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Diffstat (limited to 'archive/2.vm/028call_return.cc')
-rw-r--r-- | archive/2.vm/028call_return.cc | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/archive/2.vm/028call_return.cc b/archive/2.vm/028call_return.cc deleted file mode 100644 index 056db7b9..00000000 --- a/archive/2.vm/028call_return.cc +++ /dev/null @@ -1,197 +0,0 @@ -//: Calls can also generate products, using 'reply' or 'return'. - -void test_return() { - run( - "def main [\n" - " 1:num, 2:num <- f 34\n" - "]\n" - "def f [\n" - " 12:num <- next-ingredient\n" - " 13:num <- add 1, 12:num\n" - " return 12:num, 13:num\n" - "]\n" - ); - CHECK_TRACE_CONTENTS( - "mem: storing 34 in location 1\n" - "mem: storing 35 in location 2\n" - ); -} - -void test_reply() { - run( - "def main [\n" - " 1:num, 2:num <- f 34\n" - "]\n" - "def f [\n" - " 12:num <- next-ingredient\n" - " 13:num <- add 1, 12:num\n" - " reply 12:num, 13:num\n" - "]\n" - ); - CHECK_TRACE_CONTENTS( - "mem: storing 34 in location 1\n" - "mem: storing 35 in location 2\n" - ); -} - -:(before "End Primitive Recipe Declarations") -RETURN, -:(before "End Primitive Recipe Numbers") -put(Recipe_ordinal, "return", RETURN); -put(Recipe_ordinal, "reply", RETURN); // synonym while teaching -put(Recipe_ordinal, "output", RETURN); // experiment -:(before "End Primitive Recipe Checks") -case RETURN: { - break; // checks will be performed by a transform below -} -:(before "End Primitive Recipe Implementations") -case RETURN: { - // Begin Return - trace(Callstack_depth+1, "trace") << current_instruction().name << ": decrementing callstack depth from " << Callstack_depth << end(); - --Callstack_depth; - if (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; - for (int i = 0; i < SIZE(ingredients); ++i) - trace(Callstack_depth+1, "run") << "result " << i << " is " << to_string(ingredients.at(i)) << end(); - // make return products available to caller - copy(ingredients.begin(), ingredients.end(), inserter(products, products.begin())); - // End Return - break; // continue to process rest of *caller* instruction -} - -//: Types in return instructions are checked ahead of time. - -:(before "End Checks") -Transform.push_back(check_types_of_return_instructions); // idempotent -:(code) -void check_types_of_return_instructions(const recipe_ordinal r) { - const recipe& caller = get(Recipe, r); - trace(9991, "transform") << "--- check types of return 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 (is_primitive(caller_instruction.operation)) continue; - const recipe& callee = get(Recipe, caller_instruction.operation); - for (int i = 0; i < SIZE(callee.steps); ++i) { - const instruction& return_inst = callee.steps.at(i); - if (return_inst.operation != RETURN) continue; - // check types with the caller - if (SIZE(caller_instruction.products) > SIZE(return_inst.ingredients)) { - raise << maybe(caller.name) << "too few values returned from " << callee.name << '\n' << end(); - break; - } - for (int i = 0; i < SIZE(caller_instruction.products); ++i) { - reagent/*copy*/ lhs = return_inst.ingredients.at(i); - reagent/*copy*/ rhs = caller_instruction.products.at(i); - // End Check RETURN Copy(lhs, rhs) - if (!types_coercible(rhs, lhs)) { - raise << maybe(callee.name) << return_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_return_check; - } - } - // check that any return 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(return_inst.ingredients.at(i), "same-as-ingredient")) { - string_tree* tmp = property(return_inst.ingredients.at(i), "same-as-ingredient"); - if (!tmp || !tmp->atom) { - raise << maybe(caller.name) << "'same-as-ingredient' metadata should take exactly one value in '" << to_original_string(return_inst) << "'\n" << end(); - goto finish_return_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_return_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_return_check:; - } - } -} - -bool is_primitive(recipe_ordinal r) { - return r < MAX_PRIMITIVE_RECIPES; -} - -void test_return_type_mismatch() { - Hide_errors = true; - run( - "def main [\n" - " 3:num <- f 2\n" - "]\n" - "def f [\n" - " 12:num <- next-ingredient\n" - " 13:num <- copy 35\n" - " 14:point <- copy 12:point/raw\n" - " return 14:point\n" - "]\n" - ); - CHECK_TRACE_CONTENTS( - "error: f: return ingredient '14:point' can't be saved in '3:num'\n" - ); -} - -//: 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 'return' indicates that an ingredient is intended to be -//: modified in place, and will help catch accidental misuse of such -//: 'ingredient-products' (sometimes called in-out parameters in other -//: languages). - -void test_return_same_as_ingredient() { - Hide_errors = true; - run( - "def main [\n" - " 1:num <- copy 0\n" - " 2:num <- test1 1:num # call with different ingredient and product\n" - "]\n" - "def test1 [\n" - " 10:num <- next-ingredient\n" - " return 10:num/same-as-ingredient:0\n" - "]\n" - ); - CHECK_TRACE_CONTENTS( - "error: main: '2:num <- test1 1:num' should write to '1:num' rather than '2:num'\n" - ); -} - -void test_return_same_as_ingredient_dummy() { - run( - "def main [\n" - " 1:num <- copy 0\n" - " _ <- test1 1:num # call with different ingredient and product\n" - "]\n" - "def test1 [\n" - " 10:num <- next-ingredient\n" - " return 10:num/same-as-ingredient:0\n" - "]\n" - ); - CHECK_TRACE_COUNT("error", 0); -} - -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(); -} |