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//: Support jumps to a specific label (the 'jump target') in the same recipe.
//: Jump targets must be unique and unambiguous within any recipe.
//:
//: The 'break' and 'loop' pseudo instructions can also take jump targets.
//: Which instruction you use is just documentation about intent; use 'break'
//: to indicate you're exiting one or more loop nests, and 'loop' to indicate
//: you're skipping to the next iteration of some containing loop nest.
//: Since they have to be unique in a recipe, not all labels can be jump
//: targets.
bool is_jump_target(const string& label) {
if (label == "{" || label == "}") return false;
// End is_jump_target Special-cases
return is_label_word(label);
}
void test_jump_to_label() {
run(
"def main [\n"
" jump +target:label\n"
" 1:num <- copy 0\n"
" +target\n"
"]\n"
);
CHECK_TRACE_DOESNT_CONTAIN("mem: storing 0 in location 1");
}
:(before "End Mu Types Initialization")
put(Type_ordinal, "label", 0);
:(before "End Instruction Modifying Transforms")
Transform.push_back(transform_labels); // idempotent
:(code)
void transform_labels(const recipe_ordinal r) {
map<string, int> offset;
for (int i = 0; i < SIZE(get(Recipe, r).steps); ++i) {
const instruction& inst = get(Recipe, r).steps.at(i);
if (!inst.is_label) continue;
if (is_jump_target(inst.label)) {
if (!contains_key(offset, inst.label)) {
put(offset, inst.label, i);
}
else {
raise << maybe(get(Recipe, r).name) << "duplicate label '" << inst.label << "'" << end();
// have all jumps skip some random but noticeable and deterministic amount of code
put(offset, inst.label, 9999);
}
}
}
for (int i = 0; i < SIZE(get(Recipe, r).steps); ++i) {
instruction& inst = get(Recipe, r).steps.at(i);
if (inst.name == "jump") {
if (inst.ingredients.empty()) {
raise << maybe(get(Recipe, r).name) << "'" << to_original_string(inst) << "' expects an ingredient but got 0\n" << end();
return;
}
replace_offset(inst.ingredients.at(0), offset, i, r);
}
if (inst.name == "jump-if" || inst.name == "jump-unless") {
if (SIZE(inst.ingredients) < 2) {
raise << maybe(get(Recipe, r).name) << "'" << to_original_string(inst) << "' expects 2 ingredients but got " << SIZE(inst.ingredients) << '\n' << end();
return;
}
replace_offset(inst.ingredients.at(1), offset, i, r);
}
if ((inst.name == "loop" || inst.name == "break")
&& SIZE(inst.ingredients) >= 1) {
replace_offset(inst.ingredients.at(0), offset, i, r);
}
if ((inst.name == "loop-if" || inst.name == "loop-unless"
|| inst.name == "break-if" || inst.name == "break-unless")
&& SIZE(inst.ingredients) >= 2) {
replace_offset(inst.ingredients.at(1), offset, i, r);
}
}
}
void replace_offset(reagent& x, /*const*/ map<string, int>& offset, const int current_offset, const recipe_ordinal r) {
if (!is_literal(x)) {
raise << maybe(get(Recipe, r).name) << "jump target must be offset or label but is '" << x.original_string << "'\n" << end();
x.set_value(0); // no jump by default
return;
}
if (x.initialized) return;
if (is_integer(x.name)) return; // non-labels will be handled like other number operands
if (!is_jump_target(x.name)) {
raise << maybe(get(Recipe, r).name) << "can't jump to label '" << x.name << "'\n" << end();
x.set_value(0); // no jump by default
return;
}
if (!contains_key(offset, x.name)) {
raise << maybe(get(Recipe, r).name) << "can't find label '" << x.name << "'\n" << end();
x.set_value(0); // no jump by default
return;
}
x.set_value(get(offset, x.name) - current_offset);
}
void test_break_to_label() {
run(
"def main [\n"
" {\n"
" {\n"
" break +target:label\n"
" 1:num <- copy 0\n"
" }\n"
" }\n"
" +target\n"
"]\n"
);
CHECK_TRACE_DOESNT_CONTAIN("mem: storing 0 in location 1");
}
void test_jump_if_to_label() {
run(
"def main [\n"
" {\n"
" {\n"
" jump-if 1, +target:label\n"
" 1:num <- copy 0\n"
" }\n"
" }\n"
" +target\n"
"]\n"
);
CHECK_TRACE_DOESNT_CONTAIN("mem: storing 0 in location 1");
}
void test_loop_unless_to_label() {
run(
"def main [\n"
" {\n"
" {\n"
" loop-unless 0, +target:label\n" // loop/break with a label don't care about braces
" 1:num <- copy 0\n"
" }\n"
" }\n"
" +target\n"
"]\n"
);
CHECK_TRACE_DOESNT_CONTAIN("mem: storing 0 in location 1");
}
void test_jump_runs_code_after_label() {
run(
"def main [\n"
// first a few lines of padding to exercise the offset computation
" 1:num <- copy 0\n"
" 2:num <- copy 0\n"
" 3:num <- copy 0\n"
" jump +target:label\n"
" 4:num <- copy 0\n"
" +target\n"
" 5:num <- copy 0\n"
"]\n"
);
CHECK_TRACE_CONTENTS(
"mem: storing 0 in location 5\n"
);
CHECK_TRACE_DOESNT_CONTAIN("mem: storing 0 in location 4");
}
void test_jump_fails_without_target() {
Hide_errors = true;
run(
"def main [\n"
" jump\n"
"]\n"
);
CHECK_TRACE_CONTENTS(
"error: main: 'jump' expects an ingredient but got 0\n"
);
}
void test_jump_fails_without_target_2() {
Hide_errors = true;
run(
"def main [\n"
" jump-if true\n"
"]\n"
);
CHECK_TRACE_CONTENTS(
"error: main: 'jump-if true' expects 2 ingredients but got 1\n"
);
}
void test_recipe_fails_on_duplicate_jump_target() {
Hide_errors = true;
run(
"def main [\n"
" +label\n"
" 1:num <- copy 0\n"
" +label\n"
" 2:num <- copy 0\n"
"]\n"
);
CHECK_TRACE_CONTENTS(
"error: main: duplicate label '+label'\n"
);
}
void test_jump_ignores_nontarget_label() {
Hide_errors = true;
run(
"def main [\n"
// first a few lines of padding to exercise the offset computation
" 1:num <- copy 0\n"
" 2:num <- copy 0\n"
" 3:num <- copy 0\n"
" jump $target:label\n"
" 4:num <- copy 0\n"
" $target\n"
" 5:num <- copy 0\n"
"]\n"
);
CHECK_TRACE_CONTENTS(
"error: main: can't jump to label '$target'\n"
);
}
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