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663 lines
22 KiB
663 lines
22 KiB
//===-- Function.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/Function.h"
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#include "lldb/Core/Disassembler.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleList.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Symbol/CompileUnit.h"
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#include "lldb/Symbol/CompilerType.h"
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#include "lldb/Symbol/LineTable.h"
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#include "lldb/Symbol/SymbolFile.h"
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#include "lldb/Target/Language.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/Log.h"
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#include "llvm/Support/Casting.h"
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using namespace lldb;
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using namespace lldb_private;
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// Basic function information is contained in the FunctionInfo class. It is
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// designed to contain the name, linkage name, and declaration location.
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FunctionInfo::FunctionInfo(const char *name, const Declaration *decl_ptr)
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: m_name(name), m_declaration(decl_ptr) {}
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FunctionInfo::FunctionInfo(ConstString name, const Declaration *decl_ptr)
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: m_name(name), m_declaration(decl_ptr) {}
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FunctionInfo::~FunctionInfo() {}
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void FunctionInfo::Dump(Stream *s, bool show_fullpaths) const {
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if (m_name)
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*s << ", name = \"" << m_name << "\"";
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m_declaration.Dump(s, show_fullpaths);
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}
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int FunctionInfo::Compare(const FunctionInfo &a, const FunctionInfo &b) {
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int result = ConstString::Compare(a.GetName(), b.GetName());
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if (result)
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return result;
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return Declaration::Compare(a.m_declaration, b.m_declaration);
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}
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Declaration &FunctionInfo::GetDeclaration() { return m_declaration; }
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const Declaration &FunctionInfo::GetDeclaration() const {
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return m_declaration;
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}
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ConstString FunctionInfo::GetName() const { return m_name; }
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size_t FunctionInfo::MemorySize() const {
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return m_name.MemorySize() + m_declaration.MemorySize();
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}
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InlineFunctionInfo::InlineFunctionInfo(const char *name,
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llvm::StringRef mangled,
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const Declaration *decl_ptr,
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const Declaration *call_decl_ptr)
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: FunctionInfo(name, decl_ptr), m_mangled(mangled),
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m_call_decl(call_decl_ptr) {}
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InlineFunctionInfo::InlineFunctionInfo(ConstString name,
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const Mangled &mangled,
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const Declaration *decl_ptr,
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const Declaration *call_decl_ptr)
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: FunctionInfo(name, decl_ptr), m_mangled(mangled),
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m_call_decl(call_decl_ptr) {}
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InlineFunctionInfo::~InlineFunctionInfo() {}
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void InlineFunctionInfo::Dump(Stream *s, bool show_fullpaths) const {
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FunctionInfo::Dump(s, show_fullpaths);
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if (m_mangled)
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m_mangled.Dump(s);
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}
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void InlineFunctionInfo::DumpStopContext(Stream *s) const {
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// s->Indent("[inlined] ");
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s->Indent();
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if (m_mangled)
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s->PutCString(m_mangled.GetName().AsCString());
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else
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s->PutCString(m_name.AsCString());
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}
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ConstString InlineFunctionInfo::GetName() const {
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if (m_mangled)
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return m_mangled.GetName();
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return m_name;
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}
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ConstString InlineFunctionInfo::GetDisplayName() const {
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if (m_mangled)
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return m_mangled.GetDisplayDemangledName();
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return m_name;
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}
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Declaration &InlineFunctionInfo::GetCallSite() { return m_call_decl; }
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const Declaration &InlineFunctionInfo::GetCallSite() const {
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return m_call_decl;
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}
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Mangled &InlineFunctionInfo::GetMangled() { return m_mangled; }
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const Mangled &InlineFunctionInfo::GetMangled() const { return m_mangled; }
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size_t InlineFunctionInfo::MemorySize() const {
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return FunctionInfo::MemorySize() + m_mangled.MemorySize();
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}
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/// @name Call site related structures
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/// @{
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lldb::addr_t CallEdge::GetLoadAddress(lldb::addr_t unresolved_pc,
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Function &caller, Target &target) {
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
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const Address &caller_start_addr = caller.GetAddressRange().GetBaseAddress();
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ModuleSP caller_module_sp = caller_start_addr.GetModule();
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if (!caller_module_sp) {
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LLDB_LOG(log, "GetLoadAddress: cannot get Module for caller");
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return LLDB_INVALID_ADDRESS;
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}
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SectionList *section_list = caller_module_sp->GetSectionList();
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if (!section_list) {
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LLDB_LOG(log, "GetLoadAddress: cannot get SectionList for Module");
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return LLDB_INVALID_ADDRESS;
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}
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Address the_addr = Address(unresolved_pc, section_list);
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lldb::addr_t load_addr = the_addr.GetLoadAddress(&target);
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return load_addr;
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}
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lldb::addr_t CallEdge::GetReturnPCAddress(Function &caller,
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Target &target) const {
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return GetLoadAddress(GetUnresolvedReturnPCAddress(), caller, target);
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}
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void DirectCallEdge::ParseSymbolFileAndResolve(ModuleList &images) {
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if (resolved)
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return;
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
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LLDB_LOG(log, "DirectCallEdge: Lazily parsing the call graph for {0}",
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lazy_callee.symbol_name);
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auto resolve_lazy_callee = [&]() -> Function * {
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ConstString callee_name{lazy_callee.symbol_name};
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SymbolContextList sc_list;
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images.FindFunctionSymbols(callee_name, eFunctionNameTypeAuto, sc_list);
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size_t num_matches = sc_list.GetSize();
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if (num_matches == 0 || !sc_list[0].symbol) {
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LLDB_LOG(log,
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"DirectCallEdge: Found no symbols for {0}, cannot resolve it",
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callee_name);
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return nullptr;
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}
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Address callee_addr = sc_list[0].symbol->GetAddress();
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if (!callee_addr.IsValid()) {
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LLDB_LOG(log, "DirectCallEdge: Invalid symbol address");
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return nullptr;
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}
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Function *f = callee_addr.CalculateSymbolContextFunction();
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if (!f) {
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LLDB_LOG(log, "DirectCallEdge: Could not find complete function");
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return nullptr;
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}
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return f;
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};
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lazy_callee.def = resolve_lazy_callee();
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resolved = true;
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}
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Function *DirectCallEdge::GetCallee(ModuleList &images, ExecutionContext &) {
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ParseSymbolFileAndResolve(images);
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assert(resolved && "Did not resolve lazy callee");
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return lazy_callee.def;
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}
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Function *IndirectCallEdge::GetCallee(ModuleList &images,
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ExecutionContext &exe_ctx) {
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
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Status error;
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Value callee_addr_val;
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if (!call_target.Evaluate(&exe_ctx, exe_ctx.GetRegisterContext(),
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/*loclist_base_addr=*/LLDB_INVALID_ADDRESS,
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/*initial_value_ptr=*/nullptr,
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/*object_address_ptr=*/nullptr, callee_addr_val,
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&error)) {
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LLDB_LOGF(log, "IndirectCallEdge: Could not evaluate expression: %s",
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error.AsCString());
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return nullptr;
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}
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addr_t raw_addr = callee_addr_val.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
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if (raw_addr == LLDB_INVALID_ADDRESS) {
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LLDB_LOG(log, "IndirectCallEdge: Could not extract address from scalar");
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return nullptr;
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}
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Address callee_addr;
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if (!exe_ctx.GetTargetPtr()->ResolveLoadAddress(raw_addr, callee_addr)) {
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LLDB_LOG(log, "IndirectCallEdge: Could not resolve callee's load address");
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return nullptr;
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}
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Function *f = callee_addr.CalculateSymbolContextFunction();
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if (!f) {
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LLDB_LOG(log, "IndirectCallEdge: Could not find complete function");
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return nullptr;
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}
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return f;
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}
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/// @}
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//
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Function::Function(CompileUnit *comp_unit, lldb::user_id_t func_uid,
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lldb::user_id_t type_uid, const Mangled &mangled, Type *type,
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const AddressRange &range)
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: UserID(func_uid), m_comp_unit(comp_unit), m_type_uid(type_uid),
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m_type(type), m_mangled(mangled), m_block(func_uid), m_range(range),
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m_frame_base(), m_flags(), m_prologue_byte_size(0) {
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m_block.SetParentScope(this);
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assert(comp_unit != nullptr);
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}
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Function::~Function() {}
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void Function::GetStartLineSourceInfo(FileSpec &source_file,
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uint32_t &line_no) {
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line_no = 0;
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source_file.Clear();
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if (m_comp_unit == nullptr)
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return;
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// Initialize m_type if it hasn't been initialized already
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GetType();
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if (m_type != nullptr && m_type->GetDeclaration().GetLine() != 0) {
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source_file = m_type->GetDeclaration().GetFile();
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line_no = m_type->GetDeclaration().GetLine();
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} else {
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LineTable *line_table = m_comp_unit->GetLineTable();
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if (line_table == nullptr)
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return;
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LineEntry line_entry;
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if (line_table->FindLineEntryByAddress(GetAddressRange().GetBaseAddress(),
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line_entry, nullptr)) {
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line_no = line_entry.line;
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source_file = line_entry.file;
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}
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}
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}
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void Function::GetEndLineSourceInfo(FileSpec &source_file, uint32_t &line_no) {
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line_no = 0;
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source_file.Clear();
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// The -1 is kind of cheesy, but I want to get the last line entry for the
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// given function, not the first entry of the next.
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Address scratch_addr(GetAddressRange().GetBaseAddress());
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scratch_addr.SetOffset(scratch_addr.GetOffset() +
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GetAddressRange().GetByteSize() - 1);
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LineTable *line_table = m_comp_unit->GetLineTable();
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if (line_table == nullptr)
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return;
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LineEntry line_entry;
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if (line_table->FindLineEntryByAddress(scratch_addr, line_entry, nullptr)) {
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line_no = line_entry.line;
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source_file = line_entry.file;
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}
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}
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llvm::ArrayRef<std::unique_ptr<CallEdge>> Function::GetCallEdges() {
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std::lock_guard<std::mutex> guard(m_call_edges_lock);
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if (m_call_edges_resolved)
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return m_call_edges;
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
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LLDB_LOG(log, "GetCallEdges: Attempting to parse call site info for {0}",
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GetDisplayName());
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m_call_edges_resolved = true;
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// Find the SymbolFile which provided this function's definition.
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Block &block = GetBlock(/*can_create*/true);
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SymbolFile *sym_file = block.GetSymbolFile();
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if (!sym_file)
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return llvm::None;
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// Lazily read call site information from the SymbolFile.
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m_call_edges = sym_file->ParseCallEdgesInFunction(GetID());
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// Sort the call edges to speed up return_pc lookups.
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llvm::sort(m_call_edges, [](const std::unique_ptr<CallEdge> &LHS,
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const std::unique_ptr<CallEdge> &RHS) {
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return LHS->GetSortKey() < RHS->GetSortKey();
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});
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return m_call_edges;
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}
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llvm::ArrayRef<std::unique_ptr<CallEdge>> Function::GetTailCallingEdges() {
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// Tail calling edges are sorted at the end of the list. Find them by dropping
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// all non-tail-calls.
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return GetCallEdges().drop_until(
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[](const std::unique_ptr<CallEdge> &edge) { return edge->IsTailCall(); });
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}
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CallEdge *Function::GetCallEdgeForReturnAddress(addr_t return_pc,
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Target &target) {
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auto edges = GetCallEdges();
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auto edge_it =
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llvm::partition_point(edges, [&](const std::unique_ptr<CallEdge> &edge) {
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return std::make_pair(edge->IsTailCall(),
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edge->GetReturnPCAddress(*this, target)) <
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std::make_pair(false, return_pc);
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});
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if (edge_it == edges.end() ||
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edge_it->get()->GetReturnPCAddress(*this, target) != return_pc)
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return nullptr;
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return edge_it->get();
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}
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Block &Function::GetBlock(bool can_create) {
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if (!m_block.BlockInfoHasBeenParsed() && can_create) {
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ModuleSP module_sp = CalculateSymbolContextModule();
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if (module_sp) {
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module_sp->GetSymbolFile()->ParseBlocksRecursive(*this);
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} else {
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Host::SystemLog(Host::eSystemLogError,
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"error: unable to find module "
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"shared pointer for function '%s' "
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"in %s\n",
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GetName().GetCString(),
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m_comp_unit->GetPrimaryFile().GetPath().c_str());
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}
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m_block.SetBlockInfoHasBeenParsed(true, true);
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}
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return m_block;
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}
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CompileUnit *Function::GetCompileUnit() { return m_comp_unit; }
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const CompileUnit *Function::GetCompileUnit() const { return m_comp_unit; }
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void Function::GetDescription(Stream *s, lldb::DescriptionLevel level,
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Target *target) {
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ConstString name = GetName();
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ConstString mangled = m_mangled.GetMangledName();
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*s << "id = " << (const UserID &)*this;
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if (name)
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s->AsRawOstream() << ", name = \"" << name << '"';
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if (mangled)
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s->AsRawOstream() << ", mangled = \"" << mangled << '"';
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*s << ", range = ";
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Address::DumpStyle fallback_style;
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if (level == eDescriptionLevelVerbose)
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fallback_style = Address::DumpStyleModuleWithFileAddress;
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else
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fallback_style = Address::DumpStyleFileAddress;
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GetAddressRange().Dump(s, target, Address::DumpStyleLoadAddress,
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fallback_style);
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}
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void Function::Dump(Stream *s, bool show_context) const {
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s->Printf("%p: ", static_cast<const void *>(this));
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s->Indent();
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*s << "Function" << static_cast<const UserID &>(*this);
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m_mangled.Dump(s);
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if (m_type)
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s->Printf(", type = %p", static_cast<void *>(m_type));
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else if (m_type_uid != LLDB_INVALID_UID)
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s->Printf(", type_uid = 0x%8.8" PRIx64, m_type_uid);
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s->EOL();
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// Dump the root object
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if (m_block.BlockInfoHasBeenParsed())
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m_block.Dump(s, m_range.GetBaseAddress().GetFileAddress(), INT_MAX,
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show_context);
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}
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void Function::CalculateSymbolContext(SymbolContext *sc) {
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sc->function = this;
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m_comp_unit->CalculateSymbolContext(sc);
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}
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ModuleSP Function::CalculateSymbolContextModule() {
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SectionSP section_sp(m_range.GetBaseAddress().GetSection());
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if (section_sp)
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return section_sp->GetModule();
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return this->GetCompileUnit()->GetModule();
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}
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CompileUnit *Function::CalculateSymbolContextCompileUnit() {
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return this->GetCompileUnit();
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}
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Function *Function::CalculateSymbolContextFunction() { return this; }
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lldb::DisassemblerSP Function::GetInstructions(const ExecutionContext &exe_ctx,
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const char *flavor,
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bool prefer_file_cache) {
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ModuleSP module_sp(GetAddressRange().GetBaseAddress().GetModule());
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if (module_sp && exe_ctx.HasTargetScope()) {
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const bool prefer_file_cache = false;
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return Disassembler::DisassembleRange(module_sp->GetArchitecture(), nullptr,
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flavor, exe_ctx.GetTargetRef(),
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GetAddressRange(), prefer_file_cache);
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}
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return lldb::DisassemblerSP();
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}
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bool Function::GetDisassembly(const ExecutionContext &exe_ctx,
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const char *flavor, bool prefer_file_cache,
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Stream &strm) {
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lldb::DisassemblerSP disassembler_sp =
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GetInstructions(exe_ctx, flavor, prefer_file_cache);
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if (disassembler_sp) {
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const bool show_address = true;
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const bool show_bytes = false;
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disassembler_sp->GetInstructionList().Dump(&strm, show_address, show_bytes,
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&exe_ctx);
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return true;
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}
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return false;
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}
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// Symbol *
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// Function::CalculateSymbolContextSymbol ()
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//{
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// return // TODO: find the symbol for the function???
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//}
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void Function::DumpSymbolContext(Stream *s) {
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m_comp_unit->DumpSymbolContext(s);
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s->Printf(", Function{0x%8.8" PRIx64 "}", GetID());
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}
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size_t Function::MemorySize() const {
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size_t mem_size = sizeof(Function) + m_block.MemorySize();
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return mem_size;
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}
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bool Function::GetIsOptimized() {
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bool result = false;
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// Currently optimization is only indicted by the vendor extension
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// DW_AT_APPLE_optimized which is set on a compile unit level.
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if (m_comp_unit) {
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result = m_comp_unit->GetIsOptimized();
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}
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return result;
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}
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bool Function::IsTopLevelFunction() {
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bool result = false;
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if (Language *language = Language::FindPlugin(GetLanguage()))
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result = language->IsTopLevelFunction(*this);
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return result;
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}
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ConstString Function::GetDisplayName() const {
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return m_mangled.GetDisplayDemangledName();
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}
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CompilerDeclContext Function::GetDeclContext() {
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ModuleSP module_sp = CalculateSymbolContextModule();
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if (module_sp) {
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|
if (SymbolFile *sym_file = module_sp->GetSymbolFile())
|
|
return sym_file->GetDeclContextForUID(GetID());
|
|
}
|
|
return CompilerDeclContext();
|
|
}
|
|
|
|
Type *Function::GetType() {
|
|
if (m_type == nullptr) {
|
|
SymbolContext sc;
|
|
|
|
CalculateSymbolContext(&sc);
|
|
|
|
if (!sc.module_sp)
|
|
return nullptr;
|
|
|
|
SymbolFile *sym_file = sc.module_sp->GetSymbolFile();
|
|
|
|
if (sym_file == nullptr)
|
|
return nullptr;
|
|
|
|
m_type = sym_file->ResolveTypeUID(m_type_uid);
|
|
}
|
|
return m_type;
|
|
}
|
|
|
|
const Type *Function::GetType() const { return m_type; }
|
|
|
|
CompilerType Function::GetCompilerType() {
|
|
Type *function_type = GetType();
|
|
if (function_type)
|
|
return function_type->GetFullCompilerType();
|
|
return CompilerType();
|
|
}
|
|
|
|
uint32_t Function::GetPrologueByteSize() {
|
|
if (m_prologue_byte_size == 0 &&
|
|
m_flags.IsClear(flagsCalculatedPrologueSize)) {
|
|
m_flags.Set(flagsCalculatedPrologueSize);
|
|
LineTable *line_table = m_comp_unit->GetLineTable();
|
|
uint32_t prologue_end_line_idx = 0;
|
|
|
|
if (line_table) {
|
|
LineEntry first_line_entry;
|
|
uint32_t first_line_entry_idx = UINT32_MAX;
|
|
if (line_table->FindLineEntryByAddress(GetAddressRange().GetBaseAddress(),
|
|
first_line_entry,
|
|
&first_line_entry_idx)) {
|
|
// Make sure the first line entry isn't already the end of the prologue
|
|
addr_t prologue_end_file_addr = LLDB_INVALID_ADDRESS;
|
|
addr_t line_zero_end_file_addr = LLDB_INVALID_ADDRESS;
|
|
|
|
if (first_line_entry.is_prologue_end) {
|
|
prologue_end_file_addr =
|
|
first_line_entry.range.GetBaseAddress().GetFileAddress();
|
|
prologue_end_line_idx = first_line_entry_idx;
|
|
} else {
|
|
// Check the first few instructions and look for one that has
|
|
// is_prologue_end set to true.
|
|
const uint32_t last_line_entry_idx = first_line_entry_idx + 6;
|
|
for (uint32_t idx = first_line_entry_idx + 1;
|
|
idx < last_line_entry_idx; ++idx) {
|
|
LineEntry line_entry;
|
|
if (line_table->GetLineEntryAtIndex(idx, line_entry)) {
|
|
if (line_entry.is_prologue_end) {
|
|
prologue_end_file_addr =
|
|
line_entry.range.GetBaseAddress().GetFileAddress();
|
|
prologue_end_line_idx = idx;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we didn't find the end of the prologue in the line tables, then
|
|
// just use the end address of the first line table entry
|
|
if (prologue_end_file_addr == LLDB_INVALID_ADDRESS) {
|
|
// Check the first few instructions and look for one that has a line
|
|
// number that's different than the first entry.
|
|
uint32_t last_line_entry_idx = first_line_entry_idx + 6;
|
|
for (uint32_t idx = first_line_entry_idx + 1;
|
|
idx < last_line_entry_idx; ++idx) {
|
|
LineEntry line_entry;
|
|
if (line_table->GetLineEntryAtIndex(idx, line_entry)) {
|
|
if (line_entry.line != first_line_entry.line) {
|
|
prologue_end_file_addr =
|
|
line_entry.range.GetBaseAddress().GetFileAddress();
|
|
prologue_end_line_idx = idx;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (prologue_end_file_addr == LLDB_INVALID_ADDRESS) {
|
|
prologue_end_file_addr =
|
|
first_line_entry.range.GetBaseAddress().GetFileAddress() +
|
|
first_line_entry.range.GetByteSize();
|
|
prologue_end_line_idx = first_line_entry_idx;
|
|
}
|
|
}
|
|
|
|
const addr_t func_start_file_addr =
|
|
m_range.GetBaseAddress().GetFileAddress();
|
|
const addr_t func_end_file_addr =
|
|
func_start_file_addr + m_range.GetByteSize();
|
|
|
|
// Now calculate the offset to pass the subsequent line 0 entries.
|
|
uint32_t first_non_zero_line = prologue_end_line_idx;
|
|
while (true) {
|
|
LineEntry line_entry;
|
|
if (line_table->GetLineEntryAtIndex(first_non_zero_line,
|
|
line_entry)) {
|
|
if (line_entry.line != 0)
|
|
break;
|
|
}
|
|
if (line_entry.range.GetBaseAddress().GetFileAddress() >=
|
|
func_end_file_addr)
|
|
break;
|
|
|
|
first_non_zero_line++;
|
|
}
|
|
|
|
if (first_non_zero_line > prologue_end_line_idx) {
|
|
LineEntry first_non_zero_entry;
|
|
if (line_table->GetLineEntryAtIndex(first_non_zero_line,
|
|
first_non_zero_entry)) {
|
|
line_zero_end_file_addr =
|
|
first_non_zero_entry.range.GetBaseAddress().GetFileAddress();
|
|
}
|
|
}
|
|
|
|
// Verify that this prologue end file address in the function's address
|
|
// range just to be sure
|
|
if (func_start_file_addr < prologue_end_file_addr &&
|
|
prologue_end_file_addr < func_end_file_addr) {
|
|
m_prologue_byte_size = prologue_end_file_addr - func_start_file_addr;
|
|
}
|
|
|
|
if (prologue_end_file_addr < line_zero_end_file_addr &&
|
|
line_zero_end_file_addr < func_end_file_addr) {
|
|
m_prologue_byte_size +=
|
|
line_zero_end_file_addr - prologue_end_file_addr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return m_prologue_byte_size;
|
|
}
|
|
|
|
lldb::LanguageType Function::GetLanguage() const {
|
|
lldb::LanguageType lang = m_mangled.GuessLanguage();
|
|
if (lang != lldb::eLanguageTypeUnknown)
|
|
return lang;
|
|
|
|
if (m_comp_unit)
|
|
return m_comp_unit->GetLanguage();
|
|
|
|
return lldb::eLanguageTypeUnknown;
|
|
}
|
|
|
|
ConstString Function::GetName() const {
|
|
return m_mangled.GetName();
|
|
}
|
|
|
|
ConstString Function::GetNameNoArguments() const {
|
|
return m_mangled.GetName(Mangled::ePreferDemangledWithoutArguments);
|
|
}
|