Chip-8-Wizardry/chalk
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Add while loop

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This commit is contained in:
Danila Fedorin 2018-07-28 17:43:05 -07:00
parent 35b9c7651a
commit 75e031745b
1 changed files with 14 additions and 2 deletions
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16
src/chalk/codegen.cr
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@ -103,8 +103,8 @@ module Chalk
entry.is_a?(VarEntry)
generate! tree.expr, table, entry.register, free
when TreeIf
generate! tree.condition, table, target, free
sne target, 0
generate! tree.condition, table, free, free + 1
sne free, 0
jump_inst = jr 0
old_size = @instructions.size
@ -115,6 +115,18 @@ module Chalk
old_size = @instructions.size
generate! tree.otherwise, table, free, free + 1 if tree.otherwise
jump_after.offset = @instructions.size - old_size + 1
when TreeWhile
before_cond = @instructions.size
generate! tree.condition, table, free, free + 1
sne target, 0
cond_jump = jr 0
old_size = @instructions.size
generate! tree.block, table, free, free + 1
after_jump = jr 0
cond_jump.offset = @instructions.size - old_size + 1
after_jump.offset = before_cond - instructions.size + 1
when TreeReturn
generate! tree.rvalue, table, RETURN_REG, free
ret