[cfe-dev] Combining floatLiteral() Node Matcher with isExpansionInFileMatching() Narrowing Matcher provides unexpected results

Stephen Kelly via cfe-dev cfe-dev at lists.llvm.org
Wed Jan 9 15:01:01 PST 2019


On 09/01/2019 14:15, FarSight Studios via cfe-dev wrote:
> Hi,
> 
> Combining floatLiteral() Node Matcher with isExpansionInFileMatching() 
> Narrowing Matcher provides unexpected results.
> The following matcher: 
> floatLiteral(isExpansionInFileMatching("include/math.h"))
> does not matches "M_E" which is defined in "math.h"
> 
> #include <math.h>
> 
> int consts(int n){
>      double varX = M_E;
>      return varX;
> }
> 
> It matches a single unrelated node:
> FloatingLiteral 0x562c409bdaa8 </usr/include/math.h:1184:47> 'float' 
> 0.000000e+00
> 
> Am I doing something wrong?


M_E is a macro and that macro is expanded in your

  double varX = M_E;

line. The expansion is not in math.h. The expansion is in the main file.

  http://ec2-18-191-7-3.us-east-2.compute.amazonaws.com:10240/z/qRMj-W

By the way, we have a llvm channel on the cpplang slack 
(https://cpplang.slack.com). That is a more suitable venue for your 
questions. This is the development mailing list.

Thanks,

Stephen.



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