From 2b53bca326decd50012883f0cff3b5316a3e100d Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Tue, 19 Oct 2021 13:28:01 -0700
Subject: feat(rc): prototype of async jobs

---
 sys/cmd/rc/code.c | 29 ++++++++++++-----------------
 1 file changed, 12 insertions(+), 17 deletions(-)

(limited to 'sys/cmd/rc/code.c')

diff --git a/sys/cmd/rc/code.c b/sys/cmd/rc/code.c
index c98cde2..719e63b 100644
--- a/sys/cmd/rc/code.c
+++ b/sys/cmd/rc/code.c
@@ -30,7 +30,7 @@ grow(void)
 
 static
 void
-stashaddr(int a)
+storepc(int a)
 {
     if(interpreter.i <= a || a < 0)
         fatal("bad address %d in interpreter", a);
@@ -42,8 +42,8 @@ static
 void
 walk(Tree *node)
 {
-    int p;
     Tree *n;
+    int addr;
 
     if(!node)
         return;
@@ -72,17 +72,6 @@ walk(Tree *node)
         emitf(Xflat);
         break;
 
-    case Tindex:
-
-#if 0
-    case '&':
-        emitf(Xasync);
-        p = emiti(0);
-        emitf(Xexit);
-        stashaddr(p);
-        break;
-#endif
-
     case ';':
         walk(node->child[0]);
         walk(node->child[1]);
@@ -113,6 +102,14 @@ walk(Tree *node)
         emitf(Xbasic);
         break;
 
+    case '&':
+        emitf(Xasync);
+        addr = emiti(0);
+        walk(node->child[0]);
+        emitf(Xexit);
+        storepc(addr);
+        break;
+
     case Tword:
         emitf(Xword);
         emits(strdup(node->str));
@@ -173,18 +170,16 @@ int
 compile(Tree *node)
 {
     flush(shell.err);
-    //print(errio, "%t\n", node);
 
     interpreter.i    = 0;
     interpreter.code = emalloc(100*sizeof(*interpreter.code)); 
-
-    emiti(1); // reference count
+    emiti(0); // reference count: no thread owns code yet
 
     walk(node);
 
     emitf(Xreturn);
     emitf(nil);
 
-    compiled =  interpreter.code;
+    compiled = interpreter.code;
     return 0;
 }
-- 
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