[cfe-dev] overwrite rewritten text

Kihong Heo via cfe-dev cfe-dev at lists.llvm.org
Mon Dec 10 10:04:27 PST 2018

My intention is to transform the input source code. But this transformation is not pre-defined but dynamic. I first apply some transformation (here, adding some statement); check its correctness with an off-the-shelf checker; it is wrong then I want to roll back. Is there any systematic way to do that?


> On Dec 10, 2018, at 12:56 PM, Jonas Toth <development at jonas-toth.eu> wrote:
> I am a bit puzzled of what you want to achieve.
> AFAIK the change must be applied to the file and then the AST must be
> recreated to get the new Source Locations, but if you `InsertText`
> something and then `RemoveText` at the same location and same length
> what do you intent to do?
> For me this sounds like just replace a piece of original code with new
> code. Otherwise that would be a no-op, not?
> Best Jonas
> Am 10.12.18 um 18:53 schrieb Kihong Heo:
>> Hi,
>> Thanks for your suggestion.
>> But the result is the same.
>> I noticed that It works as if the new string was not inserted.
>> For example, “Loc” points to the location after the inserted string, and “Loc.getWithOffset(-1)” points to the location before the string.
>> Is there any solution to sync up the mismatch?
>> Thanks,
>> Kihong
>>> On Dec 10, 2018, at 11:38 AM, Jonas Toth <development at jonas-toth.eu> wrote:
>>> Hi,
>>> did you consider creating a Replacement instead of a Insert-Remove
>>> combination?
>>> Best, Jonas
>>> Am 10.12.18 um 06:04 schrieb Kihong Heo via cfe-dev:
>>>> Hi All,
>>>> How can I overwrite or remove some code parts which were already rewritten?
>>>> Here is my code:
>>>> string S = …
>>>> Rewriter.InsertText(Loc, S);
>>>> Rewriter.RemoveText(Loc, S.length());    <=== Here, Segmentation fault.
>>>> Thanks for your help!
>>>> Best,
>>>> Kihong
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