module transform
import astbuilder
-import auto_super_init
import astvalidation
+import semantize
+intrude import semantize::scope
redef class ToolContext
var transform_phase: Phase = new TransformPhase(self, [typing_phase, auto_super_init_phase])
+
+ # --no-shortcut-range
+ var opt_no_shortcut_range: OptionBool = new OptionBool("Always insantiate a range and its iterator on 'for' loops", "--no-shortcut-range")
+
+ redef init
+ do
+ super
+ self.option_context.add_option(self.opt_no_shortcut_range)
+ end
end
private class TransformPhase
do
var val
- var v = new TransformVisitor(self, npropdef)
+ var v = new TransformVisitor(self, npropdef.mpropdef.as(not null))
v.enter_visit(npropdef)
val = new ASTValidationVisitor
super Visitor
var phase: TransformPhase
- var mmodule: MModule
- var mclassdef: MClassDef
+ var mmodule: MModule is noinit
+ var mclassdef: MClassDef is noinit
var mpropdef: MPropDef
- var builder: ASTBuilder
+ var builder: ASTBuilder is noinit
- init(phase: TransformPhase, npropdef: APropdef)
+ init
do
- self.phase = phase
- self.mpropdef = npropdef.mpropdef.as(not null)
self.mclassdef = mpropdef.mclassdef
self.mmodule = mclassdef.mmodule
self.builder = new ASTBuilder(mmodule, mpropdef.mclassdef.bound_mtype)
redef class AWhileExpr
redef fun accept_transform_visitor(v)
do
- # TODO
+ var nloop = v.builder.make_loop
+ var nif = v.builder.make_if(n_expr, null)
+ nloop.add nif
+
+ var nblock = n_block
+ if nblock != null then nif.n_then.add nblock
+
+ var escapemark = self.break_mark.as(not null)
+ var nbreak = v.builder.make_break(escapemark)
+ nif.n_else.add nbreak
+
+ nloop.break_mark = self.break_mark
+ nloop.continue_mark = self.continue_mark
+
+ replace_with(nloop)
end
end
redef class AForExpr
redef fun accept_transform_visitor(v)
do
- # TODO
+ var escapemark = self.break_mark
+ assert escapemark != null
+
+ var nblock = v.builder.make_block
+
+ var nexpr = n_expr
+
+ # Shortcut on explicit range
+ # Avoid the instantiation of the range and the iterator
+ if self.variables.length == 1 and nexpr isa ARangeExpr and not v.phase.toolcontext.opt_no_shortcut_range.value then
+ var variable = variables.first
+ nblock.add v.builder.make_var_assign(variable, nexpr.n_expr)
+ var to = nexpr.n_expr2
+ nblock.add to
+
+ var nloop = v.builder.make_loop
+ nloop.break_mark = escapemark
+ nblock.add nloop
+
+ var is_ok = v.builder.make_call(v.builder.make_var_read(variable, variable.declared_type.as(not null)), method_lt.as(not null), [to.make_var_read])
+
+ var nif = v.builder.make_if(is_ok, null)
+ nloop.add nif
+
+ var nthen = nif.n_then
+ var ndo = v.builder.make_do
+ ndo.break_mark = escapemark.continue_mark
+ nthen.add ndo
+
+ ndo.add self.n_block.as(not null)
+
+ var one = v.builder.make_int(1)
+ var succ = v.builder.make_call(v.builder.make_var_read(variable, variable.declared_type.as(not null)), method_successor.as(not null), [one])
+ nthen.add v.builder.make_var_assign(variable, succ)
+
+ var nbreak = v.builder.make_break(escapemark)
+ nif.n_else.add nbreak
+
+ replace_with(nblock)
+ return
+ end
+
+ nblock.add nexpr
+
+ var iter = v.builder.make_call(nexpr.make_var_read, method_iterator.as(not null), null)
+ nblock.add iter
+
+ var nloop = v.builder.make_loop
+ nloop.break_mark = escapemark
+ nblock.add nloop
+
+ var is_ok = v.builder.make_call(iter.make_var_read, method_is_ok.as(not null), null)
+
+ var nif = v.builder.make_if(is_ok, null)
+ nloop.add nif
+
+ var nthen = nif.n_then
+ var ndo = v.builder.make_do
+ ndo.break_mark = escapemark.continue_mark
+ nthen.add ndo
+
+ if self.variables.length == 1 then
+ var item = v.builder.make_call(iter.make_var_read, method_item.as(not null), null)
+ ndo.add v.builder.make_var_assign(variables.first, item)
+ else if self.variables.length == 2 then
+ var key = v.builder.make_call(iter.make_var_read, method_key.as(not null), null)
+ ndo.add v.builder.make_var_assign(variables[0], key)
+ var item = v.builder.make_call(iter.make_var_read, method_item.as(not null), null)
+ ndo.add v.builder.make_var_assign(variables[1], item)
+ else
+ abort
+ end
+
+ ndo.add self.n_block.as(not null)
+
+ nthen.add v.builder.make_call(iter.make_var_read, method_next.as(not null), null)
+
+ var nbreak = v.builder.make_break(escapemark)
+ nif.n_else.add nbreak
+
+ var method_finish = self.method_finish
+ if method_finish != null then
+ nblock.add v.builder.make_call(iter.make_var_read, method_finish, null)
+ end
+
+ replace_with(nblock)
end
end
# `[x..y]` is replaced with `new Range[X](x,y)`
redef fun accept_transform_visitor(v)
do
+ if parent isa AForExpr then return # to permit shortcut ranges
replace_with(v.builder.make_new(init_callsite.as(not null), [n_expr, n_expr2]))
end
end
# `[x..y[` is replaced with `new Range[X].without_last(x,y)`
redef fun accept_transform_visitor(v)
do
+ if parent isa AForExpr then return # to permit shortcut ranges
replace_with(v.builder.make_new(init_callsite.as(not null), [n_expr, n_expr2]))
end
end
nitlanguage / nit.git / blobdiff