a

1 files changed, 27 insertions, 0 deletions

diff --git a/src/runtime/run.zc b/src/runtime/run.zc
new file mode 100644
index 0000000..60193a7
--- /dev/null
+++ b/src/runtime/run.zc
@@ -0,0 +1,27 @@
+// run-only image: the runtime, a collector root set, and start. there is no
+// resident compiler and none of its tables. put this between rt.zc and a
+// program that defines main, and compile with zc0 (the program has to stay in
+// the stage-0 subset: no types, no quote, no parse words).
+//
+//   cat build/run/rt.zc src/runtime/run.zc examples/hello.zc | ./zc0 >build/run/genome.h
+
+// the program's entry point, written by the program (see start).
+int main();
+
+// the collector's roots: the code and globals, the program's frames and the
+// operand stack. the collector marks from these before it frees anything.
+int gc_roots() {
+	markrange(0, CODE_END);
+	markrange(GORG, GORG[6]);
+	gc_frames();
+	markrange(dsp(), data_top);
+	return 0;
+}
+
+// the first code a run-only image executes: it sets up the heap, runs main and halts.
+int start() {
+	heap_init();
+	main();
+	halt();
+	return 0;
+}