shoney.arickathil
65e5739492
- FK restrict: deleting a row a non-nullable `ref` still points at traps WO_T_FK (11), catchable. The compiler now records a `ref` field's target class in the class-table field_class metadata; the engine (wo_row_has_referrers) scans referencing scalar columns before a delete. Correctness-first full scan; the backlink-index optimization is recorded for later - docs/examples/employee now COMPILES AND RUNS all six modes against a WAL-durable database: seed (+@unique trap across restart), report (per-dept aggregates + payroll), staff (unique probe + backlink + ref nav), raise (update-through-row), drop (FK restrict), and persistence via replay - group-by SYNTAX parked to a future iteration (user decision): the report mode is hand-rolled from the shipped primitives meanwhile (same numbers). "table relations and FK" is complete - scripts/employee-accept.sh (8 checks) + a `just employee` module; manifest parser tolerates iteration 9c's [share]/[[share.clients]] sections so `woc .` builds the sample on this branch - fixtures trap/db-fk-restrict (code 11) + run/db-fk-restrict-catch; oop-e2e 79/0, woc-test 566/0, 15 runtime suites, log-watcher 7/0, employee-accept 8/0 - 9b story + status board updated Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
378 lines
19 KiB
C
378 lines
19 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 3u /* v3: v2's field metadata + per-class index metadata */
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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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/* ---- class-table field metadata (v2) ----
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* Every class row carries, after its kind bytes, three u32 arrays — one
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* entry per field: the constant index of the field's NAME, the class id the
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* field REFERS to, and the element kinds of a container field. They exist
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* for one reason: `json.encode`/`json.decode` are runtime services driven by
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* class metadata (runtime/src/json.c) instead of per-type generated code, so
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* the names a JSON object needs and the shapes a decode must build have to
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* be in the image. Absent metadata is WOB_NONE / 0, which every other part
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* of the runtime ignores.
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*
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* field_class[i]: the class id of an OWNED/GCREF field, or of a container
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* field's element when that element is a class; WOB_FIELD_JSON_RAW marks a
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* `json.Value` field, whose Text holds raw JSON that encode emits verbatim
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* and decode captures unparsed; WOB_NONE otherwise.
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* field_elem[i]: for a MULTI field, its element kind; for a MAP field, the
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* key kind in the low byte and the value kind in the next; 0 otherwise. */
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#define WOB_FIELD_JSON_RAW 0xFFFFFFFEu
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/* A `?Int`/`?Bool`/`?Timestamp`/`?Id` field. Absence cannot be the zero word
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* for a scalar — 0 is a perfectly good Int, and the driving workload stores it
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* in a `?Int` (a cron `*` field expands to `0`) — so a nullable SCALAR spells
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* nil as WO_NIL_SCALAR instead. Heap-shaped optionals (`?Text`, `?Rec`,
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* `?multi`, …) keep the zero word: a null pointer is unambiguous. The marker
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* exists so the runtime can tell the two apart where it must write absence
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* itself, which today is json.decode leaving an absent key nil. */
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#define WOB_FIELD_NIL_SCALAR 0xFFFFFFFDu
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/* nil for a nullable scalar: -(2^62). Not INT64_MIN, deliberately — the
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* compiler's own integers are OCaml's 63-bit native ints, so INT64_MIN is not
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* expressible on the emitting side at all. One (absurd) value is unavailable
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* inside a `?Int`; that is the whole cost of the choice. */
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#define WO_NIL_SCALAR ((uint64_t)(int64_t)(-4611686018427387904LL))
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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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/* systems stdlib: a syscall the source cannot prevent said no (a
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* missing directory, a closed socket, a failed exec). errno's own
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* message rides along in the error record, and `try ... catch` is how
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* a program that expects the failure handles it. */
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WO_T_IO = 9,
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/* iteration 9 Task 4: a unique-index violation on insert/update —
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raised by the engine at the row choke point, catchable like any
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trap (the employee sample's SEED-DUP line) */
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WO_T_UNIQUE = 10,
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/* iteration 9b: deleting a row still referenced by a `ref` traps here
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(restrict) — the employee sample's DROP-of-a-department-with-staff */
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WO_T_FK = 11,
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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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/* haxe-parity compiler Task 5: try/catch over the trap system.
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* TRY pushes a catch frame {this frame, this window, handler pc =
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* pc + sBx, error register A}; a trap raised while it is the
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* innermost one unwinds every frame above this one exactly as an
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* uncaught trap does (drop maps run, registers null), releases what
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* the try region itself owned in this frame, and resumes at the
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* handler instead of leaving the VM. ENDTRY pops it — the try
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* region completed without trapping. Uncaught behavior is
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* unchanged: with no catch frame live, a trap is byte-for-byte
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* today's surface. */
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WOP_TRY = 32, /* A sBx: push catch frame, handler at pc + sBx */
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WOP_ENDTRY = 33, /* pop the innermost catch frame */
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};
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#define WOP_MAX 33u
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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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/* haxe-parity compiler Task 2: string interpolation's Int -> Text
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* conversion (`"${count} lines"`). (i64) -> a fresh owned Text of
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* its decimal rendering. */
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WO_B_INT_TO_TEXT = 13,
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/* haxe-parity compiler Task 4: enum payload variants. A payload
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* union's variants are compiler-generated class-table entries; the
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* variant TAG is the object header's existing class_id (no new
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* header field, no new flag — docs/plan/oop-vm/00-wob-format.md,
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* "enum payload variants"). (variant object) -> i64 tag: reads
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* r[B]'s header class_id into r[A] so a switch over a payload
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* union compares tags without a per-arm allocation. Traps
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* WO_T_BOUNDS on a null receiver or a native class id — the same
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* defense ICALL keeps for a miscompiled receiver. */
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WO_B_VARIANT_TAG = 14,
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/* haxe-parity compiler Task 5: materialize the caught error. The
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* catch arm's error record is an ordinary compiler-generated class
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* whose field order this builtin is the contract for — (record
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* object) -> the same object, with field 0 = code (i64), 1 = line
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* (i64), 2 = method (fresh owned Text), 3 = msg (fresh owned Text),
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* read from the error the VM landed here with. The compiler
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* allocates and owns the record (so its drop is the ordinary one);
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* the VM only fills it, which is why the pending error never has to
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* outlive the landing. Traps WO_T_BOUNDS on a receiver that is not
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* a 4-field class object, WO_T_OOM if either Text cannot be
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* allocated. */
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WO_B_ERR_FILL = 15,
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/* ---- systems stdlib: text and container surface (the driving
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* workload's own vocabulary — docs/plan/oop-vm/08-builtin-surface.md
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* lists the source spelling of each). Every one that returns a fresh
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* Text or a fresh `multi` allocates it here, so a `?T` result spells
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* absence as 0 like every other nullable. ---- */
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WO_B_LEN = 16, /* (text|multi|map) -> i64 length */
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WO_B_BYTE_AT = 17, /* (text, i) -> i64 byte; out of range traps BOUNDS */
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WO_B_PRINT_ERR = 18, /* (text) -> stderr, newline-terminated */
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WO_B_STARTS_WITH = 19, /* (text, prefix) -> 1/0 */
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WO_B_ENDS_WITH = 20, /* (text, suffix) -> 1/0 */
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WO_B_INDEX_OF = 21, /* (text, needle) -> first byte offset, -1 = absent */
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WO_B_LAST_INDEX_OF = 22, /* (text, needle) -> last byte offset, -1 = absent */
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WO_B_SUBSTR = 23, /* (text, start, len) -> fresh Text, clamped */
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WO_B_TRIM = 24, /* (text) -> fresh Text without leading/trailing space */
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WO_B_TO_LOWER = 25, /* (text) -> fresh Text, ASCII-lowercased */
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WO_B_CHAR_OF = 26, /* (i64) -> fresh one-byte Text */
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WO_B_PARSE_INT = 27, /* (text) -> i64; unparseable is 0, `?Int`'s own nil */
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WO_B_SPLIT = 28, /* (text, sep) -> fresh multi Text */
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WO_B_SPLIT_WS = 29, /* (text) -> fresh multi Text, whitespace-separated */
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WO_B_JOIN = 30, /* (multi Text, sep) -> fresh Text */
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WO_B_SLICE = 31, /* (multi, from, to) -> fresh multi; Text elements are
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* COPIED, so the two containers never share a value */
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WO_B_POP = 32, /* (multi) -> last element, removed; empty traps BOUNDS */
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WO_B_SHIFT = 33, /* (multi) -> first element, removed; empty traps BOUNDS */
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WO_B_SORT = 34, /* (multi) -> 0; in place, Text by content else by value */
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WO_B_REVERSE = 35, /* (multi) -> 0; in place */
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WO_B_MAP_REMOVE = 36, /* (map, key) -> 1/0; drops the removed key and value */
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WO_B_MAP_KEY_AT = 37, /* (map, i) -> key at slot i (insertion order) */
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WO_B_MAP_VAL_AT = 38, /* (map, i) -> value at slot i */
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WO_B_MULTI_SET = 39, /* (multi, i, v) -> 0; in-place element write,
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* dropping the element it replaces. `m[i] = v`
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* for a multi, the mirror of map_set. */
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/* ---- systems stdlib: the OS half (runtime/src/sysio.c). Members that
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* return a record take their result record's CLASS ID as their last
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* argument — the compiler predeclares the record and passes the id, so
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* the VM allocates what it fills without knowing source type names.
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* Field orders are the contract, documented per case in sysio.c. ---- */
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WO_B_FS_EXISTS = 40, /* (path) -> 1/0 */
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WO_B_FS_LIST = 41, /* (dir) -> multi Text; unreadable dir traps IO */
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WO_B_FS_STAT = 42, /* (path, cls) -> ?Stat {size, mtime, inode, dir} */
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WO_B_FS_READ_ALL = 43, /* (path, cap) -> Text, truncated at cap */
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WO_B_FS_READ_AT = 44, /* (path, off, len) -> Text, short read allowed */
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WO_B_FS_APPEND = 45, /* (path, text) -> 0; creates the file if absent */
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WO_B_TIME_SLEEP = 46, /* (ms) -> 0 */
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WO_B_TIME_LOCAL = 47, /* (ms, cls) -> Parts {year..second, dow} */
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WO_B_TIME_ISO = 48, /* (ms) -> Text, UTC seconds precision */
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WO_B_ENV_GET = 49, /* (name) -> ?Text; unset is nil */
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WO_B_ENV_STOPPING = 50, /* () -> 1/0; SIGTERM/SIGINT latch */
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WO_B_NET_LISTEN = 51, /* (host, port) -> fd */
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WO_B_NET_ACCEPT = 52, /* (fd) -> fd */
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WO_B_NET_READ = 53, /* (fd, max) -> Text; empty = EOF */
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WO_B_NET_WRITE = 54, /* (fd, text) -> 0 */
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WO_B_NET_CLOSE = 55, /* (fd) -> 0 */
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WO_B_PROC_RUN = 56, /* (cmd, multi Text args, cls) -> Proc {code, out, err} */
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/* ---- json (runtime/src/json.c): metadata-driven, not per-type code.
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* encode takes the STATIC kind of its argument, because a register alone
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* cannot say whether it holds an i64 or a pointer; everything below the
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* top level comes from object headers and the class table. decode takes
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* the class id to build, and yields nil (0) on malformed input — never a
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* trap, which is what makes `json.decode(t) as T` a checked decode. ---- */
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WO_B_JSON_ENCODE = 57, /* (value, kind) -> Text; kind 255 = the value is a
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* `json.Value`, i.e. raw JSON to emit verbatim */
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WO_B_JSON_DECODE = 58, /* (text, cls) -> ?instance of cls */
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/* `m[k]` on a map is the OPTIONAL read: a missing key is nil, not a trap.
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* `get(m, k)` (WO_B_MAP_GET) stays the asserting form. Indexing a `multi`
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* out of range still traps — a bad index is a fault, not an absence. */
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WO_B_MAP_GET_OPT = 59, /* (map, key) -> value or nil */
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/* (text) -> a fresh copy. Every ownership boundary in this language
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* copies a Text — into a container (push/set), into a field (SETF), and
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* out of a function (`return` of a borrowed place, which is what this id
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* exists for: the callee's borrow must not become the caller's owner). */
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WO_B_TEXT_COPY = 60,
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/* ---- database engine (iteration 9; database/src/db.c) ----
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* DB_INSERT window: R[B] = class id, R[B+1..] = one slot per declared
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* field in declaration order. Result R[A] = the new row's id. Engine
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* failures trap WO_T_DB; a failed WAL commit traps WO_T_IO (the write
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* was applied to RAM but never acknowledged). */
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WO_B_DB_INSERT = 61,
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/* DB_UPDATE_FIELD: R[B] = class id, R[B+1] = row id, R[B+2] = field
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* index, R[B+3] = the value. R[A] = 0. Unique violation traps
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* WO_T_UNIQUE with the row untouched. */
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WO_B_DB_UPDATE_FIELD = 62,
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/* DB_DELETE: R[B] = class id, R[B+1] = row id. R[A] = 0. A missing row
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* traps WO_T_DB (deleting what is not there is a fault, not a no-op). */
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WO_B_DB_DELETE = 63,
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/* the query surface's reads (iteration 9b). A table-class value IS its
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* row id at runtime (the "objects are rows" model), so these are how the
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* compiled query loop touches storage:
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* DB_SCAN (64): R[B] = class -> R[A] = multi<Int> of every id
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* DB_GET_FIELD(65): R[B]=class, R[B+1]=id, R[B+2]=field
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* -> R[A] = that field, decoded to a VM value (a
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* Text field decodes to a fresh Text; a ref field
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* decodes to the target id). Missing row traps
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* WO_T_DB.
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* DB_PROBE (66): R[B]=class, R[B+1]=index, R[B+2]=key
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* -> R[A] = multi<Int> of ids whose first indexed
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* column equals key (backlink + indexed where). */
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WO_B_DB_SCAN = 64,
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WO_B_DB_GET_FIELD = 65,
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WO_B_DB_PROBE = 66,
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WO_B_STR_LT = 67, /* (a, b) text -> 1 if a < b by content, else 0 (query
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* order-by on a Text key; scalars use the LT opcode) */
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};
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#define WO_B_MAX 67u
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/* ids at or above this one live in sysio.c, not builtin.c */
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#define WO_B_SYS_FIRST WO_B_FS_EXISTS
|
||
|
||
/* json.encode's "this is already JSON" kind (a `json.Value`): not a field
|
||
* kind, only an argument marker. */
|
||
#define WO_JSON_KIND_RAW 255u
|
||
|
||
/* ---- instruction encode/decode: op:8 A:8 then B:8 C:8 or Bx:16 ---- */
|
||
static inline uint32_t wo_ins_abc(uint8_t op, uint8_t a, uint8_t b, uint8_t c) {
|
||
return (uint32_t)op | ((uint32_t)a << 8) | ((uint32_t)b << 16) | ((uint32_t)c << 24);
|
||
}
|
||
static inline uint32_t wo_ins_abx(uint8_t op, uint8_t a, uint16_t bx) {
|
||
return (uint32_t)op | ((uint32_t)a << 8) | ((uint32_t)bx << 16);
|
||
}
|
||
/* signed jumps: sBx encodes as Bx - 32768 */
|
||
static inline uint32_t wo_ins_asbx(uint8_t op, uint8_t a, int32_t sbx) {
|
||
return wo_ins_abx(op, a, (uint16_t)(sbx + 32768));
|
||
}
|
||
static inline uint8_t wo_ins_op(uint32_t i) { return (uint8_t)(i & 0xFFu); }
|
||
static inline uint8_t wo_ins_a(uint32_t i) { return (uint8_t)((i >> 8) & 0xFFu); }
|
||
static inline uint8_t wo_ins_b(uint32_t i) { return (uint8_t)((i >> 16) & 0xFFu); }
|
||
static inline uint8_t wo_ins_c(uint32_t i) { return (uint8_t)((i >> 24) & 0xFFu); }
|
||
static inline uint16_t wo_ins_bx(uint32_t i) { return (uint16_t)(i >> 16); }
|
||
static inline int32_t wo_ins_sbx(uint32_t i) { return (int32_t)wo_ins_bx(i) - 32768; }
|
||
|
||
/* ---- class descriptor shared by loader and runtime ---- */
|
||
typedef struct wo_classdesc {
|
||
uint32_t name; /* constant index of the class name */
|
||
uint32_t flags; /* bit0: instances are @gc */
|
||
uint32_t field_cnt;
|
||
const uint8_t *kinds; /* field_cnt kind bytes, declaration order */
|
||
/* v2 per-field metadata, field_cnt entries each — see the
|
||
* "class-table field metadata" note above. Both may be NULL for a
|
||
* class an image wrote with no metadata at all. */
|
||
const uint32_t *field_names; /* constant index of each field's name */
|
||
const uint32_t *field_class; /* referenced class id / JSON_RAW / NONE */
|
||
const uint32_t *field_elem; /* container element kinds */
|
||
/* v3 (iteration 9 Task 4): the class's secondary indexes, flat-encoded
|
||
[flags, col_cnt, col...]* — flags bit0 = unique. idx_cnt entries.
|
||
Columns are field indices, scalar/Text kinds only (loader-checked). */
|
||
uint32_t idx_cnt;
|
||
const uint32_t *idx_meta;
|
||
} wo_classdesc;
|
||
#define WO_CLASSF_GC 0x01u
|
||
|
||
/* runtime object layout: 16-byte header then one 8-byte slot per field */
|
||
static inline size_t wo_obj_size(const wo_classdesc *c) {
|
||
return sizeof(wo_hdr) + (size_t)c->field_cnt * 8u;
|
||
}
|
||
static inline uint64_t *wo_fields(wo_hdr *o) { return (uint64_t *)(o + 1); }
|
||
|
||
#endif /* WO_WOB_H */
|