XRayLists.cpp revision 353358 
1//===-- XRayLists.cpp - XRay automatic-attribution ------------------------===//
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// User-provided filters for always/never XRay instrumenting certain functions.
10//
11//===----------------------------------------------------------------------===//
12#include "clang/Basic/XRayLists.h"
13
14using namespace clang;
15
16XRayFunctionFilter::XRayFunctionFilter(
17    ArrayRef<std::string> AlwaysInstrumentPaths,
18    ArrayRef<std::string> NeverInstrumentPaths,
19    ArrayRef<std::string> AttrListPaths, SourceManager &SM)
20    : AlwaysInstrument(
21          llvm::SpecialCaseList::createOrDie(AlwaysInstrumentPaths)),
22      NeverInstrument(llvm::SpecialCaseList::createOrDie(NeverInstrumentPaths)),
23      AttrList(llvm::SpecialCaseList::createOrDie(AttrListPaths)), SM(SM) {}
24
25XRayFunctionFilter::ImbueAttribute
26XRayFunctionFilter::shouldImbueFunction(StringRef FunctionName) const {
27  // First apply the always instrument list, than if it isn't an "always" see
28  // whether it's treated as a "never" instrument function.
29  // TODO: Remove these as they're deprecated; use the AttrList exclusively.
30  if (AlwaysInstrument->inSection("xray_always_instrument", "fun", FunctionName,
31                                  "arg1") ||
32      AttrList->inSection("always", "fun", FunctionName, "arg1"))
33    return ImbueAttribute::ALWAYS_ARG1;
34  if (AlwaysInstrument->inSection("xray_always_instrument", "fun",
35                                  FunctionName) ||
36      AttrList->inSection("always", "fun", FunctionName))
37    return ImbueAttribute::ALWAYS;
38
39  if (NeverInstrument->inSection("xray_never_instrument", "fun",
40                                 FunctionName) ||
41      AttrList->inSection("never", "fun", FunctionName))
42    return ImbueAttribute::NEVER;
43
44  return ImbueAttribute::NONE;
45}
46
47XRayFunctionFilter::ImbueAttribute
48XRayFunctionFilter::shouldImbueFunctionsInFile(StringRef Filename,
49                                               StringRef Category) const {
50  if (AlwaysInstrument->inSection("xray_always_instrument", "src", Filename,
51                                  Category) ||
52      AttrList->inSection("always", "src", Filename, Category))
53    return ImbueAttribute::ALWAYS;
54  if (NeverInstrument->inSection("xray_never_instrument", "src", Filename,
55                                 Category) ||
56      AttrList->inSection("never", "src", Filename, Category))
57    return ImbueAttribute::NEVER;
58  return ImbueAttribute::NONE;
59}
60
61XRayFunctionFilter::ImbueAttribute
62XRayFunctionFilter::shouldImbueLocation(SourceLocation Loc,
63                                        StringRef Category) const {
64  if (!Loc.isValid())
65    return ImbueAttribute::NONE;
66  return this->shouldImbueFunctionsInFile(SM.getFilename(SM.getFileLoc(Loc)),
67                                          Category);
68}
69