diff --git a/amogus.h b/amogus.h
index 4cab2c3..0983a12 100644
--- a/amogus.h
+++ b/amogus.h
@@ -3,13 +3,12 @@
 // Parse regex. Find matching string.
 // If found:
 //   call callback(
-//     matched string (only valid before callback return),
+//     matched string (only valid until callback return),
 //     length of the string including NUL delimiter,
-//     data passed in the data argument
 //   )
 //   return 0
 // Else:
-//   return 1
+//   return ERR
 
-typedef void (entry_callback)(char* match, int size, void* data);
-int entry(char* regex, entry_callback *callback, void *data);
+typedef void(entry_callback)(char *match, int size, void *data);
+int entry(char *regex, entry_callback *callback, void *data);
diff --git a/amogus.png b/amogus.png
new file mode 100644
index 0000000..1890982
Binary files /dev/null and b/amogus.png differ
diff --git a/build b/build
index 42be51a..180aece 100755
--- a/build
+++ b/build
@@ -2,9 +2,17 @@
 mkdir -p target
 ./charjmpt.lua > target/charjmpt.s
 gcc -c meow.s -o target/amogus.o || exit
-gnu() { shift 1 && clang "$@"; }
-"$(command -v ~/stuff/zig/zig || echo gnu)" \
-cc -O3 -shared -static -nostdlib -nodefaultlibs target/amogus.o -o target/amogus || exit
+if command -v ~/stuff/zig/zig >/dev/null; then
+	~/stuff/zig/zig cc -shared -nostdlib target/amogus.o -o target/amogus || exit
+elif command -v ld.lld >/dev/null; then
+	ld.lld -shared -nostdlib target/amogus.o -o target/amogus || exit
+else
+	gcc -shared -nostdlib target/amogus.o -o target/amogus || exit
+fi
+#gnu() { shift 1 && gcc "$@"; }
+#"$(command -v ~/stuff/zig/zig || echo gnu)" \
+#cc -shared -nostdlib target/amogus.o -o target/amogus || exit
+#ld.lld -shared -nostdlib target/amogus.o -o target/amogus || exit
 objdump -d target/amogus
 cp target/amogus target/amogstrip
 strip -K entry target/amogstrip
@@ -14,4 +22,5 @@ rm -rf target/cg/
 mkdir -p target/cg
 cp target/amogstrip target/cg/amogus
 cp amogus.h target/cg/
+cp amogus.png target/cg/
 
diff --git a/charjmpt.lua b/charjmpt.lua
index c9d7d41..dc44c22 100755
--- a/charjmpt.lua
+++ b/charjmpt.lua
@@ -2,9 +2,15 @@
 print("charjmpt:")
 chars = {
 	['\0'] = "parse_exit",
+	['('] = "parse_grbegin",
+	[')'] = "parse_grend",
+	['\\'] = "parse_escape",
+	['|'] = "parse_nextalt",
+	['['] = "parse_murder",
+	['*'] = "parse_erase",
 }
 local def = "parse_self"
 for n=0,255 do
 	local c = string.char(n)
-	print("\t.4byte "..(chars[c] or "parse_self").." - charjmpt_prej")
+	print("\t.2byte "..(chars[c] or "parse_self").." - charjmpt_prej")
 end
diff --git a/ctest b/ctest
index 5c3b0db..8f890a8 100755
--- a/ctest
+++ b/ctest
@@ -4,8 +4,13 @@ export C_INCLUDE_PATH="$PWD:$C_INCLUDE_PATH"
 export LD_LIBRARY_PATH="$PWD/target:$LD_LIBRARY_PATH"
 export LIBRARY_PATH="$PWD/target:$LIBRARY_PATH"
 gcc -O2 test.c -o target/cmogus -L"$LIBRARY_PATH" -l:amogus || exit
-gdb -q \
-	-iex 'set confirm no' \
-	-ex 'layout asm' \
-	-ex 'start' \
-		target/cmogus
+if [ -z "$NODEBUG" ];
+then
+	gdb -q \
+		-iex 'set confirm no' \
+		-ex 'layout asm' \
+		-ex 'start' \
+			target/cmogus
+else
+	target/cmogus
+fi
diff --git a/meow.s b/meow.s
index dd01cfc..f0aea36 100644
--- a/meow.s
+++ b/meow.s
@@ -2,6 +2,7 @@
 .type _start, @function
 .globl entry
 .type entry, @function
+
 _start:
 	pop %rax
 	mov %rax,argc(%rip)
@@ -36,18 +37,19 @@ usage:
 
 	ret
 
-# rdi - buf
-# -> rax - len
+// rdi - buf
+// -> rax - len
 strlen:
 	mov %rdi,%rsi
 	xor %rax,%rax
 	repne scasb
 	sub %rsi,%rdi
 	mov %rdi,%rax
+	dec %rax
 	ret
 
-# rdi - buf
-# rsi - len
+// rdi - buf
+// rsi - len
 write:
 	push %rdi
 	push %rsi
@@ -62,10 +64,12 @@ help0:
 	.ascii "Usage: "
 	.set help0l, .-help0
 help1:
-	.ascii " regex0 [regex1 ...]\nstdout: NUL-separated list of matching strings\n"
+	.ascii " regex0 [regex1 ...]\n"
+	.ascii "writes NUL-separated list of matching strings, one per regex to stdout\n"
+	.ascii "uses stack memory, consider disabling the limit if it segfaults\n"
 	.set help1l, .-help1
 
-# rdi - exit code
+// rdi - exit code
 _exit:
 	mov $0x3c,%rax
 	syscall
@@ -73,55 +77,180 @@ _exit:
 
 .include "target/charjmpt.s"
 
-# rdi - where
-# rsi - char
-#parse_...:
+.macro eaptrdiff32 ptr=%rax, out=%rax, off=0, tmp=%r11
+	eaptrdiff32.\@:
+	.if \ptr != \out
+	push \ptr
+	.endif
+	.if \off
+	add $\off,\ptr
+	.endif
+	push \tmp
+	mov \ptr,\tmp
+	movslq (\tmp),\tmp
+	add \tmp,\ptr
+	pop \tmp
+	.if \ptr != \out
+	mov \ptr,\out
+	pop \ptr
+	.endif
+.endm
+
+.macro mkptrdiff32 to=%r11, to_low=%r11d, ptr=%rax, off=0
+	mkptrdiff32.\@:
+	push \to
+	.if \off
+	push \ptr
+	add $\off,\ptr
+	.endif
+	sub \ptr,\to
+	movl \to_low,(\ptr)
+	.if \off
+	pop \ptr
+	.endif
+	pop \to
+.endm
+
+// rdi - &state
+// rsi - char
+// rcx, r8, r9, r10, r11 - scratch
+// r12 - real stack (rsp - fake stack)
+// -> rax - status
+//parse_...:
+
+append_tnode_recurse:
+
+
+// rdi - &group_alt
+// rsi - type
+// -> rax - text_node ptr
+push_tnode:
+	movslq (%rdi),%rcx
+	sub $(5*4),%r12
+	and $-8,%r12
+	movl %esi,0(%r12)
+	movl $0,4(%r12)
+	mov %r12,%rax
+	mkptrdiff32 %rax,%eax,%rdi
+	test %rcx,%rcx
+	jz ptn_ptout
+	add %rdi,%rcx
+	mkptrdiff32 %rax,%eax,%rcx,4
+	ptn_ptout:
+	movslq 4(%rdi),%rcx
+	test %rcx,%rcx
+	jnz ptn_jout
+	mkptrdiff32 %rax,%eax,%rdi,4
+	ptn_jout:
+	ret
+
+parse_escape:
+	incq (2*8)(%rdi)
+	mov (2*8)(%rdi),%rsi
+	movzbq (%rsi),%rsi
+	test %sil,%sil
+	jz parse_exit
+	jmp parse_self
 
 parse_self:
+	push %rdi
+	push %rsi
+	sub $2,%rsp
+	movw $0,(%rsp)
+	movb %sil,(%rsp)
+	mov %rsp,%rdi
+	mov $1,%rsi
+	call write
+	add $2,%rsp
+	pop %rsi
+	pop %rdi
+	push %rsi
+	movq (%rdi),%rax # rax - group
+	eaptrdiff32 %rax # rax - group_alt
+	mov %rax,%rdi
+	movslq (%rax),%r9
+	test %r9,%r9
+	jz ps_alloc
+	eaptrdiff32 %rax # rax - text_node
+	movl (%rax),%r9d
+	cmp $3,%r9d
+	je ps_noalloc
+	ps_alloc:
+	mov $3,%rsi
+	call push_tnode
+	dec %r12
+	mkptrdiff32 %r12,%r12d,%rax,(8+0) # text_chars.text
+	inc %r12
+	movl $0,(8+4)(%rax) # text_chars.len
+	ps_noalloc:
+	eaptrdiff32 %rax,%r9,(8+0)
+	pop %rsi
+	movl (8+4)(%rax),%r8d
+	sub %r8,%r9
+	movb %sil,(%r9)
+	incl (8+4)(%rax)
 	xor %rax,%rax
 	ret
 
+parse_grbegin:
+parse_grend:
+parse_murder:
+parse_nextalt:
+parse_erase:
 parse_exit:
 	mov $1,%rax
 	ret
 
-
-# rdi - regex
-# rsi - callback
-# rdx - cb data
+// rdi - regex
+// rsi - callback
+// rdx - cb data
 entry:
 	push %rbp
 	mov %rsp,%rbp
-	sub $48,%rsp
-	mov %rsi,-8(%rbp)
-	mov %rdx,-16(%rbp)
-	mov %rdi,-24(%rbp)
+	//    svregs   state   group   group_alt
+	//   (r12-r14)
+	sub $(3*8    + 5*8   + 3*4   + 3*4),%rsp
+	mov %r12,-8(%rbp)
+	mov %r13,-16(%rbp)
+	mov %r14,-24(%rbp)
+	mov %rsp,%r12
+	mov %rdi,(-3*8-5*8 + 2*8)(%rbp) # state.regchar
+	mov %rsi,(-3*8-5*8 + 3*8)(%rbp) # state.callback
+	mov %rdx,(-3*8-5*8 + 4*8)(%rbp) # state.cbdata
+	lea (-3*8-5*8-3*4)(%rbp),%r9
+	mov %r9,(-3*8-5*8 + 0*8)(%rbp) # state.mother_gr
+	mov %r9,(-3*8-5*8 + 1*8)(%rbp) # state.current_gr
+	lea (-3*8-5*8-3*4)(%rbp),%r9
+	lea (-3*8-5*8-3*4-3*4)(%rbp),%r8
+	mkptrdiff32 %r8,%r8d,%r9 # group.alts_tail
+	mkptrdiff32 %r8,%r8d,%r9,4 # group.alts_head
+	movl $0,(-3*8-5*8-3*4 + 2*4)(%rbp) # group.up
+	movl $0,(-3*8-5*8-3*4-3*4 + 0*4)(%rbp) # group_alt.text_tail
+	movl $0,(-3*8-5*8-3*4-3*4 + 1*4)(%rbp) # group_alt.text_head
+	movl $0,(-3*8-5*8-3*4-3*4 + 2*4)(%rbp) # group_alt.next
+	xchg %r12,%rsp
+	sub $512,%r12
 	entry_parse_begin:
-		movzbl (%rdi),%ecx
+		mov (-3*8-5*8 + 2*8)(%rbp),%rsi
+		movzbq (%rsi),%rsi # char to sil
 		lea charjmpt(%rip),%r11
-		movzx %cl,%r10
-		shl $2,%r10
+		movzx %sil,%r10
+		shl $1,%r10
 		add %r10,%r11
-		movsxd (%r11),%r11
+		movswq (%r11),%r11
 		charjmpt_prej:
 		lea charjmpt_prej(%rip),%r10
 		add %r10,%r11
-		mov %rdi,-32(%rbp)
+		lea (-3*8-5*8)(%rbp),%rdi # &state
 		call *%r11
 		test %rax,%rax
 		jnz entry_parse_end
-		mov -32(%rbp),%rdi
-		inc %rdi
+		incq (-3*8-5*8+2*8)(%rbp)
 		jmp entry_parse_begin
 	entry_parse_end:
-	mov %rdi,%rsi
-	mov -24(%rbp),%rdi
-	sub %rdi,%rsi
-	inc %rsi
-	mov -16(%rbp),%rdx
-	mov -8(%rbp),%r9
-	entry_pre_call:
-	call *%r9
+	mov -8(%rbp),%r12
+	mov -16(%rbp),%r13
+	mov -24(%rbp),%r14
 	mov %rbp,%rsp
 	pop %rbp
 	ret
diff --git a/regen.lua b/regen.lua
new file mode 100755
index 0000000..4dbca58
--- /dev/null
+++ b/regen.lua
@@ -0,0 +1,101 @@
+#!/usr/bin/env lua
+local chs={}
+local function dchar(n)
+	local ch=string.char(n)
+	local cho=ch
+	if ch:match("[^%w ]") then
+		ch="\\"..ch
+	end
+	chs[#chs+1]=function()
+		return ch,ch,cho
+	end
+end
+local recurse=0;
+local function dren()
+	return asterisked==0 and badl==0
+end
+local out=""
+for n=32,126 do
+	dchar(n)
+end
+chs[#chs+1]=function() return "([]*)","","" end
+local function charf()
+	local chl=chs
+	return function()
+		local c,b,o=chl[math.random(1,#chl)]()
+		return c,b,o
+	end
+end
+local str
+local char=charf()
+function str(n,bad)
+	local t={}
+	local ot={}
+	local ob={}
+	for x=1,n do
+		t[#t+1],ob[#ob+1],ot[#ot+1]=char()
+	end
+	if bad then
+		if n>0 then
+			t[math.random(1,#t)]=math.random()>0.5 and t[n].."[]" or "[]"..t[n]
+		else
+			t[#t+1]='[]'
+		end
+	end
+	return table.concat(t),bad and '' or table.concat(ob),bad and '' or table.concat(ot)
+end
+str=(function(str) return function(min,man,c)
+	local t={}
+	local goods={}
+	for n=1,1 do
+		local nn
+		repeat
+			nn=math.random(1,c)
+		until not goods[nn]
+		goods[nn]=true
+	end
+	local ot
+	local ob
+	for n=1,c do
+		local o
+		local oc
+		t[n],oc,o=str(math.random(min,man),not goods[n])
+		if goods[n] then
+			ot=o
+			ob=oc
+		end
+	end
+	return table.concat(t,'|'),ob,ot
+end end)(str);
+
+local mrecurse=0
+char=(function(char) return function()
+	local c,o
+	local b
+	local ast=math.random()<0.2
+	if math.random()<0.05*(1-math.atan(recurse*(1.5))/math.atan(math.huge)) then
+		local s
+		recurse=recurse+1
+		if recurse>mrecurse then
+			mrecurse=math.max(mrecurse,recurse)
+			io.stderr:write(mrecurse,' rec\n')
+		end
+		s,b,o=str(0,16,math.random(1,64))
+		recurse=recurse-1
+		c='('..s..')'
+	else
+		c,b,o=char()
+	end
+	if math.random()<0.2 then
+		c=c.."*"
+		b=c
+		o=''
+	end
+	return c,b,o
+end end)(char)
+
+local s,b,o=str(0,16,256)
+print(s)
+io.stderr:write(mrecurse,' rec\n')
+io.stderr:write(b,'\n')
+io.stderr:write(o,'\n')
diff --git a/structs.txt b/structs.txt
new file mode 100644
index 0000000..09a8d64
--- /dev/null
+++ b/structs.txt
@@ -0,0 +1,40 @@
+/*
+struct group {
+	alts_tail: group_alt ptrdiff32
+	alts_head: group_alt ptrdiff32
+	up: group ptrdiff32
+}
+
+struct group_alt {
+	text_tail: text_node ptrdiff32
+	text_head: text_node ptrdiff32
+	next: group_alt ptrdiff32
+}
+
+struct text_node {
+	type: i32 enum {
+		// null = 0
+		murder = 1 // union: void[0]
+		wiped = 2 // union: void[0]
+		chars = 3 // union: text_chars
+		group = 4 // union: group
+	}
+	next: text_node ptrdiff32
+	data: union ...
+}
+
+struct text_chars {
+	text: char[]rev ptrdiff32
+	len: u32
+}
+
+struct parse_state {
+	current_gr: group ptr64
+	mother_gr: group ptr64
+	regchar: char ptr64
+	callback: fn ptr64
+	cbdata: void ptr64
+	...?
+}
+*/
+