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//: Jump primitives
:(scenario jump_can_skip_instructions)
def main [
jump 1:offset
1:number <- copy 1
]
+run: jump 1:offset
-run: 1:number <- copy 1
-mem: storing 1 in location 1
:(before "End Primitive Recipe Declarations")
JUMP,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "jump", JUMP);
:(before "End Primitive Recipe Checks")
case JUMP: {
if (SIZE(inst.ingredients) != 1) {
raise << maybe(get(Recipe, r).name) << "'jump' requires exactly one ingredient, but got " << to_string(inst) << '\n' << end();
break;
}
if (!is_mu_scalar(inst.ingredients.at(0))) {
raise << maybe(get(Recipe, r).name) << "first ingredient of 'jump' should be a label or offset, but got " << inst.ingredients.at(0).original_string << '\n' << end();
break;
}
break;
}
:(before "End Primitive Recipe Implementations")
case JUMP: {
assert(current_instruction().ingredients.at(0).initialized);
current_step_index() += ingredients.at(0).at(0)+1;
trace(9998, "run") << "jumping to instruction " << current_step_index() << end();
continue; // skip rest of this instruction
}
//: special type to designate jump targets
:(before "End Mu Types Initialization")
put(Type_ordinal, "offset", 0);
:(scenario jump_backward)
def main [
jump 1:offset # 0 -+
jump 3:offset # | +-+ 1
# \/ /\ |
jump -2:offset # 2 +-->+ |
] # \/ 3
+run: jump 1:offset
+run: jump -2:offset
+run: jump 3:offset
:(before "End Primitive Recipe Declarations")
JUMP_IF,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "jump-if", JUMP_IF);
:(before "End Primitive Recipe Checks")
case JUMP_IF: {
if (SIZE(inst.ingredients) != 2) {
raise << maybe(get(Recipe, r).name) << "'jump-if' requires exactly two ingredients, but got " << to_string(inst) << '\n' << end();
break;
}
if (!is_mu_scalar(inst.ingredients.at(0))) {
raise << maybe(get(Recipe, r).name) << "'jump-if' requires a boolean for its first ingredient, but got " << inst.ingredients.at(0).original_string << '\n' << end();
break;
}
if (!is_mu_scalar(inst.ingredients.at(1))) {
raise << maybe(get(Recipe, r).name) << "'jump-if' requires a label or offset for its second ingredient, but got " << inst.ingredients.at(0).original_string << '\n' << end();
break;
}
break;
}
:(before "End Primitive Recipe Implementations")
case JUMP_IF: {
assert(current_instruction().ingredients.at(1).initialized);
if (!ingredients.at(0).at(0)) {
trace(9998, "run") << "jump-if fell through" << end();
break;
}
current_step_index() += ingredients.at(1).at(0)+1;
trace(9998, "run") << "jumping to instruction " << current_step_index() << end();
continue; // skip rest of this instruction
}
:(scenario jump_if)
def main [
jump-if 999, 1:offset
123:number <- copy 1
]
+run: jump-if 999, 1:offset
+run: jumping to instruction 2
-run: 1:number <- copy 1
-mem: storing 1 in location 123
:(scenario jump_if_fallthrough)
def main [
jump-if 0, 1:offset
123:number <- copy 1
]
+run: jump-if 0, 1:offset
+run: jump-if fell through
+run: 123:number <- copy 1
+mem: storing 1 in location 123
:(before "End Primitive Recipe Declarations")
JUMP_UNLESS,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "jump-unless", JUMP_UNLESS);
:(before "End Primitive Recipe Checks")
case JUMP_UNLESS: {
if (SIZE(inst.ingredients) != 2) {
raise << maybe(get(Recipe, r).name) << "'jump-unless' requires exactly two ingredients, but got " << to_string(inst) << '\n' << end();
break;
}
if (!is_mu_scalar(inst.ingredients.at(0))) {
raise << maybe(get(Recipe, r).name) << "'jump-unless' requires a boolean for its first ingredient, but got " << inst.ingredients.at(0).original_string << '\n' << end();
break;
}
if (!is_mu_scalar(inst.ingredients.at(1))) {
raise << maybe(get(Recipe, r).name) << "'jump-unless' requires a label or offset for its second ingredient, but got " << inst.ingredients.at(0).original_string << '\n' << end();
break;
}
break;
}
:(before "End Primitive Recipe Implementations")
case JUMP_UNLESS: {
assert(current_instruction().ingredients.at(1).initialized);
if (ingredients.at(0).at(0)) {
trace(9998, "run") << "jump-unless fell through" << end();
break;
}
current_step_index() += ingredients.at(1).at(0)+1;
trace(9998, "run") << "jumping to instruction " << current_step_index() << end();
continue; // skip rest of this instruction
}
:(scenario jump_unless)
def main [
jump-unless 0, 1:offset
123:number <- copy 1
]
+run: jump-unless 0, 1:offset
+run: jumping to instruction 2
-run: 123:number <- copy 1
-mem: storing 1 in location 123
:(scenario jump_unless_fallthrough)
def main [
jump-unless 999, 1:offset
123:number <- copy 1
]
+run: jump-unless 999, 1:offset
+run: jump-unless fell through
+run: 123:number <- copy 1
+mem: storing 1 in location 123
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