[inspector] avoid cloning of async call chains

test/inspector/debugger/collect-old-async-call-chains-expected.txt

Index: test/inspector/debugger/collect-old-async-call-chains-expected.txt
diff --git a/test/inspector/debugger/collect-old-async-call-chains-expected.txt b/test/inspector/debugger/collect-old-async-call-chains-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..395504de787be5bf0527d6956884c135fa75c71b
--- /dev/null
+++ b/test/inspector/debugger/collect-old-async-call-chains-expected.txt
@@ -0,0 +1,211 @@
+Checks that we drop old async call chains.
+
+Running test: testInfrastructure
+setMaxAsyncTaskStacks(1024)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(1024)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(1024)
+Run expression 'console.trace(42)' with async chain len: 5
+actual async chain len: 5
+
+setMaxAsyncTaskStacks(1024)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(1024)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(1024)
+Run expression 'console.trace(42)' with async chain len: 5
+actual async chain len: 5
+
+
+Running test: testZeroLimit
+setMaxAsyncTaskStacks(0)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(0)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(0)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(0)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 0
+
+
+Running test: testOneLimit
+setMaxAsyncTaskStacks(1)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(1)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(1)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(1)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 1
+
+
+Running test: testTwoLimit
+setMaxAsyncTaskStacks(2)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(2)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(2)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 0

[dgozman, 2017/04/17 23:03:16]

Why zero everywhere?

[kozy, 2017/04/18 01:04:39]

When we collect old stacks we removed all except current one, current one has
two stacks: creation and parent.

+
+setMaxAsyncTaskStacks(2)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(2)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(2)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 1
+
+
+Running test: testMoreThanTwoLimit
+setMaxAsyncTaskStacks(3)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(3)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(3)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(3)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(3)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(3)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 3
+
+setMaxAsyncTaskStacks(4)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(4)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(4)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 0
+
+setMaxAsyncTaskStacks(4)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(4)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(4)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 3
+
+setMaxAsyncTaskStacks(5)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(5)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(5)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(5)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(5)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(5)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 3
+
+setMaxAsyncTaskStacks(6)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(6)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(6)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(6)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(6)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(6)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 3
+
+setMaxAsyncTaskStacks(7)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(7)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(7)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 3
+
+setMaxAsyncTaskStacks(7)
+Run expression 'console.trace(42)' with async chain len: 1
+actual async chain len: 1
+
+setMaxAsyncTaskStacks(7)
+Run expression 'console.trace(42)' with async chain len: 2
+actual async chain len: 2
+
+setMaxAsyncTaskStacks(7)
+Run expression 'console.trace(42)' with async chain len: 3
+actual async chain len: 3
+