Chip-8-Wizardry/chalk
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Properly throw away unused expressions in blocks.

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This commit is contained in:
Danila Fedorin 2018-08-05 13:35:16 -07:00
parent caaae87344
commit a96d503095
1 changed files with 4 additions and 2 deletions
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6
src/chalk/codegen.cr
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@ -90,8 +90,10 @@ module Chalk
generate! tree, entry.function, table, target, free generate! tree, entry.function, table, target, free
when Trees::TreeBlock when Trees::TreeBlock
table = Table.new(table) table = Table.new(table)
throwaway = free
free += 1
tree.children.each do |child| tree.children.each do |child|
free += generate! child, table, free, free + 1 free += generate! child, table, throwaway, free
end end
when Trees::TreeVar when Trees::TreeVar
entry = table[tree.name]? entry = table[tree.name]?
@ -143,7 +145,7 @@ module Chalk
# Generates code for the function that was given to it. # Generates code for the function that was given to it.
def generate! def generate!
generate!(@function.block, @table, -1, @registers) generate!(@function.block, @table, 0, @registers)
return @instructions return @instructions
end end
end end