%s' in nameless context"), name);
+
+ b = SYMBOL_BLOCK_VALUE (func);
+ if (dict_empty (BLOCK_DICT (b)))
+ error (_("no args, no `%s' in block"), name);
+
+ /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER
+ symbol instead of the LOC_ARG one (if both exist). */
+ sym = lookup_block_symbol (b, name, NULL, VAR_DOMAIN);
+ if (!sym)
+ error (_("no `%s' found"), name);
+
+ gen_var_ref (exp->gdbarch, ax, value, sym);
+ (*pc) += 2;
+ }
+ break;
+
case OP_TYPE:
error (_("Attempt to use a type name as an expression."));
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