//===-- BreakpointResolverFileLine.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/Breakpoint/BreakpointResolverFileLine.h" // C Includes // C++ Includes // Other libraries and framework includes // Project includes #include "lldb/Breakpoint/BreakpointLocation.h" #include "lldb/Core/Log.h" #include "lldb/Core/Module.h" #include "lldb/Core/StreamString.h" #include "lldb/Symbol/CompileUnit.h" #include "lldb/Symbol/Function.h" #include "lldb/lldb-private-log.h" using namespace lldb; using namespace lldb_private; //---------------------------------------------------------------------- // BreakpointResolverFileLine: //---------------------------------------------------------------------- BreakpointResolverFileLine::BreakpointResolverFileLine ( Breakpoint *bkpt, const FileSpec &file_spec, uint32_t line_no, bool check_inlines, bool skip_prologue ) : BreakpointResolver (bkpt, BreakpointResolver::FileLineResolver), m_file_spec (file_spec), m_line_number (line_no), m_inlines (check_inlines), m_skip_prologue(skip_prologue) { } BreakpointResolverFileLine::~BreakpointResolverFileLine () { } Searcher::CallbackReturn BreakpointResolverFileLine::SearchCallback ( SearchFilter &filter, SymbolContext &context, Address *addr, bool containing ) { SymbolContextList sc_list; assert (m_breakpoint != NULL); Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS)); // There is a tricky bit here. You can have two compilation units that #include the same file, and // in one of them the function at m_line_number is used (and so code and a line entry for it is generated) but in the // other it isn't. If we considered the CU's independently, then in the second inclusion, we'd move the breakpoint // to the next function that actually generated code in the header file. That would end up being confusing. // So instead, we do the CU iterations by hand here, then scan through the complete list of matches, and figure out // the closest line number match, and only set breakpoints on that match. // Note also that if file_spec only had a file name and not a directory, there may be many different file spec's in // the resultant list. The closest line match for one will not be right for some totally different file. // So we go through the match list and pull out the sets that have the same file spec in their line_entry // and treat each set separately. const size_t num_comp_units = context.module_sp->GetNumCompileUnits(); for (size_t i = 0; i < num_comp_units; i++) { CompUnitSP cu_sp (context.module_sp->GetCompileUnitAtIndex (i)); if (cu_sp) { if (filter.CompUnitPasses(*cu_sp)) cu_sp->ResolveSymbolContext (m_file_spec, m_line_number, m_inlines, false, eSymbolContextEverything, sc_list); } } while (sc_list.GetSize() > 0) { SymbolContextList tmp_sc_list; unsigned current_idx = 0; SymbolContext sc; bool first_entry = true; FileSpec match_file_spec; uint32_t closest_line_number = UINT32_MAX; // Pull out the first entry, and all the others that match its file spec, and stuff them in the tmp list. while (current_idx < sc_list.GetSize()) { bool matches; sc_list.GetContextAtIndex (current_idx, sc); if (first_entry) { match_file_spec = sc.line_entry.file; matches = true; first_entry = false; } else matches = (sc.line_entry.file == match_file_spec); if (matches) { tmp_sc_list.Append (sc); sc_list.RemoveContextAtIndex(current_idx); // ResolveSymbolContext will always return a number that is >= the line number you pass in. // So the smaller line number is always better. if (sc.line_entry.line < closest_line_number) closest_line_number = sc.line_entry.line; } else current_idx++; } // Okay, we've found the closest line number match, now throw away all the others: current_idx = 0; while (current_idx < tmp_sc_list.GetSize()) { if (tmp_sc_list.GetContextAtIndex(current_idx, sc)) { if (sc.line_entry.line != closest_line_number) tmp_sc_list.RemoveContextAtIndex(current_idx); else current_idx++; } } // Next go through and see if there are line table entries that are contiguous, and if so keep only the // first of the contiguous range: lldb::addr_t last_end_addr = LLDB_INVALID_ADDRESS; current_idx = 0; while (current_idx < tmp_sc_list.GetSize()) { if (tmp_sc_list.GetContextAtIndex(current_idx, sc)) { lldb::addr_t start_file_addr = sc.line_entry.range.GetBaseAddress().GetFileAddress(); lldb::addr_t end_file_addr = start_file_addr + sc.line_entry.range.GetByteSize(); if (start_file_addr == last_end_addr) tmp_sc_list.RemoveContextAtIndex(current_idx); else current_idx++; last_end_addr = end_file_addr; } } // and make breakpoints out of the closest line number match. uint32_t tmp_sc_list_size = tmp_sc_list.GetSize(); for (uint32_t i = 0; i < tmp_sc_list_size; i++) { if (tmp_sc_list.GetContextAtIndex(i, sc)) { Address line_start = sc.line_entry.range.GetBaseAddress(); if (line_start.IsValid()) { if (filter.AddressPasses(line_start)) { // If the line number is before the prologue end, move it there... bool skipped_prologue = false; if (m_skip_prologue) { if (sc.function) { Address prologue_addr(sc.function->GetAddressRange().GetBaseAddress()); if (prologue_addr.IsValid() && (line_start == prologue_addr)) { const uint32_t prologue_byte_size = sc.function->GetPrologueByteSize(); if (prologue_byte_size) { prologue_addr.Slide(prologue_byte_size); if (filter.AddressPasses(prologue_addr)) { skipped_prologue = true; line_start = prologue_addr; } } } } } BreakpointLocationSP bp_loc_sp (m_breakpoint->AddLocation(line_start)); if (log && bp_loc_sp && !m_breakpoint->IsInternal()) { StreamString s; bp_loc_sp->GetDescription (&s, lldb::eDescriptionLevelVerbose); log->Printf ("Added location (skipped prologue: %s): %s \n", skipped_prologue ? "yes" : "no", s.GetData()); } } else if (log) { log->Printf ("Breakpoint at file address 0x%" PRIx64 " for %s:%d didn't pass the filter.\n", line_start.GetFileAddress(), m_file_spec.GetFilename().AsCString(""), m_line_number); } } else { if (log) log->Printf ("error: Unable to set breakpoint at file address 0x%" PRIx64 " for %s:%d\n", line_start.GetFileAddress(), m_file_spec.GetFilename().AsCString(""), m_line_number); } } } } return Searcher::eCallbackReturnContinue; } Searcher::Depth BreakpointResolverFileLine::GetDepth() { return Searcher::eDepthModule; } void BreakpointResolverFileLine::GetDescription (Stream *s) { s->Printf ("file = '%s', line = %u", m_file_spec.GetPath().c_str(), m_line_number); } void BreakpointResolverFileLine::Dump (Stream *s) const { }