[PATCH 15/16] gcc: Use libgas and libld within the driver
Richard Biener
richard.guenther@gmail.com
Tue Jun 2 08:40:00 GMT 2015
On Mon, Jun 1, 2015 at 11:04 PM, David Malcolm <dmalcolm@redhat.com> wrote:
> This patch adds the ability for gcc to be configured with:
> --with-embedded-as
> --with-embedded-ld
> If so, invocations of "as" and "ld" are detected in the gcc driver, and
> specialcased by invoking these in-process as shared libraries. This is
> intended for use by libgccjit, when the driver itself is in-process
> within libgccjit, eliminating fork/exec and dynamic-library resolution.
>
> Doing so dramatically speeds up jit.dg/test-benchmark.c.
>
> The patch generalizes the named items support within timevar.c, so that
> as well as having bucket of named "jit client items" we also have
> buckets for "as" and for "ld" so that they can account for time spent
> within them.
>
> One remaining hack here, appending CFLAGS-gcc.o with a hardcoded include
> path, but I didn't want that to hold up posting what I've got so far.
Hum, so why not go further and embed as into cc1/cc1plus, etc.? That is,
make the as invocation parts of the driver accessible to the compiler
in some way.
This way we can eventually add a more efficient way of funneling the compiler
assembler output to libas (well, I suppose you at least use -pipe...).
Richard.
> gcc/ChangeLog:
> * configure.ac: Add --with-embedded-as and --with-embedded-ld.
> * gcc.c: Include libgas.h and libld.h.
> (class ctimershim): New.
> (ctimershim::impl_push): New.
> (ctimershim::impl_pop): New.
> (run_embedded_as): New.
> (run_embedded_ld): New.
> (enum known_command): New.
> (get_known_command): New.
> (tv_id_for_known_command): New.
> (maybe_run_embedded_command): New.
> (execute): Invoke get_known_command and
> maybe_run_embedded_command, potentially avoiding the need to call
> into pex.
> * timevar.c (timer::named_items::print): Add "name" param rather
> than hardcoding "Client items".
> (timer::timer): Initialize "m_has_named_items"; replace
> "m_jit_client_items" with "m_named_items" array.
> (timer::~timer): Likewise.
> (timer::push_client_item): Rename to...
> (timer::push_named_item): ...this and add "dict" param,
> generalizing to support an array of dicts of named items.
> (timer::pop_client_item): Rename to...
> (timer::pop_named_item): ...this, generalizing to support
> an array of dicts of named items.
> (timer::print): Print JIT client items first (if any), then
> GCC timevar items, then embedded as items (if any), then embedded
> ld items (if any).
> * timevar.def (TV_DRIVER_EMBEDDED_AS): New.
> (TV_DRIVER_EMBEDDED_LD): New.
> * timevar.h (timer::item_dict): New enum.
> (timer::push_client_item): Rename to...
> (timer::push_named_item): ...this, adding "dict" param.
> (timer::pop_client_item): Rename to...
> (timer::pop_named_item): ...this, adding "dict" param.
> (timer::get_item_dict): New.
> (timer::m_jit_client_items): Drop this field in favor of...
> (timer::m_named_items): ...this array.
> (timer::m_has_named_items): New.
>
> gcc/jit/ChangeLog:
> * Make-lang.in (LIBGCCJIT_FILENAME): Add EXTRA_GCC_LIBS to link.
> * libgccjit.c (gcc_jit_timer_push): Replace call to
> timer->push_client_item with timer->push_named_item.
> (gcc_jit_timer_pop): Likewise for pop.
> * notes.txt: Indicate that as/ld could be embedded.
> ---
> gcc/Makefile.in | 3 +
> gcc/configure.ac | 25 ++++++
> gcc/gcc.c | 214 ++++++++++++++++++++++++++++++++++++++++++++++++---
> gcc/jit/Make-lang.in | 2 +-
> gcc/jit/libgccjit.c | 5 +-
> gcc/jit/notes.txt | 4 +-
> gcc/timevar.c | 56 ++++++++++----
> gcc/timevar.def | 2 +
> gcc/timevar.h | 33 +++++++-
> 9 files changed, 308 insertions(+), 36 deletions(-)
>
> diff --git a/gcc/Makefile.in b/gcc/Makefile.in
> index 2388975..9061933 100644
> --- a/gcc/Makefile.in
> +++ b/gcc/Makefile.in
> @@ -1993,6 +1993,9 @@ DRIVER_DEFINES = \
>
> CFLAGS-gcc.o += $(DRIVER_DEFINES)
>
> +# FIXME
> +CFLAGS-gcc.o += -I/home/david/coding/gcc-python/binutils-gdb-libraries/install/include
> +
> specs.h : s-specs ; @true
> s-specs : Makefile
> lsf="$(lang_specs_files)"; for f in $$lsf; do \
> diff --git a/gcc/configure.ac b/gcc/configure.ac
> index 810725c..6f50908 100644
> --- a/gcc/configure.ac
> +++ b/gcc/configure.ac
> @@ -1114,6 +1114,31 @@ LIBS=
> AC_SEARCH_LIBS(kstat_open, kstat)
> EXTRA_GCC_LIBS="$LIBS"
> LIBS="$save_LIBS"
> +
> +# Support embedding libgas in the driver
> +
> +AC_ARG_WITH([embedded-as],
> + [AS_HELP_STRING([--with-embedded-as],
> + [use libgas to embed the assembler in-process])],
> + [AC_CHECK_LIB([gas], [gas_main],
> + [EXTRA_GCC_LIBS+=" -lgas $LDFLAGS";
> + AC_DEFINE(HAVE_LIBGAS, 1,
> + [Define if libgas is installed.])
> + ],
> + [AC_MSG_ERROR(["libgas not found"])])])
> +
> +# Support embedding libld in the driver
> +
> +AC_ARG_WITH([embedded-ld],
> + [AS_HELP_STRING([--with-embedded-ld],
> + [use libld to embed the linker in-process])],
> + [AC_CHECK_LIB([ld], [ld_main],
> + [EXTRA_GCC_LIBS+=" -lld $LDFLAGS";
> + AC_DEFINE(HAVE_LIBLD, 1,
> + [Define if libld is installed.])
> + ],
> + [AC_MSG_ERROR(["libld not found"])])])
> +
> AC_SUBST(EXTRA_GCC_LIBS)
>
> # Some systems put ldexp and frexp in libm instead of libc; assume
> diff --git a/gcc/gcc.c b/gcc/gcc.c
> index 93f41ec..ed92c7d 100644
> --- a/gcc/gcc.c
> +++ b/gcc/gcc.c
> @@ -45,6 +45,14 @@ compilation is specified by a string called a "spec". */
> #include "filenames.h"
> #include "timevar.h"
>
> +#ifdef HAVE_LIBGAS
> +#include "libgas.h"
> +#endif
> +
> +#ifdef HAVE_LIBLD
> +#include "libld.h"
> +#endif
> +
> /* Singleton instance of "driver" class. */
> static driver *g_driver;
>
> @@ -2807,6 +2815,190 @@ add_sysrooted_prefix (struct path_prefix *pprefix, const char *prefix,
> require_machine_suffix, os_multilib);
> }
>
> +
> +/* An implementation of the ctimer hooks C API, forwarding to
> + our C++ "timer" class, for a particular timer::item_dict. */
> +class ctimershim : public ctimer
> +{
> + public:
> + ctimershim (timer *t,
> + enum timer::item_dict dict)
> + : m_timer (t),
> + m_dict (dict)
> + {
> + this->push = impl_push;
> + this->pop = impl_pop;
> + }
> +
> + private:
> + static void impl_push (ctimer *that, const char *item_name);
> + static void impl_pop (ctimer *that);
> +
> + private:
> + timer *m_timer;
> + enum timer::item_dict m_dict;
> +};
> +
> +/* Implement CTIMER_PUSH in terms of pushing a named item
> + within the given item_dict. */
> +void
> +ctimershim::impl_push (ctimer *that, const char *item_name)
> +{
> + ctimershim *this_ = static_cast <ctimershim *> (that);
> + gcc_assert (this_->m_timer);
> + this_->m_timer->push_named_item (this_->m_dict, item_name);
> +}
> +
> +/* Implement CTIMER_POP in terms of popping the item
> + from the given item_dict. */
> +void
> +ctimershim::impl_pop (ctimer *that)
> +{
> + ctimershim *this_ = static_cast <ctimershim *> (that);
> + gcc_assert (this_->m_timer);
> + this_->m_timer->pop_named_item (this_->m_dict);
> +}
> +
> +#ifdef HAVE_LIBGAS
> +
> +/* Invoke gas_main, passing in the driver's timer
> + so that the gas code can record timing information into it. */
> +
> +static int run_embedded_as (int argc, const char **argv)
> +{
> + gcc_assert (g_driver);
> + timer *driver_timer = g_driver->get_timer ();
> + auto_timevar tv (driver_timer, TV_DRIVER_EMBEDDED_AS);
> + if (0)
> + {
> + fprintf (stderr, "run_embedded_as: %i args\n", argc);
> + for (int i = 0; i < argc; i++)
> + fprintf (stderr, " argv[%i]: %s\n", i, argv[i]);
> + }
> +
> + ctimershim ct (driver_timer, timer::ITEM_DICT_EMBEDDED_AS);
> + return gas_main (argc,
> + argv,
> + 0, /* "standalone" */
> + driver_timer ? &ct : NULL); /* "timer" */
> +}
> +
> +#endif /* #ifdef HAVE_LIBGAS */
> +
> +#ifdef HAVE_LIBLD
> +
> +/* Invoke ld_main, passing in the driver's timer
> + so that the linker code can record timing information into it. */
> +
> +static int run_embedded_ld (int argc, const char **argv)
> +{
> + gcc_assert (g_driver);
> + timer *driver_timer = g_driver->get_timer ();
> + auto_timevar tv (driver_timer, TV_DRIVER_EMBEDDED_LD);
> + if (0)
> + {
> + fprintf (stderr, "run_embedded_ld: %i args\n", argc);
> + for (int i = 0; i < argc; i++)
> + fprintf (stderr, " argv[%i]: %s\n", i, argv[i]);
> + }
> +
> + ctimershim ct (driver_timer, timer::ITEM_DICT_EMBEDDED_LD);
> + return ld_main (argc,
> + argv,
> + 0, /* "standalone" */
> + driver_timer ? &ct : NULL); /* struct ctimer * */
> +}
> +
> +#endif /* #ifdef HAVE_LIBLD */
> +
> +/* The result of get_known_command. */
> +
> +enum known_command
> +{
> + KNOWN_COMMAND_AS,
> + KNOWN_COMMAND_COLLECT2,
> + KNOWN_COMMAND_LD,
> + KNOWN_COMMAND_OTHER, /* not a known command, or a pipeline. */
> + NUM_KNOWN_COMMANDS
> +};
> +
> +/* Do we have an invocation of a single, known command, with no pipes?
> + We can use this for selecting a timevar_id_t for the pex invocation,
> + and potentially for running the command in-process. */
> +
> +static enum known_command
> +get_known_command (int n_commands, const char *argv0)
> +{
> + if (n_commands == 1)
> + {
> + if (0 == strcmp (argv0, "as"))
> + return KNOWN_COMMAND_AS;
> + else if (0 == strcmp (argv0, "collect2"))
> + return KNOWN_COMMAND_COLLECT2;
> + else if (0 == strcmp (argv0, "ld"))
> + return KNOWN_COMMAND_LD;
> + }
> + return KNOWN_COMMAND_OTHER;
> +}
> +
> +/* If we're timing things, and we have a single command in the
> + pipeline, bill the time to that command. Given that we
> + need a timevar for each one, we only split out a few important
> + commands. */
> +
> +const timevar_id_t tv_id_for_known_command[NUM_KNOWN_COMMANDS] = {
> + TV_DRIVER_EXECUTE_AS,
> + TV_DRIVER_EXECUTE_COLLECT2,
> + TV_DRIVER_EXECUTE_LD,
> + TV_DRIVER_EXECUTE_OTHER
> +};
> +
> +/* Optimization: if we have a single, known command, and we're linked
> + against an embedded copy of it, call it directly in-process, avoiding
> + the overhead of fork/exec/dynamic link.
> +
> + Return true if an embedded command was run, writing the result to
> + *RESULT_OUT.
> + Return false if no embedded command was available, leading *result_out
> + untouched. */
> +
> +static bool
> +maybe_run_embedded_command (enum known_command known_command,
> + int *result_out ATTRIBUTE_UNUSED)
> +{
> +#if defined (HAVE_LIBGAS) || defined (HAVE_LIBLD)
> + int argc = argbuf.length ();
> + const char **argv = argbuf.address ();
> +#endif
> +
> + switch (known_command)
> + {
> + case KNOWN_COMMAND_AS:
> +#ifdef HAVE_LIBGAS
> + *result_out = run_embedded_as (argc, argv);
> + return true;
> +#else
> + return false;
> +#endif
> +
> + case KNOWN_COMMAND_COLLECT2:
> + return false;
> +
> + case KNOWN_COMMAND_LD:
> +#ifdef HAVE_LIBLD
> + *result_out = run_embedded_ld (argc, argv);
> + return true;
> +#else
> + return false;
> +#endif
> +
> + default:
> + gcc_unreachable ();
> + case KNOWN_COMMAND_OTHER:
> + return false;
> + }
> +}
> +
> /* Execute the command specified by the arguments on the current line of spec.
> When using pipes, this includes several piped-together commands
> with `|' between them.
> @@ -2845,23 +3037,23 @@ execute (void)
> if (strcmp (arg, "|") == 0)
> n_commands++;
>
> + /* Determine if we're dealing with a single embeddable command. */
> + enum known_command known_command = get_known_command (n_commands,
> + argbuf[0]);
> +
> + /* Optimization: potentially avoid fork/exec by calling the command
> + as a function in-process. */
> + int result;
> + if (maybe_run_embedded_command (known_command, &result))
> + return result;
> +
> /* If we're timing things, and we have a single command in the
> pipeline, bill the time to that command. Given that we
> need a timevar for each one, we only split out a few important
> commands. */
> - timevar_id_t tv_id;
> - tv_id = TV_DRIVER_EXECUTE_OTHER;
> gcc_assert (g_driver);
> timer *driver_timer = g_driver->get_timer ();
> - if (driver_timer && n_commands == 1)
> - {
> - if (0 == strcmp (argbuf[0], "as"))
> - tv_id = TV_DRIVER_EXECUTE_AS;
> - else if (0 == strcmp (argbuf[0], "collect2"))
> - tv_id = TV_DRIVER_EXECUTE_COLLECT2;
> - else if (0 == strcmp (argbuf[0], "ld"))
> - tv_id = TV_DRIVER_EXECUTE_LD;
> - }
> + timevar_id_t tv_id = tv_id_for_known_command[known_command];
> auto_timevar tv (driver_timer, tv_id);
>
> /* Get storage for each command. */
> diff --git a/gcc/jit/Make-lang.in b/gcc/jit/Make-lang.in
> index 9cff752..a7efe2e 100644
> --- a/gcc/jit/Make-lang.in
> +++ b/gcc/jit/Make-lang.in
> @@ -84,7 +84,7 @@ $(LIBGCCJIT_FILENAME): $(jit_OBJS) \
> +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ -shared \
> $(jit_OBJS) libbackend.a libcommon-target.a libcommon.a \
> $(CPPLIB) $(LIBDECNUMBER) $(LIBS) $(BACKENDLIBS) \
> - $(EXTRA_GCC_OBJS) \
> + $(EXTRA_GCC_OBJS) $(EXTRA_GCC_LIBS) \
> -Wl,--version-script=$(srcdir)/jit/libgccjit.map \
> -Wl,-soname,$(LIBGCCJIT_SONAME)
>
> diff --git a/gcc/jit/libgccjit.c b/gcc/jit/libgccjit.c
> index 2a67ef7..8eee2da 100644
> --- a/gcc/jit/libgccjit.c
> +++ b/gcc/jit/libgccjit.c
> @@ -2431,7 +2431,8 @@ gcc_jit_timer_push (gcc_jit_timer *timer,
> {
> RETURN_IF_FAIL (timer, NULL, NULL, "NULL timer");
> RETURN_IF_FAIL (item_name, NULL, NULL, "NULL item_name");
> - timer->push_client_item (item_name);
> + timer->push_named_item (timer::ITEM_DICT_JIT_CLIENT_CODE,
> + item_name);
> }
>
> /* Pop the top item from the timing stack. */
> @@ -2441,7 +2442,7 @@ gcc_jit_timer_pop (gcc_jit_timer *timer)
> {
> RETURN_IF_FAIL (timer, NULL, NULL, "NULL timer");
> /* FIXME: mismatching item? */
> - timer->pop_client_item ();
> + timer->pop_named_item (timer::ITEM_DICT_JIT_CLIENT_CODE);
> }
>
> /* Print timing information to the given stream about activity since
> diff --git a/gcc/jit/notes.txt b/gcc/jit/notes.txt
> index 36e05cb..4469145 100644
> --- a/gcc/jit/notes.txt
> +++ b/gcc/jit/notes.txt
> @@ -81,8 +81,8 @@ Client Code . Generated . libgccjit.so
> . . --> Convert assembler to DSO, via embedded
> . . copy of driver:
> . . driver::main ()
> - . . invocation of "as"
> - . . invocation of "ld"
> + . . in-process libgas, or out-of-process invocation of "as"
> + . . in-process libld, or out-of-process invocation of "ld"
> . . driver::finalize ()
> . . <----
> . . │ . .
> diff --git a/gcc/timevar.c b/gcc/timevar.c
> index 9bc62e6..28db5b4 100644
> --- a/gcc/timevar.c
> +++ b/gcc/timevar.c
> @@ -134,7 +134,7 @@ class timer::named_items
>
> void push (const char *item_name);
> void pop ();
> - void print (FILE *fp, const timevar_time_def *total);
> + void print (FILE *fp, const char *name, const timevar_time_def *total);
>
> private:
> /* Which timer instance does this relate to? */
> @@ -197,11 +197,13 @@ timer::named_items::pop ()
> /* Print the given client item. Helper function for timer::print. */
>
> void
> -timer::named_items::print (FILE *fp, const timevar_time_def *total)
> +timer::named_items::print (FILE *fp,
> + const char *name,
> + const timevar_time_def *total)
> {
> unsigned int i;
> const char *item_name;
> - fprintf (fp, "Client items:\n");
> + fprintf (fp, "%s:\n", name);
> FOR_EACH_VEC_ELT (m_names, i, item_name)
> {
> timer::timevar_def *def = m_hash_map.get (item_name);
> @@ -260,11 +262,14 @@ timer::timer () :
> m_stack (NULL),
> m_unused_stack_instances (NULL),
> m_start_time (),
> - m_jit_client_items (NULL)
> + m_has_named_items (false)
> {
> /* Zero all elapsed times. */
> memset (m_timevars, 0, sizeof (m_timevars));
>
> + /* There are no named_timers yet. */
> + memset (m_named_items, 0, sizeof (m_named_items));
> +
> /* Initialize the names of timing variables. */
> #define DEFTIMEVAR(identifier__, name__) \
> m_timevars[identifier__].name = name__;
> @@ -298,7 +303,8 @@ timer::~timer ()
> free (iter);
> }
>
> - delete m_jit_client_items;
> + for (int i = 0; i < NUM_ITEM_DICTS; i++)
> + delete m_named_items[i];
> }
>
> /* Initialize timing variables. */
> @@ -544,24 +550,32 @@ timer::cond_stop (timevar_id_t timevar)
> /* Push the named item onto the timing stack. */
>
> void
> -timer::push_client_item (const char *item_name)
> +timer::push_named_item (enum item_dict dict,
> + const char *item_name)
> {
> + gcc_assert (dict < NUM_ITEM_DICTS);
> gcc_assert (item_name);
> -
> /* Lazily create the named_items instance. */
> - if (!m_jit_client_items)
> - m_jit_client_items = new named_items (this);
> + named_items **item_dict = &m_named_items[dict];
> + if (!*item_dict)
> + *item_dict = new named_items (this);
> + (*item_dict)->push (item_name);
>
> - m_jit_client_items->push (item_name);
> + m_has_named_items = true;
> }
>
> /* Pop the top-most client item from the timing stack. */
>
> void
> -timer::pop_client_item ()
> +timer::pop_named_item (enum item_dict dict)
> {
> - gcc_assert (m_jit_client_items);
> - m_jit_client_items->pop ();
> + gcc_assert (dict < NUM_ITEM_DICTS);
> + named_items *item_dict = m_named_items[dict];
> +
> + /* If this fails, we have a pop from something that was never pushed to. */
> + gcc_assert (item_dict);
> +
> + item_dict->pop ();
> }
>
> /* Validate that phase times are consistent. */
> @@ -687,7 +701,11 @@ timer::print (FILE *fp)
> m_start_time = now;
>
> fputs ("\nExecution times (seconds)\n", fp);
> - if (m_jit_client_items)
> + if (m_named_items[ITEM_DICT_JIT_CLIENT_CODE])
> + m_named_items[ITEM_DICT_JIT_CLIENT_CODE]->print (fp,
> + "Client items",
> + total);
> + if (m_has_named_items)
> fputs ("GCC items:\n", fp);
> for (id = 0; id < (unsigned int) TIMEVAR_LAST; ++id)
> {
> @@ -713,8 +731,14 @@ timer::print (FILE *fp)
>
> print_row (fp, total, tv);
> }
> - if (m_jit_client_items)
> - m_jit_client_items->print (fp, total);
> + if (m_named_items[ITEM_DICT_EMBEDDED_AS])
> + m_named_items[ITEM_DICT_EMBEDDED_AS]->print (fp,
> + "Embedded 'as'",
> + total);
> + if (m_named_items[ITEM_DICT_EMBEDDED_LD])
> + m_named_items[ITEM_DICT_EMBEDDED_LD]->print (fp,
> + "Embedded 'ld'",
> + total);
>
> /* Print total time. */
> fputs (" TOTAL :", fp);
> diff --git a/gcc/timevar.def b/gcc/timevar.def
> index ce9236d..2360b30 100644
> --- a/gcc/timevar.def
> +++ b/gcc/timevar.def
> @@ -292,8 +292,10 @@ DEFTIMEVAR (TV_DRIVER_SETUP , "driver: setup")
> DEFTIMEVAR (TV_DRIVER_SPEC , "driver: do spec on infiles")
> DEFTIMEVAR (TV_DRIVER_LINK , "driver: run linker")
> DEFTIMEVAR (TV_DRIVER_EXECUTE_AS , "driver: executing \"as\"")
> +DEFTIMEVAR (TV_DRIVER_EMBEDDED_AS , "driver: embedded assembler")
> DEFTIMEVAR (TV_DRIVER_EXECUTE_COLLECT2, "driver: executing \"collect2\"")
> DEFTIMEVAR (TV_DRIVER_EXECUTE_LD , "driver: executing \"ld\"")
> +DEFTIMEVAR (TV_DRIVER_EMBEDDED_LD , "driver: embedded linker")
> DEFTIMEVAR (TV_DRIVER_EXECUTE_OTHER , "driver: executing subprocess")
> DEFTIMEVAR (TV_LINK , "link JIT code")
> DEFTIMEVAR (TV_LOAD , "load JIT result")
> diff --git a/gcc/timevar.h b/gcc/timevar.h
> index d46dc88..a0133d2 100644
> --- a/gcc/timevar.h
> +++ b/gcc/timevar.h
> @@ -105,6 +105,16 @@ extern void timevar_cond_stop (timevar_id_t, bool);
> class timer
> {
> public:
> + /* Support for multiple collections of named timing items. */
> + enum item_dict
> + {
> + ITEM_DICT_JIT_CLIENT_CODE,
> + ITEM_DICT_EMBEDDED_AS,
> + ITEM_DICT_EMBEDDED_LD,
> + NUM_ITEM_DICTS
> + };
> +
> + public:
> timer ();
> ~timer ();
>
> @@ -115,12 +125,20 @@ class timer
> bool cond_start (timevar_id_t tv);
> void cond_stop (timevar_id_t tv);
>
> - void push_client_item (const char *item_name);
> - void pop_client_item ();
> + void push_named_item (enum item_dict dict,
> + const char *item_name);
> + void pop_named_item (enum item_dict dict);
>
> void print (FILE *fp);
>
> private:
> + /* A class for managing a collection of named timing items, for use
> + e.g. by libgccjit for timing client code. This class is declared
> + inside timevar.c to avoid everything using timevar.h
> + from needing vec and hash_map. */
> + class named_items;
> +
> + private:
> /* Private member functions. */
> void validate_phases (FILE *fp) const;
>
> @@ -131,6 +149,8 @@ class timer
> const timevar_time_def *total,
> const timevar_def *tv);
>
> + named_items *get_item_dict (enum item_dict dict);
> +
> private:
>
> /* Private type: a timing variable. */
> @@ -193,10 +213,15 @@ class timer
> element. */
> timevar_time_def m_start_time;
>
> - /* If non-NULL, for use when timing libgccjit's client code. */
> - named_items *m_jit_client_items;
> + /* Array of named_items, which are created on demand, and hence
> + may each be NULL/non-NULL. */
> + named_items *m_named_items[NUM_ITEM_DICTS];
>
> friend class named_items;
> +
> + /* Do we have any named items? Affects the output of the "print"
> + method. */
> + bool m_has_named_items;
> };
>
> /* Provided for backward compatibility. */
> --
> 1.8.5.3
>
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