shithub: femtolisp

Download patch

ref: a7bae3835d8f73f5ad2a6fbaec4bd650cd0c1dea
parent: 4531f42eb7ae46af10997d0583d3e3e113e59d1d
author: Sigrid Solveig Haflínudóttir <sigrid@ftrv.se>
date: Sun Nov 10 14:22:30 EST 2024

more renames and rearrangement

--- a/cvalues.c
+++ b/cvalues.c
@@ -16,13 +16,13 @@
 {
 	if(FL(nfinalizers) == FL(maxfinalizers)){
 		size_t nn = FL(maxfinalizers) == 0 ? 256 : FL(maxfinalizers)*2;
-		cvalue_t **temp = LLT_REALLOC(FL(Finalizers), nn*sizeof(cvalue_t*));
+		cvalue_t **temp = LLT_REALLOC(FL(finalizers), nn*sizeof(cvalue_t*));
 		if(temp == nil)
 			lerrorf(FL(MemoryError), "out of memory");
-		FL(Finalizers) = temp;
+		FL(finalizers) = temp;
 		FL(maxfinalizers) = nn;
 	}
-	FL(Finalizers)[FL(nfinalizers)++] = cv;
+	FL(finalizers)[FL(nfinalizers)++] = cv;
 }
 
 // remove dead objects from finalization list in-place
@@ -29,7 +29,7 @@
 void
 sweep_finalizers(void)
 {
-	cvalue_t **lst = FL(Finalizers);
+	cvalue_t **lst = FL(finalizers);
 	size_t n = 0, ndel = 0, l = FL(nfinalizers);
 	cvalue_t *tmp;
 #define SWAP_sf(a, b) (tmp = a, a = b, b = tmp, 1)
@@ -252,7 +252,7 @@
 	{ \
 		if(nargs == 0){ \
 			PUSH(fixnum(0)); \
-			args = &FL(Stack)[FL(SP)-1]; \
+			args = &FL(stack)[FL(sp)-1]; \
 		} \
 		value_t cp = cprim(FL(typenam##type), sizeof(ctype)); \
 		if(cvalue_##ctype##_init(FL(typenam##type), args[0], cp_data((cprim_t*)ptr(cp)))) \
@@ -314,7 +314,7 @@
 {
 	if(nargs == 0){
 		PUSH(fixnum(0));
-		args = &FL(Stack)[FL(SP)-1];
+		args = &FL(stack)[FL(sp)-1];
 	}
 	value_t cv = cvalue(FL(mpinttype), sizeof(mpint*));
 	if(cvalue_mpint_init(FL(mpinttype), args[0], cv_data((cvalue_t*)ptr(cv))))
--- a/flisp.c
+++ b/flisp.c
@@ -55,13 +55,13 @@
 
 #define FL_TRY \
 	fl_exception_context_t _ctx; int l__tr, l__ca; \
-	_ctx.sp = FL(SP); _ctx.frame = FL(curr_frame); _ctx.rdst = FL(readstate); _ctx.prev = FL(exctx); \
-	_ctx.ngchnd = FL(N_GCHND); FL(exctx) = &_ctx; \
+	_ctx.sp = FL(sp); _ctx.frame = FL(curr_frame); _ctx.rdst = FL(readstate); _ctx.prev = FL(exctx); \
+	_ctx.ngchnd = FL(ngchandles); FL(exctx) = &_ctx; \
 	if(!setjmp(_ctx.buf)) \
 		for(l__tr = 1; l__tr; l__tr = 0, (void)(FL(exctx) = FL(exctx)->prev))
 
 #define FL_CATCH_INC \
-	l__ca = 0, FL(lasterror) = FL(Nil), FL(throwing_frame) = 0, FL(SP) = _ctx.sp, FL(curr_frame) = _ctx.frame
+	l__ca = 0, FL(lasterror) = FL(Nil), FL(throwing_frame) = 0, FL(sp) = _ctx.sp, FL(curr_frame) = _ctx.frame
 
 #define FL_CATCH \
 	else \
@@ -74,11 +74,11 @@
 void
 fl_savestate(fl_exception_context_t *_ctx)
 {
-	_ctx->sp = FL(SP);
+	_ctx->sp = FL(sp);
 	_ctx->frame = FL(curr_frame);
 	_ctx->rdst = FL(readstate);
 	_ctx->prev = FL(exctx);
-	_ctx->ngchnd = FL(N_GCHND);
+	_ctx->ngchnd = FL(ngchandles);
 }
 
 void
@@ -86,7 +86,7 @@
 {
 	FL(lasterror) = FL(Nil);
 	FL(throwing_frame) = 0;
-	FL(SP) = _ctx->sp;
+	FL(sp) = _ctx->sp;
 	FL(curr_frame) = _ctx->frame;
 }
 
@@ -101,7 +101,7 @@
 	}
 	if(FL(throwing_frame) == 0)
 		FL(throwing_frame) = FL(curr_frame);
-	FL(N_GCHND) = FL(exctx)->ngchnd;
+	FL(ngchandles) = FL(exctx)->ngchnd;
 	fl_exception_context_t *thisctx = FL(exctx);
 	if(FL(exctx)->prev)   // don't throw past toplevel
 		FL(exctx) = FL(exctx)->prev;
@@ -213,7 +213,7 @@
 	argcount(nargs, 0);
 	USED(args);
 	gensym_t *gs = alloc_words(sizeof(gensym_t)/sizeof(void*));
-	gs->id = FL(_gensym_ctr)++;
+	gs->id = FL(gensym_ctr)++;
 	gs->binding = UNBOUND;
 	gs->isconst = 0;
 	gs->type = nil;
@@ -318,16 +318,16 @@
 void
 fl_gc_handle(value_t *pv)
 {
-	if(__unlikely(FL(N_GCHND) >= N_GC_HANDLES))
+	if(__unlikely(FL(ngchandles) >= N_GC_HANDLES))
 		lerrorf(FL(MemoryError), "out of gc handles");
-	FL(GCHandleStack)[FL(N_GCHND)++] = pv;
+	FL(gchandles)[FL(ngchandles)++] = pv;
 }
 
 void
 fl_free_gc_handles(uint32_t n)
 {
-	assert(FL(N_GCHND) >= n);
-	FL(N_GCHND) -= n;
+	assert(FL(ngchandles) >= n);
+	FL(ngchandles) -= n;
 }
 
 value_t
@@ -457,21 +457,21 @@
 
 	if(FL(throwing_frame) > FL(curr_frame)){
 		top = FL(throwing_frame) - 4;
-		f = FL(Stack)[FL(throwing_frame)-4];
+		f = FL(stack)[FL(throwing_frame)-4];
 	}else{
-		top = FL(SP);
+		top = FL(sp);
 		f = FL(curr_frame);
 	}
 	while(1){
 		for(i = f; i < top; i++)
-			FL(Stack)[i] = relocate(FL(Stack)[i]);
+			FL(stack)[i] = relocate(FL(stack)[i]);
 		if(f == 0)
 			break;
 		top = f - 4;
-		f = FL(Stack)[f-4];
+		f = FL(stack)[f-4];
 	}
-	for(i = 0; i < FL(N_GCHND); i++)
-		*FL(GCHandleStack)[i] = relocate(*FL(GCHandleStack)[i]);
+	for(i = 0; i < FL(ngchandles); i++)
+		*FL(gchandles)[i] = relocate(*FL(gchandles)[i]);
 	trace_globals(FL(symtab));
 	relocate_typetable();
 	rs = FL(readstate);
@@ -528,12 +528,12 @@
 static void
 grow_stack(void)
 {
-	size_t newsz = FL(N_STACK) * 2;
-	value_t *ns = LLT_REALLOC(FL(Stack), newsz*sizeof(value_t));
+	size_t newsz = FL(nstack) * 2;
+	value_t *ns = LLT_REALLOC(FL(stack), newsz*sizeof(value_t));
 	if(__unlikely(ns == nil))
 		lerrorf(FL(MemoryError), "stack overflow");
-	FL(Stack) = ns;
-	FL(N_STACK) = newsz;
+	FL(stack) = ns;
+	FL(nstack) = newsz;
 }
 
 // utils ----------------------------------------------------------------------
@@ -542,11 +542,11 @@
 static value_t
 _applyn(uint32_t n)
 {
-	value_t f = FL(Stack)[FL(SP)-n-1];
-	uint32_t saveSP = FL(SP);
+	value_t f = FL(stack)[FL(sp)-n-1];
+	uint32_t saveSP = FL(sp);
 	value_t v;
 	if(iscbuiltin(f)){
-		v = ((builtin_t*)ptr(f))[3](&FL(Stack)[FL(SP)-n], n);
+		v = ((builtin_t*)ptr(f))[3](&FL(stack)[FL(sp)-n], n);
 	}else if(isfunction(f)){
 		v = apply_cl(n);
 	}else if(__likely(isbuiltin(f))){
@@ -553,12 +553,12 @@
 		value_t tab = symbol_value(FL(builtins_table_sym));
 		if(__unlikely(ptr(tab) == nil))
 			unbound_error(tab);
-		FL(Stack)[FL(SP)-n-1] = vector_elt(tab, uintval(f));
+		FL(stack)[FL(sp)-n-1] = vector_elt(tab, uintval(f));
 		v = apply_cl(n);
 	}else{
 		type_error("function", f);
 	}
-	FL(SP) = saveSP;
+	FL(sp) = saveSP;
 	return v;
 }
 
@@ -566,16 +566,16 @@
 fl_apply(value_t f, value_t l)
 {
 	value_t v = l;
-	uint32_t n = FL(SP);
+	uint32_t n = FL(sp);
 
 	PUSH(f);
 	while(iscons(v)){
-		if(FL(SP) >= FL(N_STACK))
+		if(FL(sp) >= FL(nstack))
 			grow_stack();
 		PUSH(car_(v));
 		v = cdr_(v);
 	}
-	n = FL(SP) - n - 1;
+	n = FL(sp) - n - 1;
 	v = _applyn(n);
 	POPN(n+1);
 	return v;
@@ -589,7 +589,7 @@
 	size_t i;
 
 	PUSH(f);
-	while(FL(SP)+n >= FL(N_STACK))
+	while(FL(sp)+n >= FL(nstack))
 		grow_stack();
 	for(i = 0; i < n; i++){
 		value_t a = va_arg(ap, value_t);
@@ -606,10 +606,10 @@
 {
 	va_list ap;
 	va_start(ap, n);
-	uint32_t si = FL(SP);
+	uint32_t si = FL(sp);
 	size_t i;
 
-	while(FL(SP)+n >= FL(N_STACK))
+	while(FL(sp)+n >= FL(nstack))
 		grow_stack();
 	for(i = 0; i < n; i++){
 		value_t a = va_arg(ap, value_t);
@@ -618,7 +618,7 @@
 	cons_t *c = alloc_words(n*2);
 	cons_t *l = c;
 	for(i = 0; i < n; i++){
-		c->car = FL(Stack)[si++];
+		c->car = FL(stack)[si++];
 		c->cdr = tagptr(c+1, TAG_CONS);
 		c++;
 	}
@@ -700,8 +700,8 @@
 		return FL(Nil);
 	PUSH(FL(Nil));
 	PUSH(L);
-	value_t *plcons = &FL(Stack)[FL(SP)-2];
-	value_t *pL = &FL(Stack)[FL(SP)-1];
+	value_t *plcons = &FL(stack)[FL(sp)-2];
+	value_t *pL = &FL(stack)[FL(sp)-1];
 	value_t c;
 	c = mk_cons(); PUSH(c);  // save first cons
 	car_(c) = car_(*pL);
@@ -724,22 +724,22 @@
 static value_t
 do_trycatch(void)
 {
-	uint32_t saveSP = FL(SP);
+	uint32_t saveSP = FL(sp);
 	value_t v = FL(Nil);
-	value_t thunk = FL(Stack)[FL(SP)-2];
-	FL(Stack)[FL(SP)-2] = FL(Stack)[FL(SP)-1];
-	FL(Stack)[FL(SP)-1] = thunk;
+	value_t thunk = FL(stack)[FL(sp)-2];
+	FL(stack)[FL(sp)-2] = FL(stack)[FL(sp)-1];
+	FL(stack)[FL(sp)-1] = thunk;
 
 	FL_TRY{
 		v = apply_cl(0);
 	}
 	FL_CATCH{
-		v = FL(Stack)[saveSP-2];
+		v = FL(stack)[saveSP-2];
 		PUSH(v);
 		PUSH(FL(lasterror));
 		v = apply_cl(1);
 	}
-	FL(SP) = saveSP;
+	FL(sp) = saveSP;
 	return v;
 }
 
@@ -754,10 +754,10 @@
 	uint32_t ntot = nreq+extr;
 	value_t args[64], v = FL(Nil);
 	uint32_t i, a = 0, nrestargs;
-	value_t s1 = FL(Stack)[FL(SP)-1];
-	value_t s2 = FL(Stack)[FL(SP)-2];
-	value_t s4 = FL(Stack)[FL(SP)-4];
-	value_t s5 = FL(Stack)[FL(SP)-5];
+	value_t s1 = FL(stack)[FL(sp)-1];
+	value_t s2 = FL(stack)[FL(sp)-2];
+	value_t s4 = FL(stack)[FL(sp)-4];
+	value_t s5 = FL(stack)[FL(sp)-5];
 	if(__unlikely(nargs < nreq))
 		lerrorf(FL(ArgError), "too few arguments");
 	if(__unlikely(extr > nelem(args)))
@@ -765,7 +765,7 @@
 	for(i = 0; i < extr; i++)
 		args[i] = UNBOUND;
 	for(i = nreq; i < nargs; i++){
-		v = FL(Stack)[bp+i];
+		v = FL(stack)[bp+i];
 		if(issymbol(v) && iskeyword((symbol_t*)ptr(v)))
 			break;
 		if(a >= nopt)
@@ -789,7 +789,7 @@
 			idx += nopt;
 			if(args[idx] == UNBOUND){
 				// if duplicate key, keep first value
-				args[idx] = FL(Stack)[bp+i];
+				args[idx] = FL(stack)[bp+i];
 			}
 		}else{
 			lerrorf(FL(ArgError), "unsupported keyword %s", symbol_name(v));
@@ -797,7 +797,7 @@
 		i++;
 		if(i >= nargs)
 			break;
-		v = FL(Stack)[bp+i];
+		v = FL(stack)[bp+i];
 	}while(issymbol(v) && iskeyword((symbol_t*)ptr(v)));
 no_kw:
 	nrestargs = nargs - i;
@@ -805,16 +805,16 @@
 		lerrorf(FL(ArgError), "too many arguments");
 	nargs = ntot + nrestargs;
 	if(nrestargs)
-		memmove(&FL(Stack)[bp+ntot], &FL(Stack)[bp+i], nrestargs*sizeof(value_t));
-	memmove(&FL(Stack)[bp+nreq], args, extr*sizeof(value_t));
-	FL(SP) = bp + nargs;
-	assert(FL(SP) < FL(N_STACK)-5);
+		memmove(&FL(stack)[bp+ntot], &FL(stack)[bp+i], nrestargs*sizeof(value_t));
+	memmove(&FL(stack)[bp+nreq], args, extr*sizeof(value_t));
+	FL(sp) = bp + nargs;
+	assert(FL(sp) < FL(nstack)-5);
 	PUSH(s5);
 	PUSH(s4);
 	PUSH(nargs);
 	PUSH(s2);
 	PUSH(s1);
-	FL(curr_frame) = FL(SP);
+	FL(curr_frame) = FL(sp);
 	return nargs;
 }
 
@@ -876,36 +876,36 @@
 	USED(v);
 apply_cl_top:
 	captured = 0;
-	func = FL(Stack)[FL(SP)-nargs-1];
+	func = FL(stack)[FL(sp)-nargs-1];
 	ip = cv_data((cvalue_t*)ptr(fn_bcode(func)));
 	assert(!ismanaged((uintptr_t)ip));
-	i = FL(SP)+GET_INT32(ip);
-	while(i >= FL(N_STACK))
+	i = FL(sp)+GET_INT32(ip);
+	while(i >= FL(nstack))
 		grow_stack();
 	ip += 4;
 
-	bp = FL(SP)-nargs;
+	bp = FL(sp)-nargs;
 	PUSH(fn_env(func));
 	PUSH(FL(curr_frame));
 	PUSH(nargs);
-	ipd = FL(SP);
-	FL(SP)++; // ip
+	ipd = FL(sp);
+	FL(sp)++; // ip
 	PUSH(0); // captured?
-	FL(curr_frame) = FL(SP);
+	FL(curr_frame) = FL(sp);
 
 	op = *ip++;
 	while(1){
 		switch(op){
 		OP(OP_LOADA0)
-			PUSH(captured ? vector_elt(FL(Stack)[bp], 0) : FL(Stack)[bp]);
+			PUSH(captured ? vector_elt(FL(stack)[bp], 0) : FL(stack)[bp]);
 			NEXT_OP;
 
 		OP(OP_LOADA1)
-			PUSH(captured ? vector_elt(FL(Stack)[bp], 1) : FL(Stack)[bp+1]);
+			PUSH(captured ? vector_elt(FL(stack)[bp], 1) : FL(stack)[bp+1]);
 			NEXT_OP;
 
 		OP(OP_LOADV)
-			v = fn_vals(FL(Stack)[bp-1]);
+			v = fn_vals(FL(stack)[bp-1]);
 			assert(*ip < vector_size(v));
 			PUSH(vector_elt(v, *ip++));
 			NEXT_OP;
@@ -936,15 +936,15 @@
 				n = *ip++;  // nargs
 			}
 		do_call:
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			func = FL(Stack)[FL(SP)-n-1];
+			FL(stack)[ipd] = (uintptr_t)ip;
+			func = FL(stack)[FL(sp)-n-1];
 			if(tag(func) == TAG_FUNCTION){
 				if(func > (N_BUILTINS<<3)){
 					if(tail){
-						FL(curr_frame) = FL(Stack)[FL(curr_frame)-4];
+						FL(curr_frame) = FL(stack)[FL(curr_frame)-4];
 						for(s = -1; s < (fixnum_t)n; s++)
-							FL(Stack)[bp+s] = FL(Stack)[FL(SP)-n+s];
-						FL(SP) = bp+n;
+							FL(stack)[bp+s] = FL(stack)[FL(sp)-n+s];
+						FL(sp) = bp+n;
 					}
 					nargs = n;
 					goto apply_cl_top;
@@ -957,9 +957,9 @@
 						else if(s != ANYARGS && (signed)n < -s)
 							argcount(n, -s);
 						// remove function arg
-						for(s = FL(SP)-n-1; s < (int)FL(SP)-1; s++)
-							FL(Stack)[s] = FL(Stack)[s+1];
-						FL(SP)--;
+						for(s = FL(sp)-n-1; s < (int)FL(sp)-1; s++)
+							FL(stack)[s] = FL(stack)[s+1];
+						FL(sp)--;
 						switch(i){
 						case OP_LIST:   goto apply_list;
 						case OP_VECTOR: goto apply_vector;
@@ -975,21 +975,21 @@
 					}
 				}
 			}else if(__likely(iscbuiltin(func))){
-				s = FL(SP);
-				v = (((builtin_t*)ptr(func))[3])(&FL(Stack)[FL(SP)-n], n);
-				FL(SP) = s-n;
-				FL(Stack)[FL(SP)-1] = v;
+				s = FL(sp);
+				v = (((builtin_t*)ptr(func))[3])(&FL(stack)[FL(sp)-n], n);
+				FL(sp) = s-n;
+				FL(stack)[FL(sp)-1] = v;
 				NEXT_OP;
 			}
 			type_error("function", func);
 
 		OP(OP_LOADGL)
-			v = fn_vals(FL(Stack)[bp-1]);
+			v = fn_vals(FL(stack)[bp-1]);
 			v = vector_elt(v, GET_INT32(ip));
 			ip += 4;
 			if(0){
 		OP(OP_LOADG)
-				v = fn_vals(FL(Stack)[bp-1]);
+				v = fn_vals(FL(stack)[bp-1]);
 				assert(*ip < vector_size(v));
 				v = vector_elt(v, *ip);
 				ip++;
@@ -997,7 +997,7 @@
 			assert(issymbol(v));
 			sym = (symbol_t*)ptr(v);
 			if(__unlikely(sym->binding == UNBOUND)){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				unbound_error(v);
 			}
 			PUSH(sym->binding);
@@ -1007,12 +1007,12 @@
 			assert(nargs > 0);
 			i = *ip++;
 			if(captured){
-				e = FL(Stack)[bp];
+				e = FL(stack)[bp];
 				assert(isvector(e));
 				assert(i < vector_size(e));
 				v = vector_elt(e, i);
 			}else{
-				v = FL(Stack)[bp+i];
+				v = FL(stack)[bp+i];
 			}
 			PUSH(v);
 			NEXT_OP;
@@ -1020,7 +1020,7 @@
 		OP(OP_LOADC)
 			s = *ip++;
 			i = *ip++;
-			v = FL(Stack)[bp+nargs];
+			v = FL(stack)[bp+nargs];
 			while(s--)
 				v = vector_elt(v, vector_size(v)-1);
 			assert(isvector(v));
@@ -1030,40 +1030,40 @@
 
 		OP(OP_RET)
 			v = POP();
-			FL(SP) = FL(curr_frame);
-			FL(curr_frame) = FL(Stack)[FL(SP)-4];
+			FL(sp) = FL(curr_frame);
+			FL(curr_frame) = FL(stack)[FL(sp)-4];
 			if(FL(curr_frame) == top_frame)
 				return v;
-			FL(SP) -= 5+nargs;
-			captured = FL(Stack)[FL(curr_frame)-1];
+			FL(sp) -= 5+nargs;
+			captured = FL(stack)[FL(curr_frame)-1];
 			ipd = FL(curr_frame)-2;
-			ip = (uint8_t*)FL(Stack)[ipd];
-			nargs = FL(Stack)[FL(curr_frame)-3];
+			ip = (uint8_t*)FL(stack)[ipd];
+			nargs = FL(stack)[FL(curr_frame)-3];
 			bp = FL(curr_frame) - 5 - nargs;
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_DUP)
-			FL(SP)++;
-			FL(Stack)[FL(SP)-1] = FL(Stack)[FL(SP)-2];
+			FL(sp)++;
+			FL(stack)[FL(sp)-1] = FL(stack)[FL(sp)-2];
 			NEXT_OP;
 
 		OP(OP_CAR)
-			v = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-1];
 			if(__unlikely(!iscons(v))){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				type_error("cons", v);
 			}
-			FL(Stack)[FL(SP)-1] = car_(v);
+			FL(stack)[FL(sp)-1] = car_(v);
 			NEXT_OP;
 
 		OP(OP_CDR)
-			v = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-1];
 			if(__unlikely(!iscons(v))){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				type_error("cons", v);
 			}
-			FL(Stack)[FL(SP)-1] = cdr_(v);
+			FL(stack)[FL(sp)-1] = cdr_(v);
 			NEXT_OP;
 
 		OP(OP_CLOSURE)
@@ -1076,41 +1076,41 @@
 				pv[0] = fixnum(n+1);
 				pv++;
 				do{
-					pv[n] = FL(Stack)[bp+n];
+					pv[n] = FL(stack)[bp+n];
 				}while(n--);
 				// environment representation changed; install
 				// the new representation so everybody can see it
 				captured = 1;
-				FL(Stack)[FL(curr_frame)-1] = 1;
-				FL(Stack)[bp] = FL(Stack)[FL(SP)-1];
+				FL(stack)[FL(curr_frame)-1] = 1;
+				FL(stack)[bp] = FL(stack)[FL(sp)-1];
 			}else{
-				PUSH(FL(Stack)[bp]); // env has already been captured; share
+				PUSH(FL(stack)[bp]); // env has already been captured; share
 			}
 			if(FL(curheap) > FL(lim)-2)
 				gc(0);
 			pv = (value_t*)FL(curheap);
 			FL(curheap) += 4*sizeof(value_t);
-			e = FL(Stack)[FL(SP)-2];  // closure to copy
+			e = FL(stack)[FL(sp)-2];  // closure to copy
 			assert(isfunction(e));
 			pv[0] = ((value_t*)ptr(e))[0];
 			pv[1] = ((value_t*)ptr(e))[1];
-			pv[2] = FL(Stack)[FL(SP)-1];  // env
+			pv[2] = FL(stack)[FL(sp)-1];  // env
 			pv[3] = ((value_t*)ptr(e))[3];
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = tagptr(pv, TAG_FUNCTION);
+			FL(stack)[FL(sp)-1] = tagptr(pv, TAG_FUNCTION);
 			NEXT_OP;
 
 		OP(OP_SETA)
 			assert(nargs > 0);
-			v = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-1];
 			i = *ip++;
 			if(captured){
-				e = FL(Stack)[bp];
+				e = FL(stack)[bp];
 				assert(isvector(e));
 				assert(i < vector_size(e));
 				vector_elt(e, i) = v;
 			}else{
-				FL(Stack)[bp+i] = v;
+				FL(stack)[bp+i] = v;
 			}
 			NEXT_OP;
 
@@ -1119,15 +1119,15 @@
 			NEXT_OP;
 
 		OP(OP_LOADC00)
-			PUSH(vector_elt(FL(Stack)[bp+nargs], 0));
+			PUSH(vector_elt(FL(stack)[bp+nargs], 0));
 			NEXT_OP;
 
 		OP(OP_PAIRP)
-			FL(Stack)[FL(SP)-1] = iscons(FL(Stack)[FL(SP)-1]) ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = iscons(FL(stack)[FL(sp)-1]) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_BRNE)
-			ip += FL(Stack)[FL(SP)-2] != FL(Stack)[FL(SP)-1] ? GET_INT16(ip) : 2;
+			ip += FL(stack)[FL(sp)-2] != FL(stack)[FL(sp)-1] ? GET_INT16(ip) : 2;
 			POPN(2);
 			NEXT_OP;
 
@@ -1140,29 +1140,29 @@
 			NEXT_OP;
 
 		OP(OP_LOADC01)
-			PUSH(vector_elt(FL(Stack)[bp+nargs], 1));
+			PUSH(vector_elt(FL(stack)[bp+nargs], 1));
 			NEXT_OP;
 
 		OP(OP_AREF)
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			v = FL(Stack)[FL(SP)-2];
+			FL(stack)[ipd] = (uintptr_t)ip;
+			v = FL(stack)[FL(sp)-2];
 			if(isvector(v)){
-				e = FL(Stack)[FL(SP)-1];
+				e = FL(stack)[FL(sp)-1];
 				i = isfixnum(e) ? numval(e) : (uint32_t)toulong(e);
 				if(__unlikely(i >= vector_size(v)))
 					bounds_error(v, e);
 				v = vector_elt(v, i);
 			}else if(__likely(isarray(v))){
-				v = cvalue_array_aref(&FL(Stack)[FL(SP)-2]);
+				v = cvalue_array_aref(&FL(stack)[FL(sp)-2]);
 			}else{
 				type_error("sequence", v);
 			}
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_ATOMP)
-			FL(Stack)[FL(SP)-1] = iscons(FL(Stack)[FL(SP)-1]) ? FL(f) : FL(t);
+			FL(stack)[FL(sp)-1] = iscons(FL(stack)[FL(sp)-1]) ? FL(f) : FL(t);
 			NEXT_OP;
 
 		OP(OP_BRT)
@@ -1178,32 +1178,32 @@
 			NEXT_OP;
 
 		OP(OP_LT)
-			x = numeric_compare(FL(Stack)[FL(SP)-2], FL(Stack)[FL(SP)-1], 0, 0, 0);
+			x = numeric_compare(FL(stack)[FL(sp)-2], FL(stack)[FL(sp)-1], 0, 0, 0);
 			if(x > 1)
-				x = numval(fl_compare(FL(Stack)[FL(SP)-2], FL(Stack)[FL(SP)-1]));
+				x = numval(fl_compare(FL(stack)[FL(sp)-2], FL(stack)[FL(sp)-1]));
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = x < 0 ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = x < 0 ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_ADD2)
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			if(bothfixnums(FL(Stack)[FL(SP)-1], FL(Stack)[FL(SP)-2])){
-				s = numval(FL(Stack)[FL(SP)-1]) + numval(FL(Stack)[FL(SP)-2]);
+			FL(stack)[ipd] = (uintptr_t)ip;
+			if(bothfixnums(FL(stack)[FL(sp)-1], FL(stack)[FL(sp)-2])){
+				s = numval(FL(stack)[FL(sp)-1]) + numval(FL(stack)[FL(sp)-2]);
 				v = fits_fixnum(s) ? fixnum(s) : mk_xlong(s);
 			}else{
-				v = fl_add_any(&FL(Stack)[FL(SP)-2], 2, 0);
+				v = fl_add_any(&FL(stack)[FL(sp)-2], 2, 0);
 			}
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_SETCDR)
-			v = FL(Stack)[FL(SP)-2];
+			v = FL(stack)[FL(sp)-2];
 			if(__unlikely(!iscons(v))){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				type_error("cons", v);
 			}
-			cdr_(v) = FL(Stack)[FL(SP)-1];
+			cdr_(v) = FL(stack)[FL(sp)-1];
 			POPN(1);
 			NEXT_OP;
 
@@ -1216,77 +1216,77 @@
 				gc(0);
 			c = (cons_t*)FL(curheap);
 			FL(curheap) += sizeof(cons_t);
-			c->car = FL(Stack)[FL(SP)-2];
-			c->cdr = FL(Stack)[FL(SP)-1];
-			FL(Stack)[FL(SP)-2] = tagptr(c, TAG_CONS);
+			c->car = FL(stack)[FL(sp)-2];
+			c->cdr = FL(stack)[FL(sp)-1];
+			FL(stack)[FL(sp)-2] = tagptr(c, TAG_CONS);
 			POPN(1);
 			NEXT_OP;
 
 		OP(OP_EQ)
-			FL(Stack)[FL(SP)-2] = FL(Stack)[FL(SP)-2] == FL(Stack)[FL(SP)-1] ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-2] = FL(stack)[FL(sp)-2] == FL(stack)[FL(sp)-1] ? FL(t) : FL(f);
 			POPN(1);
 			NEXT_OP;
 
 		OP(OP_SYMBOLP)
-			FL(Stack)[FL(SP)-1] = issymbol(FL(Stack)[FL(SP)-1]) ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = issymbol(FL(stack)[FL(sp)-1]) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_NOT)
-			FL(Stack)[FL(SP)-1] = FL(Stack)[FL(SP)-1] == FL(f) ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = FL(stack)[FL(sp)-1] == FL(f) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_CADR)
-			v = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-1];
 			if(__unlikely(!iscons(v))){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				type_error("cons", v);
 			}
 			v = cdr_(v);
 			if(__unlikely(!iscons(v))){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				type_error("cons", v);
 			}
-			FL(Stack)[FL(SP)-1] = car_(v);
+			FL(stack)[FL(sp)-1] = car_(v);
 			NEXT_OP;
 
 		OP(OP_NEG)
 		do_neg:
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			FL(Stack)[FL(SP)-1] = fl_neg(FL(Stack)[FL(SP)-1]);
+			FL(stack)[ipd] = (uintptr_t)ip;
+			FL(stack)[FL(sp)-1] = fl_neg(FL(stack)[FL(sp)-1]);
 			NEXT_OP;
 
 		OP(OP_NULLP)
-			FL(Stack)[FL(SP)-1] = FL(Stack)[FL(SP)-1] == FL(Nil) ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = FL(stack)[FL(sp)-1] == FL(Nil) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_BOOLEANP)
-			v = FL(Stack)[FL(SP)-1];
-			FL(Stack)[FL(SP)-1] = (v == FL(t) || v == FL(f)) ? FL(t) : FL(f);
+			v = FL(stack)[FL(sp)-1];
+			FL(stack)[FL(sp)-1] = (v == FL(t) || v == FL(f)) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_NUMBERP)
-			v = FL(Stack)[FL(SP)-1];
-			FL(Stack)[FL(SP)-1] = fl_isnumber(v) ? FL(t) : FL(f);
+			v = FL(stack)[FL(sp)-1];
+			FL(stack)[FL(sp)-1] = fl_isnumber(v) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_FIXNUMP)
-			FL(Stack)[FL(SP)-1] = isfixnum(FL(Stack)[FL(SP)-1]) ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = isfixnum(FL(stack)[FL(sp)-1]) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_BOUNDP)
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			sym = tosymbol(FL(Stack)[FL(SP)-1]);
-			FL(Stack)[FL(SP)-1] = sym->binding == UNBOUND ? FL(f) : FL(t);
+			FL(stack)[ipd] = (uintptr_t)ip;
+			sym = tosymbol(FL(stack)[FL(sp)-1]);
+			FL(stack)[FL(sp)-1] = sym->binding == UNBOUND ? FL(f) : FL(t);
 			NEXT_OP;
 
 		OP(OP_BUILTINP)
-			v = FL(Stack)[FL(SP)-1];
-			FL(Stack)[FL(SP)-1] = (isbuiltin(v) || iscbuiltin(v)) ? FL(t) : FL(f);
+			v = FL(stack)[FL(sp)-1];
+			FL(stack)[FL(sp)-1] = (isbuiltin(v) || iscbuiltin(v)) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_FUNCTIONP)
-			v = FL(Stack)[FL(SP)-1];
-			FL(Stack)[FL(SP)-1] =
+			v = FL(stack)[FL(sp)-1];
+			FL(stack)[FL(sp)-1] =
 				((tag(v) == TAG_FUNCTION &&
 				  (isbuiltin(v) || v>(N_BUILTINS<<3))) ||
 				 iscbuiltin(v)) ? FL(t) : FL(f);
@@ -1293,7 +1293,7 @@
 			NEXT_OP;
 
 		OP(OP_VECTORP)
-			FL(Stack)[FL(SP)-1] = isvector(FL(Stack)[FL(SP)-1]) ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-1] = isvector(FL(stack)[FL(sp)-1]) ? FL(t) : FL(f);
 			NEXT_OP;
 
 		OP(OP_JMPL)
@@ -1309,7 +1309,7 @@
 			NEXT_OP;
 
 		OP(OP_BRNEL)
-			ip += FL(Stack)[FL(SP)-2] != FL(Stack)[FL(SP)-1] ? GET_INT32(ip) : 4;
+			ip += FL(stack)[FL(sp)-2] != FL(stack)[FL(sp)-1] ? GET_INT32(ip) : 4;
 			POPN(2);
 			NEXT_OP;
 
@@ -1326,32 +1326,32 @@
 			NEXT_OP;
 
 		OP(OP_EQV)
-			if(FL(Stack)[FL(SP)-2] == FL(Stack)[FL(SP)-1])
+			if(FL(stack)[FL(sp)-2] == FL(stack)[FL(sp)-1])
 				v = FL(t);
-			else if(!leafp(FL(Stack)[FL(SP)-2]) || !leafp(FL(Stack)[FL(SP)-1]))
+			else if(!leafp(FL(stack)[FL(sp)-2]) || !leafp(FL(stack)[FL(sp)-1]))
 				v = FL(f);
 			else
-				v = compare_(FL(Stack)[FL(SP)-2], FL(Stack)[FL(SP)-1], 1) == 0 ? FL(t) : FL(f);
-			FL(Stack)[FL(SP)-2] = v;
+				v = compare_(FL(stack)[FL(sp)-2], FL(stack)[FL(sp)-1], 1) == 0 ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-2] = v;
 			POPN(1);
 			NEXT_OP;
 
 		OP(OP_EQUAL)
-			if(FL(Stack)[FL(SP)-2] == FL(Stack)[FL(SP)-1])
+			if(FL(stack)[FL(sp)-2] == FL(stack)[FL(sp)-1])
 				v = FL(t);
 			else
-				v = compare_(FL(Stack)[FL(SP)-2], FL(Stack)[FL(SP)-1], 1) == 0 ? FL(t) : FL(f);
-			FL(Stack)[FL(SP)-2] = v;
+				v = compare_(FL(stack)[FL(sp)-2], FL(stack)[FL(sp)-1], 1) == 0 ? FL(t) : FL(f);
+			FL(stack)[FL(sp)-2] = v;
 			POPN(1);
 			NEXT_OP;
 
 		OP(OP_SETCAR)
-			v = FL(Stack)[FL(SP)-2];
+			v = FL(stack)[FL(sp)-2];
 			if(__unlikely(!iscons(v))){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				type_error("cons", v);
 			}
-			car_(v) = FL(Stack)[FL(SP)-1];
+			car_(v) = FL(stack)[FL(sp)-1];
 			POPN(1);
 			NEXT_OP;
 
@@ -1359,7 +1359,7 @@
 			n = *ip++;
 		apply_list:
 			if(n > 0){
-				v = list(&FL(Stack)[FL(SP)-n], n, 0);
+				v = list(&FL(stack)[FL(sp)-n], n, 0);
 				POPN(n);
 				PUSH(v);
 			}else{
@@ -1376,14 +1376,14 @@
 			n = *ip++;
 		apply_apply:
 			v = POP();	 // arglist
-			n = FL(SP)-(n-2);  // n-2 == # leading arguments not in the list
+			n = FL(sp)-(n-2);  // n-2 == # leading arguments not in the list
 			while(iscons(v)){
-				if(FL(SP) >= FL(N_STACK))
+				if(FL(sp) >= FL(nstack))
 					grow_stack();
 				PUSH(car_(v));
 				v = cdr_(v);
 			}
-			n = FL(SP)-n;
+			n = FL(sp)-n;
 			goto do_call;
 
 		OP(OP_ADD)
@@ -1390,10 +1390,10 @@
 			n = *ip++;
 		apply_add:
 			s = 0;
-			i = FL(SP)-n;
-			for(; i < FL(SP); i++){
-				if(isfixnum(FL(Stack)[i])){
-					s += numval(FL(Stack)[i]);
+			i = FL(sp)-n;
+			for(; i < FL(sp); i++){
+				if(isfixnum(FL(stack)[i])){
+					s += numval(FL(stack)[i]);
 					if(__unlikely(!fits_fixnum(s))){
 						i++;
 						goto add_ovf;
@@ -1400,12 +1400,12 @@
 					}
 				}else{
 				add_ovf:
-					FL(Stack)[ipd] = (uintptr_t)ip;
-					v = fl_add_any(&FL(Stack)[i], FL(SP)-i, s);
+					FL(stack)[ipd] = (uintptr_t)ip;
+					v = fl_add_any(&FL(stack)[i], FL(sp)-i, s);
 					break;
 				}
 			}
-			if(i == FL(SP))
+			if(i == FL(sp))
 				v = fixnum(s);
 			POPN(n);
 			PUSH(v);
@@ -1418,15 +1418,15 @@
 				goto do_sub2;
 			if(n == 1)
 				goto do_neg;
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			i = FL(SP)-n;
+			FL(stack)[ipd] = (uintptr_t)ip;
+			i = FL(sp)-n;
 			// we need to pass the full arglist on to fl_add_any
 			// so it can handle rest args properly
-			PUSH(FL(Stack)[i]);
-			FL(Stack)[i] = fixnum(0);
-			FL(Stack)[i+1] = fl_neg(fl_add_any(&FL(Stack)[i], n, 0));
-			FL(Stack)[i] = POP();
-			v = fl_add_any(&FL(Stack)[i], 2, 0);
+			PUSH(FL(stack)[i]);
+			FL(stack)[i] = fixnum(0);
+			FL(stack)[i+1] = fl_neg(fl_add_any(&FL(stack)[i], n, 0));
+			FL(stack)[i] = POP();
+			v = fl_add_any(&FL(stack)[i], 2, 0);
 			POPN(n);
 			PUSH(v);
 			NEXT_OP;
@@ -1433,23 +1433,23 @@
 
 		OP(OP_SUB2)
 		do_sub2:
-			if(bothfixnums(FL(Stack)[FL(SP)-2], FL(Stack)[FL(SP)-1])){
-				s = numval(FL(Stack)[FL(SP)-2]) - numval(FL(Stack)[FL(SP)-1]);
+			if(bothfixnums(FL(stack)[FL(sp)-2], FL(stack)[FL(sp)-1])){
+				s = numval(FL(stack)[FL(sp)-2]) - numval(FL(stack)[FL(sp)-1]);
 				v = fits_fixnum(s) ? fixnum(s) : mk_xlong(s);
 			}else{
-				FL(Stack)[ipd] = (uintptr_t)ip;
-				FL(Stack)[FL(SP)-1] = fl_neg(FL(Stack)[FL(SP)-1]);
-				v = fl_add_any(&FL(Stack)[FL(SP)-2], 2, 0);
+				FL(stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[FL(sp)-1] = fl_neg(FL(stack)[FL(sp)-1]);
+				v = fl_add_any(&FL(stack)[FL(sp)-2], 2, 0);
 			}
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_MUL)
 			n = *ip++;
 		apply_mul:
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			v = fl_mul_any(&FL(Stack)[FL(SP)-n], n);
+			FL(stack)[ipd] = (uintptr_t)ip;
+			v = fl_mul_any(&FL(stack)[FL(sp)-n], n);
 			POPN(n);
 			PUSH(v);
 			NEXT_OP;
@@ -1457,18 +1457,18 @@
 		OP(OP_DIV)
 			n = *ip++;
 		apply_div:
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			i = FL(SP)-n;
+			FL(stack)[ipd] = (uintptr_t)ip;
+			i = FL(sp)-n;
 			if(n == 1){
-				FL(Stack)[FL(SP)-1] = fl_div2(fixnum(1), FL(Stack)[i]);
+				FL(stack)[FL(sp)-1] = fl_div2(fixnum(1), FL(stack)[i]);
 			}else{
 				if(n > 2){
-					PUSH(FL(Stack)[i]);
-					FL(Stack)[i] = fixnum(1);
-					FL(Stack)[i+1] = fl_mul_any(&FL(Stack)[i], n);
-					FL(Stack)[i] = POP();
+					PUSH(FL(stack)[i]);
+					FL(stack)[i] = fixnum(1);
+					FL(stack)[i+1] = fl_mul_any(&FL(stack)[i], n);
+					FL(stack)[i] = POP();
 				}
-				v = fl_div2(FL(Stack)[i], FL(Stack)[i+1]);
+				v = fl_div2(FL(stack)[i], FL(stack)[i+1]);
 				POPN(n);
 				PUSH(v);
 			}
@@ -1475,9 +1475,9 @@
 			NEXT_OP;
 
 		OP(OP_IDIV)
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			v = FL(Stack)[FL(SP)-2];
-			e = FL(Stack)[FL(SP)-1];
+			FL(stack)[ipd] = (uintptr_t)ip;
+			v = FL(stack)[FL(sp)-2];
+			e = FL(stack)[FL(sp)-1];
 			if(bothfixnums(v, e)){
 				if(e == 0)
 					DivideByZeroError();
@@ -1486,23 +1486,23 @@
 				v = fl_idiv2(v, e);
 			}
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_NUMEQ)
-			v = FL(Stack)[FL(SP)-2]; e = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-2]; e = FL(stack)[FL(sp)-1];
 			if(bothfixnums(v, e))
 				v = v == e ? FL(t) : FL(f);
 			else{
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				v = numeric_compare(v, e, 1, 0, 1) == 0 ? FL(t) : FL(f);
 			}
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_COMPARE)
-			FL(Stack)[FL(SP)-2] = compare_(FL(Stack)[FL(SP)-2], FL(Stack)[FL(SP)-1], 0);
+			FL(stack)[FL(sp)-2] = compare_(FL(stack)[FL(sp)-2], FL(stack)[FL(sp)-1], 0);
 			POPN(1);
 			NEXT_OP;
 
@@ -1513,7 +1513,7 @@
 				n = GET_INT32(ip);
 				ip += 4;
 			}
-			FL(Stack)[ipd] = (uintptr_t)ip;
+			FL(stack)[ipd] = (uintptr_t)ip;
 			argcount(nargs, n);
 			NEXT_OP;
 
@@ -1522,7 +1522,7 @@
 		apply_vector:
 			v = alloc_vector(n, 0);
 			if(n){
-				memmove(&vector_elt(v, 0), &FL(Stack)[FL(SP)-n], n*sizeof(value_t));
+				memmove(&vector_elt(v, 0), &FL(stack)[FL(sp)-n], n*sizeof(value_t));
 				POPN(n);
 			}
 			PUSH(v);
@@ -1529,37 +1529,37 @@
 			NEXT_OP;
 
 		OP(OP_ASET)
-			e = FL(Stack)[FL(SP)-3];
-			FL(Stack)[ipd] = (uintptr_t)ip;
+			e = FL(stack)[FL(sp)-3];
+			FL(stack)[ipd] = (uintptr_t)ip;
 			if(isvector(e)){
-				i = tofixnum(FL(Stack)[FL(SP)-2]);
+				i = tofixnum(FL(stack)[FL(sp)-2]);
 				if(__unlikely(i >= vector_size(e)))
-					bounds_error(v, FL(Stack)[FL(SP)-1]);
-				vector_elt(e, i) = (v = FL(Stack)[FL(SP)-1]);
+					bounds_error(v, FL(stack)[FL(sp)-1]);
+				vector_elt(e, i) = (v = FL(stack)[FL(sp)-1]);
 			}else if(__likely(isarray(e))){
-				v = cvalue_array_aset(&FL(Stack)[FL(SP)-3]);
+				v = cvalue_array_aset(&FL(stack)[FL(sp)-3]);
 			}else{
 				type_error("sequence", e);
 			}
 			POPN(2);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_FOR)
-			FL(Stack)[ipd] = (uintptr_t)ip;
-			s  = tofixnum(FL(Stack)[FL(SP)-3]);
-			hi = tofixnum(FL(Stack)[FL(SP)-2]);
+			FL(stack)[ipd] = (uintptr_t)ip;
+			s  = tofixnum(FL(stack)[FL(sp)-3]);
+			hi = tofixnum(FL(stack)[FL(sp)-2]);
 			v = FL(unspecified);
-			FL(SP) += 2;
-			n = FL(SP);
+			FL(sp) += 2;
+			n = FL(sp);
 			for(; s <= hi; s++){
-				FL(Stack)[FL(SP)-2] = FL(Stack)[FL(SP)-3];
-				FL(Stack)[FL(SP)-1] = fixnum(s);
+				FL(stack)[FL(sp)-2] = FL(stack)[FL(sp)-3];
+				FL(stack)[FL(sp)-1] = fixnum(s);
 				v = apply_cl(1);
-				FL(SP) = n;
+				FL(sp) = n;
 			}
 			POPN(4);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_LOADNIL)
@@ -1572,7 +1572,7 @@
 			NEXT_OP;
 
 		OP(OP_LOADVL)
-			v = fn_vals(FL(Stack)[bp-1]);
+			v = fn_vals(FL(stack)[bp-1]);
 			v = vector_elt(v, GET_INT32(ip));
 			ip += 4;
 			PUSH(v);
@@ -1579,12 +1579,12 @@
 			NEXT_OP;
 
 		OP(OP_SETGL)
-			v = fn_vals(FL(Stack)[bp-1]);
+			v = fn_vals(FL(stack)[bp-1]);
 			v = vector_elt(v, GET_INT32(ip));
 			ip += 4;
 			if(0){
 		OP(OP_SETG)
-				v = fn_vals(FL(Stack)[bp-1]);
+				v = fn_vals(FL(stack)[bp-1]);
 				assert(*ip < vector_size(v));
 				v = vector_elt(v, *ip);
 				ip++;
@@ -1591,7 +1591,7 @@
 			}
 			assert(issymbol(v));
 			sym = (symbol_t*)ptr(v);
-			v = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-1];
 			if(!isconstant(sym))
 				sym->binding = v;
 			NEXT_OP;
@@ -1600,30 +1600,30 @@
 			assert(nargs > 0);
 			i = GET_INT32(ip);
 			ip += 4;
-			v = captured ? vector_elt(FL(Stack)[bp], i) : FL(Stack)[bp+i];
+			v = captured ? vector_elt(FL(stack)[bp], i) : FL(stack)[bp+i];
 			PUSH(v);
 			NEXT_OP;
 
 		OP(OP_SETAL)
 			assert(nargs > 0);
-			v = FL(Stack)[FL(SP)-1];
+			v = FL(stack)[FL(sp)-1];
 			i = GET_INT32(ip);
 			ip += 4;
 			if(captured)
-				vector_elt(FL(Stack)[bp], i) = v;
+				vector_elt(FL(stack)[bp], i) = v;
 			else
-				FL(Stack)[bp+i] = v;
+				FL(stack)[bp+i] = v;
 			NEXT_OP;
 
 		OP(OP_SETC)
 			s = *ip++;
 			i = *ip++;
-			v = FL(Stack)[bp+nargs];
+			v = FL(stack)[bp+nargs];
 			while(s--)
 				v = vector_elt(v, vector_size(v)-1);
 			assert(isvector(v));
 			assert(i < vector_size(v));
-			vector_elt(v, i) = FL(Stack)[FL(SP)-1];
+			vector_elt(v, i) = FL(stack)[FL(sp)-1];
 			NEXT_OP;
 
 		OP(OP_LOADCL)
@@ -1631,7 +1631,7 @@
 			ip += 4;
 			i = GET_INT32(ip);
 			ip += 4;
-			v = FL(Stack)[bp+nargs];
+			v = FL(stack)[bp+nargs];
 			while(s--)
 				v = vector_elt(v, vector_size(v)-1);
 			PUSH(vector_elt(v, i));
@@ -1642,11 +1642,11 @@
 			ip += 4;
 			i = GET_INT32(ip);
 			ip += 4;
-			v = FL(Stack)[bp+nargs];
+			v = FL(stack)[bp+nargs];
 			while(s--)
 				v = vector_elt(v, vector_size(v)-1);
 			assert(i < vector_size(v));
-			vector_elt(v, i) = FL(Stack)[FL(SP)-1];
+			vector_elt(v, i) = FL(stack)[FL(sp)-1];
 			NEXT_OP;
 
 		OP(OP_VARGC)
@@ -1658,37 +1658,37 @@
 			}
 			s = (fixnum_t)nargs - (fixnum_t)i;
 			if(s > 0){
-				v = list(&FL(Stack)[bp+i], s, 0);
-				FL(Stack)[bp+i] = v;
+				v = list(&FL(stack)[bp+i], s, 0);
+				FL(stack)[bp+i] = v;
 				if(s > 1){
-					FL(Stack)[bp+i+1] = FL(Stack)[bp+nargs+0];
-					FL(Stack)[bp+i+2] = FL(Stack)[bp+nargs+1];
-					FL(Stack)[bp+i+3] = i+1;
-					//FL(Stack)[bp+i+4] = 0;
-					FL(Stack)[bp+i+5] = 0;
-					FL(SP) =  bp+i+6;
-					FL(curr_frame) = FL(SP);
+					FL(stack)[bp+i+1] = FL(stack)[bp+nargs+0];
+					FL(stack)[bp+i+2] = FL(stack)[bp+nargs+1];
+					FL(stack)[bp+i+3] = i+1;
+					//FL(stack)[bp+i+4] = 0;
+					FL(stack)[bp+i+5] = 0;
+					FL(sp) =  bp+i+6;
+					FL(curr_frame) = FL(sp);
 				}
 			}else if(__unlikely(s < 0)){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				lerrorf(FL(ArgError), "too few arguments");
 			}else{
 				PUSH(0);
-				FL(Stack)[FL(SP)-3] = i+1;
-				FL(Stack)[FL(SP)-4] = FL(Stack)[FL(SP)-5];
-				FL(Stack)[FL(SP)-5] = FL(Stack)[FL(SP)-6];
-				FL(Stack)[FL(SP)-6] = FL(Nil);
-				FL(curr_frame) = FL(SP);
+				FL(stack)[FL(sp)-3] = i+1;
+				FL(stack)[FL(sp)-4] = FL(stack)[FL(sp)-5];
+				FL(stack)[FL(sp)-5] = FL(stack)[FL(sp)-6];
+				FL(stack)[FL(sp)-6] = FL(Nil);
+				FL(curr_frame) = FL(sp);
 			}
-			ipd = FL(SP)-2;
+			ipd = FL(sp)-2;
 			nargs = i+1;
 			NEXT_OP;
 
 		OP(OP_TRYCATCH)
-			FL(Stack)[ipd] = (uintptr_t)ip;
+			FL(stack)[ipd] = (uintptr_t)ip;
 			v = do_trycatch();
 			POPN(1);
-			FL(Stack)[FL(SP)-1] = v;
+			FL(stack)[FL(sp)-1] = v;
 			NEXT_OP;
 
 		OP(OP_OPTARGS)
@@ -1697,12 +1697,12 @@
 			n = GET_INT32(ip);
 			ip += 4;
 			if(__unlikely(nargs < i)){
-				FL(Stack)[ipd] = (uintptr_t)ip;
+				FL(stack)[ipd] = (uintptr_t)ip;
 				lerrorf(FL(ArgError), "too few arguments");
 			}
 			if((int32_t)n > 0){
 				if(__unlikely(nargs > n)){
-					FL(Stack)[ipd] = (uintptr_t)ip;
+					FL(stack)[ipd] = (uintptr_t)ip;
 					lerrorf(FL(ArgError), "too many arguments");
 				}
 			}else
@@ -1709,16 +1709,16 @@
 				n = -n;
 			if(__likely(n > nargs)){
 				n -= nargs;
-				FL(SP) += n;
-				FL(Stack)[FL(SP)-1] = FL(Stack)[FL(SP)-n-1];
-				FL(Stack)[FL(SP)-2] = FL(Stack)[FL(SP)-n-2];
-				FL(Stack)[FL(SP)-3] = nargs+n;
-				FL(Stack)[FL(SP)-4] = FL(Stack)[FL(SP)-n-4];
-				FL(Stack)[FL(SP)-5] = FL(Stack)[FL(SP)-n-5];
-				FL(curr_frame) = FL(SP);
-				ipd = FL(SP)-2;
+				FL(sp) += n;
+				FL(stack)[FL(sp)-1] = FL(stack)[FL(sp)-n-1];
+				FL(stack)[FL(sp)-2] = FL(stack)[FL(sp)-n-2];
+				FL(stack)[FL(sp)-3] = nargs+n;
+				FL(stack)[FL(sp)-4] = FL(stack)[FL(sp)-n-4];
+				FL(stack)[FL(sp)-5] = FL(stack)[FL(sp)-n-5];
+				FL(curr_frame) = FL(sp);
+				ipd = FL(sp)-2;
 				for(i = 0; i < n; i++)
-					FL(Stack)[bp+nargs+i] = UNBOUND;
+					FL(stack)[bp+nargs+i] = UNBOUND;
 				nargs += n;
 			}
 			NEXT_OP;
@@ -1726,12 +1726,12 @@
 		OP(OP_BRBOUND)
 			i = GET_INT32(ip);
 			ip += 4;
-			v = captured ? vector_elt(FL(Stack)[bp], i) : FL(Stack)[bp+i];
+			v = captured ? vector_elt(FL(stack)[bp], i) : FL(stack)[bp+i];
 			PUSH(v != UNBOUND ? FL(t) : FL(f));
 			NEXT_OP;
 
 		OP(OP_KEYARGS)
-			v = fn_vals(FL(Stack)[bp-1]);
+			v = fn_vals(FL(stack)[bp-1]);
 			v = vector_elt(v, 0);
 			i = GET_INT32(ip);
 			ip += 4;
@@ -1739,7 +1739,7 @@
 			ip += 4;
 			s = GET_INT32(ip);
 			ip += 4;
-			FL(Stack)[ipd] = (uintptr_t)ip;
+			FL(stack)[ipd] = (uintptr_t)ip;
 			nargs = process_keys(v, i, n, labs(s)-(i+n), bp, nargs, s<0);
 			NEXT_OP;
 		}
@@ -1784,21 +1784,21 @@
 
 	fl_gc_handle(&lst);
 	while(top > 0){
-		const uint8_t *ip1 = (void*)FL(Stack)[top-2];
-		uint32_t sz = FL(Stack)[top-3]+1;
+		const uint8_t *ip1 = (void*)FL(stack)[top-2];
+		uint32_t sz = FL(stack)[top-3]+1;
 		uint32_t bp = top-5-sz;
-		value_t func = FL(Stack)[bp];
+		value_t func = FL(stack)[bp];
 		const uint8_t *ip0 = cv_data((cvalue_t*)ptr(fn_bcode(func)));
 		value_t ip = ip1 - ip0 - 1; /* -1: ip1 is *after* the one that was being executed */
 		value_t v = alloc_vector(sz+1, 0);
 		vector_elt(v, 0) = fixnum(ip);
 		vector_elt(v, 1) = func;
-		if(FL(Stack)[top-1] /*captured*/){
+		if(FL(stack)[top-1] /*captured*/){
 			memmove(&vector_elt(v, 2),
-				   &vector_elt(FL(Stack)[bp+1], 0), (sz-1)*sizeof(value_t));
+				   &vector_elt(FL(stack)[bp+1], 0), (sz-1)*sizeof(value_t));
 		}else{
 			for(uint32_t i = 1; i < sz; i++){
-				value_t si = FL(Stack)[bp+i];
+				value_t si = FL(stack)[bp+i];
 				// if there's an error evaluating argument defaults some slots
 				// might be left set to UNBOUND (issue #22)
 				vector_elt(v, i+1) = si == UNBOUND ? FL(unspecified) : si;
@@ -1805,7 +1805,7 @@
 			}
 		}
 		lst = fl_cons(v, lst);
-		top = FL(Stack)[top-4];
+		top = FL(stack)[top-4];
 	}
 	fl_free_gc_handles(1);
 	return lst;
@@ -1965,24 +1965,24 @@
 	if(!iscons(args[1]))
 		return FL(Nil);
 	value_t first, last, v;
-	int64_t argSP = args-FL(Stack);
-	assert(argSP >= 0 && argSP < FL(N_STACK));
+	int64_t argSP = args-FL(stack);
+	assert(argSP >= 0 && argSP < FL(nstack));
 	if(nargs == 2){
-		if(FL(SP)+3 > FL(N_STACK))
+		if(FL(sp)+3 > FL(nstack))
 			grow_stack();
-		PUSH(FL(Stack)[argSP]);
-		PUSH(car_(FL(Stack)[argSP+1]));
+		PUSH(FL(stack)[argSP]);
+		PUSH(car_(FL(stack)[argSP+1]));
 		v = _applyn(1);
 		PUSH(v);
 		v = mk_cons();
 		car_(v) = POP(); cdr_(v) = FL(Nil);
 		last = first = v;
-		FL(Stack)[argSP+1] = cdr_(FL(Stack)[argSP+1]);
+		FL(stack)[argSP+1] = cdr_(FL(stack)[argSP+1]);
 		fl_gc_handle(&first);
 		fl_gc_handle(&last);
-		while(iscons(FL(Stack)[argSP+1])){
-			FL(Stack)[FL(SP)-2] = FL(Stack)[argSP];
-			FL(Stack)[FL(SP)-1] = car_(FL(Stack)[argSP+1]);
+		while(iscons(FL(stack)[argSP+1])){
+			FL(stack)[FL(sp)-2] = FL(stack)[argSP];
+			FL(stack)[FL(sp)-1] = car_(FL(stack)[argSP+1]);
 			v = _applyn(1);
 			PUSH(v);
 			v = mk_cons();
@@ -1989,18 +1989,18 @@
 			car_(v) = POP(); cdr_(v) = FL(Nil);
 			cdr_(last) = v;
 			last = v;
-			FL(Stack)[argSP+1] = cdr_(FL(Stack)[argSP+1]);
+			FL(stack)[argSP+1] = cdr_(FL(stack)[argSP+1]);
 		}
 		POPN(2);
 		fl_free_gc_handles(2);
 	}else{
 		int i;
-		while(FL(SP)+nargs+1 > FL(N_STACK))
+		while(FL(sp)+nargs+1 > FL(nstack))
 			grow_stack();
-		PUSH(FL(Stack)[argSP]);
+		PUSH(FL(stack)[argSP]);
 		for(i = 1; i < nargs; i++){
-			PUSH(car(FL(Stack)[argSP+i]));
-			FL(Stack)[argSP+i] = cdr_(FL(Stack)[argSP+i]);
+			PUSH(car(FL(stack)[argSP+i]));
+			FL(stack)[argSP+i] = cdr_(FL(stack)[argSP+i]);
 		}
 		v = _applyn(nargs-1);
 		POPN(nargs);
@@ -2010,11 +2010,11 @@
 		last = first = v;
 		fl_gc_handle(&first);
 		fl_gc_handle(&last);
-		while(iscons(FL(Stack)[argSP+1])){
-			PUSH(FL(Stack)[argSP]);
+		while(iscons(FL(stack)[argSP+1])){
+			PUSH(FL(stack)[argSP]);
 			for(i = 1; i < nargs; i++){
-				PUSH(car(FL(Stack)[argSP+i]));
-				FL(Stack)[argSP+i] = cdr_(FL(Stack)[argSP+i]);
+				PUSH(car(FL(stack)[argSP+i]));
+				FL(stack)[argSP+i] = cdr_(FL(stack)[argSP+i]);
 			}
 			v = _applyn(nargs-1);
 			POPN(nargs);
@@ -2052,7 +2052,7 @@
 	int i;
 
 	memset(&fl, 0, sizeof(fl));
-	FL(SCR_WIDTH) = 80;
+	FL(scr_width) = 80;
 
 	FL(heapsize) = initial_heapsize;
 
@@ -2063,8 +2063,8 @@
 	FL(consflags) = bitvector_new(FL(heapsize)/sizeof(cons_t), 1);
 	htable_new(&FL(printconses), 32);
 	comparehash_init();
-	FL(N_STACK) = 262144;
-	FL(Stack) = LLT_ALLOC(FL(N_STACK)*sizeof(value_t));
+	FL(nstack) = 262144;
+	FL(stack) = LLT_ALLOC(FL(nstack)*sizeof(value_t));
 
 	FL(Nil) = builtin(OP_THE_EMPTY_LIST);
 	FL(t) = builtin(OP_BOOL_CONST_T);
@@ -2122,7 +2122,7 @@
 	FL(builtins_table_sym) = symbol("*builtins*");
 	set(FL(printprettysym) = symbol("*print-pretty*"), FL(t));
 	set(FL(printreadablysym) = symbol("*print-readably*"), FL(t));
-	set(FL(printwidthsym) = symbol("*print-width*"), fixnum(FL(SCR_WIDTH)));
+	set(FL(printwidthsym) = symbol("*print-width*"), fixnum(FL(scr_width)));
 	set(FL(printlengthsym) = symbol("*print-length*"), FL(f));
 	set(FL(printlevelsym) = symbol("*print-level*"), FL(f));
 	FL(lasterror) = FL(Nil);
@@ -2181,17 +2181,17 @@
 	symbol_t *sym;
 
 	PUSH(sys_image_iostream);
-	saveSP = FL(SP);
+	saveSP = FL(sp);
 	FL_TRY{
 		while(1){
-			e = fl_read_sexpr(FL(Stack)[FL(SP)-1]);
-			if(ios_eof(value2c(ios_t*, FL(Stack)[FL(SP)-1])))
+			e = fl_read_sexpr(FL(stack)[FL(sp)-1]);
+			if(ios_eof(value2c(ios_t*, FL(stack)[FL(sp)-1])))
 				break;
 			if(isfunction(e)){
 				// stage 0 format: series of thunks
 				PUSH(e);
 				(void)_applyn(0);
-				FL(SP) = saveSP;
+				FL(sp) = saveSP;
 			}else{
 				// stage 1 format: list alternating symbol/value
 				while(iscons(e)){
@@ -2211,7 +2211,7 @@
 		ios_putc('\n', ios_stderr);
 		return 1;
 	}
-	ios_close(value2c(ios_t*, FL(Stack)[FL(SP)-1]));
+	ios_close(value2c(ios_t*, FL(stack)[FL(sp)-1]));
 	POPN(1);
 	return 0;
 }
--- a/flisp.h
+++ b/flisp.h
@@ -154,13 +154,13 @@
 
 #define PUSH(v) \
 	do{ \
-		FL(Stack)[FL(SP)++] = (v); \
+		FL(stack)[FL(sp)++] = (v); \
 	}while(0)
 #define POPN(n) \
 	do{ \
-		FL(SP) -= (n); \
+		FL(sp) -= (n); \
 	}while(0)
-#define POP() (FL(Stack)[--FL(SP)])
+#define POP() (FL(stack)[--FL(sp)])
 
 int isbuiltin(value_t x);
 void fl_init(size_t initial_heapsize);
@@ -326,14 +326,15 @@
 typedef struct Fl Fl;
 
 struct Fl {
-	value_t *Stack;
-	uint32_t SP;
-	uint32_t N_STACK;
+	value_t *stack;
+	uint32_t sp;
 	uint32_t curr_frame;
-	value_t *GCHandleStack[N_GC_HANDLES];
-	uint32_t N_GCHND;
-	symbol_t *symtab;
+	value_t Nil, t, f;
 
+	value_t *gchandles[N_GC_HANDLES];
+	uint32_t ngchandles;
+	uint32_t nstack;
+
 	uint8_t *fromspace;
 	uint8_t *tospace;
 	uint8_t *curheap;
@@ -342,6 +343,7 @@
 	uint32_t *consflags;
 
 	fl_readstate_t *readstate;
+	symbol_t *symtab;
 
 	// saved execution state for an unwind target
 	fl_exception_context_t *exctx;
@@ -348,7 +350,7 @@
 	uint32_t throwing_frame;  // active frame when exception was thrown
 	value_t lasterror;
 
-	value_t Nil, t, f, eof, quote;
+	value_t eof, quote;
 	value_t lambda, trycatch;
 	value_t backquote, comma, commaat, commadot, function;
 
@@ -396,11 +398,11 @@
 	fltype_t *builtintype;
 
 	size_t malloc_pressure;
-	cvalue_t **Finalizers;
+	cvalue_t **finalizers;
 	size_t nfinalizers;
 	size_t maxfinalizers;
 
-	uint32_t _gensym_ctr;
+	uint32_t gensym_ctr;
 	// two static buffers for gensym printing so there can be two
 	// gensym names available at a time, mostly for compare()
 	char gsname[2][16];
@@ -418,9 +420,9 @@
 	int print_princ;
 	fixnum_t print_length;
 	fixnum_t print_level;
-	fixnum_t P_LEVEL;
-	int SCR_WIDTH;
-	int HPOS, VPOS;
+	fixnum_t p_level;
+	int scr_width;
+	int hpos, vpos;
 };
 
 extern Fl fl;
--- a/print.c
+++ b/print.c
@@ -12,9 +12,9 @@
 {
 	ios_putc(c, f);
 	if(c == '\n')
-		FL(HPOS) = 0;
+		FL(hpos) = 0;
 	else
-		FL(HPOS)++;
+		FL(hpos)++;
 }
 
 static void
@@ -21,7 +21,7 @@
 outs(char *s, ios_t *f)
 {
 	ios_puts(s, f);
-	FL(HPOS) += u8_strwidth(s);
+	FL(hpos) += u8_strwidth(s);
 }
 
 static void
@@ -28,7 +28,7 @@
 outsn(char *s, ios_t *f, size_t n)
 {
 	ios_write(f, s, n);
-	FL(HPOS) += u8_strwidth(s);
+	FL(hpos) += u8_strwidth(s);
 }
 
 static int
@@ -35,12 +35,12 @@
 outindent(int n, ios_t *f)
 {
 	// move back to left margin if we get too indented
-	if(n > FL(SCR_WIDTH)-12)
+	if(n > FL(scr_width)-12)
 		n = 2;
 	int n0 = n;
 	ios_putc('\n', f);
-	FL(VPOS)++;
-	FL(HPOS) = n;
+	FL(vpos)++;
+	FL(hpos) = n;
 	while(n >= 8){
 		ios_putc('\t', f);
 		n -= 8;
@@ -294,9 +294,9 @@
 		fl_print_child(f, car_(cdr_(v)));
 		return;
 	}
-	int startpos = FL(HPOS);
+	int startpos = FL(hpos);
 	outc('(', f);
-	int newindent = FL(HPOS), blk = blockindent(v);
+	int newindent = FL(hpos), blk = blockindent(v);
 	int lastv, n = 0, si, ind, est, always = 0, nextsmall, thistiny;
 	if(!blk)
 		always = indentevery(v);
@@ -310,7 +310,7 @@
 			outsn("...)", f, 4);
 			break;
 		}
-		lastv = FL(VPOS);
+		lastv = FL(vpos);
 		unmark_cons(v);
 		fl_print_child(f, car_(v));
 		if(!iscons(cd) || ptrhash_has(&FL(printconses), (void*)cd)){
@@ -330,12 +330,12 @@
 			est = lengthestimate(car_(cd));
 			nextsmall = smallp(car_(cd));
 			thistiny = tinyp(car_(v));
-			ind = (((FL(VPOS) > lastv) ||
-					(FL(HPOS)>FL(SCR_WIDTH)/2 && !nextsmall && !thistiny && n>0)) ||
+			ind = (((FL(vpos) > lastv) ||
+					(FL(hpos)>FL(scr_width)/2 && !nextsmall && !thistiny && n>0)) ||
 
-				   (FL(HPOS) > FL(SCR_WIDTH)-4) ||
+				   (FL(hpos) > FL(scr_width)-4) ||
 
-				   (est != -1 && (FL(HPOS)+est > FL(SCR_WIDTH)-2)) ||
+				   (est != -1 && (FL(hpos)+est > FL(scr_width)-2)) ||
 
 				   ((head == FL(lambda)) && !nextsmall) ||
 
@@ -361,7 +361,7 @@
 				if(si != -1)
 					newindent = startpos + si;
 				else if(!blk)
-					newindent = FL(HPOS);
+					newindent = FL(hpos);
 			}
 		}
 		n++;
@@ -377,10 +377,10 @@
 	value_t label;
 	if((label = (value_t)ptrhash_get(&FL(printconses), (void*)v)) != (value_t)HT_NOTFOUND){
 		if(!ismarked(v)){
-			FL(HPOS) += ios_printf(f, "#%"PRIdPTR"#", numval(label));
+			FL(hpos) += ios_printf(f, "#%"PRIdPTR"#", numval(label));
 			return 1;
 		}
-		FL(HPOS) += ios_printf(f, "#%"PRIdPTR"=", numval(label));
+		FL(hpos) += ios_printf(f, "#%"PRIdPTR"=", numval(label));
 	}
 	if(ismanaged(v))
 		unmark_cons(v);
@@ -391,15 +391,15 @@
 fl_print_child(ios_t *f, value_t v)
 {
 	char *name;
-	if(FL(print_level) >= 0 && FL(P_LEVEL) >= FL(print_level) && (iscons(v) || isvector(v) || isclosure(v))){
+	if(FL(print_level) >= 0 && FL(p_level) >= FL(print_level) && (iscons(v) || isvector(v) || isclosure(v))){
 		outc('#', f);
 		return;
 	}
-	FL(P_LEVEL)++;
+	FL(p_level)++;
 
 	switch(tag(v)){
 	case TAG_NUM: case TAG_NUM1:
-		FL(HPOS) += ios_printf(f, "%"PRId64, (int64_t)numval(v));
+		FL(hpos) += ios_printf(f, "%"PRId64, (int64_t)numval(v));
 		break;
 	case TAG_SYM:
 		name = symbol_name(v);
@@ -467,7 +467,7 @@
 			break;
 		if(isvector(v)){
 			outs("#(", f);
-			int newindent = FL(HPOS), est;
+			int newindent = FL(hpos), est;
 			int i, sz = vector_size(v);
 			for(i = 0; i < sz; i++){
 				if(FL(print_length) >= 0 && i >= FL(print_length) && i < sz-1){
@@ -480,9 +480,9 @@
 						outc(' ', f);
 					else{
 						est = lengthestimate(vector_elt(v, i+1));
-						if(FL(HPOS) > FL(SCR_WIDTH)-4 ||
-						   (est != -1 && (FL(HPOS)+est > FL(SCR_WIDTH)-2)) ||
-						   (FL(HPOS) > FL(SCR_WIDTH)/2 && !smallp(vector_elt(v, i+1)) && !tinyp(vector_elt(v, i))))
+						if(FL(hpos) > FL(scr_width)-4 ||
+						   (est != -1 && (FL(hpos)+est > FL(scr_width)-2)) ||
+						   (FL(hpos) > FL(scr_width)/2 && !smallp(vector_elt(v, i+1)) && !tinyp(vector_elt(v, i))))
 							newindent = outindent(newindent, f);
 						else
 							outc(' ', f);
@@ -498,7 +498,7 @@
 			print_pair(f, v);
 		break;
 	}
-	FL(P_LEVEL)--;
+	FL(p_level)--;
 }
 
 static void
@@ -627,9 +627,9 @@
 		if(FL(print_princ))
 			outc(ch, f);
 		else if(weak)
-			FL(HPOS) += ios_printf(f, "0x%hhx", ch);
+			FL(hpos) += ios_printf(f, "0x%hhx", ch);
 		else
-			FL(HPOS) += ios_printf(f, "#byte(0x%hhx)", ch);
+			FL(hpos) += ios_printf(f, "#byte(0x%hhx)", ch);
 	}else if(type == FL(runesym)){
 		Rune r = *(Rune*)data;
 		char seq[UTFmax+1];
@@ -655,7 +655,7 @@
 				if(u8_iswprint(r))
 					outs(seq, f);
 				else
-					FL(HPOS) += ios_printf(f, "x%04x", r);
+					FL(hpos) += ios_printf(f, "x%04x", r);
 				break;
 			}
 		}
@@ -677,7 +677,7 @@
 			else
 				rep = signbit(d) ? "-inf.0" : "+inf.0";
 			if(type == FL(floatsym) && !FL(print_princ) && !weak)
-				FL(HPOS) += ios_printf(f, "#%s(%s)", symbol_name(type), rep);
+				FL(hpos) += ios_printf(f, "#%s(%s)", symbol_name(type), rep);
 			else
 				outs(rep, f);
 		}else if(d == 0){
@@ -703,16 +703,16 @@
 #endif
 		uint64_t ui64 = *(uint64_t*)data;
 		if(weak || FL(print_princ))
-			FL(HPOS) += ios_printf(f, "%"PRIu64, ui64);
+			FL(hpos) += ios_printf(f, "%"PRIu64, ui64);
 		else
-			FL(HPOS) += ios_printf(f, "#%s(%"PRIu64")", symbol_name(type), ui64);
+			FL(hpos) += ios_printf(f, "#%s(%"PRIu64")", symbol_name(type), ui64);
 	}else if(type == FL(bignumsym)){
 		mpint *i = *(mpint**)data;
 		char *s = mptoa(i, 10, nil, 0);
 		if(weak || FL(print_princ))
-			FL(HPOS) += ios_printf(f, "%s", s);
+			FL(hpos) += ios_printf(f, "%s", s);
 		else
-			FL(HPOS) += ios_printf(f, "#%s(%s)", symbol_name(type), s);
+			FL(hpos) += ios_printf(f, "#%s(%s)", symbol_name(type), s);
 		LLT_FREE(s);
 	}else if(issymbol(type)){
 		// handle other integer prims. we know it's smaller than uint64
@@ -721,11 +721,11 @@
 		if(valid_numtype(nt)){
 			int64_t i64 = conv_to_int64(data, nt);
 			if(weak || FL(print_princ))
-				FL(HPOS) += ios_printf(f, "%"PRId64, i64);
+				FL(hpos) += ios_printf(f, "%"PRId64, i64);
 			else
-				FL(HPOS) += ios_printf(f, "#%s(%"PRId64")", symbol_name(type), i64);
+				FL(hpos) += ios_printf(f, "#%s(%"PRId64")", symbol_name(type), i64);
 		}else{
-			FL(HPOS) += ios_printf(f, "#<%s>", symbol_name(type));
+			FL(hpos) += ios_printf(f, "#<%s>", symbol_name(type));
 		}
 	}else if(iscons(type)){
 		if(car_(type) == FL(arraysym)){
@@ -747,9 +747,9 @@
 					/*
 					char *nl = llt_memrchr(data, '\n', len);
 					if(nl)
-						FL(HPOS) = u8_strwidth(nl+1);
+						FL(hpos) = u8_strwidth(nl+1);
 					else
-						FL(HPOS) += u8_strwidth(data);
+						FL(hpos) += u8_strwidth(data);
 					*/
 				}else{
 					outc('"', f);
@@ -822,7 +822,7 @@
 		void *fptr = *(void**)data;
 		label = (value_t)ptrhash_get(&FL(reverse_dlsym_lookup_table), cv);
 		if(label == (value_t)HT_NOTFOUND){
-			FL(HPOS) += ios_printf(f, "#<builtin @%p>", fptr);
+			FL(hpos) += ios_printf(f, "#<builtin @%p>", fptr);
 		}else{
 			if(FL(print_princ)){
 				outs(symbol_name(label), f);
@@ -847,7 +847,7 @@
 	value_t pw = symbol_value(FL(printwidthsym));
 	if(!isfixnum(pw))
 		return;
-	FL(SCR_WIDTH) = numval(pw);
+	FL(scr_width) = numval(pw);
 }
 
 void
@@ -861,12 +861,12 @@
 	FL(print_length) = isfixnum(pl) ? numval(pl) : -1;
 	pl = symbol_value(FL(printlevelsym));
 	FL(print_level) = isfixnum(pl) ? numval(pl) : -1;
-	FL(P_LEVEL) = 0;
+	FL(p_level) = 0;
 
 	FL(printlabel) = 0;
 	if(!FL(print_princ))
 		print_traverse(v);
-	FL(HPOS) = FL(VPOS) = 0;
+	FL(hpos) = FL(vpos) = 0;
 
 	fl_print_child(f, v);
 
--- a/read.c
+++ b/read.c
@@ -441,11 +441,11 @@
 	PUSH(v);
 	assert(s+d > s);
 	value_t newv = alloc_vector(s+d, 1);
-	v = FL(Stack)[FL(SP)-1];
+	v = FL(stack)[FL(sp)-1];
 	for(i = 0; i < s; i++)
 		vector_elt(newv, i) = vector_elt(v, i);
 	// use gc to rewrite references from the old vector to the new
-	FL(Stack)[FL(SP)-1] = newv;
+	FL(stack)[FL(sp)-1] = newv;
 	if(s > 0){
 		((size_t*)ptr(v))[0] |= 0x1;
 		vector_elt(v, 0) = newv;
@@ -466,12 +466,12 @@
 		if(ios_eof(RS))
 			lerrorf(FL(ParseError), "unexpected end of input");
 		if(i >= vector_size(v)){
-			v = FL(Stack)[FL(SP)-1] = vector_grow(v);
+			v = FL(stack)[FL(sp)-1] = vector_grow(v);
 			if(label != UNBOUND)
 				ptrhash_put(&FL(readstate)->backrefs, (void*)label, (void*)v);
 		}
 		elt = do_read_sexpr(UNBOUND);
-		v = FL(Stack)[FL(SP)-1];
+		v = FL(stack)[FL(sp)-1];
 		assert(i < vector_size(v));
 		vector_elt(v, i) = elt;
 		i++;
@@ -578,7 +578,7 @@
 	uint32_t t;
 
 	PUSH(FL(Nil));
-	pc = &FL(Stack)[FL(SP)-1];  // to keep track of current cons cell
+	pc = &FL(stack)[FL(sp)-1];  // to keep track of current cons cell
 	t = peek();
 	while(t != closer){
 		if(ios_eof(RS))
@@ -660,7 +660,7 @@
 		if(label != UNBOUND)
 			ptrhash_put(&FL(readstate)->backrefs, (void*)label, (void*)v);
 		v = do_read_sexpr(UNBOUND);
-		car_(cdr_(FL(Stack)[FL(SP)-1])) = v;
+		car_(cdr_(FL(stack)[FL(sp)-1])) = v;
 		return POP();
 	case TOK_SHARPQUOTE:
 		// femtoLisp doesn't need symbol-function, so #' does nothing
@@ -667,15 +667,15 @@
 		return do_read_sexpr(label);
 	case TOK_OPEN:
 		PUSH(FL(Nil));
-		read_list(&FL(Stack)[FL(SP)-1], label, TOK_CLOSE);
+		read_list(&FL(stack)[FL(sp)-1], label, TOK_CLOSE);
 		return POP();
 	case TOK_OPENB:
 		PUSH(FL(Nil));
-		read_list(&FL(Stack)[FL(SP)-1], label, TOK_CLOSEB);
+		read_list(&FL(stack)[FL(sp)-1], label, TOK_CLOSEB);
 		return POP();
 	case TOK_OPENC:
 		PUSH(FL(Nil));
-		read_list(&FL(Stack)[FL(SP)-1], label, TOK_CLOSEC);
+		read_list(&FL(stack)[FL(sp)-1], label, TOK_CLOSEC);
 		return POP();
 	case TOK_SHARPSYM:
 		sym = tokval;
@@ -690,10 +690,10 @@
 			lerrorf(FL(ParseError), "expected argument list for %s", symbol_name(tokval));
 		}
 		PUSH(FL(Nil));
-		read_list(&FL(Stack)[FL(SP)-1], UNBOUND, TOK_CLOSE);
+		read_list(&FL(stack)[FL(sp)-1], UNBOUND, TOK_CLOSE);
 		if(sym == FL(vu8sym)){
 			sym = FL(arraysym);
-			FL(Stack)[FL(SP)-1] = fl_cons(FL(uint8sym), FL(Stack)[FL(SP)-1]);
+			FL(stack)[FL(sp)-1] = fl_cons(FL(uint8sym), FL(stack)[FL(sp)-1]);
 		}else if(sym == FL(fnsym)){
 			sym = FL(function);
 		}