Bug 46713 – JSC compile fails on 32bit platform when Regexp Tracing is enabled

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Peter Varga]

In case of REGEXP_TRACING define is enabled I got the following error during the compile on 32bit platform since -Werror flag is added:

cc1plus: warnings being treated as errors
../../../JavaScriptCore/runtime/RegExp.cpp: In member function 'void JSC::RegExp::printTraceData()':
../../../JavaScriptCore/runtime/RegExp.cpp:257: error: format '%014lx' expects type 'long unsigned int', but argument 3 has type 'uintptr_t'

[Peter Varga]

Created attachment 69036 [details]
proposed patch

[Michael Saboff]

Thanks for looking into this.

I have some concerns with %p is that it doesn't include leading zeros and pretty much ignores precision.  Did you consider changing the cast to (unsigned long)?

[Csaba Osztrogonác]

Comment on attachment 69036 [details]
proposed patch

View in context: https://bugs.webkit.org/attachment.cgi?id=69036&action=review

%lx expects "unsigned long int", but uintptr_t is
"unsigned long int" on 64 bit and "unsigned int" on 32 bit

sizeof(uintptr_t) == sizeof(unsigned long int) always,
but unfortunately unsigned int != unsigned long int. :(

I propose to cast unsigned long int with reinterpret_cast and use %014lx.
I prefer reinterpret_cast instead of obsolete C style cast



On 64 bit machine:
-------------------
sizeof(int) = 4
sizeof(long int) = 8
sizeof(long long int) = 8
sizeof(uintptr_t) = 8

sizeof(uintptr_t) == sizeof(unsigned long int) == 8
typedef unsigned long int uintptr_t;

On 32 bit machine:
-------------------
sizeof(int) = 4
sizeof(long int) = 4
sizeof(long long int) = 8
sizeof(uintptr_t) = 4

sizeof(uintptr_t) == sizeof(unsigned long int) == 4
typedef unsigned int uintptr_t;

> JavaScriptCore/runtime/RegExp.cpp:257
> -            sprintf(jitAddr, "0x%014lx", (uintptr_t)codeBlock.getAddr());
> +            sprintf(jitAddr, "%16p", codeBlock.getAddr());

sprintf(jitAddr, "0x%014lx", reinterpret_cast<unsigned long int>(codeBlock.getAddr()));

[Peter Varga]

Created attachment 69180 [details]
proposed patch v2

[WebKit Commit Bot]

Comment on attachment 69180 [details]
proposed patch v2

Clearing flags on attachment: 69180

Committed r68639: <http://trac.webkit.org/changeset/68639>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.