diff options
Diffstat (limited to '028call_reply.cc')
| -rw-r--r-- | 028call_reply.cc | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/028call_reply.cc b/028call_reply.cc new file mode 100644 index 00000000..df5fa557 --- /dev/null +++ b/028call_reply.cc @@ -0,0 +1,230 @@ +//: Calls can also generate products, using 'reply' or 'return'. + +:(scenario reply) +def main [ + 1:number, 2:number <- f 34 +] +def f [ + 12:number <- next-ingredient + 13:number <- add 1, 12:number + reply 12:number, 13:number +] ++mem: storing 34 in location 1 ++mem: storing 35 in location 2 + +:(before "End Primitive Recipe Declarations") +REPLY, +:(before "End Primitive Recipe Numbers") +put(Recipe_ordinal, "reply", REPLY); +put(Recipe_ordinal, "return", REPLY); +:(before "End Primitive Recipe Checks") +case REPLY: { + break; // checks will be performed by a transform below +} +:(before "End Primitive Recipe Implementations") +case REPLY: { + // Starting Reply + if (Trace_stream) { + trace(9999, "trace") << "reply: decrementing callstack depth from " << Trace_stream->callstack_depth << end(); + --Trace_stream->callstack_depth; + if (Trace_stream->callstack_depth < 0) { + Current_routine->calls.clear(); + goto stop_running_current_routine; + } + } + Current_routine->calls.pop_front(); + // just in case 'main' returns a value, drop it for now + if (Current_routine->calls.empty()) goto stop_running_current_routine; + const instruction& caller_instruction = current_instruction(); + for (int i = 0; i < SIZE(caller_instruction.products); ++i) + trace(9998, "run") << "result " << i << " is " << to_string(ingredients.at(i)) << end(); + + // make reply products available to caller + copy(ingredients.begin(), ingredients.end(), inserter(products, products.begin())); + // End Reply + break; // continue to process rest of *caller* instruction +} + +//: Types in reply instructions are checked ahead of time. + +:(before "End Checks") +Transform.push_back(check_types_of_reply_instructions); +:(code) +void check_types_of_reply_instructions(recipe_ordinal r) { + const recipe& caller = get(Recipe, r); + trace(9991, "transform") << "--- check types of reply instructions in recipe " << caller.name << end(); + for (int i = 0; i < SIZE(caller.steps); ++i) { + const instruction& caller_instruction = caller.steps.at(i); + if (caller_instruction.is_label) continue; + if (caller_instruction.products.empty()) continue; + if (caller_instruction.operation < MAX_PRIMITIVE_RECIPES) continue; + const recipe& callee = get(Recipe, caller_instruction.operation); + for (int i = 0; i < SIZE(callee.steps); ++i) { + const instruction& reply_inst = callee.steps.at(i); + if (reply_inst.operation != REPLY) continue; + // check types with the caller + if (SIZE(caller_instruction.products) > SIZE(reply_inst.ingredients)) { + raise << maybe(caller.name) << "too few values replied from " << callee.name << '\n' << end(); + break; + } + for (int i = 0; i < SIZE(caller_instruction.products); ++i) { + reagent lhs = reply_inst.ingredients.at(i); + reagent rhs = caller_instruction.products.at(i); + // End Check REPLY Copy(lhs, rhs) + if (!types_coercible(rhs, lhs)) { + raise << maybe(callee.name) << reply_inst.name << " ingredient " << lhs.original_string << " can't be saved in " << rhs.original_string << '\n' << end(); + raise << to_string(lhs.type) << " vs " << to_string(rhs.type) << '\n' << end(); + goto finish_reply_check; + } + } + // check that any reply ingredients with /same-as-ingredient connect up + // the corresponding ingredient and product in the caller. + for (int i = 0; i < SIZE(caller_instruction.products); ++i) { + if (has_property(reply_inst.ingredients.at(i), "same-as-ingredient")) { + string_tree* tmp = property(reply_inst.ingredients.at(i), "same-as-ingredient"); + if (!tmp || tmp->right) { + raise << maybe(caller.name) << "'same-as-ingredient' metadata should take exactly one value in " << to_original_string(reply_inst) << '\n' << end(); + goto finish_reply_check; + } + int ingredient_index = to_integer(tmp->value); + if (ingredient_index >= SIZE(caller_instruction.ingredients)) { + raise << maybe(caller.name) << "too few ingredients in '" << to_original_string(caller_instruction) << "'\n" << end(); + goto finish_reply_check; + } + if (!is_dummy(caller_instruction.products.at(i)) && !is_literal(caller_instruction.ingredients.at(ingredient_index)) && caller_instruction.products.at(i).name != caller_instruction.ingredients.at(ingredient_index).name) { + raise << maybe(caller.name) << "'" << to_original_string(caller_instruction) << "' should write to " << caller_instruction.ingredients.at(ingredient_index).original_string << " rather than " << caller_instruction.products.at(i).original_string << '\n' << end(); + } + } + } + finish_reply_check:; + } + } +} + +:(scenario reply_type_mismatch) +% Hide_errors = true; +def main [ + 3:number <- f 2 +] +def f [ + 12:number <- next-ingredient + 13:number <- copy 35 + 14:point <- copy 12:point/raw + return 14:point +] ++error: f: return ingredient 14:point can't be saved in 3:number + +//: In mu we'd like to assume that any instruction doesn't modify its +//: ingredients unless they're also products. The /same-as-ingredient inside +//: the recipe's 'reply' will help catch accidental misuse of such +//: 'ingredient-products' (sometimes called in-out parameters in other languages). + +:(scenario reply_same_as_ingredient) +% Hide_errors = true; +def main [ + 1:number <- copy 0 + 2:number <- test1 1:number # call with different ingredient and product +] +def test1 [ + 10:number <- next-ingredient + return 10:number/same-as-ingredient:0 +] ++error: main: '2:number <- test1 1:number' should write to 1:number rather than 2:number + +:(scenario reply_same_as_ingredient_dummy) +def main [ + 1:number <- copy 0 + _ <- test1 1:number # call with different ingredient and product +] +def test1 [ + 10:number <- next-ingredient + return 10:number/same-as-ingredient:0 +] +$error: 0 + +:(code) +string to_string(const vector<double>& in) { + if (in.empty()) return "[]"; + ostringstream out; + if (SIZE(in) == 1) { + out << no_scientific(in.at(0)); + return out.str(); + } + out << "["; + for (int i = 0; i < SIZE(in); ++i) { + if (i > 0) out << ", "; + out << no_scientific(in.at(i)); + } + out << "]"; + return out.str(); +} + +//: Conditional reply. + +:(scenario reply_if) +def main [ + 1:number <- test1 +] +def test1 [ + return-if 0, 34 + return 35 +] ++mem: storing 35 in location 1 + +:(scenario reply_if_2) +def main [ + 1:number <- test1 +] +def test1 [ + return-if 1, 34 + return 35 +] ++mem: storing 34 in location 1 + +:(before "End Rewrite Instruction(curr, recipe result)") +// rewrite `reply-if a, b, c, ...` to +// ``` +// jump-unless a, 1:offset +// reply b, c, ... +// ``` +if (curr.name == "reply-if" || curr.name == "return-if") { + if (curr.products.empty()) { + curr.operation = get(Recipe_ordinal, "jump-unless"); + curr.name = "jump-unless"; + vector<reagent> results; + copy(++curr.ingredients.begin(), curr.ingredients.end(), inserter(results, results.end())); + curr.ingredients.resize(1); + curr.ingredients.push_back(reagent("1:offset")); + result.steps.push_back(curr); + curr.clear(); + curr.operation = get(Recipe_ordinal, "reply"); + curr.name = "reply"; + curr.ingredients.swap(results); + } + else { + raise << "'" << curr.name << "' never yields any products\n" << end(); + } +} +// rewrite `reply-unless a, b, c, ...` to +// ``` +// jump-if a, 1:offset +// reply b, c, ... +// ``` +if (curr.name == "reply-unless" || curr.name == "return-unless") { + if (curr.products.empty()) { + curr.operation = get(Recipe_ordinal, "jump-if"); + curr.name = "jump-if"; + vector<reagent> results; + copy(++curr.ingredients.begin(), curr.ingredients.end(), inserter(results, results.end())); + curr.ingredients.resize(1); + curr.ingredients.push_back(reagent("1:offset")); + result.steps.push_back(curr); + curr.clear(); + curr.operation = get(Recipe_ordinal, "reply"); + curr.name = "reply"; + curr.ingredients.swap(results); + } + else { + raise << "'" << curr.name << "' never yields any products\n" << end(); + } +} |