From fb532b9a340958494a5346f2230d51653e8ed31e Mon Sep 17 00:00:00 2001 From: Peter Collingbourne Date: Wed, 24 Feb 2016 20:46:36 +0000 Subject: Add whole-program vtable optimization feature to Clang. This patch introduces the -fwhole-program-vtables flag, which enables the whole-program vtable optimization feature (D16795) in Clang. Differential Revision: http://reviews.llvm.org/D16821 llvm-svn: 261767 --- clang/lib/Driver/Tools.cpp | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'clang/lib/Driver/Tools.cpp') diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp index 00128dc7a32..0206281ae29 100644 --- a/clang/lib/Driver/Tools.cpp +++ b/clang/lib/Driver/Tools.cpp @@ -4270,6 +4270,32 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA, CmdArgs.push_back("-ffunction-sections"); } + if (Args.hasArg(options::OPT_fwhole_program_vtables, + options::OPT_fno_whole_program_vtables, false)) { + if (!D.isUsingLTO()) + D.Diag(diag::err_drv_argument_only_allowed_with) + << "-fwhole-program-vtables" + << "-flto"; + CmdArgs.push_back("-fwhole-program-vtables"); + + clang::SmallString<64> Path(D.ResourceDir); + llvm::sys::path::append(Path, "vtables_blacklist.txt"); + if (llvm::sys::fs::exists(Path)) { + SmallString<64> BlacklistOpt("-fwhole-program-vtables-blacklist="); + BlacklistOpt += Path.str(); + CmdArgs.push_back(Args.MakeArgString(BlacklistOpt)); + } + + for (const Arg *A : + Args.filtered(options::OPT_fwhole_program_vtables_blacklist_EQ)) { + A->claim(); + if (!llvm::sys::fs::exists(A->getValue())) + D.Diag(clang::diag::err_drv_no_such_file) << A->getValue(); + } + + Args.AddAllArgs(CmdArgs, options::OPT_fwhole_program_vtables_blacklist_EQ); + } + if (Args.hasFlag(options::OPT_fdata_sections, options::OPT_fno_data_sections, UseSeparateSections)) { CmdArgs.push_back("-fdata-sections"); -- cgit v1.2.3