tracking iv&v analysis through multiple fsw builds

Tracking IV&V Analysis Through Multiple FSW Builds

Jacob T CoxJacob.t.cox@ivv.nasa.gov

Agenda

• An algorithm to remap lines in text file versions

• Several problems this may help solve– Flexelint efficiencies– Code assessment tracking

• Questions

Algorithm to Map Source Files in Consecutive Builds of Code

Using the Unix ‘diff‘ utility it is possible to map lines in text files from one version to another version of the same file.

• Shipped with version 5 of Unix in 1970• Uses the Hunt–McIlroy algorithm• Produces a format that ‘ed’ can use to

recreate the original from the current file version

Diff Utility Output20,21c20,2151d5054,59c53,5562,63c58,59556d551560a556562c558,569570,574c577,578577,579c581581c583,584589,592d591596,607d594682d668796,798d781814c797845c828

20,21c20,21< * \version $Revision: 180847 $< * \date $Date: 2011-07-15 15:10:34 -0700 (Fri, 15 Jul 2011) $---> * \version $Revision: 204123 $> * \date $Date: 2012-01-10 22:13:26 -0800 (Tue, 10 Jan 2012) $50a51> I32 j ;53,55c54,59< for (i=0 ; i<DMS_PDP_NUM_PENDING ; i++) {< if (dms_state->hinfo[i].cix == cix) {< break ;---> > for (i=0 ; i<DMS_PDP_NUM_RTYPE ; i++) {> for (j=0 ; j<DMS_PDP_NUM_PENDING ; j++) {> if (dms_state->hinfo[i][j].cix == cix) {> return &dms_state->hinfo[i][j] ;> }58,59c62,63< FSW_ASSERT_1(i < DMS_PDP_NUM_PENDING, cix) ;< return &dms_state->hinfo[i] ;---> FSW_ASSERT_1(FALSE, cix) ;> return NULL ;551a556> I32 rt ;556d560< phi = NULL ;

Diff Output Useful Diff Output

Explicit Changespluto:experiment> ../bin/codeFragment prev/dms/dms_pdp.c 48 65 48: 49: STATIC DmsPdpHandle * dms_pdp_get_handle(DmsCatIndex cix) { 50: I32 i ; 51: 52: FSW_ASSERT_1(cix < DMS_CAPACITY, cix) ; 53: for (i=0 ; i<DMS_PDP_NUM_PENDING ; i++) { 54: if (dms_state->hinfo[i].cix == cix) { 55: break ; 56: } 57: } 58: FSW_ASSERT_1(i < DMS_PDP_NUM_PENDING, cix) ; 59: return &dms_state->hinfo[i] ; 60: } 61: 62: DmsPdpInfo const * dms_pdp_get_info(DmsCatIndex cix) { 63: DmsPdpHandle const * phi ; 64: 65: phi = dms_pdp_get_handle(cix) ;

pluto:experiment> ../bin/codeFragment curr/dms/dms_pdp.c 48 65 48: 49: STATIC DmsPdpHandle * dms_pdp_get_handle(DmsCatIndex cix) { 50: I32 i ; 51: I32 j ; 52: 53: FSW_ASSERT_1(cix < DMS_CAPACITY, cix) ; 54: 55: for (i=0 ; i<DMS_PDP_NUM_RTYPE ; i++) { 56: for (j=0 ; j<DMS_PDP_NUM_PENDING ; j++) { 57: if (dms_state->hinfo[i][j].cix == cix) { 58: return &dms_state->hinfo[i][j] ; 59: } 60: } 61: } 62: FSW_ASSERT_1(FALSE, cix) ; 63: return NULL ; 64: } 65: 66: DmsPdpInfo const * dms_pdp_get_info(DmsCatIndex cix) { 67: DmsPdpHandle const * phi ; 68: 69: phi = dms_pdp_get_handle(cix) ;

Red text is changed text5

The Algorithm• Parse the diff file lines and store on a list

• convert Line Number( target line) {• for each parsed line in the diff file {• determine a trigger line in the current files to update line counts

• set skips based on whether the diff line is add, change or delete • if target occurs prior to next change, return calculated value• move to trigger line• if at target then return• perform skips• if past target then it is in a deleted section and does not map• }• The target is past the last diff line so calculate and return• }

Assumptions

• Lines do not move from file to file• Lines do not change relative order within a file• Internal changes do not make a previous false

positive a true positive• Noise from randomly matching lines will be

inconsequential

Aids in Solutions to

• Identify repeated Static Code Analysis warnings through consecutive builds

• Identifying fixed issues in a new build• Identify where changes in software source

have invalidated prior implementation verification analysis

• Identify source elements that have no reference in project documentation

Common component

Mapping lines of source code to their equivalent in successive builds of code.

• Given a line of code in a {new, previous} build, what line is it in the {previous, new} build.

File.c…202 int I;203204 if (I = j( a, b)) {…214 }

File.c…213 int I;214215 if (I = j( a, b)) {…225 }9.4.3

Some Possible Uses

Repeated Static Code Analysis Warnings

• Klocwork can show new warnings on consecutive builds

• Klocwork can show when an issue was fixed• It is difficult to show new warnings for

consecutive Flexelint builds

Finding if a Warning was in the Previous Build

Error 313

fexelint finds error 313 on line 215.

Finding if a Warning was in the Previous Build Ctd.

Error 313

Use the algorithm to see what the equivalent to line 215 was in the previous build

Finding if a Warning was in the Previous Build Ctd.

Error 313

fexelint has the same error on line 204 of the previous Build which is equivalent to line 215.

Error 313

Identifying a Fixed Warnings

File.c…213 float I;214215 if (I = j( a, b)) {…225 }9.4.3

The error on line 204 of the previous Build no longer exists. If an issue had been written it may be closed.

Error 313

Fexelint Warningscurr\dms\dms_pdp.c 274 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 289 Info 737 "Loss of sign in promotion from int to unsigned int"curr\dms\dms_pdp.c 289 Info 737 "Loss of sign in promotion from int to unsigned int"curr\dms\dms_pdp.c 289 Info 713 "Loss of precision (assignment) (unsigned int to int)"curr\dms\dms_pdp.c 297 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 305 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 346 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 360 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 375 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 377 Info 713 "Loss of precision (assignment) (unsigned int to int)"curr\dms\dms_pdp.c 377 Warning 613 "Possible use of null pointer 'p_dpo_id' in argument to operator 'unary *' …"curr\dms\dms_pdp.c 327 Info 831 "Reference cited in prior message"curr\dms\dms_pdp.c 378 Warning 613 "Possible use of null pointer 'p_dpo_length' in argument to operator 'unary *' …"curr\dms\dms_pdp.c 328 Info 831 "Reference cited in prior message"curr\dms\dms_pdp.c 379 Warning 613 "Possible use of null pointer 'p_dp_offset' in argument to operator 'unary …"curr\dms\dms_pdp.c 329 Info 831 "Reference cited in prior message"curr\dms\dms_pdp.c 406 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 417 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 417 Info 717 "do ... while(0);"curr\dms\dms_pdp.c 430 Warning 570 "Loss of sign (arg. no. 2) (int to unsigned int)"curr\dms\dms_pdp.c 430 Info 717 "do ... while(0);"

Fexelint Warnings

Flex FilterAlgorithm

Previous Warnings

Diff File

Current Warnings

New Warnings

Results

• A test on the DMS module for MSL version 9.4.2 and 9.4.3 gave 69 warnings from an initial 5,846.

• With 44,864 C lines of code• Warning with equivalent line numbers and the

same error code were removed. {I’m sure some folks can come up with improved heuristics but it seems to work well right now.}

New Topic:Assessment Tracking

Code Assessments in MSL

• The project had a schedule relating requirements to the build in which they were to be implemented

• The IV&V project verified that the requirements were implemented in the build

• This assessment including the location was captured in clear text

• The locations could not be kept current as new builds were delivered

Tracking Code Assessments

Assessment

Semantic assessment that a requirement is implemented on line 204.

Tracking Code Assessments Ctd.

Assessment

Use algorithm to find line 204 in the next build.

Tracking Code Assessments Ctd

Assessment

Assessment now maps to line 215 in the new build.

Identifying an Assessment has been Invalidated

File.c…213 int I;214215 if (I = k( a, b)) {…225 }9.4.3

Assessment

Changes in software invalidates the assessment.

Moving Assessments ForwardBuild 1

A new build is delivered

Moving Assessments Forward

Assessment

Build 1

Assessment

Assessments are made

Assessment

AssessmentAssessment

Assessment

Build 1Build 2

27A new build arrives

Assessment

Build 1Build 2

28Use algorithm to bring assessments forward

Assessment

Assessment Assessment

Assessment

Build 1Build 2

29Make more assessments

Assessment

Build 1Build 2

Build 3

Assessment

Assessment Assessment

Assessment

Build 1Build 2

Build 3

Assessment

Build 1Build 2

Build 3

Identifying Un-Assessed Software

Final BuildAssessment

Assessment

Un-assessed Software

To Make This Work

• A standard way to store assessments• A way to associate assessments with source

code• A process to move the assessments forward

Finale

• The ability to remap assessments or warnings to consecutive builds could be useful.

Questions?

tracking iv&v analysis through multiple fsw builds

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