src/third_party/llvm-project/lldb/source/API/SBInstructionList.cpp

//===-- SBInstructionList.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/API/SBInstructionList.h"
#include "lldb/API/SBInstruction.h"
#include "lldb/API/SBAddress.h"
#include "lldb/API/SBStream.h"
#include "lldb/Core/Disassembler.h"
#include "lldb/Core/Module.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Utility/Stream.h"

using namespace lldb;
using namespace lldb_private;

SBInstructionList::SBInstructionList() : m_opaque_sp() {}

SBInstructionList::SBInstructionList(const SBInstructionList &rhs)
    : m_opaque_sp(rhs.m_opaque_sp) {}

const SBInstructionList &SBInstructionList::
operator=(const SBInstructionList &rhs) {
  if (this != &rhs)
    m_opaque_sp = rhs.m_opaque_sp;
  return *this;
}

SBInstructionList::~SBInstructionList() {}

bool SBInstructionList::IsValid() const { return m_opaque_sp.get() != NULL; }

size_t SBInstructionList::GetSize() {
  if (m_opaque_sp)
    return m_opaque_sp->GetInstructionList().GetSize();
  return 0;
}

SBInstruction SBInstructionList::GetInstructionAtIndex(uint32_t idx) {
  SBInstruction inst;
  if (m_opaque_sp && idx < m_opaque_sp->GetInstructionList().GetSize())
    inst.SetOpaque(
        m_opaque_sp,
        m_opaque_sp->GetInstructionList().GetInstructionAtIndex(idx));
  return inst;
}

size_t SBInstructionList::GetInstructionsCount(const SBAddress &start,
                                              const SBAddress &end, 
                                              bool canSetBreakpoint) {
  size_t num_instructions = GetSize();
  size_t i = 0;
  SBAddress addr;
  size_t lower_index = 0;
  size_t upper_index = 0;
  size_t instructions_to_skip = 0;
  for (i = 0; i < num_instructions; ++i) {
    addr = GetInstructionAtIndex(i).GetAddress();
    if (start == addr)
      lower_index = i;
    if (end == addr)
      upper_index = i;
  }
  if (canSetBreakpoint)
    for (i = lower_index; i <= upper_index; ++i) {
      SBInstruction insn = GetInstructionAtIndex(i);
      if (!insn.CanSetBreakpoint())
        ++instructions_to_skip;
    }
  return upper_index - lower_index - instructions_to_skip;
}

void SBInstructionList::Clear() { m_opaque_sp.reset(); }

void SBInstructionList::AppendInstruction(SBInstruction insn) {}

void SBInstructionList::SetDisassembler(const lldb::DisassemblerSP &opaque_sp) {
  m_opaque_sp = opaque_sp;
}

void SBInstructionList::Print(FILE *out) {
  if (out == NULL)
    return;
}

bool SBInstructionList::GetDescription(lldb::SBStream &description) {
  if (m_opaque_sp) {
    size_t num_instructions = GetSize();
    if (num_instructions) {
      // Call the ref() to make sure a stream is created if one deesn't exist
      // already inside description...
      Stream &sref = description.ref();
      const uint32_t max_opcode_byte_size =
          m_opaque_sp->GetInstructionList().GetMaxOpcocdeByteSize();
      FormatEntity::Entry format;
      FormatEntity::Parse("${addr}: ", format);
      SymbolContext sc;
      SymbolContext prev_sc;
      for (size_t i = 0; i < num_instructions; ++i) {
        Instruction *inst =
            m_opaque_sp->GetInstructionList().GetInstructionAtIndex(i).get();
        if (inst == NULL)
          break;

        const Address &addr = inst->GetAddress();
        prev_sc = sc;
        ModuleSP module_sp(addr.GetModule());
        if (module_sp) {
          module_sp->ResolveSymbolContextForAddress(
              addr, eSymbolContextEverything, sc);
        }

        inst->Dump(&sref, max_opcode_byte_size, true, false, NULL, &sc,
                   &prev_sc, &format, 0);
        sref.EOL();
      }
      return true;
    }
  }
  return false;
}

bool SBInstructionList::DumpEmulationForAllInstructions(const char *triple) {
  if (m_opaque_sp) {
    size_t len = GetSize();
    for (size_t i = 0; i < len; ++i) {
      if (!GetInstructionAtIndex((uint32_t)i).DumpEmulation(triple))
        return false;
    }
  }
  return true;
}