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//: Jump primitives
:(before "End Primitive Recipe Declarations")
JUMP,
:(before "End Primitive Recipe Numbers")
Recipe_number["jump"] = JUMP;
:(before "End Primitive Recipe Implementations")
case JUMP: {
assert(current_instruction().ingredients.at(0).initialized);
assert(ingredients.size() == 1);
assert(ingredients.at(0).size() == 1); // scalar
instruction_counter += ingredients.at(0).at(0);
trace("run") << "jumping to instruction " << instruction_counter+1;
break;
}
:(scenario jump_can_skip_instructions)
recipe main [
jump 1:offset
1:integer <- copy 1:literal
]
+run: instruction main/0
+run: ingredient 0 is 1
-run: instruction main/1
-mem: storing 1 in location 1
:(scenario jump_backward)
recipe main [
jump 1:offset # 0 -+
jump 1:offset # | +-+ 1
# \/ /\ |
jump -2:offset # 2 +-->+ |
] # \/ 3
+run: instruction main/0
+run: instruction main/2
+run: instruction main/1
:(before "End Primitive Recipe Declarations")
JUMP_IF,
:(before "End Primitive Recipe Numbers")
Recipe_number["jump-if"] = JUMP_IF;
:(before "End Primitive Recipe Implementations")
case JUMP_IF: {
assert(current_instruction().ingredients.at(1).initialized);
assert(ingredients.size() == 2);
assert(ingredients.at(0).size() == 1); // scalar
if (!ingredients.at(0).at(0)) {
trace("run") << "jump-if fell through";
break;
}
assert(ingredients.at(1).size() == 1); // scalar
instruction_counter += ingredients.at(1).at(0);
trace("run") << "jumping to instruction " << instruction_counter+1;
break;
}
:(scenario jump_if)
recipe main [
jump-if 999:literal 1:offset
1:integer <- copy 1:literal
]
+run: instruction main/0
+run: ingredient 1 is 1
+run: jumping to instruction 2
-run: instruction main/1
-mem: storing 1 in location 1
:(scenario jump_if_fallthrough)
recipe main [
jump-if 0:literal 1:offset
123:integer <- copy 1:literal
]
+run: instruction main/0
+run: jump-if fell through
+run: instruction main/1
+mem: storing 1 in location 123
:(before "End Primitive Recipe Declarations")
JUMP_UNLESS,
:(before "End Primitive Recipe Numbers")
Recipe_number["jump-unless"] = JUMP_UNLESS;
:(before "End Primitive Recipe Implementations")
case JUMP_UNLESS: {
assert(current_instruction().ingredients.at(1).initialized);
assert(ingredients.size() == 2);
assert(ingredients.at(0).size() == 1); // scalar
if (ingredients.at(0).at(0)) {
trace("run") << "jump-unless fell through";
break;
}
assert(ingredients.at(1).size() == 1); // scalar
instruction_counter += ingredients.at(1).at(0);
trace("run") << "jumping to instruction " << instruction_counter+1;
break;
}
:(scenario jump_unless)
recipe main [
jump-unless 0:literal 1:offset
1:integer <- copy 1:literal
]
+run: instruction main/0
+run: ingredient 1 is 1
+run: jumping to instruction 2
-run: instruction main/1
-mem: storing 1 in location 1
:(scenario jump_unless_fallthrough)
recipe main [
jump-unless 999:literal 1:offset
123:integer <- copy 1:literal
]
+run: instruction main/0
+run: ingredient 0 is 999
+run: jump-unless fell through
+run: instruction main/1
+mem: storing 1 in location 123
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