embedding testing 2015
TRANSCRIPT
In a world of bugs – How to become a successful
bug-hunter?
by Georg Lohrer
from EmbeddedSuccess.com
The Trains
The Trains
License: CC0 Public Domain
Training on the job
1st Carriage of the „People“-Train
Use your internal resources
Use a skill-matrix!
Compose Your Own Who‘s Who
2nd Carriage of the „People“-Train
Non-Destructive vs. Destructive
Analyze the logfiles
Search the history
Drill and strip off
Blablablabla blabla
…
#if 0
blabla {
bla = blabla();
blablabla(bla);
bla(bla; bla; bla) {
…
}
if (bla > bla) {
blabla;
} then {
bla;
}
}
bla (bla ? bla : bla);
#endif
bla(bla);
}
Blablablabla blabla
…
blabla {
bla = blabla();
#if 0
blablabla(bla);
bla(bla; bla; bla) {
…
}
#endif
if (bla > bla) {
blabla;
} then {
bla;
}
}
bla (bla ? bla : bla);
}
Blablablabla blabla
…
blabla {
bla = blabla();
blablabla(bla);
bla(bla; bla; bla) {
…
}
if (bla > bla) {
blabla;
} then {
bla;
}
}
bla (bla ? bla : bla);
}
Instrument your code
int foo(double& y) {
int x = 0;
x = enumerate(y);
return x;
}
int foo(double& y) {
int x = 0;
ENSURE(y >= 0.0);
x = enumerate(y);
ASSURE(x > 10);
return x;
}
int foo(double& y) {
CHECKPARAM1(y);
STARTMEMCHECK();
int x = 0;
ENSURE(y >= 0.0);
x = dofoo(y);
ASSURE(x > 10);
ENDMEMCHECK();
return x;
}
3rd Carriage of the „People“-Train
Collect facts
Collect Suspects
Do NOT trust witnesses!
Stay Patient
Sherlock Holmes
© HitToon.com / Fotolia
Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. Arthur Conan Doyle
4th Carriage of the „People“-Train
Thinking out-of-the-box
Think the Impossible
Change …
Change Your Perspective
Good Cop – Bad Cop or
The Devil‘s Advocat
5th Carriage of the „People“-Train
„Tell Your Dog“-Principle
横 展開 Yoko Ten Kai
横 beside, lateral, horizontal 展開 deployment, development,
advance
Yoko Ten Kai
The Trains
Bug Hunting
… is a learnable skill
Finally
Bug Hunting
… is a learnable skill
Sometimes
You need a pinch of intuition and luck.
Keep in Mind
Stay Curious
Keep in Mind
Stay Curious Never Give Up
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