[cfe-dev] Location (in Source Code) of String Literal in MacroExpansion
chiasa.men via cfe-dev
cfe-dev at lists.llvm.org
Thu Aug 26 01:02:57 PDT 2021
https://gist.github.com/T35R6braPwgDJKq/6439fda090e4ee8440d726f8dafa4dbb#file-mectest-cpp
Above I modified the MacroExpansionContext unittest.
The relevant code:
//--------------
TEST_F(MacroExpansionContextTest, Custom) {
// From the GCC website.
const auto Ctx = getMacroExpansionContextFor(R"code(
#define CONCATMACRO(parm) L##parm
int f(wchar_t *b){}
int main()
{
int a= f(CONCATMACRO("TEST"));
int b= f(L"TEST");
return 0;
}
)code");
Ctx->dumpExpansionRanges();
//> :6:14, :6:33
Ctx->dumpExpandedTexts();
//> :6:14 -> 'L"TEST"'
printf("Exp: %s\n",Ctx->getExpandedText(at(6, 14)).getValue());
//Exp: L"TEST"
printf("Org: %s\n",Ctx->getOriginalText(at(6, 14)).getValue());
//Org: CONCATMACRO("TEST"));
// int b= f(L"TEST");
// return 0;
//}
StringRef sourceText =
clang::Lexer::getSourceText(CharSourceRange(SourceRange(at(6, 14),at(6,
33)),false),SourceMgr, LangOpts);
printf("sourceText: %s\n",sourceText);
// sourceText: CONCATMACRO("TEST"));
// int b= f(L"TEST");
// return 0;
// }
}
//--------------
I am interested in getting the range for "TEST" in the SourceText. Since the
CONCATMACRO is preprocessed to L"TEST" I thought the MacroExpansionContext
would be of help.
It tells about the ExpansionRanges: 6:14, :6:33 which is CONCATMACRO("TEST")
What I would need is: 6:26, 6:32
Obviously I could just calculate a bit like:
range.begin (14) + macronameLen (11) +1 (opening parenthesis) = 26
to
range.end (33) - 1 (closing parenthesis) = 32
But would that be reliable and is there no other way?
Furthermore: Why do getSourceText/getOriginalText print the whole rest of the
source code and not just from (6,14) to (6,33)?
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