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[mc-coff] Forward Linker Option flags into the .drectve section
Summary: This is modelled on the Mach-O linker options implementation and should support a Clang implementation of #pragma comment(lib/linker). Reviewers: rafael CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D724 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180569 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -128,6 +128,12 @@ public:
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virtual const MCSection *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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/// emitModuleFlags - Emit Obj-C garbage collection and linker options. Only
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/// linker option emission is implemented for COFF.
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virtual void emitModuleFlags(MCStreamer &Streamer,
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ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
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Mangler *Mang, const TargetMachine &TM) const;
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};
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} // end namespace llvm
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@ -782,3 +782,49 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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return getDataSection();
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}
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void TargetLoweringObjectFileCOFF::
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emitModuleFlags(MCStreamer &Streamer,
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ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
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Mangler *Mang, const TargetMachine &TM) const {
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MDNode *LinkerOptions = 0;
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// Look for the "Linker Options" flag, since it's the only one we support.
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for (ArrayRef<Module::ModuleFlagEntry>::iterator
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i = ModuleFlags.begin(), e = ModuleFlags.end(); i != e; ++i) {
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const Module::ModuleFlagEntry &MFE = *i;
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StringRef Key = MFE.Key->getString();
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Value *Val = MFE.Val;
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if (Key == "Linker Options") {
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LinkerOptions = cast<MDNode>(Val);
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break;
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}
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}
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if (!LinkerOptions)
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return;
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// Emit the linker options to the linker .drectve section. According to the
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// spec, this section is a space-separated string containing flags for linker.
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const MCSection *Sec = getDrectveSection();
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Streamer.SwitchSection(Sec);
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for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
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MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
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for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
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MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
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StringRef Op = MDOption->getString();
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// Lead with a space for consistency with our dllexport implementation.
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std::string Escaped(" ");
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if (Op.find(" ") != StringRef::npos) {
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// The PE-COFF spec says args with spaces must be quoted. It doesn't say
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// how to escape quotes, but it probably uses this algorithm:
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// http://msdn.microsoft.com/en-us/library/17w5ykft(v=vs.85).aspx
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// FIXME: Reuse escaping code from Support/Windows/Program.inc
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Escaped.push_back('\"');
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Escaped.append(Op);
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Escaped.push_back('\"');
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} else {
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Escaped.append(Op);
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}
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Streamer.EmitBytes(Escaped);
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}
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}
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}
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21
test/MC/COFF/linker-options.ll
Executable file
21
test/MC/COFF/linker-options.ll
Executable file
@ -0,0 +1,21 @@
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; RUN: llc -O0 -mtriple=i386-pc-win32 -filetype=asm -o - %s | FileCheck %s
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!0 = metadata !{ i32 6, metadata !"Linker Options",
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metadata !{
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metadata !{ metadata !"/DEFAULTLIB:msvcrt.lib" },
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metadata !{ metadata !"/DEFAULTLIB:msvcrt.lib",
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metadata !"/DEFAULTLIB:secur32.lib" },
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metadata !{ metadata !"/with spaces" } } }
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!llvm.module.flags = !{ !0 }
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define dllexport void @foo() {
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ret void
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}
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; CHECK: .section .drectve,"r"
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; CHECK: .ascii " /DEFAULTLIB:msvcrt.lib"
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; CHECK: .ascii " /DEFAULTLIB:msvcrt.lib"
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; CHECK: .ascii " /DEFAULTLIB:secur32.lib"
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; CHECK: .ascii " \"/with spaces\""
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; CHECK: .ascii " /EXPORT:_foo"
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