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import-trace: emit warning for malformed traces

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The Fail* tools expect trace events to be ordered in a specific way:
memory-access events are supposed to come *after* the instruction
event for the instruction that caused them.  Using a different order
may cause subtle problems with both fault-space pruning and fast
forwarding.  This change introduces a warning message when such a
malformed trace is detected (i.e., when the instruction pointer of a
memory-access event does not match the preceding instruction event).

Change-Id: I8ae7420fd8ff26e2574590748bdcc5a63db76490
This commit is contained in:
Horst Schirmeier
2013-12-20 11:26:21 +01:00
parent 5ac108ea4b
commit 84edd02b6f
1 changed files with 9 additions and 0 deletions
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9
tools/import-trace/Importer.cc
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@ -68,6 +68,8 @@ bool Importer::copy_to_database(fail::ProtoIStream &ps) {
instruction_count_t instr = 0; instruction_count_t instr = 0;
// instruction counter new memory access events belong to // instruction counter new memory access events belong to
instruction_count_t instr_memaccess = 0; instruction_count_t instr_memaccess = 0;
// absolute instruction address of the latest IP event
guest_address_t instr_memaccess_absolute = 0;
// the currently processed event // the currently processed event
Trace_Event ev; Trace_Event ev;
@ -104,8 +106,15 @@ bool Importer::copy_to_database(fail::ProtoIStream &ps) {
// all subsequent mem access events belong to this dynamic instr // all subsequent mem access events belong to this dynamic instr
instr_memaccess = instr; instr_memaccess = instr;
instr_memaccess_absolute = ev.ip();
instr++; instr++;
} else { } else {
if (ev.ip() != instr_memaccess_absolute) {
LOG << "warning: mem-access IP 0x" << std::hex << ev.ip()
<< " differs from previous instruction IP 0x" << instr_memaccess_absolute
<< " at instr=" << std::dec << instr_memaccess
<< " (mem accesses must follow *after* their corresponding IP events in the trace!)" << std::endl;
}
if (!handle_mem_event(curtime, instr_memaccess, ev)) { if (!handle_mem_event(curtime, instr_memaccess, ev)) {
LOG << "error: handle_mem_event() failed at instr=" << instr_memaccess << std::endl; LOG << "error: handle_mem_event() failed at instr=" << instr_memaccess << std::endl;
return false; return false;