Hi.
Sorry for attaching a wrong patch.
Martin
>From 7d3887b1b24901eca69614e601b6e8f36e5c86eb Mon Sep 17 00:00:00 2001
From: marxin <mli...@suse.cz>
Date: Fri, 9 Nov 2018 16:28:07 +0100
Subject: [PATCH] Come up with -flive-patching master option.
gcc/ChangeLog:
2018-11-09 Martin Liska <mli...@suse.cz>
* common.opt: Add -flive-patching option.
* opts.c (disable_live_patching_related_optimizations): New
function where we disable all optimizations that are potentially
dangerous for live patching.
(common_handle_option): Call the function.
---
gcc/common.opt | 4 ++++
gcc/opts.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/gcc/common.opt b/gcc/common.opt
index 98e8eb03ef3..475b667f26b 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2156,6 +2156,10 @@ flive-range-shrinkage
Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
Relief of register pressure through live range shrinkage.
+flive-patching
+Common Report Var(flag_live_patching) Init(0) Optimization
+Perform only safe IPA transformations for live patching.
+
frename-registers
Common Report Var(flag_rename_registers) Init(2) Optimization
Perform a register renaming optimization pass.
diff --git a/gcc/opts.c b/gcc/opts.c
index e21967ba84d..dd0c24ac2f9 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -1548,6 +1548,33 @@ enable_fdo_optimizations (struct gcc_options *opts,
opts->x_flag_tree_loop_distribute_patterns = value;
}
+/* Disable IPA optimization that are not safe for live patching. */
+
+static void
+disable_live_patching_related_optimizations (gcc_options *opts,
+ gcc_options *opts_set)
+{
+ if (!opts_set->x_flag_ipa_icf_functions)
+ opts->x_flag_ipa_icf_functions = 0;
+
+ if (!opts_set->x_flag_ipa_icf)
+ opts->x_flag_ipa_icf = 0;
+ if (!opts_set->x_flag_ipa_icf_variables)
+ opts->x_flag_ipa_icf_variables = 0;
+ if (!opts_set->x_flag_ipa_pure_const)
+ opts->x_flag_ipa_pure_const = 0;
+ if (!opts_set->x_flag_ipa_pta)
+ opts->x_flag_ipa_pta = 0;
+ if (!opts_set->x_flag_ipa_reference)
+ opts->x_flag_ipa_reference = 0;
+ if (!opts_set->x_flag_ipa_reference_addressable)
+ opts->x_flag_ipa_reference_addressable = 0;
+ if (!opts_set->x_flag_ipa_stack_alignment)
+ opts->x_flag_ipa_stack_alignment = 0;
+ if (!opts_set->x_flag_ipa_ra)
+ opts->x_flag_ipa_ra = 0;
+}
+
/* -f{,no-}sanitize{,-recover}= suboptions. */
const struct sanitizer_opts_s sanitizer_opts[] =
{
@@ -2266,6 +2293,10 @@ common_handle_option (struct gcc_options *opts,
(&opts->x_flag_instrument_functions_exclude_files, arg);
break;
+ case OPT_flive_patching:
+ if (value)
+ disable_live_patching_related_optimizations (opts, opts_set);
+
case OPT_fmessage_length_:
pp_set_line_maximum_length (dc->printer, value);
diagnostic_set_caret_max_width (dc, value);
--
2.19.1
