Hello!
I am investigating postmortem debugging of V8 using the dumps collected by
Crashpad on Windows. Stepping through
crashpad::internal::ModuleSnapshotWin::GetCrashpadExtraMemoryRanges for the
binary that links in v8 code doesn't yield any additional memory ranges:
1:141> dx -id 0,1 -r1
(*((crashpad::process_types::CrashpadInfo<crashpad::process_types::internal::Traits64>
*)0x69085ff000))
(*((crashpad::process_types::CrashpadInfo<crashpad::process_types::internal::Traits64>
*)0x69085ff000)) [Type:
crashpad::process_types::CrashpadInfo<crashpad::process_types::internal::Traits64>]
[+0x000] signature : 0x43506164 [Type: unsigned int]
[+0x004] size : 0x38 [Type: unsigned int]
[+0x008] version : 0x1 [Type: unsigned int]
[+0x00c] indirectly_referenced_memory_cap : 0x0 [Type: unsigned int]
[+0x010] padding_0 : 0x0 [Type: unsigned int]
[+0x014] crashpad_handler_behavior : 0x0 [Type: unsigned char]
[+0x015] system_crash_reporter_forwarding : 0x0 [Type: unsigned char]
[+0x016] gather_indirectly_referenced_memory : 0x0 [Type: unsigned char]
[+0x017] padding_1 : 0x0 [Type: unsigned char]
[+0x018] extra_address_ranges : 0x0 [Type: unsigned __int64]
[+0x020] simple_annotations : 0x0 [Type: unsigned __int64]
[+0x028] user_data_minidump_stream_head : 0x0 [Type: unsigned __int64]
[+0x030] annotations_list : 0x1a3f7238750 [Type: unsigned __int64]
I've found Isolate::GetCodeRange but it seems to be used only for setting
up the exception record (v8_crashpad_support::SetUp,
then crash_reporter::internal::RegisterNonABICompliantCodeRangeImpl).
Is there an established mechanism to report "interesting" memory ranges
from V8 to Crashpad? We'd like to collect the parts of the system heap that
contain Isolate and Heap objects, and the parts of the managed heaps that
are pertinent to the callstack of the crash.
Thank you!
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