void RuntimeDyldImpl::resolveExternalSymbols() {
StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
e = ExternalSymbolRelocations.end();
for (; i != e; i++) {
StringRef Name = i->first();
RelocationList &Relocs = i->second;
SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
if (Loc == GlobalSymbolTable.end()) {
if (Name.size() == 0) {
// This is an absolute symbol, use an address of zero.
DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
resolveRelocationList(Relocs, 0);
} else {
// This is an external symbol, try to get its address from
// MemoryManager.
uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
true);
DEBUG(dbgs() << "Resolving relocations Name: " << Name
<< "\t" << format("%p", Addr)
<< "\n");
resolveRelocationList(Relocs, (uintptr_t)Addr);
}
} else {
report_fatal_error("Expected external symbol");
}
}
}
void RuntimeDyldImpl::resolveExternalSymbols() {
while (!ExternalSymbolRelocations.empty()) {
StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
StringRef Name = i->first();
if (Name.size() == 0) {
// This is an absolute symbol, use an address of zero.
DEBUG(dbgs() << "Resolving absolute relocations."
<< "\n");
RelocationList &Relocs = i->second;
resolveRelocationList(Relocs, 0);
} else {
uint64_t Addr = 0;
SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
if (Loc == GlobalSymbolTable.end()) {
// This is an external symbol, try to get its address from
// MemoryManager.
Addr = MemMgr->getSymbolAddress(Name.data());
// The call to getSymbolAddress may have caused additional modules to
// be loaded, which may have added new entries to the
// ExternalSymbolRelocations map. Consquently, we need to update our
// iterator. This is also why retrieval of the relocation list
// associated with this symbol is deferred until below this point.
// New entries may have been added to the relocation list.
i = ExternalSymbolRelocations.find(Name);
} else {
// We found the symbol in our global table. It was probably in a
// Module that we loaded previously.
SymbolLoc SymLoc = Loc->second;
Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
}
// FIXME: Implement error handling that doesn't kill the host program!
if (!Addr)
report_fatal_error("Program used external function '" + Name +
"' which could not be resolved!");
updateGOTEntries(Name, Addr);
DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
<< format("0x%lx", Addr) << "\n");
// This list may have been updated when we called getSymbolAddress, so
// don't change this code to get the list earlier.
RelocationList &Relocs = i->second;
resolveRelocationList(Relocs, Addr);
}
ExternalSymbolRelocations.erase(i);
}
}
// resolveSymbols - Resolve any relocations to the specified symbols if
// we know where it lives.
void RuntimeDyldImpl::resolveSymbols() {
StringMap<RelocationList>::iterator i = SymbolRelocations.begin(),
e = SymbolRelocations.end();
for (; i != e; i++) {
StringRef Name = i->first();
RelocationList &Relocs = i->second;
StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
if (Loc == SymbolTable.end()) {
// This is an external symbol, try to get it address from
// MemoryManager.
uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
true);
DEBUG(dbgs() << "Resolving relocations Name: " << Name
<< "\t" << format("%p", Addr)
<< "\n");
resolveRelocationList(Relocs, (uintptr_t)Addr);
} else {
// Change the relocation to be section relative rather than symbol
// relative and move it to the resolved relocation list.
DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
for (int i = 0, e = Relocs.size(); i != e; ++i) {
RelocationEntry Entry = Relocs[i];
Entry.Addend += Loc->second.second;
Relocations[Loc->second.first].push_back(Entry);
}
Relocs.clear();
}
}
}
void RuntimeDyldImpl::resolveExternalSymbols() {
while(!ExternalSymbolRelocations.empty()) {
StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
StringRef Name = i->first();
RelocationList &Relocs = i->second;
if (Name.size() == 0) {
// This is an absolute symbol, use an address of zero.
DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
resolveRelocationList(Relocs, 0);
} else {
uint64_t Addr = 0;
SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
if (Loc == GlobalSymbolTable.end()) {
// This is an external symbol, try to get its address from
// MemoryManager.
Addr = MemMgr->getSymbolAddress(Name.data());
} else {
// We found the symbol in our global table. It was probably in a
// Module that we loaded previously.
SymbolLoc SymLoc = GlobalSymbolTable.lookup(Name);
Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
}
// FIXME: Implement error handling that doesn't kill the host program!
if (!Addr)
report_fatal_error("Program used external function '" + Name +
"' which could not be resolved!");
updateGOTEntries(Name, Addr);
DEBUG(dbgs() << "Resolving relocations Name: " << Name
<< "\t" << format("0x%lx", Addr)
<< "\n");
resolveRelocationList(Relocs, Addr);
}
ExternalSymbolRelocations.erase(i->first());
}
}
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// First, resolve relocations associated with external symbols.
resolveExternalSymbols();
// Just iterate over the sections we have and resolve all the relocations
// in them. Gross overkill, but it gets the job done.
for (int i = 0, e = Sections.size(); i != e; ++i) {
uint64_t Addr = Sections[i].LoadAddress;
DEBUG(dbgs() << "Resolving relocations Section #" << i
<< "\t" << format("%p", (uint8_t *)Addr)
<< "\n");
resolveRelocationList(Relocations[i], Addr);
}
}
// Assign an address to a symbol name and resolve all the relocations
// associated with it.
void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
// a remote execution environment of some sort. Re-apply any
// relocations referencing this section with the given address.
//
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
Sections[SectionID].LoadAddress = Addr;
DEBUG(dbgs() << "Resolving relocations Section #" << SectionID
<< "\t" << format("%p", (uint8_t *)Addr)
<< "\n");
resolveRelocationList(Relocations[SectionID], Addr);
}
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// First, resolve relocations associated with external symbols.
resolveExternalSymbols();
// Just iterate over the sections we have and resolve all the relocations
// in them. Gross overkill, but it gets the job done.
for (int i = 0, e = Sections.size(); i != e; ++i) {
// The Section here (Sections[i]) refers to the section in which the
// symbol for the relocation is located. The SectionID in the relocation
// entry provides the section to which the relocation will be applied.
uint64_t Addr = Sections[i].LoadAddress;
DEBUG(dbgs() << "Resolving relocations Section #" << i
<< "\t" << format("%p", (uint8_t *)Addr)
<< "\n");
resolveRelocationList(Relocations[i], Addr);
Relocations.erase(i);
}
}
