1 files changed, 228 insertions, 0 deletions
diff --git a/gnu/llvm/lldb/source/Core/ValueObjectMemory.cpp b/gnu/llvm/lldb/source/Core/ValueObjectMemory.cpp
new file mode 100644
index 00000000000..1a316bf3e7b
--- /dev/null
+++ b/gnu/llvm/lldb/source/Core/ValueObjectMemory.cpp
@@ -0,0 +1,228 @@
+//===-- ValueObjectMemory.cpp ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Core/ValueObjectMemory.h"
+#include "lldb/Core/Value.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Symbol/Type.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/DataExtractor.h"
+#include "lldb/Utility/Scalar.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/lldb-types.h"
+#include "llvm/Support/ErrorHandling.h"
+
+#include <assert.h>
+#include <memory>
+
+namespace lldb_private {
+class ExecutionContextScope;
+}
+
+using namespace lldb;
+using namespace lldb_private;
+
+ValueObjectSP ValueObjectMemory::Create(ExecutionContextScope *exe_scope,
+                                        llvm::StringRef name,
+                                        const Address &address,
+                                        lldb::TypeSP &type_sp) {
+  return (new ValueObjectMemory(exe_scope, name, address, type_sp))->GetSP();
+}
+
+ValueObjectSP ValueObjectMemory::Create(ExecutionContextScope *exe_scope,
+                                        llvm::StringRef name,
+                                        const Address &address,
+                                        const CompilerType &ast_type) {
+  return (new ValueObjectMemory(exe_scope, name, address, ast_type))->GetSP();
+}
+
+ValueObjectMemory::ValueObjectMemory(ExecutionContextScope *exe_scope,
+                                     llvm::StringRef name,
+                                     const Address &address,
+                                     lldb::TypeSP &type_sp)
+    : ValueObject(exe_scope), m_address(address), m_type_sp(type_sp),
+      m_compiler_type() {
+  // Do not attempt to construct one of these objects with no variable!
+  assert(m_type_sp.get() != nullptr);
+  SetName(ConstString(name));
+  m_value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
+  TargetSP target_sp(GetTargetSP());
+  lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
+  if (load_address != LLDB_INVALID_ADDRESS) {
+    m_value.SetValueType(Value::eValueTypeLoadAddress);
+    m_value.GetScalar() = load_address;
+  } else {
+    lldb::addr_t file_address = m_address.GetFileAddress();
+    if (file_address != LLDB_INVALID_ADDRESS) {
+      m_value.SetValueType(Value::eValueTypeFileAddress);
+      m_value.GetScalar() = file_address;
+    } else {
+      m_value.GetScalar() = m_address.GetOffset();
+      m_value.SetValueType(Value::eValueTypeScalar);
+    }
+  }
+}
+
+ValueObjectMemory::ValueObjectMemory(ExecutionContextScope *exe_scope,
+                                     llvm::StringRef name,
+                                     const Address &address,
+                                     const CompilerType &ast_type)
+    : ValueObject(exe_scope), m_address(address), m_type_sp(),
+      m_compiler_type(ast_type) {
+  // Do not attempt to construct one of these objects with no variable!
+  assert(m_compiler_type.GetTypeSystem());
+  assert(m_compiler_type.GetOpaqueQualType());
+
+  TargetSP target_sp(GetTargetSP());
+
+  SetName(ConstString(name));
+  //    m_value.SetContext(Value::eContextTypeClangType,
+  //    m_compiler_type.GetOpaqueQualType());
+  m_value.SetCompilerType(m_compiler_type);
+  lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
+  if (load_address != LLDB_INVALID_ADDRESS) {
+    m_value.SetValueType(Value::eValueTypeLoadAddress);
+    m_value.GetScalar() = load_address;
+  } else {
+    lldb::addr_t file_address = m_address.GetFileAddress();
+    if (file_address != LLDB_INVALID_ADDRESS) {
+      m_value.SetValueType(Value::eValueTypeFileAddress);
+      m_value.GetScalar() = file_address;
+    } else {
+      m_value.GetScalar() = m_address.GetOffset();
+      m_value.SetValueType(Value::eValueTypeScalar);
+    }
+  }
+}
+
+ValueObjectMemory::~ValueObjectMemory() {}
+
+CompilerType ValueObjectMemory::GetCompilerTypeImpl() {
+  if (m_type_sp)
+    return m_type_sp->GetForwardCompilerType();
+  return m_compiler_type;
+}
+
+ConstString ValueObjectMemory::GetTypeName() {
+  if (m_type_sp)
+    return m_type_sp->GetName();
+  return m_compiler_type.GetConstTypeName();
+}
+
+ConstString ValueObjectMemory::GetDisplayTypeName() {
+  if (m_type_sp)
+    return m_type_sp->GetForwardCompilerType().GetDisplayTypeName();
+  return m_compiler_type.GetDisplayTypeName();
+}
+
+size_t ValueObjectMemory::CalculateNumChildren(uint32_t max) {
+  if (m_type_sp) {
+    auto child_count = m_type_sp->GetNumChildren(true);
+    return child_count <= max ? child_count : max;
+  }
+
+  ExecutionContext exe_ctx(GetExecutionContextRef());
+  const bool omit_empty_base_classes = true;
+  auto child_count =
+      m_compiler_type.GetNumChildren(omit_empty_base_classes, &exe_ctx);
+  return child_count <= max ? child_count : max;
+}
+
+uint64_t ValueObjectMemory::GetByteSize() {
+  if (m_type_sp)
+    return m_type_sp->GetByteSize().getValueOr(0);
+  return m_compiler_type.GetByteSize(nullptr).getValueOr(0);
+}
+
+lldb::ValueType ValueObjectMemory::GetValueType() const {
+  // RETHINK: Should this be inherited from somewhere?
+  return lldb::eValueTypeVariableGlobal;
+}
+
+bool ValueObjectMemory::UpdateValue() {
+  SetValueIsValid(false);
+  m_error.Clear();
+
+  ExecutionContext exe_ctx(GetExecutionContextRef());
+
+  Target *target = exe_ctx.GetTargetPtr();
+  if (target) {
+    m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
+    m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
+  }
+
+  Value old_value(m_value);
+  if (m_address.IsValid()) {
+    Value::ValueType value_type = m_value.GetValueType();
+
+    switch (value_type) {
+    default:
+      llvm_unreachable("Unhandled expression result value kind...");
+
+    case Value::eValueTypeScalar:
+      // The variable value is in the Scalar value inside the m_value. We can
+      // point our m_data right to it.
+      m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
+      break;
+
+    case Value::eValueTypeFileAddress:
+    case Value::eValueTypeLoadAddress:
+    case Value::eValueTypeHostAddress:
+      // The DWARF expression result was an address in the inferior process. If
+      // this variable is an aggregate type, we just need the address as the
+      // main value as all child variable objects will rely upon this location
+      // and add an offset and then read their own values as needed. If this
+      // variable is a simple type, we read all data for it into m_data. Make
+      // sure this type has a value before we try and read it
+
+      // If we have a file address, convert it to a load address if we can.
+      if (value_type == Value::eValueTypeFileAddress &&
+          exe_ctx.GetProcessPtr()) {
+        lldb::addr_t load_addr = m_address.GetLoadAddress(target);
+        if (load_addr != LLDB_INVALID_ADDRESS) {
+          m_value.SetValueType(Value::eValueTypeLoadAddress);
+          m_value.GetScalar() = load_addr;
+        }
+      }
+
+      if (!CanProvideValue()) {
+        // this value object represents an aggregate type whose children have
+        // values, but this object does not. So we say we are changed if our
+        // location has changed.
+        SetValueDidChange(value_type != old_value.GetValueType() ||
+                          m_value.GetScalar() != old_value.GetScalar());
+      } else {
+        // Copy the Value and set the context to use our Variable so it can
+        // extract read its value into m_data appropriately
+        Value value(m_value);
+        if (m_type_sp)
+          value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
+        else {
+          // value.SetContext(Value::eContextTypeClangType,
+          // m_compiler_type.GetOpaqueQualType());
+          value.SetCompilerType(m_compiler_type);
+        }
+
+        m_error = value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
+      }
+      break;
+    }
+
+    SetValueIsValid(m_error.Success());
+  }
+  return m_error.Success();
+}
+
+bool ValueObjectMemory::IsInScope() {
+  // FIXME: Maybe try to read the memory address, and if that works, then
+  // we are in scope?
+  return true;
+}
+
+lldb::ModuleSP ValueObjectMemory::GetModule() { return m_address.GetModule(); }