forked from OSchip/llvm-project
549 lines
17 KiB
C++
549 lines
17 KiB
C++
//===- DLL.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 defines various types of chunks for the DLL import or export
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// descriptor tables. They are inherently Windows-specific.
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// You need to read Microsoft PE/COFF spec to understand details
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// about the data structures.
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//
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// If you are not particularly interested in linking against Windows
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// DLL, you can skip this file, and you should still be able to
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// understand the rest of the linker.
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//
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//===----------------------------------------------------------------------===//
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#include "Chunks.h"
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#include "DLL.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Path.h"
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::support::endian;
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using namespace llvm::COFF;
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namespace lld {
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namespace coff {
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namespace {
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// Import table
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static int ptrSize() { return Config->is64() ? 8 : 4; }
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// A chunk for the import descriptor table.
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class HintNameChunk : public Chunk {
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public:
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HintNameChunk(StringRef N, uint16_t H) : Name(N), Hint(H) {}
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size_t getSize() const override {
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// Starts with 2 byte Hint field, followed by a null-terminated string,
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// ends with 0 or 1 byte padding.
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return alignTo(Name.size() + 3, 2);
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}
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void writeTo(uint8_t *Buf) const override {
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write16le(Buf + OutputSectionOff, Hint);
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memcpy(Buf + OutputSectionOff + 2, Name.data(), Name.size());
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}
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private:
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StringRef Name;
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uint16_t Hint;
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};
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// A chunk for the import descriptor table.
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class LookupChunk : public Chunk {
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public:
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explicit LookupChunk(Chunk *C) : HintName(C) {}
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size_t getSize() const override { return ptrSize(); }
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void writeTo(uint8_t *Buf) const override {
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write32le(Buf + OutputSectionOff, HintName->getRVA());
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}
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Chunk *HintName;
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};
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// A chunk for the import descriptor table.
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// This chunk represent import-by-ordinal symbols.
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// See Microsoft PE/COFF spec 7.1. Import Header for details.
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class OrdinalOnlyChunk : public Chunk {
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public:
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explicit OrdinalOnlyChunk(uint16_t V) : Ordinal(V) {}
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size_t getSize() const override { return ptrSize(); }
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void writeTo(uint8_t *Buf) const override {
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// An import-by-ordinal slot has MSB 1 to indicate that
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// this is import-by-ordinal (and not import-by-name).
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if (Config->is64()) {
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write64le(Buf + OutputSectionOff, (1ULL << 63) | Ordinal);
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} else {
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write32le(Buf + OutputSectionOff, (1ULL << 31) | Ordinal);
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}
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}
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uint16_t Ordinal;
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};
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// A chunk for the import descriptor table.
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class ImportDirectoryChunk : public Chunk {
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public:
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explicit ImportDirectoryChunk(Chunk *N) : DLLName(N) {}
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size_t getSize() const override { return sizeof(ImportDirectoryTableEntry); }
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void writeTo(uint8_t *Buf) const override {
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auto *E = (coff_import_directory_table_entry *)(Buf + OutputSectionOff);
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E->ImportLookupTableRVA = LookupTab->getRVA();
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E->NameRVA = DLLName->getRVA();
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E->ImportAddressTableRVA = AddressTab->getRVA();
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}
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Chunk *DLLName;
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Chunk *LookupTab;
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Chunk *AddressTab;
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};
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// A chunk representing null terminator in the import table.
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// Contents of this chunk is always null bytes.
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class NullChunk : public Chunk {
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public:
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explicit NullChunk(size_t N) : Size(N) {}
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bool hasData() const override { return false; }
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size_t getSize() const override { return Size; }
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void setAlign(size_t N) { Align = N; }
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private:
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size_t Size;
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};
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static std::vector<std::vector<DefinedImportData *>>
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binImports(const std::vector<DefinedImportData *> &Imports) {
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// Group DLL-imported symbols by DLL name because that's how
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// symbols are layed out in the import descriptor table.
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auto Less = [](const std::string &A, const std::string &B) {
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return Config->DLLOrder[A] < Config->DLLOrder[B];
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};
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std::map<std::string, std::vector<DefinedImportData *>,
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bool(*)(const std::string &, const std::string &)> M(Less);
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for (DefinedImportData *Sym : Imports)
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M[Sym->getDLLName().lower()].push_back(Sym);
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std::vector<std::vector<DefinedImportData *>> V;
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for (auto &KV : M) {
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// Sort symbols by name for each group.
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std::vector<DefinedImportData *> &Syms = KV.second;
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std::sort(Syms.begin(), Syms.end(),
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[](DefinedImportData *A, DefinedImportData *B) {
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return A->getName() < B->getName();
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});
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V.push_back(std::move(Syms));
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}
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return V;
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}
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// Export table
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// See Microsoft PE/COFF spec 4.3 for details.
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// A chunk for the delay import descriptor table etnry.
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class DelayDirectoryChunk : public Chunk {
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public:
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explicit DelayDirectoryChunk(Chunk *N) : DLLName(N) {}
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size_t getSize() const override {
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return sizeof(delay_import_directory_table_entry);
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}
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void writeTo(uint8_t *Buf) const override {
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auto *E = (delay_import_directory_table_entry *)(Buf + OutputSectionOff);
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E->Attributes = 1;
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E->Name = DLLName->getRVA();
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E->ModuleHandle = ModuleHandle->getRVA();
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E->DelayImportAddressTable = AddressTab->getRVA();
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E->DelayImportNameTable = NameTab->getRVA();
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}
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Chunk *DLLName;
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Chunk *ModuleHandle;
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Chunk *AddressTab;
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Chunk *NameTab;
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};
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// Initial contents for delay-loaded functions.
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// This code calls __delayLoadHelper2 function to resolve a symbol
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// and then overwrites its jump table slot with the result
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// for subsequent function calls.
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static const uint8_t ThunkX64[] = {
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0x51, // push rcx
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0x52, // push rdx
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0x41, 0x50, // push r8
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0x41, 0x51, // push r9
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0x48, 0x83, 0xEC, 0x48, // sub rsp, 48h
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0x66, 0x0F, 0x7F, 0x04, 0x24, // movdqa xmmword ptr [rsp], xmm0
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0x66, 0x0F, 0x7F, 0x4C, 0x24, 0x10, // movdqa xmmword ptr [rsp+10h], xmm1
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0x66, 0x0F, 0x7F, 0x54, 0x24, 0x20, // movdqa xmmword ptr [rsp+20h], xmm2
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0x66, 0x0F, 0x7F, 0x5C, 0x24, 0x30, // movdqa xmmword ptr [rsp+30h], xmm3
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0x48, 0x8D, 0x15, 0, 0, 0, 0, // lea rdx, [__imp_<FUNCNAME>]
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0x48, 0x8D, 0x0D, 0, 0, 0, 0, // lea rcx, [___DELAY_IMPORT_...]
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0xE8, 0, 0, 0, 0, // call __delayLoadHelper2
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0x66, 0x0F, 0x6F, 0x04, 0x24, // movdqa xmm0, xmmword ptr [rsp]
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0x66, 0x0F, 0x6F, 0x4C, 0x24, 0x10, // movdqa xmm1, xmmword ptr [rsp+10h]
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0x66, 0x0F, 0x6F, 0x54, 0x24, 0x20, // movdqa xmm2, xmmword ptr [rsp+20h]
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0x66, 0x0F, 0x6F, 0x5C, 0x24, 0x30, // movdqa xmm3, xmmword ptr [rsp+30h]
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0x48, 0x83, 0xC4, 0x48, // add rsp, 48h
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0x41, 0x59, // pop r9
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0x41, 0x58, // pop r8
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0x5A, // pop rdx
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0x59, // pop rcx
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0xFF, 0xE0, // jmp rax
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};
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static const uint8_t ThunkX86[] = {
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0x51, // push ecx
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0x52, // push edx
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0x68, 0, 0, 0, 0, // push offset ___imp__<FUNCNAME>
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0x68, 0, 0, 0, 0, // push offset ___DELAY_IMPORT_DESCRIPTOR_<DLLNAME>_dll
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0xE8, 0, 0, 0, 0, // call ___delayLoadHelper2@8
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0x5A, // pop edx
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0x59, // pop ecx
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0xFF, 0xE0, // jmp eax
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};
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// A chunk for the delay import thunk.
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class ThunkChunkX64 : public Chunk {
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public:
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ThunkChunkX64(Defined *I, Chunk *D, Defined *H)
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: Imp(I), Desc(D), Helper(H) {}
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size_t getSize() const override { return sizeof(ThunkX64); }
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void writeTo(uint8_t *Buf) const override {
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memcpy(Buf + OutputSectionOff, ThunkX64, sizeof(ThunkX64));
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write32le(Buf + OutputSectionOff + 36, Imp->getRVA() - RVA - 40);
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write32le(Buf + OutputSectionOff + 43, Desc->getRVA() - RVA - 47);
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write32le(Buf + OutputSectionOff + 48, Helper->getRVA() - RVA - 52);
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}
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Defined *Imp = nullptr;
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Chunk *Desc = nullptr;
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Defined *Helper = nullptr;
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};
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class ThunkChunkX86 : public Chunk {
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public:
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ThunkChunkX86(Defined *I, Chunk *D, Defined *H)
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: Imp(I), Desc(D), Helper(H) {}
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size_t getSize() const override { return sizeof(ThunkX86); }
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void writeTo(uint8_t *Buf) const override {
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memcpy(Buf + OutputSectionOff, ThunkX86, sizeof(ThunkX86));
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write32le(Buf + OutputSectionOff + 3, Imp->getRVA() + Config->ImageBase);
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write32le(Buf + OutputSectionOff + 8, Desc->getRVA() + Config->ImageBase);
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write32le(Buf + OutputSectionOff + 13, Helper->getRVA() - RVA - 17);
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}
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void getBaserels(std::vector<Baserel> *Res) override {
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Res->emplace_back(RVA + 3);
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Res->emplace_back(RVA + 8);
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}
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Defined *Imp = nullptr;
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Chunk *Desc = nullptr;
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Defined *Helper = nullptr;
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};
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// A chunk for the import descriptor table.
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class DelayAddressChunk : public Chunk {
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public:
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explicit DelayAddressChunk(Chunk *C) : Thunk(C) {}
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size_t getSize() const override { return ptrSize(); }
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void writeTo(uint8_t *Buf) const override {
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if (Config->is64()) {
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write64le(Buf + OutputSectionOff, Thunk->getRVA() + Config->ImageBase);
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} else {
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write32le(Buf + OutputSectionOff, Thunk->getRVA() + Config->ImageBase);
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}
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}
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void getBaserels(std::vector<Baserel> *Res) override {
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Res->emplace_back(RVA);
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}
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Chunk *Thunk;
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};
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// Export table
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// Read Microsoft PE/COFF spec 5.3 for details.
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// A chunk for the export descriptor table.
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class ExportDirectoryChunk : public Chunk {
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public:
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ExportDirectoryChunk(int I, int J, Chunk *D, Chunk *A, Chunk *N, Chunk *O)
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: MaxOrdinal(I), NameTabSize(J), DLLName(D), AddressTab(A), NameTab(N),
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OrdinalTab(O) {}
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size_t getSize() const override {
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return sizeof(export_directory_table_entry);
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}
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void writeTo(uint8_t *Buf) const override {
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auto *E = (export_directory_table_entry *)(Buf + OutputSectionOff);
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E->NameRVA = DLLName->getRVA();
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E->OrdinalBase = 0;
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E->AddressTableEntries = MaxOrdinal + 1;
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E->NumberOfNamePointers = NameTabSize;
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E->ExportAddressTableRVA = AddressTab->getRVA();
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E->NamePointerRVA = NameTab->getRVA();
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E->OrdinalTableRVA = OrdinalTab->getRVA();
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}
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uint16_t MaxOrdinal;
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uint16_t NameTabSize;
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Chunk *DLLName;
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Chunk *AddressTab;
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Chunk *NameTab;
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Chunk *OrdinalTab;
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};
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class AddressTableChunk : public Chunk {
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public:
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explicit AddressTableChunk(size_t MaxOrdinal) : Size(MaxOrdinal + 1) {}
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size_t getSize() const override { return Size * 4; }
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void writeTo(uint8_t *Buf) const override {
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for (Export &E : Config->Exports) {
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uint8_t *P = Buf + OutputSectionOff + E.Ordinal * 4;
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if (E.ForwardChunk) {
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write32le(P, E.ForwardChunk->getRVA());
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} else {
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write32le(P, cast<Defined>(E.Sym)->getRVA());
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}
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}
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}
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private:
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size_t Size;
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};
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class NamePointersChunk : public Chunk {
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public:
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explicit NamePointersChunk(std::vector<Chunk *> &V) : Chunks(V) {}
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size_t getSize() const override { return Chunks.size() * 4; }
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void writeTo(uint8_t *Buf) const override {
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uint8_t *P = Buf + OutputSectionOff;
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for (Chunk *C : Chunks) {
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write32le(P, C->getRVA());
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P += 4;
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}
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}
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private:
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std::vector<Chunk *> Chunks;
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};
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class ExportOrdinalChunk : public Chunk {
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public:
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explicit ExportOrdinalChunk(size_t I) : Size(I) {}
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size_t getSize() const override { return Size * 2; }
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void writeTo(uint8_t *Buf) const override {
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uint8_t *P = Buf + OutputSectionOff;
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for (Export &E : Config->Exports) {
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if (E.Noname)
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continue;
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write16le(P, E.Ordinal);
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P += 2;
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}
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}
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private:
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size_t Size;
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};
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} // anonymous namespace
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uint64_t IdataContents::getDirSize() {
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return Dirs.size() * sizeof(ImportDirectoryTableEntry);
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}
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uint64_t IdataContents::getIATSize() {
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return Addresses.size() * ptrSize();
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}
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// Returns a list of .idata contents.
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// See Microsoft PE/COFF spec 5.4 for details.
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std::vector<Chunk *> IdataContents::getChunks() {
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create();
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// The loader assumes a specific order of data.
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// Add each type in the correct order.
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std::vector<Chunk *> V;
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V.insert(V.end(), Dirs.begin(), Dirs.end());
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V.insert(V.end(), Lookups.begin(), Lookups.end());
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V.insert(V.end(), Addresses.begin(), Addresses.end());
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V.insert(V.end(), Hints.begin(), Hints.end());
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V.insert(V.end(), DLLNames.begin(), DLLNames.end());
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return V;
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}
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void IdataContents::create() {
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std::vector<std::vector<DefinedImportData *>> V = binImports(Imports);
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// Create .idata contents for each DLL.
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for (std::vector<DefinedImportData *> &Syms : V) {
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// Create lookup and address tables. If they have external names,
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// we need to create HintName chunks to store the names.
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// If they don't (if they are import-by-ordinals), we store only
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// ordinal values to the table.
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size_t Base = Lookups.size();
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for (DefinedImportData *S : Syms) {
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uint16_t Ord = S->getOrdinal();
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if (S->getExternalName().empty()) {
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Lookups.push_back(make<OrdinalOnlyChunk>(Ord));
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Addresses.push_back(make<OrdinalOnlyChunk>(Ord));
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continue;
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}
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auto *C = make<HintNameChunk>(S->getExternalName(), Ord);
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Lookups.push_back(make<LookupChunk>(C));
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Addresses.push_back(make<LookupChunk>(C));
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Hints.push_back(C);
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}
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// Terminate with null values.
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Lookups.push_back(make<NullChunk>(ptrSize()));
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Addresses.push_back(make<NullChunk>(ptrSize()));
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for (int I = 0, E = Syms.size(); I < E; ++I)
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Syms[I]->setLocation(Addresses[Base + I]);
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// Create the import table header.
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DLLNames.push_back(make<StringChunk>(Syms[0]->getDLLName()));
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auto *Dir = make<ImportDirectoryChunk>(DLLNames.back());
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Dir->LookupTab = Lookups[Base];
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Dir->AddressTab = Addresses[Base];
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Dirs.push_back(Dir);
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}
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// Add null terminator.
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Dirs.push_back(make<NullChunk>(sizeof(ImportDirectoryTableEntry)));
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}
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std::vector<Chunk *> DelayLoadContents::getChunks() {
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std::vector<Chunk *> V;
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V.insert(V.end(), Dirs.begin(), Dirs.end());
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V.insert(V.end(), Names.begin(), Names.end());
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V.insert(V.end(), HintNames.begin(), HintNames.end());
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V.insert(V.end(), DLLNames.begin(), DLLNames.end());
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return V;
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}
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std::vector<Chunk *> DelayLoadContents::getDataChunks() {
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std::vector<Chunk *> V;
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V.insert(V.end(), ModuleHandles.begin(), ModuleHandles.end());
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V.insert(V.end(), Addresses.begin(), Addresses.end());
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return V;
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}
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uint64_t DelayLoadContents::getDirSize() {
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return Dirs.size() * sizeof(delay_import_directory_table_entry);
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}
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void DelayLoadContents::create(Defined *H) {
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Helper = H;
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std::vector<std::vector<DefinedImportData *>> V = binImports(Imports);
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// Create .didat contents for each DLL.
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for (std::vector<DefinedImportData *> &Syms : V) {
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// Create the delay import table header.
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DLLNames.push_back(make<StringChunk>(Syms[0]->getDLLName()));
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auto *Dir = make<DelayDirectoryChunk>(DLLNames.back());
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size_t Base = Addresses.size();
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for (DefinedImportData *S : Syms) {
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Chunk *T = newThunkChunk(S, Dir);
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auto *A = make<DelayAddressChunk>(T);
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Addresses.push_back(A);
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Thunks.push_back(T);
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StringRef ExtName = S->getExternalName();
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if (ExtName.empty()) {
|
|
Names.push_back(make<OrdinalOnlyChunk>(S->getOrdinal()));
|
|
} else {
|
|
auto *C = make<HintNameChunk>(ExtName, 0);
|
|
Names.push_back(make<LookupChunk>(C));
|
|
HintNames.push_back(C);
|
|
}
|
|
}
|
|
// Terminate with null values.
|
|
Addresses.push_back(make<NullChunk>(8));
|
|
Names.push_back(make<NullChunk>(8));
|
|
|
|
for (int I = 0, E = Syms.size(); I < E; ++I)
|
|
Syms[I]->setLocation(Addresses[Base + I]);
|
|
auto *MH = make<NullChunk>(8);
|
|
MH->setAlign(8);
|
|
ModuleHandles.push_back(MH);
|
|
|
|
// Fill the delay import table header fields.
|
|
Dir->ModuleHandle = MH;
|
|
Dir->AddressTab = Addresses[Base];
|
|
Dir->NameTab = Names[Base];
|
|
Dirs.push_back(Dir);
|
|
}
|
|
// Add null terminator.
|
|
Dirs.push_back(make<NullChunk>(sizeof(delay_import_directory_table_entry)));
|
|
}
|
|
|
|
Chunk *DelayLoadContents::newThunkChunk(DefinedImportData *S, Chunk *Dir) {
|
|
switch (Config->Machine) {
|
|
case AMD64:
|
|
return make<ThunkChunkX64>(S, Dir, Helper);
|
|
case I386:
|
|
return make<ThunkChunkX86>(S, Dir, Helper);
|
|
default:
|
|
llvm_unreachable("unsupported machine type");
|
|
}
|
|
}
|
|
|
|
EdataContents::EdataContents() {
|
|
uint16_t MaxOrdinal = 0;
|
|
for (Export &E : Config->Exports)
|
|
MaxOrdinal = std::max(MaxOrdinal, E.Ordinal);
|
|
|
|
auto *DLLName = make<StringChunk>(sys::path::filename(Config->OutputFile));
|
|
auto *AddressTab = make<AddressTableChunk>(MaxOrdinal);
|
|
std::vector<Chunk *> Names;
|
|
for (Export &E : Config->Exports)
|
|
if (!E.Noname)
|
|
Names.push_back(make<StringChunk>(E.ExportName));
|
|
|
|
std::vector<Chunk *> Forwards;
|
|
for (Export &E : Config->Exports) {
|
|
if (E.ForwardTo.empty())
|
|
continue;
|
|
E.ForwardChunk = make<StringChunk>(E.ForwardTo);
|
|
Forwards.push_back(E.ForwardChunk);
|
|
}
|
|
|
|
auto *NameTab = make<NamePointersChunk>(Names);
|
|
auto *OrdinalTab = make<ExportOrdinalChunk>(Names.size());
|
|
auto *Dir = make<ExportDirectoryChunk>(MaxOrdinal, Names.size(), DLLName,
|
|
AddressTab, NameTab, OrdinalTab);
|
|
Chunks.push_back(Dir);
|
|
Chunks.push_back(DLLName);
|
|
Chunks.push_back(AddressTab);
|
|
Chunks.push_back(NameTab);
|
|
Chunks.push_back(OrdinalTab);
|
|
Chunks.insert(Chunks.end(), Names.begin(), Names.end());
|
|
Chunks.insert(Chunks.end(), Forwards.begin(), Forwards.end());
|
|
}
|
|
|
|
} // namespace coff
|
|
} // namespace lld
|