Reintroduced test-defines into the new test_runner

This moves defines entirely into the runtime of the test_runner,
simplifying thing and reducing the amount of generated code that needs
to be build, at the cost of limiting test-defines to uintmax_t types.

This is implemented using a set of index-based scopes (created by
test.py) that allow different layers to override defines from other
layers, accessible through the global `test_define` function.

layers:
1. command-line overrides
2. per-case defines
3. per-geometry defines

runners/test_runner.h

@@ -4,11 +4,24 @@
 #include "lfs.h"
 
 
+// generated test configurations
+enum test_type {
+    TEST_NORMAL    = 0x1,
+    TEST_REENTRANT = 0x2,
+    TEST_VALGRIND  = 0x4,
+};
+
 struct test_case {
     const char *id;
     const char *name;
     const char *path;
-    uint32_t permutations;
+    uint8_t types;
+    size_t permutations;
+
+    const uintmax_t *const *defines;
+    const bool *define_mask;
+
+    bool (*filter)(struct lfs_config *cfg, uint32_t perm);
     void (*run)(struct lfs_config *cfg, uint32_t perm);
 };
 
@@ -16,11 +29,33 @@ struct test_suite {
     const char *id;
     const char *name;
     const char *path;
+
+    const char *const *define_names;
+    size_t define_count;
+
     const struct test_case *const *cases;
     size_t case_count;
 };
 
+// TODO remove this indirection
 extern const struct test_suite *test_suites[];
 extern const size_t test_suite_count;
 
+
+// access generated test defines
+uintmax_t test_define(size_t define);
+
+// a few preconfigured defines that control how tests run
+#define READ_SIZE           test_define(0)
+#define PROG_SIZE           test_define(1)
+#define BLOCK_SIZE          test_define(2)
+#define BLOCK_COUNT         test_define(3)
+#define BLOCK_CYCLES        test_define(4)
+#define CACHE_SIZE          test_define(5)
+#define LOOKAHEAD_SIZE      test_define(6)
+#define ERASE_VALUE         test_define(7)
+#define ERASE_CYCLES        test_define(8)
+#define BADBLOCK_BEHAVIOR   test_define(9)
+
+
 #endif