[Lldb-commits] [lldb] [LLDB] Add DIL code for handling plain variable names. (PR #120971)

[Pavel Labath via lldb-commits]

================
@@ -0,0 +1,244 @@
+//===-- DILEval.cpp -------------------------------------------------------===//
+//
+// 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/ValueObject/DILEval.h"
+#include "lldb/Symbol/VariableList.h"
+#include "lldb/Target/RegisterContext.h"
+#include "lldb/ValueObject/DILAST.h"
+#include "lldb/ValueObject/ValueObject.h"
+#include "lldb/ValueObject/ValueObjectRegister.h"
+#include "lldb/ValueObject/ValueObjectVariable.h"
+#include "llvm/Support/FormatAdapters.h"
+#include <memory>
+
+namespace lldb_private::dil {
+
+static lldb::ValueObjectSP
+LookupStaticIdentifier(VariableList &variable_list,
+                       std::shared_ptr<ExecutionContextScope> exe_scope,
+                       llvm::StringRef name_ref,
+                       llvm::StringRef unqualified_name) {
+  // First look for an exact match to the (possibly) qualified name.
+  for (const lldb::VariableSP &var_sp : variable_list) {
+    lldb::ValueObjectSP valobj_sp(
+        ValueObjectVariable::Create(exe_scope.get(), var_sp));
+    if (valobj_sp && valobj_sp->GetVariable() &&
+        (valobj_sp->GetVariable()->NameMatches(ConstString(name_ref))))
+      return valobj_sp;
+  }
+
+  // If the qualified name is the same as the unqualfied name, there's nothing
+  // more to be done.
+  if (name_ref == unqualified_name)
+    return nullptr;
+
+  // We didn't match the qualified name; try to match the unqualified name.
+  for (const lldb::VariableSP &var_sp : variable_list) {
+    lldb::ValueObjectSP valobj_sp(
+        ValueObjectVariable::Create(exe_scope.get(), var_sp));
+    if (valobj_sp && valobj_sp->GetVariable() &&
+        (valobj_sp->GetVariable()->NameMatches(ConstString(unqualified_name))))
+      return valobj_sp;
+  }
+
+  return nullptr;
+}
+
+static lldb::VariableSP DILFindVariable(ConstString name,
+                                        VariableList *variable_list) {
+  lldb::VariableSP exact_match;
+  std::vector<lldb::VariableSP> possible_matches;
+
+  typedef std::vector<lldb::VariableSP> collection;
+  typedef collection::iterator iterator;
+
+  iterator pos, end = variable_list->end();
+  for (pos = variable_list->begin(); pos != end; ++pos) {
+    llvm::StringRef str_ref_name = pos->get()->GetName().GetStringRef();
+    // Check for global vars, which might start with '::'.
+    str_ref_name.consume_front("::");
+
+    if (str_ref_name == name.GetStringRef())
+      possible_matches.push_back(*pos);
+    else if (pos->get()->NameMatches(name))
+      possible_matches.push_back(*pos);
+  }
+
+  // Look for exact matches (favors local vars over global vars)
+  auto exact_match_it =
+      llvm::find_if(possible_matches, [&](lldb::VariableSP var_sp) {
+        return var_sp->GetName() == name;
+      });
+
+  if (exact_match_it != llvm::adl_end(possible_matches))
+    exact_match = *exact_match_it;
+
+  if (!exact_match)
+    // Look for a global var exact match.
+    for (auto var_sp : possible_matches) {
+      llvm::StringRef str_ref_name = var_sp->GetName().GetStringRef();
+      str_ref_name.consume_front("::");
+      if (str_ref_name == name.GetStringRef()) {
+        exact_match = var_sp;
+        break;
+      }
+    }
+
+  if (!exact_match && possible_matches.size() == 1)
+    exact_match = possible_matches[0];
+
+  return exact_match;
+}
+
+std::unique_ptr<IdentifierInfo>
+LookupIdentifier(llvm::StringRef name_ref,
+                 std::shared_ptr<ExecutionContextScope> ctx_scope,
+                 lldb::TargetSP target_sp, lldb::DynamicValueType use_dynamic,
+                 CompilerType *scope_ptr) {
+  // Support $rax as a special syntax for accessing registers.
+  // Will return an invalid value in case the requested register doesn't exist.
+  if (name_ref.consume_front("$")) {
+    lldb::ValueObjectSP value_sp;
+    Process *process = ctx_scope->CalculateProcess().get();
+    if (!target_sp || !process)
+      return nullptr;
+
+    StackFrame *stack_frame = (StackFrame *)ctx_scope.get();
+    if (!stack_frame)
+      return nullptr;
+
+    lldb::RegisterContextSP reg_ctx(stack_frame->GetRegisterContext());
+    if (!reg_ctx)
+      return nullptr;
+
+    if (const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName(name_ref))
+      value_sp = ValueObjectRegister::Create(stack_frame, reg_ctx, reg_info);
+
+    if (value_sp)
+      return IdentifierInfo::FromValue(*value_sp);
+
+    return nullptr;
+  }
+
+  lldb::StackFrameSP frame = ctx_scope->CalculateStackFrame();
+  lldb::VariableListSP var_list_sp(frame->GetInScopeVariableList(true));
+  VariableList *variable_list = var_list_sp.get();
----------------
labath wrote:

you don't need the extra variable `*var_list_sp` and `var_list_sp->foo()` works just fine.

https://github.com/llvm/llvm-project/pull/120971