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d821c997aa
These three classes have no external dependencies, but they are used from various low-level APIs. Moving them down to Utility improves overall code layering (although it still does not break any particular dependency completely). The XCode project will need to be updated after this change. Differential Revision: https://reviews.llvm.org/D49740 llvm-svn: 339127
570 lines
22 KiB
C++
570 lines
22 KiB
C++
//===-- ItaniumABILanguageRuntime.cpp --------------------------------------*-
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//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 "ItaniumABILanguageRuntime.h"
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#include "lldb/Breakpoint/BreakpointLocation.h"
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#include "lldb/Core/Mangled.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Core/ValueObjectMemory.h"
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#include "lldb/Interpreter/CommandObject.h"
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#include "lldb/Interpreter/CommandObjectMultiword.h"
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#include "lldb/Interpreter/CommandReturnObject.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Symbol/SymbolFile.h"
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#include "lldb/Symbol/TypeList.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/SectionLoadList.h"
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#include "lldb/Target/StopInfo.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/Utility/ConstString.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Scalar.h"
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#include "lldb/Utility/Status.h"
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#include <vector>
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using namespace lldb;
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using namespace lldb_private;
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static const char *vtable_demangled_prefix = "vtable for ";
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bool ItaniumABILanguageRuntime::CouldHaveDynamicValue(ValueObject &in_value) {
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const bool check_cxx = true;
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const bool check_objc = false;
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return in_value.GetCompilerType().IsPossibleDynamicType(NULL, check_cxx,
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check_objc);
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}
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TypeAndOrName ItaniumABILanguageRuntime::GetTypeInfoFromVTableAddress(
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ValueObject &in_value, lldb::addr_t original_ptr,
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lldb::addr_t vtable_load_addr) {
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if (m_process && vtable_load_addr != LLDB_INVALID_ADDRESS) {
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// Find the symbol that contains the "vtable_load_addr" address
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Address vtable_addr;
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Target &target = m_process->GetTarget();
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if (!target.GetSectionLoadList().IsEmpty()) {
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if (target.GetSectionLoadList().ResolveLoadAddress(vtable_load_addr,
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vtable_addr)) {
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// See if we have cached info for this type already
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TypeAndOrName type_info = GetDynamicTypeInfo(vtable_addr);
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if (type_info)
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return type_info;
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SymbolContext sc;
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target.GetImages().ResolveSymbolContextForAddress(
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vtable_addr, eSymbolContextSymbol, sc);
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Symbol *symbol = sc.symbol;
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if (symbol != NULL) {
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const char *name =
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symbol->GetMangled()
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.GetDemangledName(lldb::eLanguageTypeC_plus_plus)
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.AsCString();
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if (name && strstr(name, vtable_demangled_prefix) == name) {
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Log *log(
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lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
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if (log)
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log->Printf("0x%16.16" PRIx64
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": static-type = '%s' has vtable symbol '%s'\n",
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original_ptr, in_value.GetTypeName().GetCString(),
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name);
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// We are a C++ class, that's good. Get the class name and look it
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// up:
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const char *class_name = name + strlen(vtable_demangled_prefix);
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// We know the class name is absolute, so tell FindTypes that by
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// prefixing it with the root namespace:
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std::string lookup_name("::");
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lookup_name.append(class_name);
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type_info.SetName(class_name);
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const bool exact_match = true;
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TypeList class_types;
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uint32_t num_matches = 0;
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// First look in the module that the vtable symbol came from and
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// look for a single exact match.
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llvm::DenseSet<SymbolFile *> searched_symbol_files;
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if (sc.module_sp) {
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num_matches = sc.module_sp->FindTypes(
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sc, ConstString(lookup_name), exact_match, 1,
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searched_symbol_files, class_types);
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}
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// If we didn't find a symbol, then move on to the entire module
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// list in the target and get as many unique matches as possible
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if (num_matches == 0) {
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num_matches = target.GetImages().FindTypes(
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sc, ConstString(lookup_name), exact_match, UINT32_MAX,
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searched_symbol_files, class_types);
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}
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lldb::TypeSP type_sp;
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if (num_matches == 0) {
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if (log)
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log->Printf("0x%16.16" PRIx64 ": is not dynamic\n",
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original_ptr);
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return TypeAndOrName();
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}
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if (num_matches == 1) {
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type_sp = class_types.GetTypeAtIndex(0);
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if (type_sp) {
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if (ClangASTContext::IsCXXClassType(
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type_sp->GetForwardCompilerType())) {
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if (log)
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log->Printf(
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"0x%16.16" PRIx64
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": static-type = '%s' has dynamic type: uid={0x%" PRIx64
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"}, type-name='%s'\n",
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original_ptr, in_value.GetTypeName().AsCString(),
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type_sp->GetID(), type_sp->GetName().GetCString());
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type_info.SetTypeSP(type_sp);
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}
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}
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} else if (num_matches > 1) {
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size_t i;
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if (log) {
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for (i = 0; i < num_matches; i++) {
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type_sp = class_types.GetTypeAtIndex(i);
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if (type_sp) {
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if (log)
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log->Printf(
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"0x%16.16" PRIx64
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": static-type = '%s' has multiple matching dynamic "
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"types: uid={0x%" PRIx64 "}, type-name='%s'\n",
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original_ptr, in_value.GetTypeName().AsCString(),
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type_sp->GetID(), type_sp->GetName().GetCString());
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}
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}
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}
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for (i = 0; i < num_matches; i++) {
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type_sp = class_types.GetTypeAtIndex(i);
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if (type_sp) {
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if (ClangASTContext::IsCXXClassType(
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type_sp->GetForwardCompilerType())) {
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if (log)
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log->Printf(
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"0x%16.16" PRIx64 ": static-type = '%s' has multiple "
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"matching dynamic types, picking "
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"this one: uid={0x%" PRIx64
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"}, type-name='%s'\n",
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original_ptr, in_value.GetTypeName().AsCString(),
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type_sp->GetID(), type_sp->GetName().GetCString());
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type_info.SetTypeSP(type_sp);
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}
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}
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}
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if (log && i == num_matches) {
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log->Printf(
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"0x%16.16" PRIx64
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": static-type = '%s' has multiple matching dynamic "
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"types, didn't find a C++ match\n",
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original_ptr, in_value.GetTypeName().AsCString());
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}
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}
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if (type_info)
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SetDynamicTypeInfo(vtable_addr, type_info);
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return type_info;
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}
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}
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}
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}
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}
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return TypeAndOrName();
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}
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bool ItaniumABILanguageRuntime::GetDynamicTypeAndAddress(
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ValueObject &in_value, lldb::DynamicValueType use_dynamic,
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TypeAndOrName &class_type_or_name, Address &dynamic_address,
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Value::ValueType &value_type) {
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// For Itanium, if the type has a vtable pointer in the object, it will be at
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// offset 0 in the object. That will point to the "address point" within the
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// vtable (not the beginning of the vtable.) We can then look up the symbol
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// containing this "address point" and that symbol's name demangled will
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// contain the full class name. The second pointer above the "address point"
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// is the "offset_to_top". We'll use that to get the start of the value
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// object which holds the dynamic type.
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//
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class_type_or_name.Clear();
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value_type = Value::ValueType::eValueTypeScalar;
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// Only a pointer or reference type can have a different dynamic and static
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// type:
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if (CouldHaveDynamicValue(in_value)) {
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// First job, pull out the address at 0 offset from the object.
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AddressType address_type;
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lldb::addr_t original_ptr = in_value.GetPointerValue(&address_type);
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if (original_ptr == LLDB_INVALID_ADDRESS)
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return false;
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ExecutionContext exe_ctx(in_value.GetExecutionContextRef());
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Process *process = exe_ctx.GetProcessPtr();
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if (process == nullptr)
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return false;
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Status error;
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const lldb::addr_t vtable_address_point =
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process->ReadPointerFromMemory(original_ptr, error);
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if (!error.Success() || vtable_address_point == LLDB_INVALID_ADDRESS) {
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return false;
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}
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class_type_or_name = GetTypeInfoFromVTableAddress(in_value, original_ptr,
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vtable_address_point);
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if (class_type_or_name) {
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TypeSP type_sp = class_type_or_name.GetTypeSP();
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// There can only be one type with a given name, so we've just found
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// duplicate definitions, and this one will do as well as any other. We
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// don't consider something to have a dynamic type if it is the same as
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// the static type. So compare against the value we were handed.
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if (type_sp) {
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if (ClangASTContext::AreTypesSame(in_value.GetCompilerType(),
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type_sp->GetForwardCompilerType())) {
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// The dynamic type we found was the same type, so we don't have a
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// dynamic type here...
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return false;
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}
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// The offset_to_top is two pointers above the vtable pointer.
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const uint32_t addr_byte_size = process->GetAddressByteSize();
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const lldb::addr_t offset_to_top_location =
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vtable_address_point - 2 * addr_byte_size;
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// Watch for underflow, offset_to_top_location should be less than
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// vtable_address_point
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if (offset_to_top_location >= vtable_address_point)
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return false;
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const int64_t offset_to_top = process->ReadSignedIntegerFromMemory(
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offset_to_top_location, addr_byte_size, INT64_MIN, error);
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if (offset_to_top == INT64_MIN)
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return false;
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// So the dynamic type is a value that starts at offset_to_top above
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// the original address.
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lldb::addr_t dynamic_addr = original_ptr + offset_to_top;
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if (!process->GetTarget().GetSectionLoadList().ResolveLoadAddress(
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dynamic_addr, dynamic_address)) {
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dynamic_address.SetRawAddress(dynamic_addr);
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}
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return true;
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}
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}
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}
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return class_type_or_name.IsEmpty() == false;
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}
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TypeAndOrName ItaniumABILanguageRuntime::FixUpDynamicType(
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const TypeAndOrName &type_and_or_name, ValueObject &static_value) {
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CompilerType static_type(static_value.GetCompilerType());
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Flags static_type_flags(static_type.GetTypeInfo());
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TypeAndOrName ret(type_and_or_name);
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if (type_and_or_name.HasType()) {
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// The type will always be the type of the dynamic object. If our parent's
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// type was a pointer, then our type should be a pointer to the type of the
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// dynamic object. If a reference, then the original type should be
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// okay...
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CompilerType orig_type = type_and_or_name.GetCompilerType();
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CompilerType corrected_type = orig_type;
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if (static_type_flags.AllSet(eTypeIsPointer))
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corrected_type = orig_type.GetPointerType();
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else if (static_type_flags.AllSet(eTypeIsReference))
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corrected_type = orig_type.GetLValueReferenceType();
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ret.SetCompilerType(corrected_type);
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} else {
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// If we are here we need to adjust our dynamic type name to include the
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// correct & or * symbol
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std::string corrected_name(type_and_or_name.GetName().GetCString());
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if (static_type_flags.AllSet(eTypeIsPointer))
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corrected_name.append(" *");
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else if (static_type_flags.AllSet(eTypeIsReference))
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corrected_name.append(" &");
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// the parent type should be a correctly pointer'ed or referenc'ed type
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ret.SetCompilerType(static_type);
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ret.SetName(corrected_name.c_str());
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}
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return ret;
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}
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bool ItaniumABILanguageRuntime::IsVTableName(const char *name) {
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if (name == NULL)
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return false;
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// Can we maybe ask Clang about this?
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if (strstr(name, "_vptr$") == name)
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return true;
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else
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return false;
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}
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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LanguageRuntime *
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ItaniumABILanguageRuntime::CreateInstance(Process *process,
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lldb::LanguageType language) {
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// FIXME: We have to check the process and make sure we actually know that
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// this process supports
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// the Itanium ABI.
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if (language == eLanguageTypeC_plus_plus ||
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language == eLanguageTypeC_plus_plus_03 ||
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language == eLanguageTypeC_plus_plus_11 ||
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language == eLanguageTypeC_plus_plus_14)
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return new ItaniumABILanguageRuntime(process);
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else
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return NULL;
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}
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class CommandObjectMultiwordItaniumABI_Demangle : public CommandObjectParsed {
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public:
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CommandObjectMultiwordItaniumABI_Demangle(CommandInterpreter &interpreter)
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: CommandObjectParsed(interpreter, "demangle",
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"Demangle a C++ mangled name.",
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"language cplusplus demangle") {
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CommandArgumentEntry arg;
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CommandArgumentData index_arg;
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// Define the first (and only) variant of this arg.
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index_arg.arg_type = eArgTypeSymbol;
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index_arg.arg_repetition = eArgRepeatPlus;
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// There is only one variant this argument could be; put it into the
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// argument entry.
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arg.push_back(index_arg);
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// Push the data for the first argument into the m_arguments vector.
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m_arguments.push_back(arg);
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}
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~CommandObjectMultiwordItaniumABI_Demangle() override = default;
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protected:
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bool DoExecute(Args &command, CommandReturnObject &result) override {
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bool demangled_any = false;
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bool error_any = false;
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for (auto &entry : command.entries()) {
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if (entry.ref.empty())
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continue;
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// the actual Mangled class should be strict about this, but on the
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// command line if you're copying mangled names out of 'nm' on Darwin,
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// they will come out with an extra underscore - be willing to strip this
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// on behalf of the user. This is the moral equivalent of the -_/-n
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// options to c++filt
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auto name = entry.ref;
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if (name.startswith("__Z"))
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name = name.drop_front();
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Mangled mangled(name, true);
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if (mangled.GuessLanguage() == lldb::eLanguageTypeC_plus_plus) {
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ConstString demangled(
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mangled.GetDisplayDemangledName(lldb::eLanguageTypeC_plus_plus));
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demangled_any = true;
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result.AppendMessageWithFormat("%s ---> %s\n", entry.ref.str().c_str(),
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demangled.GetCString());
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} else {
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error_any = true;
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result.AppendErrorWithFormat("%s is not a valid C++ mangled name\n",
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entry.ref.str().c_str());
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}
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}
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result.SetStatus(
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error_any ? lldb::eReturnStatusFailed
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: (demangled_any ? lldb::eReturnStatusSuccessFinishResult
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: lldb::eReturnStatusSuccessFinishNoResult));
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return result.Succeeded();
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}
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};
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class CommandObjectMultiwordItaniumABI : public CommandObjectMultiword {
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public:
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CommandObjectMultiwordItaniumABI(CommandInterpreter &interpreter)
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: CommandObjectMultiword(
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interpreter, "cplusplus",
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"Commands for operating on the C++ language runtime.",
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"cplusplus <subcommand> [<subcommand-options>]") {
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LoadSubCommand(
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"demangle",
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CommandObjectSP(
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new CommandObjectMultiwordItaniumABI_Demangle(interpreter)));
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}
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~CommandObjectMultiwordItaniumABI() override = default;
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};
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void ItaniumABILanguageRuntime::Initialize() {
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PluginManager::RegisterPlugin(
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GetPluginNameStatic(), "Itanium ABI for the C++ language", CreateInstance,
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[](CommandInterpreter &interpreter) -> lldb::CommandObjectSP {
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return CommandObjectSP(
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new CommandObjectMultiwordItaniumABI(interpreter));
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});
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}
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void ItaniumABILanguageRuntime::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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lldb_private::ConstString ItaniumABILanguageRuntime::GetPluginNameStatic() {
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static ConstString g_name("itanium");
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return g_name;
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}
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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lldb_private::ConstString ItaniumABILanguageRuntime::GetPluginName() {
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return GetPluginNameStatic();
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}
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uint32_t ItaniumABILanguageRuntime::GetPluginVersion() { return 1; }
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BreakpointResolverSP ItaniumABILanguageRuntime::CreateExceptionResolver(
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Breakpoint *bkpt, bool catch_bp, bool throw_bp) {
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return CreateExceptionResolver(bkpt, catch_bp, throw_bp, false);
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}
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BreakpointResolverSP ItaniumABILanguageRuntime::CreateExceptionResolver(
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Breakpoint *bkpt, bool catch_bp, bool throw_bp, bool for_expressions) {
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// One complication here is that most users DON'T want to stop at
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// __cxa_allocate_expression, but until we can do anything better with
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// predicting unwinding the expression parser does. So we have two forms of
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// the exception breakpoints, one for expressions that leaves out
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// __cxa_allocate_exception, and one that includes it. The
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// SetExceptionBreakpoints does the latter, the CreateExceptionBreakpoint in
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// the runtime the former.
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static const char *g_catch_name = "__cxa_begin_catch";
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static const char *g_throw_name1 = "__cxa_throw";
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static const char *g_throw_name2 = "__cxa_rethrow";
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static const char *g_exception_throw_name = "__cxa_allocate_exception";
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std::vector<const char *> exception_names;
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exception_names.reserve(4);
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if (catch_bp)
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exception_names.push_back(g_catch_name);
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if (throw_bp) {
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exception_names.push_back(g_throw_name1);
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exception_names.push_back(g_throw_name2);
|
|
}
|
|
|
|
if (for_expressions)
|
|
exception_names.push_back(g_exception_throw_name);
|
|
|
|
BreakpointResolverSP resolver_sp(new BreakpointResolverName(
|
|
bkpt, exception_names.data(), exception_names.size(),
|
|
eFunctionNameTypeBase, eLanguageTypeUnknown, 0, eLazyBoolNo));
|
|
|
|
return resolver_sp;
|
|
}
|
|
|
|
lldb::SearchFilterSP ItaniumABILanguageRuntime::CreateExceptionSearchFilter() {
|
|
Target &target = m_process->GetTarget();
|
|
|
|
if (target.GetArchitecture().GetTriple().getVendor() == llvm::Triple::Apple) {
|
|
// Limit the number of modules that are searched for these breakpoints for
|
|
// Apple binaries.
|
|
FileSpecList filter_modules;
|
|
filter_modules.Append(FileSpec("libc++abi.dylib", false));
|
|
filter_modules.Append(FileSpec("libSystem.B.dylib", false));
|
|
return target.GetSearchFilterForModuleList(&filter_modules);
|
|
} else {
|
|
return LanguageRuntime::CreateExceptionSearchFilter();
|
|
}
|
|
}
|
|
|
|
lldb::BreakpointSP ItaniumABILanguageRuntime::CreateExceptionBreakpoint(
|
|
bool catch_bp, bool throw_bp, bool for_expressions, bool is_internal) {
|
|
Target &target = m_process->GetTarget();
|
|
FileSpecList filter_modules;
|
|
BreakpointResolverSP exception_resolver_sp =
|
|
CreateExceptionResolver(NULL, catch_bp, throw_bp, for_expressions);
|
|
SearchFilterSP filter_sp(CreateExceptionSearchFilter());
|
|
const bool hardware = false;
|
|
const bool resolve_indirect_functions = false;
|
|
return target.CreateBreakpoint(filter_sp, exception_resolver_sp, is_internal,
|
|
hardware, resolve_indirect_functions);
|
|
}
|
|
|
|
void ItaniumABILanguageRuntime::SetExceptionBreakpoints() {
|
|
if (!m_process)
|
|
return;
|
|
|
|
const bool catch_bp = false;
|
|
const bool throw_bp = true;
|
|
const bool is_internal = true;
|
|
const bool for_expressions = true;
|
|
|
|
// For the exception breakpoints set by the Expression parser, we'll be a
|
|
// little more aggressive and stop at exception allocation as well.
|
|
|
|
if (m_cxx_exception_bp_sp) {
|
|
m_cxx_exception_bp_sp->SetEnabled(true);
|
|
} else {
|
|
m_cxx_exception_bp_sp = CreateExceptionBreakpoint(
|
|
catch_bp, throw_bp, for_expressions, is_internal);
|
|
if (m_cxx_exception_bp_sp)
|
|
m_cxx_exception_bp_sp->SetBreakpointKind("c++ exception");
|
|
}
|
|
}
|
|
|
|
void ItaniumABILanguageRuntime::ClearExceptionBreakpoints() {
|
|
if (!m_process)
|
|
return;
|
|
|
|
if (m_cxx_exception_bp_sp) {
|
|
m_cxx_exception_bp_sp->SetEnabled(false);
|
|
}
|
|
}
|
|
|
|
bool ItaniumABILanguageRuntime::ExceptionBreakpointsAreSet() {
|
|
return m_cxx_exception_bp_sp && m_cxx_exception_bp_sp->IsEnabled();
|
|
}
|
|
|
|
bool ItaniumABILanguageRuntime::ExceptionBreakpointsExplainStop(
|
|
lldb::StopInfoSP stop_reason) {
|
|
if (!m_process)
|
|
return false;
|
|
|
|
if (!stop_reason || stop_reason->GetStopReason() != eStopReasonBreakpoint)
|
|
return false;
|
|
|
|
uint64_t break_site_id = stop_reason->GetValue();
|
|
return m_process->GetBreakpointSiteList().BreakpointSiteContainsBreakpoint(
|
|
break_site_id, m_cxx_exception_bp_sp->GetID());
|
|
}
|
|
|
|
TypeAndOrName ItaniumABILanguageRuntime::GetDynamicTypeInfo(
|
|
const lldb_private::Address &vtable_addr) {
|
|
std::lock_guard<std::mutex> locker(m_dynamic_type_map_mutex);
|
|
DynamicTypeCache::const_iterator pos = m_dynamic_type_map.find(vtable_addr);
|
|
if (pos == m_dynamic_type_map.end())
|
|
return TypeAndOrName();
|
|
else
|
|
return pos->second;
|
|
}
|
|
|
|
void ItaniumABILanguageRuntime::SetDynamicTypeInfo(
|
|
const lldb_private::Address &vtable_addr, const TypeAndOrName &type_info) {
|
|
std::lock_guard<std::mutex> locker(m_dynamic_type_map_mutex);
|
|
m_dynamic_type_map[vtable_addr] = type_info;
|
|
}
|