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llvm-project/lld/COFF/DLL.cpp

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//===- DLL.cpp ------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines various types of chunks for the DLL import or export
// descriptor tables. They are inherently Windows-specific.
// You need to read Microsoft PE/COFF spec to understand details
// about the data structures.
//
// If you are not particularly interested in linking against Windows
// DLL, you can skip this file, and you should still be able to
// understand the rest of the linker.
//
//===----------------------------------------------------------------------===//
#include "DLL.h"
#include "COFFLinkerContext.h"
#include "Chunks.h"
#include "SymbolTable.h"
#include "llvm/Object/COFF.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Path.h"
using namespace llvm;
using namespace llvm::object;
using namespace llvm::support::endian;
using namespace llvm::COFF;
namespace lld {
namespace coff {
namespace {
// Import table
// A chunk for the import descriptor table.
class HintNameChunk : public NonSectionChunk {
public:
HintNameChunk(StringRef n, uint16_t h) : name(n), hint(h) {}
size_t getSize() const override {
// Starts with 2 byte Hint field, followed by a null-terminated string,
// ends with 0 or 1 byte padding.
return alignTo(name.size() + 3, 2);
}
void writeTo(uint8_t *buf) const override {
memset(buf, 0, getSize());
write16le(buf, hint);
memcpy(buf + 2, name.data(), name.size());
}
private:
StringRef name;
uint16_t hint;
};
// A chunk for the import descriptor table.
class LookupChunk : public NonSectionChunk {
public:
explicit LookupChunk(Chunk *c) : hintName(c) {
setAlignment(config->wordsize);
}
size_t getSize() const override { return config->wordsize; }
void writeTo(uint8_t *buf) const override {
if (config->is64())
write64le(buf, hintName->getRVA());
else
write32le(buf, hintName->getRVA());
}
Chunk *hintName;
};
// A chunk for the import descriptor table.
// This chunk represent import-by-ordinal symbols.
// See Microsoft PE/COFF spec 7.1. Import Header for details.
class OrdinalOnlyChunk : public NonSectionChunk {
public:
explicit OrdinalOnlyChunk(uint16_t v) : ordinal(v) {
setAlignment(config->wordsize);
}
size_t getSize() const override { return config->wordsize; }
void writeTo(uint8_t *buf) const override {
// An import-by-ordinal slot has MSB 1 to indicate that
// this is import-by-ordinal (and not import-by-name).
if (config->is64()) {
write64le(buf, (1ULL << 63) | ordinal);
} else {
write32le(buf, (1ULL << 31) | ordinal);
}
}
uint16_t ordinal;
};
// A chunk for the import descriptor table.
class ImportDirectoryChunk : public NonSectionChunk {
public:
explicit ImportDirectoryChunk(Chunk *n) : dllName(n) {}
size_t getSize() const override { return sizeof(ImportDirectoryTableEntry); }
void writeTo(uint8_t *buf) const override {
memset(buf, 0, getSize());
auto *e = (coff_import_directory_table_entry *)(buf);
e->ImportLookupTableRVA = lookupTab->getRVA();
e->NameRVA = dllName->getRVA();
e->ImportAddressTableRVA = addressTab->getRVA();
}
Chunk *dllName;
Chunk *lookupTab;
Chunk *addressTab;
};
// A chunk representing null terminator in the import table.
// Contents of this chunk is always null bytes.
class NullChunk : public NonSectionChunk {
public:
explicit NullChunk(size_t n) : size(n) { hasData = false; }
size_t getSize() const override { return size; }
void writeTo(uint8_t *buf) const override {
memset(buf, 0, size);
}
private:
size_t size;
};
static std::vector<std::vector<DefinedImportData *>>
binImports(const std::vector<DefinedImportData *> &imports) {
// Group DLL-imported symbols by DLL name because that's how
// symbols are laid out in the import descriptor table.
auto less = [](const std::string &a, const std::string &b) {
return config->dllOrder[a] < config->dllOrder[b];
};
std::map<std::string, std::vector<DefinedImportData *>,
bool(*)(const std::string &, const std::string &)> m(less);
for (DefinedImportData *sym : imports)
m[sym->getDLLName().lower()].push_back(sym);
std::vector<std::vector<DefinedImportData *>> v;
for (auto &kv : m) {
// Sort symbols by name for each group.
std::vector<DefinedImportData *> &syms = kv.second;
std::sort(syms.begin(), syms.end(),
[](DefinedImportData *a, DefinedImportData *b) {
return a->getName() < b->getName();
});
v.push_back(std::move(syms));
}
return v;
}
// See Microsoft PE/COFF spec 4.3 for details.
// A chunk for the delay import descriptor table etnry.
class DelayDirectoryChunk : public NonSectionChunk {
public:
explicit DelayDirectoryChunk(Chunk *n) : dllName(n) {}
size_t getSize() const override {
return sizeof(delay_import_directory_table_entry);
}
void writeTo(uint8_t *buf) const override {
memset(buf, 0, getSize());
auto *e = (delay_import_directory_table_entry *)(buf);
e->Attributes = 1;
e->Name = dllName->getRVA();
e->ModuleHandle = moduleHandle->getRVA();
e->DelayImportAddressTable = addressTab->getRVA();
e->DelayImportNameTable = nameTab->getRVA();
}
Chunk *dllName;
Chunk *moduleHandle;
Chunk *addressTab;
Chunk *nameTab;
};
// Initial contents for delay-loaded functions.
// This code calls __delayLoadHelper2 function to resolve a symbol
// which then overwrites its jump table slot with the result
// for subsequent function calls.
static const uint8_t thunkX64[] = {
0x48, 0x8D, 0x05, 0, 0, 0, 0, // lea rax, [__imp_<FUNCNAME>]
0xE9, 0, 0, 0, 0, // jmp __tailMerge_<lib>
};
static const uint8_t tailMergeX64[] = {
0x51, // push rcx
0x52, // push rdx
0x41, 0x50, // push r8
0x41, 0x51, // push r9
0x48, 0x83, 0xEC, 0x48, // sub rsp, 48h
0x66, 0x0F, 0x7F, 0x04, 0x24, // movdqa xmmword ptr [rsp], xmm0
0x66, 0x0F, 0x7F, 0x4C, 0x24, 0x10, // movdqa xmmword ptr [rsp+10h], xmm1
0x66, 0x0F, 0x7F, 0x54, 0x24, 0x20, // movdqa xmmword ptr [rsp+20h], xmm2
0x66, 0x0F, 0x7F, 0x5C, 0x24, 0x30, // movdqa xmmword ptr [rsp+30h], xmm3
0x48, 0x8B, 0xD0, // mov rdx, rax
0x48, 0x8D, 0x0D, 0, 0, 0, 0, // lea rcx, [___DELAY_IMPORT_...]
0xE8, 0, 0, 0, 0, // call __delayLoadHelper2
0x66, 0x0F, 0x6F, 0x04, 0x24, // movdqa xmm0, xmmword ptr [rsp]
0x66, 0x0F, 0x6F, 0x4C, 0x24, 0x10, // movdqa xmm1, xmmword ptr [rsp+10h]
0x66, 0x0F, 0x6F, 0x54, 0x24, 0x20, // movdqa xmm2, xmmword ptr [rsp+20h]
0x66, 0x0F, 0x6F, 0x5C, 0x24, 0x30, // movdqa xmm3, xmmword ptr [rsp+30h]
0x48, 0x83, 0xC4, 0x48, // add rsp, 48h
0x41, 0x59, // pop r9
0x41, 0x58, // pop r8
0x5A, // pop rdx
0x59, // pop rcx
0xFF, 0xE0, // jmp rax
};
static const uint8_t thunkX86[] = {
0xB8, 0, 0, 0, 0, // mov eax, offset ___imp__<FUNCNAME>
0xE9, 0, 0, 0, 0, // jmp __tailMerge_<lib>
};
static const uint8_t tailMergeX86[] = {
0x51, // push ecx
0x52, // push edx
0x50, // push eax
0x68, 0, 0, 0, 0, // push offset ___DELAY_IMPORT_DESCRIPTOR_<DLLNAME>_dll
0xE8, 0, 0, 0, 0, // call ___delayLoadHelper2@8
0x5A, // pop edx
0x59, // pop ecx
0xFF, 0xE0, // jmp eax
};
static const uint8_t thunkARM[] = {
0x40, 0xf2, 0x00, 0x0c, // mov.w ip, #0 __imp_<FUNCNAME>
0xc0, 0xf2, 0x00, 0x0c, // mov.t ip, #0 __imp_<FUNCNAME>
0x00, 0xf0, 0x00, 0xb8, // b.w __tailMerge_<lib>
};
static const uint8_t tailMergeARM[] = {
0x2d, 0xe9, 0x0f, 0x48, // push.w {r0, r1, r2, r3, r11, lr}
0x0d, 0xf2, 0x10, 0x0b, // addw r11, sp, #16
0x2d, 0xed, 0x10, 0x0b, // vpush {d0, d1, d2, d3, d4, d5, d6, d7}
0x61, 0x46, // mov r1, ip
0x40, 0xf2, 0x00, 0x00, // mov.w r0, #0 DELAY_IMPORT_DESCRIPTOR
0xc0, 0xf2, 0x00, 0x00, // mov.t r0, #0 DELAY_IMPORT_DESCRIPTOR
0x00, 0xf0, 0x00, 0xd0, // bl #0 __delayLoadHelper2
0x84, 0x46, // mov ip, r0
0xbd, 0xec, 0x10, 0x0b, // vpop {d0, d1, d2, d3, d4, d5, d6, d7}
0xbd, 0xe8, 0x0f, 0x48, // pop.w {r0, r1, r2, r3, r11, lr}
0x60, 0x47, // bx ip
};
static const uint8_t thunkARM64[] = {
0x11, 0x00, 0x00, 0x90, // adrp x17, #0 __imp_<FUNCNAME>
0x31, 0x02, 0x00, 0x91, // add x17, x17, #0 :lo12:__imp_<FUNCNAME>
0x00, 0x00, 0x00, 0x14, // b __tailMerge_<lib>
};
static const uint8_t tailMergeARM64[] = {
0xfd, 0x7b, 0xb3, 0xa9, // stp x29, x30, [sp, #-208]!
0xfd, 0x03, 0x00, 0x91, // mov x29, sp
0xe0, 0x07, 0x01, 0xa9, // stp x0, x1, [sp, #16]
0xe2, 0x0f, 0x02, 0xa9, // stp x2, x3, [sp, #32]
0xe4, 0x17, 0x03, 0xa9, // stp x4, x5, [sp, #48]
0xe6, 0x1f, 0x04, 0xa9, // stp x6, x7, [sp, #64]
0xe0, 0x87, 0x02, 0xad, // stp q0, q1, [sp, #80]
0xe2, 0x8f, 0x03, 0xad, // stp q2, q3, [sp, #112]
0xe4, 0x97, 0x04, 0xad, // stp q4, q5, [sp, #144]
0xe6, 0x9f, 0x05, 0xad, // stp q6, q7, [sp, #176]
0xe1, 0x03, 0x11, 0xaa, // mov x1, x17
0x00, 0x00, 0x00, 0x90, // adrp x0, #0 DELAY_IMPORT_DESCRIPTOR
0x00, 0x00, 0x00, 0x91, // add x0, x0, #0 :lo12:DELAY_IMPORT_DESCRIPTOR
0x00, 0x00, 0x00, 0x94, // bl #0 __delayLoadHelper2
0xf0, 0x03, 0x00, 0xaa, // mov x16, x0
0xe6, 0x9f, 0x45, 0xad, // ldp q6, q7, [sp, #176]
0xe4, 0x97, 0x44, 0xad, // ldp q4, q5, [sp, #144]
0xe2, 0x8f, 0x43, 0xad, // ldp q2, q3, [sp, #112]
0xe0, 0x87, 0x42, 0xad, // ldp q0, q1, [sp, #80]
0xe6, 0x1f, 0x44, 0xa9, // ldp x6, x7, [sp, #64]
0xe4, 0x17, 0x43, 0xa9, // ldp x4, x5, [sp, #48]
0xe2, 0x0f, 0x42, 0xa9, // ldp x2, x3, [sp, #32]
0xe0, 0x07, 0x41, 0xa9, // ldp x0, x1, [sp, #16]
0xfd, 0x7b, 0xcd, 0xa8, // ldp x29, x30, [sp], #208
0x00, 0x02, 0x1f, 0xd6, // br x16
};
// A chunk for the delay import thunk.
class ThunkChunkX64 : public NonSectionChunk {
public:
ThunkChunkX64(Defined *i, Chunk *tm) : imp(i), tailMerge(tm) {}
size_t getSize() const override { return sizeof(thunkX64); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, thunkX64, sizeof(thunkX64));
write32le(buf + 3, imp->getRVA() - rva - 7);
write32le(buf + 8, tailMerge->getRVA() - rva - 12);
}
Defined *imp = nullptr;
Chunk *tailMerge = nullptr;
};
class TailMergeChunkX64 : public NonSectionChunk {
public:
TailMergeChunkX64(Chunk *d, Defined *h) : desc(d), helper(h) {}
size_t getSize() const override { return sizeof(tailMergeX64); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, tailMergeX64, sizeof(tailMergeX64));
write32le(buf + 39, desc->getRVA() - rva - 43);
write32le(buf + 44, helper->getRVA() - rva - 48);
}
Chunk *desc = nullptr;
Defined *helper = nullptr;
};
class ThunkChunkX86 : public NonSectionChunk {
public:
ThunkChunkX86(Defined *i, Chunk *tm) : imp(i), tailMerge(tm) {}
size_t getSize() const override { return sizeof(thunkX86); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, thunkX86, sizeof(thunkX86));
write32le(buf + 1, imp->getRVA() + config->imageBase);
write32le(buf + 6, tailMerge->getRVA() - rva - 10);
}
void getBaserels(std::vector<Baserel> *res) override {
res->emplace_back(rva + 1);
}
Defined *imp = nullptr;
Chunk *tailMerge = nullptr;
};
class TailMergeChunkX86 : public NonSectionChunk {
public:
TailMergeChunkX86(Chunk *d, Defined *h) : desc(d), helper(h) {}
size_t getSize() const override { return sizeof(tailMergeX86); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, tailMergeX86, sizeof(tailMergeX86));
write32le(buf + 4, desc->getRVA() + config->imageBase);
write32le(buf + 9, helper->getRVA() - rva - 13);
}
void getBaserels(std::vector<Baserel> *res) override {
res->emplace_back(rva + 4);
}
Chunk *desc = nullptr;
Defined *helper = nullptr;
};
class ThunkChunkARM : public NonSectionChunk {
public:
ThunkChunkARM(Defined *i, Chunk *tm) : imp(i), tailMerge(tm) {
setAlignment(2);
}
size_t getSize() const override { return sizeof(thunkARM); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, thunkARM, sizeof(thunkARM));
applyMOV32T(buf + 0, imp->getRVA() + config->imageBase);
applyBranch24T(buf + 8, tailMerge->getRVA() - rva - 12);
}
void getBaserels(std::vector<Baserel> *res) override {
res->emplace_back(rva + 0, IMAGE_REL_BASED_ARM_MOV32T);
}
Defined *imp = nullptr;
Chunk *tailMerge = nullptr;
};
class TailMergeChunkARM : public NonSectionChunk {
public:
TailMergeChunkARM(Chunk *d, Defined *h) : desc(d), helper(h) {
setAlignment(2);
}
size_t getSize() const override { return sizeof(tailMergeARM); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, tailMergeARM, sizeof(tailMergeARM));
applyMOV32T(buf + 14, desc->getRVA() + config->imageBase);
applyBranch24T(buf + 22, helper->getRVA() - rva - 26);
}
void getBaserels(std::vector<Baserel> *res) override {
res->emplace_back(rva + 14, IMAGE_REL_BASED_ARM_MOV32T);
}
Chunk *desc = nullptr;
Defined *helper = nullptr;
};
class ThunkChunkARM64 : public NonSectionChunk {
public:
ThunkChunkARM64(Defined *i, Chunk *tm) : imp(i), tailMerge(tm) {
setAlignment(4);
}
size_t getSize() const override { return sizeof(thunkARM64); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, thunkARM64, sizeof(thunkARM64));
applyArm64Addr(buf + 0, imp->getRVA(), rva + 0, 12);
applyArm64Imm(buf + 4, imp->getRVA() & 0xfff, 0);
applyArm64Branch26(buf + 8, tailMerge->getRVA() - rva - 8);
}
Defined *imp = nullptr;
Chunk *tailMerge = nullptr;
};
class TailMergeChunkARM64 : public NonSectionChunk {
public:
TailMergeChunkARM64(Chunk *d, Defined *h) : desc(d), helper(h) {
setAlignment(4);
}
size_t getSize() const override { return sizeof(tailMergeARM64); }
void writeTo(uint8_t *buf) const override {
memcpy(buf, tailMergeARM64, sizeof(tailMergeARM64));
applyArm64Addr(buf + 44, desc->getRVA(), rva + 44, 12);
applyArm64Imm(buf + 48, desc->getRVA() & 0xfff, 0);
applyArm64Branch26(buf + 52, helper->getRVA() - rva - 52);
}
Chunk *desc = nullptr;
Defined *helper = nullptr;
};
// A chunk for the import descriptor table.
class DelayAddressChunk : public NonSectionChunk {
public:
explicit DelayAddressChunk(Chunk *c) : thunk(c) {
setAlignment(config->wordsize);
}
size_t getSize() const override { return config->wordsize; }
void writeTo(uint8_t *buf) const override {
if (config->is64()) {
write64le(buf, thunk->getRVA() + config->imageBase);
} else {
uint32_t bit = 0;
// Pointer to thumb code must have the LSB set, so adjust it.
if (config->machine == ARMNT)
bit = 1;
write32le(buf, (thunk->getRVA() + config->imageBase) | bit);
}
}
void getBaserels(std::vector<Baserel> *res) override {
res->emplace_back(rva);
}
Chunk *thunk;
};
// Export table
// Read Microsoft PE/COFF spec 5.3 for details.
// A chunk for the export descriptor table.
class ExportDirectoryChunk : public NonSectionChunk {
public:
ExportDirectoryChunk(int i, int j, Chunk *d, Chunk *a, Chunk *n, Chunk *o)
: maxOrdinal(i), nameTabSize(j), dllName(d), addressTab(a), nameTab(n),
ordinalTab(o) {}
size_t getSize() const override {
return sizeof(export_directory_table_entry);
}
void writeTo(uint8_t *buf) const override {
memset(buf, 0, getSize());
auto *e = (export_directory_table_entry *)(buf);
e->NameRVA = dllName->getRVA();
e->OrdinalBase = 0;
e->AddressTableEntries = maxOrdinal + 1;
e->NumberOfNamePointers = nameTabSize;
e->ExportAddressTableRVA = addressTab->getRVA();
e->NamePointerRVA = nameTab->getRVA();
e->OrdinalTableRVA = ordinalTab->getRVA();
}
uint16_t maxOrdinal;
uint16_t nameTabSize;
Chunk *dllName;
Chunk *addressTab;
Chunk *nameTab;
Chunk *ordinalTab;
};
class AddressTableChunk : public NonSectionChunk {
public:
explicit AddressTableChunk(size_t maxOrdinal) : size(maxOrdinal + 1) {}
size_t getSize() const override { return size * 4; }
void writeTo(uint8_t *buf) const override {
memset(buf, 0, getSize());
for (const Export &e : config->exports) {
uint8_t *p = buf + e.ordinal * 4;
uint32_t bit = 0;
// Pointer to thumb code must have the LSB set, so adjust it.
if (config->machine == ARMNT && !e.data)
bit = 1;
if (e.forwardChunk) {
write32le(p, e.forwardChunk->getRVA() | bit);
} else {
assert(cast<Defined>(e.sym)->getRVA() != 0 &&
"Exported symbol unmapped");
write32le(p, cast<Defined>(e.sym)->getRVA() | bit);
}
}
}
private:
size_t size;
};
class NamePointersChunk : public NonSectionChunk {
public:
explicit NamePointersChunk(std::vector<Chunk *> &v) : chunks(v) {}
size_t getSize() const override { return chunks.size() * 4; }
void writeTo(uint8_t *buf) const override {
for (Chunk *c : chunks) {
write32le(buf, c->getRVA());
buf += 4;
}
}
private:
std::vector<Chunk *> chunks;
};
class ExportOrdinalChunk : public NonSectionChunk {
public:
explicit ExportOrdinalChunk(size_t i) : size(i) {}
size_t getSize() const override { return size * 2; }
void writeTo(uint8_t *buf) const override {
for (Export &e : config->exports) {
if (e.noname)
continue;
write16le(buf, e.ordinal);
buf += 2;
}
}
private:
size_t size;
};
} // anonymous namespace
void IdataContents::create() {
std::vector<std::vector<DefinedImportData *>> v = binImports(imports);
// Create .idata contents for each DLL.
for (std::vector<DefinedImportData *> &syms : v) {
// Create lookup and address tables. If they have external names,
// we need to create hintName chunks to store the names.
// If they don't (if they are import-by-ordinals), we store only
// ordinal values to the table.
size_t base = lookups.size();
for (DefinedImportData *s : syms) {
uint16_t ord = s->getOrdinal();
if (s->getExternalName().empty()) {
lookups.push_back(make<OrdinalOnlyChunk>(ord));
addresses.push_back(make<OrdinalOnlyChunk>(ord));
continue;
}
auto *c = make<HintNameChunk>(s->getExternalName(), ord);
lookups.push_back(make<LookupChunk>(c));
addresses.push_back(make<LookupChunk>(c));
hints.push_back(c);
}
// Terminate with null values.
lookups.push_back(make<NullChunk>(config->wordsize));
addresses.push_back(make<NullChunk>(config->wordsize));
for (int i = 0, e = syms.size(); i < e; ++i)
syms[i]->setLocation(addresses[base + i]);
// Create the import table header.
dllNames.push_back(make<StringChunk>(syms[0]->getDLLName()));
auto *dir = make<ImportDirectoryChunk>(dllNames.back());
dir->lookupTab = lookups[base];
dir->addressTab = addresses[base];
dirs.push_back(dir);
}
// Add null terminator.
dirs.push_back(make<NullChunk>(sizeof(ImportDirectoryTableEntry)));
}
std::vector<Chunk *> DelayLoadContents::getChunks() {
std::vector<Chunk *> v;
v.insert(v.end(), dirs.begin(), dirs.end());
v.insert(v.end(), names.begin(), names.end());
v.insert(v.end(), hintNames.begin(), hintNames.end());
v.insert(v.end(), dllNames.begin(), dllNames.end());
return v;
}
std::vector<Chunk *> DelayLoadContents::getDataChunks() {
std::vector<Chunk *> v;
v.insert(v.end(), moduleHandles.begin(), moduleHandles.end());
v.insert(v.end(), addresses.begin(), addresses.end());
return v;
}
uint64_t DelayLoadContents::getDirSize() {
return dirs.size() * sizeof(delay_import_directory_table_entry);
}
void DelayLoadContents::create(COFFLinkerContext &ctx, Defined *h) {
helper = h;
std::vector<std::vector<DefinedImportData *>> v = binImports(imports);
// Create .didat contents for each DLL.
for (std::vector<DefinedImportData *> &syms : v) {
// Create the delay import table header.
dllNames.push_back(make<StringChunk>(syms[0]->getDLLName()));
auto *dir = make<DelayDirectoryChunk>(dllNames.back());
size_t base = addresses.size();
Chunk *tm = newTailMergeChunk(dir);
for (DefinedImportData *s : syms) {
Chunk *t = newThunkChunk(s, tm);
auto *a = make<DelayAddressChunk>(t);
addresses.push_back(a);
thunks.push_back(t);
StringRef extName = s->getExternalName();
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);
// Add a syntentic symbol for this load thunk, using the "__imp_load"
// prefix, in case this thunk needs to be added to the list of valid
// call targets for Control Flow Guard.
StringRef symName = saver().save("__imp_load_" + extName);
s->loadThunkSym =
cast<DefinedSynthetic>(ctx.symtab.addSynthetic(symName, t));
}
}
thunks.push_back(tm);
StringRef tmName =
saver().save("__tailMerge_" + syms[0]->getDLLName().lower());
ctx.symtab.addSynthetic(tmName, tm);
// 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->setAlignment(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::newTailMergeChunk(Chunk *dir) {
switch (config->machine) {
case AMD64:
return make<TailMergeChunkX64>(dir, helper);
case I386:
return make<TailMergeChunkX86>(dir, helper);
case ARMNT:
return make<TailMergeChunkARM>(dir, helper);
case ARM64:
return make<TailMergeChunkARM64>(dir, helper);
default:
llvm_unreachable("unsupported machine type");
}
}
Chunk *DelayLoadContents::newThunkChunk(DefinedImportData *s,
Chunk *tailMerge) {
switch (config->machine) {
case AMD64:
return make<ThunkChunkX64>(s, tailMerge);
case I386:
return make<ThunkChunkX86>(s, tailMerge);
case ARMNT:
return make<ThunkChunkARM>(s, tailMerge);
case ARM64:
return make<ThunkChunkARM64>(s, tailMerge);
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
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