Add Lua 5.1 source files and documentation, including core libraries, interpreter, and test scripts.

ref/lua-5.1/test/trace-calls.lua

@@ -0,0 +1,32 @@
+-- trace calls
+-- example: lua -ltrace-calls bisect.lua
+
+local level=0
+
+local function hook(event)
+ local t=debug.getinfo(3)
+ io.write(level," >>> ",string.rep(" ",level))
+ if t~=nil and t.currentline>=0 then io.write(t.short_src,":",t.currentline," ") end
+ t=debug.getinfo(2)
+ if event=="call" then
+  level=level+1
+ else
+  level=level-1 if level<0 then level=0 end
+ end
+ if t.what=="main" then
+  if event=="call" then
+   io.write("begin ",t.short_src)
+  else
+   io.write("end ",t.short_src)
+  end
+ elseif t.what=="Lua" then
+-- table.foreach(t,print)
+  io.write(event," ",t.name or "(Lua)"," <",t.linedefined,":",t.short_src,">")
+ else
+ io.write(event," ",t.name or "(C)"," [",t.what,"] ")
+ end
+ io.write("\n")
+end
+
+debug.sethook(hook,"cr")
+level=0