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https://github.com/intel/llvm.git
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f760f5aef4
Summary: instead of returning the architecture through by-ref argument and a boolean value indicating success, we can just return the ArchSpec directly. Since the ArchSpec already has an invalid state, it can be used to denote the failure without the additional bool. Reviewers: clayborg, zturner, espindola Subscribers: emaste, arichardson, JDevlieghere, lldb-commits Differential Revision: https://reviews.llvm.org/D56129 llvm-svn: 350291
480 lines
19 KiB
C++
480 lines
19 KiB
C++
//===-- FuncUnwinders.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/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/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/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/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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using namespace lldb;
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using namespace lldb_private;
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//------------------------------------------------
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/// constructor
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//------------------------------------------------
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FuncUnwinders::FuncUnwinders(UnwindTable &unwind_table, AddressRange range)
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: m_unwind_table(unwind_table), m_range(range), m_mutex(),
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m_unwind_plan_assembly_sp(), m_unwind_plan_eh_frame_sp(),
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m_unwind_plan_eh_frame_augmented_sp(), m_unwind_plan_compact_unwind(),
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m_unwind_plan_arm_unwind_sp(), m_unwind_plan_fast_sp(),
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m_unwind_plan_arch_default_sp(),
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m_unwind_plan_arch_default_at_func_entry_sp(),
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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_debug_frame(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), 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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//------------------------------------------------
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/// destructor
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//------------------------------------------------
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FuncUnwinders::~FuncUnwinders() {}
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UnwindPlanSP FuncUnwinders::GetUnwindPlanAtCallSite(Target &target,
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int current_offset) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (UnwindPlanSP plan_sp = GetEHFrameUnwindPlan(target, current_offset))
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return plan_sp;
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if (UnwindPlanSP plan_sp = GetDebugFrameUnwindPlan(target, current_offset))
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return plan_sp;
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if (UnwindPlanSP plan_sp = GetCompactUnwindUnwindPlan(target, current_offset))
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return plan_sp;
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if (UnwindPlanSP plan_sp = GetArmUnwindUnwindPlan(target, current_offset))
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return plan_sp;
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return nullptr;
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}
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UnwindPlanSP FuncUnwinders::GetCompactUnwindUnwindPlan(Target &target,
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int current_offset) {
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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 UnwindPlanSP();
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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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if (current_offset != -1)
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current_pc.SetOffset(current_pc.GetOffset() + current_offset);
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CompactUnwindInfo *compact_unwind = m_unwind_table.GetCompactUnwindInfo();
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if (compact_unwind) {
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UnwindPlanSP unwind_plan_sp(new 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 UnwindPlanSP();
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}
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UnwindPlanSP FuncUnwinders::GetEHFrameUnwindPlan(Target &target,
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int current_offset) {
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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_range.GetBaseAddress().IsValid()) {
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Address current_pc(m_range.GetBaseAddress());
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if (current_offset != -1)
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current_pc.SetOffset(current_pc.GetOffset() + current_offset);
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DWARFCallFrameInfo *eh_frame = m_unwind_table.GetEHFrameInfo();
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if (eh_frame) {
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m_unwind_plan_eh_frame_sp.reset(
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new UnwindPlan(lldb::eRegisterKindGeneric));
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if (!eh_frame->GetUnwindPlan(current_pc, *m_unwind_plan_eh_frame_sp))
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m_unwind_plan_eh_frame_sp.reset();
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}
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}
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return m_unwind_plan_eh_frame_sp;
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}
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UnwindPlanSP FuncUnwinders::GetDebugFrameUnwindPlan(Target &target,
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int current_offset) {
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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_range.GetBaseAddress().IsValid()) {
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Address current_pc(m_range.GetBaseAddress());
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if (current_offset != -1)
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current_pc.SetOffset(current_pc.GetOffset() + current_offset);
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DWARFCallFrameInfo *debug_frame = m_unwind_table.GetDebugFrameInfo();
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if (debug_frame) {
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m_unwind_plan_debug_frame_sp.reset(
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new UnwindPlan(lldb::eRegisterKindGeneric));
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if (!debug_frame->GetUnwindPlan(current_pc,
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*m_unwind_plan_debug_frame_sp))
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m_unwind_plan_debug_frame_sp.reset();
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}
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}
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return m_unwind_plan_debug_frame_sp;
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}
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UnwindPlanSP FuncUnwinders::GetArmUnwindUnwindPlan(Target &target,
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int current_offset) {
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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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if (current_offset != -1)
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current_pc.SetOffset(current_pc.GetOffset() + current_offset);
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ArmUnwindInfo *arm_unwind_info = m_unwind_table.GetArmUnwindInfo();
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if (arm_unwind_info) {
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m_unwind_plan_arm_unwind_sp.reset(
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new UnwindPlan(lldb::eRegisterKindGeneric));
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if (!arm_unwind_info->GetUnwindPlan(target, current_pc,
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*m_unwind_plan_arm_unwind_sp))
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m_unwind_plan_arm_unwind_sp.reset();
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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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UnwindPlanSP FuncUnwinders::GetEHFrameAugmentedUnwindPlan(Target &target,
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Thread &thread,
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int current_offset) {
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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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UnwindPlanSP eh_frame_plan = GetEHFrameUnwindPlan(target, current_offset);
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if (!eh_frame_plan)
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return m_unwind_plan_eh_frame_augmented_sp;
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m_unwind_plan_eh_frame_augmented_sp.reset(new UnwindPlan(*eh_frame_plan));
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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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if (!assembly_profiler_sp->AugmentUnwindPlanFromCallSite(
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m_range, thread, *m_unwind_plan_eh_frame_augmented_sp)) {
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m_unwind_plan_eh_frame_augmented_sp.reset();
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}
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} else {
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m_unwind_plan_eh_frame_augmented_sp.reset();
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}
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return m_unwind_plan_eh_frame_augmented_sp;
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}
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UnwindPlanSP
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FuncUnwinders::GetDebugFrameAugmentedUnwindPlan(Target &target, Thread &thread,
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int current_offset) {
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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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UnwindPlanSP debug_frame_plan =
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GetDebugFrameUnwindPlan(target, current_offset);
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if (!debug_frame_plan)
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return m_unwind_plan_debug_frame_augmented_sp;
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m_unwind_plan_debug_frame_augmented_sp.reset(
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new UnwindPlan(*debug_frame_plan));
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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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if (!assembly_profiler_sp->AugmentUnwindPlanFromCallSite(
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m_range, thread, *m_unwind_plan_debug_frame_augmented_sp)) {
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m_unwind_plan_debug_frame_augmented_sp.reset();
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}
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} else
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m_unwind_plan_debug_frame_augmented_sp.reset();
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return m_unwind_plan_debug_frame_augmented_sp;
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}
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UnwindPlanSP FuncUnwinders::GetAssemblyUnwindPlan(Target &target,
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Thread &thread,
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int current_offset) {
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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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UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
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if (assembly_profiler_sp) {
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m_unwind_plan_assembly_sp.reset(new UnwindPlan(lldb::eRegisterKindGeneric));
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if (!assembly_profiler_sp->GetNonCallSiteUnwindPlanFromAssembly(
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m_range, thread, *m_unwind_plan_assembly_sp)) {
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m_unwind_plan_assembly_sp.reset();
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}
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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 UnwindPlanSP &a, const UnwindPlanSP &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.get() && b.get()) {
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UnwindPlan::RowSP a_first_row = a->GetRowAtIndex(0);
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UnwindPlan::RowSP b_first_row = b->GetRowAtIndex(0);
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if (a_first_row.get() && b_first_row.get()) {
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UnwindPlan::Row::RegisterLocation a_pc_regloc;
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UnwindPlan::Row::RegisterLocation 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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UnwindPlanSP FuncUnwinders::GetUnwindPlanAtNonCallSite(Target &target,
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Thread &thread,
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int current_offset) {
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UnwindPlanSP eh_frame_sp = GetEHFrameUnwindPlan(target, current_offset);
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if (!eh_frame_sp)
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eh_frame_sp = GetDebugFrameUnwindPlan(target, current_offset);
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UnwindPlanSP arch_default_at_entry_sp =
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GetUnwindPlanArchitectureDefaultAtFunctionEntry(thread);
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UnwindPlanSP arch_default_sp = GetUnwindPlanArchitectureDefault(thread);
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UnwindPlanSP assembly_sp =
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GetAssemblyUnwindPlan(target, thread, current_offset);
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// This point of this code is to detect when a function is using a non-
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// standard ABI, and the eh_frame correctly describes that alternate ABI.
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// This is addressing a specific situation on x86_64 linux systems where one
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// function in a library pushes a value on the stack and jumps to another
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// function. So using an assembly instruction based unwind will not work
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// when you're in the second function - the stack has been modified in a non-
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// ABI way. But we have eh_frame that correctly describes how to unwind from
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// this location. So we're looking to see if the initial pc register save
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// location from the eh_frame is different from the assembly unwind, the arch
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// default unwind, and the arch default at initial function entry.
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//
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// We may have eh_frame that describes the entire function -- or we may have
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// eh_frame that only describes the unwind after the prologue has executed --
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// so we need to check both the arch default (once the prologue has executed)
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// and the arch default at initial function entry. And we may be running on
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// a target where we have only some of the assembly/arch default unwind plans
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// available.
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if (CompareUnwindPlansForIdenticalInitialPCLocation(
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thread, eh_frame_sp, arch_default_at_entry_sp) == eLazyBoolNo &&
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CompareUnwindPlansForIdenticalInitialPCLocation(
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thread, eh_frame_sp, arch_default_sp) == eLazyBoolNo &&
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CompareUnwindPlansForIdenticalInitialPCLocation(
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thread, assembly_sp, arch_default_sp) == eLazyBoolNo) {
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return eh_frame_sp;
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}
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if (UnwindPlanSP plan_sp =
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GetEHFrameAugmentedUnwindPlan(target, thread, current_offset))
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return plan_sp;
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if (UnwindPlanSP plan_sp =
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GetDebugFrameAugmentedUnwindPlan(target, thread, current_offset))
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return plan_sp;
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return assembly_sp;
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}
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UnwindPlanSP FuncUnwinders::GetUnwindPlanFastUnwind(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_fast_sp.get() || m_tried_unwind_fast)
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return m_unwind_plan_fast_sp;
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m_tried_unwind_fast = true;
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UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
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if (assembly_profiler_sp) {
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m_unwind_plan_fast_sp.reset(new UnwindPlan(lldb::eRegisterKindGeneric));
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if (!assembly_profiler_sp->GetFastUnwindPlan(m_range, thread,
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*m_unwind_plan_fast_sp)) {
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m_unwind_plan_fast_sp.reset();
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}
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}
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return m_unwind_plan_fast_sp;
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}
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UnwindPlanSP FuncUnwinders::GetUnwindPlanArchitectureDefault(Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_arch_default_sp.get() || m_tried_unwind_arch_default)
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return m_unwind_plan_arch_default_sp;
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m_tried_unwind_arch_default = true;
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Address current_pc;
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ProcessSP process_sp(thread.CalculateProcess());
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if (process_sp) {
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ABI *abi = process_sp->GetABI().get();
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if (abi) {
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m_unwind_plan_arch_default_sp.reset(
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new UnwindPlan(lldb::eRegisterKindGeneric));
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if (!abi->CreateDefaultUnwindPlan(*m_unwind_plan_arch_default_sp)) {
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m_unwind_plan_arch_default_sp.reset();
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}
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}
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}
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return m_unwind_plan_arch_default_sp;
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}
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UnwindPlanSP
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FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry(Thread &thread) {
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std::lock_guard<std::recursive_mutex> guard(m_mutex);
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if (m_unwind_plan_arch_default_at_func_entry_sp.get() ||
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m_tried_unwind_arch_default_at_func_entry)
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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) {
|
|
ABI *abi = process_sp->GetABI().get();
|
|
if (abi) {
|
|
m_unwind_plan_arch_default_at_func_entry_sp.reset(
|
|
new UnwindPlan(lldb::eRegisterKindGeneric));
|
|
if (!abi->CreateFunctionEntryUnwindPlan(
|
|
*m_unwind_plan_arch_default_at_func_entry_sp)) {
|
|
m_unwind_plan_arch_default_at_func_entry_sp.reset();
|
|
}
|
|
}
|
|
}
|
|
|
|
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_range.GetBaseAddress();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
Address FuncUnwinders::GetLSDAAddress(Target &target) {
|
|
Address lsda_addr;
|
|
|
|
UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan(target, -1);
|
|
if (unwind_plan_sp.get() == nullptr) {
|
|
unwind_plan_sp = GetCompactUnwindUnwindPlan(target, -1);
|
|
}
|
|
if (unwind_plan_sp.get() && unwind_plan_sp->GetLSDAAddress().IsValid()) {
|
|
lsda_addr = unwind_plan_sp->GetLSDAAddress();
|
|
}
|
|
return lsda_addr;
|
|
}
|
|
|
|
Address FuncUnwinders::GetPersonalityRoutinePtrAddress(Target &target) {
|
|
Address personality_addr;
|
|
|
|
UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan(target, -1);
|
|
if (unwind_plan_sp.get() == nullptr) {
|
|
unwind_plan_sp = GetCompactUnwindUnwindPlan(target, -1);
|
|
}
|
|
if (unwind_plan_sp.get() &&
|
|
unwind_plan_sp->GetPersonalityFunctionPtr().IsValid()) {
|
|
personality_addr = unwind_plan_sp->GetPersonalityFunctionPtr();
|
|
}
|
|
|
|
return personality_addr;
|
|
}
|