================
@@ -115,8 +148,23 @@ Status
NativeProcessSoftwareSingleStep::SetupSoftwareSingleStepping(
emulator_up->SetWriteMemCallback(&WriteMemoryCallback);
emulator_up->SetWriteRegCallback(&WriteRegisterCallback);
- if (!emulator_up->ReadInstruction())
- return Status("Read instruction failed!");
+ if (!emulator_up->ReadInstruction()) {
----------------
jasonmolenda wrote:
Ah wait, I see. This method is trying to decode where the next instruction
will go, with branches and jumps decoded, so we can put a breakpoint there.
And you're handling the case where we can't decode the current instruction (I
now understand why you used that in your test case). It seems harmless to call
GetLastInstrSize() if the instruction that couldn't be decoded, and add the
length of the instruction to pc. We can assume the emulation engine will
emulate all branching instructions. I could imagine the RISCV emulation plugin
didn't have decoding for an instruction that doesn't branch, it could fail, but
we can still decode the size of that unknown instruction successfully, and
assume that it does not branch.
https://github.com/llvm/llvm-project/pull/90075
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