Gen: stackptr for var.stackloc

gen.c

@@ -2,8 +2,10 @@
 
 Gen gen_new(void)
 {
-	Gen gen;
-	gen.labelno=0;
+	Gen gen={
+		.labelno=0,
+		.stackptr=NULL,
+	};
 	return gen;
 }
 

gen.h

@@ -6,10 +6,12 @@
 #pragma once
 
 #include"mem.h"
+#include"pnode.h"
 
 typedef struct Gen
 {
 	size_t labelno;
+	const PNode*stackptr;
 } Gen;
 
 Gen gen_new(void);

x86_64.c

@@ -31,6 +31,7 @@ void gen_x86_64(Gen*gen,const PNode*pn,FILE*file)
 					err_log("%u: nested function declaration",pn->firstline);
 				fprintf(file,"global %s\n%s:\n",vec_at(&pn->tokens,0,const Tok*)->str.buffer,vec_at(&pn->tokens,0,const Tok*)->str.buffer);
 
+				gen->stackptr=pn;
 				size_t stacksize=gen_x86_64_stacksize(pn);
 				gen_x86_64_prolog(pn,file,stacksize);
 				for(size_t i=0;i<pn->pnodes.size;++i)