how to run v8 in debug mode so I can use the %DebugPrint

杨亮

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Aug 15, 2019, 9:26:08 AM8/15/19

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hi，I want to know how I can run d8 in debug mode so I can use %DebugPrint command，I can just get one line output info，seems I need run d8 in the debug mode ？

Rodolph Perfetta

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Aug 15, 2019, 10:38:07 AM8/15/19

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To be able to use native functions starting with % such as %DebugPrint you need to pass --allow-natives-syntax to d8 on the command line.

Cheers,

Rodolph

On Thu, 15 Aug 2019 at 09:26, 杨亮 <yanglian...@bytedance.com> wrote:

hi，I want to know how I can run d8 in debug mode so I can use %DebugPrint command，I can just get one line output info，seems I need run d8 in the debug mode ？

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杨亮

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Aug 15, 2019, 10:38:04 PM8/15/19

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Thanks man. In fact I have use the --allow-natives-syntax, but I can't get enough information about a function, someone say that I need run d8 In the debug mode, but I don't know how.

On Thursday, August 15, 2019 at 10:38:07 PM UTC+8, Rodolph Perfetta wrote:

To be able to use native functions starting with % such as %DebugPrint you need to pass --allow-natives-syntax to d8 on the command line.

Cheers,
Rodolph

On Thu, 15 Aug 2019 at 09:26, 杨亮 <yanglia...@bytedance.com> wrote:

hi，I want to know how I can run d8 in debug mode so I can use %DebugPrint command，I can just get one line output info，seems I need run d8 in the debug mode ？

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Rodolph Perfetta

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Aug 16, 2019, 1:15:14 AM8/16/19

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They probably meant you need to build d8 in debug mode. more info here: https://v8.dev/docs/build

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杨亮

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Aug 16, 2019, 2:14:06 AM8/16/19

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The doc says to build v8 with tools/dev/gm.py x64.release, so is that mean I should build the debug mode d8 with tools/dev/gm.py x64.debug ? Im not very shall how to build the v8 in debug mode. Very thanks man!

On Friday, August 16, 2019 at 1:15:14 PM UTC+8, Rodolph Perfetta wrote:

They probably meant you need to build d8 in debug mode. more info here: https://v8.dev/docs/build

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/5c6a92d3-3d7c-4101-84b3-387de584058f%40googlegroups.com.

Simon Zünd

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Aug 16, 2019, 2:20:56 AM8/16/19

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Yes, building V8 with {tools/dev/gm.py x64.debug} will configure a debug build of V8. Please note that gm.py is just a convenience wrapper. The source of truth for a build configuration can always be found in the {args.gn} file of the respective build. In your case this should be {out/x64.debug/args.gn}, which will contain a line {is_debug = true}.

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