I'd google for "gdb set break point at address" :) On Wed, Feb 17, 2016, 09:42 <[email protected]> wrote:
> Thank Jochen, but I don't clearly understand how to set breakpoint on JS > function? I can set breakpoints only on c++ functions in gdb. > > On Wednesday, February 17, 2016 at 2:07:04 PM UTC+6, Jochen Eisinger wrote: > >> V8 will move code objects around during garbage collection. If you want >> to debug code in code objects, you'll have an easier time if you disable >> this by passing --nocompact_code_space. >> >> Otherwise, using the regular commands to set breakpoints in gdb should >> work just fine. >> >> On Wed, Feb 17, 2016 at 8:55 AM <[email protected]> wrote: >> > Hi v8 community! >>> >>> I have a js function: >>> >>> function foo(o) { >>> return o.x; >>> } >>> >>> >>> print(foo(37)); >>> >>> >>> I can see asm code for this function via "--print-code" flag, >>> but I want to set a breakpoint at this function and see asm code in my >>> gdb. >>> >>> For example: >>> >>> If I see this code in logs: >>> 0x1ec9f1e3eeb8 24 488bd0 REX.W movq rdx,rax >>> 0x1ec9f1e3eebb 27 48b959bb34fb37140000 REX.W movq rcx,0x1437fb34bb59 >>> ;; debug: position 27 >>> ;; object: >>> 0x1437fb34bb59 <String[1]: x> >>> 0x1ec9f1e3eec5 37 48b80000000001000000 REX.W movq rax,0x100000000 >>> 0x1ec9f1e3eecf 47 e8cc92fdff call 0x1ec9f1e181a0 ;; code: >>> contextual, LOAD_IC, GENERIC >>> ] >>> [ Return sequence >>> 0x1ec9f1e3eed4 52 48bb91d03dfb37140000 REX.W movq rbx,0x1437fb3dd091 >>> ;; object: 0x1437fb3dd091 Cell for 6144 >>> >>> In runtime I want to jump into 0x1ec9f1e181a0 and see what is happening >>> there. >>> >>> How can I do this? >>> >>> -- >>> -- >>> v8-dev mailing list >>> >> [email protected] >> >> >>> http://groups.google.com/group/v8-dev >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "v8-dev" group. >>> >> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >> >> >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- > -- > v8-dev mailing list > [email protected] > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
