08052afa2d
IRMemoryMap rather than through its own memory
abstraction. This considerably simplifies the
code, and makes it possible to run the
IRInterpreter multiple times on an already-parsed
expression in the absence of a ClangExpressionDeclMap.
Changes include:
- ClangExpressionDeclMap's interface methods
for the IRInterpreter now take IRMemoryMap
arguments. They are not long for this world,
however, since the IRInterpreter will soon be
working with materialized variables.
- As mentioned above, removed the Memory class
from the IR interpreter altogether. It had a
few functions that remain useful, such as
keeping track of Values that have been placed
in memory, so I moved those into methods on
InterpreterStackFrame.
- Changed IRInterpreter to work with lldb::addr_t
rather than Memory::Region as its primary
currency.
- Fixed a bug in the IRMemoryMap where it did not
report correct address byte size and byte order
if no process was present, because it was using
Target::GetDefaultArchitecture() rather than
Target::GetArchitecture().
- Made IRMemoryMap methods clear the Errors they
receive before running. Having to do this by
hand is just annoying.
The testsuite seems happy with these changes, but
please let me know if you see problems (especially
in use cases without a process).
llvm-svn: 179675
659 lines
20 KiB
C++
659 lines
20 KiB
C++
//===-- IRMemoryMap.cpp -----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Core/DataBufferHeap.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Error.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Core/Scalar.h"
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#include "lldb/Expression/IRMemoryMap.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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using namespace lldb_private;
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IRMemoryMap::IRMemoryMap (lldb::TargetSP target_sp) :
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m_target_wp(target_sp)
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{
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if (target_sp)
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m_process_wp = target_sp->GetProcessSP();
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}
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IRMemoryMap::~IRMemoryMap ()
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{
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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{
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for (AllocationMap::value_type &allocation : m_allocations)
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{
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if (allocation.second.m_policy == eAllocationPolicyMirror ||
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allocation.second.m_policy == eAllocationPolicyHostOnly)
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process_sp->DeallocateMemory(allocation.second.m_process_alloc);
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if (lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS))
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{
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log->Printf("IRMemoryMap::~IRMemoryMap deallocated [0x%llx..0x%llx)",
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(uint64_t)allocation.second.m_process_start,
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(uint64_t)allocation.second.m_process_start + (uint64_t)allocation.second.m_size);
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}
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}
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}
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}
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lldb::addr_t
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IRMemoryMap::FindSpace (size_t size)
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{
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// Yup, this is just plain O(n) insertion. We'll use a range tree if we
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// start caring.
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lldb::addr_t remote_address = 0x1000; // skip first page of memory
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for (AllocationMap::value_type &allocation : m_allocations)
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{
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if (remote_address < allocation.second.m_process_start &&
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remote_address + size <= allocation.second.m_process_start)
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return remote_address;
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remote_address = allocation.second.m_process_start + allocation.second.m_size;
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}
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if (remote_address + size < remote_address)
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return LLDB_INVALID_ADDRESS; // massively unlikely
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return remote_address;
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}
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bool
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IRMemoryMap::ContainsHostOnlyAllocations ()
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{
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for (AllocationMap::value_type &allocation : m_allocations)
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{
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if (allocation.second.m_policy == eAllocationPolicyHostOnly)
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return true;
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}
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return false;
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}
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IRMemoryMap::AllocationMap::iterator
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IRMemoryMap::FindAllocation (lldb::addr_t addr, size_t size)
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{
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AllocationMap::iterator iter = m_allocations.lower_bound (addr);
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if (iter == m_allocations.end() ||
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iter->first > addr)
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{
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if (iter == m_allocations.begin())
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return m_allocations.end();
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iter--;
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}
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if (iter->first <= addr && iter->first + iter->second.m_size >= addr + size)
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return iter;
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return m_allocations.end();
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}
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lldb::ByteOrder
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IRMemoryMap::GetByteOrder()
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{
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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return process_sp->GetByteOrder();
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lldb::TargetSP target_sp = m_target_wp.lock();
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if (target_sp)
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return target_sp->GetArchitecture().GetByteOrder();
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return lldb::eByteOrderInvalid;
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}
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uint32_t
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IRMemoryMap::GetAddressByteSize()
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{
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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return process_sp->GetAddressByteSize();
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lldb::TargetSP target_sp = m_target_wp.lock();
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if (target_sp)
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return target_sp->GetArchitecture().GetAddressByteSize();
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return UINT32_MAX;
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}
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ExecutionContextScope *
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IRMemoryMap::GetBestExecutionContextScope()
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{
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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return process_sp.get();
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lldb::TargetSP target_sp = m_target_wp.lock();
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if (target_sp)
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return target_sp.get();
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return NULL;
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}
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lldb::addr_t
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IRMemoryMap::Malloc (size_t size, uint8_t alignment, uint32_t permissions, AllocationPolicy policy, Error &error)
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{
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error.Clear();
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lldb::ProcessSP process_sp;
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lldb::addr_t allocation_address = LLDB_INVALID_ADDRESS;
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lldb::addr_t aligned_address = LLDB_INVALID_ADDRESS;
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size_t allocation_size = (size ? size : 1) + alignment - 1;
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switch (policy)
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{
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default:
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't malloc: invalid allocation policy");
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return LLDB_INVALID_ADDRESS;
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case eAllocationPolicyHostOnly:
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allocation_address = FindSpace(allocation_size);
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if (allocation_address == LLDB_INVALID_ADDRESS)
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't malloc: address space is full");
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return LLDB_INVALID_ADDRESS;
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}
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break;
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case eAllocationPolicyMirror:
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if (ContainsHostOnlyAllocations())
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't malloc: host-only allocations are polluting the address space");
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return LLDB_INVALID_ADDRESS;
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}
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process_sp = m_process_wp.lock();
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if (process_sp)
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{
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allocation_address = process_sp->AllocateMemory(allocation_size, permissions, error);
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if (!error.Success())
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return LLDB_INVALID_ADDRESS;
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}
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else
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{
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allocation_address = FindSpace(allocation_size);
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if (allocation_address == LLDB_INVALID_ADDRESS)
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't malloc: address space is full");
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return LLDB_INVALID_ADDRESS;
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}
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}
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break;
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case eAllocationPolicyProcessOnly:
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if (ContainsHostOnlyAllocations())
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't malloc: host-only allocations are polluting the address space");
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return LLDB_INVALID_ADDRESS;
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}
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process_sp = m_process_wp.lock();
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if (process_sp)
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{
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allocation_address = process_sp->AllocateMemory(allocation_size, permissions, error);
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if (!error.Success())
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return LLDB_INVALID_ADDRESS;
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}
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else
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't malloc: process doesn't exist, and this memory must be in the process");
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return LLDB_INVALID_ADDRESS;
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}
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break;
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}
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lldb::addr_t mask = alignment - 1;
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aligned_address = (allocation_address + mask) & (~mask);
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Allocation &allocation(m_allocations[aligned_address]);
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allocation.m_process_alloc = allocation_address;
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allocation.m_process_start = aligned_address;
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allocation.m_size = size;
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allocation.m_permissions = permissions;
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allocation.m_alignment = alignment;
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allocation.m_policy = policy;
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switch (policy)
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{
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default:
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assert (0 && "We cannot reach this!");
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case eAllocationPolicyHostOnly:
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allocation.m_data.reset(new DataBufferHeap(size, 0));
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break;
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case eAllocationPolicyProcessOnly:
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break;
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case eAllocationPolicyMirror:
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allocation.m_data.reset(new DataBufferHeap(size, 0));
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break;
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}
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if (lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS))
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{
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const char * policy_string;
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switch (policy)
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{
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default:
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policy_string = "<invalid policy>";
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break;
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case eAllocationPolicyHostOnly:
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policy_string = "eAllocationPolicyHostOnly";
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break;
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case eAllocationPolicyProcessOnly:
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policy_string = "eAllocationPolicyProcessOnly";
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break;
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case eAllocationPolicyMirror:
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policy_string = "eAllocationPolicyMirror";
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break;
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}
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log->Printf("IRMemoryMap::Malloc (%llu, 0x%llx, 0x%llx, %s) -> 0x%llx",
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(uint64_t)size,
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(uint64_t)alignment,
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(uint64_t)permissions,
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policy_string,
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aligned_address);
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}
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return aligned_address;
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}
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void
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IRMemoryMap::Free (lldb::addr_t process_address, Error &error)
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{
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error.Clear();
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AllocationMap::iterator iter = m_allocations.find(process_address);
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if (iter == m_allocations.end())
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't free: allocation doesn't exist");
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return;
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}
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Allocation &allocation = iter->second;
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switch (allocation.m_policy)
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{
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default:
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case eAllocationPolicyHostOnly:
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break;
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case eAllocationPolicyMirror:
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case eAllocationPolicyProcessOnly:
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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process_sp->DeallocateMemory(allocation.m_process_alloc);
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}
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if (lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS))
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{
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log->Printf("IRMemoryMap::Free (0x%llx) freed [0x%llx..0x%llx)",
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(uint64_t)process_address,
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iter->second.m_process_start,
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iter->second.m_process_start + iter->second.m_size);
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}
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m_allocations.erase(iter);
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}
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void
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IRMemoryMap::WriteMemory (lldb::addr_t process_address, const uint8_t *bytes, size_t size, Error &error)
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{
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error.Clear();
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AllocationMap::iterator iter = FindAllocation(process_address, size);
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if (iter == m_allocations.end())
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{
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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{
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process_sp->WriteMemory(process_address, bytes, size, error);
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return;
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}
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't write: no allocation contains the target range and the process doesn't exist");
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return;
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}
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Allocation &allocation = iter->second;
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uint64_t offset = process_address - allocation.m_process_start;
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lldb::ProcessSP process_sp;
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switch (allocation.m_policy)
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{
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default:
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't write: invalid allocation policy");
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return;
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case eAllocationPolicyHostOnly:
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if (!allocation.m_data)
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't write: data buffer is empty");
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return;
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}
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::memcpy (allocation.m_data->GetBytes() + offset, bytes, size);
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break;
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case eAllocationPolicyMirror:
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if (!allocation.m_data)
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't write: data buffer is empty");
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return;
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}
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::memcpy (allocation.m_data->GetBytes() + offset, bytes, size);
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process_sp = m_process_wp.lock();
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if (process_sp)
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{
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process_sp->WriteMemory(process_address, bytes, size, error);
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if (!error.Success())
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return;
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}
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break;
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case eAllocationPolicyProcessOnly:
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process_sp = m_process_wp.lock();
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if (process_sp)
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{
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process_sp->WriteMemory(process_address, bytes, size, error);
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if (!error.Success())
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return;
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}
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break;
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}
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if (lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS))
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{
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log->Printf("IRMemoryMap::WriteMemory (0x%llx, 0x%llx, 0x%lld) went to [0x%llx..0x%llx)",
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(uint64_t)process_address,
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(uint64_t)bytes,
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(uint64_t)size,
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(uint64_t)allocation.m_process_start,
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(uint64_t)allocation.m_process_start + (uint64_t)allocation.m_size);
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}
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}
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void
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IRMemoryMap::WriteScalarToMemory (lldb::addr_t process_address, Scalar &scalar, size_t size, Error &error)
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{
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error.Clear();
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if (size == UINT32_MAX)
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size = scalar.GetByteSize();
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if (size > 0)
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{
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uint8_t buf[32];
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const size_t mem_size = scalar.GetAsMemoryData (buf, size, GetByteOrder(), error);
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if (mem_size > 0)
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{
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return WriteMemory(process_address, buf, mem_size, error);
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}
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else
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{
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error.SetErrorToGenericError();
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error.SetErrorString ("Couldn't write scalar: failed to get scalar as memory data");
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}
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}
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else
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{
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error.SetErrorToGenericError();
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error.SetErrorString ("Couldn't write scalar: its size was zero");
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}
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return;
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}
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void
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IRMemoryMap::WritePointerToMemory (lldb::addr_t process_address, lldb::addr_t address, Error &error)
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{
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error.Clear();
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Scalar scalar(address);
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WriteScalarToMemory(process_address, scalar, GetAddressByteSize(), error);
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}
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void
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IRMemoryMap::ReadMemory (uint8_t *bytes, lldb::addr_t process_address, size_t size, Error &error)
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{
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error.Clear();
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AllocationMap::iterator iter = FindAllocation(process_address, size);
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if (iter == m_allocations.end())
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{
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lldb::ProcessSP process_sp = m_process_wp.lock();
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if (process_sp)
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{
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process_sp->ReadMemory(process_address, bytes, size, error);
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return;
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}
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lldb::TargetSP target_sp = m_target_wp.lock();
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if (target_sp)
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{
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Address absolute_address(process_address);
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target_sp->ReadMemory(absolute_address, false, bytes, size, error);
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return;
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}
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't read: no allocation contains the target range, and neither the process nor the target exist");
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return;
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}
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Allocation &allocation = iter->second;
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uint64_t offset = process_address - allocation.m_process_start;
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lldb::ProcessSP process_sp;
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switch (allocation.m_policy)
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{
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default:
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't read: invalid allocation policy");
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return;
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case eAllocationPolicyHostOnly:
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if (!allocation.m_data)
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't read: data buffer is empty");
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return;
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}
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::memcpy (bytes, allocation.m_data->GetBytes() + offset, size);
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break;
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case eAllocationPolicyMirror:
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process_sp = m_process_wp.lock();
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if (process_sp)
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{
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process_sp->ReadMemory(process_address, bytes, size, error);
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if (!error.Success())
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return;
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}
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else
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{
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if (!allocation.m_data)
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{
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error.SetErrorToGenericError();
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error.SetErrorString("Couldn't read: data buffer is empty");
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return;
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}
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::memcpy (bytes, allocation.m_data->GetBytes() + offset, size);
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}
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break;
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case eAllocationPolicyProcessOnly:
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process_sp = m_process_wp.lock();
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if (process_sp)
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{
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process_sp->ReadMemory(process_address, bytes, size, error);
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if (!error.Success())
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return;
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}
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break;
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}
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if (lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS))
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{
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log->Printf("IRMemoryMap::ReadMemory (0x%llx, 0x%llx, 0x%lld) came from [0x%llx..0x%llx)",
|
|
(uint64_t)process_address,
|
|
(uint64_t)bytes,
|
|
(uint64_t)size,
|
|
(uint64_t)allocation.m_process_start,
|
|
(uint64_t)allocation.m_process_start + (uint64_t)allocation.m_size);
|
|
}
|
|
}
|
|
|
|
void
|
|
IRMemoryMap::ReadScalarFromMemory (Scalar &scalar, lldb::addr_t process_address, size_t size, Error &error)
|
|
{
|
|
error.Clear();
|
|
|
|
if (size > 0)
|
|
{
|
|
DataBufferHeap buf(size, 0);
|
|
ReadMemory(buf.GetBytes(), process_address, size, error);
|
|
|
|
if (!error.Success())
|
|
return;
|
|
|
|
DataExtractor extractor(buf.GetBytes(), buf.GetByteSize(), GetByteOrder(), GetAddressByteSize());
|
|
|
|
lldb::offset_t offset = 0;
|
|
|
|
switch (size)
|
|
{
|
|
default:
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorStringWithFormat("Couldn't read scalar: unsupported size %lld", (unsigned long long)size);
|
|
return;
|
|
case 1: scalar = extractor.GetU8(&offset); break;
|
|
case 2: scalar = extractor.GetU16(&offset); break;
|
|
case 4: scalar = extractor.GetU32(&offset); break;
|
|
case 8: scalar = extractor.GetU64(&offset); break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString ("Couldn't read scalar: its size was zero");
|
|
}
|
|
return;
|
|
}
|
|
|
|
void
|
|
IRMemoryMap::ReadPointerFromMemory (lldb::addr_t *address, lldb::addr_t process_address, Error &error)
|
|
{
|
|
error.Clear();
|
|
|
|
Scalar pointer_scalar;
|
|
ReadScalarFromMemory(pointer_scalar, process_address, GetAddressByteSize(), error);
|
|
|
|
if (!error.Success())
|
|
return;
|
|
|
|
*address = pointer_scalar.ULongLong();
|
|
|
|
return;
|
|
}
|
|
|
|
void
|
|
IRMemoryMap::GetMemoryData (DataExtractor &extractor, lldb::addr_t process_address, size_t size, Error &error)
|
|
{
|
|
error.Clear();
|
|
|
|
if (size > 0)
|
|
{
|
|
AllocationMap::iterator iter = FindAllocation(process_address, size);
|
|
|
|
if (iter == m_allocations.end())
|
|
{
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorStringWithFormat("Couldn't find an allocation containing [0x%llx..0x%llx)", (unsigned long long)process_address, (unsigned long long)(process_address + size));
|
|
return;
|
|
}
|
|
|
|
Allocation &allocation = iter->second;
|
|
|
|
switch (allocation.m_policy)
|
|
{
|
|
default:
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString("Couldn't get memory data: invalid allocation policy");
|
|
return;
|
|
case eAllocationPolicyProcessOnly:
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString("Couldn't get memory data: memory is only in the target");
|
|
return;
|
|
case eAllocationPolicyMirror:
|
|
{
|
|
lldb::ProcessSP process_sp = m_process_wp.lock();
|
|
|
|
if (!allocation.m_data.get())
|
|
{
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString("Couldn't get memory data: data buffer is empty");
|
|
return;
|
|
}
|
|
if (process_sp)
|
|
{
|
|
process_sp->ReadMemory(allocation.m_process_start, allocation.m_data->GetBytes(), allocation.m_data->GetByteSize(), error);
|
|
if (!error.Success())
|
|
return;
|
|
uint64_t offset = process_address - allocation.m_process_start;
|
|
extractor = DataExtractor(allocation.m_data->GetBytes() + offset, size, GetByteOrder(), GetAddressByteSize());
|
|
return;
|
|
}
|
|
}
|
|
case eAllocationPolicyHostOnly:
|
|
if (!allocation.m_data.get())
|
|
{
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString("Couldn't get memory data: data buffer is empty");
|
|
return;
|
|
}
|
|
uint64_t offset = process_address - allocation.m_process_start;
|
|
extractor = DataExtractor(allocation.m_data->GetBytes() + offset, size, GetByteOrder(), GetAddressByteSize());
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString ("Couldn't get memory data: its size was zero");
|
|
return;
|
|
}
|
|
}
|
|
|
|
|