build: embed images with #embed, keep everything generated in build/

the cores take their genome in with c23 #embed through src/core/genome.h,
so images are plain little-endian word files (genome.bin) instead of
generated c headers. zc0 writes that format, mkgenome checks an image
against its map and shows a compiler's diagnostics when it gets them,
and the javascript vm and the editor's vm host read the same files.
src/tools/findcc.sh picks a compiler with #embed (clang 19 or gcc 15).

zc gets an embed declaration, embed "file" as [type] name, for globals
and locals: a byte string by default, char*, numbers read little-endian,
and arrays of numbers. the compiler and language server carry their
library and source texts through it, so embed.sh and the text it
spliced into compiler.zc are gone.

make writes executables to build/bin, the default map to build/core/map,
the web page to build/web and the extension staging to build/vsix, and
the genome now rebuilds when its sources change. the test suite lays
out its own map and bootstrap and reads nothing from build/.

also: rt.put_s of a byte string in zc0 images, retained function
sources no longer count as live objects, a missing include no longer
cascades into undefined-name errors, consecutive comment lines join
into one hover paragraph, and stale test fixtures follow the include
format.

1 files changed, 16 insertions, 6 deletions

diff --git a/src/js/tinyvm.ts b/src/js/tinyvm.ts
index 4b4bc39..56fab70 100644
--- a/src/js/tinyvm.ts
+++ b/src/js/tinyvm.ts
@@ -10,7 +10,7 @@ declare const process: any, require: any, module: any, __dirname: string, Buffer
 const fs: any = typeof require === 'function' ? require('fs') : undefined;
 const path: any = typeof require === 'function' ? require('path') : undefined;
 
-// the compiler's map, computed from src/core/memmap.h at build time (build/js/layout.js)
+// the compiler's map, computed from build/core/map/memmap.h at build time (build/js/layout.js)
 import { MAP } from './layout';
 
 // float bits stay in vm words; arithmetic uses javascript's binary64 numbers.
@@ -257,6 +257,16 @@ export class TinyVM {
         }
     }
 
+    /** load an image file's bytes (little-endian 64-bit words, the format the c cores
+        #embed) at org. returns the number of words. */
+    public loadImage(bytes: Uint8Array, org: number = this.L.GORG): number {
+        if (bytes.length % 8) throw new RangeError('an image is a whole number of 64-bit words');
+        const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.length);
+        const n = bytes.length / 8;
+        for (let i = 0; i < n; i++) this.mem[org + i] = view.getBigInt64(i * 8, true);
+        return n;
+    }
+
     public getOutput(): string {
         return new TextDecoder().decode(new Uint8Array(this.outputBuffer));
     }
@@ -931,13 +941,13 @@ if (typeof require === 'function' && typeof module !== 'undefined' && require.ma
         process.stderr.write('tinyvm.js: unknown option ' + option + '; use --help for usage\n');
         process.exit(2);
     }
-    const genomePath = path.join(__dirname, 'genome.json');
+    const genomePath = path.join(__dirname, 'genome.bin');
     if (!fs.existsSync(genomePath)) {
-        console.error('Error: genome.json not found. Run extract_genome.js first.');
+        console.error('Error: genome.bin not found beside tinyvm.js. Run make js first.');
         process.exit(1);
     }
 
-    const genomeData = JSON.parse(fs.readFileSync(genomePath, 'utf8'));
+    const genome: Uint8Array = fs.readFileSync(genomePath);
     let inputSource = '';
 
     if (process.argv.length > 2) {
@@ -970,9 +980,9 @@ if (typeof require === 'function' && typeof module !== 'undefined' && require.ma
         onMessage: (msg: string) => process.stderr.write(msg)
     });
 
-    vm.loadGenome(genomeData.words, genomeData.gorg);
+    vm.loadImage(genome, GORG);
     vm.setInput(inputSource);
-    const code = vm.run(genomeData.gorg);
+    const code = vm.run(GORG);
     process.exit(code);
 }