Sean Callanan | 051052f | 2010-07-02 22:22:28 +0000 | [diff] [blame] | 1 | //===-- IRToDWARF.cpp -------------------------------------------*- C++ -*-===// |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "lldb/Expression/IRToDWARF.h" |
| 11 | |
| 12 | #include "llvm/Support/raw_ostream.h" |
| 13 | #include "llvm/InstrTypes.h" |
| 14 | #include "llvm/Module.h" |
| 15 | |
| 16 | #include "lldb/Core/dwarf.h" |
| 17 | #include "lldb/Core/Log.h" |
| 18 | #include "lldb/Core/Scalar.h" |
| 19 | #include "lldb/Core/StreamString.h" |
| 20 | #include "lldb/Expression/ClangExpressionDeclMap.h" |
| 21 | #include "lldb/Expression/ClangExpressionVariable.h" |
| 22 | |
| 23 | #include <map> |
| 24 | |
| 25 | using namespace llvm; |
| 26 | |
Sean Callanan | 3351dac | 2010-08-18 18:50:51 +0000 | [diff] [blame] | 27 | static char ID; |
| 28 | |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 29 | IRToDWARF::IRToDWARF(lldb_private::ClangExpressionVariableStore &local_vars, |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 30 | lldb_private::ClangExpressionDeclMap *decl_map, |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 31 | lldb_private::StreamString &strm, |
| 32 | const char *func_name) : |
Sean Callanan | 47a5c4c | 2010-09-23 03:01:22 +0000 | [diff] [blame] | 33 | ModulePass(ID), |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 34 | m_local_vars(local_vars), |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 35 | m_decl_map(decl_map), |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 36 | m_strm(strm), |
| 37 | m_func_name(func_name) |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 38 | { |
| 39 | } |
| 40 | |
| 41 | IRToDWARF::~IRToDWARF() |
| 42 | { |
| 43 | } |
| 44 | |
| 45 | class Relocator |
| 46 | { |
| 47 | public: |
| 48 | Relocator() |
| 49 | { |
| 50 | } |
| 51 | |
| 52 | ~Relocator() |
| 53 | { |
| 54 | } |
| 55 | |
| 56 | void MarkBasicBlock(BasicBlock *bb, uint16_t offset) |
| 57 | { |
| 58 | m_basic_blocks[bb] = offset; |
| 59 | } |
| 60 | |
| 61 | bool BasicBlockIsMarked(BasicBlock *bb) |
| 62 | { |
| 63 | return m_basic_blocks.find(bb) != m_basic_blocks.end(); |
| 64 | } |
| 65 | |
| 66 | void MarkRelocation(BasicBlock *bb, uint16_t offset) |
| 67 | { |
| 68 | m_relocations[offset] = bb; |
| 69 | } |
| 70 | |
| 71 | bool ResolveRelocations(lldb_private::StreamString &strm) |
| 72 | { |
| 73 | std::map<uint16_t, BasicBlock*>::const_iterator iter; |
| 74 | |
| 75 | lldb_private::StreamString swapper(0, 32, strm.GetByteOrder()); |
| 76 | |
| 77 | // This array must be delete [] d at every exit |
| 78 | size_t temporary_bufsize = strm.GetSize(); |
| 79 | uint8_t *temporary_buffer(new uint8_t[temporary_bufsize]); |
| 80 | |
| 81 | memcpy(temporary_buffer, strm.GetData(), temporary_bufsize); |
| 82 | |
| 83 | for (iter = m_relocations.begin(); |
| 84 | iter != m_relocations.end(); |
| 85 | ++iter) |
| 86 | { |
| 87 | const std::pair<uint16_t, BasicBlock*> &pair = *iter; |
| 88 | |
| 89 | uint16_t off = pair.first; |
| 90 | BasicBlock *bb = pair.second; |
| 91 | |
| 92 | if (m_basic_blocks.find(bb) == m_basic_blocks.end()) |
| 93 | { |
| 94 | delete [] temporary_buffer; |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | uint16_t target_off = m_basic_blocks[bb]; |
| 99 | |
| 100 | int16_t relative = (int16_t)target_off - (int16_t)off; |
| 101 | |
| 102 | swapper.Clear(); |
Sean Callanan | 702abd6 | 2010-07-02 21:28:35 +0000 | [diff] [blame] | 103 | swapper << relative; |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 104 | |
Sean Callanan | 702abd6 | 2010-07-02 21:28:35 +0000 | [diff] [blame] | 105 | // off is intended to be the offset of the branch opcode (which is |
| 106 | // what the relative location is added to) so |
| 107 | // (temporary_buffer + off + 1) skips the opcode and writes to the |
| 108 | // relative location |
| 109 | memcpy(temporary_buffer + off + 1, swapper.GetData(), sizeof(uint16_t)); |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | strm.Clear(); |
| 113 | strm.Write(temporary_buffer, temporary_bufsize); |
| 114 | |
| 115 | delete [] temporary_buffer; |
| 116 | return true; |
| 117 | } |
| 118 | private: |
| 119 | std::map<BasicBlock*, uint16_t> m_basic_blocks; |
| 120 | std::map<uint16_t, BasicBlock*> m_relocations; |
| 121 | }; |
| 122 | |
| 123 | bool |
| 124 | IRToDWARF::runOnBasicBlock(BasicBlock &BB, Relocator &R) |
Sean Callanan | 321fe9e | 2010-07-28 01:00:59 +0000 | [diff] [blame] | 125 | { |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 126 | /////////////////////////////////////// |
| 127 | // Mark the current block as visited |
| 128 | // |
| 129 | |
| 130 | size_t stream_size = m_strm.GetSize(); |
| 131 | |
| 132 | if (stream_size > 0xffff) |
| 133 | return false; |
| 134 | |
| 135 | uint16_t offset = stream_size & 0xffff; |
| 136 | |
| 137 | R.MarkBasicBlock(&BB, offset); |
| 138 | |
| 139 | //////////////////////////////////////////////// |
| 140 | // Translate the current basic block to DWARF |
| 141 | // |
| 142 | |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 143 | ///////////////////////////////////////////////// |
| 144 | // Visit all successors we haven't visited yet |
| 145 | // |
| 146 | |
| 147 | TerminatorInst *arnold = BB.getTerminator(); |
| 148 | |
| 149 | if (!arnold) |
| 150 | return false; |
| 151 | |
| 152 | unsigned successor_index; |
| 153 | unsigned num_successors = arnold->getNumSuccessors(); |
| 154 | |
| 155 | for (successor_index = 0; |
| 156 | successor_index < num_successors; |
| 157 | ++successor_index) |
| 158 | { |
| 159 | BasicBlock *successor = arnold->getSuccessor(successor_index); |
| 160 | |
| 161 | if (!R.BasicBlockIsMarked(successor)) |
| 162 | { |
| 163 | if (!runOnBasicBlock(*successor, R)) |
| 164 | return false; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | return true; |
| 169 | } |
| 170 | |
| 171 | bool |
| 172 | IRToDWARF::runOnModule(Module &M) |
| 173 | { |
| 174 | lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS); |
| 175 | |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 176 | llvm::Function* function = M.getFunction(StringRef(m_func_name.c_str())); |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 177 | |
| 178 | if (!function) |
| 179 | { |
| 180 | if (log) |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 181 | log->Printf("Couldn't find %s() in the module", m_func_name.c_str()); |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 182 | |
Sean Callanan | 65dafa8 | 2010-08-27 01:01:44 +0000 | [diff] [blame] | 183 | return false; |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | Relocator relocator; |
| 187 | |
Sean Callanan | 5cf4a1c | 2010-07-03 01:35:46 +0000 | [diff] [blame] | 188 | if (!runOnBasicBlock(function->getEntryBlock(), relocator)) |
| 189 | return false; |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 190 | |
Sean Callanan | 321fe9e | 2010-07-28 01:00:59 +0000 | [diff] [blame] | 191 | if (log) |
| 192 | { |
| 193 | std::string s; |
| 194 | raw_string_ostream oss(s); |
| 195 | |
| 196 | M.print(oss, NULL); |
| 197 | |
| 198 | oss.flush(); |
| 199 | |
| 200 | log->Printf("Module being translated to DWARF: \n%s", s.c_str()); |
| 201 | } |
| 202 | |
Sean Callanan | 5cf4a1c | 2010-07-03 01:35:46 +0000 | [diff] [blame] | 203 | // TEMPORARY: Fail in order to force execution in the target. |
| 204 | return false; |
Sean Callanan | dcb658b | 2010-07-02 21:09:36 +0000 | [diff] [blame] | 205 | |
| 206 | return relocator.ResolveRelocations(m_strm); |
| 207 | } |
| 208 | |
| 209 | void |
| 210 | IRToDWARF::assignPassManager(PMStack &PMS, |
| 211 | PassManagerType T) |
| 212 | { |
| 213 | } |
| 214 | |
| 215 | PassManagerType |
| 216 | IRToDWARF::getPotentialPassManagerType() const |
| 217 | { |
| 218 | return PMT_ModulePassManager; |
| 219 | } |