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Global variables are now loaded from _ENV. #11

Merged
merged 2 commits into from
Jan 16, 2019
Merged

Global variables are now loaded from _ENV. #11

merged 2 commits into from
Jan 16, 2019

Commits on Jan 15, 2019

  1. Global variables are now loaded from _ENV. 

    In the Lua specification, the global variables are loaded from a global
table called `_ENV`. Programs can overwrite this variable as well, and
can read and write from/to it.
There are a few changes:
* The compiler:
  * assumes that `_ENV` is always stored in register 0
  * replaces all global variable writing, and reading with `GetAttr`, and
  `SetAttr` instructions
* The vm:
  * always creates a `LuaTable` and stores it in register 0, so that globals
can be easily accessed.
  * can now set and get attributes of `LuaTable`s
    @rbartlensky
    rbartlensky committed Jan 15, 2019
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  2. Update to grmtools 0.2.

    @rbartlensky
    rbartlensky committed Jan 15, 2019
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