2015-10-01 01:23:26 +08:00
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//===- LinkerScript.cpp ---------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the parser/evaluator of the linker script.
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// It does not construct an AST but consume linker script directives directly.
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2015-10-14 03:51:57 +08:00
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// Results are written to Driver or Config object.
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2015-10-01 01:23:26 +08:00
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//
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//===----------------------------------------------------------------------===//
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2016-02-12 05:17:59 +08:00
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#include "LinkerScript.h"
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2015-10-01 01:23:26 +08:00
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#include "Config.h"
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#include "Driver.h"
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2016-02-13 05:47:28 +08:00
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#include "InputSection.h"
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2015-10-01 01:23:26 +08:00
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#include "SymbolTable.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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2015-10-13 08:09:21 +08:00
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#include "llvm/Support/Path.h"
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2015-10-11 09:53:04 +08:00
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#include "llvm/Support/StringSaver.h"
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2015-10-01 01:23:26 +08:00
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using namespace llvm;
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2016-02-13 05:47:28 +08:00
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using namespace llvm::object;
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2015-10-01 01:23:26 +08:00
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using namespace lld;
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using namespace lld::elf2;
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2016-02-12 05:17:59 +08:00
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LinkerScript *elf2::Script;
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2016-02-13 05:47:28 +08:00
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template <class ELFT>
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2016-02-23 15:47:54 +08:00
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SectionRule *LinkerScript::find(InputSectionBase<ELFT> *S) {
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2016-02-13 05:47:28 +08:00
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for (SectionRule &R : Sections)
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if (R.match(S))
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2016-02-23 15:47:54 +08:00
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return &R;
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return nullptr;
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}
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template <class ELFT>
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StringRef LinkerScript::getOutputSection(InputSectionBase<ELFT> *S) {
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SectionRule *R = find(S);
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return R ? R->Dest : "";
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2016-02-12 05:17:59 +08:00
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}
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2016-02-13 05:47:28 +08:00
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template <class ELFT>
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bool LinkerScript::isDiscarded(InputSectionBase<ELFT> *S) {
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return getOutputSection(S) == "/DISCARD/";
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2016-02-12 05:17:59 +08:00
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}
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2016-02-23 15:47:54 +08:00
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template <class ELFT> bool LinkerScript::shouldKeep(InputSectionBase<ELFT> *S) {
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SectionRule *R = find(S);
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return R && R->Keep;
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}
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2016-02-13 04:41:43 +08:00
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// A compartor to sort output sections. Returns -1 or 1 if both
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// A and B are mentioned in linker scripts. Otherwise, returns 0
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// to use the default rule which is implemented in Writer.cpp.
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2016-02-12 05:17:59 +08:00
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int LinkerScript::compareSections(StringRef A, StringRef B) {
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2016-02-13 04:41:43 +08:00
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auto E = SectionOrder.end();
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auto I = std::find(SectionOrder.begin(), E, A);
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auto J = std::find(SectionOrder.begin(), E, B);
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if (I == E || J == E)
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2016-02-12 05:17:59 +08:00
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return 0;
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return I < J ? -1 : 1;
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}
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2016-02-24 16:49:50 +08:00
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// Returns true if S matches T. S can contain glob meta-characters.
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// The asterisk ('*') matches zero or more characacters, and the question
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// mark ('?') matches one character.
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2016-02-13 05:47:28 +08:00
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static bool matchStr(StringRef S, StringRef T) {
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for (;;) {
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if (S.empty())
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return T.empty();
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if (S[0] == '*') {
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S = S.substr(1);
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if (S.empty())
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// Fast path. If a pattern is '*', it matches anything.
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return true;
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for (size_t I = 0, E = T.size(); I < E; ++I)
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if (matchStr(S, T.substr(I)))
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return true;
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return false;
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}
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2016-02-24 16:49:50 +08:00
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if (T.empty() || (S[0] != T[0] && S[0] != '?'))
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2016-02-13 05:47:28 +08:00
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return false;
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S = S.substr(1);
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T = T.substr(1);
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}
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}
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template <class ELFT> bool SectionRule::match(InputSectionBase<ELFT> *S) {
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return matchStr(SectionPattern, S->getSectionName());
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}
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2016-02-12 05:17:59 +08:00
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class elf2::ScriptParser {
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2015-10-01 01:23:26 +08:00
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public:
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2016-02-12 05:17:59 +08:00
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ScriptParser(BumpPtrAllocator *A, StringRef S, bool B)
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2016-02-19 18:45:45 +08:00
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: Saver(*A), Tokens(tokenize(S)), IsUnderSysroot(B) {
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2016-02-19 19:56:49 +08:00
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Cmd["ENTRY"] = std::mem_fn(&ScriptParser::readEntry);
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Cmd["EXTERN"] = std::mem_fn(&ScriptParser::readExtern);
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Cmd["GROUP"] = std::mem_fn(&ScriptParser::readGroup);
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Cmd["INCLUDE"] = std::mem_fn(&ScriptParser::readInclude);
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Cmd["INPUT"] = std::mem_fn(&ScriptParser::readGroup);
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Cmd["OUTPUT"] = std::mem_fn(&ScriptParser::readOutput);
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Cmd["OUTPUT_ARCH"] = std::mem_fn(&ScriptParser::readOutputArch);
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Cmd["OUTPUT_FORMAT"] = std::mem_fn(&ScriptParser::readOutputFormat);
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Cmd["SEARCH_DIR"] = std::mem_fn(&ScriptParser::readSearchDir);
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Cmd["SECTIONS"] = std::mem_fn(&ScriptParser::readSections);
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2016-02-19 18:45:45 +08:00
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Cmd[";"] = [](ScriptParser &) {};
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}
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2015-10-01 01:23:26 +08:00
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void run();
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private:
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2016-02-03 04:27:59 +08:00
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void setError(const Twine &Msg);
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2015-10-01 01:23:26 +08:00
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static std::vector<StringRef> tokenize(StringRef S);
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static StringRef skipSpace(StringRef S);
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2016-02-03 04:27:59 +08:00
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bool atEOF();
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2015-10-01 01:23:26 +08:00
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StringRef next();
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2015-11-12 17:52:08 +08:00
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bool skip(StringRef Tok);
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2015-10-01 01:23:26 +08:00
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void expect(StringRef Expect);
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2015-10-11 11:28:42 +08:00
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void addFile(StringRef Path);
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2015-10-01 01:23:26 +08:00
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void readAsNeeded();
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2015-10-08 14:48:38 +08:00
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void readEntry();
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2015-10-20 01:35:12 +08:00
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void readExtern();
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2015-10-01 01:23:26 +08:00
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void readGroup();
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2015-10-11 09:31:55 +08:00
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void readInclude();
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2015-10-07 08:25:09 +08:00
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void readOutput();
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2015-10-13 05:50:08 +08:00
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void readOutputArch();
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2015-10-01 01:23:26 +08:00
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void readOutputFormat();
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2015-10-09 01:51:41 +08:00
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void readSearchDir();
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2015-11-12 17:52:08 +08:00
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void readSections();
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void readOutputSectionDescription();
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2016-02-23 15:47:54 +08:00
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void readSectionPatterns(StringRef OutSec, bool Keep);
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2015-10-01 01:23:26 +08:00
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2015-10-11 09:53:04 +08:00
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StringSaver Saver;
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2015-10-01 01:23:26 +08:00
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std::vector<StringRef> Tokens;
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2016-02-19 18:45:45 +08:00
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llvm::StringMap<std::function<void(ScriptParser &)>> Cmd;
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2015-10-01 01:23:26 +08:00
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size_t Pos = 0;
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2015-11-26 13:53:00 +08:00
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bool IsUnderSysroot;
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2016-02-19 18:45:45 +08:00
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bool Error = false;
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2015-10-01 01:23:26 +08:00
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};
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2016-02-12 05:17:59 +08:00
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void ScriptParser::run() {
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2015-10-01 01:23:26 +08:00
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while (!atEOF()) {
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StringRef Tok = next();
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2016-02-19 18:45:45 +08:00
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auto It = Cmd.find(Tok);
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if (It != Cmd.end()) {
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std::function<void(ScriptParser &)> &Handler = It->second;
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Handler(*this);
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2015-10-01 01:23:26 +08:00
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} else {
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2016-02-03 04:27:59 +08:00
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setError("unknown directive: " + Tok);
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2015-10-01 01:23:26 +08:00
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}
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}
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}
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2016-02-03 04:27:59 +08:00
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// We don't want to record cascading errors. Keep only the first one.
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2016-02-12 05:17:59 +08:00
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void ScriptParser::setError(const Twine &Msg) {
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2016-02-03 04:27:59 +08:00
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if (Error)
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return;
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error(Msg);
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Error = true;
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}
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2015-10-01 01:23:26 +08:00
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// Split S into linker script tokens.
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2016-02-12 05:17:59 +08:00
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std::vector<StringRef> ScriptParser::tokenize(StringRef S) {
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2015-10-01 01:23:26 +08:00
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std::vector<StringRef> Ret;
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for (;;) {
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S = skipSpace(S);
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if (S.empty())
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return Ret;
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// Quoted token
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if (S.startswith("\"")) {
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size_t E = S.find("\"", 1);
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2016-02-03 04:27:59 +08:00
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if (E == StringRef::npos) {
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error("unclosed quote");
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return {};
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}
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2016-01-23 07:46:37 +08:00
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Ret.push_back(S.substr(1, E - 1));
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2015-10-01 01:23:26 +08:00
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S = S.substr(E + 1);
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continue;
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}
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// Unquoted token
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size_t Pos = S.find_first_not_of(
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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"0123456789_.$/\\~=+[]*?-:");
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// A character that cannot start a word (which is usually a
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// punctuation) forms a single character token.
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if (Pos == 0)
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Pos = 1;
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Ret.push_back(S.substr(0, Pos));
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S = S.substr(Pos);
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}
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}
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// Skip leading whitespace characters or /**/-style comments.
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2016-02-12 05:17:59 +08:00
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StringRef ScriptParser::skipSpace(StringRef S) {
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2015-10-01 01:23:26 +08:00
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for (;;) {
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if (S.startswith("/*")) {
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size_t E = S.find("*/", 2);
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2016-02-03 04:27:59 +08:00
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if (E == StringRef::npos) {
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error("unclosed comment in a linker script");
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return "";
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}
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2015-10-01 01:23:26 +08:00
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S = S.substr(E + 2);
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continue;
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}
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size_t Size = S.size();
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S = S.ltrim();
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if (S.size() == Size)
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return S;
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}
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}
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2016-02-03 04:27:59 +08:00
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// An errneous token is handled as if it were the last token before EOF.
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2016-02-12 05:17:59 +08:00
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bool ScriptParser::atEOF() { return Error || Tokens.size() == Pos; }
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2016-02-03 04:27:59 +08:00
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2016-02-12 05:17:59 +08:00
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StringRef ScriptParser::next() {
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2016-02-03 04:27:59 +08:00
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if (Error)
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return "";
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if (atEOF()) {
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setError("unexpected EOF");
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return "";
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}
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2015-10-01 01:23:26 +08:00
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return Tokens[Pos++];
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}
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2016-02-12 05:17:59 +08:00
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bool ScriptParser::skip(StringRef Tok) {
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2016-02-03 04:27:59 +08:00
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if (Error)
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return false;
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if (atEOF()) {
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setError("unexpected EOF");
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return false;
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}
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2015-11-12 17:52:08 +08:00
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if (Tok != Tokens[Pos])
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return false;
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++Pos;
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return true;
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}
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2016-02-12 05:17:59 +08:00
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void ScriptParser::expect(StringRef Expect) {
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2016-02-03 04:27:59 +08:00
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if (Error)
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return;
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2015-10-01 01:23:26 +08:00
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StringRef Tok = next();
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if (Tok != Expect)
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2016-02-03 04:27:59 +08:00
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setError(Expect + " expected, but got " + Tok);
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2015-10-01 01:23:26 +08:00
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}
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2016-02-12 05:17:59 +08:00
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void ScriptParser::addFile(StringRef S) {
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2015-11-26 13:53:00 +08:00
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if (IsUnderSysroot && S.startswith("/")) {
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SmallString<128> Path;
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(Config->Sysroot + S).toStringRef(Path);
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if (sys::fs::exists(Path)) {
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Driver->addFile(Saver.save(Path.str()));
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return;
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}
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}
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2015-10-13 08:09:21 +08:00
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if (sys::path::is_absolute(S)) {
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2015-10-11 11:28:42 +08:00
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Driver->addFile(S);
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} else if (S.startswith("=")) {
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if (Config->Sysroot.empty())
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Driver->addFile(S.substr(1));
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else
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Driver->addFile(Saver.save(Config->Sysroot + "/" + S.substr(1)));
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} else if (S.startswith("-l")) {
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2016-02-03 05:13:09 +08:00
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Driver->addLibrary(S.substr(2));
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2015-11-27 04:23:46 +08:00
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} else if (sys::fs::exists(S)) {
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Driver->addFile(S);
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2015-10-11 11:28:42 +08:00
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} else {
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std::string Path = findFromSearchPaths(S);
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if (Path.empty())
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2016-02-03 04:27:59 +08:00
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setError("Unable to find " + S);
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else
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Driver->addFile(Saver.save(Path));
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2015-10-11 11:28:42 +08:00
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}
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}
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2016-02-12 05:17:59 +08:00
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void ScriptParser::readAsNeeded() {
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2015-10-01 01:23:26 +08:00
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expect("(");
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2015-10-12 04:59:12 +08:00
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bool Orig = Config->AsNeeded;
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Config->AsNeeded = true;
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2016-02-03 04:27:59 +08:00
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while (!Error) {
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2015-10-01 01:23:26 +08:00
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StringRef Tok = next();
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if (Tok == ")")
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2015-10-12 04:59:12 +08:00
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break;
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2015-10-11 11:28:42 +08:00
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addFile(Tok);
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2015-10-01 01:23:26 +08:00
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}
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2015-10-12 04:59:12 +08:00
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Config->AsNeeded = Orig;
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2015-10-01 01:23:26 +08:00
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}
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2016-02-12 05:17:59 +08:00
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void ScriptParser::readEntry() {
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2015-10-08 14:48:38 +08:00
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|
|
// -e <symbol> takes predecence over ENTRY(<symbol>).
|
|
|
|
expect("(");
|
|
|
|
StringRef Tok = next();
|
|
|
|
if (Config->Entry.empty())
|
|
|
|
Config->Entry = Tok;
|
|
|
|
expect(")");
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readExtern() {
|
2015-10-20 01:35:12 +08:00
|
|
|
expect("(");
|
2016-02-03 04:27:59 +08:00
|
|
|
while (!Error) {
|
2015-10-20 01:35:12 +08:00
|
|
|
StringRef Tok = next();
|
|
|
|
if (Tok == ")")
|
|
|
|
return;
|
|
|
|
Config->Undefined.push_back(Tok);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readGroup() {
|
2015-10-01 01:23:26 +08:00
|
|
|
expect("(");
|
2016-02-03 04:27:59 +08:00
|
|
|
while (!Error) {
|
2015-10-01 01:23:26 +08:00
|
|
|
StringRef Tok = next();
|
|
|
|
if (Tok == ")")
|
|
|
|
return;
|
|
|
|
if (Tok == "AS_NEEDED") {
|
|
|
|
readAsNeeded();
|
|
|
|
continue;
|
|
|
|
}
|
2015-10-11 11:28:42 +08:00
|
|
|
addFile(Tok);
|
2015-10-01 01:23:26 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readInclude() {
|
2015-10-11 09:31:55 +08:00
|
|
|
StringRef Tok = next();
|
|
|
|
auto MBOrErr = MemoryBuffer::getFile(Tok);
|
2016-02-03 04:27:59 +08:00
|
|
|
if (!MBOrErr) {
|
|
|
|
setError("cannot open " + Tok);
|
|
|
|
return;
|
|
|
|
}
|
2015-10-11 09:31:55 +08:00
|
|
|
std::unique_ptr<MemoryBuffer> &MB = *MBOrErr;
|
2015-10-11 09:53:04 +08:00
|
|
|
StringRef S = Saver.save(MB->getMemBufferRef().getBuffer());
|
|
|
|
std::vector<StringRef> V = tokenize(S);
|
2015-10-11 09:31:55 +08:00
|
|
|
Tokens.insert(Tokens.begin() + Pos, V.begin(), V.end());
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readOutput() {
|
2015-10-07 08:25:09 +08:00
|
|
|
// -o <file> takes predecence over OUTPUT(<file>).
|
|
|
|
expect("(");
|
|
|
|
StringRef Tok = next();
|
|
|
|
if (Config->OutputFile.empty())
|
|
|
|
Config->OutputFile = Tok;
|
|
|
|
expect(")");
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readOutputArch() {
|
2015-10-13 05:50:08 +08:00
|
|
|
// Error checking only for now.
|
|
|
|
expect("(");
|
|
|
|
next();
|
|
|
|
expect(")");
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readOutputFormat() {
|
2015-10-01 01:23:26 +08:00
|
|
|
// Error checking only for now.
|
|
|
|
expect("(");
|
|
|
|
next();
|
2015-10-13 05:08:41 +08:00
|
|
|
StringRef Tok = next();
|
|
|
|
if (Tok == ")")
|
|
|
|
return;
|
2016-02-03 04:27:59 +08:00
|
|
|
if (Tok != ",") {
|
|
|
|
setError("unexpected token: " + Tok);
|
|
|
|
return;
|
|
|
|
}
|
2015-10-13 05:08:41 +08:00
|
|
|
next();
|
|
|
|
expect(",");
|
|
|
|
next();
|
2015-10-01 01:23:26 +08:00
|
|
|
expect(")");
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readSearchDir() {
|
2015-10-09 01:51:41 +08:00
|
|
|
expect("(");
|
2015-10-11 11:28:42 +08:00
|
|
|
Config->SearchPaths.push_back(next());
|
2015-10-09 01:51:41 +08:00
|
|
|
expect(")");
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readSections() {
|
2015-11-12 17:52:08 +08:00
|
|
|
expect("{");
|
2016-02-03 04:27:59 +08:00
|
|
|
while (!Error && !skip("}"))
|
2015-11-12 17:52:08 +08:00
|
|
|
readOutputSectionDescription();
|
|
|
|
}
|
|
|
|
|
2016-02-23 15:47:54 +08:00
|
|
|
void ScriptParser::readSectionPatterns(StringRef OutSec, bool Keep) {
|
|
|
|
expect("(");
|
|
|
|
while (!Error && !skip(")"))
|
|
|
|
Script->Sections.emplace_back(OutSec, next(), Keep);
|
|
|
|
}
|
|
|
|
|
2016-02-12 05:17:59 +08:00
|
|
|
void ScriptParser::readOutputSectionDescription() {
|
2016-02-13 04:41:43 +08:00
|
|
|
StringRef OutSec = next();
|
|
|
|
Script->SectionOrder.push_back(OutSec);
|
2015-11-12 17:52:08 +08:00
|
|
|
expect(":");
|
|
|
|
expect("{");
|
2016-02-03 04:27:59 +08:00
|
|
|
while (!Error && !skip("}")) {
|
2016-02-23 15:47:54 +08:00
|
|
|
StringRef Tok = next();
|
|
|
|
if (Tok == "*") {
|
|
|
|
readSectionPatterns(OutSec, false);
|
|
|
|
} else if (Tok == "KEEP") {
|
|
|
|
expect("(");
|
|
|
|
next(); // Skip *
|
|
|
|
readSectionPatterns(OutSec, true);
|
|
|
|
expect(")");
|
|
|
|
} else {
|
|
|
|
setError("Unknown command " + Tok);
|
|
|
|
}
|
2015-11-12 17:52:08 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-11-26 13:53:00 +08:00
|
|
|
static bool isUnderSysroot(StringRef Path) {
|
|
|
|
if (Config->Sysroot == "")
|
|
|
|
return false;
|
|
|
|
for (; !Path.empty(); Path = sys::path::parent_path(Path))
|
|
|
|
if (sys::fs::equivalent(Config->Sysroot, Path))
|
|
|
|
return true;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2015-10-01 01:23:26 +08:00
|
|
|
// Entry point. The other functions or classes are private to this file.
|
2016-02-12 05:38:55 +08:00
|
|
|
void LinkerScript::read(MemoryBufferRef MB) {
|
2015-11-26 13:53:00 +08:00
|
|
|
StringRef Path = MB.getBufferIdentifier();
|
2016-02-12 05:38:55 +08:00
|
|
|
ScriptParser(&Alloc, MB.getBuffer(), isUnderSysroot(Path)).run();
|
2015-10-01 01:23:26 +08:00
|
|
|
}
|
2016-02-13 05:47:28 +08:00
|
|
|
|
|
|
|
template StringRef LinkerScript::getOutputSection(InputSectionBase<ELF32LE> *);
|
|
|
|
template StringRef LinkerScript::getOutputSection(InputSectionBase<ELF32BE> *);
|
|
|
|
template StringRef LinkerScript::getOutputSection(InputSectionBase<ELF64LE> *);
|
|
|
|
template StringRef LinkerScript::getOutputSection(InputSectionBase<ELF64BE> *);
|
|
|
|
|
|
|
|
template bool LinkerScript::isDiscarded(InputSectionBase<ELF32LE> *);
|
|
|
|
template bool LinkerScript::isDiscarded(InputSectionBase<ELF32BE> *);
|
|
|
|
template bool LinkerScript::isDiscarded(InputSectionBase<ELF64LE> *);
|
|
|
|
template bool LinkerScript::isDiscarded(InputSectionBase<ELF64BE> *);
|
|
|
|
|
2016-02-23 15:47:54 +08:00
|
|
|
template bool LinkerScript::shouldKeep(InputSectionBase<ELF32LE> *);
|
|
|
|
template bool LinkerScript::shouldKeep(InputSectionBase<ELF32BE> *);
|
|
|
|
template bool LinkerScript::shouldKeep(InputSectionBase<ELF64LE> *);
|
|
|
|
template bool LinkerScript::shouldKeep(InputSectionBase<ELF64BE> *);
|
|
|
|
|
2016-02-13 05:47:28 +08:00
|
|
|
template bool SectionRule::match(InputSectionBase<ELF32LE> *);
|
|
|
|
template bool SectionRule::match(InputSectionBase<ELF32BE> *);
|
|
|
|
template bool SectionRule::match(InputSectionBase<ELF64LE> *);
|
|
|
|
template bool SectionRule::match(InputSectionBase<ELF64BE> *);
|