llvm-project/lldb/source/Breakpoint/Watchpoint.cpp

//===-- Watchpoint.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/Watchpoint.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Core/Stream.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/ThreadSpec.h"
#include "lldb/Target/ThreadPlanTestCondition.h"

using namespace lldb;
using namespace lldb_private;

Watchpoint::Watchpoint (lldb::addr_t addr, size_t size, bool hardware) :
    StoppointLocation (GetNextID(), addr, size, hardware),
    m_target(NULL),
    m_enabled(0),
    m_is_hardware(hardware),
    m_watch_read(0),
    m_watch_write(0),
    m_watch_was_read(0),
    m_watch_was_written(0),
    m_ignore_count(0),
    m_callback(NULL),
    m_callback_baton(NULL),
    m_decl_str(),
    m_error()
{
}

Watchpoint::~Watchpoint()
{
}

break_id_t
Watchpoint::GetNextID()
{
    static break_id_t g_next_ID = 0;
    return ++g_next_ID;
}

bool
Watchpoint::SetCallback (WatchpointHitCallback callback, void *callback_baton)
{
    m_callback = callback;
    m_callback_baton = callback_baton;
    return true;
}

void
Watchpoint::SetDeclInfo (std::string &str)
{
    m_decl_str = str;
    return;
}

// Override default impl of StoppointLocation::IsHardware() since m_is_hardware
// member field is more accurate.
bool
Watchpoint::IsHardware () const
{
    return m_is_hardware;
}

// RETURNS - true if we should stop at this breakpoint, false if we
// should continue.

bool
Watchpoint::ShouldStop (StoppointCallbackContext *context)
{
    IncrementHitCount();

    if (!IsEnabled())
        return false;

    if (GetHitCount() <= GetIgnoreCount())
        return false;

    return true;
}

void
Watchpoint::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
    DumpWithLevel(s, level);
    return;
}

void
Watchpoint::Dump(Stream *s) const
{
    DumpWithLevel(s, lldb::eDescriptionLevelBrief);
}

void
Watchpoint::DumpWithLevel(Stream *s, lldb::DescriptionLevel description_level) const
{
    if (s == NULL)
        return;

    assert(description_level >= lldb::eDescriptionLevelBrief &&
           description_level <= lldb::eDescriptionLevelVerbose);

    s->Printf("Watchpoint %u: addr = 0x%8.8llx size = %u state = %s type = %s%s",
              GetID(),
              GetLoadAddress(),
              m_byte_size,
              m_enabled ? "enabled" : "disabled",
              m_watch_read ? "r" : "",
              m_watch_write ? "w" : "");

    if (description_level >= lldb::eDescriptionLevelFull) {
        if (!m_decl_str.empty())
            s->Printf("\n    declare @ '%s'", m_decl_str.c_str());
        if (GetConditionText())
            s->Printf("\n    condition = '%s'", GetConditionText());
    }

    if (description_level >= lldb::eDescriptionLevelVerbose)
    {
        if (m_callback)
        {
            s->Printf("\n    hw_index = %i  hit_count = %-4u  ignore_count = %-4u  callback = %8p baton = %8p",
                      GetHardwareIndex(),
                      GetHitCount(),
                      GetIgnoreCount(),
                      m_callback,
                      m_callback_baton);
        }
        else
        {
            s->Printf("\n    hw_index = %i  hit_count = %-4u  ignore_count = %-4u",
                      GetHardwareIndex(),
                      GetHitCount(),
                      GetIgnoreCount());
        }
    }
}

bool
Watchpoint::IsEnabled() const
{
    return m_enabled;
}

void
Watchpoint::SetEnabled(bool enabled)
{
    if (!enabled)
        SetHardwareIndex(LLDB_INVALID_INDEX32);
    m_enabled = enabled;
}

void
Watchpoint::SetWatchpointType (uint32_t type)
{
    m_watch_read = (type & LLDB_WATCH_TYPE_READ) != 0;
    m_watch_write = (type & LLDB_WATCH_TYPE_WRITE) != 0;
}

bool
Watchpoint::WatchpointRead () const
{
    return m_watch_read != 0;
}
bool
Watchpoint::WatchpointWrite () const
{
    return m_watch_write != 0;
}
uint32_t
Watchpoint::GetIgnoreCount () const
{
    return m_ignore_count;
}

void
Watchpoint::SetIgnoreCount (uint32_t n)
{
    m_ignore_count = n;
}

bool
Watchpoint::InvokeCallback (StoppointCallbackContext *context)
{
    if (m_callback && context->is_synchronous)
    {
        uint32_t access = 0;
        if (m_watch_was_read)
            access |= LLDB_WATCH_TYPE_READ;
        if (m_watch_was_written)
            access |= LLDB_WATCH_TYPE_WRITE;
        return m_callback(m_callback_baton, context, GetID(), access);
    }
    else
        return true;
}

void 
Watchpoint::SetCondition (const char *condition)
{
    if (condition == NULL || condition[0] == '\0')
    {
        if (m_condition_ap.get())
            m_condition_ap.reset();
    }
    else
    {
        // Pass NULL for expr_prefix (no translation-unit level definitions).
        m_condition_ap.reset(new ClangUserExpression (condition, NULL, lldb::eLanguageTypeUnknown, ClangUserExpression::eResultTypeAny));
    }
}

const char *
Watchpoint::GetConditionText () const
{
    if (m_condition_ap.get())
        return m_condition_ap->GetUserText();
    else
        return NULL;
}