[lld] r267208 - ELF: Implement basic support for --version-script.
Rafael Espíndola via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 22 14:49:38 PDT 2016
Thanks!
On 22 April 2016 at 16:21, Peter Collingbourne via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: pcc
> Date: Fri Apr 22 15:21:26 2016
> New Revision: 267208
>
> URL: http://llvm.org/viewvc/llvm-project?rev=267208&view=rev
> Log:
> ELF: Implement basic support for --version-script.
>
> This patch only implements support for version scripts of the form:
> { [ global: symbol1; symbol2; [...]; symbolN; ] local: *; };
> No wildcards are supported, other than for the local entry. Symbol versioning
> is also not supported.
>
> It works by introducing a new Symbol flag which tracks whether a symbol
> appears in the global section of a version script.
>
> This patch also simplifies the logic in SymbolBody::isPreemptible(), and
> teaches it to handle the case where symbols with default visibility in DSOs
> do not appear in the dynamic symbol table because of a version script.
>
> Fixes PR27482.
>
> Differential Revision: http://reviews.llvm.org/D19430
>
> Added:
> lld/trunk/ELF/SymbolListFile.cpp
> - copied, changed from r267204, lld/trunk/ELF/DynamicList.cpp
> lld/trunk/ELF/SymbolListFile.h
> - copied, changed from r267204, lld/trunk/ELF/DynamicList.h
> lld/trunk/test/ELF/lto/internalize-version-script.ll
> lld/trunk/test/ELF/version-script.s
> Removed:
> lld/trunk/ELF/DynamicList.cpp
> lld/trunk/ELF/DynamicList.h
> Modified:
> lld/trunk/ELF/CMakeLists.txt
> lld/trunk/ELF/Config.h
> lld/trunk/ELF/Driver.cpp
> lld/trunk/ELF/Driver.h
> lld/trunk/ELF/Options.td
> lld/trunk/ELF/SymbolTable.cpp
> lld/trunk/ELF/SymbolTable.h
> lld/trunk/ELF/Symbols.cpp
> lld/trunk/ELF/Symbols.h
> lld/trunk/test/ELF/no-inhibit-exec.s
>
> Modified: lld/trunk/ELF/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/CMakeLists.txt?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/CMakeLists.txt (original)
> +++ lld/trunk/ELF/CMakeLists.txt Fri Apr 22 15:21:26 2016
> @@ -5,7 +5,6 @@ add_public_tablegen_target(ELFOptionsTab
> add_lld_library(lldELF
> Driver.cpp
> DriverUtils.cpp
> - DynamicList.cpp
> Error.cpp
> ICF.cpp
> InputFiles.cpp
> @@ -15,6 +14,7 @@ add_lld_library(lldELF
> MarkLive.cpp
> OutputSections.cpp
> ScriptParser.cpp
> + SymbolListFile.cpp
> SymbolTable.cpp
> Symbols.cpp
> Target.cpp
>
> Modified: lld/trunk/ELF/Config.h
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Config.h?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/Config.h (original)
> +++ lld/trunk/ELF/Config.h Fri Apr 22 15:21:26 2016
> @@ -51,6 +51,7 @@ struct Configuration {
> std::vector<llvm::StringRef> DynamicList;
> std::vector<llvm::StringRef> SearchPaths;
> std::vector<llvm::StringRef> Undefined;
> + std::vector<llvm::StringRef> VersionScriptGlobals;
> bool AllowMultipleDefinition;
> bool AsNeeded = false;
> bool Bsymbolic;
> @@ -85,6 +86,7 @@ struct Configuration {
> bool Threads;
> bool Trace;
> bool Verbose;
> + bool VersionScript;
> bool WarnCommon;
> bool ZExecStack;
> bool ZNodelete;
>
> Modified: lld/trunk/ELF/Driver.cpp
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Driver.cpp?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/Driver.cpp (original)
> +++ lld/trunk/ELF/Driver.cpp Fri Apr 22 15:21:26 2016
> @@ -9,11 +9,11 @@
>
> #include "Driver.h"
> #include "Config.h"
> -#include "DynamicList.h"
> #include "Error.h"
> #include "ICF.h"
> #include "InputFiles.h"
> #include "LinkerScript.h"
> +#include "SymbolListFile.h"
> #include "SymbolTable.h"
> #include "Target.h"
> #include "Writer.h"
> @@ -146,11 +146,6 @@ Optional<MemoryBufferRef> LinkerDriver::
> return MBRef;
> }
>
> -void LinkerDriver::readDynamicList(StringRef Path) {
> - if (Optional<MemoryBufferRef> Buffer = readFile(Path))
> - parseDynamicList(*Buffer);
> -}
> -
> // Add a given library by searching it from input search paths.
> void LinkerDriver::addLibrary(StringRef Name) {
> std::string Path = searchLibrary(Name);
> @@ -372,10 +367,18 @@ void LinkerDriver::readConfigs(opt::Inpu
> Config->Undefined.push_back(Arg->getValue());
>
> if (Args.hasArg(OPT_dynamic_list))
> - readDynamicList(getString(Args, OPT_dynamic_list));
> + if (Optional<MemoryBufferRef> Buffer =
> + readFile(getString(Args, OPT_dynamic_list)))
> + parseDynamicList(*Buffer);
>
> for (auto *Arg : Args.filtered(OPT_export_dynamic_symbol))
> Config->DynamicList.push_back(Arg->getValue());
> +
> + Config->VersionScript = Args.hasArg(OPT_version_script);
> + if (Config->VersionScript)
> + if (Optional<MemoryBufferRef> Buffer =
> + readFile(getString(Args, OPT_version_script)))
> + parseVersionScript(*Buffer);
> }
>
> void LinkerDriver::createFiles(opt::InputArgList &Args) {
> @@ -457,6 +460,7 @@ template <class ELFT> void LinkerDriver:
>
> Symtab.scanShlibUndefined();
> Symtab.scanDynamicList();
> + Symtab.scanVersionScript();
>
> Symtab.addCombinedLtoObject();
>
>
> Modified: lld/trunk/ELF/Driver.h
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Driver.h?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/Driver.h (original)
> +++ lld/trunk/ELF/Driver.h Fri Apr 22 15:21:26 2016
> @@ -32,7 +32,6 @@ private:
> std::vector<MemoryBufferRef> getArchiveMembers(MemoryBufferRef MB);
> llvm::Optional<MemoryBufferRef> readFile(StringRef Path);
> void readConfigs(llvm::opt::InputArgList &Args);
> - void readDynamicList(StringRef Path);
> void createFiles(llvm::opt::InputArgList &Args);
> template <class ELFT> void link(llvm::opt::InputArgList &Args);
>
>
> Removed: lld/trunk/ELF/DynamicList.cpp
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/DynamicList.cpp?rev=267207&view=auto
> ==============================================================================
> --- lld/trunk/ELF/DynamicList.cpp (original)
> +++ lld/trunk/ELF/DynamicList.cpp (removed)
> @@ -1,64 +0,0 @@
> -//===- LinkerScript.cpp ---------------------------------------------------===//
> -//
> -// The LLVM Linker
> -//
> -// This file is distributed under the University of Illinois Open Source
> -// License. See LICENSE.TXT for details.
> -//
> -//===----------------------------------------------------------------------===//
> -//
> -// This file contains the parser/evaluator of the linker script.
> -// It does not construct an AST but consume linker script directives directly.
> -// Results are written to Driver or Config object.
> -//
> -//===----------------------------------------------------------------------===//
> -
> -#include "DynamicList.h"
> -#include "Config.h"
> -#include "ScriptParser.h"
> -#include "llvm/Support/MemoryBuffer.h"
> -#include "llvm/Support/Path.h"
> -
> -using namespace llvm;
> -using namespace lld;
> -using namespace lld::elf;
> -
> -// Parse the --dynamic-list argument. A dynamic list is in the form
> -//
> -// { symbol1; symbol2; [...]; symbolN };
> -//
> -// Multiple groups can be defined in the same file and they are merged
> -// in only one definition.
> -
> -class DynamicListParser final : public ScriptParserBase {
> -public:
> - DynamicListParser(StringRef S) : ScriptParserBase(S) {}
> -
> - void run() override;
> -
> -private:
> - void readGroup();
> -};
> -
> -// Parse the default group definition using C language symbol name.
> -void DynamicListParser::readGroup() {
> - expect("{");
> - while (!Error) {
> - Config->DynamicList.push_back(next());
> - expect(";");
> - if (peek() == "}") {
> - next();
> - break;
> - }
> - }
> - expect(";");
> -}
> -
> -void DynamicListParser::run() {
> - while (!atEOF())
> - readGroup();
> -}
> -
> -void elf::parseDynamicList(MemoryBufferRef MB) {
> - DynamicListParser(MB.getBuffer()).run();
> -}
>
> Removed: lld/trunk/ELF/DynamicList.h
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/DynamicList.h?rev=267207&view=auto
> ==============================================================================
> --- lld/trunk/ELF/DynamicList.h (original)
> +++ lld/trunk/ELF/DynamicList.h (removed)
> @@ -1,24 +0,0 @@
> -//===- DynamicList.h --------------------------------------------*- C++ -*-===//
> -//
> -// The LLVM Linker
> -//
> -// This file is distributed under the University of Illinois Open Source
> -// License. See LICENSE.TXT for details.
> -//
> -//===----------------------------------------------------------------------===//
> -
> -#ifndef LLD_ELF_DYNAMIC_LIST_H
> -#define LLD_ELF_DYNAMIC_LIST_H
> -
> -#include "lld/Core/LLVM.h"
> -#include "llvm/Support/MemoryBuffer.h"
> -
> -namespace lld {
> -namespace elf {
> -
> -void parseDynamicList(MemoryBufferRef MB);
> -
> -} // namespace elf
> -} // namespace lld
> -
> -#endif
>
> Modified: lld/trunk/ELF/Options.td
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Options.td?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/Options.td (original)
> +++ lld/trunk/ELF/Options.td Fri Apr 22 15:21:26 2016
> @@ -160,6 +160,9 @@ def verbose : Flag<["--"], "verbose">;
> def version : Flag<["--", "-"], "version">,
> HelpText<"Display the version number">;
>
> +def version_script : Separate<["--", "-"], "version-script">,
> + HelpText<"Read a version script">;
> +
> def warn_common : Flag<["--", "-"], "warn-common">,
> HelpText<"Warn about duplicate common symbols">;
>
> @@ -234,7 +237,6 @@ def no_warn_common : Flag<["--", "-"], "
> def no_warn_mismatch : Flag<["--"], "no-warn-mismatch">;
> def rpath_link : Separate<["--", "-"], "rpath-link">;
> def rpath_link_eq : Joined<["--", "-"], "rpath-link=">;
> -def version_script : Separate<["--"], "version-script">;
> def warn_execstack : Flag<["--"], "warn-execstack">;
> def warn_shared_textrel : Flag<["--"], "warn-shared-textrel">;
> def G : Separate<["-"], "G">;
>
> Copied: lld/trunk/ELF/SymbolListFile.cpp (from r267204, lld/trunk/ELF/DynamicList.cpp)
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SymbolListFile.cpp?p2=lld/trunk/ELF/SymbolListFile.cpp&p1=lld/trunk/ELF/DynamicList.cpp&r1=267204&r2=267208&rev=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/DynamicList.cpp (original)
> +++ lld/trunk/ELF/SymbolListFile.cpp Fri Apr 22 15:21:26 2016
> @@ -1,4 +1,4 @@
> -//===- LinkerScript.cpp ---------------------------------------------------===//
> +//===- SymbolListFile.cpp -------------------------------------------------===//
> //
> // The LLVM Linker
> //
> @@ -13,7 +13,7 @@
> //
> //===----------------------------------------------------------------------===//
>
> -#include "DynamicList.h"
> +#include "SymbolListFile.h"
> #include "Config.h"
> #include "ScriptParser.h"
> #include "llvm/Support/MemoryBuffer.h"
> @@ -62,3 +62,42 @@ void DynamicListParser::run() {
> void elf::parseDynamicList(MemoryBufferRef MB) {
> DynamicListParser(MB.getBuffer()).run();
> }
> +
> +// Parse the --version-script argument. We currently only accept the following
> +// version script syntax:
> +//
> +// { [ global: symbol1; symbol2; [...]; symbolN; ] local: *; };
> +//
> +// No wildcards are supported, other than for the local entry. Symbol versioning
> +// is also not supported.
> +
> +class VersionScriptParser final : public ScriptParserBase {
> +public:
> + VersionScriptParser(StringRef S) : ScriptParserBase(S) {}
> +
> + void run() override;
> +};
> +
> +void VersionScriptParser::run() {
> + expect("{");
> + if (peek() == "global:") {
> + next();
> + while (!Error) {
> + Config->VersionScriptGlobals.push_back(next());
> + expect(";");
> + if (peek() == "local:")
> + break;
> + }
> + }
> + expect("local:");
> + expect("*");
> + expect(";");
> + expect("}");
> + expect(";");
> + if (!atEOF())
> + setError("expected EOF");
> +}
> +
> +void elf::parseVersionScript(MemoryBufferRef MB) {
> + VersionScriptParser(MB.getBuffer()).run();
> +}
>
> Copied: lld/trunk/ELF/SymbolListFile.h (from r267204, lld/trunk/ELF/DynamicList.h)
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SymbolListFile.h?p2=lld/trunk/ELF/SymbolListFile.h&p1=lld/trunk/ELF/DynamicList.h&r1=267204&r2=267208&rev=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/DynamicList.h (original)
> +++ lld/trunk/ELF/SymbolListFile.h Fri Apr 22 15:21:26 2016
> @@ -1,4 +1,4 @@
> -//===- DynamicList.h --------------------------------------------*- C++ -*-===//
> +//===- SymbolListFile.h -----------------------------------------*- C++ -*-===//
> //
> // The LLVM Linker
> //
> @@ -7,8 +7,8 @@
> //
> //===----------------------------------------------------------------------===//
>
> -#ifndef LLD_ELF_DYNAMIC_LIST_H
> -#define LLD_ELF_DYNAMIC_LIST_H
> +#ifndef LLD_ELF_SYMBOL_LIST_FILE_H
> +#define LLD_ELF_SYMBOL_LIST_FILE_H
>
> #include "lld/Core/LLVM.h"
> #include "llvm/Support/MemoryBuffer.h"
> @@ -17,6 +17,7 @@ namespace lld {
> namespace elf {
>
> void parseDynamicList(MemoryBufferRef MB);
> +void parseVersionScript(MemoryBufferRef MB);
>
> } // namespace elf
> } // namespace lld
>
> Modified: lld/trunk/ELF/SymbolTable.cpp
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SymbolTable.cpp?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/SymbolTable.cpp (original)
> +++ lld/trunk/ELF/SymbolTable.cpp Fri Apr 22 15:21:26 2016
> @@ -290,7 +290,12 @@ template <class ELFT> Symbol *SymbolTabl
> auto P = Symtab.insert(std::make_pair(Name, NumSyms));
> Symbol *Sym;
> if (P.second) {
> - Sym = new (Alloc) Symbol{New, STV_DEFAULT, false, false};
> + Sym = new (Alloc) Symbol;
> + Sym->Body = New;
> + Sym->Visibility = STV_DEFAULT;
> + Sym->IsUsedInRegularObj = false;
> + Sym->ExportDynamic = false;
> + Sym->VersionScriptGlobal = !Config->VersionScript;
> SymVector.push_back(Sym);
> } else {
> Sym = SymVector[P.first->second];
> @@ -374,6 +379,15 @@ template <class ELFT> void SymbolTable<E
> B->Backref->ExportDynamic = true;
> }
>
> +// This function processes the --version-script option by marking all global
> +// symbols with the VersionScriptGlobal flag, which acts as a filter on the
> +// dynamic symbol table.
> +template <class ELFT> void SymbolTable<ELFT>::scanVersionScript() {
> + for (StringRef S : Config->VersionScriptGlobals)
> + if (SymbolBody *B = find(S))
> + B->Backref->VersionScriptGlobal = true;
> +}
> +
> template class elf::SymbolTable<ELF32LE>;
> template class elf::SymbolTable<ELF32BE>;
> template class elf::SymbolTable<ELF64LE>;
>
> Modified: lld/trunk/ELF/SymbolTable.h
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SymbolTable.h?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/SymbolTable.h (original)
> +++ lld/trunk/ELF/SymbolTable.h Fri Apr 22 15:21:26 2016
> @@ -61,6 +61,7 @@ public:
>
> void scanShlibUndefined();
> void scanDynamicList();
> + void scanVersionScript();
> SymbolBody *find(StringRef Name);
> void wrap(StringRef Name);
> InputFile *findFile(SymbolBody *B);
>
> Modified: lld/trunk/ELF/Symbols.cpp
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Symbols.cpp?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/Symbols.cpp (original)
> +++ lld/trunk/ELF/Symbols.cpp Fri Apr 22 15:21:26 2016
> @@ -115,31 +115,26 @@ bool SymbolBody::isPreemptible() const {
> if (isLocal())
> return false;
>
> + // Shared symbols resolve to the definition in the DSO.
> if (isShared())
> return true;
>
> - if (Backref->Visibility != STV_DEFAULT)
> + // That's all that can be preempted in a non-DSO.
> + if (!Config->Shared)
> return false;
>
> - if (isUndefined()) {
> - if (!isWeak())
> - return true;
> -
> - // Ideally the static linker should see a definition for every symbol, but
> - // shared object are normally allowed to have undefined references that the
> - // static linker never sees a definition for.
> - if (Config->Shared)
> - return true;
> -
> - // Otherwise, just resolve to 0.
> - return false;
> - }
> + // Undefined symbols in DSOs can only be preempted if they are strong.
> + // Weak symbols just resolve to zero.
> + if (isUndefined())
> + return !isWeak();
>
> - if (!Config->Shared)
> - return false;
> + // -Bsymbolic means that not even default visibility symbols can be preempted.
> if (Config->Bsymbolic || (Config->BsymbolicFunctions && isFunc()))
> return false;
> - return true;
> +
> + // Only default visibility symbols that appear in the dynamic symbol table can
> + // be preempted.
> + return Backref->Visibility == STV_DEFAULT && Backref->includeInDynsym();
> }
>
> template <class ELFT>
> @@ -328,7 +323,7 @@ std::string elf::demangle(StringRef Name
> bool Symbol::includeInDynsym() const {
> if (Visibility != STV_DEFAULT && Visibility != STV_PROTECTED)
> return false;
> - return ExportDynamic || Body->isShared();
> + return (ExportDynamic && VersionScriptGlobal) || Body->isShared();
> }
>
> template uint32_t SymbolBody::template getVA<ELF32LE>(uint32_t) const;
>
> Modified: lld/trunk/ELF/Symbols.h
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Symbols.h?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/ELF/Symbols.h (original)
> +++ lld/trunk/ELF/Symbols.h Fri Apr 22 15:21:26 2016
> @@ -60,6 +60,11 @@ struct Symbol {
> // --export-dynamic, and by dynamic lists.
> unsigned ExportDynamic : 1;
>
> + // This flag acts as an additional filter on the dynamic symbol list. It is
> + // set if there is no version script, or if the symbol appears in the global
> + // section of the version script.
> + unsigned VersionScriptGlobal : 1;
> +
> bool includeInDynsym() const;
> };
>
>
> Added: lld/trunk/test/ELF/lto/internalize-version-script.ll
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/lto/internalize-version-script.ll?rev=267208&view=auto
> ==============================================================================
> --- lld/trunk/test/ELF/lto/internalize-version-script.ll (added)
> +++ lld/trunk/test/ELF/lto/internalize-version-script.ll Fri Apr 22 15:21:26 2016
> @@ -0,0 +1,22 @@
> +; REQUIRES: x86
> +; RUN: llvm-as %s -o %t.o
> +; RUN: echo "{ global: foo; local: *; };" > %t.script
> +; RUN: ld.lld -m elf_x86_64 %t.o -o %t2 -shared --version-script %t.script -save-temps
> +; RUN: llvm-dis < %t2.lto.bc | FileCheck %s
> +
> +target triple = "x86_64-unknown-linux-gnu"
> +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
> +
> +define void @foo() {
> + ret void
> +}
> +
> +define void @bar() {
> + ret void
> +}
> +
> +; Check that foo is not internalized.
> +; CHECK: define void @foo()
> +
> +; Check that bar is correctly internalized.
> +; CHECK: define internal void @bar()
>
> Modified: lld/trunk/test/ELF/no-inhibit-exec.s
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/no-inhibit-exec.s?rev=267208&r1=267207&r2=267208&view=diff
> ==============================================================================
> --- lld/trunk/test/ELF/no-inhibit-exec.s (original)
> +++ lld/trunk/test/ELF/no-inhibit-exec.s Fri Apr 22 15:21:26 2016
> @@ -6,7 +6,7 @@
>
> # CHECK: Disassembly of section .text:
> # CHECK-NEXT: _start
> -# CHECK-NEXT: 11000: e8 00 00 00 00 callq 0
> +# CHECK-NEXT: 11000: e8 fb ef fe ff callq -69637
>
> # next code will not link without noinhibit-exec flag
> # because of undefined symbol _bar
>
> Added: lld/trunk/test/ELF/version-script.s
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/version-script.s?rev=267208&view=auto
> ==============================================================================
> --- lld/trunk/test/ELF/version-script.s (added)
> +++ lld/trunk/test/ELF/version-script.s Fri Apr 22 15:21:26 2016
> @@ -0,0 +1,126 @@
> +# REQUIRES: x86
> +
> +# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/shared.s -o %t2.o
> +# RUN: ld.lld -shared %t2.o -soname shared -o %t2.so
> +
> +# RUN: echo "{ global: foo1; foo3; local: *; };" > %t.script
> +# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
> +# RUN: ld.lld --version-script %t.script -shared %t.o %t2.so -o %t.so
> +# RUN: llvm-readobj -dyn-symbols %t.so | FileCheck --check-prefix=DSO %s
> +
> +# RUN: echo "{ local: *; };" > %t3.script
> +# RUN: ld.lld --version-script %t3.script -shared %t.o %t2.so -o %t3.so
> +# RUN: llvm-readobj -dyn-symbols %t3.so | FileCheck --check-prefix=DSO2 %s
> +
> +# --version-script filters --dynamic-list.
> +# RUN: echo "{ foo1; foo2; };" > %t.list
> +# RUN: ld.lld --version-script %t.script --dynamic-list %t.list %t.o %t2.so -o %t
> +# RUN: llvm-readobj -dyn-symbols %t | FileCheck --check-prefix=EXE %s
> +
> +# DSO: DynamicSymbols [
> +# DSO-NEXT: Symbol {
> +# DSO-NEXT: Name: @ (0)
> +# DSO-NEXT: Value: 0x0
> +# DSO-NEXT: Size: 0
> +# DSO-NEXT: Binding: Local (0x0)
> +# DSO-NEXT: Type: None (0x0)
> +# DSO-NEXT: Other: 0
> +# DSO-NEXT: Section: Undefined (0x0)
> +# DSO-NEXT: }
> +# DSO-NEXT: Symbol {
> +# DSO-NEXT: Name: bar@ (1)
> +# DSO-NEXT: Value: 0x0
> +# DSO-NEXT: Size: 0
> +# DSO-NEXT: Binding: Global (0x1)
> +# DSO-NEXT: Type: Function (0x2)
> +# DSO-NEXT: Other: 0
> +# DSO-NEXT: Section: Undefined (0x0)
> +# DSO-NEXT: }
> +# DSO-NEXT: Symbol {
> +# DSO-NEXT: Name: foo1@ (5)
> +# DSO-NEXT: Value: 0x1000
> +# DSO-NEXT: Size: 0
> +# DSO-NEXT: Binding: Global (0x1)
> +# DSO-NEXT: Type: None (0x0)
> +# DSO-NEXT: Other: 0
> +# DSO-NEXT: Section: .text (0x5)
> +# DSO-NEXT: }
> +# DSO-NEXT: Symbol {
> +# DSO-NEXT: Name: foo3@ (10)
> +# DSO-NEXT: Value: 0x1007
> +# DSO-NEXT: Size: 0
> +# DSO-NEXT: Binding: Global (0x1)
> +# DSO-NEXT: Type: None (0x0)
> +# DSO-NEXT: Other: 0
> +# DSO-NEXT: Section: .text (0x5)
> +# DSO-NEXT: }
> +# DSO-NEXT: ]
> +
> +# DSO2: DynamicSymbols [
> +# DSO2-NEXT: Symbol {
> +# DSO2-NEXT: Name: @ (0)
> +# DSO2-NEXT: Value: 0x0
> +# DSO2-NEXT: Size: 0
> +# DSO2-NEXT: Binding: Local (0x0)
> +# DSO2-NEXT: Type: None (0x0)
> +# DSO2-NEXT: Other: 0
> +# DSO2-NEXT: Section: Undefined (0x0)
> +# DSO2-NEXT: }
> +# DSO2-NEXT: Symbol {
> +# DSO2-NEXT: Name: bar@ (1)
> +# DSO2-NEXT: Value: 0x0
> +# DSO2-NEXT: Size: 0
> +# DSO2-NEXT: Binding: Global (0x1)
> +# DSO2-NEXT: Type: Function (0x2)
> +# DSO2-NEXT: Other: 0
> +# DSO2-NEXT: Section: Undefined (0x0)
> +# DSO2-NEXT: }
> +# DSO2-NEXT: ]
> +
> +# EXE: DynamicSymbols [
> +# EXE-NEXT: Symbol {
> +# EXE-NEXT: Name: @ (0)
> +# EXE-NEXT: Value: 0x0
> +# EXE-NEXT: Size: 0
> +# EXE-NEXT: Binding: Local (0x0)
> +# EXE-NEXT: Type: None (0x0)
> +# EXE-NEXT: Other: 0
> +# EXE-NEXT: Section: Undefined (0x0)
> +# EXE-NEXT: }
> +# EXE-NEXT: Symbol {
> +# EXE-NEXT: Name: bar@ (1)
> +# EXE-NEXT: Value: 0x0
> +# EXE-NEXT: Size: 0
> +# EXE-NEXT: Binding: Global (0x1)
> +# EXE-NEXT: Type: Function (0x2)
> +# EXE-NEXT: Other: 0
> +# EXE-NEXT: Section: Undefined (0x0)
> +# EXE-NEXT: }
> +# EXE-NEXT: Symbol {
> +# EXE-NEXT: Name: foo1@ (5)
> +# EXE-NEXT: Value: 0x11000
> +# EXE-NEXT: Size: 0
> +# EXE-NEXT: Binding: Global (0x1)
> +# EXE-NEXT: Type: None (0x0)
> +# EXE-NEXT: Other: 0
> +# EXE-NEXT: Section: .text (0x5)
> +# EXE-NEXT: }
> +# EXE-NEXT: ]
> +
> +.globl foo1
> +foo1:
> + call bar at PLT
> + ret
> +
> +.globl foo2
> +foo2:
> + ret
> +
> +.globl foo3
> +foo3:
> + call foo2 at PLT
> + ret
> +
> +.globl _start
> +_start:
> + ret
>
>
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