8184b252cd
This patch adds support for evaluating expressions which reference a captured `this` from within the context of a C++ lambda expression. Currently LLDB doesn't provide Clang with enough information to determine that we're inside a lambda expression and are allowed to access variables on a captured `this`; instead Clang simply fails to parse the expression. There are two problems to solve here: 1. Make sure `clang::Sema` doesn't reject the expression due to an illegal member access. 2. Materialize all the captured variables/member variables required to evaluate the expression. To address (1), we currently import the outer structure's AST context onto `$__lldb_class`, making the `contextClass` and the `NamingClass` match, a requirement by `clang::Sema::BuildPossibleImplicitMemberExpr`. To address (2), we inject all captured variables as locals into the expression source code. **Testing** * Added API test
31 lines
1.2 KiB
C++
31 lines
1.2 KiB
C++
//===-- ClangExpressionUtil.h -----------------------------------*- 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGEXPRESSIONUTIL_H
|
|
#define LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGEXPRESSIONUTIL_H
|
|
|
|
#include "lldb/lldb-private.h"
|
|
|
|
namespace lldb_private {
|
|
namespace ClangExpressionUtil {
|
|
/// Returns a ValueObject for the lambda class in the current frame
|
|
///
|
|
/// To represent a lambda, Clang generates an artificial class
|
|
/// whose members are the captures and whose operator() is the
|
|
/// lambda implementation. If we capture a 'this' pointer,
|
|
/// the artifical class will contain a member variable named 'this'.
|
|
///
|
|
/// This method returns the 'this' pointer to the artificial lambda
|
|
/// class if a real 'this' was captured. Otherwise, returns nullptr.
|
|
lldb::ValueObjectSP GetLambdaValueObject(StackFrame *frame);
|
|
|
|
} // namespace ClangExpressionUtil
|
|
} // namespace lldb_private
|
|
|
|
#endif // LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGEXPRESSIONHELPER_H
|