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-rw-r--r--js/src/jit-test/tests/debug/Frame-onStep-15.js43
1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onStep-15.js b/js/src/jit-test/tests/debug/Frame-onStep-15.js
new file mode 100644
index 000000000..539ff5f05
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onStep-15.js
@@ -0,0 +1,43 @@
+// Test how stepping interacts with for(;;) statements.
+
+let g = newGlobal();
+
+// We want a for(;;) loop whose body is evaluated at least once, to
+// see whether the loop head is hit a second time.
+g.eval(`function f() {
+ let x = 0;
+ debugger; // +0
+ for(;;) { // +1
+ if (x++ == 1) break; // +2
+ } // +3
+ debugger; // +4
+}`);
+
+let dbg = Debugger(g);
+
+function test(s, expected) {
+ let result = '';
+
+ dbg.onDebuggerStatement = function(frame) {
+ // On the second debugger statement, we're done.
+ dbg.onDebuggerStatement = function(frame) {
+ frame.onStep = undefined;
+ };
+
+ let debugLine = frame.script.getOffsetLocation(frame.offset).lineNumber;
+ frame.onStep = function() {
+ // Only examine stops at entry points for the line.
+ let lineNo = this.script.getOffsetLocation(this.offset).lineNumber;
+ if (this.script.getLineOffsets(lineNo).indexOf(this.offset) < 0) {
+ return undefined;
+ }
+
+ let delta = this.script.getOffsetLocation(this.offset).lineNumber - debugLine;
+ result += delta;
+ };
+ };
+ g.eval(s);
+ assertEq(result, expected);
+}
+
+test('f()', '2124');