shoney.arickathil
bab88a53b9
- 16 tasks complete: arena, object model, borrow word, containers, RC + budgeted cycle collector, wob_build, validating loader, interpreter core (dual dispatch), object opcodes, drop-map unwinding, builtins + DB_STUB + TRAP, ICALL, wovm CLI + just recipes - 13 test suites × 2 dispatch flavors (ASan+UBSan) + CLI smoke, all green - .wob v1 format pinned in src/wob.h + docs/plan/oop-vm/00-wob-format.md - wo-rt.c reference event-loop preserved for sub-project 2 This is Iteration 2 of the OOP milestone; compiler front (Iteration 3) is in progress on this branch. They meet at Iteration 4 (emitter+e2e).
177 lines
6.4 KiB
C
177 lines
6.4 KiB
C
/* wob.h — the .wob v1 compiler↔VM contract.
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* Single source of truth for format constants, opcodes, field kinds, trap
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* codes, builtin ids, limits, and the 16-byte object header shared by every
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* runtime module. Normative prose: docs/plan/oop-vm/00-wob-format.md.
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* All on-disk integers are little-endian; x86-64/ARM64 Linux only (M1).
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*/
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#ifndef WO_WOB_H
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#define WO_WOB_H
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#include <stddef.h>
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#include <stdint.h>
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/* ---- file header (44 bytes, absolute offsets) ---- */
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#define WOB_MAGIC 0x31424F57u /* "WOB1" read as LE u32 */
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#define WOB_VERSION 1u
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#define WOB_HDR_SIZE 44u
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#define WOB_OFF_MAGIC 0u
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#define WOB_OFF_VERSION 4u
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#define WOB_OFF_CONST 8u /* u32 offset, u32 count */
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#define WOB_OFF_CLASS 16u
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#define WOB_OFF_IFACE 24u
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#define WOB_OFF_METHOD 32u
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#define WOB_OFF_ENTRY 40u
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#define WOB_NONE 0xFFFFFFFFu /* "no entry method" / "free fn" class id */
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/* ---- constant pool tags ---- */
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#define WOB_K_INT 0u /* tag byte, then i64 */
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#define WOB_K_TEXT 1u /* tag byte, then u32 len + bytes (no NUL) */
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/* ---- field kinds (one byte per field in the class table) ---- */
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enum {
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WO_K_SCALAR = 0,
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WO_K_OWNED = 1,
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WO_K_GCREF = 2,
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WO_K_TEXT = 3,
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WO_K_MULTI = 4,
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WO_K_MAP = 5,
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};
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#define WO_K_MAX 5u
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/* ---- loader-enforced limits ---- */
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#define WO_MAX_REGS 64u
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#define WO_STACK_SLOTS 4096u
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#define WO_MAX_FRAMES 256u
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/* ---- object header: every heap value carries this (spec section 4) ---- */
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typedef struct wo_hdr {
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uint32_t class_id; /* class-table index or a WO_CLS_* sentinel */
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uint16_t shard_id; /* always 0 in milestone 1; reserved for sub-project 2 */
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uint8_t flags;
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uint8_t pad;
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uint32_t borrow; /* WO_BORROW_FREE / reader count / WO_BORROW_EXCL */
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uint32_t rc; /* strong count, @gc objects only */
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} wo_hdr;
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_Static_assert(sizeof(wo_hdr) == 16, "object header must be exactly 16 bytes");
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/* header flags */
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#define WO_F_GC 0x01u /* instance of a @gc class: rc rules apply */
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#define WO_F_BUF 0x02u /* sitting in the cycle-candidate buffer */
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#define WO_F_CONST 0x04u /* loader-interned constant (strings): free is a no-op */
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/* two color bits for Bacon–Rajan trial deletion */
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#define WO_F_COLOR 0x18u
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#define WO_COLOR_BLACK 0x00u
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#define WO_COLOR_GRAY 0x08u
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#define WO_COLOR_WHITE 0x10u
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/* native class-id sentinels (top of the u32 range; loader rejects user
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* class counts anywhere near these) */
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#define WO_CLS_STR 0xFFFFFFFCu
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#define WO_CLS_MAP 0xFFFFFFFDu
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#define WO_CLS_MULTI 0xFFFFFFFEu
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/* borrow word states */
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#define WO_BORROW_FREE 0u
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#define WO_BORROW_EXCL 0xFFFFFFFFu
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/* ---- trap codes (spec section 6) ---- */
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enum {
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WO_T_DIV0 = 1,
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WO_T_BORROW = 2,
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WO_T_STACK = 3,
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WO_T_OOM = 4,
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WO_T_DB = 5,
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WO_T_BOUNDS = 6,
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WO_T_KEY = 7,
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WO_T_EXPLICIT = 8,
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};
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/* ---- opcodes (spec section 5; semantics in the format doc) ---- */
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enum {
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WOP_NOP = 0,
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WOP_LOADK = 1, /* A Bx : r[A] = const[Bx] */
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WOP_MOVE = 2, /* A B : r[A] = r[B] (owned move: source is dead) */
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WOP_ADD = 3, /* A B C: i64, wrapping */
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WOP_SUB = 4,
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WOP_MUL = 5,
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WOP_DIV = 6, /* traps DIV0 on 0 and INT64_MIN / -1 */
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WOP_NEG = 7, /* A B */
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WOP_CONCAT = 8, /* A B C: new owned text */
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WOP_EQ = 9, /* A B C: i64 compare, 0/1 */
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WOP_LT = 10,
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WOP_LE = 11,
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WOP_EQS = 12, /* A B C: text content equality */
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WOP_JMP = 13, /* sBx */
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WOP_JZ = 14, /* A sBx: jump when r[A] == 0 */
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WOP_CALL = 15, /* A Bx : call method Bx, window at caller base + A */
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WOP_ICALL = 16, /* A Bx : interface call by global slot id Bx */
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WOP_RET = 17, /* A */
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WOP_RET0 = 18,
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WOP_NEW = 19, /* A Bx : zeroed instance of class Bx */
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WOP_GETF = 20, /* A B C: r[A] = field C of object r[B] */
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WOP_SETF = 21, /* A B C: field B of object r[A] = r[C]; no auto-drop */
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WOP_DROP = 22, /* A : recursive owned drop, nulls the register */
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WOP_BORROW_S = 23,
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WOP_BORROW_X = 24,
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WOP_RELEASE_S = 25,
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WOP_RELEASE_X = 26,
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WOP_RC_INC = 27,
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WOP_RC_DEC = 28,
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WOP_BUILTIN = 29, /* A B C: r[A] = builtin C, args from r[B] */
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WOP_DB_STUB = 30, /* traps WO_T_DB "engine not linked" */
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WOP_TRAP = 31, /* Bx: explicit trap */
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};
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#define WOP_MAX 31u
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/* ---- builtin ids (WOP_BUILTIN operand C) ---- */
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enum {
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WO_B_NOW = 0, /* () -> i64 wall-clock ms */
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WO_B_PRINT = 1, /* (text) newline-terminated to rt output stream */
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WO_B_PRINT_INT = 2, /* (i64) */
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WO_B_WORDS = 3, /* (text) -> i64 whitespace token count */
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WO_B_MULTI_NEW = 4, /* elem kind immediate in B */
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WO_B_MULTI_PUSH = 5,
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WO_B_MULTI_GET = 6,
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WO_B_COUNT = 7,
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WO_B_LATEST = 8,
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WO_B_MAP_NEW = 9, /* key/val kind nibbles immediate in B */
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WO_B_MAP_SET = 10,
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WO_B_MAP_GET = 11, /* missing key traps WO_T_KEY */
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WO_B_MAP_HAS = 12,
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};
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#define WO_B_MAX 12u
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/* ---- instruction encode/decode: op:8 A:8 then B:8 C:8 or Bx:16 ---- */
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static inline uint32_t wo_ins_abc(uint8_t op, uint8_t a, uint8_t b, uint8_t c) {
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return (uint32_t)op | ((uint32_t)a << 8) | ((uint32_t)b << 16) | ((uint32_t)c << 24);
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}
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static inline uint32_t wo_ins_abx(uint8_t op, uint8_t a, uint16_t bx) {
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return (uint32_t)op | ((uint32_t)a << 8) | ((uint32_t)bx << 16);
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}
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/* signed jumps: sBx encodes as Bx - 32768 */
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static inline uint32_t wo_ins_asbx(uint8_t op, uint8_t a, int32_t sbx) {
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return wo_ins_abx(op, a, (uint16_t)(sbx + 32768));
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}
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static inline uint8_t wo_ins_op(uint32_t i) { return (uint8_t)(i & 0xFFu); }
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static inline uint8_t wo_ins_a(uint32_t i) { return (uint8_t)((i >> 8) & 0xFFu); }
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static inline uint8_t wo_ins_b(uint32_t i) { return (uint8_t)((i >> 16) & 0xFFu); }
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static inline uint8_t wo_ins_c(uint32_t i) { return (uint8_t)((i >> 24) & 0xFFu); }
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static inline uint16_t wo_ins_bx(uint32_t i) { return (uint16_t)(i >> 16); }
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static inline int32_t wo_ins_sbx(uint32_t i) { return (int32_t)wo_ins_bx(i) - 32768; }
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/* ---- class descriptor shared by loader and runtime ---- */
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typedef struct wo_classdesc {
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uint32_t name; /* constant index of the class name */
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uint32_t flags; /* bit0: instances are @gc */
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uint32_t field_cnt;
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const uint8_t *kinds; /* field_cnt kind bytes, declaration order */
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} wo_classdesc;
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#define WO_CLASSF_GC 0x01u
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/* runtime object layout: 16-byte header then one 8-byte slot per field */
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static inline size_t wo_obj_size(const wo_classdesc *c) {
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return sizeof(wo_hdr) + (size_t)c->field_cnt * 8u;
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}
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static inline uint64_t *wo_fields(wo_hdr *o) { return (uint64_t *)(o + 1); }
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#endif /* WO_WOB_H */
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