From de6beb02a530a8da6e0525e99b9c1ab24252064e Mon Sep 17 00:00:00 2001 From: Scott Linder Date: Fri, 14 Dec 2018 15:38:15 +0000 Subject: Implement -frecord-command-line (-frecord-gcc-switches) Implement options in clang to enable recording the driver command-line in an ELF section. Implement a new special named metadata, llvm.commandline, to support frontends embedding their command-line options in IR/ASM/ELF. This differs from the GCC implementation in some key ways: * In GCC there is only one command-line possible per compilation-unit, in LLVM it mirrors llvm.ident and multiple are allowed. * In GCC individual options are separated by NULL bytes, in LLVM entire command-lines are separated by NULL bytes. The advantage of the GCC approach is to clearly delineate options in the face of embedded spaces. The advantage of the LLVM approach is to support merging multiple command-lines unambiguously, while handling embedded spaces with escaping. Differential Revision: https://reviews.llvm.org/D54487 Clang Differential Revision: https://reviews.llvm.org/D54489 llvm-svn: 349155 --- clang/lib/CodeGen/CodeGenModule.cpp | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'clang/lib/CodeGen/CodeGenModule.cpp') diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp index 1b7bb2c..df814d6 100644 --- a/clang/lib/CodeGen/CodeGenModule.cpp +++ b/clang/lib/CodeGen/CodeGenModule.cpp @@ -590,6 +590,9 @@ void CodeGenModule::Release() { if (getCodeGenOpts().EmitVersionIdentMetadata) EmitVersionIdentMetadata(); + if (!getCodeGenOpts().RecordCommandLine.empty()) + EmitCommandLineMetadata(); + EmitTargetMetadata(); } @@ -5217,6 +5220,16 @@ void CodeGenModule::EmitVersionIdentMetadata() { IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode)); } +void CodeGenModule::EmitCommandLineMetadata() { + llvm::NamedMDNode *CommandLineMetadata = + TheModule.getOrInsertNamedMetadata("llvm.commandline"); + std::string CommandLine = getCodeGenOpts().RecordCommandLine; + llvm::LLVMContext &Ctx = TheModule.getContext(); + + llvm::Metadata *CommandLineNode[] = {llvm::MDString::get(Ctx, CommandLine)}; + CommandLineMetadata->addOperand(llvm::MDNode::get(Ctx, CommandLineNode)); +} + void CodeGenModule::EmitTargetMetadata() { // Warning, new MangledDeclNames may be appended within this loop. // We rely on MapVector insertions adding new elements to the end -- cgit v1.1