Expected<section_iterator>
WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
llvm_unreachable("not yet implemented");
return errorCodeToError(object_error::invalid_symbol_index);
}
Expected<SymbolRef::Type>
WasmObjectFile::getSymbolType(DataRefImpl Symb) const {
llvm_unreachable("not yet implemented");
return errorCodeToError(object_error::invalid_symbol_index);
}
Error orcError(OrcErrorCode ErrCode) {
typedef std::underlying_type<OrcErrorCode>::type UT;
return errorCodeToError(
std::error_code(static_cast<UT>(ErrCode), *OrcErrCat));
}
Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
llvm_unreachable("not yet implemented");
return errorCodeToError(object_error::invalid_symbol_index);
}
Error OrcI386::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
unsigned MinStubs, void *InitialPtrVal) {
// Stub format is:
//
// .section __orc_stubs
// stub1:
// jmpq *ptr1
// .byte 0xC4 ; <- Invalid opcode padding.
// .byte 0xF1
// stub2:
// jmpq *ptr2
//
// ...
//
// .section __orc_ptrs
// ptr1:
// .quad 0x0
// ptr2:
// .quad 0x0
//
// ...
const unsigned StubSize = IndirectStubsInfo::StubSize;
// Emit at least MinStubs, rounded up to fill the pages allocated.
unsigned PageSize = sys::Process::getPageSize();
unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
unsigned NumStubs = (NumPages * PageSize) / StubSize;
// Allocate memory for stubs and pointers in one call.
std::error_code EC;
auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
2 * NumPages * PageSize, nullptr,
sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
if (EC)
return errorCodeToError(EC);
// Create separate MemoryBlocks representing the stubs and pointers.
sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
NumPages * PageSize,
NumPages * PageSize);
// Populate the stubs page stubs and mark it executable.
uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
uint64_t PtrAddr = reinterpret_cast<uint64_t>(PtrsBlock.base());
for (unsigned I = 0; I < NumStubs; ++I, PtrAddr += 4)
Stub[I] = 0xF1C40000000025ff | (PtrAddr << 16);
if (auto EC = sys::Memory::protectMappedMemory(
StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
return errorCodeToError(EC);
// Initialize all pointers to point at FailureAddress.
void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
for (unsigned I = 0; I < NumStubs; ++I)
Ptr[I] = InitialPtrVal;
StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
return Error::success();
}