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llvm-project/lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.cpp
Jason Molenda f23bf7432c Add a new base class, Frame. It is a pure virtual function which 
defines a protocol that all subclasses will implement.  StackFrame
is currently the only subclass and the methods that Frame vends are
nearly identical to StackFrame's old methods.

Update all callers to use Frame*/Frame& instead of pointers to
StackFrames.

This is almost entirely a mechanical change that touches a lot of
the code base so I'm committing it alone.  No new functionality is
added with this patch, no new subclasses of Frame exist yet.

I'll probably need to tweak some of the separation, possibly moving
some of StackFrame's methods up in to Frame, but this is a good
starting point.

<rdar://problem/15314068>

llvm-svn: 193907
2013-11-02 02:23:02 +00:00

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9.0 KiB
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//===-- UnwindMacOSXFrameBackchain.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
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/ArchSpec.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "RegisterContextMacOSXFrameBackchain.h"
using namespace lldb;
using namespace lldb_private;
UnwindMacOSXFrameBackchain::UnwindMacOSXFrameBackchain (Thread &thread) :
Unwind (thread),
m_cursors()
{
}
uint32_t
UnwindMacOSXFrameBackchain::DoGetFrameCount()
{
if (m_cursors.empty())
{
ExecutionContext exe_ctx (m_thread.shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
if (target)
{
const ArchSpec& target_arch = target->GetArchitecture ();
// Frame zero should always be supplied by the thread...
exe_ctx.SetFrameSP (m_thread.GetStackFrameAtIndex (0));
if (target_arch.GetAddressByteSize() == 8)
GetStackFrameData_x86_64 (exe_ctx);
else
GetStackFrameData_i386 (exe_ctx);
}
}
return m_cursors.size();
}
bool
UnwindMacOSXFrameBackchain::DoGetFrameInfoAtIndex (uint32_t idx, addr_t& cfa, addr_t& pc)
{
const uint32_t frame_count = GetFrameCount();
if (idx < frame_count)
{
if (m_cursors[idx].pc == LLDB_INVALID_ADDRESS)
return false;
if (m_cursors[idx].fp == LLDB_INVALID_ADDRESS)
return false;
pc = m_cursors[idx].pc;
cfa = m_cursors[idx].fp;
return true;
}
return false;
}
lldb::RegisterContextSP
UnwindMacOSXFrameBackchain::DoCreateRegisterContextForFrame (Frame *frame)
{
lldb::RegisterContextSP reg_ctx_sp;
uint32_t concrete_idx = frame->GetConcreteFrameIndex ();
const uint32_t frame_count = GetFrameCount();
if (concrete_idx < frame_count)
reg_ctx_sp.reset (new RegisterContextMacOSXFrameBackchain (m_thread, concrete_idx, m_cursors[concrete_idx]));
return reg_ctx_sp;
}
size_t
UnwindMacOSXFrameBackchain::GetStackFrameData_i386 (const ExecutionContext &exe_ctx)
{
m_cursors.clear();
Frame *first_frame = exe_ctx.GetFramePtr();
Process *process = exe_ctx.GetProcessPtr();
if (process == NULL)
return 0;
std::pair<lldb::addr_t, lldb::addr_t> fp_pc_pair;
struct Frame_i386
{
uint32_t fp;
uint32_t pc;
};
RegisterContext *reg_ctx = m_thread.GetRegisterContext().get();
assert (reg_ctx);
Cursor cursor;
cursor.pc = reg_ctx->GetPC (LLDB_INVALID_ADDRESS);
cursor.fp = reg_ctx->GetFP (0);
Frame_i386 frame = { static_cast<uint32_t>(cursor.fp), static_cast<uint32_t>(cursor.pc) };
m_cursors.push_back(cursor);
const size_t k_frame_size = sizeof(frame);
Error error;
while (frame.fp != 0 && frame.pc != 0 && ((frame.fp & 7) == 0))
{
// Read both the FP and PC (8 bytes)
if (process->ReadMemory (frame.fp, &frame.fp, k_frame_size, error) != k_frame_size)
break;
if (frame.pc >= 0x1000)
{
cursor.pc = frame.pc;
cursor.fp = frame.fp;
m_cursors.push_back (cursor);
}
}
if (!m_cursors.empty())
{
lldb::addr_t first_frame_pc = m_cursors.front().pc;
if (first_frame_pc != LLDB_INVALID_ADDRESS)
{
const uint32_t resolve_scope = eSymbolContextModule |
eSymbolContextCompUnit |
eSymbolContextFunction |
eSymbolContextSymbol;
SymbolContext first_frame_sc (first_frame->GetSymbolContext(resolve_scope));
const AddressRange *addr_range_ptr = NULL;
AddressRange range;
if (first_frame_sc.function)
addr_range_ptr = &first_frame_sc.function->GetAddressRange();
else if (first_frame_sc.symbol)
{
range.GetBaseAddress() = first_frame_sc.symbol->GetAddress();
range.SetByteSize (first_frame_sc.symbol->GetByteSize());
addr_range_ptr = &range;
}
if (addr_range_ptr)
{
if (first_frame->GetFrameCodeAddress() == addr_range_ptr->GetBaseAddress())
{
// We are at the first instruction, so we can recover the
// previous PC by dereferencing the SP
lldb::addr_t first_frame_sp = reg_ctx->GetSP (0);
// Read the real second frame return address into frame.pc
if (first_frame_sp && process->ReadMemory (first_frame_sp, &frame.pc, sizeof(frame.pc), error) == sizeof(frame.pc))
{
cursor.fp = m_cursors.front().fp;
cursor.pc = frame.pc; // Set the new second frame PC
// Insert the second frame
m_cursors.insert(m_cursors.begin()+1, cursor);
m_cursors.front().fp = first_frame_sp;
}
}
}
}
}
// uint32_t i=0;
// printf(" PC FP\n");
// printf(" ------------------ ------------------ \n");
// for (i=0; i<m_cursors.size(); ++i)
// {
// printf("[%3u] 0x%16.16" PRIx64 " 0x%16.16" PRIx64 "\n", i, m_cursors[i].pc, m_cursors[i].fp);
// }
return m_cursors.size();
}
size_t
UnwindMacOSXFrameBackchain::GetStackFrameData_x86_64 (const ExecutionContext &exe_ctx)
{
m_cursors.clear();
Process *process = exe_ctx.GetProcessPtr();
if (process == NULL)
return 0;
Frame *first_frame = exe_ctx.GetFramePtr();
std::pair<lldb::addr_t, lldb::addr_t> fp_pc_pair;
struct Frame_x86_64
{
uint64_t fp;
uint64_t pc;
};
RegisterContext *reg_ctx = m_thread.GetRegisterContext().get();
assert (reg_ctx);
Cursor cursor;
cursor.pc = reg_ctx->GetPC (LLDB_INVALID_ADDRESS);
cursor.fp = reg_ctx->GetFP (0);
Frame_x86_64 frame = { cursor.fp, cursor.pc };
m_cursors.push_back(cursor);
Error error;
const size_t k_frame_size = sizeof(frame);
while (frame.fp != 0 && frame.pc != 0 && ((frame.fp & 7) == 0))
{
// Read both the FP and PC (16 bytes)
if (process->ReadMemory (frame.fp, &frame.fp, k_frame_size, error) != k_frame_size)
break;
if (frame.pc >= 0x1000)
{
cursor.pc = frame.pc;
cursor.fp = frame.fp;
m_cursors.push_back (cursor);
}
}
if (!m_cursors.empty())
{
lldb::addr_t first_frame_pc = m_cursors.front().pc;
if (first_frame_pc != LLDB_INVALID_ADDRESS)
{
const uint32_t resolve_scope = eSymbolContextModule |
eSymbolContextCompUnit |
eSymbolContextFunction |
eSymbolContextSymbol;
SymbolContext first_frame_sc(first_frame->GetSymbolContext(resolve_scope));
const AddressRange *addr_range_ptr = NULL;
AddressRange range;
if (first_frame_sc.function)
addr_range_ptr = &first_frame_sc.function->GetAddressRange();
else if (first_frame_sc.symbol)
{
range.GetBaseAddress() = first_frame_sc.symbol->GetAddress();
range.SetByteSize (first_frame_sc.symbol->GetByteSize());
addr_range_ptr = &range;
}
if (addr_range_ptr)
{
if (first_frame->GetFrameCodeAddress() == addr_range_ptr->GetBaseAddress())
{
// We are at the first instruction, so we can recover the
// previous PC by dereferencing the SP
lldb::addr_t first_frame_sp = reg_ctx->GetSP (0);
// Read the real second frame return address into frame.pc
if (process->ReadMemory (first_frame_sp, &frame.pc, sizeof(frame.pc), error) == sizeof(frame.pc))
{
cursor.fp = m_cursors.front().fp;
cursor.pc = frame.pc; // Set the new second frame PC
// Insert the second frame
m_cursors.insert(m_cursors.begin()+1, cursor);
m_cursors.front().fp = first_frame_sp;
}
}
}
}
}
return m_cursors.size();
}
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