| //===-- IRToDWARF.cpp -------------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Expression/IRToDWARF.h" |
| |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/InstrTypes.h" |
| #include "llvm/Module.h" |
| |
| #include "lldb/Core/dwarf.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/Scalar.h" |
| #include "lldb/Core/StreamString.h" |
| #include "lldb/Expression/ClangExpressionDeclMap.h" |
| #include "lldb/Expression/ClangExpressionVariable.h" |
| |
| #include <map> |
| |
| using namespace llvm; |
| |
| static char ID; |
| |
| IRToDWARF::IRToDWARF(lldb_private::ClangExpressionVariableStore &local_vars, |
| lldb_private::ClangExpressionDeclMap *decl_map, |
| lldb_private::StreamString &strm, |
| const char *func_name) : |
| ModulePass(ID), |
| m_local_vars(local_vars), |
| m_decl_map(decl_map), |
| m_strm(strm), |
| m_func_name(func_name) |
| { |
| } |
| |
| IRToDWARF::~IRToDWARF() |
| { |
| } |
| |
| class Relocator |
| { |
| public: |
| Relocator() |
| { |
| } |
| |
| ~Relocator() |
| { |
| } |
| |
| void MarkBasicBlock(BasicBlock *bb, uint16_t offset) |
| { |
| m_basic_blocks[bb] = offset; |
| } |
| |
| bool BasicBlockIsMarked(BasicBlock *bb) |
| { |
| return m_basic_blocks.find(bb) != m_basic_blocks.end(); |
| } |
| |
| void MarkRelocation(BasicBlock *bb, uint16_t offset) |
| { |
| m_relocations[offset] = bb; |
| } |
| |
| bool ResolveRelocations(lldb_private::StreamString &strm) |
| { |
| std::map<uint16_t, BasicBlock*>::const_iterator iter; |
| |
| lldb_private::StreamString swapper(0, 32, strm.GetByteOrder()); |
| |
| // This array must be delete [] d at every exit |
| size_t temporary_bufsize = strm.GetSize(); |
| uint8_t *temporary_buffer(new uint8_t[temporary_bufsize]); |
| |
| memcpy(temporary_buffer, strm.GetData(), temporary_bufsize); |
| |
| for (iter = m_relocations.begin(); |
| iter != m_relocations.end(); |
| ++iter) |
| { |
| const std::pair<uint16_t, BasicBlock*> &pair = *iter; |
| |
| uint16_t off = pair.first; |
| BasicBlock *bb = pair.second; |
| |
| if (m_basic_blocks.find(bb) == m_basic_blocks.end()) |
| { |
| delete [] temporary_buffer; |
| return false; |
| } |
| |
| uint16_t target_off = m_basic_blocks[bb]; |
| |
| int16_t relative = (int16_t)target_off - (int16_t)off; |
| |
| swapper.Clear(); |
| swapper << relative; |
| |
| // off is intended to be the offset of the branch opcode (which is |
| // what the relative location is added to) so |
| // (temporary_buffer + off + 1) skips the opcode and writes to the |
| // relative location |
| memcpy(temporary_buffer + off + 1, swapper.GetData(), sizeof(uint16_t)); |
| } |
| |
| strm.Clear(); |
| strm.Write(temporary_buffer, temporary_bufsize); |
| |
| delete [] temporary_buffer; |
| return true; |
| } |
| private: |
| std::map<BasicBlock*, uint16_t> m_basic_blocks; |
| std::map<uint16_t, BasicBlock*> m_relocations; |
| }; |
| |
| bool |
| IRToDWARF::runOnBasicBlock(BasicBlock &BB, Relocator &R) |
| { |
| /////////////////////////////////////// |
| // Mark the current block as visited |
| // |
| |
| size_t stream_size = m_strm.GetSize(); |
| |
| if (stream_size > 0xffff) |
| return false; |
| |
| uint16_t offset = stream_size & 0xffff; |
| |
| R.MarkBasicBlock(&BB, offset); |
| |
| //////////////////////////////////////////////// |
| // Translate the current basic block to DWARF |
| // |
| |
| ///////////////////////////////////////////////// |
| // Visit all successors we haven't visited yet |
| // |
| |
| TerminatorInst *arnold = BB.getTerminator(); |
| |
| if (!arnold) |
| return false; |
| |
| unsigned successor_index; |
| unsigned num_successors = arnold->getNumSuccessors(); |
| |
| for (successor_index = 0; |
| successor_index < num_successors; |
| ++successor_index) |
| { |
| BasicBlock *successor = arnold->getSuccessor(successor_index); |
| |
| if (!R.BasicBlockIsMarked(successor)) |
| { |
| if (!runOnBasicBlock(*successor, R)) |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool |
| IRToDWARF::runOnModule(Module &M) |
| { |
| lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS); |
| |
| llvm::Function* function = M.getFunction(StringRef(m_func_name.c_str())); |
| |
| if (!function) |
| { |
| if (log) |
| log->Printf("Couldn't find %s() in the module", m_func_name.c_str()); |
| |
| return false; |
| } |
| |
| Relocator relocator; |
| |
| if (!runOnBasicBlock(function->getEntryBlock(), relocator)) |
| return false; |
| |
| if (log) |
| { |
| std::string s; |
| raw_string_ostream oss(s); |
| |
| M.print(oss, NULL); |
| |
| oss.flush(); |
| |
| log->Printf("Module being translated to DWARF: \n%s", s.c_str()); |
| } |
| |
| // TEMPORARY: Fail in order to force execution in the target. |
| return false; |
| |
| return relocator.ResolveRelocations(m_strm); |
| } |
| |
| void |
| IRToDWARF::assignPassManager(PMStack &PMS, |
| PassManagerType T) |
| { |
| } |
| |
| PassManagerType |
| IRToDWARF::getPotentialPassManagerType() const |
| { |
| return PMT_ModulePassManager; |
| } |