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test_jit_handlekey.js
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test_jit_handlekey.js
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// Reproduce "undeclared reg 0" MIR error: switch statement with many
// string-constant cases, method calls, and property access — matching
// the exact bytecode pattern of a TUI handleKey function.
const keys = {
UP: '\x1b[A',
DOWN: '\x1b[B',
RIGHT: '\x1b[C',
LEFT: '\x1b[D',
PAGE_UP: '\x1b[5~',
PAGE_DOWN: '\x1b[6~',
ENTER: '\r',
ESCAPE: '\x1b',
TAB: '\t',
BACKSPACE: '\x7f',
HOME: '\x1b[H',
END: '\x1b[F',
CTRL_C: '\x03',
};
const list = {
index: 0,
items: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
selectNext() { this.index = Math.min(this.items.length - 1, this.index + 1); },
selectPrev() { this.index = Math.max(0, this.index - 1); },
pageDown() { this.index = Math.min(this.items.length - 1, this.index + 5); },
pageUp() { this.index = Math.max(0, this.index - 5); },
getSelected() { return this.items[this.index]; },
};
const logList = {
index: 0,
items: ['a', 'b', 'c'],
selectNext() { this.index = Math.min(this.items.length - 1, this.index + 1); },
selectPrev() { this.index = Math.max(0, this.index - 1); },
pageDown() { this.index = Math.min(this.items.length - 1, this.index + 5); },
pageUp() { this.index = Math.max(0, this.index - 5); },
};
const state = {
view: 'tasks',
searchMode: false,
searchQuery: '',
taskFilter: 'all',
settingsIndex: 0,
};
let renderCount = 0;
function render() { renderCount++; }
// Use switch(key) — this generates DUP+CONST+SEQ+JMP_FALSE chains where
// the discriminant stays on the vstack across branch targets.
function handleKey(key) {
if (state.searchMode) {
if (key === keys.ESCAPE) {
state.searchMode = false;
state.searchQuery = '';
render();
return;
}
if (key === keys.ENTER) {
state.searchMode = false;
render();
return;
}
return;
}
switch (key) {
case 'q':
case keys.CTRL_C:
return;
case '1':
state.view = 'dashboard';
render();
break;
case '2':
state.view = 'tasks';
render();
break;
case '3':
state.view = 'logs';
render();
break;
case '4':
state.view = 'settings';
render();
break;
case '?':
render();
break;
case 'm':
render();
break;
case keys.UP:
case 'k':
if (state.view === 'tasks') list.selectPrev();
else if (state.view === 'logs') logList.selectPrev();
else if (state.view === 'settings') state.settingsIndex = Math.max(0, state.settingsIndex - 1);
render();
break;
case keys.DOWN:
case 'j':
if (state.view === 'tasks') list.selectNext();
else if (state.view === 'logs') logList.selectNext();
else if (state.view === 'settings') state.settingsIndex = Math.min(9, state.settingsIndex + 1);
render();
break;
case keys.PAGE_UP:
if (state.view === 'tasks') list.pageUp();
else if (state.view === 'logs') logList.pageUp();
render();
break;
case keys.PAGE_DOWN:
if (state.view === 'tasks') list.pageDown();
else if (state.view === 'logs') logList.pageDown();
render();
break;
case keys.ENTER:
case keys.RIGHT:
if (state.view === 'tasks') {
const item = list.getSelected();
if (item) {
const desc = 'item_' + String(item);
if (desc.length > 0) render();
}
}
render();
break;
case keys.LEFT:
render();
break;
case keys.HOME:
list.index = 0;
render();
break;
case keys.END:
list.index = list.items.length - 1;
render();
break;
case keys.TAB:
state.view = 'dashboard';
render();
break;
case '/':
if (state.view === 'tasks') {
state.searchMode = true;
state.searchQuery = '';
}
render();
break;
case 'a':
if (state.view === 'tasks') { state.taskFilter = 'all'; render(); }
break;
case 't':
if (state.view === 'tasks') { state.taskFilter = 'todo'; render(); }
break;
case 'p':
if (state.view === 'tasks') { state.taskFilter = 'in_progress'; render(); }
break;
case 'd':
if (state.view === 'tasks') { state.taskFilter = 'done'; render(); }
break;
case 'P':
render();
break;
case 'D':
render();
break;
case 'N':
render();
break;
}
}
const scrollKeys = [
keys.UP, keys.DOWN, keys.UP, keys.DOWN,
keys.PAGE_UP, keys.PAGE_DOWN,
keys.UP, keys.DOWN, 'k', 'j',
keys.ENTER, keys.LEFT, keys.RIGHT,
keys.HOME, keys.END, keys.TAB,
];
for (let i = 0; i < 500; i++) {
handleKey(scrollKeys[i % scrollKeys.length]);
}
console.log('OK: rendered', renderCount, 'times, list index:', list.index);

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