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2009-12-28 Stan Shebs <stan@codesourcery.com>

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Add trace state variables.
	* ax.h (enum agent_op): Add getv, setv, and tracev.
	(ax_tsv): Declare.
	* ax-gdb.c: Include tracepoint.h.
	(gen_expr): Handle BINOP_ASSIGN, BINOP_ASSIGN_MODIFY, and
	OP_INTERNALVAR.
	(gen_expr_binop_rest): New function, split from gen_expr.
	* ax-general.c (ax_tsv): New function.
	(aop_map): Add new bytecodes.
	* tracepoint.h (struct trace_state_variable): New struct.
	(tsv_s): New typedef.
	(find_trace_state_variable): Declare.
	* tracepoint.c (tvariables): New global.
	(next_tsv_number): New global.
	(create_trace_state_variable): New function.
	(find_trace_state_variable): New function.
	(delete_trace_state_variable): New function.
	(trace_variable_command): New function.
	(delete_trace_variable_command): New function.
	(tvariables_info): New function.
	(trace_start_command): Download tsvs with initial values.
	(_initialize_tracepoint): Add new commands.
	* NEWS: Mention the addition of trace state variables.

==> doc/ChangeLog <==
2009-12-28  Stan Shebs  <stan@codesourcery.com>

	* gdb.texinfo (Trace State Variables): New section.
	(Tracepoint Packets): Describe trace state variable packets.
	* agentexpr.texi (Bytecode Descriptions): Describe trace state
	variable bytecodes.

==> testsuite/ChangeLog <==
2009-12-28  Stan Shebs  <stan@codesourcery.com>

	* gdb.trace/tsv.exp: New file.
	* gdb.base/completion.exp: Update ambiguous info output.
This commit is contained in:
Stan Shebs
2009-12-28 23:39:10 +00:00
parent ae77ee9a7f
commit f61e138d9a
13 changed files with 792 additions and 120 deletions
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22
gdb/doc/agentexpr.texi
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@@ -440,6 +440,24 @@ alignment within the bytecode stream; thus, on machines where fetching a
16-bit on an unaligned address raises an exception, you should fetch the
register number one byte at a time.
@item @code{getv} (0x2c) @var{n}: @result{} @var{v}
Push the value of trace state variable number @var{n}, without sign
extension.
The variable number @var{n} is encoded as a 16-bit unsigned integer
immediately following the @code{getv} bytecode. It is always stored most
significant byte first, regardless of the target's normal endianness.
The variable number is not guaranteed to fall at any particular
alignment within the bytecode stream; thus, on machines where fetching a
16-bit on an unaligned address raises an exception, you should fetch the
register number one byte at a time.
@item @code{setv} (0x2d) @var{n}: @result{} @var{v}
Set trace state variable number @var{n} to the value found on the top
of the stack. The stack is unchanged, so that the value is readily
available if the assignment is part of a larger expression. The
handling of @var{n} is as described for @code{getv}.
@item @code{trace} (0x0c): @var{addr} @var{size} @result{}
Record the contents of the @var{size} bytes at @var{addr} in a trace
buffer, for later retrieval by GDB.
@@ -457,6 +475,10 @@ Identical to trace_quick, except that @var{size} is a 16-bit big-endian
unsigned integer, not a single byte. This should probably have been
named @code{trace_quick16}, for consistency.
@item @code{tracev} (0x2e) @var{n}: @result{} @var{a}
Record the value of trace state variable number @var{n} in the trace
buffer. The handling of @var{n} is as described for @code{getv}.
@item @code{end} (0x27): @result{}
Stop executing bytecode; the result should be the top element of the
stack. If the purpose of the expression was to compute an lvalue or a