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feat(v4.0.0): nodes that talk -- ports, a node born empty, and the fabric

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MESH.md step 1, in the engine, which knows nothing of StarForth or of any
kernel.

- node: V4_PORTS ports (8), a build parameter; "any port" and the port the
  last such read came from; a read blocks until the neighbour writes, as a
  write blocks until the neighbour reads; v4_node_born: empty, P at "any
  port"
- exec: a fetch from a port -- @ @b @+ @p, or of an instruction word when P
  is a port -- waits for a word; a node executes what arrives at a port
  without advancing P; a blocked node goes on from the slot it stopped at
- fabric: the nodes there are and the table of how their ports are wired,
  both changed while the nodes run; devices on a port; asleep and awake; a
  step is every unblocked node executing one instruction word, then every
  write with a reader waiting being handed over
- DECOMPOSITION.md section 6: four named ports withdrawn for V4_PORTS
  numbered ones and wiring as data, as ruled

Verified: tests/test_fabric.c, 53 checks at both widths: two nodes exchange
words; an empty node is filled through its port by a device, and by another
node, and runs what it was sent; a word is passed on by a node in between;
a waiting node executes nothing; the wiring is changed while they run; a
node is put to sleep, woken and removed while looping; a node is born while
others run; the fabric is given more room.  make -C v4 test and make -C v4
sanitize pass.  The single-node products are unchanged: hosted-check on
three ISAs, and clean qemu with STARFORTH_V4=1 on amd64, aarch64 and
riscv64 with lines typed at each prompt (logs/20261006-074907, -075150,
-075532).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-06 07:58:00 -04:00
co-authored by Claude Opus 5.5
parent 2c5427d9c1
commit 9af442f793
17 changed files with 1170 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files
v4/src/node.c
+63 -5
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@@ -120,9 +120,18 @@ void v4_node_store(v4_node *n, v4_cell addr, v4_cell value)
n->console_dropped++;
return;
}
/* The port: the node keeps what it wrote and is blocked until its
* neighbour has taken it. -1 when no port is attached. */
if (addr == n->port) { n->request = value; n->asking = 1; return; }
/* A port: the node keeps what it wrote and is blocked until its
* neighbour has taken it. */
{
int port = v4_node_port_index(n, addr);
if (port >= 0 && port < (int)V4_PORTS) {
n->request = value;
n->ask_port = (unsigned)port;
n->asking = 1;
return;
}
if (port >= 0) { v4_node_fault(n, V4_FAULT_ADDRESS, addr); return; } /* "any" and "which port" are not written to */
}
/* The stack registers: a store empties the stack. -1 when not attached. */
if (addr == n->dstack_reg) { v4_dstack_clear(&n->ds); return; }
if (addr == n->rstack_reg) { v4_rstack_clear(&n->rs); return; }
@@ -147,6 +156,17 @@ v4_cell v4_node_fetch(v4_node *n, v4_cell addr)
if (n->input_pos == n->input_len) n->input_pos = n->input_len = 0;
return c;
}
{
int port = v4_node_port_index(n, addr);
if (port == (int)V4_PORTS + 1) return (v4_cell)n->last_from;
if (port >= 0) {
/* the word its neighbour wrote; v4_node_read_ready has said it is there */
if (!n->given) return 0;
n->given = 0;
if (port == (int)V4_PORT_ANY) n->last_from = n->given_port;
return n->given_value;
}
}
if (addr == n->dstack_reg) return (v4_cell)n->ds.depth;
if (addr == n->rstack_reg) return (v4_cell)n->rs.depth;
return v4_node_load(n, addr);
@@ -182,11 +202,49 @@ void v4_node_console_attach(v4_node *n, v4_cell addr)
n->console_dropped = 0;
}
void v4_node_port_attach(v4_node *n, v4_cell addr)
void v4_node_port_attach(v4_node *n, v4_cell base)
{
n->port = addr;
n->port = base;
n->asking = 0;
n->request = 0;
n->ask_port = 0;
n->reading = 0;
n->read_port = 0;
n->given = 0;
n->given_value = 0;
n->given_port = 0;
n->last_from = 0;
}
int v4_node_port_index(const v4_node *n, v4_cell addr)
{
if (n->port < 0 || addr < n->port || addr > n->port + (v4_cell)V4_PORTS + 1) return -1;
return (int)(addr - n->port);
}
int v4_node_read_ready(v4_node *n, v4_cell addr)
{
int port = v4_node_port_index(n, addr);
if (port < 0 || port == (int)V4_PORTS + 1) return 1;
if (n->given && (port == (int)V4_PORT_ANY || (unsigned)port == n->given_port)) return 1;
n->reading = 1;
n->read_port = (unsigned)port;
return 0;
}
void v4_node_port_give(v4_node *n, unsigned port, v4_cell value)
{
n->given = 1;
n->given_value = value;
n->given_port = port;
n->reading = 0;
}
void v4_node_born(v4_node *n, v4_cell base)
{
v4_node_reset(n);
v4_node_port_attach(n, base);
n->p = base + (v4_cell)V4_PORT_ANY;
}
void v4_node_port_served(v4_node *n)