llvm-project

fe8cf2fc - [clang][ASTMatchers] Fix forEachArgumentWithParam* for deducing "this" operator calls (#84887)

[clang][ASTMatchers] Fix forEachArgumentWithParam* for deducing "this" operator calls (#84887) This is a follow-up commit of #84446. In this patch, I demonstrate that `forEachArgumentWithParam` and `forEachArgumentWithParamType` did not correctly handle the presence of the explicit object parameter for operator calls. Prior to this patch, the matcher would skip the first (and only) argument of the operator call if the explicit object param was used. Note that I had to move the definition of `isExplicitObjectMemberFunction`, to be declared before the matcher I fix to be visible. I also had to do some gymnastics for passing the language standard version command-line flags to the invocation as `matchAndVerifyResultTrue` wasn't really considered for non-c++11 code. See the that it always prepends `-std=gnu++11` to the command-line arguments. I workarounded it by accepting extra args, which get appended, thus possibly overriding the hardcoded arguments. I'm not sure if this qualifies for backporting to clang-18 (probably not because its not a crash, but a semantic problem), but I figure it might be useful for some vendors (like us). But we are also happy to cherry-pick this fix to downstream. Let me know if you want this to be backported or not. CPP-5074