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:(before "End Globals")
// Jump ops.
const int JUMP = 10;
:(before "End Primitive Recipe Numbers")
Recipe_number["jump"] = JUMP;
Next_recipe_number++;
:(before "End Primitive Recipe Implementations")
case JUMP: {
trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].name;
pc += to_int(instructions[pc].ingredients[0].name);
break;
}
:(scenario "jump_can_skip_instructions")
recipe main [
jump 1:offset
1:integer <- copy 1:literal
]
+run: instruction 0
+run: ingredient 0 is 1
-run: instruction 1
-mem: storing in location 1
:(scenario "jump_backward")
recipe main [
jump 1:offset // 0 -+
jump 1:offset // | 1 +-+
jump -2:offset // 2 +-->+ |
] // 3 \/
+run: instruction 0
+run: instruction 2
+run: instruction 1
:(before "End Globals")
const int JUMP_IF = 11;
:(before "End Primitive Recipe Numbers")
Recipe_number["jump-if"] = JUMP_IF;
Next_recipe_number++;
:(before "End Primitive Recipe Implementations")
case JUMP_IF: {
vector<int> arg0 = read_memory(instructions[pc].ingredients[0]);
assert(arg0.size() == 1);
trace("run") << "ingredient 0 is " << arg0[0];
if (!arg0[0]) {
trace("run") << "jump-if fell through";
break;
}
trace("run") << "ingredient 1 is " << instructions[pc].ingredients[1].name;
pc += to_int(instructions[pc].ingredients[1].name);
trace("run") << "jumping to instruction " << pc+1;
break;
}
:(scenario "jump_if")
recipe main [
jump-if 999:literal 1:offset
1:integer <- copy 1:literal
]
+run: instruction 0
+run: ingredient 1 is 1
+run: jumping to instruction 2
-run: instruction 1
-mem: storing in location 1
:(scenario "jump_if_fallthrough")
recipe main [
jump-if 0:literal 1:offset
123:integer <- copy 1:literal
]
+run: instruction 0
+run: jump-if fell through
+run: instruction 1
+mem: storing in location 123
:(before "End Globals")
const int JUMP_UNLESS = 12;
:(before "End Primitive Recipe Numbers")
Recipe_number["jump-unless"] = JUMP_UNLESS;
Next_recipe_number++;
:(before "End Primitive Recipe Implementations")
case JUMP_UNLESS: {
vector<int> arg0 = read_memory(instructions[pc].ingredients[0]);
assert(arg0.size() == 1);
trace("run") << "ingredient 0 is " << arg0[0];
if (arg0[0]) {
trace("run") << "jump-unless fell through";
break;
}
trace("run") << "ingredient 1 is " << instructions[pc].ingredients[1].name;
pc += to_int(instructions[pc].ingredients[1].name);
trace("run") << "jumping to instruction " << pc+1;
break;
}
:(scenario "jump_unless")
recipe main [
jump-unless 0:literal 1:offset
1:integer <- copy 1:literal
]
+run: instruction 0
+run: ingredient 1 is 1
+run: jumping to instruction 2
-run: instruction 1
-mem: storing in location 1
:(scenario "jump_unless_fallthrough")
recipe main [
jump-unless 999:literal 1:offset
123:integer <- copy 1:literal
]
+run: instruction 0
+run: ingredient 0 is 999
+run: jump-unless fell through
+run: instruction 1
+mem: storing in location 123
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