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revert(v4.0.0): step 6d, the wait, is backed out -- two reviews found it unsound

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Ruled 2026-10-08.  The engine, the nucleus and their tests are as they
were at dfabfa46, before step 6d; the code of the wait and its tests are
in history at 075385ab..2cf37aab.  The limit of MESH.md 7b.7 stands: a
node that is stuck can hold up its neighbours until Hera kills it.

MESH.md 7c is kept as the record of the design as approved, and 7c.6 says
what was built, what the two reviews found, the cause the findings share
-- a node's message machinery runs on the stacks its text is using, and a
fault abandons whatever was in progress -- and what a second attempt
must settle before anything is built.

Kept from it, in hosted-check: a line that leaves 29 values on the stack,
and WORDS with 26 values on it.  Both hung the products at some commit of
the wait.

make -C v4 test and sanitize at both widths, hosted-check, lint; three
bare-metal boots typing both.  POST 538 of 538, word_count=317,
dict_hash=0xc0769523a47b7dc3 on all six: the hash of step 6c's code.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-08 07:31:40 -04:00
co-authored by Claude Opus 5.5
parent 10f5ffd00b
commit 6015c87157
20 changed files with 1108 additions and 1203 deletions
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v4/tests/host_map.h
+1 -19
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@@ -73,7 +73,7 @@
#define OWED (BUF0_W - 112) /* those: for each, the node it is owed to and the node the refused message was for */
#define ACL_HOOK (BUF0_W - 6) /* the xt of the access control recheck word, or 0 */
#define LINE_STATUS (BUF0_W - 9) /* how the last line ended: 0 QUIT, 1 completed, 2 an error */
#define PORT (BUF0_W - 144) /* the node's ports (node.h): V4_PORTS of them, then "any port", "which port", who writes, who reads, an offer for each port, and the two waits: 2 * V4_PORTS + 6 cells, between the output buffer and A_FOUND. Port 0 is where its requests go. */
#define PORT (BUF0_W - 32) /* the node's ports (node.h): V4_PORTS of them, then "any port" and "which port". Port 0 is where its requests go. */
#define CONSOLE (BUF0_W - 16) /* the node what this one prints is sent to; 0: whoever sent the text being served */
#define ROUTE_COUNT (BUF0_W - 17) /* how many entries the table of ways holds */
#define ROUTE_DEFAULT (BUF0_W - 18) /* the port address for a node not in the table, or 0: there is none */
@@ -87,12 +87,6 @@
#define MQ_TAIL (BUF0_W - 36) /* where the next will go, */
#define MQ_COUNT (BUF0_W - 37) /* and how many cells they take */
#define AWAIT_FROM (BUF0_W - 39) /* the node whose word of how text ended is waited for */
#define W_GONE (BUF0_W - 122) /* not 0: the port a message was being written to has nothing on it; its other words are let go */
#define TAKING (BUF0_W - 121) /* not 0: a message is being taken in, and is only partly with the messages waiting; */
#define T_TAIL (BUF0_W - 120) /* where they ended before it, */
#define T_COUNT (BUF0_W - 119) /* and how many cells they took */
#define GATE_WORD (BUF0_W - 32) /* the first word of a message that is being offered */
#define PAY_K (BUF0_W - 31) /* for each port, which refusal owed is offered there, counted from 1; 0: none. V4_PORTS cells */
#define GATE_PORT (BUF0_W - 38) /* the port address a message is about to be begun on */
#define NEAR (BUF0_W - 64) /* for each port, the number of the node on the other end; 0: not told */
#define MQ_HDR (BUF0_W - 56) /* a message being taken in: its seven words and the port it came on */
@@ -130,8 +124,6 @@ typedef char host_map_ports_fit[(V4_PORTS <= 8u) ? 1 : -1];
#endif
/* the messages waiting are above the dictionary */
typedef char host_map_queue_fits[(MQ_W >= DICT_END_W) ? 1 : -1];
/* the ports, with the offers and the wait after them, end below the cells that follow */
typedef char host_map_port_block_fits[(PORT + 2 * (v4_cell)V4_PORTS + 6 <= W_GONE && PAY_K + (v4_cell)V4_PORTS <= PRINT_TO) ? 1 : -1];
/* How many slots, from slot 0, a branch may sit in on a node this size: those
* whose address field reaches every word of it. */
@@ -204,16 +196,6 @@ static int host_load(v4_text *tx, v4_node *n, const char *const *files, unsigned
v4_text_constant(tx, "-PORTS", -(v4_cell)V4_PORTS);
v4_text_constant(tx, "(NEAR)", NEAR);
v4_text_constant(tx, "(GATE-PORT)", GATE_PORT);
v4_text_constant(tx, "(GATE-WORD)", GATE_WORD);
v4_text_constant(tx, "(PAY-K)", PAY_K);
v4_text_constant(tx, "PORTS-1", (v4_cell)V4_PORTS - 1);
v4_text_constant(tx, "(OFFER)", PORT + (v4_cell)V4_PORT_OFFER);
v4_text_constant(tx, "(WAIT)", PORT + (v4_cell)V4_PORT_WAIT);
v4_text_constant(tx, "(WAIT1)", PORT + (v4_cell)V4_PORT_WAIT1);
v4_text_constant(tx, "(W-GONE)", W_GONE);
v4_text_constant(tx, "(TAKING)", TAKING);
v4_text_constant(tx, "(T-TAIL)", T_TAIL);
v4_text_constant(tx, "(T-COUNT)", T_COUNT);
v4_text_constant(tx, "(AWAIT-FROM)", AWAIT_FROM);
v4_text_constant(tx, "(MQ)", MQ_W);
v4_text_constant(tx, "(MQ-END)", MQ_W + MQ_CELLS);