[llvm] r322005 - Emit Function IDs table for Control Flow Guard
Adrian McCarthy via llvm-commits
llvm-commits at lists.llvm.org
Mon Jan 8 08:33:42 PST 2018
Author: amccarth
Date: Mon Jan 8 08:33:42 2018
New Revision: 322005
URL: http://llvm.org/viewvc/llvm-project?rev=322005&view=rev
Log:
Emit Function IDs table for Control Flow Guard
Adds option /guard:cf to clang-cl and -cfguard to cc1 to emit function IDs
of functions that have their address taken into a section named .gfids$y for
compatibility with Microsoft's Control Flow Guard feature.
Differential Revision: https://reviews.llvm.org/D40531
Added:
llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.cpp
llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.h
llvm/trunk/test/CodeGen/WinCFGuard/
llvm/trunk/test/CodeGen/WinCFGuard/cfguard.ll
llvm/trunk/test/MC/COFF/symidx.s
Modified:
llvm/trunk/include/llvm/MC/MCObjectFileInfo.h
llvm/trunk/include/llvm/MC/MCStreamer.h
llvm/trunk/include/llvm/MC/MCWinCOFFStreamer.h
llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
llvm/trunk/lib/CodeGen/AsmPrinter/CMakeLists.txt
llvm/trunk/lib/MC/MCAsmStreamer.cpp
llvm/trunk/lib/MC/MCObjectFileInfo.cpp
llvm/trunk/lib/MC/MCParser/COFFAsmParser.cpp
llvm/trunk/lib/MC/MCStreamer.cpp
llvm/trunk/lib/MC/MCWinCOFFStreamer.cpp
Modified: llvm/trunk/include/llvm/MC/MCObjectFileInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCObjectFileInfo.h?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCObjectFileInfo.h (original)
+++ llvm/trunk/include/llvm/MC/MCObjectFileInfo.h Mon Jan 8 08:33:42 2018
@@ -196,6 +196,7 @@ protected:
MCSection *PDataSection;
MCSection *XDataSection;
MCSection *SXDataSection;
+ MCSection *GFIDsSection;
public:
void InitMCObjectFileInfo(const Triple &TT, bool PIC, MCContext &ctx,
@@ -349,6 +350,7 @@ public:
MCSection *getPDataSection() const { return PDataSection; }
MCSection *getXDataSection() const { return XDataSection; }
MCSection *getSXDataSection() const { return SXDataSection; }
+ MCSection *getGFIDsSection() const { return GFIDsSection; }
MCSection *getEHFrameSection() {
return EHFrameSection;
Modified: llvm/trunk/include/llvm/MC/MCStreamer.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCStreamer.h?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCStreamer.h (original)
+++ llvm/trunk/include/llvm/MC/MCStreamer.h Mon Jan 8 08:33:42 2018
@@ -499,6 +499,9 @@ public:
virtual void EmitCOFFSafeSEH(MCSymbol const *Symbol);
+ /// \brief Emits the symbol table index of a Symbol into the current section.
+ virtual void EmitCOFFSymbolIndex(MCSymbol const *Symbol);
+
/// \brief Emits a COFF section index.
///
/// \param Symbol - Symbol the section number relocation should point to.
Modified: llvm/trunk/include/llvm/MC/MCWinCOFFStreamer.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCWinCOFFStreamer.h?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCWinCOFFStreamer.h (original)
+++ llvm/trunk/include/llvm/MC/MCWinCOFFStreamer.h Mon Jan 8 08:33:42 2018
@@ -50,6 +50,7 @@ public:
void EmitCOFFSymbolType(int Type) override;
void EndCOFFSymbolDef() override;
void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
+ void EmitCOFFSymbolIndex(MCSymbol const *Symbol) override;
void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) override;
void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp Mon Jan 8 08:33:42 2018
@@ -16,6 +16,7 @@
#include "CodeViewDebug.h"
#include "DwarfDebug.h"
#include "DwarfException.h"
+#include "WinCFGuard.h"
#include "WinException.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
@@ -130,6 +131,8 @@ static const char *const DbgTimerName =
static const char *const DbgTimerDescription = "Debug Info Emission";
static const char *const EHTimerName = "write_exception";
static const char *const EHTimerDescription = "DWARF Exception Writer";
+static const char *const CFGuardName = "Control Flow Guard";
+static const char *const CFGuardDescription = "Control Flow Guard Tables";
static const char *const CodeViewLineTablesGroupName = "linetables";
static const char *const CodeViewLineTablesGroupDescription =
"CodeView Line Tables";
@@ -354,6 +357,13 @@ bool AsmPrinter::doInitialization(Module
if (ES)
Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
DWARFGroupName, DWARFGroupDescription));
+
+ if (mdconst::extract_or_null<ConstantInt>(
+ MMI->getModule()->getModuleFlag("cfguard")))
+ Handlers.push_back(HandlerInfo(new WinCFGuard(this), CFGuardName,
+ CFGuardDescription, DWARFGroupName,
+ DWARFGroupDescription));
+
return false;
}
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/CMakeLists.txt?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/CMakeLists.txt (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/CMakeLists.txt Mon Jan 8 08:33:42 2018
@@ -20,6 +20,7 @@ add_llvm_library(LLVMAsmPrinter
EHStreamer.cpp
ErlangGCPrinter.cpp
OcamlGCPrinter.cpp
+ WinCFGuard.cpp
WinException.cpp
CodeViewDebug.cpp
Added: llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.cpp?rev=322005&view=auto
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.cpp (added)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.cpp Mon Jan 8 08:33:42 2018
@@ -0,0 +1,45 @@
+//===-- CodeGen/AsmPrinter/WinCFGuard.cpp - Control Flow Guard Impl ------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing Win64 exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "WinCFGuard.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCStreamer.h"
+
+#include <vector>
+
+using namespace llvm;
+
+WinCFGuard::WinCFGuard(AsmPrinter *A) : AsmPrinterHandler(), Asm(A) {}
+
+WinCFGuard::~WinCFGuard() {}
+
+void WinCFGuard::endModule() {
+ const Module *M = Asm->MMI->getModule();
+ std::vector<const Function *> Functions;
+ for (const Function &F : *M)
+ if (F.hasAddressTaken())
+ Functions.push_back(&F);
+ if (Functions.empty())
+ return;
+ auto &OS = *Asm->OutStreamer;
+ OS.SwitchSection(Asm->OutContext.getObjectFileInfo()->getGFIDsSection());
+ for (const Function *F : Functions)
+ OS.EmitCOFFSymbolIndex(Asm->getSymbol(F));
+}
Added: llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.h?rev=322005&view=auto
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.h (added)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/WinCFGuard.h Mon Jan 8 08:33:42 2018
@@ -0,0 +1,54 @@
+//===-- WinCFGuard.h - Windows Control Flow Guard Handling ----*- C++ -*--===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing windows exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
+
+#include "AsmPrinterHandler.h"
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+
+class LLVM_LIBRARY_VISIBILITY WinCFGuard : public AsmPrinterHandler {
+ /// Target of directive emission.
+ AsmPrinter *Asm;
+
+public:
+ WinCFGuard(AsmPrinter *A);
+ ~WinCFGuard() override;
+
+ void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
+
+ /// \brief Emit the Control Flow Guard function ID table
+ void endModule() override;
+
+ /// \brief Gather pre-function debug information.
+ /// Every beginFunction(MF) call should be followed by an endFunction(MF)
+ /// call.
+ void beginFunction(const MachineFunction *MF) override {}
+
+ /// \brief Gather post-function debug information.
+ /// Please note that some AsmPrinter implementations may not call
+ /// beginFunction at all.
+ void endFunction(const MachineFunction *MF) override {}
+
+ /// \brief Process beginning of an instruction.
+ void beginInstruction(const MachineInstr *MI) override {}
+
+ /// \brief Process end of an instruction.
+ void endInstruction() override {}
+};
+
+} // namespace llvm
+
+#endif
Modified: llvm/trunk/lib/MC/MCAsmStreamer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCAsmStreamer.cpp?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCAsmStreamer.cpp (original)
+++ llvm/trunk/lib/MC/MCAsmStreamer.cpp Mon Jan 8 08:33:42 2018
@@ -151,6 +151,7 @@ public:
void EmitCOFFSymbolType(int Type) override;
void EndCOFFSymbolDef() override;
void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
+ void EmitCOFFSymbolIndex(MCSymbol const *Symbol) override;
void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) override;
void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
@@ -652,6 +653,12 @@ void MCAsmStreamer::EmitCOFFSafeSEH(MCSy
Symbol->print(OS, MAI);
EmitEOL();
}
+
+void MCAsmStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {
+ OS << "\t.symidx\t";
+ Symbol->print(OS, MAI);
+ EmitEOL();
+}
void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
OS << "\t.secidx\t";
Modified: llvm/trunk/lib/MC/MCObjectFileInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCObjectFileInfo.cpp?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCObjectFileInfo.cpp (original)
+++ llvm/trunk/lib/MC/MCObjectFileInfo.cpp Mon Jan 8 08:33:42 2018
@@ -819,6 +819,11 @@ void MCObjectFileInfo::initCOFFMCObjectF
SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
SectionKind::getMetadata());
+ GFIDsSection = Ctx->getCOFFSection(".gfids$y",
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ,
+ SectionKind::getMetadata());
+
TLSDataSection = Ctx->getCOFFSection(
".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE,
Modified: llvm/trunk/lib/MC/MCParser/COFFAsmParser.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCParser/COFFAsmParser.cpp?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCParser/COFFAsmParser.cpp (original)
+++ llvm/trunk/lib/MC/MCParser/COFFAsmParser.cpp Mon Jan 8 08:33:42 2018
@@ -65,8 +65,9 @@ class COFFAsmParser : public MCAsmParser
addDirectiveHandler<&COFFAsmParser::ParseDirectiveType>(".type");
addDirectiveHandler<&COFFAsmParser::ParseDirectiveEndef>(".endef");
addDirectiveHandler<&COFFAsmParser::ParseDirectiveSecRel32>(".secrel32");
- addDirectiveHandler<&COFFAsmParser::ParseDirectiveSecIdx>(".secidx");
+ addDirectiveHandler<&COFFAsmParser::ParseDirectiveSymIdx>(".symidx");
addDirectiveHandler<&COFFAsmParser::ParseDirectiveSafeSEH>(".safeseh");
+ addDirectiveHandler<&COFFAsmParser::ParseDirectiveSecIdx>(".secidx");
addDirectiveHandler<&COFFAsmParser::ParseDirectiveLinkOnce>(".linkonce");
// Win64 EH directives.
@@ -130,6 +131,7 @@ class COFFAsmParser : public MCAsmParser
bool ParseDirectiveSecRel32(StringRef, SMLoc);
bool ParseDirectiveSecIdx(StringRef, SMLoc);
bool ParseDirectiveSafeSEH(StringRef, SMLoc);
+ bool ParseDirectiveSymIdx(StringRef, SMLoc);
bool parseCOMDATType(COFF::COMDATType &Type);
bool ParseDirectiveLinkOnce(StringRef, SMLoc);
@@ -520,6 +522,21 @@ bool COFFAsmParser::ParseDirectiveSecIdx
return false;
}
+bool COFFAsmParser::ParseDirectiveSymIdx(StringRef, SMLoc) {
+ StringRef SymbolID;
+ if (getParser().parseIdentifier(SymbolID))
+ return TokError("expected identifier in directive");
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in directive");
+
+ MCSymbol *Symbol = getContext().getOrCreateSymbol(SymbolID);
+
+ Lex();
+ getStreamer().EmitCOFFSymbolIndex(Symbol);
+ return false;
+}
+
/// ::= [ identifier ]
bool COFFAsmParser::parseCOMDATType(COFF::COMDATType &Type) {
StringRef TypeId = getTok().getIdentifier();
Modified: llvm/trunk/lib/MC/MCStreamer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCStreamer.cpp?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCStreamer.cpp (original)
+++ llvm/trunk/lib/MC/MCStreamer.cpp Mon Jan 8 08:33:42 2018
@@ -804,6 +804,8 @@ void MCStreamer::EmitWinCFIEndProlog(SML
void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
}
+void MCStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {}
+
void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
}
Modified: llvm/trunk/lib/MC/MCWinCOFFStreamer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCWinCOFFStreamer.cpp?rev=322005&r1=322004&r2=322005&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCWinCOFFStreamer.cpp (original)
+++ llvm/trunk/lib/MC/MCWinCOFFStreamer.cpp Mon Jan 8 08:33:42 2018
@@ -193,6 +193,17 @@ void MCWinCOFFStreamer::EmitCOFFSafeSEH(
<< COFF::SCT_COMPLEX_TYPE_SHIFT);
}
+void MCWinCOFFStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {
+ MCSection *Sec = getCurrentSectionOnly();
+ getAssembler().registerSection(*Sec);
+ if (Sec->getAlignment() < 4)
+ Sec->setAlignment(4);
+
+ new MCSymbolIdFragment(Symbol, getCurrentSectionOnly());
+
+ getAssembler().registerSymbol(*Symbol);
+}
+
void MCWinCOFFStreamer::EmitCOFFSectionIndex(const MCSymbol *Symbol) {
visitUsedSymbol(*Symbol);
MCDataFragment *DF = getOrCreateDataFragment();
Added: llvm/trunk/test/CodeGen/WinCFGuard/cfguard.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/WinCFGuard/cfguard.ll?rev=322005&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/WinCFGuard/cfguard.ll (added)
+++ llvm/trunk/test/CodeGen/WinCFGuard/cfguard.ll Mon Jan 8 08:33:42 2018
@@ -0,0 +1,162 @@
+; RUN: llc < %s | FileCheck %s
+
+; CHECK: .section .gfids$y
+; CHECK: .symidx "?address_taken@@YAXXZ"
+; CHECK: .symidx "?virt_method at Derived@@UEBAHXZ"
+
+; ModuleID = 'cfguard.cpp'
+source_filename = "cfguard.cpp"
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+%struct.Derived = type { %struct.Base }
+%struct.Base = type { i32 (...)** }
+%rtti.CompleteObjectLocator = type { i32, i32, i32, i32, i32, i32 }
+%rtti.TypeDescriptor13 = type { i8**, i8*, [14 x i8] }
+%rtti.ClassHierarchyDescriptor = type { i32, i32, i32, i32 }
+%rtti.BaseClassDescriptor = type { i32, i32, i32, i32, i32, i32, i32 }
+%rtti.TypeDescriptor10 = type { i8**, i8*, [11 x i8] }
+
+$"\01??0Derived@@QEAA at XZ" = comdat any
+
+$"\01??0Base@@QEAA at XZ" = comdat any
+
+$"\01?virt_method at Derived@@UEBAHXZ" = comdat any
+
+$"\01??_7Derived@@6B@" = comdat largest
+
+$"\01??_R4Derived@@6B@" = comdat any
+
+$"\01??_R0?AUDerived@@@8" = comdat any
+
+$"\01??_R3Derived@@8" = comdat any
+
+$"\01??_R2Derived@@8" = comdat any
+
+$"\01??_R1A@?0A at EA@Derived@@8" = comdat any
+
+$"\01??_R1A@?0A at EA@Base@@8" = comdat any
+
+$"\01??_R0?AUBase@@@8" = comdat any
+
+$"\01??_R3Base@@8" = comdat any
+
+$"\01??_R2Base@@8" = comdat any
+
+$"\01??_7Base@@6B@" = comdat largest
+
+$"\01??_R4Base@@6B@" = comdat any
+
+@"\01?D@@3UDerived@@A" = global %struct.Derived zeroinitializer, align 8
+ at 0 = private unnamed_addr constant { [2 x i8*] } { [2 x i8*] [i8* bitcast (%rtti.CompleteObjectLocator* @"\01??_R4Derived@@6B@" to i8*), i8* bitcast (i32 (%struct.Derived*)* @"\01?virt_method at Derived@@UEBAHXZ" to i8*)] }, comdat($"\01??_7Derived@@6B@")
+@"\01??_R4Derived@@6B@" = linkonce_odr constant %rtti.CompleteObjectLocator { i32 1, i32 0, i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor13* @"\01??_R0?AUDerived@@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.ClassHierarchyDescriptor* @"\01??_R3Derived@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.CompleteObjectLocator* @"\01??_R4Derived@@6B@" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, comdat
+@"\01??_7type_info@@6B@" = external constant i8*
+@"\01??_R0?AUDerived@@@8" = linkonce_odr global %rtti.TypeDescriptor13 { i8** @"\01??_7type_info@@6B@", i8* null, [14 x i8] c".?AUDerived@@\00" }, comdat
+ at __ImageBase = external constant i8
+@"\01??_R3Derived@@8" = linkonce_odr constant %rtti.ClassHierarchyDescriptor { i32 0, i32 0, i32 2, i32 trunc (i64 sub nuw nsw (i64 ptrtoint ([3 x i32]* @"\01??_R2Derived@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, comdat
+@"\01??_R2Derived@@8" = linkonce_odr constant [3 x i32] [i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.BaseClassDescriptor* @"\01??_R1A@?0A at EA@Derived@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.BaseClassDescriptor* @"\01??_R1A@?0A at EA@Base@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 0], comdat
+@"\01??_R1A@?0A at EA@Derived@@8" = linkonce_odr constant %rtti.BaseClassDescriptor { i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor13* @"\01??_R0?AUDerived@@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 1, i32 0, i32 -1, i32 0, i32 64, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.ClassHierarchyDescriptor* @"\01??_R3Derived@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, comdat
+@"\01??_R1A@?0A at EA@Base@@8" = linkonce_odr constant %rtti.BaseClassDescriptor { i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor10* @"\01??_R0?AUBase@@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 0, i32 0, i32 -1, i32 0, i32 64, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.ClassHierarchyDescriptor* @"\01??_R3Base@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, comdat
+@"\01??_R0?AUBase@@@8" = linkonce_odr global %rtti.TypeDescriptor10 { i8** @"\01??_7type_info@@6B@", i8* null, [11 x i8] c".?AUBase@@\00" }, comdat
+@"\01??_R3Base@@8" = linkonce_odr constant %rtti.ClassHierarchyDescriptor { i32 0, i32 0, i32 1, i32 trunc (i64 sub nuw nsw (i64 ptrtoint ([2 x i32]* @"\01??_R2Base@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, comdat
+@"\01??_R2Base@@8" = linkonce_odr constant [2 x i32] [i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.BaseClassDescriptor* @"\01??_R1A@?0A at EA@Base@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 0], comdat
+ at 1 = private unnamed_addr constant { [2 x i8*] } { [2 x i8*] [i8* bitcast (%rtti.CompleteObjectLocator* @"\01??_R4Base@@6B@" to i8*), i8* bitcast (void ()* @_purecall to i8*)] }, comdat($"\01??_7Base@@6B@")
+@"\01??_R4Base@@6B@" = linkonce_odr constant %rtti.CompleteObjectLocator { i32 1, i32 0, i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor10* @"\01??_R0?AUBase@@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.ClassHierarchyDescriptor* @"\01??_R3Base@@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.CompleteObjectLocator* @"\01??_R4Base@@6B@" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, comdat
+ at llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_cfguard.cpp, i8* null }]
+
+@"\01??_7Derived@@6B@" = unnamed_addr alias i8*, getelementptr inbounds ({ [2 x i8*] }, { [2 x i8*] }* @0, i32 0, i32 0, i32 1)
+@"\01??_7Base@@6B@" = unnamed_addr alias i8*, getelementptr inbounds ({ [2 x i8*] }, { [2 x i8*] }* @1, i32 0, i32 0, i32 1)
+
+; Function Attrs: noinline nounwind
+define internal void @"\01??__ED@@YAXXZ"() #0 {
+entry:
+ %call = call %struct.Derived* @"\01??0Derived@@QEAA at XZ"(%struct.Derived* @"\01?D@@3UDerived@@A") #2
+ ret void
+}
+
+; Function Attrs: noinline nounwind optnone
+define linkonce_odr %struct.Derived* @"\01??0Derived@@QEAA at XZ"(%struct.Derived* returned %this) unnamed_addr #1 comdat align 2 {
+entry:
+ %this.addr = alloca %struct.Derived*, align 8
+ store %struct.Derived* %this, %struct.Derived** %this.addr, align 8
+ %this1 = load %struct.Derived*, %struct.Derived** %this.addr, align 8
+ %0 = bitcast %struct.Derived* %this1 to %struct.Base*
+ %call = call %struct.Base* @"\01??0Base@@QEAA at XZ"(%struct.Base* %0) #2
+ %1 = bitcast %struct.Derived* %this1 to i32 (...)***
+ store i32 (...)** bitcast (i8** @"\01??_7Derived@@6B@" to i32 (...)**), i32 (...)*** %1, align 8
+ ret %struct.Derived* %this1
+}
+
+; Function Attrs: noinline nounwind optnone
+define void @"\01?address_taken@@YAXXZ"() #1 {
+entry:
+ ret void
+}
+
+; Function Attrs: noinline nounwind optnone
+define void ()* @"\01?foo@@YAP6AXXZPEAUBase@@@Z"(%struct.Base* %B) #1 {
+entry:
+ %retval = alloca void ()*, align 8
+ %B.addr = alloca %struct.Base*, align 8
+ store %struct.Base* %B, %struct.Base** %B.addr, align 8
+ %0 = load %struct.Base*, %struct.Base** %B.addr, align 8
+ %1 = bitcast %struct.Base* %0 to i32 (%struct.Base*)***
+ %vtable = load i32 (%struct.Base*)**, i32 (%struct.Base*)*** %1, align 8
+ %vfn = getelementptr inbounds i32 (%struct.Base*)*, i32 (%struct.Base*)** %vtable, i64 0
+ %2 = load i32 (%struct.Base*)*, i32 (%struct.Base*)** %vfn, align 8
+ %call = call i32 %2(%struct.Base* %0)
+ %tobool = icmp ne i32 %call, 0
+ br i1 %tobool, label %if.then, label %if.end
+
+if.then: ; preds = %entry
+ store void ()* @"\01?address_taken@@YAXXZ", void ()** %retval, align 8
+ br label %return
+
+if.end: ; preds = %entry
+ store void ()* null, void ()** %retval, align 8
+ br label %return
+
+return: ; preds = %if.end, %if.then
+ %3 = load void ()*, void ()** %retval, align 8
+ ret void ()* %3
+}
+
+; Function Attrs: noinline nounwind optnone
+define linkonce_odr %struct.Base* @"\01??0Base@@QEAA at XZ"(%struct.Base* returned %this) unnamed_addr #1 comdat align 2 {
+entry:
+ %this.addr = alloca %struct.Base*, align 8
+ store %struct.Base* %this, %struct.Base** %this.addr, align 8
+ %this1 = load %struct.Base*, %struct.Base** %this.addr, align 8
+ %0 = bitcast %struct.Base* %this1 to i32 (...)***
+ store i32 (...)** bitcast (i8** @"\01??_7Base@@6B@" to i32 (...)**), i32 (...)*** %0, align 8
+ ret %struct.Base* %this1
+}
+
+; Function Attrs: noinline nounwind optnone
+define linkonce_odr i32 @"\01?virt_method at Derived@@UEBAHXZ"(%struct.Derived* %this) unnamed_addr #1 comdat align 2 {
+entry:
+ %this.addr = alloca %struct.Derived*, align 8
+ store %struct.Derived* %this, %struct.Derived** %this.addr, align 8
+ %this1 = load %struct.Derived*, %struct.Derived** %this.addr, align 8
+ ret i32 42
+}
+
+declare dllimport void @_purecall() unnamed_addr
+
+; Function Attrs: noinline nounwind
+define internal void @_GLOBAL__sub_I_cfguard.cpp() #0 {
+entry:
+ call void @"\01??__ED@@YAXXZ"()
+ ret void
+}
+
+attributes #0 = { noinline nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { noinline nounwind optnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind }
+
+!llvm.module.flags = !{!0, !1}
+!llvm.ident = !{!2}
+
+!0 = !{i32 2, !"cfguard", i32 1}
+!1 = !{i32 1, !"wchar_size", i32 2}
+!2 = !{!"clang version 6.0.0 "}
Added: llvm/trunk/test/MC/COFF/symidx.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/COFF/symidx.s?rev=322005&view=auto
==============================================================================
--- llvm/trunk/test/MC/COFF/symidx.s (added)
+++ llvm/trunk/test/MC/COFF/symidx.s Mon Jan 8 08:33:42 2018
@@ -0,0 +1,15 @@
+// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-objdump -s -t - | FileCheck %s
+.text
+foo:
+ ret
+bar:
+ ret
+.data
+.symidx bar
+.symidx foo
+
+// CHECK: Contents of section .data:
+// CHECK-NEXT: 0000 0[[BAR:[1-9]]]000000 0[[FOO:[1-9]]]000000
+// CHECK: SYMBOL TABLE:
+// CHECK: [ [[FOO]]](sec 1)(fl 0x00)(ty 0)(scl 3) (nx 0) 0x00000000 foo
+// CHECK-NEXT: [ [[BAR]]](sec 1)(fl 0x00)(ty 0)(scl 3) (nx 0) 0x00000001 bar
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