From f49687eda5ec2bd4fae34c362192ae6739f8c0f9 Mon Sep 17 00:00:00 2001 From: Heli Date: Mon, 4 May 2026 15:46:33 +0530 Subject: [PATCH] gcc: Add initial -ftime-trace support Signed-off-by: Heli --- gcc/common.opt | 4 +++ gcc/doc/invoke.texi | 8 ++++- gcc/testsuite/gcc.dg/ftime-trace-1.c | 7 ++++ gcc/toplev.cc | 52 ++++++++++++++++++++++++++++ 4 files changed, 70 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.dg/ftime-trace-1.c diff --git a/gcc/common.opt b/gcc/common.opt index 5d0e255a40d..ac487b6896c 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -3156,6 +3156,10 @@ ftime-report Common Var(time_report) Report the time taken by each compiler pass. +ftime-trace +Common Var(flag_time_trace) +Generate a JSON trace file showing where the compiler spends time. + ftime-report-details Common Var(time_report_details) Record times taken by sub-phases separately. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 756af474310..22cb88a0622 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -860,7 +860,7 @@ Objective-C and Objective-C++ Dialects}. -fmultiflags -fprofile-report -frandom-seed=@var{string} -fsched-verbose=@var{n} -fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose --fstats -fstack-usage -ftime-report -ftime-report-details +-fstats -fstack-usage -ftime-report -ftime-report-details -ftime-trace -fvar-tracking-assignments-toggle -gtoggle -print-autofdo-gcov-version -print-file-name=@var{library} -print-libgcc-file-name @@ -20896,6 +20896,11 @@ finishes. @opindex ftime-report @opindex fno-time-report @item -ftime-report +@opindex ftime-trace +@item -ftime-trace +Emit a JSON trace file containing timing information for the compilation. +The output is intended to be compatible with trace-viewing tools such as +Chrome's tracing viewer. Makes the compiler print some statistics to stderr about the time consumed by each pass when it finishes. @@ -20910,6 +20915,7 @@ slightly different place within the compiler. @opindex ftime-report-details @opindex fno-time-report-details @item -ftime-report-details + Record the time consumed by infrastructure parts separately for each pass. @opindex fira-verbose diff --git a/gcc/testsuite/gcc.dg/ftime-trace-1.c b/gcc/testsuite/gcc.dg/ftime-trace-1.c new file mode 100644 index 00000000000..949f6b08476 --- /dev/null +++ b/gcc/testsuite/gcc.dg/ftime-trace-1.c @@ -0,0 +1,7 @@ +/* { dg-do compile } */ +/* { dg-options "-ftime-trace" } */ + +int main(void) +{ + return 0; +} diff --git a/gcc/toplev.cc b/gcc/toplev.cc index 66fa927c53d..481c78468e7 100644 --- a/gcc/toplev.cc +++ b/gcc/toplev.cc @@ -23,6 +23,7 @@ along with GCC; see the file COPYING3. If not see Error messages and low-level interface to malloc also handled here. */ #define INCLUDE_VECTOR +#include #include "config.h" #include "system.h" #include "coretypes.h" @@ -2141,11 +2142,55 @@ standard_type_bitsize (int bitsize) return true; return false; } +/*Adding helper function*/ +static long long +gcc_time_trace_now_us () +{ + struct timespec ts; + clock_gettime (CLOCK_MONOTONIC, &ts); + return (long long) ts.tv_sec * 1000000LL + ts.tv_nsec / 1000; +} + +static void +gcc_write_simple_time_trace (const char *filename, + long long start_us, + long long end_us) +{ + if (!filename) + filename = "gcc-time-trace"; + + char trace_name[4096]; + + snprintf (trace_name, sizeof (trace_name), "%s.json", filename); + FILE *f = fopen (trace_name, "w"); + if (!f) + return; + + fprintf (f, "{\n"); + fprintf (f, " \"traceEvents\": [\n"); + fprintf (f, " {\n"); + fprintf (f, " \"name\": \"total compilation\",\n"); + fprintf (f, " \"ph\": \"X\",\n"); + fprintf (f, " \"ts\": 0,\n"); + fprintf (f, " \"dur\": %lld,\n", end_us - start_us); + fprintf (f, " \"pid\": 1,\n"); + fprintf (f, " \"tid\": 1\n"); + fprintf (f, " }\n"); + fprintf (f, " ],\n"); + fprintf (f, " \"displayTimeUnit\": \"us\"\n"); + fprintf (f, "}\n"); + + fclose (f); +} /* Initialize the compiler, and compile the input file. */ static void do_compile () { + long long time_trace_start_us = 0; + + if (flag_time_trace) + time_trace_start_us = gcc_time_trace_now_us (); /* Don't do any more if an error has already occurred. */ if (!seen_error ()) { @@ -2235,6 +2280,13 @@ do_compile () timevar_stop (TV_PHASE_FINALIZE); } + if (flag_time_trace) + { + long long time_trace_end_us = gcc_time_trace_now_us (); + gcc_write_simple_time_trace (main_input_filename, + time_trace_start_us, + time_trace_end_us); + } } toplev::toplev (timer *external_timer, -- 2.34.1