/* GDB-specific functions for operating on agent expressions.
- Copyright (C) 1998, 1999, 2000, 2001, 2003, 2007, 2008, 2009
+ Copyright (C) 1998, 1999, 2000, 2001, 2003, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of GDB.
#include "symtab.h"
#include "symfile.h"
#include "gdbtypes.h"
+#include "language.h"
#include "value.h"
#include "expression.h"
#include "command.h"
#include "regcache.h"
#include "user-regs.h"
#include "language.h"
+#include "dictionary.h"
+#include "breakpoint.h"
+#include "tracepoint.h"
+#include "cp-support.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,
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 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 *);
static void gen_complement (struct agent_expr *ax, struct axs_value *value);
static void gen_deref (struct agent_expr *, struct axs_value *);
static void gen_address_of (struct agent_expr *, struct axs_value *);
-static int find_field (struct type *type, char *name);
static void gen_bitfield_ref (struct expression *exp, struct agent_expr *ax,
struct axs_value *value,
struct type *type, int start, int end);
+static void gen_primitive_field (struct expression *exp,
+ struct agent_expr *ax,
+ struct axs_value *value,
+ int offset, int fieldno, struct type *type);
+static int gen_struct_ref_recursive (struct expression *exp,
+ struct agent_expr *ax,
+ struct axs_value *value,
+ char *field, int offset,
+ struct type *type);
static void gen_struct_ref (struct expression *exp, struct agent_expr *ax,
struct axs_value *value,
char *field,
char *operator_name, char *operand_name);
+static void gen_static_field (struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value,
+ struct type *type, int fieldno);
static void gen_repeat (struct expression *exp, union exp_element **pc,
struct agent_expr *ax, struct axs_value *value);
static void gen_sizeof (struct expression *exp, union exp_element **pc,
struct type *size_type);
static void gen_expr (struct expression *exp, union exp_element **pc,
struct agent_expr *ax, struct axs_value *value);
+static void gen_expr_binop_rest (struct expression *exp,
+ enum exp_opcode op, union exp_element **pc,
+ struct agent_expr *ax,
+ struct axs_value *value,
+ struct axs_value *value1,
+ struct axs_value *value2);
static void agent_command (char *exp, int from_tty);
\f
emits the trace bytecodes at the appropriate points. */
static int trace_kludge;
+/* Scan for all static fields in the given class, including any base
+ classes, and generate tracing bytecodes for each. */
+
+static void
+gen_trace_static_fields (struct gdbarch *gdbarch,
+ struct agent_expr *ax,
+ struct type *type)
+{
+ int i, nbases = TYPE_N_BASECLASSES (type);
+ struct axs_value value;
+
+ CHECK_TYPEDEF (type);
+
+ for (i = TYPE_NFIELDS (type) - 1; i >= nbases; i--)
+ {
+ if (field_is_static (&TYPE_FIELD (type, i)))
+ {
+ gen_static_field (gdbarch, ax, &value, type, i);
+ if (value.optimized_out)
+ continue;
+ switch (value.kind)
+ {
+ case axs_lvalue_memory:
+ {
+ int length = TYPE_LENGTH (check_typedef (value.type));
+
+ ax_const_l (ax, length);
+ ax_simple (ax, aop_trace);
+ }
+ break;
+
+ case axs_lvalue_register:
+ /* We need to mention the register somewhere in the bytecode,
+ so ax_reqs will pick it up and add it to the mask of
+ registers used. */
+ ax_reg (ax, value.u.reg);
+
+ default:
+ break;
+ }
+ }
+ }
+
+ /* Now scan through base classes recursively. */
+ for (i = 0; i < nbases; i++)
+ {
+ struct type *basetype = check_typedef (TYPE_BASECLASS (type, i));
+
+ gen_trace_static_fields (gdbarch, ax, basetype);
+ }
+}
+
/* Trace the lvalue on the stack, if it needs it. In either case, pop
the value. Useful on the left side of a comma, and at the end of
an expression being used for tracing. */
static void
-gen_traced_pop (struct agent_expr *ax, struct axs_value *value)
+gen_traced_pop (struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value)
{
if (trace_kludge)
switch (value->kind)
else
/* If we're not tracing, just pop the value. */
ax_simple (ax, aop_pop);
+
+ /* To trace C++ classes with static fields stored elsewhere. */
+ if (trace_kludge
+ && (TYPE_CODE (value->type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (value->type) == TYPE_CODE_UNION))
+ gen_trace_static_fields (gdbarch, ax, value->type);
}
\f
switch (TYPE_CODE (type))
{
case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
case TYPE_CODE_ENUM:
case TYPE_CODE_INT:
case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
/* It's a scalar value, so we know how to dereference it. How
many bytes long is it? */
switch (TYPE_LENGTH (type))
{
/* Dereference any typedefs. */
value->type = check_typedef (SYMBOL_TYPE (var));
+ value->optimized_out = 0;
/* I'm imitating the code in read_var_value. */
switch (SYMBOL_CLASS (var))
break;
case LOC_OPTIMIZED_OUT:
- error (_("The variable `%s' has been optimized out."),
- SYMBOL_PRINT_NAME (var));
+ /* Flag this, but don't say anything; leave it up to callers to
+ warn the user. */
+ value->optimized_out = 1;
break;
default:
static void
require_rvalue (struct agent_expr *ax, struct axs_value *value)
{
+ /* Only deal with scalars, structs and such may be too large
+ to fit in a stack entry. */
+ value->type = check_typedef (value->type);
+ if (TYPE_CODE (value->type) == TYPE_CODE_ARRAY
+ || TYPE_CODE (value->type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (value->type) == TYPE_CODE_UNION
+ || TYPE_CODE (value->type) == TYPE_CODE_FUNC)
+ error (_("Value not scalar: cannot be an rvalue."));
+
switch (value->kind)
{
case axs_rvalue:
case TYPE_CODE_UNION:
return;
- /* If the value is an enum, call it an integer. */
+ /* If the value is an enum or a bool, call it an integer. */
case TYPE_CODE_ENUM:
+ case TYPE_CODE_BOOL:
value->type = builtin_type (exp->gdbarch)->builtin_int;
break;
}
switch (TYPE_CODE (type))
{
case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
/* It's implementation-defined, and I'll bet this is what GCC
does. */
break;
error (_("Invalid type cast: intended type must be scalar."));
case TYPE_CODE_ENUM:
+ case TYPE_CODE_BOOL:
/* We don't have to worry about the size of the value, because
all our integral values are fully sign-extended, and when
casting pointers we can do anything we like. Is there any
gen_ptradd (struct agent_expr *ax, struct axs_value *value,
struct axs_value *value1, struct axs_value *value2)
{
- gdb_assert (TYPE_CODE (value1->type) == TYPE_CODE_PTR);
+ gdb_assert (pointer_type (value1->type));
gdb_assert (TYPE_CODE (value2->type) == TYPE_CODE_INT);
gen_scale (ax, aop_mul, value1->type);
gen_ptrsub (struct agent_expr *ax, struct axs_value *value,
struct axs_value *value1, struct axs_value *value2)
{
- gdb_assert (TYPE_CODE (value1->type) == TYPE_CODE_PTR);
+ gdb_assert (pointer_type (value1->type));
gdb_assert (TYPE_CODE (value2->type) == TYPE_CODE_INT);
gen_scale (ax, aop_mul, value1->type);
struct axs_value *value1, struct axs_value *value2,
struct type *result_type)
{
- gdb_assert (TYPE_CODE (value1->type) == TYPE_CODE_PTR);
- gdb_assert (TYPE_CODE (value2->type) == TYPE_CODE_PTR);
+ gdb_assert (pointer_type (value1->type));
+ gdb_assert (pointer_type (value2->type));
if (TYPE_LENGTH (TYPE_TARGET_TYPE (value1->type))
!= TYPE_LENGTH (TYPE_TARGET_TYPE (value2->type)))
value->kind = axs_rvalue;
}
+static void
+gen_equal (struct agent_expr *ax, struct axs_value *value,
+ struct axs_value *value1, struct axs_value *value2,
+ struct type *result_type)
+{
+ if (pointer_type (value1->type) || pointer_type (value2->type))
+ ax_simple (ax, aop_equal);
+ else
+ gen_binop (ax, value, value1, value2,
+ aop_equal, aop_equal, 0, "equal");
+ value->type = result_type;
+ value->kind = axs_rvalue;
+}
+
+static void
+gen_less (struct agent_expr *ax, struct axs_value *value,
+ struct axs_value *value1, struct axs_value *value2,
+ struct type *result_type)
+{
+ if (pointer_type (value1->type) || pointer_type (value2->type))
+ ax_simple (ax, aop_less_unsigned);
+ else
+ gen_binop (ax, value, value1, value2,
+ aop_less_signed, aop_less_unsigned, 0, "less than");
+ value->type = result_type;
+ value->kind = axs_rvalue;
+}
/* Generate code for a binary operator that doesn't do pointer magic.
We set VALUE to describe the result value; we assume VALUE1 and
{
/* The caller should check the type, because several operators use
this, and we don't know what error message to generate. */
- if (TYPE_CODE (value->type) != TYPE_CODE_PTR)
+ if (!pointer_type (value->type))
internal_error (__FILE__, __LINE__,
_("gen_deref: expected a pointer"));
T" to "T", and mark the value as an lvalue in memory. Leave it
to the consumer to actually dereference it. */
value->type = check_typedef (TYPE_TARGET_TYPE (value->type));
+ if (TYPE_CODE (value->type) == TYPE_CODE_VOID)
+ error (_("Attempt to dereference a generic pointer."));
value->kind = ((TYPE_CODE (value->type) == TYPE_CODE_FUNC)
? axs_rvalue : axs_lvalue_memory);
}
}
}
-
-/* A lot of this stuff will have to change to support C++. But we're
- not going to deal with that at the moment. */
-
-/* Find the field in the structure type TYPE named NAME, and return
- its index in TYPE's field array. */
-static int
-find_field (struct type *type, char *name)
-{
- int i;
-
- CHECK_TYPEDEF (type);
-
- /* Make sure this isn't C++. */
- if (TYPE_N_BASECLASSES (type) != 0)
- internal_error (__FILE__, __LINE__,
- _("find_field: derived classes supported"));
-
- for (i = 0; i < TYPE_NFIELDS (type); i++)
- {
- char *this_name = TYPE_FIELD_NAME (type, i);
-
- if (this_name)
- {
- if (strcmp (name, this_name) == 0)
- return i;
-
- if (this_name[0] == '\0')
- internal_error (__FILE__, __LINE__,
- _("find_field: anonymous unions not supported"));
- }
- }
-
- error (_("Couldn't find member named `%s' in struct/union `%s'"),
- name, TYPE_TAG_NAME (type));
-
- return 0;
-}
-
-
/* Generate code to push the value of a bitfield of a structure whose
address is on the top of the stack. START and END give the
starting and one-past-ending *bit* numbers of the field within the
value->type = type;
}
+/* Generate bytecodes for field number FIELDNO of type TYPE. OFFSET
+ is an accumulated offset (in bytes), will be nonzero for objects
+ embedded in other objects, like C++ base classes. Behavior should
+ generally follow value_primitive_field. */
+
+static void
+gen_primitive_field (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ int offset, int fieldno, struct type *type)
+{
+ /* Is this a bitfield? */
+ if (TYPE_FIELD_PACKED (type, fieldno))
+ gen_bitfield_ref (exp, ax, value, TYPE_FIELD_TYPE (type, fieldno),
+ (offset * TARGET_CHAR_BIT
+ + TYPE_FIELD_BITPOS (type, fieldno)),
+ (offset * TARGET_CHAR_BIT
+ + TYPE_FIELD_BITPOS (type, fieldno)
+ + TYPE_FIELD_BITSIZE (type, fieldno)));
+ else
+ {
+ gen_offset (ax, offset
+ + TYPE_FIELD_BITPOS (type, fieldno) / TARGET_CHAR_BIT);
+ value->kind = axs_lvalue_memory;
+ value->type = TYPE_FIELD_TYPE (type, fieldno);
+ }
+}
+
+/* Search for the given field in either the given type or one of its
+ base classes. Return 1 if found, 0 if not. */
+
+static int
+gen_struct_ref_recursive (struct expression *exp, struct agent_expr *ax,
+ struct axs_value *value,
+ char *field, int offset, struct type *type)
+{
+ int i, rslt;
+ int nbases = TYPE_N_BASECLASSES (type);
+
+ CHECK_TYPEDEF (type);
+
+ for (i = TYPE_NFIELDS (type) - 1; i >= nbases; i--)
+ {
+ char *this_name = TYPE_FIELD_NAME (type, i);
+
+ if (this_name)
+ {
+ if (strcmp (field, this_name) == 0)
+ {
+ /* Note that bytecodes for the struct's base (aka
+ "this") will have been generated already, which will
+ be unnecessary but not harmful if the static field is
+ being handled as a global. */
+ if (field_is_static (&TYPE_FIELD (type, i)))
+ {
+ gen_static_field (exp->gdbarch, ax, value, type, i);
+ if (value->optimized_out)
+ error (_("static field `%s' has been optimized out, cannot use"),
+ field);
+ return 1;
+ }
+
+ gen_primitive_field (exp, ax, value, offset, i, type);
+ return 1;
+ }
+#if 0 /* is this right? */
+ if (this_name[0] == '\0')
+ internal_error (__FILE__, __LINE__,
+ _("find_field: anonymous unions not supported"));
+#endif
+ }
+ }
+
+ /* Now scan through base classes recursively. */
+ for (i = 0; i < nbases; i++)
+ {
+ 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,
+ basetype);
+ if (rslt)
+ return 1;
+ }
+
+ /* Not found anywhere, flag so caller can complain. */
+ return 0;
+}
/* Generate code to reference the member named FIELD of a structure or
union. The top of the stack, as described by VALUE, should have
char *operator_name, char *operand_name)
{
struct type *type;
- int i;
+ int found;
/* Follow pointers until we reach a non-pointer. These aren't the C
semantics, but they're what the normal GDB evaluator does, so we
should at least be consistent. */
- while (TYPE_CODE (value->type) == TYPE_CODE_PTR)
+ while (pointer_type (value->type))
{
require_rvalue (ax, value);
gen_deref (ax, value);
if (value->kind != axs_lvalue_memory)
error (_("Structure does not live in memory."));
- i = find_field (type, field);
+ /* Search through fields and base classes recursively. */
+ found = gen_struct_ref_recursive (exp, ax, value, field, 0, type);
+
+ if (!found)
+ error (_("Couldn't find member named `%s' in struct/union/class `%s'"),
+ field, TYPE_TAG_NAME (type));
+}
- /* Is this a bitfield? */
- if (TYPE_FIELD_PACKED (type, i))
- gen_bitfield_ref (exp, ax, value, TYPE_FIELD_TYPE (type, i),
- TYPE_FIELD_BITPOS (type, i),
- (TYPE_FIELD_BITPOS (type, i)
- + TYPE_FIELD_BITSIZE (type, i)));
- else
+static int
+gen_namespace_elt (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ const struct type *curtype, char *name);
+static int
+gen_maybe_namespace_elt (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ const struct type *curtype, char *name);
+
+static void
+gen_static_field (struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value,
+ struct type *type, int fieldno)
+{
+ if (TYPE_FIELD_LOC_KIND (type, fieldno) == FIELD_LOC_KIND_PHYSADDR)
{
- gen_offset (ax, TYPE_FIELD_BITPOS (type, i) / TARGET_CHAR_BIT);
+ ax_const_l (ax, TYPE_FIELD_STATIC_PHYSADDR (type, fieldno));
value->kind = axs_lvalue_memory;
- value->type = TYPE_FIELD_TYPE (type, i);
+ value->type = TYPE_FIELD_TYPE (type, fieldno);
+ value->optimized_out = 0;
+ }
+ else
+ {
+ char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
+ struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0);
+
+ if (sym)
+ {
+ gen_var_ref (gdbarch, ax, value, sym);
+
+ /* Don't error if the value was optimized out, we may be
+ scanning all static fields and just want to pass over this
+ and continue with the rest. */
+ }
+ else
+ {
+ /* Silently assume this was optimized out; class printing
+ will let the user know why the data is missing. */
+ value->optimized_out = 1;
+ }
}
}
+static int
+gen_struct_elt_for_reference (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ struct type *type, char *fieldname)
+{
+ struct type *t = type;
+ int i;
+ struct value *v, *result;
+
+ if (TYPE_CODE (t) != TYPE_CODE_STRUCT
+ && TYPE_CODE (t) != TYPE_CODE_UNION)
+ internal_error (__FILE__, __LINE__,
+ _("non-aggregate type to gen_struct_elt_for_reference"));
+
+ for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--)
+ {
+ char *t_field_name = TYPE_FIELD_NAME (t, i);
+
+ if (t_field_name && strcmp (t_field_name, fieldname) == 0)
+ {
+ if (field_is_static (&TYPE_FIELD (t, i)))
+ {
+ gen_static_field (exp->gdbarch, ax, value, t, i);
+ if (value->optimized_out)
+ error (_("static field `%s' has been optimized out, cannot use"),
+ fieldname);
+ return 1;
+ }
+ if (TYPE_FIELD_PACKED (t, i))
+ error (_("pointers to bitfield members not allowed"));
+
+ /* FIXME we need a way to do "want_address" equivalent */
+
+ error (_("Cannot reference non-static field \"%s\""), fieldname);
+ }
+ }
+
+ /* FIXME add other scoped-reference cases here */
+
+ /* Do a last-ditch lookup. */
+ return gen_maybe_namespace_elt (exp, ax, value, type, fieldname);
+}
+
+/* C++: Return the member NAME of the namespace given by the type
+ CURTYPE. */
+
+static int
+gen_namespace_elt (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ const struct type *curtype, char *name)
+{
+ int found = gen_maybe_namespace_elt (exp, ax, value, curtype, name);
+
+ if (!found)
+ error (_("No symbol \"%s\" in namespace \"%s\"."),
+ name, TYPE_TAG_NAME (curtype));
+
+ return found;
+}
+
+/* A helper function used by value_namespace_elt and
+ value_struct_elt_for_reference. It looks up NAME inside the
+ context CURTYPE; this works if CURTYPE is a namespace or if CURTYPE
+ is a class and NAME refers to a type in CURTYPE itself (as opposed
+ to, say, some base class of CURTYPE). */
+
+static int
+gen_maybe_namespace_elt (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ const struct type *curtype, char *name)
+{
+ const char *namespace_name = TYPE_TAG_NAME (curtype);
+ struct symbol *sym;
+
+ sym = cp_lookup_symbol_namespace (namespace_name, name,
+ block_for_pc (ax->scope),
+ VAR_DOMAIN);
+
+ if (sym == NULL)
+ return 0;
+
+ gen_var_ref (exp->gdbarch, ax, value, sym);
+
+ if (value->optimized_out)
+ error (_("`%s' has been optimized out, cannot use"),
+ SYMBOL_PRINT_NAME (sym));
+
+ return 1;
+}
+
+
+static int
+gen_aggregate_elt_ref (struct expression *exp,
+ struct agent_expr *ax, struct axs_value *value,
+ struct type *type, char *field,
+ char *operator_name, char *operand_name)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ return gen_struct_elt_for_reference (exp, ax, value, type, field);
+ break;
+ case TYPE_CODE_NAMESPACE:
+ return gen_namespace_elt (exp, ax, value, type, field);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("non-aggregate type in gen_aggregate_elt_ref"));
+ }
+
+ return 0;
+}
/* Generate code for GDB's magical `repeat' operator.
LVALUE @ INT creates an array INT elements long, and whose elements
struct agent_expr *ax, struct axs_value *value)
{
/* Used to hold the descriptions of operand expressions. */
- struct axs_value value1, value2;
- enum exp_opcode op = (*pc)[0].opcode;
+ struct axs_value value1, value2, value3;
+ enum exp_opcode op = (*pc)[0].opcode, op2;
+ int if1, go1, if2, go2, end;
+ struct type *int_type = builtin_type (exp->gdbarch)->builtin_int;
/* If we're looking at a constant expression, just push its value. */
{
case BINOP_MUL:
case BINOP_DIV:
case BINOP_REM:
+ case BINOP_LSH:
+ case BINOP_RSH:
case BINOP_SUBSCRIPT:
case BINOP_BITWISE_AND:
case BINOP_BITWISE_IOR:
(*pc)++;
gen_expr (exp, pc, ax, &value1);
gen_usual_unary (exp, ax, &value1);
+ gen_expr_binop_rest (exp, op, pc, ax, value, &value1, &value2);
+ break;
+
+ case BINOP_LOGICAL_AND:
+ (*pc)++;
+ /* Generate the obvious sequence of tests and jumps. */
+ gen_expr (exp, pc, ax, &value1);
+ gen_usual_unary (exp, ax, &value1);
+ if1 = ax_goto (ax, aop_if_goto);
+ go1 = ax_goto (ax, aop_goto);
+ ax_label (ax, if1, ax->len);
gen_expr (exp, pc, ax, &value2);
gen_usual_unary (exp, ax, &value2);
- gen_usual_arithmetic (exp, ax, &value1, &value2);
- switch (op)
+ if2 = ax_goto (ax, aop_if_goto);
+ go2 = ax_goto (ax, aop_goto);
+ ax_label (ax, if2, ax->len);
+ ax_const_l (ax, 1);
+ end = ax_goto (ax, aop_goto);
+ ax_label (ax, go1, ax->len);
+ ax_label (ax, go2, ax->len);
+ ax_const_l (ax, 0);
+ ax_label (ax, end, ax->len);
+ value->kind = axs_rvalue;
+ value->type = int_type;
+ break;
+
+ case BINOP_LOGICAL_OR:
+ (*pc)++;
+ /* Generate the obvious sequence of tests and jumps. */
+ gen_expr (exp, pc, ax, &value1);
+ gen_usual_unary (exp, ax, &value1);
+ if1 = ax_goto (ax, aop_if_goto);
+ gen_expr (exp, pc, ax, &value2);
+ gen_usual_unary (exp, ax, &value2);
+ if2 = ax_goto (ax, aop_if_goto);
+ ax_const_l (ax, 0);
+ end = ax_goto (ax, aop_goto);
+ ax_label (ax, if1, ax->len);
+ ax_label (ax, if2, ax->len);
+ ax_const_l (ax, 1);
+ ax_label (ax, end, ax->len);
+ value->kind = axs_rvalue;
+ value->type = int_type;
+ break;
+
+ case TERNOP_COND:
+ (*pc)++;
+ gen_expr (exp, pc, ax, &value1);
+ gen_usual_unary (exp, ax, &value1);
+ /* For (A ? B : C), it's easiest to generate subexpression
+ bytecodes in order, but if_goto jumps on true, so we invert
+ the sense of A. Then we can do B by dropping through, and
+ jump to do C. */
+ gen_logical_not (ax, &value1, int_type);
+ if1 = ax_goto (ax, aop_if_goto);
+ gen_expr (exp, pc, ax, &value2);
+ gen_usual_unary (exp, ax, &value2);
+ end = ax_goto (ax, aop_goto);
+ ax_label (ax, if1, ax->len);
+ gen_expr (exp, pc, ax, &value3);
+ gen_usual_unary (exp, ax, &value3);
+ ax_label (ax, end, ax->len);
+ /* This is arbitary - what if B and C are incompatible types? */
+ value->type = value2.type;
+ value->kind = value2.kind;
+ break;
+
+ case BINOP_ASSIGN:
+ (*pc)++;
+ if ((*pc)[0].opcode == OP_INTERNALVAR)
{
- case BINOP_ADD:
- if (TYPE_CODE (value1.type) == TYPE_CODE_INT
- && TYPE_CODE (value2.type) == TYPE_CODE_PTR)
+ char *name = internalvar_name ((*pc)[1].internalvar);
+ struct trace_state_variable *tsv;
+ (*pc) += 3;
+ gen_expr (exp, pc, ax, value);
+ tsv = find_trace_state_variable (name);
+ if (tsv)
{
- /* Swap the values and proceed normally. */
- ax_simple (ax, aop_swap);
- gen_ptradd (ax, value, &value2, &value1);
+ ax_tsv (ax, aop_setv, tsv->number);
+ if (trace_kludge)
+ ax_tsv (ax, aop_tracev, tsv->number);
}
- else if (TYPE_CODE (value1.type) == TYPE_CODE_PTR
- && TYPE_CODE (value2.type) == TYPE_CODE_INT)
- gen_ptradd (ax, value, &value1, &value2);
- else
- gen_binop (ax, value, &value1, &value2,
- aop_add, aop_add, 1, "addition");
- break;
- case BINOP_SUB:
- if (TYPE_CODE (value1.type) == TYPE_CODE_PTR
- && TYPE_CODE (value2.type) == TYPE_CODE_INT)
- gen_ptrsub (ax,value, &value1, &value2);
- else if (TYPE_CODE (value1.type) == TYPE_CODE_PTR
- && TYPE_CODE (value2.type) == TYPE_CODE_PTR)
- /* FIXME --- result type should be ptrdiff_t */
- gen_ptrdiff (ax, value, &value1, &value2,
- builtin_type (exp->gdbarch)->builtin_long);
else
- gen_binop (ax, value, &value1, &value2,
- aop_sub, aop_sub, 1, "subtraction");
- break;
- case BINOP_MUL:
- gen_binop (ax, value, &value1, &value2,
- aop_mul, aop_mul, 1, "multiplication");
- break;
- case BINOP_DIV:
- gen_binop (ax, value, &value1, &value2,
- aop_div_signed, aop_div_unsigned, 1, "division");
- break;
- case BINOP_REM:
- gen_binop (ax, value, &value1, &value2,
- aop_rem_signed, aop_rem_unsigned, 1, "remainder");
- break;
- case BINOP_SUBSCRIPT:
- gen_ptradd (ax, value, &value1, &value2);
- if (TYPE_CODE (value->type) != TYPE_CODE_PTR)
- error (_("Invalid combination of types in array subscripting."));
- gen_deref (ax, value);
- break;
- case BINOP_BITWISE_AND:
- gen_binop (ax, value, &value1, &value2,
- aop_bit_and, aop_bit_and, 0, "bitwise and");
- break;
-
- case BINOP_BITWISE_IOR:
- gen_binop (ax, value, &value1, &value2,
- aop_bit_or, aop_bit_or, 0, "bitwise or");
- break;
-
- case BINOP_BITWISE_XOR:
- gen_binop (ax, value, &value1, &value2,
- aop_bit_xor, aop_bit_xor, 0, "bitwise exclusive-or");
- break;
-
- case BINOP_EQUAL:
- gen_binop (ax, value, &value1, &value2,
- aop_equal, aop_equal, 0, "equal");
- break;
-
- case BINOP_NOTEQUAL:
- gen_binop (ax, value, &value1, &value2,
- aop_equal, aop_equal, 0, "equal");
- gen_logical_not (ax, value,
- language_bool_type (exp->language_defn,
- exp->gdbarch));
- break;
-
- case BINOP_LESS:
- gen_binop (ax, value, &value1, &value2,
- aop_less_signed, aop_less_unsigned, 0, "less than");
- break;
-
- case BINOP_GTR:
- ax_simple (ax, aop_swap);
- gen_binop (ax, value, &value1, &value2,
- aop_less_signed, aop_less_unsigned, 0, "less than");
- break;
-
- case BINOP_LEQ:
- ax_simple (ax, aop_swap);
- gen_binop (ax, value, &value1, &value2,
- aop_less_signed, aop_less_unsigned, 0, "less than");
- gen_logical_not (ax, value,
- language_bool_type (exp->language_defn,
- exp->gdbarch));
- break;
-
- case BINOP_GEQ:
- gen_binop (ax, value, &value1, &value2,
- aop_less_signed, aop_less_unsigned, 0, "less than");
- gen_logical_not (ax, value,
- language_bool_type (exp->language_defn,
- exp->gdbarch));
- break;
+ error (_("$%s is not a trace state variable, may not assign to it"), name);
+ }
+ else
+ error (_("May only assign to trace state variables"));
+ break;
- default:
- /* We should only list operators in the outer case statement
- that we actually handle in the inner case statement. */
- internal_error (__FILE__, __LINE__,
- _("gen_expr: op case sets don't match"));
+ case BINOP_ASSIGN_MODIFY:
+ (*pc)++;
+ op2 = (*pc)[0].opcode;
+ (*pc)++;
+ (*pc)++;
+ if ((*pc)[0].opcode == OP_INTERNALVAR)
+ {
+ char *name = internalvar_name ((*pc)[1].internalvar);
+ struct trace_state_variable *tsv;
+ (*pc) += 3;
+ tsv = find_trace_state_variable (name);
+ if (tsv)
+ {
+ /* The tsv will be the left half of the binary operation. */
+ ax_tsv (ax, aop_getv, tsv->number);
+ if (trace_kludge)
+ ax_tsv (ax, aop_tracev, tsv->number);
+ /* Trace state variables are always 64-bit integers. */
+ value1.kind = axs_rvalue;
+ value1.type = builtin_type (exp->gdbarch)->builtin_long_long;
+ /* Now do right half of expression. */
+ gen_expr_binop_rest (exp, op2, pc, ax, value, &value1, &value2);
+ /* We have a result of the binary op, set the tsv. */
+ ax_tsv (ax, aop_setv, tsv->number);
+ if (trace_kludge)
+ ax_tsv (ax, aop_tracev, tsv->number);
+ }
+ else
+ error (_("$%s is not a trace state variable, may not assign to it"), name);
}
+ else
+ error (_("May only assign to trace state variables"));
break;
/* Note that we need to be a little subtle about generating code
/* Don't just dispose of the left operand. We might be tracing,
in which case we want to emit code to trace it if it's an
lvalue. */
- gen_traced_pop (ax, &value1);
+ gen_traced_pop (exp->gdbarch, ax, &value1);
gen_expr (exp, pc, ax, value);
/* It's the consumer's responsibility to trace the right operand. */
break;
case OP_VAR_VALUE:
gen_var_ref (exp->gdbarch, ax, value, (*pc)[2].symbol);
+
+ if (value->optimized_out)
+ error (_("`%s' has been optimized out, cannot use"),
+ SYMBOL_PRINT_NAME ((*pc)[2].symbol));
+
(*pc) += 4;
break;
break;
case OP_INTERNALVAR:
- error (_("GDB agent expressions cannot use convenience variables."));
+ {
+ const char *name = internalvar_name ((*pc)[1].internalvar);
+ struct trace_state_variable *tsv;
+ (*pc) += 3;
+ tsv = find_trace_state_variable (name);
+ if (tsv)
+ {
+ ax_tsv (ax, aop_getv, tsv->number);
+ if (trace_kludge)
+ ax_tsv (ax, aop_tracev, tsv->number);
+ /* Trace state variables are always 64-bit integers. */
+ value->kind = axs_rvalue;
+ 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);
+ }
+ break;
/* Weirdo operator: see comments for gen_repeat for details. */
case BINOP_REPEAT:
(*pc)++;
gen_expr (exp, pc, ax, value);
gen_usual_unary (exp, ax, value);
- gen_logical_not (ax, value,
- language_bool_type (exp->language_defn, exp->gdbarch));
+ gen_logical_not (ax, value, int_type);
break;
case UNOP_COMPLEMENT:
(*pc)++;
gen_expr (exp, pc, ax, value);
gen_usual_unary (exp, ax, value);
- if (TYPE_CODE (value->type) != TYPE_CODE_PTR)
+ if (!pointer_type (value->type))
error (_("Argument of unary `*' is not a pointer."));
gen_deref (ax, value);
break;
}
break;
+ case OP_THIS:
+ {
+ char *this_name;
+ struct symbol *func, *sym;
+ struct block *b;
+
+ 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);
+
+ /* 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);
+ if (!sym)
+ error (_("no `%s' found"), this_name);
+
+ gen_var_ref (exp->gdbarch, ax, value, sym);
+
+ if (value->optimized_out)
+ error (_("`%s' has been optimized out, cannot use"),
+ SYMBOL_PRINT_NAME (sym));
+
+ (*pc) += 2;
+ }
+ break;
+
+ case OP_SCOPE:
+ {
+ struct type *type = (*pc)[1].type;
+ int length = longest_to_int ((*pc)[2].longconst);
+ char *name = &(*pc)[3].string;
+ int found;
+
+ found = gen_aggregate_elt_ref (exp, ax, value, type, name,
+ "?", "??");
+ if (!found)
+ error (_("There is no field named %s"), name);
+ (*pc) += 5 + BYTES_TO_EXP_ELEM (length + 1);
+ }
+ break;
+
case OP_TYPE:
error (_("Attempt to use a type name as an expression."));
default:
- error (_("Unsupported operator in expression."));
+ error (_("Unsupported operator %s (%d) in expression."),
+ op_string (op), op);
+ }
+}
+
+/* This handles the middle-to-right-side of code generation for binary
+ expressions, which is shared between regular binary operations and
+ assign-modify (+= and friends) expressions. */
+
+static void
+gen_expr_binop_rest (struct expression *exp,
+ enum exp_opcode op, union exp_element **pc,
+ struct agent_expr *ax, struct axs_value *value,
+ struct axs_value *value1, struct axs_value *value2)
+{
+ struct type *int_type = builtin_type (exp->gdbarch)->builtin_int;
+
+ gen_expr (exp, pc, ax, value2);
+ gen_usual_unary (exp, ax, value2);
+ gen_usual_arithmetic (exp, ax, value1, value2);
+ switch (op)
+ {
+ case BINOP_ADD:
+ if (TYPE_CODE (value1->type) == TYPE_CODE_INT
+ && pointer_type (value2->type))
+ {
+ /* Swap the values and proceed normally. */
+ ax_simple (ax, aop_swap);
+ gen_ptradd (ax, value, value2, value1);
+ }
+ else if (pointer_type (value1->type)
+ && TYPE_CODE (value2->type) == TYPE_CODE_INT)
+ gen_ptradd (ax, value, value1, value2);
+ else
+ gen_binop (ax, value, value1, value2,
+ aop_add, aop_add, 1, "addition");
+ break;
+ case BINOP_SUB:
+ if (pointer_type (value1->type)
+ && TYPE_CODE (value2->type) == TYPE_CODE_INT)
+ gen_ptrsub (ax,value, value1, value2);
+ else if (pointer_type (value1->type)
+ && pointer_type (value2->type))
+ /* FIXME --- result type should be ptrdiff_t */
+ gen_ptrdiff (ax, value, value1, value2,
+ builtin_type (exp->gdbarch)->builtin_long);
+ else
+ gen_binop (ax, value, value1, value2,
+ aop_sub, aop_sub, 1, "subtraction");
+ break;
+ case BINOP_MUL:
+ gen_binop (ax, value, value1, value2,
+ aop_mul, aop_mul, 1, "multiplication");
+ break;
+ case BINOP_DIV:
+ gen_binop (ax, value, value1, value2,
+ aop_div_signed, aop_div_unsigned, 1, "division");
+ break;
+ case BINOP_REM:
+ gen_binop (ax, value, value1, value2,
+ aop_rem_signed, aop_rem_unsigned, 1, "remainder");
+ break;
+ case BINOP_LSH:
+ gen_binop (ax, value, value1, value2,
+ aop_lsh, aop_lsh, 1, "left shift");
+ break;
+ case BINOP_RSH:
+ gen_binop (ax, value, value1, value2,
+ aop_rsh_signed, aop_rsh_unsigned, 1, "right shift");
+ break;
+ case BINOP_SUBSCRIPT:
+ {
+ struct type *type;
+
+ if (binop_types_user_defined_p (op, value1->type, value2->type))
+ {
+ error (_("\
+cannot subscript requested type: cannot call user defined functions"));
+ }
+ else
+ {
+ /* If the user attempts to subscript something that is not
+ an array or pointer type (like a plain int variable for
+ example), then report this as an error. */
+ type = check_typedef (value1->type);
+ if (TYPE_CODE (type) != TYPE_CODE_ARRAY
+ && TYPE_CODE (type) != TYPE_CODE_PTR)
+ {
+ if (TYPE_NAME (type))
+ error (_("cannot subscript something of type `%s'"),
+ TYPE_NAME (type));
+ else
+ error (_("cannot subscript requested type"));
+ }
+ }
+
+ if (!is_integral_type (value2->type))
+ error (_("Argument to arithmetic operation not a number or boolean."));
+
+ gen_ptradd (ax, value, value1, value2);
+ gen_deref (ax, value);
+ break;
+ }
+ case BINOP_BITWISE_AND:
+ gen_binop (ax, value, value1, value2,
+ aop_bit_and, aop_bit_and, 0, "bitwise and");
+ break;
+
+ case BINOP_BITWISE_IOR:
+ gen_binop (ax, value, value1, value2,
+ aop_bit_or, aop_bit_or, 0, "bitwise or");
+ break;
+
+ case BINOP_BITWISE_XOR:
+ gen_binop (ax, value, value1, value2,
+ aop_bit_xor, aop_bit_xor, 0, "bitwise exclusive-or");
+ break;
+
+ case BINOP_EQUAL:
+ gen_equal (ax, value, value1, value2, int_type);
+ break;
+
+ case BINOP_NOTEQUAL:
+ gen_equal (ax, value, value1, value2, int_type);
+ gen_logical_not (ax, value, int_type);
+ break;
+
+ case BINOP_LESS:
+ gen_less (ax, value, value1, value2, int_type);
+ break;
+
+ case BINOP_GTR:
+ ax_simple (ax, aop_swap);
+ gen_less (ax, value, value1, value2, int_type);
+ break;
+
+ case BINOP_LEQ:
+ ax_simple (ax, aop_swap);
+ gen_less (ax, value, value1, value2, int_type);
+ gen_logical_not (ax, value, int_type);
+ break;
+
+ case BINOP_GEQ:
+ gen_less (ax, value, value1, value2, int_type);
+ gen_logical_not (ax, value, int_type);
+ break;
+
+ default:
+ /* We should only list operators in the outer case statement
+ that we actually handle in the inner case statement. */
+ internal_error (__FILE__, __LINE__,
+ _("gen_expr: op case sets don't match"));
}
}
\f
name comes from a list of local variables of a function. */
struct agent_expr *
-gen_trace_for_var (CORE_ADDR scope, struct symbol *var)
+gen_trace_for_var (CORE_ADDR scope, struct gdbarch *gdbarch,
+ struct symbol *var)
{
struct cleanup *old_chain = 0;
struct agent_expr *ax = new_agent_expr (scope);
old_chain = make_cleanup_free_agent_expr (ax);
trace_kludge = 1;
- gen_var_ref (NULL, ax, &value, var);
+ gen_var_ref (gdbarch, ax, &value, var);
+
+ /* If there is no actual variable to trace, flag it by returning
+ an empty agent expression. */
+ if (value.optimized_out)
+ {
+ do_cleanups (old_chain);
+ return NULL;
+ }
/* Make sure we record the final object, and get rid of it. */
- gen_traced_pop (ax, &value);
+ gen_traced_pop (gdbarch, ax, &value);
/* Oh, and terminate. */
ax_simple (ax, aop_end);
gen_expr (expr, &pc, ax, &value);
/* Make sure we record the final object, and get rid of it. */
- gen_traced_pop (ax, &value);
+ gen_traced_pop (expr->gdbarch, ax, &value);
/* Oh, and terminate. */
ax_simple (ax, aop_end);
projects / deliverable / binutils-gdb.git / blobdiff