v8/test/debugger/debug/debug-conditional-breakpoints.js

// Copyright 2008 the V8 project authors. All rights reserved.
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Debug = debug.Debug

// Simple debug event handler which just counts the number of break points hit.
var break_point_hit_count;

function listener(event, exec_state, event_data, data) {
  if (event == Debug.DebugEvent.Break) {
    break_point_hit_count++;
  }
};

// Add the debug event listener.
Debug.setListener(listener);

// Test functions.
count = 0;
function f() {};
function g() {h(count++)};
function h(x) {var a=x; return a};


// Conditional breakpoint which syntax error.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(f, 0, 0, '{{{');
f();
assertEquals(0, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which evaluates to false.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(f, 0, 0, 'false');
f();
assertEquals(0, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which evaluates to true.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(f, 0, 0, 'true');
f();
assertEquals(1, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which different types of quotes.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(f, 0, 0, '"a" == "a"');
f();
assertEquals(1, break_point_hit_count);
Debug.clearBreakPoint(bp);
break_point_hit_count = 0;
bp = Debug.setBreakPoint(f, 0, 0, "'a' == 'a'");
f();
assertEquals(1, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which checks global variable.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(f, 0, 0, 'x==1');
f();
assertEquals(0, break_point_hit_count);
x=1;
f();
assertEquals(1, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which checks global variable.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(g, 0, 0, 'count % 2 == 0');
for (var i = 0; i < 10; i++) {
  g();
}
assertEquals(5, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which checks a parameter.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(h, 0, 0, 'x % 2 == 0');
for (var i = 0; i < 10; i++) {
  g();
}
assertEquals(5, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Conditional breakpoint which checks a local variable.
break_point_hit_count = 0;
bp = Debug.setBreakPoint(h, 0, 22, 'a % 2 == 0');
for (var i = 0; i < 10; i++) {
  g();
}
assertEquals(5, break_point_hit_count);
Debug.clearBreakPoint(bp);

// Multiple conditional breakpoint which the same condition.
break_point_hit_count = 0;
bp1 = Debug.setBreakPoint(h, 0, 22, 'a % 2 == 0');
assertThrows(() => Debug.setBreakPoint(h, 0, 22, 'a % 2 == 0'));
for (var i = 0; i < 10; i++) {
  g();
}
assertEquals(5, break_point_hit_count);
Debug.clearBreakPoint(bp1);

// Multiple conditional breakpoint which different conditions.
break_point_hit_count = 0;
bp1 = Debug.setBreakPoint(h, 0, 22, 'a % 2 == 0');
assertThrows(() => Debug.setBreakPoint(h, 0, 22, '(a + 1) % 2 == 0'));
for (var i = 0; i < 10; i++) {
  g();
}
assertEquals(5, break_point_hit_count);
Debug.clearBreakPoint(bp1);