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$ gdb -args out/node node/test/parallel/test-trace-events-dynamic-enable-workers-disabled.js 
(gdb) break api.cc:460
Breakpoint 1 at 0x26b7469: file ../v8/src/api.cc, line 460.
(gdb) r
Starting program: /usr/local/google/home/yangguo/gn-node/src/out/node node/test/parallel/test-trace-events-dynamic-enable-workers-disabled.js
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7f05d162b700 (LWP 76014)]
[New Thread 0x7f05d0e2a700 (LWP 76015)]
[New Thread 0x7f05cbfff700 (LWP 76016)]

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  function rgbToHsl(r, g, b) {
      r /= 255, g /= 255, b /= 255;
      var max = Math.max(r, g, b),
          min = Math.min(r, g, b);
      var h, s, l = (max + min) / 2;

      if (max == min) {
          h = s = 0; // achromatic
      } else {
          var d = max - min;

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[{"ts":3.0885000000707805,"k":"H"},{"ts":3.207700000028126,"k":"e"},{"ts":3.3682000000262633,"k":" "},{"ts":3.487900000065565,"k":"h"},{"ts":3.6079000000609085,"k":"a"},{"ts":3.7041000000899658,"k":"t"},{"ts":3.791800000006333,"k":"e"},{"ts":3.9520000000484288,"k":"d"},{"ts":4.063800000003539,"k":" "},{"ts":4.18370000005234,"k":"t"},{"ts":4.279600000008941,"k":"o"},{"ts":4.359700000029989,"k":" "},{"ts":4.488200000021607,"k":"b"},{"ts":4.5678000000771135,"k":"e"},{"ts":4.663700000033714,"k":" "},{"ts":4.847600000095554,"k":"s"},{"ts":4.912200000020675,"k":"e"},{"ts":5.0881000000517815,"k":"p"},{"ts":5.175800000084564,"k":"a"},{"ts":5.2557000000961125,"k":"r"},{"ts":5.423700000043027,"k":"t"},{"ts":5.495800000033341,"k":"e"},{"ts":6.576000000000931,"k":"a"},{"ts":6.783800000092015,"k":"r"},{"ts":7.34429999999702,"k":"t"},{"ts":7.409700000076555,"k":"e"},{"ts":7.575799999991432,"k":"d"},{"ts":7.663700000033714,"k":" "},{"ts":7.807700000004843,"k":"f"},{"ts":7.879700000048615,"k":"r"},{"ts":7.9196000000229105,"k

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[2018-02-19 15:22:01] yangguo@yangguo2:~/v8$ g out.gn/x64.debug/d8 --expose-gc --allow-natives-syntax
GNU gdb (GDB) 7.9-gg19
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-grtev4-linux-gnu".
Type "show configuration" for configuration details.

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diff --git a/BUILD.gn b/BUILD.gn
index 98e035fc6a..161e81a183 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -568,6 +568,10 @@ config("v8_gcov_coverage_ldflags") {
   ldflags = [ "-fprofile-arcs" ]
 }
 
+config("v8_dump") {
+  cflags = [ "-Og", "-g" ]