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* ax-general.c (aop_map): Add pick and rot.
	* dwarf2loc.c (compile_dwarf_to_ax) <DW_OP_over>: Reimplement.
	<DW_OP_rot>: Implement.
	* ax.h (enum agent_op) <aop_pick, aop_rot>: New constants.
	(ax_pick): Declare.
	* ax-general.c (ax_pick): New function.
doc
	* agentexpr.texi (Bytecode Descriptions): Document pick and rot.
gdbserver
	* tracepoint.c (enum gdb_agent_op) <gdb_agent_op_pick,
	gdb_agent_op_rot>: New constants.
	(gdb_agent_op_names): Add pick and roll.
	(eval_agent_expr) <gdb_agent_op_pick, gdb_agent_op_rot>: New
	cases.
This commit is contained in:
Tom Tromey 2011-02-18 20:55:45 +00:00
parent 66694b75a4
commit c7f96d2b95
8 changed files with 76 additions and 23 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2011-02-18 Tom Tromey <tromey@redhat.com>
* ax-general.c (aop_map): Add pick and rot.
* dwarf2loc.c (compile_dwarf_to_ax) <DW_OP_over>: Reimplement.
<DW_OP_rot>: Implement.
* ax.h (enum agent_op) <aop_pick, aop_rot>: New constants.
(ax_pick): Declare.
* ax-general.c (ax_pick): New function.
2011-02-18 Tom Tromey <tromey@redhat.com>
* Makefile.in (HFILES_NO_SRCDIR): Don't mention ada-operator.inc.

14
gdb/ax-general.c
View File

@ -143,6 +143,17 @@ ax_simple (struct agent_expr *x, enum agent_op op)
x->buf[x->len++] = op;
}
/* Append a pick operator to EXPR. DEPTH is the stack item to pick,
with 0 being top of stack. */
void
ax_pick (struct agent_expr *x, int depth)
{
if (depth < 0 || depth > 255)
error (_("GDB bug: ax-general.c (ax_pick): stack depth out of range"));
ax_simple (x, aop_pick);
append_const (x, 1, depth);
}
/* Append a sign-extension or zero-extension instruction to EXPR, to
extend an N-bit value. */
@ -376,6 +387,9 @@ struct aop_map aop_map[] =
{"tracev", 2, 0, 0, 1}, /* 0x2e */
{0, 0, 0, 0, 0}, /* 0x2f */
{"trace16", 2, 0, 1, 1}, /* 0x30 */
{0, 0, 0, 0, 0}, /* 0x31 */
{"pick", 1, 0, 0, 1}, /* 0x32 */
{"rot", 0, 0, 3, 3}, /* 0x33 */
};

6
gdb/ax.h
View File

@ -204,6 +204,8 @@ enum agent_op
aop_setv = 0x2d,
aop_tracev = 0x2e,
aop_trace16 = 0x30,
aop_pick = 0x32,
aop_rot = 0x33,
aop_last
};
@ -221,6 +223,10 @@ extern struct cleanup *make_cleanup_free_agent_expr (struct agent_expr *);
/* Append a simple operator OP to EXPR. */
extern void ax_simple (struct agent_expr *EXPR, enum agent_op OP);
/* Append a pick operator to EXPR. DEPTH is the stack item to pick,
with 0 being top of stack. */
extern void ax_pick (struct agent_expr *EXPR, int DEPTH);
/* Append the floating-point prefix, for the next bytecode. */
#define ax_float(EXPR) (ax_simple ((EXPR), aop_float))

4
gdb/doc/ChangeLog
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@ -1,3 +1,7 @@
2011-02-18 Tom Tromey <tromey@redhat.com>
* agentexpr.texi (Bytecode Descriptions): Document pick and rot.
2011-02-14 Michael Snyder <msnyder@vmware.com>
* gdb.texinfo (threads): Document argument for "info threads" cmd.

10
gdb/doc/agentexpr.texi
View File

@ -391,6 +391,16 @@ Exchange the top two items on the stack.
@item @code{pop} (0x29): @var{a} =>
Discard the top value on the stack.
@item @code{pick} (0x32) @var{n}: @var{a} @dots{} @var{b} => @var{a} @dots{} @var{b} @var{a}
Duplicate an item from the stack and push it on the top of the stack.
@var{n}, a single byte, indicates the stack item to copy. If @var{n}
is zero, this is the same as @code{dup}; if @var{n} is one, it copies
the item under the top item, etc. If @var{n} exceeds the number of
items on the stack, terminate with an error.
@item @code{rot} (0x33): @var{a} @var{b} @var{c} => @var{c} @var{b} @var{a}
Rotate the top three items on the stack.
@item @code{if_goto} (0x20) @var{offset}: @var{a} @result{}
Pop an integer off the stack; if it is non-zero, branch to the given
offset in the bytecode string. Otherwise, continue to the next

26
gdb/dwarf2loc.c
View File

@ -1740,7 +1740,7 @@ dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc,
case DW_OP_pick:
offset = *op_ptr++;
unimplemented (op);
ax_pick (expr, offset);
break;
case DW_OP_swap:
@ -1748,31 +1748,11 @@ dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc,
break;
case DW_OP_over:
/* We can't directly support DW_OP_over, but GCC emits it as
part of a sequence to implement signed modulus. As a
hack, we recognize this sequence. Note that if GCC ever
generates a branch to the middle of this sequence, then
we will die somehow. */
if (op_end - op_ptr >= 4
&& op_ptr[0] == DW_OP_over
&& op_ptr[1] == DW_OP_div
&& op_ptr[2] == DW_OP_mul
&& op_ptr[3] == DW_OP_minus)
{
/* Sign extend the operands. */
ax_ext (expr, addr_size_bits);
ax_simple (expr, aop_swap);
ax_ext (expr, addr_size_bits);
ax_simple (expr, aop_swap);
ax_simple (expr, aop_rem_signed);
op_ptr += 4;
}
else
unimplemented (op);
ax_pick (expr, 1);
break;
case DW_OP_rot:
unimplemented (op);
ax_simple (expr, aop_rot);
break;
case DW_OP_deref:

8
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,11 @@
2011-02-18 Tom Tromey <tromey@redhat.com>
* tracepoint.c (enum gdb_agent_op) <gdb_agent_op_pick,
gdb_agent_op_rot>: New constants.
(gdb_agent_op_names): Add pick and roll.
(eval_agent_expr) <gdb_agent_op_pick, gdb_agent_op_rot>: New
cases.
2011-02-15 Jan Kratochvil <jan.kratochvil@redhat.com>
* aclocal.m4: Regenerated with aclocal-1.11.1.

22
gdb/gdbserver/tracepoint.c
View File

@ -517,6 +517,8 @@ enum gdb_agent_op
gdb_agent_op_setv = 0x2d,
gdb_agent_op_tracev = 0x2e,
gdb_agent_op_trace16 = 0x30,
gdb_agent_op_pick = 0x32,
gdb_agent_op_rot = 0x33,
gdb_agent_op_last
};
@ -571,6 +573,9 @@ static const char *gdb_agent_op_names [gdb_agent_op_last] =
"tracev",
"?undef?",
"trace16",
"?undef?",
"pick",
"rot"
};
struct agent_expr
@ -4598,6 +4603,23 @@ eval_agent_expr (struct tracepoint_hit_ctx *ctx,
top = stack[sp];
break;
case gdb_agent_op_pick:
arg = aexpr->bytes[pc++];
stack[sp] = top;
top = stack[sp - arg];
++sp;
break;
case gdb_agent_op_rot:
{
ULONGEST tem = stack[sp - 1];
stack[sp - 1] = stack[sp - 2];
stack[sp - 2] = top;
top = tem;
}
break;
case gdb_agent_op_zero_ext:
arg = aexpr->bytes[pc++];
if (arg < (sizeof (LONGEST) * 8))