Bug 1440093 - Breakpoints at the end of a line are missed. r=jimb

devtools/server/actors/source.js

@@ -928,14 +928,20 @@ let SourceActor = ActorClassWithSpec(sourceSpec, {
         }
       }
 
-      // If we don't find any matching entrypoints, then
-      // we should check to see if the breakpoint is to the left of the first offset.
+      // If we don't find any matching entrypoints,
+      // then we should see if the breakpoint comes before or after the column offsets.
       if (entryPoints.length === 0) {
         for (let [script, columnToOffsetMap] of columnToOffsetMaps) {
           if (columnToOffsetMap.length > 0) {
-            let { columnNumber: column, offset } = columnToOffsetMap[0];
-            if (generatedColumn < column) {
-              entryPoints.push({ script, offsets: [offset] });
+            const firstColumnOffset = columnToOffsetMap[0];
+            const lastColumnOffset = columnToOffsetMap[columnToOffsetMap.length - 1];
+
+            if (generatedColumn < firstColumnOffset.columnNumber) {
+              entryPoints.push({ script, offsets: [firstColumnOffset.offset] });
+            }
+
+            if (generatedColumn > lastColumnOffset.columnNumber) {
+              entryPoints.push({ script, offsets: [lastColumnOffset.offset] });
             }
           }
         }

devtools/server/tests/unit/setBreakpoint-on-column-with-no-offsets-at-end-of-line.js

@@ -1,6 +0,0 @@
-"use strict";
-
-function f() {
-  var a = 1; var b = 2;
-  var c = 3;
-}

devtools/server/tests/unit/test_setBreakpoint-at-the-beginning-of-a-line.js

@@ -2,13 +2,10 @@
 
 var SOURCE_URL = getFileUrl("setBreakpoint-on-column.js");
 
-function run_test() {
-  return async function () {
+async function run_test() {
   do_test_pending();
-
   DebuggerServer.registerModule("xpcshell-test/testactors");
   DebuggerServer.init(() => true);
-
   let global = createTestGlobal("test");
   DebuggerServer.addTestGlobal(global);
 
@@ -58,7 +55,5 @@ function run_test() {
 
   await resume(threadClient);
   await close(client);
-
   do_test_finished();
-  };
 }

devtools/server/tests/unit/test_setBreakpoint-at-the-end-of-a-line.js

@@ -0,0 +1,62 @@
+"use strict";
+
+var SOURCE_URL = getFileUrl("setBreakpoint-on-column.js");
+
+async function run_test() {
+  do_test_pending();
+
+  DebuggerServer.registerModule("xpcshell-test/testactors");
+  DebuggerServer.init(() => true);
+
+  let global = createTestGlobal("test");
+  DebuggerServer.addTestGlobal(global);
+
+  let client = new DebuggerClient(DebuggerServer.connectPipe());
+  await connect(client);
+
+  let { tabs } = await listTabs(client);
+  let tab = findTab(tabs, "test");
+  let [, tabClient] = await attachTab(client, tab);
+  let [, threadClient] = await attachThread(tabClient);
+  await resume(threadClient);
+
+  let promise = waitForNewSource(threadClient, SOURCE_URL);
+  loadSubScript(SOURCE_URL, global);
+  let { source } = await promise;
+  let sourceClient = threadClient.source(source);
+
+  let location = { line: 4, column: 42 };
+  let [packet, breakpointClient] = await setBreakpoint(
+    sourceClient,
+    location
+  );
+
+  Assert.ok(!packet.isPending);
+  Assert.equal(false, "actualLocation" in packet);
+
+  packet = await executeOnNextTickAndWaitForPause(function () {
+    Cu.evalInSandbox("f()", global);
+  }, client);
+
+  Assert.equal(packet.type, "paused");
+  let why = packet.why;
+  Assert.equal(why.type, "breakpoint");
+  Assert.equal(why.actors.length, 1);
+  Assert.equal(why.actors[0], breakpointClient.actor);
+
+  let frame = packet.frame;
+  let where = frame.where;
+  Assert.equal(where.source.actor, source.actor);
+  Assert.equal(where.line, location.line);
+  Assert.equal(where.column, 28);
+
+  let variables = frame.environment.bindings.variables;
+  Assert.equal(variables.a.value, 1);
+  Assert.equal(variables.b.value, 2);
+  Assert.equal(variables.c.value.type, "undefined");
+
+  await resume(threadClient);
+  await close(client);
+
+  do_test_finished();
+}

devtools/server/tests/unit/test_setBreakpoint-on-column-with-no-offsets-at-end-of-line.js

@@ -1,39 +0,0 @@
-"use strict";
-
-var SOURCE_URL = getFileUrl("setBreakpoint-on-column-with-no-offsets-at-end-of-line.js");
-
-function run_test() {
-  return (async function () {
-    do_test_pending();
-
-    DebuggerServer.registerModule("xpcshell-test/testactors");
-    DebuggerServer.init(() => true);
-
-    let global = createTestGlobal("test");
-    DebuggerServer.addTestGlobal(global);
-
-    let client = new DebuggerClient(DebuggerServer.connectPipe());
-    await connect(client);
-
-    let { tabs } = await listTabs(client);
-    let tab = findTab(tabs, "test");
-    let [, tabClient] = await attachTab(client, tab);
-    let [, threadClient] = await attachThread(tabClient);
-    await resume(threadClient);
-
-    let promise = waitForNewSource(threadClient, SOURCE_URL);
-    loadSubScript(SOURCE_URL, global);
-    let { source } = await promise;
-    let sourceClient = threadClient.source(source);
-
-    let location = { line: 4, column: 23 };
-    let [packet, ] = await setBreakpoint(sourceClient, location);
-    Assert.ok(packet.isPending);
-    Assert.equal(false, "actualLocation" in packet);
-
-    Cu.evalInSandbox("f()", global);
-    await close(client);
-
-    do_test_finished();
-  })();
-}

devtools/server/tests/unit/xpcshell.ini

@@ -21,7 +21,6 @@ support-files =
   setBreakpoint-on-column.js
   setBreakpoint-on-column-in-gcd-script.js
   setBreakpoint-on-column-with-no-offsets.js
-  setBreakpoint-on-column-with-no-offsets-at-end-of-line.js
   setBreakpoint-on-column-with-no-offsets-in-gcd-script.js
   setBreakpoint-on-line.js
   setBreakpoint-on-line-in-gcd-script.js
@@ -223,9 +222,9 @@ reason = bug 937197
 [test_xpcshell_debugging.js]
 support-files = xpcshell_debugging_script.js
 [test_setBreakpoint-at-the-beginning-of-a-line.js]
+[test_setBreakpoint-at-the-end-of-a-line.js]
 [test_setBreakpoint-on-column.js]
 [test_setBreakpoint-on-column-in-gcd-script.js]
-[test_setBreakpoint-on-column-with-no-offsets-at-end-of-line.js]
 [test_setBreakpoint-on-line.js]
 [test_setBreakpoint-on-line-in-gcd-script.js]
 [test_setBreakpoint-on-line-with-multiple-offsets.js]