================
@@ -0,0 +1,258 @@
+//===-- DILParser.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
+//
+// This implements the recursive descent parser for the Data Inspection
+// Language (DIL), and its helper functions, which will eventually underlie the
+// 'frame variable' command. The language that this parser recognizes is
+// described in lldb/docs/dil-expr-lang.ebnf
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/ValueObject/DILParser.h"
+#include "lldb/Target/ExecutionContextScope.h"
+#include "lldb/Utility/DiagnosticsRendering.h"
+#include "lldb/ValueObject/DILAST.h"
+#include "lldb/ValueObject/DILEval.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/FormatAdapters.h"
+#include <cstdlib>
+#include <limits.h>
+#include <memory>
+#include <sstream>
+#include <string>
+
+namespace lldb_private::dil {
+
+DILDiagnosticError::DILDiagnosticError(llvm::StringRef expr,
+ const std::string &message, uint32_t
loc,
+ uint16_t err_len)
+ : ErrorInfo(make_error_code(std::errc::invalid_argument)) {
+ DiagnosticDetail::SourceLocation sloc = {
+ FileSpec{}, /*line=*/1, static_cast<uint16_t>(loc + 1),
+ err_len, false, /*in_user_input=*/true};
+ std::string rendered_msg =
+ llvm::formatv("<user expression 0>:1:{0}: {1}\n 1 | {2}\n | ^",
+ loc + 1, message, expr);
+ DiagnosticDetail detail;
+ detail.source_location = sloc;
+ detail.severity = lldb::eSeverityError;
+ detail.message = message;
+ detail.rendered = rendered_msg;
+ m_detail = std::move(detail);
+}
+
+llvm::Expected<ASTNodeUP>
+DILParser::Parse(llvm::StringRef dil_input_expr, DILLexer lexer,
+ std::shared_ptr<StackFrame> frame_sp,
+ lldb::DynamicValueType use_dynamic, bool use_synthetic,
+ bool fragile_ivar, bool check_ptr_vs_member) {
+ llvm::Error error = llvm::Error::success();
+ DILParser parser(dil_input_expr, lexer, frame_sp, use_dynamic, use_synthetic,
+ fragile_ivar, check_ptr_vs_member, error);
+
+ ASTNodeUP node_up = parser.Run();
+
+ if (error)
+ return error;
+
+ return node_up;
+}
+
+DILParser::DILParser(llvm::StringRef dil_input_expr, DILLexer lexer,
+ std::shared_ptr<StackFrame> frame_sp,
+ lldb::DynamicValueType use_dynamic, bool use_synthetic,
+ bool fragile_ivar, bool check_ptr_vs_member,
+ llvm::Error &error)
+ : m_ctx_scope(frame_sp), m_input_expr(dil_input_expr),
+ m_dil_lexer(std::move(lexer)), m_error(error),
m_use_dynamic(use_dynamic),
+ m_use_synthetic(use_synthetic), m_fragile_ivar(fragile_ivar),
+ m_check_ptr_vs_member(check_ptr_vs_member) {}
+
+ASTNodeUP DILParser::Run() {
+ ASTNodeUP expr = ParseExpression();
+
+ Expect(Token::Kind::eof);
+
+ return expr;
+}
+
+// Parse an expression.
+//
+// expression:
+// primary_expression
+//
+ASTNodeUP DILParser::ParseExpression() { return ParsePrimaryExpression(); }
+
+// Parse a primary_expression.
+//
+// primary_expression:
+// id_expression
+// "(" expression ")"
+//
+ASTNodeUP DILParser::ParsePrimaryExpression() {
+ if (CurToken().IsOneOf({Token::coloncolon, Token::identifier})) {
+ // Save the source location for the diagnostics message.
+ uint32_t loc = CurToken().GetLocation();
+ auto identifier = ParseIdExpression();
+
+ return std::make_unique<IdentifierNode>(loc, identifier);
+ }
+
+ if (CurToken().Is(Token::l_paren)) {
+ m_dil_lexer.Advance();
+ auto expr = ParseExpression();
+ Expect(Token::r_paren);
+ m_dil_lexer.Advance();
+ return expr;
+ }
+
+ BailOut(llvm::formatv("Unexpected token: {0}", CurToken()),
+ CurToken().GetLocation(), CurToken().GetSpelling().length());
+ return std::make_unique<ErrorNode>();
+}
+
+// Parse nested_name_specifier.
+//
+// nested_name_specifier:
+// type_name "::"
+// namespace_name "::"
+// nested_name_specifier identifier "::"
+//
+std::string DILParser::ParseNestedNameSpecifier() {
+ // The first token in nested_name_specifier is always an identifier, or
+ // '(anonymous namespace)'.
+ if (CurToken().IsNot(Token::identifier) && CurToken().IsNot(Token::l_paren))
+ return "";
----------------
labath wrote:
Consider pattern like:
```
switch(CurToken().GetKind())
case Token::identifier:
...
return something;
case Token::l_paren:
...
default:
return "";
}
```
(the motivation is to remove duplicate checks for token type)
https://github.com/llvm/llvm-project/pull/120971
_______________________________________________
lldb-commits mailing list
lldb-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
