On 05/23/2016 03:10 PM, Emese Revfy wrote:
Add a very simple plugin to demonstrate the GCC plugin infrastructure. This GCC plugin computes the cyclomatic complexity of each function. The complexity M of a function's control flow graph is defined as: M = E - N + 2P where E = the number of edges N = the number of nodes P = the number of connected components (exit nodes).
This has some weird interaction with ftrace. On x86 1) make mrproper 2) make defconfig 3) enable GCC_PLUGINS, GCC_PLUGIN_CYC_COMPLEXITY 4) enable FUNCTION_TRACER (it will select other options as well) 5) make && make modules MODPOST 18 modules ERROR: "__fentry__" [net/netfilter/xt_nat.ko] undefined! ERROR: "__fentry__" [net/netfilter/xt_mark.ko] undefined! ERROR: "__fentry__" [net/netfilter/xt_addrtype.ko] undefined! ERROR: "__fentry__" [net/netfilter/xt_LOG.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat_sip.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat_irc.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat_ftp.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_log_common.ko] undefined! ERROR: "__fentry__" [net/ipv6/netfilter/nf_log_ipv6.ko] undefined! ERROR: "__fentry__" [net/ipv4/netfilter/nf_nat_masquerade_ipv4.ko] undefined! ERROR: "__fentry__" [net/ipv4/netfilter/nf_nat_ipv4.ko] undefined! ERROR: "__fentry__" [net/ipv4/netfilter/nf_log_ipv4.ko] undefined! ERROR: "__fentry__" [net/ipv4/netfilter/nf_log_arp.ko] undefined! ERROR: "__fentry__" [net/ipv4/netfilter/iptable_nat.ko] undefined! ERROR: "__fentry__" [net/ipv4/netfilter/ipt_MASQUERADE.ko] undefined! ERROR: "__fentry__" [fs/efivarfs/efivarfs.ko] undefined! ERROR: "__fentry__" [drivers/thermal/x86_pkg_temp_thermal.ko] undefined! scripts/Makefile.modpost:91: recipe for target '__modpost' failed make[1]: *** [__modpost] Error 1 Verified with gcc-5.3.1 and gcc-6.1.1. You need to do a clean build with 'make mrproper' first to see this. Subsequent builds will succeed oddly enough. I suspect this Thanks, Laura
Signed-off-by: Emese Revfy <re.emese@xxxxxxxxx> --- arch/Kconfig | 12 +++++ scripts/Makefile.gcc-plugins | 1 + scripts/gcc-plugins/Makefile | 1 + scripts/gcc-plugins/cyc_complexity_plugin.c | 73 +++++++++++++++++++++++++++++ 4 files changed, 87 insertions(+) create mode 100644 scripts/gcc-plugins/cyc_complexity_plugin.c diff --git a/arch/Kconfig b/arch/Kconfig index 2821cfe..74f0d63 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -372,6 +372,18 @@ menuconfig GCC_PLUGINS See Documentation/gcc-plugins.txt for details. +config GCC_PLUGIN_CYC_COMPLEXITY + bool "Compute the cyclomatic complexity of a function" + depends on GCC_PLUGINS + help + The complexity M of a function's control flow graph is defined as: + M = E - N + 2P + where + + E = the number of edges + N = the number of nodes + P = the number of connected components (exit nodes). + config HAVE_CC_STACKPROTECTOR bool help diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins index bcc373d..b4a189c 100644 --- a/scripts/Makefile.gcc-plugins +++ b/scripts/Makefile.gcc-plugins @@ -2,6 +2,7 @@ ifdef CONFIG_GCC_PLUGINS __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC)) PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)") + gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile index a4c9341..c60ba4b 100644 --- a/scripts/gcc-plugins/Makefile +++ b/scripts/gcc-plugins/Makefile @@ -17,4 +17,5 @@ export GCCPLUGINS_DIR HOSTLIBS $(HOSTLIBS)-y := $(GCC_PLUGIN) always := $($(HOSTLIBS)-y) +cyc_complexity_plugin-objs := cyc_complexity_plugin.o clean-files += *.so diff --git a/scripts/gcc-plugins/cyc_complexity_plugin.c b/scripts/gcc-plugins/cyc_complexity_plugin.c new file mode 100644 index 0000000..34df974 --- /dev/null +++ b/scripts/gcc-plugins/cyc_complexity_plugin.c @@ -0,0 +1,73 @@ +/* + * Copyright 2011-2016 by Emese Revfy <re.emese@xxxxxxxxx> + * Licensed under the GPL v2, or (at your option) v3 + * + * Homepage: + * https://github.com/ephox-gcc-plugins/cyclomatic_complexity + * + * http://en.wikipedia.org/wiki/Cyclomatic_complexity + * The complexity M is then defined as: + * M = E - N + 2P + * where + * + * E = the number of edges of the graph + * N = the number of nodes of the graph + * P = the number of connected components (exit nodes). + * + * Usage (4.5 - 5): + * $ make clean; make run + */ + +#include "gcc-common.h" + +int plugin_is_GPL_compatible; + +static struct plugin_info cyc_complexity_plugin_info = { + .version = "20160225", + .help = "Cyclomatic Complexity\n", +}; + +static unsigned int cyc_complexity_execute(void) +{ + int complexity; + expanded_location xloc; + + /* M = E - N + 2P */ + complexity = n_edges_for_fn(cfun) - n_basic_blocks_for_fn(cfun) + 2; + + xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl)); + fprintf(stderr, "Cyclomatic Complexity %d %s:%s\n", complexity, + xloc.file, DECL_NAME_POINTER(current_function_decl)); + + return 0; +} + +#define PASS_NAME cyc_complexity + +#define NO_GATE +#define TODO_FLAGS_FINISH TODO_dump_func + +#include "gcc-generate-gimple-pass.h" + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + struct register_pass_info cyc_complexity_pass_info; + + cyc_complexity_pass_info.pass = make_cyc_complexity_pass(); + cyc_complexity_pass_info.reference_pass_name = "ssa"; + cyc_complexity_pass_info.ref_pass_instance_number = 1; + cyc_complexity_pass_info.pos_op = PASS_POS_INSERT_AFTER; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, + &cyc_complexity_plugin_info); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, + &cyc_complexity_pass_info); + + return 0; +}
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