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-rw-r--r--src/sanity.h89
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+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/**
+ * Sanitizer interface.
+ */
+
+#ifndef BFS_SANITY_H
+#define BFS_SANITY_H
+
+#include "config.h"
+#include <stddef.h>
+
+#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+# define SANITIZE_ADDRESS true
+#endif
+
+#if __has_feature(memory_sanitizer) || defined(__SANITIZE_MEMORY__)
+# define SANITIZE_MEMORY true
+#endif
+
+#if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
+# define SANITIZE_THREAD true
+#endif
+
+// Call macro(ptr, size) or macro(ptr, sizeof(*ptr))
+#define SANITIZE_CALL(...) \
+ SANITIZE_CALL_(__VA_ARGS__, )
+
+#define SANITIZE_CALL_(macro, ptr, ...) \
+ SANITIZE_CALL__(macro, ptr, __VA_ARGS__ sizeof(*(ptr)), )
+
+#define SANITIZE_CALL__(macro, ptr, size, ...) \
+ macro(ptr, size)
+
+#if SANITIZE_ADDRESS
+# include <sanitizer/asan_interface.h>
+
+/**
+ * sanitize_alloc(ptr, size = sizeof(*ptr))
+ *
+ * Mark a memory region as allocated.
+ */
+#define sanitize_alloc(...) SANITIZE_CALL(__asan_unpoison_memory_region, __VA_ARGS__)
+
+/**
+ * sanitize_free(ptr, size = sizeof(*ptr))
+ *
+ * Mark a memory region as free.
+ */
+#define sanitize_free(...) SANITIZE_CALL(__asan_poison_memory_region, __VA_ARGS__)
+
+#else
+# define sanitize_alloc sanitize_uninit
+# define sanitize_free sanitize_uninit
+#endif
+
+#if SANITIZE_MEMORY
+# include <sanitizer/msan_interface.h>
+
+/**
+ * sanitize_init(ptr, size = sizeof(*ptr))
+ *
+ * Mark a memory region as initialized.
+ */
+#define sanitize_init(...) SANITIZE_CALL(__msan_unpoison, __VA_ARGS__)
+
+/**
+ * sanitize_uninit(ptr, size = sizeof(*ptr))
+ *
+ * Mark a memory region as uninitialized.
+ */
+#define sanitize_uninit(...) SANITIZE_CALL(__msan_allocated_memory, __VA_ARGS__)
+
+#else
+# define sanitize_init(...)
+# define sanitize_uninit(...)
+#endif
+
+/**
+ * Initialize a variable, unless sanitizers would detect uninitialized uses.
+ */
+#if SANITIZE_MEMORY
+# define uninit(var, value) var
+#else
+# define uninit(var, value) value
+#endif
+
+#endif // BFS_SANITY_H