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MIT/X Consortium License

(C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the 
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in 
all copies or substantial portions of the Software. 

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.
*/ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
//: Support jumps to labels.
//: We'll also treat 'break' and 'continue' as jumps. The choice of name is
//: just documentation about intent.

:(scenario jump_to_label)
recipe main [
  jump +target:offset
  1:number <- copy 0:literal
  +target
]
-mem: storing 0 in location 1

:(after "int main")
  Transform.push_back(transform_labels);

:(code)
void transform_labels(const recipe_number r) {
  map<string, index_t> offset;
  for (index_t i = 0; i < Recipe[r].steps.size(); ++i) {
    const instruction& inst = Recipe[r].steps.at(i);
    if (!inst.label.empty()) offset[inst.label] = i;
  }
  for (index_t i = 0; i < Recipe[r].steps.size(); ++i) {
    instruction& inst = Recipe[r].steps.at(i);
    if (inst.operation == Recipe_number["jump"]) {
//?       cerr << inst.to_string() << '\n'; //? 1
      replace_offset(inst.ingredients.at(0), offset, i, r);
    }
    if (inst.operation == Recipe_number["jump-if"] || inst.operation == Recipe_number["jump-unless"]) {
      replace_offset(inst.ingredients.at(1), offset, i, r);
    }
    if ((inst.operation == Recipe_number["loop"] || inst.operation == Recipe_number["break"])
        && inst.ingredients.size() == 1) {
      replace_offset(inst.ingredients.at(0), offset, i, r);
    }
    if ((inst.operation == Recipe_number["loop-if"] || inst.operation == Recipe_number["loop-unless"]
            || inst.operation == Recipe_number["break-if"] || inst.operation == Recipe_number["break-unless"])
        && inst.ingredients.size() == 2) {
      replace_offset(inst.ingredients.at(1), offset, i, r);
    }
  }
}

:(code)
void replace_offset(reagent& x, /*const*/ map<string, index_t>& offset, const index_t current_offset, const recipe_number r) {
//?   cerr << "AAA " << x.to_string() << '\n'; //? 1
  assert(isa_literal(x));
//?   cerr << "BBB " << x.to_string() << '\n'; //? 1
  assert(!x.initialized);
//?   cerr << "CCC " << x.to_string() << '\n'; //? 1
  if (is_number(x.name)) return;  // non-labels will be handled like other number operands
//?   cerr << "DDD " << x.to_string() << '\n'; //? 1
  if (offset.find(x.name) == offset.end())
    raise << "can't find label " << x.name << " in routine " << Recipe[r].name << '\n';
  x.set_value(offset[x.name]-current_offset);
}

:(scenario break_to_label)
recipe main [
#?   $print [aaa]
  {
    {
      break +target:offset
      1:number <- copy 0:literal
    }
  }
  +target
]
-mem: storing 0 in location 1

:(scenario jump_if_to_label)
recipe main [
  {
    {
      jump-if 1:literal, +target:offset
      1:number <- copy 0:literal
    }
  }
  +target
]
-mem: storing 0 in location 1

:(scenario loop_unless_to_label)
recipe main [
  {
    {
      loop-unless 0:literal, +target:offset  # loop/break with a label don't care about braces
      1:number <- copy 0:literal
    }
  }
  +target
]
-mem: storing 0 in location 1

:(scenario jump_runs_code_after_label)
recipe main [
  # first a few lines of padding to exercise the offset computation
  1:number <- copy 0:literal
  2:number <- copy 0:literal
  3:number <- copy 0:literal
  jump +target:offset
  4:number <- copy 0:literal
  +target
  5:number <- copy 0:literal
]
+mem: storing 0 in location 5
-mem: storing 0 in location 4