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add support for CFA in the eval system

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Canonical Frame Address is a DWARF-only concept encoded in the unwind info.
Debugger must store this data for each call frame and provide it to
the eval system based on selected stack frame.

To abstract over format details, we introduce a "Frame Unwind Context".
For DWARF, this context maintains the intermediate unwind state and exposes
the CFA, whereas for PE, it remains empty.
This commit is contained in:
Nikita Smith
2025-11-26 15:42:40 -08:00
parent 2a6d0d737c
commit f9561cb618
9 changed files with 225 additions and 100 deletions
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src/dbg_engine/dbg_engine_core.c
+14
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@@ -1138,6 +1138,20 @@ d_query_cached_rip_from_thread_unwind(CTRL_Entity *thread, U64 unwind_count)
return result;
}
internal U64
d_query_cached_cfa_from_thread_unwind(CTRL_Entity *thread, U64 unwind_count)
{
U64 cfa = 0;
Access *access = access_open();
CTRL_CallStack callstack = ctrl_call_stack_from_thread(access, thread->handle, 1, 0);
if(callstack.concrete_frames_count != 0)
{
cfa = callstack.concrete_frames[unwind_count%callstack.concrete_frames_count]->cfa;
}
access_close(access);
return cfa;
}
internal U64
d_query_cached_tls_base_vaddr_from_process_root_rip(CTRL_Entity *process, U64 root_vaddr, U64 rip_vaddr)
{