From ce05175372a9ddca1a225db0765ace1127a39293 Mon Sep 17 00:00:00 2001
From: Nicholas <nbnoll@eml.cc>
Date: Fri, 12 Nov 2021 09:22:01 -0800
Subject: chore: simplified organizational structure

---
 sys/cmd/rc/code.c | 277 ------------------------------------------------------
 1 file changed, 277 deletions(-)
 delete mode 100644 sys/cmd/rc/code.c

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

diff --git a/sys/cmd/rc/code.c b/sys/cmd/rc/code.c
deleted file mode 100644
index 786f284..0000000
--- a/sys/cmd/rc/code.c
+++ /dev/null
@@ -1,277 +0,0 @@
-#include "rc.h"
-#include "parse.h"
-#include "exec.h"
-
-// -----------------------------------------------------------------------
-// types
-
-struct Interpreter
-{
-    int i, cap;
-    Code  *code;
-};
-
-Code *compiled = nil;
-static struct Interpreter interpreter;
-#define emiti(x) ((void)(interpreter.i != interpreter.cap || grow()), interpreter.code[interpreter.i].i = (x), interpreter.i++)
-#define emitf(x) ((void)(interpreter.i != interpreter.cap || grow()), interpreter.code[interpreter.i].f = (x), interpreter.i++)
-#define emits(x) ((void)(interpreter.i != interpreter.cap || grow()), interpreter.code[interpreter.i].s = (x), interpreter.i++)
-
-static
-int
-grow(void)
-{
-    interpreter.cap += 100;
-    interpreter.code = erealloc(interpreter.code, sizeof(*interpreter.code)*interpreter.cap);
-    memset(interpreter.code+interpreter.cap-100, 0, 100*sizeof(*interpreter.code));
-
-    return 0;
-}
-
-static
-void
-storepc(int a)
-{
-    if(interpreter.i <= a || a < 0)
-        fatal("bad address %d in interpreter", a);
-
-    interpreter.code[a].i = interpreter.i;
-}
-
-static
-void
-walk(Tree *node)
-{
-    Tree *n;
-    int addr1, addr2;
-
-    if(!node)
-        return;
-
-    switch(node->type){
-    default:
-        print(shell.err, "bad type %d in interpreter walk\n", node->type);
-        fatal("crashing\n");
-        break;
-
-    case '$':
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xdollar);
-        break;
-
-    case Tcount:
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xcount);
-        break;
-
-    case Tjoin:
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xjoin);
-        break;
-
-    case Tindex:
-        emitf(Xmark);
-        walk(node->child[1]);
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xindex);
-        break;
-
-    case ';':
-        walk(node->child[0]);
-        walk(node->child[1]);
-        break;
-
-    case '^':
-        emitf(Xmark);
-        walk(node->child[1]);
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xconcatenate);
-        break;
-
-    case Tandand:
-        walk(node->child[0]);
-        emitf(Xtrue);
-        addr1 = emiti(0);
-        walk(node->child[1]);
-        storepc(addr1);
-        break;
-
-    case Toror:
-        walk(node->child[0]);
-        emitf(Xfalse);
-        addr1 = emiti(0);
-        walk(node->child[1]);
-        storepc(addr1);
-        break;
-
-    case Targs:
-        walk(node->child[1]);
-        walk(node->child[0]);
-        break;
-
-    case Tparen: case Tblock:
-        walk(node->child[0]);
-        break;
-
-    case Tbasic:
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xbasic);
-        break;
-
-    case Tbang:
-        walk(node->child[0]);
-        emitf(Xbang);
-
-    case Tword:
-        emitf(Xword);
-        emits(strdup(node->str));
-        break;
-
-    case Twords:
-        walk(node->child[1]);
-        walk(node->child[0]);
-        break;
-
-    case '=':
-        for(n=node; node && node->type == '='; node = node->child[2])
-            ;
-        if(node){
-            for(node=n; node->type=='='; node = node->child[2]){
-                emitf(Xmark);
-                walk(node->child[1]);
-                emitf(Xmark);
-                walk(node->child[0]);
-                emitf(Xlocal);
-            }
-            walk(node);
-            for(node=n; node->type=='='; node = node->child[2])
-                emitf(Xunlocal);
-        }else{
-            for(node=n; node; node=node->child[2]){
-                emitf(Xmark);
-                walk(node->child[1]);
-                emitf(Xmark);
-                walk(node->child[0]);
-                emitf(Xassign);
-            }
-        }
-        node = n;
-        break;
-    /* control structures */
-    case Twhile:
-        addr1 = interpreter.i; // head of loop
-        walk(node->child[0]);
-        if(addr1 == interpreter.i)
-            fatal("TODO");
-        emitf(Xtrue);
-        addr2 = emiti(0); // goto end of loop
-
-        walk(node->child[1]);
-        emitf(Xgoto);
-        emiti(addr1);   // goto top of loop
-        storepc(addr2);
-        break;
-
-    case Tfor:
-        emitf(Xmark);
-        if(node->child[1]){ // for( x in X )
-            walk(node->child[1]);
-            // emitf(Xglob)
-        }else{              // for(X)
-            fatal("TODO");
-        }
-        emitf(Xmark); // null initial value for Xlocal
-        emitf(Xmark);
-        walk(node->child[0]);
-        emitf(Xlocal);
-
-        addr1 = emitf(Xfor);
-        addr2 = emiti(0);
-
-        walk(node->child[2]);
-        emitf(Xgoto);
-        emiti(addr1);
-        storepc(addr2);
-        emitf(Xunlocal);
-        break;
-
-    /* forks */
-    case '&':
-        emitf(Xasync);
-        addr1 = emiti(0);
-        walk(node->child[0]);
-        emitf(Xexit);
-        storepc(addr1);
-        break;
-
-    case Tsubshell:
-        emitf(Xsubshell);
-        addr1 = emiti(0);
-        walk(node->child[0]);
-        emitf(Xexit);
-        storepc(addr1);
-        break;
-
-    case Tpipe:
-        emitf(Xpipe);
-
-        emiti(node->redir.fd[0]);
-        emiti(node->redir.fd[1]);
-        addr1 = emiti(0);
-        addr2 = emiti(0);
-
-        walk(node->child[0]);
-        emitf(Xexit);
-        storepc(addr1);
-
-        walk(node->child[1]);
-        emitf(Xreturn);
-        storepc(addr2);
-
-        emitf(Xpipewait);
-
-        break;
-    }
-}
-
-// -----------------------------------------------------------------------
-// main exports
-
-void
-freecode(Code *c)
-{
-    if(--c[0].i!=0)
-        return;
-    efree(c);
-}
-
-Code *
-copycode(Code *c)
-{
-    c[0].i++;
-    return c;
-}
-
-int
-compile(Tree *node)
-{
-    flush(shell.err);
-
-    interpreter.i    = 0;
-    interpreter.code = emalloc(100*sizeof(*interpreter.code)); 
-    emiti(0); // reference count: no thread owns code yet
-
-    walk(node);
-
-    emitf(Xreturn);
-    emitf(nil);
-
-    compiled = interpreter.code;
-    return 0;
-}
-- 
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