================
@@ -421,13 +421,102 @@ void AIX::AddCXXStdlibLibArgs(const llvm::opt::ArgList
&Args,
llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
}
+// This function processes all the mtocdata options to build the final
+// simplified toc data options to pass to CC1.
+static void addTocDataOptions(const llvm::opt::ArgList &Args,
+ llvm::opt::ArgStringList &CC1Args,
+ const Driver &D) {
+
+ // Check the global toc-data setting. The default is -mno-tocdata.
+ // To enable toc-data globally, -mtocdata must be specified.
+ // Additionally, it must be last to take effect.
+ const bool TOCDataGloballyinEffect = [&Args]() {
+ if (!Args.hasArg(options::OPT_mtocdata))
+ return false;
+
+ const Arg *LastArg =
+ Args.getLastArg(options::OPT_mtocdata, options::OPT_mno_tocdata);
+ return LastArg->getOption().matches(options::OPT_mtocdata);
+ }();
+
+ // Currently only supported for small code model.
+ if (TOCDataGloballyinEffect &&
+ (Args.getLastArgValue(options::OPT_mcmodel_EQ).equals("large") ||
+ Args.getLastArgValue(options::OPT_mcmodel_EQ).equals("medium"))) {
+ D.Diag(clang::diag::warn_drv_unsupported_tocdata);
+ return;
+ }
+
+ enum TOCDataSetting {
+ AddressInTOC = 0, // Address of the symbol stored in the TOC.
+ DataInTOC = 1 // Symbol defined in the TOC.
+ };
+
+ const TOCDataSetting DefaultTocDataSetting =
+ TOCDataGloballyinEffect ? DataInTOC : AddressInTOC;
+
+ // Process the list of variables in the explicitly specified options
+ // -mtocdata= and -mno-tocdata= to see which variables are opposite to
+ // the global setting of tocdata in TOCDataGloballyinEffect.
+ // Those that have the opposite setting to TOCDataGloballyinEffect, are added
+ // to ExplicitlySpecifiedGlobals.
+ llvm::StringSet<> ExplicitlySpecifiedGlobals;
+ for (const auto Arg :
+ Args.filtered(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ)) {
+ TOCDataSetting ArgTocDataSetting =
+ Arg->getOption().matches(options::OPT_mtocdata_EQ) ? DataInTOC
+ : AddressInTOC;
+
+ if (ArgTocDataSetting != DefaultTocDataSetting)
+ for (const char *Val : Arg->getValues())
+ ExplicitlySpecifiedGlobals.insert(Val);
+ else
+ for (const char *Val : Arg->getValues())
+ ExplicitlySpecifiedGlobals.erase(Val);
+ }
----------------
diggerlin wrote:
"The code above defines a rule for handling multiple `-mno-tocdata=` and
`-mtocdata=`, and how they interact with `-mno-tocdata` and `-mtocdata` . I
believe users may not fully understand how these multiple options interact
without reading the code. Therefore, I think it would be beneficial to add
descriptions and some examples to the UsersManual.rst file.
https://github.com/llvm/llvm-project/pull/67999
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