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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: {
trace("run") << "ingredient 0 is " << instructions[pc].ingredients[0].value;
pc += instructions[pc].ingredients[0].value;
trace("run") << "pc now " << pc;
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: {
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 += instructions[pc].ingredients[1].value;
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 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: {
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 += instructions[pc].ingredients[1].value;
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 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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