feat(frailbox): add buddy allocator with stats and tests (Closes #2)

diagnostic/build-bf2147ac-metadata.json

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+}

frailbox/Makefile

@@ -1,43 +1,59 @@
-CC = gcc
-CFLAGS = -Wall -Wextra -Wpedantic -std=c2x -O2 -g
-CFLAGS += -D_FORTIFY_SOURCE=3
-CFLAGS += -fstack-protector-strong
-CFLAGS += -fPIE
-LDFLAGS = -pie -z relro -z now
-
-SRCDIR = src
-INCDIR = include
-BUILDDIR = build
-
-SRCS = $(wildcard $(SRCDIR)/*.c) main.c
-OBJS = $(patsubst %.c, $(BUILDDIR)/%.o, $(SRCS))
-DEPS = $(OBJS:.o=.d)
-
-TARGET = frailbox
-
-.PHONY: all clean
-
-all: $(TARGET)
-
-$(TARGET): $(OBJS)
-	$(CC) $(CFLAGS) -I$(INCDIR) $^ -o $@ $(LDFLAGS)
-
-$(BUILDDIR)/%.o: %.c
-	@mkdir -p $(dir $@)
-	$(CC) $(CFLAGS) -I$(INCDIR) -MMD -MP -c $< -o $@
-
--include $(DEPS)
-
-clean:
-	rm -rf $(BUILDDIR) $(TARGET)
-
-distclean: clean
-	rm -rf *.o *.d
-
-test: $(TARGET)
-	./$(TARGET) --sandbox-type seccomp --memory-limit 64 --verbose
-
-valgrind: $(TARGET)
-	valgrind --leak-check=full --show-leak-kinds=all ./$(TARGET)
-
-.PHONY: all clean distclean test valgrind
+CC = gcc
+UNAME_S := $(shell uname -s)
+CFLAGS = -Wall -Wextra -Wpedantic -std=c2x -O2 -g
+CFLAGS += -D_FORTIFY_SOURCE=3
+CFLAGS += -fstack-protector-strong
+CFLAGS += -fPIE
+LDFLAGS =
+ifeq ($(UNAME_S),Linux)
+LDFLAGS += -pie -z relro -z now
+endif
+
+SRCDIR = src
+INCDIR = include
+BUILDDIR = build
+
+SRCS = $(wildcard $(SRCDIR)/*.c) main.c
+OBJS = $(patsubst %.c, $(BUILDDIR)/%.o, $(SRCS))
+DEPS = $(OBJS:.o=.d)
+
+TARGET = frailbox
+BUDDY_TEST = $(BUILDDIR)/test_buddy
+
+.PHONY: all clean test-logger-errors test-buddy
+
+all: $(TARGET)
+
+test-logger-errors:
+	$(CC) $(CFLAGS) -I$(INCDIR) $(SRCDIR)/logger.c tests/test_logger_errors.c -o $(BUILDDIR)/test_logger_errors $(LDFLAGS) -lpthread
+	./$(BUILDDIR)/test_logger_errors
+
+$(TARGET): $(OBJS)
+	$(CC) $(CFLAGS) -I$(INCDIR) $^ -o $@ $(LDFLAGS)
+
+$(BUILDDIR)/%.o: %.c
+	@mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -I$(INCDIR) -MMD -MP -c $< -o $@
+
+$(BUDDY_TEST): tests/test_buddy.c $(SRCDIR)/buddy.c $(INCDIR)/buddy.h
+	@mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -I$(INCDIR) tests/test_buddy.c $(SRCDIR)/buddy.c -o $@ $(LDFLAGS)
+
+-include $(DEPS)
+
+clean:
+	rm -rf $(BUILDDIR) $(TARGET)
+
+distclean: clean
+	rm -rf *.o *.d
+
+test: $(TARGET)
+	./$(TARGET) --sandbox-type seccomp --memory-limit 64 --verbose
+
+test-buddy: $(BUDDY_TEST)
+	./$(BUDDY_TEST)
+
+valgrind: $(TARGET)
+	valgrind --leak-check=full --show-leak-kinds=all ./$(TARGET)
+
+.PHONY: all clean distclean test test-buddy valgrind

frailbox/include/buddy.h

@@ -0,0 +1,41 @@
+#ifndef FRAILBOX_BUDDY_H
+#define FRAILBOX_BUDDY_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define BUDDY_MIN_BLOCK_SIZE 64u
+
+typedef struct buddy_allocator buddy_allocator_t;
+
+typedef struct buddy_stats {
+    size_t   capacity_bytes;
+    size_t   allocated_bytes;
+    size_t   reserved_bytes;
+    size_t   free_bytes;
+    size_t   largest_free_block;
+    uint64_t allocation_count;
+    uint64_t deallocation_count;
+    uint64_t split_count;
+    uint64_t coalesce_count;
+    double   fragmentation_ratio;
+} buddy_stats_t;
+
+buddy_allocator_t *buddy_create(size_t capacity_bytes);
+void               buddy_destroy(buddy_allocator_t *allocator);
+
+void *buddy_alloc(buddy_allocator_t *allocator, size_t size);
+void  buddy_free(buddy_allocator_t *allocator, void *ptr);
+
+buddy_stats_t buddy_stats(const buddy_allocator_t *allocator);
+int           buddy_contains(const buddy_allocator_t *allocator, const void *ptr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif