[Qemu-devel] [RFC][PATCH v2 0/4] trace-gen: support for trace points in code-generation routines

[Lluís]

XXX: Must be applied on top of the 'trace-instrument' patch series

Adds a new optional keyword ("gen") to the syntax in "trace-events". When
specified, this event property will generate an extra set of functions that
provide the ability to inject trace points into TCG-generated code. Note that
the regular backend-dependant functions will also be generated.

The extra files generated, and their functions are:

- trace-helper.h
  Declares a 'trace_proxy_##name' TCG helper for each affected trace event.

- trace-helper.c
  Defines a 'trace_proxy_##name' TCG helper for each affected trace event, which
  simply calls 'trace_##name'.
  Note that this scheme neatly blends with the "instrument" property.

- trace-gen.h
  Defines a 'trace_gen_##name##_backend' function for each affected trace event,
  which handles all the (de)allocation of TCG temporaries and calls
  'gen_helper_trace_proxy_##name'.
  If the "instrument" property is not present, 'trace_gen_##name' is defined as
  an alias.
  This file is instended to be included instead of "trace.h" for generating TCG
  calls to trace points.

In order to fully exploit the information available during TCG code generation,
trace events with the "gen" property can also use TCG data types (e.g.,
TCG_ptr), which are gracefully handled by 'tracetool' when generating the
"trace.h" and "trace.c" files.

v2:

Rebase onto latest QEMU version (d33ea50a958b2e050d2b28e5f17e3b55e91c6d74).

Handle trace events with an explicit "void" to indicate no arguments.


TODO:

 * Check handling of TCGv_tl and target_long/target_ulong
 * Should not emit code in 'trace_gen_##name' if event has property "disable"
   (relates to previous' series comment on "disable" vs "simple").
 * Check per-cpu event tracing state before calling
   'gen_helper_trace_proxy_##name' (upcoming series)

Signed-off-by: Lluís Vilanova <address@hidden>
---

Lluís Vilanova (4):
      trace-gen: gracefully handle TCG types in "trace-events"
      trace-gen: auto-generate TCG helper routines for tracing
      trace-gen: [all] include "trace-helper.h" on all "helper.h" files
      trace-gen: auto-generate wrappers to call TCG trace helpers


 .gitignore                 |    2 
 Makefile                   |   21 ++
 Makefile.target            |    5 -
 configure                  |    5 +
 simpletrace.py             |    2 
 target-alpha/helper.h      |    2 
 target-arm/helper.h        |    2 
 target-cris/helper.h       |    2 
 target-i386/helper.h       |    2 
 target-m68k/helper.h       |    2 
 target-microblaze/helper.h |    2 
 target-mips/helper.h       |    2 
 target-ppc/helper.h        |    2 
 target-sh4/helper.h        |    2 
 target-sparc/helper.h      |    2 
 trace-events               |    8 +
 tracetool                  |  378 +++++++++++++++++++++++++++++++++++++++++++-
 17 files changed, 430 insertions(+), 11 deletions(-)