Added bench.py and bench_runner.c for benchmarking

These are really just different flavors of test.py and test_runner.c
without support for power-loss testing, but with support for measuring
the cumulative number of bytes read, programmed, and erased.

Note that the existing define parameterization should work perfectly
fine for running benchmarks across various dimensions:

./scripts/bench.py \
    runners/bench_runner \
    bench_file_read \
    -gnor \
    -DSIZE='range(0,131072,1024)'

Also added a couple basic benchmarks as a starting point.

Makefile

@@ -7,7 +7,8 @@ $(if $(findstring n,$(MAKEFLAGS)),, $(shell mkdir -p \
 	$(BUILDDIR) \
 	$(BUILDDIR)bd \
 	$(BUILDDIR)runners \
-	$(BUILDDIR)tests))
+	$(BUILDDIR)tests \
+	$(BUILDDIR)benches))
 endif
 
 # overridable target/src/tools/flags/etc
@@ -45,6 +46,18 @@ TEST_CI	:= $(TEST_TAC:%.t.a.c=%.t.a.ci)
 TEST_GCNO := $(TEST_TAC:%.t.a.c=%.t.a.gcno)
 TEST_GCDA := $(TEST_TAC:%.t.a.c=%.t.a.gcda)
 
+BENCHES ?= $(wildcard benches/*.toml)
+BENCH_SRC ?= $(SRC) \
+		$(filter-out $(wildcard bd/*.*.c),$(wildcard bd/*.c)) \
+		runners/bench_runner.c
+BENCH_BC := $(BENCHES:%.toml=$(BUILDDIR)%.b.c) $(BENCH_SRC:%.c=$(BUILDDIR)%.b.c)
+BENCH_BAC := $(BENCH_BC:%.b.c=%.b.a.c)
+BENCH_OBJ := $(BENCH_BAC:%.b.a.c=%.b.a.o)
+BENCH_DEP := $(BENCH_BAC:%.b.a.c=%.b.a.d)
+BENCH_CI	:= $(BENCH_BAC:%.b.a.c=%.b.a.ci)
+BENCH_GCNO := $(BENCH_BAC:%.b.a.c=%.b.a.gcno)
+BENCH_GCDA := $(BENCH_BAC:%.b.a.c=%.b.a.gcda)
+
 ifdef DEBUG
 override CFLAGS += -O0
 else
@@ -60,27 +73,31 @@ override CFLAGS += -Wextra -Wshadow -Wjump-misses-init -Wundef
 override CFLAGS += -ftrack-macro-expansion=0
 
 override TESTFLAGS += -b
+override BENCHFLAGS += -b
 # forward -j flag
 override TESTFLAGS += $(filter -j%,$(MAKEFLAGS))
+override BENCHFLAGS += $(filter -j%,$(MAKEFLAGS))
 ifdef VERBOSE
-override TESTFLAGS     += -v
-override CODEFLAGS     += -v
-override DATAFLAGS     += -v
-override STACKFLAGS    += -v
-override STRUCTFLAGS   += -v
-override COVERAGEFLAGS += -v
-override TESTFLAGS     += -v
-override TESTCFLAGS    += -v
+override CODEFLAGS     	+= -v
+override DATAFLAGS     	+= -v
+override STACKFLAGS    	+= -v
+override STRUCTFLAGS   	+= -v
+override COVERAGEFLAGS 	+= -v
+override TESTFLAGS     	+= -v
+override TESTCFLAGS    	+= -v
+override BENCHFLAGS    	+= -v
+override BENCHCFLAGS  	+= -v
 endif
 ifdef EXEC
-override TESTFLAGS 	   += --exec="$(EXEC)"
+override TESTFLAGS 	   	+= --exec="$(EXEC)"
+override BENCHFLAGS	   	+= --exec="$(EXEC)"
 endif
 ifdef BUILDDIR
-override CODEFLAGS     += --build-dir="$(BUILDDIR:/=)"
-override DATAFLAGS     += --build-dir="$(BUILDDIR:/=)"
-override STACKFLAGS    += --build-dir="$(BUILDDIR:/=)"
-override STRUCTFLAGS   += --build-dir="$(BUILDDIR:/=)"
-override COVERAGEFLAGS += --build-dir="$(BUILDDIR:/=)"
+override CODEFLAGS     	+= --build-dir="$(BUILDDIR:/=)"
+override DATAFLAGS     	+= --build-dir="$(BUILDDIR:/=)"
+override STACKFLAGS    	+= --build-dir="$(BUILDDIR:/=)"
+override STRUCTFLAGS   	+= --build-dir="$(BUILDDIR:/=)"
+override COVERAGEFLAGS	+= --build-dir="$(BUILDDIR:/=)"
 endif
 ifneq ($(NM),nm)
 override CODEFLAGS += --nm-tool="$(NM)"
@@ -119,6 +136,17 @@ test: test-runner
 test-list: test-runner
 	./scripts/test.py $(BUILDDIR)runners/test_runner $(TESTFLAGS) -l
 
+.PHONY: bench-runner build-bench
+bench-runner build-bench: $(BUILDDIR)runners/bench_runner
+
+.PHONY: bench
+bench: bench-runner
+	./scripts/bench.py $(BUILDDIR)runners/bench_runner $(BENCHFLAGS)
+
+.PHONY: bench-list
+bench-list: bench-runner
+	./scripts/bench.py $(BUILDDIR)runners/bench_runner $(BENCHFLAGS) -l
+
 .PHONY: code
 code: $(OBJ)
 	./scripts/code.py $^ -S $(CODEFLAGS)
@@ -186,6 +214,9 @@ $(BUILDDIR)lfs.csv: \
 $(BUILDDIR)runners/test_runner: $(TEST_OBJ)
 	$(CC) $(CFLAGS) $^ $(LFLAGS) -o $@
 
+$(BUILDDIR)runners/bench_runner: $(BENCH_OBJ)
+	$(CC) $(CFLAGS) $^ $(LFLAGS) -o $@
+
 # our main build rule generates .o, .d, and .ci files, the latter
 # used for stack analysis
 $(BUILDDIR)%.o $(BUILDDIR)%.ci: %.c
@@ -206,6 +237,12 @@ $(BUILDDIR)%.t.c: %.toml
 $(BUILDDIR)%.t.c: %.c $(TESTS)
 	./scripts/test.py -c $(TESTS) -s $< $(TESTCFLAGS) -o $@
 
+$(BUILDDIR)%.b.c: %.toml
+	./scripts/bench.py -c $< $(BENCHCFLAGS) -o $@
+
+$(BUILDDIR)%.b.c: %.c $(BENCHES)
+	./scripts/bench.py -c $(BENCHES) -s $< $(BENCHCFLAGS) -o $@
+
 # clean everything
 .PHONY: clean
 clean:
@@ -219,6 +256,7 @@ clean:
 		$(BUILDDIR)lfs.struct.csv \
 		$(BUILDDIR)lfs.coverage.csv)
 	rm -f $(BUILDDIR)runners/test_runner
+	rm -f $(BUILDDIR)runners/bench_runner
 	rm -f $(OBJ)
 	rm -f $(DEP)
 	rm -f $(ASM)
@@ -230,3 +268,10 @@ clean:
 	rm -f $(TEST_CI)
 	rm -f $(TEST_GCNO)
 	rm -f $(TEST_GCDA)
+	rm -f $(BENCH_BC)
+	rm -f $(BENCH_BAC)
+	rm -f $(BENCH_OBJ)
+	rm -f $(BENCH_DEP)
+	rm -f $(BENCH_CI)
+	rm -f $(BENCH_GCNO)
+	rm -f $(BENCH_GCDA)