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-rw-r--r--COFF/InputFiles.cpp179
1 files changed, 102 insertions, 77 deletions
diff --git a/COFF/InputFiles.cpp b/COFF/InputFiles.cpp
index ff26826371fa..0a97c2185f89 100644
--- a/COFF/InputFiles.cpp
+++ b/COFF/InputFiles.cpp
@@ -7,11 +7,15 @@
//
//===----------------------------------------------------------------------===//
+#include "InputFiles.h"
#include "Chunks.h"
#include "Config.h"
+#include "Driver.h"
#include "Error.h"
-#include "InputFiles.h"
+#include "Memory.h"
+#include "SymbolTable.h"
#include "Symbols.h"
+#include "llvm-c/lto.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
@@ -26,88 +30,58 @@
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Target/TargetOptions.h"
-#include "llvm-c/lto.h"
#include <cstring>
#include <system_error>
#include <utility>
+using namespace llvm;
using namespace llvm::COFF;
using namespace llvm::object;
using namespace llvm::support::endian;
using llvm::Triple;
using llvm::support::ulittle32_t;
+using llvm::sys::fs::file_magic;
+using llvm::sys::fs::identify_magic;
namespace lld {
namespace coff {
-int InputFile::NextIndex = 0;
-llvm::LLVMContext BitcodeFile::Context;
-
-// Returns the last element of a path, which is supposed to be a filename.
-static StringRef getBasename(StringRef Path) {
- size_t Pos = Path.find_last_of("\\/");
- if (Pos == StringRef::npos)
- return Path;
- return Path.substr(Pos + 1);
-}
+LLVMContext BitcodeFile::Context;
-// Returns a string in the format of "foo.obj" or "foo.obj(bar.lib)".
-std::string InputFile::getShortName() {
- if (ParentName == "")
- return getName().lower();
- std::string Res = (getBasename(ParentName) + "(" +
- getBasename(getName()) + ")").str();
- return StringRef(Res).lower();
-}
+ArchiveFile::ArchiveFile(MemoryBufferRef M) : InputFile(ArchiveKind, M) {}
void ArchiveFile::parse() {
// Parse a MemoryBufferRef as an archive file.
- File = check(Archive::create(MB), "failed to parse static library");
-
- // Allocate a buffer for Lazy objects.
- size_t NumSyms = File->getNumberOfSymbols();
- LazySymbols.reserve(NumSyms);
+ File = check(Archive::create(MB), toString(this));
// Read the symbol table to construct Lazy objects.
for (const Archive::Symbol &Sym : File->symbols())
- LazySymbols.emplace_back(this, Sym);
-
- // Seen is a map from member files to boolean values. Initially
- // all members are mapped to false, which indicates all these files
- // are not read yet.
- Error Err;
- for (auto &Child : File->children(Err))
- Seen[Child.getChildOffset()].clear();
- if (Err)
- fatal(Err, "failed to parse static library");
+ Symtab->addLazy(this, Sym);
}
// Returns a buffer pointing to a member file containing a given symbol.
-// This function is thread-safe.
-MemoryBufferRef ArchiveFile::getMember(const Archive::Symbol *Sym) {
+void ArchiveFile::addMember(const Archive::Symbol *Sym) {
const Archive::Child &C =
check(Sym->getMember(),
"could not get the member for symbol " + Sym->getName());
// Return an empty buffer if we have already returned the same buffer.
- if (Seen[C.getChildOffset()].test_and_set())
- return MemoryBufferRef();
- return check(C.getMemoryBufferRef(),
- "could not get the buffer for the member defining symbol " +
- Sym->getName());
+ if (!Seen.insert(C.getChildOffset()).second)
+ return;
+
+ Driver->enqueueArchiveMember(C, Sym->getName(), getName());
}
void ObjectFile::parse() {
// Parse a memory buffer as a COFF file.
- std::unique_ptr<Binary> Bin =
- check(createBinary(MB), "failed to parse object file");
+ std::unique_ptr<Binary> Bin = check(createBinary(MB), toString(this));
if (auto *Obj = dyn_cast<COFFObjectFile>(Bin.get())) {
Bin.release();
COFFObj.reset(Obj);
} else {
- fatal(getName() + " is not a COFF file");
+ fatal(toString(this) + " is not a COFF file");
}
// Read section and symbol tables.
@@ -137,13 +111,28 @@ void ObjectFile::initializeChunks() {
Directives = std::string((const char *)Data.data(), Data.size());
continue;
}
- // Skip non-DWARF debug info. MSVC linker converts the sections into
- // a PDB file, but we don't support that.
- if (Name == ".debug" || Name.startswith(".debug$"))
- continue;
- // We want to preserve DWARF debug sections only when /debug is on.
+
+ // Object files may have DWARF debug info or MS CodeView debug info
+ // (or both).
+ //
+ // DWARF sections don't need any special handling from the perspective
+ // of the linker; they are just a data section containing relocations.
+ // We can just link them to complete debug info.
+ //
+ // CodeView needs a linker support. We need to interpret and debug
+ // info, and then write it to a separate .pdb file.
+
+ // Ignore debug info unless /debug is given.
if (!Config->Debug && Name.startswith(".debug"))
continue;
+
+ // CodeView sections are stored to a different vector because they are
+ // not linked in the regular manner.
+ if (Name == ".debug" || Name.startswith(".debug$")) {
+ DebugChunks.push_back(new (Alloc) SectionChunk(this, Sec));
+ continue;
+ }
+
if (Sec->Characteristics & llvm::COFF::IMAGE_SCN_LNK_REMOVE)
continue;
auto *C = new (Alloc) SectionChunk(this, Sec);
@@ -156,12 +145,14 @@ void ObjectFile::initializeSymbols() {
uint32_t NumSymbols = COFFObj->getNumberOfSymbols();
SymbolBodies.reserve(NumSymbols);
SparseSymbolBodies.resize(NumSymbols);
- llvm::SmallVector<std::pair<Undefined *, uint32_t>, 8> WeakAliases;
+ SmallVector<std::pair<SymbolBody *, uint32_t>, 8> WeakAliases;
int32_t LastSectionNumber = 0;
for (uint32_t I = 0; I < NumSymbols; ++I) {
// Get a COFFSymbolRef object.
- COFFSymbolRef Sym =
- check(COFFObj->getSymbol(I), "broken object file: " + getName());
+ ErrorOr<COFFSymbolRef> SymOrErr = COFFObj->getSymbol(I);
+ if (!SymOrErr)
+ fatal(SymOrErr.getError(), "broken object file: " + toString(this));
+ COFFSymbolRef Sym = *SymOrErr;
const void *AuxP = nullptr;
if (Sym.getNumberOfAuxSymbols())
@@ -175,7 +166,7 @@ void ObjectFile::initializeSymbols() {
Body = createUndefined(Sym);
uint32_t TagIndex =
static_cast<const coff_aux_weak_external *>(AuxP)->TagIndex;
- WeakAliases.emplace_back((Undefined *)Body, TagIndex);
+ WeakAliases.emplace_back(Body, TagIndex);
} else {
Body = createDefined(Sym, AuxP, IsFirst);
}
@@ -186,23 +177,30 @@ void ObjectFile::initializeSymbols() {
I += Sym.getNumberOfAuxSymbols();
LastSectionNumber = Sym.getSectionNumber();
}
- for (auto WeakAlias : WeakAliases)
- WeakAlias.first->WeakAlias = SparseSymbolBodies[WeakAlias.second];
+ for (auto WeakAlias : WeakAliases) {
+ auto *U = dyn_cast<Undefined>(WeakAlias.first);
+ if (!U)
+ continue;
+ // Report an error if two undefined symbols have different weak aliases.
+ if (U->WeakAlias && U->WeakAlias != SparseSymbolBodies[WeakAlias.second])
+ Symtab->reportDuplicate(U->symbol(), this);
+ U->WeakAlias = SparseSymbolBodies[WeakAlias.second];
+ }
}
-Undefined *ObjectFile::createUndefined(COFFSymbolRef Sym) {
+SymbolBody *ObjectFile::createUndefined(COFFSymbolRef Sym) {
StringRef Name;
COFFObj->getSymbolName(Sym, Name);
- return new (Alloc) Undefined(Name);
+ return Symtab->addUndefined(Name, this, Sym.isWeakExternal())->body();
}
-Defined *ObjectFile::createDefined(COFFSymbolRef Sym, const void *AuxP,
- bool IsFirst) {
+SymbolBody *ObjectFile::createDefined(COFFSymbolRef Sym, const void *AuxP,
+ bool IsFirst) {
StringRef Name;
if (Sym.isCommon()) {
auto *C = new (Alloc) CommonChunk(Sym);
Chunks.push_back(C);
- return new (Alloc) DefinedCommon(this, Sym, C);
+ return Symtab->addCommon(this, Sym, C)->body();
}
if (Sym.isAbsolute()) {
COFFObj->getSymbolName(Sym, Name);
@@ -215,7 +213,10 @@ Defined *ObjectFile::createDefined(COFFSymbolRef Sym, const void *AuxP,
SEHCompat = true;
return nullptr;
}
- return new (Alloc) DefinedAbsolute(Name, Sym);
+ if (Sym.isExternal())
+ return Symtab->addAbsolute(Name, Sym)->body();
+ else
+ return new (Alloc) DefinedAbsolute(Name, Sym);
}
int32_t SectionNumber = Sym.getSectionNumber();
if (SectionNumber == llvm::COFF::IMAGE_SYM_DEBUG)
@@ -223,12 +224,12 @@ Defined *ObjectFile::createDefined(COFFSymbolRef Sym, const void *AuxP,
// Reserved sections numbers don't have contents.
if (llvm::COFF::isReservedSectionNumber(SectionNumber))
- fatal("broken object file: " + getName());
+ fatal("broken object file: " + toString(this));
// This symbol references a section which is not present in the section
// header.
if ((uint32_t)SectionNumber >= SparseChunks.size())
- fatal("broken object file: " + getName());
+ fatal("broken object file: " + toString(this));
// Nothing else to do without a section chunk.
auto *SC = cast_or_null<SectionChunk>(SparseChunks[SectionNumber]);
@@ -245,7 +246,11 @@ Defined *ObjectFile::createDefined(COFFSymbolRef Sym, const void *AuxP,
SC->Checksum = Aux->CheckSum;
}
- auto *B = new (Alloc) DefinedRegular(this, Sym, SC);
+ DefinedRegular *B;
+ if (Sym.isExternal())
+ B = cast<DefinedRegular>(Symtab->addRegular(this, Sym, SC)->body());
+ else
+ B = new (Alloc) DefinedRegular(this, Sym, SC);
if (SC->isCOMDAT() && Sym.getValue() == 0 && !AuxP)
SC->setSymbol(B);
@@ -307,28 +312,29 @@ void ImportFile::parse() {
ExtName = ExtName.substr(0, ExtName.find('@'));
break;
}
- ImpSym = new (Alloc) DefinedImportData(DLLName, ImpName, ExtName, Hdr);
- SymbolBodies.push_back(ImpSym);
+
+ this->Hdr = Hdr;
+ ExternalName = ExtName;
+
+ ImpSym = cast<DefinedImportData>(
+ Symtab->addImportData(ImpName, this)->body());
// If type is function, we need to create a thunk which jump to an
// address pointed by the __imp_ symbol. (This allows you to call
// DLL functions just like regular non-DLL functions.)
if (Hdr->getType() != llvm::COFF::IMPORT_CODE)
return;
- ThunkSym = new (Alloc) DefinedImportThunk(Name, ImpSym, Hdr->Machine);
- SymbolBodies.push_back(ThunkSym);
+ ThunkSym = cast<DefinedImportThunk>(
+ Symtab->addImportThunk(Name, ImpSym, Hdr->Machine)->body());
}
void BitcodeFile::parse() {
- // Usually parse() is thread-safe, but bitcode file is an exception.
- std::lock_guard<std::mutex> Lock(Mu);
-
Context.enableDebugTypeODRUniquing();
ErrorOr<std::unique_ptr<LTOModule>> ModOrErr = LTOModule::createFromBuffer(
Context, MB.getBufferStart(), MB.getBufferSize(), llvm::TargetOptions());
M = check(std::move(ModOrErr), "could not create LTO module");
- llvm::StringSaver Saver(Alloc);
+ StringSaver Saver(Alloc);
for (unsigned I = 0, E = M->getSymbolCount(); I != E; ++I) {
lto_symbol_attributes Attrs = M->getSymbolAttributes(I);
if ((Attrs & LTO_SYMBOL_SCOPE_MASK) == LTO_SYMBOL_SCOPE_INTERNAL)
@@ -337,15 +343,15 @@ void BitcodeFile::parse() {
StringRef SymName = Saver.save(M->getSymbolName(I));
int SymbolDef = Attrs & LTO_SYMBOL_DEFINITION_MASK;
if (SymbolDef == LTO_SYMBOL_DEFINITION_UNDEFINED) {
- SymbolBodies.push_back(new (Alloc) Undefined(SymName));
+ SymbolBodies.push_back(Symtab->addUndefined(SymName, this, false)->body());
} else {
bool Replaceable =
(SymbolDef == LTO_SYMBOL_DEFINITION_TENTATIVE || // common
(Attrs & LTO_SYMBOL_COMDAT) || // comdat
(SymbolDef == LTO_SYMBOL_DEFINITION_WEAK && // weak external
(Attrs & LTO_SYMBOL_ALIAS)));
- SymbolBodies.push_back(new (Alloc) DefinedBitcode(this, SymName,
- Replaceable));
+ SymbolBodies.push_back(
+ Symtab->addBitcode(this, SymName, Replaceable)->body());
}
}
@@ -367,7 +373,26 @@ MachineTypes BitcodeFile::getMachineType() {
}
}
-std::mutex BitcodeFile::Mu;
+// Returns the last element of a path, which is supposed to be a filename.
+static StringRef getBasename(StringRef Path) {
+ size_t Pos = Path.find_last_of("\\/");
+ if (Pos == StringRef::npos)
+ return Path;
+ return Path.substr(Pos + 1);
+}
+
+// Returns a string in the format of "foo.obj" or "foo.obj(bar.lib)".
+std::string toString(InputFile *File) {
+ if (!File)
+ return "(internal)";
+ if (File->ParentName.empty())
+ return File->getName().lower();
+
+ std::string Res =
+ (getBasename(File->ParentName) + "(" + getBasename(File->getName()) + ")")
+ .str();
+ return StringRef(Res).lower();
+}
} // namespace coff
} // namespace lld
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-18 17:17:04 +0000