d865f32fe8
This patch uses the previously build infrastructure to parse multiple FDE entries into a single unwind plan. There is one catch though: we parse only one FDE entry per unwind range. This is not fully correct because lldb coalesces adjecant address ranges, which means that something that originally looked like two separate address ranges (and two FDE entries) may get merged into one because if the linker decides to put the two ranges next to each other. In this case, we will ignore the second FDE entry. It would be more correct to try to parse another entry when the one we found turns out to be short, but I'm not doing this (yet), because: - this is how we've done things so far (although, monolithic functions are unlikely to have more than one FDE entry) - in cases where we don't have debug info or (full) symbol tables, we can end up with "symbols" which appear to span many megabytes (potentially, the whole module). If we tried to fill short FDE entries, we could end up parsing the entire eh_frame section in a single go. In a way, this would be more correct, but it would also probably be very slow. I haven't quite decided what to do about this case yet, though it's not particularly likely to happen in the "production" cases as typically the functions are split into two parts (hot/cold) instead of one part per basic block.
533 lines
21 KiB
C++
533 lines
21 KiB
C++
//===-- FuncUnwinders.cpp -------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Symbol/FuncUnwinders.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Core/AddressRange.h"
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#include "lldb/Symbol/ArmUnwindInfo.h"
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#include "lldb/Symbol/CallFrameInfo.h"
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#include "lldb/Symbol/CompactUnwindInfo.h"
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#include "lldb/Symbol/DWARFCallFrameInfo.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Symbol/SymbolFile.h"
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#include "lldb/Symbol/UnwindPlan.h"
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#include "lldb/Symbol/UnwindTable.h"
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#include "lldb/Target/ABI.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/RegisterNumber.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/UnwindAssembly.h"
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#include <memory>
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using namespace lldb;
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using namespace lldb_private;
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static AddressRange CollapseRanges(llvm::ArrayRef<AddressRange> ranges) {
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if (ranges.empty())
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return AddressRange();
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if (ranges.size() == 1)
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return ranges[0];
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Address lowest_addr = ranges[0].GetBaseAddress();
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addr_t highest_addr = lowest_addr.GetFileAddress() + ranges[0].GetByteSize();
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for (const AddressRange &range : ranges.drop_front()) {
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Address range_begin = range.GetBaseAddress();
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addr_t range_end = range_begin.GetFileAddress() + range.GetByteSize();
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if (range_begin.GetFileAddress() < lowest_addr.GetFileAddress())
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lowest_addr = range_begin;
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if (range_end > highest_addr)
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highest_addr = range_end;
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}
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return AddressRange(lowest_addr, highest_addr - lowest_addr.GetFileAddress());
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}
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FuncUnwinders::FuncUnwinders(UnwindTable &unwind_table, Address addr,
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AddressRanges ranges)
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: m_unwind_table(unwind_table), m_addr(std::move(addr)),
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m_ranges(std::move(ranges)), m_range(CollapseRanges(m_ranges)),
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m_tried_unwind_plan_assembly(false), m_tried_unwind_plan_eh_frame(false),
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m_tried_unwind_plan_object_file(false),
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m_tried_unwind_plan_debug_frame(false),
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m_tried_unwind_plan_object_file_augmented(false),
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m_tried_unwind_plan_eh_frame_augmented(false),
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m_tried_unwind_plan_debug_frame_augmented(false),
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m_tried_unwind_plan_compact_unwind(false),
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m_tried_unwind_plan_arm_unwind(false),
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m_tried_unwind_plan_symbol_file(false), m_tried_unwind_fast(false),
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m_tried_unwind_arch_default(false),
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m_tried_unwind_arch_default_at_func_entry(false),
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m_first_non_prologue_insn() {}
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/// destructor
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FuncUnwinders::~FuncUnwinders() = default;
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetUnwindPlanAtCallSite(Target &target, Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (std::shared_ptr<const UnwindPlan> plan_sp =
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GetObjectFileUnwindPlan(target))
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return plan_sp;
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if (std::shared_ptr<const UnwindPlan> plan_sp =
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GetSymbolFileUnwindPlan(thread))
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return plan_sp;
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if (std::shared_ptr<const UnwindPlan> plan_sp =
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GetDebugFrameUnwindPlan(target))
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return plan_sp;
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if (std::shared_ptr<const UnwindPlan> plan_sp = GetEHFrameUnwindPlan(target))
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return plan_sp;
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if (std::shared_ptr<const UnwindPlan> plan_sp =
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GetCompactUnwindUnwindPlan(target))
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return plan_sp;
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if (std::shared_ptr<const UnwindPlan> plan_sp =
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GetArmUnwindUnwindPlan(target))
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return plan_sp;
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return nullptr;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetCompactUnwindUnwindPlan(Target &target) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_compact_unwind.size() > 0)
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return m_unwind_plan_compact_unwind[0]; // FIXME support multiple compact
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// unwind plans for one func
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if (m_tried_unwind_plan_compact_unwind)
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return nullptr;
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m_tried_unwind_plan_compact_unwind = true;
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if (m_range.GetBaseAddress().IsValid()) {
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Address current_pc(m_range.GetBaseAddress());
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CompactUnwindInfo *compact_unwind = m_unwind_table.GetCompactUnwindInfo();
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if (compact_unwind) {
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auto unwind_plan_sp =
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std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
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if (compact_unwind->GetUnwindPlan(target, current_pc, *unwind_plan_sp)) {
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m_unwind_plan_compact_unwind.push_back(unwind_plan_sp);
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return m_unwind_plan_compact_unwind[0]; // FIXME support multiple
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// compact unwind plans for one
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// func
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}
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}
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}
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return nullptr;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetObjectFileUnwindPlan(Target &target) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_object_file_sp.get() ||
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m_tried_unwind_plan_object_file)
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return m_unwind_plan_object_file_sp;
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m_tried_unwind_plan_object_file = true;
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if (m_range.GetBaseAddress().IsValid()) {
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CallFrameInfo *object_file_frame = m_unwind_table.GetObjectFileUnwindInfo();
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if (object_file_frame) {
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auto plan_sp = std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
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if (object_file_frame->GetUnwindPlan(m_range, *plan_sp))
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m_unwind_plan_object_file_sp = std::move(plan_sp);
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}
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}
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return m_unwind_plan_object_file_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetEHFrameUnwindPlan(Target &target) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_eh_frame_sp.get() || m_tried_unwind_plan_eh_frame)
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return m_unwind_plan_eh_frame_sp;
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m_tried_unwind_plan_eh_frame = true;
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if (m_addr.IsValid()) {
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if (DWARFCallFrameInfo *eh_frame = m_unwind_table.GetEHFrameInfo())
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m_unwind_plan_eh_frame_sp = eh_frame->GetUnwindPlan(m_ranges, m_addr);
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}
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return m_unwind_plan_eh_frame_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetDebugFrameUnwindPlan(Target &target) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_debug_frame_sp || m_tried_unwind_plan_debug_frame)
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return m_unwind_plan_debug_frame_sp;
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m_tried_unwind_plan_debug_frame = true;
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if (!m_ranges.empty()) {
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if (DWARFCallFrameInfo *debug_frame = m_unwind_table.GetDebugFrameInfo())
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m_unwind_plan_debug_frame_sp =
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debug_frame->GetUnwindPlan(m_ranges, m_addr);
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}
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return m_unwind_plan_debug_frame_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetArmUnwindUnwindPlan(Target &target) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_arm_unwind_sp.get() || m_tried_unwind_plan_arm_unwind)
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return m_unwind_plan_arm_unwind_sp;
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m_tried_unwind_plan_arm_unwind = true;
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if (m_range.GetBaseAddress().IsValid()) {
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Address current_pc(m_range.GetBaseAddress());
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ArmUnwindInfo *arm_unwind_info = m_unwind_table.GetArmUnwindInfo();
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if (arm_unwind_info) {
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auto plan_sp = std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
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if (arm_unwind_info->GetUnwindPlan(target, current_pc, *plan_sp))
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m_unwind_plan_arm_unwind_sp = std::move(plan_sp);
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}
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}
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return m_unwind_plan_arm_unwind_sp;
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}
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namespace {
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class RegisterContextToInfo: public SymbolFile::RegisterInfoResolver {
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public:
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RegisterContextToInfo(RegisterContext &ctx) : m_ctx(ctx) {}
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const RegisterInfo *ResolveName(llvm::StringRef name) const override {
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return m_ctx.GetRegisterInfoByName(name);
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}
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const RegisterInfo *ResolveNumber(lldb::RegisterKind kind,
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uint32_t number) const override {
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return m_ctx.GetRegisterInfo(kind, number);
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}
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private:
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RegisterContext &m_ctx;
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};
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} // namespace
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetSymbolFileUnwindPlan(Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_symbol_file_sp.get() || m_tried_unwind_plan_symbol_file)
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return m_unwind_plan_symbol_file_sp;
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m_tried_unwind_plan_symbol_file = true;
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if (SymbolFile *symfile = m_unwind_table.GetSymbolFile()) {
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m_unwind_plan_symbol_file_sp = symfile->GetUnwindPlan(
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m_range.GetBaseAddress(),
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RegisterContextToInfo(*thread.GetRegisterContext()));
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}
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return m_unwind_plan_symbol_file_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetObjectFileAugmentedUnwindPlan(Target &target,
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Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_object_file_augmented_sp.get() ||
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m_tried_unwind_plan_object_file_augmented)
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return m_unwind_plan_object_file_augmented_sp;
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m_tried_unwind_plan_object_file_augmented = true;
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std::shared_ptr<const UnwindPlan> object_file_unwind_plan =
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GetObjectFileUnwindPlan(target);
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if (!object_file_unwind_plan)
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return m_unwind_plan_object_file_augmented_sp;
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// Augment the instructions with epilogue descriptions if necessary
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// so the UnwindPlan can be used at any instruction in the function.
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UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
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if (assembly_profiler_sp) {
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auto plan_sp = std::make_shared<UnwindPlan>(*object_file_unwind_plan);
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if (assembly_profiler_sp->AugmentUnwindPlanFromCallSite(m_range, thread,
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*plan_sp))
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m_unwind_plan_object_file_augmented_sp = std::move(plan_sp);
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}
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return m_unwind_plan_object_file_augmented_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetEHFrameAugmentedUnwindPlan(Target &target, Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_eh_frame_augmented_sp.get() ||
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m_tried_unwind_plan_eh_frame_augmented)
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return m_unwind_plan_eh_frame_augmented_sp;
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// Only supported on x86 architectures where we get eh_frame from the
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// compiler that describes the prologue instructions perfectly, and sometimes
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// the epilogue instructions too.
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if (target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_32_i386 &&
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target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64 &&
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target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64h) {
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m_tried_unwind_plan_eh_frame_augmented = true;
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return m_unwind_plan_eh_frame_augmented_sp;
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}
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m_tried_unwind_plan_eh_frame_augmented = true;
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std::shared_ptr<const UnwindPlan> eh_frame_plan =
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GetEHFrameUnwindPlan(target);
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if (!eh_frame_plan)
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return m_unwind_plan_eh_frame_augmented_sp;
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// Augment the eh_frame instructions with epilogue descriptions if necessary
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// so the UnwindPlan can be used at any instruction in the function.
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UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
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if (assembly_profiler_sp) {
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auto plan_sp = std::make_shared<UnwindPlan>(*eh_frame_plan);
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if (assembly_profiler_sp->AugmentUnwindPlanFromCallSite(m_range, thread,
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*plan_sp))
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m_unwind_plan_eh_frame_augmented_sp = std::move(plan_sp);
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}
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return m_unwind_plan_eh_frame_augmented_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetDebugFrameAugmentedUnwindPlan(Target &target,
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Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_debug_frame_augmented_sp.get() ||
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m_tried_unwind_plan_debug_frame_augmented)
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return m_unwind_plan_debug_frame_augmented_sp;
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// Only supported on x86 architectures where we get debug_frame from the
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// compiler that describes the prologue instructions perfectly, and sometimes
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// the epilogue instructions too.
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if (target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_32_i386 &&
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target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64 &&
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target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64h) {
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m_tried_unwind_plan_debug_frame_augmented = true;
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return m_unwind_plan_debug_frame_augmented_sp;
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}
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m_tried_unwind_plan_debug_frame_augmented = true;
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std::shared_ptr<const UnwindPlan> debug_frame_plan =
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GetDebugFrameUnwindPlan(target);
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if (!debug_frame_plan)
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return m_unwind_plan_debug_frame_augmented_sp;
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// Augment the debug_frame instructions with epilogue descriptions if
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// necessary so the UnwindPlan can be used at any instruction in the
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// function.
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UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
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if (assembly_profiler_sp) {
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auto plan_sp = std::make_shared<UnwindPlan>(*debug_frame_plan);
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if (assembly_profiler_sp->AugmentUnwindPlanFromCallSite(m_range, thread,
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*plan_sp))
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m_unwind_plan_debug_frame_augmented_sp = std::move(plan_sp);
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}
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return m_unwind_plan_debug_frame_augmented_sp;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetAssemblyUnwindPlan(Target &target, Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_assembly_sp.get() || m_tried_unwind_plan_assembly ||
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!m_unwind_table.GetAllowAssemblyEmulationUnwindPlans()) {
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return m_unwind_plan_assembly_sp;
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}
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m_tried_unwind_plan_assembly = true;
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// Don't analyze more than 10 megabytes of instructions,
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// if a function is legitimately larger than that, we'll
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// miss the epilogue instructions, but guard against a
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// bogusly large function and analyzing large amounts of
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// non-instruction data.
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AddressRange range = m_range;
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const addr_t func_size =
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std::min(range.GetByteSize(), (addr_t)1024 * 10 * 10);
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range.SetByteSize(func_size);
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UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
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if (assembly_profiler_sp) {
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auto plan_sp = std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
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if (assembly_profiler_sp->GetNonCallSiteUnwindPlanFromAssembly(
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range, thread, *plan_sp))
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m_unwind_plan_assembly_sp = std::move(plan_sp);
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}
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return m_unwind_plan_assembly_sp;
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}
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// This method compares the pc unwind rule in the first row of two UnwindPlans.
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// If they have the same way of getting the pc value (e.g. "CFA - 8" + "CFA is
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// sp"), then it will return LazyBoolTrue.
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LazyBool FuncUnwinders::CompareUnwindPlansForIdenticalInitialPCLocation(
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Thread &thread, const std::shared_ptr<const UnwindPlan> &a,
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const std::shared_ptr<const UnwindPlan> &b) {
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LazyBool plans_are_identical = eLazyBoolCalculate;
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RegisterNumber pc_reg(thread, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
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uint32_t pc_reg_lldb_regnum = pc_reg.GetAsKind(eRegisterKindLLDB);
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if (a && b) {
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const UnwindPlan::Row *a_first_row = a->GetRowAtIndex(0);
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const UnwindPlan::Row *b_first_row = b->GetRowAtIndex(0);
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if (a_first_row && b_first_row) {
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UnwindPlan::Row::AbstractRegisterLocation a_pc_regloc;
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UnwindPlan::Row::AbstractRegisterLocation b_pc_regloc;
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a_first_row->GetRegisterInfo(pc_reg_lldb_regnum, a_pc_regloc);
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b_first_row->GetRegisterInfo(pc_reg_lldb_regnum, b_pc_regloc);
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plans_are_identical = eLazyBoolYes;
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if (a_first_row->GetCFAValue() != b_first_row->GetCFAValue()) {
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plans_are_identical = eLazyBoolNo;
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}
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if (a_pc_regloc != b_pc_regloc) {
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plans_are_identical = eLazyBoolNo;
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}
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}
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}
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return plans_are_identical;
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}
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std::shared_ptr<const UnwindPlan>
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FuncUnwinders::GetUnwindPlanAtNonCallSite(Target &target, Thread &thread) {
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std::shared_ptr<const UnwindPlan> eh_frame_sp = GetEHFrameUnwindPlan(target);
|
|
if (!eh_frame_sp)
|
|
eh_frame_sp = GetDebugFrameUnwindPlan(target);
|
|
if (!eh_frame_sp)
|
|
eh_frame_sp = GetObjectFileUnwindPlan(target);
|
|
std::shared_ptr<const UnwindPlan> arch_default_at_entry_sp =
|
|
GetUnwindPlanArchitectureDefaultAtFunctionEntry(thread);
|
|
std::shared_ptr<const UnwindPlan> arch_default_sp =
|
|
GetUnwindPlanArchitectureDefault(thread);
|
|
std::shared_ptr<const UnwindPlan> assembly_sp =
|
|
GetAssemblyUnwindPlan(target, thread);
|
|
|
|
// This point of this code is to detect when a function is using a non-
|
|
// standard ABI, and the eh_frame correctly describes that alternate ABI.
|
|
// This is addressing a specific situation on x86_64 linux systems where one
|
|
// function in a library pushes a value on the stack and jumps to another
|
|
// function. So using an assembly instruction based unwind will not work
|
|
// when you're in the second function - the stack has been modified in a non-
|
|
// ABI way. But we have eh_frame that correctly describes how to unwind from
|
|
// this location. So we're looking to see if the initial pc register save
|
|
// location from the eh_frame is different from the assembly unwind, the arch
|
|
// default unwind, and the arch default at initial function entry.
|
|
//
|
|
// We may have eh_frame that describes the entire function -- or we may have
|
|
// eh_frame that only describes the unwind after the prologue has executed --
|
|
// so we need to check both the arch default (once the prologue has executed)
|
|
// and the arch default at initial function entry. And we may be running on
|
|
// a target where we have only some of the assembly/arch default unwind plans
|
|
// available.
|
|
|
|
if (CompareUnwindPlansForIdenticalInitialPCLocation(
|
|
thread, eh_frame_sp, arch_default_at_entry_sp) == eLazyBoolNo &&
|
|
CompareUnwindPlansForIdenticalInitialPCLocation(
|
|
thread, eh_frame_sp, arch_default_sp) == eLazyBoolNo &&
|
|
CompareUnwindPlansForIdenticalInitialPCLocation(
|
|
thread, assembly_sp, arch_default_sp) == eLazyBoolNo) {
|
|
return eh_frame_sp;
|
|
}
|
|
|
|
if (std::shared_ptr<const UnwindPlan> plan_sp =
|
|
GetSymbolFileUnwindPlan(thread))
|
|
return plan_sp;
|
|
if (std::shared_ptr<const UnwindPlan> plan_sp =
|
|
GetDebugFrameAugmentedUnwindPlan(target, thread))
|
|
return plan_sp;
|
|
if (std::shared_ptr<const UnwindPlan> plan_sp =
|
|
GetEHFrameAugmentedUnwindPlan(target, thread))
|
|
return plan_sp;
|
|
if (std::shared_ptr<const UnwindPlan> plan_sp =
|
|
GetObjectFileAugmentedUnwindPlan(target, thread))
|
|
return plan_sp;
|
|
|
|
return assembly_sp;
|
|
}
|
|
|
|
std::shared_ptr<const UnwindPlan>
|
|
FuncUnwinders::GetUnwindPlanFastUnwind(Target &target, Thread &thread) {
|
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
|
if (m_unwind_plan_fast_sp.get() || m_tried_unwind_fast)
|
|
return m_unwind_plan_fast_sp;
|
|
|
|
m_tried_unwind_fast = true;
|
|
|
|
UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
|
|
if (assembly_profiler_sp) {
|
|
auto plan_sp = std::make_shared<UnwindPlan>(lldb::eRegisterKindGeneric);
|
|
if (assembly_profiler_sp->GetFastUnwindPlan(m_range, thread, *plan_sp))
|
|
m_unwind_plan_fast_sp = std::move(plan_sp);
|
|
}
|
|
return m_unwind_plan_fast_sp;
|
|
}
|
|
|
|
std::shared_ptr<const UnwindPlan>
|
|
FuncUnwinders::GetUnwindPlanArchitectureDefault(Thread &thread) {
|
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
|
if (m_unwind_plan_arch_default_sp.get() || m_tried_unwind_arch_default)
|
|
return m_unwind_plan_arch_default_sp;
|
|
|
|
m_tried_unwind_arch_default = true;
|
|
|
|
ProcessSP process_sp(thread.CalculateProcess());
|
|
if (process_sp) {
|
|
if (ABI *abi = process_sp->GetABI().get())
|
|
m_unwind_plan_arch_default_sp = abi->CreateDefaultUnwindPlan();
|
|
}
|
|
|
|
return m_unwind_plan_arch_default_sp;
|
|
}
|
|
|
|
std::shared_ptr<const UnwindPlan>
|
|
FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry(Thread &thread) {
|
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
|
if (m_unwind_plan_arch_default_at_func_entry_sp.get() ||
|
|
m_tried_unwind_arch_default_at_func_entry)
|
|
return m_unwind_plan_arch_default_at_func_entry_sp;
|
|
|
|
m_tried_unwind_arch_default_at_func_entry = true;
|
|
|
|
Address current_pc;
|
|
ProcessSP process_sp(thread.CalculateProcess());
|
|
if (process_sp) {
|
|
if (ABI *abi = process_sp->GetABI().get()) {
|
|
m_unwind_plan_arch_default_at_func_entry_sp =
|
|
abi->CreateFunctionEntryUnwindPlan();
|
|
}
|
|
}
|
|
|
|
return m_unwind_plan_arch_default_at_func_entry_sp;
|
|
}
|
|
|
|
Address &FuncUnwinders::GetFirstNonPrologueInsn(Target &target) {
|
|
std::lock_guard<std::recursive_mutex> guard(m_mutex);
|
|
if (m_first_non_prologue_insn.IsValid())
|
|
return m_first_non_prologue_insn;
|
|
|
|
ExecutionContext exe_ctx(target.shared_from_this(), false);
|
|
UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
|
|
if (assembly_profiler_sp)
|
|
assembly_profiler_sp->FirstNonPrologueInsn(m_range, exe_ctx,
|
|
m_first_non_prologue_insn);
|
|
return m_first_non_prologue_insn;
|
|
}
|
|
|
|
const Address &FuncUnwinders::GetFunctionStartAddress() const { return m_addr; }
|
|
|
|
lldb::UnwindAssemblySP
|
|
FuncUnwinders::GetUnwindAssemblyProfiler(Target &target) {
|
|
UnwindAssemblySP assembly_profiler_sp;
|
|
if (ArchSpec arch = m_unwind_table.GetArchitecture()) {
|
|
arch.MergeFrom(target.GetArchitecture());
|
|
assembly_profiler_sp = UnwindAssembly::FindPlugin(arch);
|
|
}
|
|
return assembly_profiler_sp;
|
|
}
|