forked from Mirror/wren
c5befa72cf
This is an interim step towards supporting relative imports. Previously, the IMPORT_VARIABLE instruction had a constant string operand for the import string of the module to import the variable from. However, with relative imports, the import string needs to be resolved by the host all into a canonical import string. At that point, the original import string in the source is no longer useful. This changes that to have IMPORT_VARIABLE access the imported ObjModule directly. It works in two pieces: 1. When a module is compiled, it ends with an END_MODULE instruction. That instruction stores the current ObjModule in vm->lastModule. 2. The IMPORT_VARIABLE instruction uses vm->lastModule as the module to load the variable from. Since no interesting code can execute between when a module body completes and the subsequent IMPORT_VARIABLE statements, we know vm->lastModule will be the one we imported.