hanchenye-llvm-project/lldb/source/Breakpoint/BreakpointID.cpp

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


// C Includes
#include <stdio.h>

// C++ Includes
// Other libraries and framework includes
// Project includes

#include "lldb/Breakpoint/BreakpointID.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Core/Stream.h"

using namespace lldb;
using namespace lldb_private;

BreakpointID::BreakpointID (break_id_t bp_id, break_id_t loc_id) :
    m_break_id (bp_id),
    m_location_id (loc_id)
{
}

BreakpointID::~BreakpointID ()
{
}

const char *BreakpointID::g_range_specifiers[] = { "-", "to", "To", "TO", NULL };

// Tells whether or not STR is valid to use between two strings representing breakpoint IDs, to
// indicate a range of breakpoint IDs.  This is broken out into a separate function so that we can
// easily change or add to the format for specifying ID ranges at a later date.

bool
BreakpointID::IsRangeIdentifier (const char *str)
{
    int specifier_count = 0;
    for (int i = 0; g_range_specifiers[i] != NULL; ++i)
      ++specifier_count;

    for (int i = 0; i < specifier_count; ++i)
    {
      if (strcmp (g_range_specifiers[i], str) == 0)
            return true;
    }

  return false;
}

bool
BreakpointID::IsValidIDExpression (const char *str)
{
    break_id_t bp_id;
    break_id_t loc_id;
    BreakpointID::ParseCanonicalReference (str, &bp_id, &loc_id);

    if (bp_id == LLDB_INVALID_BREAK_ID)
        return false;
    else
        return true;
}

void
BreakpointID::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
    if (level == eDescriptionLevelVerbose)
        s->Printf("%p BreakpointID:", this);

    if (m_break_id == LLDB_INVALID_BREAK_ID)
        s->PutCString ("<invalid>");
    else if (m_location_id == LLDB_INVALID_BREAK_ID)
        s->Printf("%i", m_break_id);
    else
        s->Printf("%i.%i", m_break_id, m_location_id);
}

void
BreakpointID::GetCanonicalReference (Stream *s, break_id_t bp_id, break_id_t loc_id)
{
    if (bp_id == LLDB_INVALID_BREAK_ID)
        s->PutCString ("<invalid>");
    else if (loc_id == LLDB_INVALID_BREAK_ID)
        s->Printf("%i", bp_id);
    else
        s->Printf("%i.%i", bp_id, loc_id);
}

bool
BreakpointID::ParseCanonicalReference (const char *input, break_id_t *break_id_ptr, break_id_t *break_loc_id_ptr)
{
    *break_id_ptr = LLDB_INVALID_BREAK_ID;
    *break_loc_id_ptr = LLDB_INVALID_BREAK_ID;

    if (input == NULL || *input == '\0')
        return false;

    const char *format = "%i%n.%i%n";
    int chars_consumed_1 = 0;
    int chars_consumed_2 = 0;
    int n_items_parsed = ::sscanf (input,
                                   format,
                                   break_id_ptr,        // %i   parse the breakpoint ID
                                   &chars_consumed_1,   // %n   gets the number of characters parsed so far
                                   break_loc_id_ptr,    // %i   parse the breakpoint location ID
                                   &chars_consumed_2);  // %n   gets the number of characters parsed so far

    if ((n_items_parsed == 1 && input[chars_consumed_1] == '\0') ||
        (n_items_parsed == 2 && input[chars_consumed_2] == '\0'))
        return true;

    // Badly formatted canonical reference.
    *break_id_ptr = LLDB_INVALID_BREAK_ID;
    *break_loc_id_ptr = LLDB_INVALID_BREAK_ID;
    return false;
}