574 lines
22 KiB
C++
574 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/Scalar.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/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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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
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// and 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(class_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
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// module list in the target and get as many unique matches
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// 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(class_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
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// in the object. That will point to the "address point" within the vtable
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// (not the beginning of the
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// vtable.) We can then look up the symbol containing this "address point"
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// and that symbol's name
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// demangled will contain the full class name.
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// The second pointer above the "address point" is the "offset_to_top". We'll
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// use that to get the
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// start of the value 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,
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// so we've just found duplicate definitions, and this
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// one will do as well as any other.
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// We don't consider something to have a dynamic type if
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// it is the same as the static type. So compare against
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// 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,
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// so we don't have a 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
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// above 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,
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// then our type should be a pointer to the type of the dynamic object. If
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// a reference, then the original type
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// should be 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
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// this 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
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// anything better with predicting unwinding the expression parser does. So
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// we have two forms of the exception
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// breakpoints, one for expressions that leaves out __cxa_allocate_exception,
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// and one that includes it.
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// The SetExceptionBreakpoints does the latter, the CreateExceptionBreakpoint
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// in 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);
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}
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if (for_expressions)
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exception_names.push_back(g_exception_throw_name);
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BreakpointResolverSP resolver_sp(new BreakpointResolverName(
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bkpt, exception_names.data(), exception_names.size(),
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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;
|
|
}
|