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Incorrect handling of types causes a segfault on arm #1424

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merged 1 commit into from
May 31, 2017
Merged

Incorrect handling of types causes a segfault on arm #1424

merged 1 commit into from
May 31, 2017

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wbkang
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@wbkang wbkang commented May 30, 2017

On armv7l, char type is actually unsigned. So doing a switch on an unsigned value kindIndex with a negative case value actually does not work. My suggestion is to fix the type of kindIndex specifically to signed char. All unit tests pass if I make that change as well.

make units is passed.

Created an issue: #1423

I am contributing the code under the terms of the General Public License version 2 or any later version.

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Coverage remained the same at 85.416% when pulling 51ebf7d on wbkang:bugfix/unsignedswitch into 4b9aa92 on universal-ctags:master.

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On armv7l, char type is actually unsigned.
I was very suprised at this but you are right; I found the explanation in the K&R book in my hand.

valgrind is avaiable in your environment?

I would like you to run "make units VG=1". I hope valgrind reports something unwanted cses.

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I am contributing the code under the terms of the General Public License version 2 or any later version.

Thank you very much.

masatake
masatake approved these changes May 30, 2017
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main/parse.h Outdated
@@ -148,7 +148,7 @@ extern bool doesLanguageAllowNullTag (const langType language);
extern bool doesLanguageRequestAutomaticFQTag (const langType language);
extern const char *getLanguageName (const langType language);
extern kindDefinition* getLanguageKindForLetter (const langType language, char kindLetter);
extern kindDefinition* getLanguageKind(const langType language, char kindIndex);
extern kindDefinition* getLanguageKind(const langType language, signed char kindIndex);
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Can I ask you to add comments explaining why "signed" is added here?

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This is done!

@wbkang
Incorrect handling of types causes a segfault on
4c423b7 
armv7l (e.g., Raspberry Pi)

universal-ctags#1423

make units is passed.
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wbkang commented May 31, 2017

All test passed with valgrind on as well (it says #valgrind-error: 0). For the future reference, you have to comment out libarmmem.so in /etc/ld.so.preload (See: https://stackoverflow.com/a/42074785/2710) or else most valgrind tests will fail with error 139.

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Coverage remained the same at 85.416% when pulling 4c423b7 on wbkang:bugfix/unsignedswitch into 4146b4e on universal-ctags:master.

@masatake masatake merged commit 2064b8a into universal-ctags:master May 31, 2017
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Thank you.

@masatake masatake mentioned this pull request May 31, 2017
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