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Improve the attribute language option interface somewhat; NFCi.

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The name field is optional if the custom code is supplied, so this updates the
documentation for LangOpt and introduces a tablegen warning if both custom code
and a language option name are supplied.
This commit is contained in:
Aaron Ballman 2020-03-14 15:57:28 -04:00
parent b8b8f04c0d
commit eda58ac04c
2 changed files with 9 additions and 3 deletions
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7
clang/include/clang/Basic/Attr.td
View File

@ -312,6 +312,7 @@ class SubjectList<list<AttrSubject> subjects, SubjectDiag diag = WarnDiag,
}
class LangOpt<string name, code customCode = [{}]> {
// The language option to test; ignored when custom code is supplied.
string Name = name;
// A custom predicate, written as an expression evaluated in a context with
@ -323,15 +324,15 @@ def Borland : LangOpt<"Borland">;
def CUDA : LangOpt<"CUDA">;
def HIP : LangOpt<"HIP">;
def SYCL : LangOpt<"SYCLIsDevice">;
def COnly : LangOpt<"COnly", "!LangOpts.CPlusPlus">;
def COnly : LangOpt<"", "!LangOpts.CPlusPlus">;
def CPlusPlus : LangOpt<"CPlusPlus">;
def OpenCL : LangOpt<"OpenCL">;
def RenderScript : LangOpt<"RenderScript">;
def ObjC : LangOpt<"ObjC">;
def BlocksSupported : LangOpt<"Blocks">;
def ObjCAutoRefCount : LangOpt<"ObjCAutoRefCount">;
def ObjCNonFragileRuntime : LangOpt<"ObjCNonFragileRuntime",
"LangOpts.ObjCRuntime.allowsClassStubs()">;
def ObjCNonFragileRuntime
: LangOpt<"", "LangOpts.ObjCRuntime.allowsClassStubs()">;
// Language option for CMSE extensions
def Cmse : LangOpt<"Cmse">;

5
clang/utils/TableGen/ClangAttrEmitter.cpp
View File

@ -1980,6 +1980,11 @@ static std::string GenerateTestExpression(ArrayRef<Record *> LangOpts) {
Test += "(";
Test += Code;
Test += ")";
if (!E->getValueAsString("Name").empty()) {
PrintWarning(
E->getLoc(),
"non-empty 'Name' field ignored because 'CustomCode' was supplied");
}
} else {
Test += "LangOpts.";
Test += E->getValueAsString("Name");