BarrSlides_FINAL_SCRUBBED.pdf?utm_content=bufferb9206&utm_medium=social&utm_source=twitter

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TYPES OF SPAGHETTI CODEData-flow spaghetti! Complex coupling between software modules and between tasks! Count of global variables is a software metric for “tangledness”2005 Camry L4 has >11,000 global variables (NASA)Control-flow spaghetti! Many long, overly-complex function bodies! Cyclomatic Complexity is a software metric for “testability”2005 Camry L4 has 67 functions scoring >50 (“untestable”)The throttle angle function scored over 100 (unmaintainable)24Barr Chapter RegardingToyota’s Code Complexity
STACK ANALYSIS FOR 2005 CAMRY L4OSEK Data+ Recursion4,096 bytes94% (vs. the 41% Toyota told NASA!)Recursion violates a MISRA-C rule(1998: #70; 2004: #16.2)1,024 bytes25Barr Chapter RegardingToyota’s Stack Analysis
Page 3 and 4: BOOKS BY MICHAEL BARR1ed: 1999; 2ed
Page 5 and 6: MY REVIEW OF TOYOTA’S SOURCE CODE
Page 7 and 8: ELECTRONIC THROTTLE CONTROLfdadg7
Page 9 and 10: SAFETY-CRITICAL SYSTEMSNot all embe
Page 11 and 12: SUMMARY OF 2005 CAMRY L4 CONCLUSION
Page 13 and 14: NASA DID NOT RULE OUT UA BY SOFTWAR
Page 15 and 16: 15ETCS SOFTWARE MALFUNCTION
Page 17 and 18: TOYOTA’S OPERATING SYSTEM (OSEK)1
Page 19 and 20: MEMORY CORRUPTION AND TASK DEATH0Bi
Page 21 and 22: SOFTWARE CAUSES OF MEMORY CORRUPTIO
Page 23: TOYOTA’S SPAGHETTI CODETOY-MDL049
Page 27 and 28: TOYOTA’S MAJOR STACK MISTAKESToyo
Page 29 and 30: TOYOTA FAILED TO COMPLY WITH STANDA
Page 31 and 32: TOYOTA FAILED TO COMPLY WITH STANDA
Page 33 and 34: NASA’S SOFTWARE AREAS OF CONCERNN
Page 35 and 36: LAYER 1: MIRRORING OF CRITICAL VARI
Page 37 and 38: UA VIA MEMORY CORRUPTIONTask X deat
Page 39 and 40: LAYER 2: DTCs AND FAIL-SAFE MODESNA
Page 41 and 42: TOYOTA’S DEFECTIVE WATCHDOG DESIG
Page 43 and 44: TOYOTA FAILED TO REVIEW MONITOR CPU
Page 45 and 46: MONITOR CPU IS LAST LINE OF UA DEFE
Page 47 and 48: TOYOTA’S INADEQUATE SOFTWARE PROC
Page 49 and 50: NASA SOUGHT WHAT BARR GROUP FOUND
Page 51 and 52: INDIVIDUAL TASK DEATH OUTCOMES(Watc
Page 53 and 54: UA FOREVER IF BRAKE ON AT TASK DEAT
Page 55 and 56: OTHER SIMILAR INCIDENT CRITERIAVehi
Page 57: TOYOTA’S EXPERT HAS NOT REBUTTEDM

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