/* GDB-specific functions for operating on agent expressions.
- Copyright (C) 1998, 1999, 2000, 2001, 2003, 2007, 2008, 2009, 2010
- Free Software Foundation, Inc.
+ Copyright (C) 1998-2001, 2003, 2007-2012 Free Software Foundation,
+ Inc.
This file is part of GDB.
#include "breakpoint.h"
#include "tracepoint.h"
#include "cp-support.h"
+#include "arch-utils.h"
+
+#include "valprint.h"
+#include "c-lang.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,
\f
-/* Prototypes for local functions. */
+/* Prototypes for local functions. */
/* There's a standard order to the arguments of these functions:
union exp_element ** --- pointer into expression
static struct value *const_expr (union exp_element **pc);
static struct value *maybe_const_expr (union exp_element **pc);
-static void gen_traced_pop (struct gdbarch *, struct agent_expr *, struct axs_value *);
+static void gen_traced_pop (struct gdbarch *, struct agent_expr *,
+ struct axs_value *);
static void gen_sign_extend (struct agent_expr *, struct type *);
static void gen_extend (struct agent_expr *, struct type *);
emits the trace bytecodes at the appropriate points. */
int trace_kludge;
+/* Inspired by trace_kludge, 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_kludge. */
+int trace_string_kludge;
+
/* Scan for all static fields in the given class, including any base
classes, and generate tracing bytecodes for each. */
gen_traced_pop (struct gdbarch *gdbarch,
struct agent_expr *ax, struct axs_value *value)
{
+ int string_trace = 0;
+ if (trace_string_kludge
+ && TYPE_CODE (value->type) == TYPE_CODE_PTR
+ && c_textual_element_type (check_typedef (TYPE_TARGET_TYPE (value->type)),
+ 's'))
+ string_trace = 1;
+
if (trace_kludge)
switch (value->kind)
{
case axs_rvalue:
- /* We don't trace rvalues, just the lvalues necessary to
- produce them. So just dispose of this value. */
- ax_simple (ax, aop_pop);
+ if (string_trace)
+ {
+ ax_const_l (ax, trace_string_kludge);
+ ax_simple (ax, aop_tracenz);
+ }
+ else
+ /* We don't trace rvalues, just the lvalues necessary to
+ produce them. So just dispose of this value. */
+ ax_simple (ax, aop_pop);
break;
case axs_lvalue_memory:
{
int length = TYPE_LENGTH (check_typedef (value->type));
+ if (string_trace)
+ ax_simple (ax, aop_dup);
+
/* There's no point in trying to use a trace_quick bytecode
here, since "trace_quick SIZE pop" is three bytes, whereas
"const8 SIZE trace" is also three bytes, does the same
work correctly for objects with large sizes. */
ax_const_l (ax, length);
ax_simple (ax, aop_trace);
+
+ if (string_trace)
+ {
+ ax_simple (ax, aop_ref32);
+ ax_const_l (ax, trace_string_kludge);
+ ax_simple (ax, aop_tracenz);
+ }
}
break;
larger than will fit in a stack, so just mark it for
collection and be done with it. */
ax_reg_mask (ax, value->u.reg);
+
+ /* But if the register points to a string, assume the value
+ will fit on the stack and push it anyway. */
+ if (string_trace)
+ {
+ ax_reg (ax, value->u.reg);
+ ax_const_l (ax, trace_string_kludge);
+ ax_simple (ax, aop_tracenz);
+ }
break;
}
else
gen_var_ref (struct gdbarch *gdbarch, struct agent_expr *ax,
struct axs_value *value, struct symbol *var)
{
- /* Dereference any typedefs. */
+ /* Dereference any typedefs. */
value->type = check_typedef (SYMBOL_TYPE (var));
value->optimized_out = 0;
case LOC_CONST_BYTES:
internal_error (__FILE__, __LINE__,
- _("gen_var_ref: LOC_CONST_BYTES symbols are not supported"));
+ _("gen_var_ref: LOC_CONST_BYTES "
+ "symbols are not supported"));
/* Variable at a fixed location in memory. Easy. */
case LOC_STATIC:
/* GCC does allow casts to yield lvalues, so this should be fixed
before merging these changes into the trunk. */
require_rvalue (ax, value);
- /* Dereference typedefs. */
+ /* Dereference typedefs. */
type = check_typedef (type);
switch (TYPE_CODE (type))
operator, used in error messages */
static void
gen_binop (struct agent_expr *ax, struct axs_value *value,
- struct axs_value *value1, struct axs_value *value2, enum agent_op op,
- enum agent_op op_unsigned, int may_carry, char *name)
+ struct axs_value *value1, struct axs_value *value2,
+ enum agent_op op, enum agent_op op_unsigned,
+ int may_carry, char *name)
{
/* We only handle INT op INT. */
if ((TYPE_CODE (value1->type) != TYPE_CODE_INT)
equal to the number of `one' bits in bytesize, but who cares? */
int fragment_count;
- /* Dereference any typedefs. */
+ /* Dereference any typedefs. */
type = check_typedef (type);
/* Can we fetch the number of bits requested at all? */
{
gen_static_field (exp->gdbarch, ax, value, type, i);
if (value->optimized_out)
- error (_("static field `%s' has been optimized out, cannot use"),
+ error (_("static field `%s' has been "
+ "optimized out, cannot use"),
field);
return 1;
}
struct type *basetype = check_typedef (TYPE_BASECLASS (type, i));
rslt = gen_struct_ref_recursive (exp, ax, value, field,
- offset + TYPE_BASECLASS_BITPOS (type, i) / TARGET_CHAR_BIT,
+ offset + TYPE_BASECLASS_BITPOS (type, i)
+ / TARGET_CHAR_BIT,
basetype);
if (rslt)
return 1;
}
else
{
- char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
+ const char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0);
if (sym)
{
gen_static_field (exp->gdbarch, ax, value, t, i);
if (value->optimized_out)
- error (_("static field `%s' has been optimized out, cannot use"),
+ error (_("static field `%s' has been "
+ "optimized out, cannot use"),
fieldname);
return 1;
}
return 0;
}
-/* Generate code for GDB's magical `repeat' operator.
+/* Generate code for GDB's magical `repeat' operator.
LVALUE @ INT creates an array INT elements long, and whose elements
have the same type as LVALUE, located in memory so that LVALUE is
its first element. For example, argv[0]@argc gives you the array
int length;
if (!v)
- error (_("Right operand of `@' must be a constant, in agent expressions."));
+ error (_("Right operand of `@' must be a "
+ "constant, in agent expressions."));
if (TYPE_CODE (value_type (v)) != TYPE_CODE_INT)
error (_("Right operand of `@' must be an integer."));
length = value_as_long (v);
ax_tsv (ax, aop_tracev, tsv->number);
}
else
- error (_("$%s is not a trace state variable, may not assign to it"), name);
+ error (_("$%s is not a trace state variable, "
+ "may not assign to it"), name);
}
else
error (_("May only assign to trace state variables"));
ax_tsv (ax, aop_tracev, tsv->number);
}
else
- error (_("$%s is not a trace state variable, may not assign to it"), name);
+ error (_("$%s is not a trace state variable, "
+ "may not assign to it"), name);
}
else
error (_("May only assign to trace state variables"));
if (reg == -1)
internal_error (__FILE__, __LINE__,
_("Register $%s not available"), name);
- if (reg >= gdbarch_num_regs (exp->gdbarch))
- error (_("'%s' is a pseudo-register; "
- "GDB cannot yet trace pseudoregister contents."),
+ /* No support for tracing user registers yet. */
+ if (reg >= gdbarch_num_regs (exp->gdbarch)
+ + gdbarch_num_pseudo_regs (exp->gdbarch))
+ error (_("'%s' is a user-register; "
+ "GDB cannot yet trace user-register contents."),
name);
value->kind = axs_lvalue_register;
value->u.reg = reg;
value->type = builtin_type (exp->gdbarch)->builtin_long_long;
}
else
- error (_("$%s is not a trace state variable; GDB agent expressions cannot use convenience variables."), name);
+ error (_("$%s is not a trace state variable; GDB agent "
+ "expressions cannot use convenience variables."), name);
}
break;
(*pc) += 3;
gen_expr (exp, pc, ax, value);
- /* I'm not sure I understand UNOP_MEMVAL entirely. I think
- it's just a hack for dealing with minsyms; you take some
- integer constant, pretend it's the address of an lvalue of
- the given type, and dereference it. */
- if (value->kind != axs_rvalue)
- /* This would be weird. */
- internal_error (__FILE__, __LINE__,
- _("gen_expr: OP_MEMVAL operand isn't an rvalue???"));
+
+ /* If we have an axs_rvalue or an axs_lvalue_memory, then we
+ already have the right value on the stack. For
+ axs_lvalue_register, we must convert. */
+ if (value->kind == axs_lvalue_register)
+ require_rvalue (ax, value);
+
value->type = type;
value->kind = axs_lvalue_memory;
}
case UNOP_PLUS:
(*pc)++;
- /* + FOO is equivalent to 0 + FOO, which can be optimized. */
+ /* + FOO is equivalent to 0 + FOO, which can be optimized. */
gen_expr (exp, pc, ax, value);
gen_usual_unary (exp, ax, value);
break;
case OP_THIS:
{
char *this_name;
- struct symbol *func, *sym;
+ struct symbol *sym, *func;
struct block *b;
+ const struct language_defn *lang;
- func = block_linkage_function (block_for_pc (ax->scope));
- this_name = language_def (SYMBOL_LANGUAGE (func))->la_name_of_this;
- b = SYMBOL_BLOCK_VALUE (func);
+ b = block_for_pc (ax->scope);
+ func = block_linkage_function (b);
+ lang = language_def (SYMBOL_LANGUAGE (func));
- /* 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, this_name, VAR_DOMAIN);
+ sym = lookup_language_this (lang, b);
if (!sym)
- error (_("no `%s' found"), this_name);
+ error (_("no `%s' found"), lang->la_name_of_this);
gen_var_ref (exp->gdbarch, ax, value, sym);
if (binop_types_user_defined_p (op, value1->type, value2->type))
{
- error (_("\
-cannot subscript requested type: cannot call user defined functions"));
+ error (_("cannot subscript requested type: "
+ "cannot call user defined functions"));
}
else
{
}
if (!is_integral_type (value2->type))
- error (_("Argument to arithmetic operation not a number or boolean."));
+ error (_("Argument to arithmetic operation "
+ "not a number or boolean."));
gen_ptradd (ax, value, value1, value2);
gen_deref (ax, value);
return ax;
}
+struct agent_expr *
+gen_trace_for_return_address (CORE_ADDR scope, struct gdbarch *gdbarch)
+{
+ struct cleanup *old_chain = 0;
+ struct agent_expr *ax = new_agent_expr (gdbarch, scope);
+ struct axs_value value;
+
+ old_chain = make_cleanup_free_agent_expr (ax);
+
+ trace_kludge = 1;
+
+ gdbarch_gen_return_address (gdbarch, ax, &value, scope);
+
+ /* Make sure we record the final object, and get rid of it. */
+ gen_traced_pop (gdbarch, ax, &value);
+
+ /* Oh, and terminate. */
+ ax_simple (ax, aop_end);
+
+ /* We have successfully built the agent expr, so cancel the cleanup
+ request. If we add more cleanups that we always want done, this
+ will have to get more complicated. */
+ discard_cleanups (old_chain);
+ return ax;
+}
+
static void
agent_command (char *exp, int from_tty)
{
if (exp == 0)
error_no_arg (_("expression to translate"));
- expr = parse_expression (exp);
- old_chain = make_cleanup (free_current_contents, &expr);
- agent = gen_trace_for_expr (get_frame_pc (fi), expr);
- make_cleanup_free_agent_expr (agent);
+ trace_string_kludge = 0;
+ if (*exp == '/')
+ exp = decode_agent_options (exp);
+
+ /* Recognize the return address collection directive specially. Note
+ that it is not really an expression of any sort. */
+ if (strcmp (exp, "$_ret") == 0)
+ {
+ agent = gen_trace_for_return_address (get_frame_pc (fi),
+ get_current_arch ());
+ old_chain = make_cleanup_free_agent_expr (agent);
+ }
+ else
+ {
+ expr = parse_expression (exp);
+ old_chain = make_cleanup (free_current_contents, &expr);
+ agent = gen_trace_for_expr (get_frame_pc (fi), expr);
+ make_cleanup_free_agent_expr (agent);
+ }
+
ax_reqs (agent);
ax_print (gdb_stdout, agent);
_initialize_ax_gdb (void)
{
add_cmd ("agent", class_maintenance, agent_command,
- _("Translate an expression into remote agent bytecode for tracing."),
+ _("Translate an expression into "
+ "remote agent bytecode for tracing."),
&maintenancelist);
add_cmd ("agent-eval", class_maintenance, agent_eval_command,
- _("Translate an expression into remote agent bytecode for evaluation."),
+ _("Translate an expression into remote "
+ "agent bytecode for evaluation."),
&maintenancelist);
}
projects / deliverable / binutils-gdb.git / blobdiff