lldb/Symbol/LineTable.h

//===-- LineTable.h ---------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_LineTable_h_
#define liblldb_LineTable_h_

#include <vector>

#include "lldb/lldb-private.h"
#include "lldb/Symbol/LineEntry.h"
#include "lldb/Core/ModuleChild.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/RangeMap.h"

namespace lldb_private {

//----------------------------------------------------------------------
/// @class LineSequence LineTable.h "lldb/Symbol/LineTable.h"
/// @brief An abstract base class used during symbol table creation.
//----------------------------------------------------------------------
class LineSequence
{
public:
    LineSequence ();

    virtual
    ~LineSequence() {}

    virtual void
    Clear() = 0;

private:
    DISALLOW_COPY_AND_ASSIGN (LineSequence);
};

//----------------------------------------------------------------------
/// @class LineTable LineTable.h "lldb/Symbol/LineTable.h"
/// @brief A line table class.
//----------------------------------------------------------------------
class LineTable
{
public:
    //------------------------------------------------------------------
    /// Construct with compile unit.
    ///
    /// @param[in] comp_unit
    ///     The compile unit to which this line table belongs.
    //------------------------------------------------------------------
    LineTable (CompileUnit* comp_unit);

    //------------------------------------------------------------------
    /// Destructor.
    //------------------------------------------------------------------
    ~LineTable ();

    //------------------------------------------------------------------
    /// Adds a new line entry to this line table.
    ///
    /// All line entries are maintained in file address order.
    ///
    /// @param[in] line_entry
    ///     A const reference to a new line_entry to add to this line
    ///     table.
    ///
    /// @see Address::DumpStyle
    //------------------------------------------------------------------
//  void
//  AddLineEntry (const LineEntry& line_entry);

    // Called when you can't guarantee the addresses are in increasing order
    void
    InsertLineEntry (const lldb::SectionSP& section_sp,
                     lldb::addr_t section_offset,
                     uint32_t line,
                     uint16_t column,
                     uint16_t file_idx,
                     bool is_start_of_statement,
                     bool is_start_of_basic_block,
                     bool is_prologue_end,
                     bool is_epilogue_begin,
                     bool is_terminal_entry);

    // Used to instantiate the LineSequence helper classw
    LineSequence*
    CreateLineSequenceContainer ();

    // Append an entry to a caller-provided collection that will later be
    // inserted in this line table.
    void
    AppendLineEntryToSequence (LineSequence* sequence,
                               const lldb::SectionSP& section_sp,
                               lldb::addr_t section_offset,
                               uint32_t line,
                               uint16_t column,
                               uint16_t file_idx,
                               bool is_start_of_statement,
                               bool is_start_of_basic_block,
                               bool is_prologue_end,
                               bool is_epilogue_begin,
                               bool is_terminal_entry);

    // Insert a sequence of entries into this line table.
    void
    InsertSequence (LineSequence* sequence);

    //------------------------------------------------------------------
    /// Dump all line entries in this line table to the stream \a s.
    ///
    /// @param[in] s
    ///     The stream to which to dump the object descripton.
    ///
    /// @param[in] style
    ///     The display style for the address.
    ///
    /// @see Address::DumpStyle
    //------------------------------------------------------------------
    void
    Dump (Stream *s, Target *target,
          Address::DumpStyle style,
          Address::DumpStyle fallback_style,
          bool show_line_ranges);

    void
    GetDescription (Stream *s,
                    Target *target,
                    lldb::DescriptionLevel level);

    //------------------------------------------------------------------
    /// Find a line entry that contains the section offset address \a
    /// so_addr.
    ///
    /// @param[in] so_addr
    ///     A section offset address object containing the address we
    ///     are searching for.
    ///
    /// @param[out] line_entry
    ///     A copy of the line entry that was found if \b true is
    ///     returned, otherwise \a entry is left unmodified.
    ///
    /// @param[out] index_ptr
    ///     A pointer to a 32 bit integer that will get the actual line
    ///     entry index if it is not NULL.
    ///
    /// @return
    ///     Returns \b true if \a so_addr is contained in a line entry
    ///     in this line table, \b false otherwise.
    //------------------------------------------------------------------
    bool
    FindLineEntryByAddress (const Address &so_addr, LineEntry& line_entry, uint32_t *index_ptr = NULL);

    //------------------------------------------------------------------
    /// Find a line entry index that has a matching file index and
    /// source line number.
    ///
    /// Finds the next line entry that has a matching \a file_idx and
    /// source line number \a line starting at the \a start_idx entries
    /// into the line entry collection.
    ///
    /// @param[in] start_idx
    ///     The number of entries to skip when starting the search.
    ///
    /// @param[out] file_idx
    ///     The file index to search for that should be found prior
    ///     to calling this function using the following functions:
    ///     CompileUnit::GetSupportFiles()
    ///     FileSpecList::FindFileIndex (uint32_t, const FileSpec &) const
    ///
    /// @param[in] line
    ///     The source line to match.
    ///
    /// @param[in] exact
    ///     If true, match only if you find a line entry exactly matching \a line.
    ///     If false, return the closest line entry greater than \a line.
    ///
    /// @param[out] line_entry
    ///     A reference to a line entry object that will get a copy of
    ///     the line entry if \b true is returned, otherwise \a
    ///     line_entry is left untouched.
    ///
    /// @return
    ///     Returns \b true if a matching line entry is found in this
    ///     line table, \b false otherwise.
    ///
    /// @see CompileUnit::GetSupportFiles()
    /// @see FileSpecList::FindFileIndex (uint32_t, const FileSpec &) const
    //------------------------------------------------------------------
    uint32_t
    FindLineEntryIndexByFileIndex (uint32_t start_idx,
                                   uint32_t file_idx,
                                   uint32_t line,
                                   bool exact,
                                   LineEntry* line_entry_ptr);

    uint32_t
    FindLineEntryIndexByFileIndex (uint32_t start_idx,
                                   const std::vector<uint32_t> &file_indexes,
                                   uint32_t line,
                                   bool exact,
                                   LineEntry* line_entry_ptr);

    size_t
    FineLineEntriesForFileIndex (uint32_t file_idx,
                                 bool append,
                                 SymbolContextList &sc_list);

    //------------------------------------------------------------------
    /// Get the line entry from the line table at index \a idx.
    ///
    /// @param[in] idx
    ///     An index into the line table entry collection.
    ///
    /// @return
    ///     A valid line entry if \a idx is a valid index, or an invalid
    ///     line entry if \a idx is not valid.
    ///
    /// @see LineTable::GetSize()
    /// @see LineEntry::IsValid() const
    //------------------------------------------------------------------
    bool
    GetLineEntryAtIndex(uint32_t idx, LineEntry& line_entry);

    //------------------------------------------------------------------
    /// Gets the size of the line table in number of line table entries.
    ///
    /// @return
    ///     The number of line table entries in this line table.
    //------------------------------------------------------------------
    uint32_t
    GetSize () const;

    typedef lldb_private::RangeArray<lldb::addr_t, lldb::addr_t, 32> FileAddressRanges;

    //------------------------------------------------------------------
    /// Gets all contiguous file address ranges for the entire line table.
    ///
    /// @param[out] file_ranges
    ///     A collection of file address ranges that will be filled in
    ///     by this function.
    ///
    /// @param[out] append
    ///     If \b true, then append to \a file_ranges, otherwise clear
    ///     \a file_ranges prior to adding any ranges.
    ///
    /// @return
    ///     The number of address ranges added to \a file_ranges
    //------------------------------------------------------------------
    size_t
    GetContiguousFileAddressRanges (FileAddressRanges &file_ranges, bool append);

protected:

    struct Entry
    {
        enum { kInvalidSectIdx = UINT32_MAX };

        Entry () :
            sect_idx (kInvalidSectIdx),
            sect_offset (0),
            line (0),
            column (0),
            file_idx (0),
            is_start_of_statement (false),
            is_start_of_basic_block (false),
            is_prologue_end (false),
            is_epilogue_begin (false),
            is_terminal_entry (false)
        {
        }

        Entry ( uint32_t _sect_idx,
                lldb::addr_t _sect_offset,
                uint32_t _line,
                uint16_t _column,
                uint16_t _file_idx,
                bool _is_start_of_statement,
                bool _is_start_of_basic_block,
                bool _is_prologue_end,
                bool _is_epilogue_begin,
                bool _is_terminal_entry) :
            sect_idx (_sect_idx),
            sect_offset (_sect_offset),
            line (_line),
            column (_column),
            file_idx (_file_idx),
            is_start_of_statement (_is_start_of_statement),
            is_start_of_basic_block (_is_start_of_basic_block),
            is_prologue_end (_is_prologue_end),
            is_epilogue_begin (_is_epilogue_begin),
            is_terminal_entry (_is_terminal_entry)
        {
            // We have reserved 32 bits for the section offset which should
            // be enough, but if it isn't then we need to make m_section_offset
            // bigger
            assert(_sect_offset <= UINT32_MAX);
        }

        int
        bsearch_compare (const void *key, const void *arrmem);

        void
        Clear ()
        {
            sect_idx = kInvalidSectIdx;
            sect_offset = 0;
            line = 0;
            column = 0;
            file_idx = 0;
            is_start_of_statement = false;
            is_start_of_basic_block = false;
            is_prologue_end = false;
            is_epilogue_begin = false;
            is_terminal_entry = false;
        }

        static int
        Compare (const Entry& lhs, const Entry& rhs)
        {
            // Compare the sections before calling
            #define SCALAR_COMPARE(a,b) if (a < b) return -1; if (a > b) return +1
            SCALAR_COMPARE (lhs.sect_offset, rhs.sect_offset);
            SCALAR_COMPARE (lhs.line, rhs.line);
            SCALAR_COMPARE (lhs.column, rhs.column);
            SCALAR_COMPARE (lhs.is_start_of_statement, rhs.is_start_of_statement);
            SCALAR_COMPARE (lhs.is_start_of_basic_block, rhs.is_start_of_basic_block);
            // rhs and lhs reversed on purpose below.
            SCALAR_COMPARE (rhs.is_prologue_end, lhs.is_prologue_end);
            SCALAR_COMPARE (lhs.is_epilogue_begin, rhs.is_epilogue_begin);
            // rhs and lhs reversed on purpose below.
            SCALAR_COMPARE (rhs.is_terminal_entry, lhs.is_terminal_entry);
            SCALAR_COMPARE (lhs.file_idx, rhs.file_idx);
            #undef SCALAR_COMPARE
            return 0;
        }


        class LessThanBinaryPredicate
        {
        public:
            LessThanBinaryPredicate(LineTable *line_table);
            bool operator() (const LineTable::Entry&, const LineTable::Entry&) const;
        protected:
            LineTable *m_line_table;
        };

        static bool EntryAddressLessThan (const Entry& lhs, const Entry& rhs)
        {
            if (lhs.sect_idx == rhs.sect_idx)
                return lhs.sect_offset < rhs.sect_offset;
            return lhs.sect_idx < rhs.sect_idx;
        }

        //------------------------------------------------------------------
        // Member variables.
        //------------------------------------------------------------------
        uint32_t    sect_idx;                   ///< The section index for this line entry.
        uint32_t    sect_offset;                ///< The offset into the section for this line entry.
        uint32_t    line;                       ///< The source line number, or zero if there is no line number information.
        uint16_t    column;                     ///< The column number of the source line, or zero if there is no column information.
        uint16_t    file_idx:11,                ///< The file index into CompileUnit's file table, or zero if there is no file information.
                    is_start_of_statement:1,    ///< Indicates this entry is the beginning of a statement.
                    is_start_of_basic_block:1,  ///< Indicates this entry is the beginning of a basic block.
                    is_prologue_end:1,          ///< Indicates this entry is one (of possibly many) where execution should be suspended for an entry breakpoint of a function.
                    is_epilogue_begin:1,        ///< Indicates this entry is one (of possibly many) where execution should be suspended for an exit breakpoint of a function.
                    is_terminal_entry:1;        ///< Indicates this entry is that of the first byte after the end of a sequence of target machine instructions.
    };

    struct EntrySearchInfo
    {
        LineTable* line_table;
        lldb_private::Section *a_section;
        Entry *a_entry;
    };

    //------------------------------------------------------------------
    // Types
    //------------------------------------------------------------------
    typedef std::vector<lldb_private::Section*> section_collection; ///< The collection type for the sections.
    typedef std::vector<Entry>                  entry_collection;   ///< The collection type for the line entries.
    //------------------------------------------------------------------
    // Member variables.
    //------------------------------------------------------------------
    CompileUnit* m_comp_unit;   ///< The compile unit that this line table belongs to.
    SectionList m_section_list; ///< The list of sections that at least one of the line entries exists in.
    entry_collection m_entries; ///< The collection of line entries in this line table.

    //------------------------------------------------------------------
    // Helper class
    //------------------------------------------------------------------
    class LineSequenceImpl : public LineSequence
    {
    public:
        LineSequenceImpl() :
            LineSequence()
        {}

        virtual
        ~LineSequenceImpl()
        {}

        virtual void
        Clear();

        entry_collection m_seq_entries; ///< The collection of line entries in this sequence.
    };

    bool
    ConvertEntryAtIndexToLineEntry (uint32_t idx, LineEntry &line_entry);

    lldb_private::Section *
    GetSectionForEntryIndex (uint32_t idx);
private:
    DISALLOW_COPY_AND_ASSIGN (LineTable);
};

} // namespace lldb_private

#endif  // liblldb_LineTable_h_