如何在LibTooling中从Expr中获取ASTContext？

#include "clang/AST/ASTContext.h"
#include "clang/AST/Expr.h"

void MyASTConsumer::HandleExpr(Expr *expr) {
    ASTContext &context = expr->getASTContext();
    // 进一步处理ASTContext
}

const SourceManager &sourceManager = context.getSourceManager();
const FileEntry *fileEntry = sourceManager.getFileEntryForID(sourceManager.getMainFileID());
std::string filePath = fileEntry->getName();

SourceLocation loc = expr->getLocStart();
unsigned line = sourceManager.getSpellingLineNumber(loc);
unsigned column = sourceManager.getSpellingColumnNumber(loc);

SourceRange range = expr->getSourceRange();
std::string sourceCode = Lexer::getSourceText(CharSourceRange::getTokenRange(range), sourceManager, context.getLangOpts());

QualType type = expr->getType();
std::string typeName = type.getAsString();

for (Stmt *child : expr->children()) {
    if (Expr *subExpr = dyn_cast<Expr>(child)) {
        // 处理子表达式
    }
}