1//===-- DataCollection.cpp --------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "clang/AST/DataCollection.h"
10#include "clang/Basic/SourceManager.h"
11#include "clang/Lex/Lexer.h"
12
13namespace clang {
14namespace data_collection {
15
16/// Prints the macro name that contains the given SourceLocation into the given
17/// raw_string_ostream.
18static void printMacroName(llvm::raw_string_ostream &MacroStack,
19 ASTContext &Context, SourceLocation Loc) {
20 MacroStack << Lexer::getImmediateMacroName(Loc, SM: Context.getSourceManager(),
21 LangOpts: Context.getLangOpts());
22
23 // Add an empty space at the end as a padding to prevent
24 // that macro names concatenate to the names of other macros.
25 MacroStack << " ";
26}
27
28/// Returns a string that represents all macro expansions that expanded into the
29/// given SourceLocation.
30///
31/// If 'getMacroStack(A) == getMacroStack(B)' is true, then the SourceLocations
32/// A and B are expanded from the same macros in the same order.
33std::string getMacroStack(SourceLocation Loc, ASTContext &Context) {
34 std::string MacroStack;
35 llvm::raw_string_ostream MacroStackStream(MacroStack);
36 SourceManager &SM = Context.getSourceManager();
37
38 // Iterate over all macros that expanded into the given SourceLocation.
39 while (Loc.isMacroID()) {
40 // Add the macro name to the stream.
41 printMacroName(MacroStack&: MacroStackStream, Context, Loc);
42 Loc = SM.getImmediateMacroCallerLoc(Loc);
43 }
44 return MacroStack;
45}
46
47} // end namespace data_collection
48} // end namespace clang
49