https://github.com/wzssyqa created
https://github.com/llvm/llvm-project/pull/120673
When we preprocess the bellow code with
clang -E -MD -MF
#if __has_include(<limits.h>)
// DO NOTHING
#endif
#if 0 && __has_include(<limits.h>)
#include <limits.h>
#endif
It will list limits.h in the dependencies.
The same case with #__has_include_next
>From 7b2e0d9dddfe25f539f6f2c811b2f23d5a244ce8 Mon Sep 17 00:00:00 2001
From: YunQiang Su <yunqi...@isrc.iscas.ac.cn>
Date: Fri, 20 Dec 2024 02:55:49 +0000
Subject: [PATCH] Clang/Preprocessor: Not add headers of __has_include into
DepColloctor
When we preprocess the bellow code with
clang -E -MD -MF
#if __has_include(<limits.h>)
// DO NOTHING
#endif
#if 0 && __has_include(<limits.h>)
#include <limits.h>
#endif
It will list limits.h in the dependencies.
The same case with #__has_include_next
---
clang/include/clang/Lex/PPCallbacks.h | 6 +++--
clang/lib/Frontend/DependencyFile.cpp | 12 ++++++----
clang/lib/Lex/PPCallbacks.cpp | 11 +++++----
clang/lib/Lex/PPMacroExpansion.cpp | 3 ++-
.../dependencies-on-has-include.c | 23 +++++++++++++++++++
5 files changed, 43 insertions(+), 12 deletions(-)
create mode 100644 clang/test/Preprocessor/dependencies-on-has-include.c
diff --git a/clang/include/clang/Lex/PPCallbacks.h
b/clang/include/clang/Lex/PPCallbacks.h
index 46cc564086f1c5..8e03c2b9a76dbb 100644
--- a/clang/include/clang/Lex/PPCallbacks.h
+++ b/clang/include/clang/Lex/PPCallbacks.h
@@ -370,7 +370,8 @@ class PPCallbacks {
/// read.
virtual void HasInclude(SourceLocation Loc, StringRef FileName, bool
IsAngled,
OptionalFileEntryRef File,
- SrcMgr::CharacteristicKind FileType);
+ SrcMgr::CharacteristicKind FileType,
+ bool AddToDepCollector = true);
/// Hook called when a source range is skipped.
/// \param Range The SourceRange that was skipped. The range begins at the
@@ -621,7 +622,8 @@ class PPChainedCallbacks : public PPCallbacks {
void HasInclude(SourceLocation Loc, StringRef FileName, bool IsAngled,
OptionalFileEntryRef File,
- SrcMgr::CharacteristicKind FileType) override;
+ SrcMgr::CharacteristicKind FileType,
+ bool AddToDepCollector = true) override;
void PragmaOpenCLExtension(SourceLocation NameLoc, const IdentifierInfo
*Name,
SourceLocation StateLoc, unsigned State) override
{
diff --git a/clang/lib/Frontend/DependencyFile.cpp
b/clang/lib/Frontend/DependencyFile.cpp
index 528eae2c5283ea..931e29cd352211 100644
--- a/clang/lib/Frontend/DependencyFile.cpp
+++ b/clang/lib/Frontend/DependencyFile.cpp
@@ -104,15 +104,17 @@ struct DepCollectorPPCallbacks : public PPCallbacks {
void HasInclude(SourceLocation Loc, StringRef SpelledFilename, bool IsAngled,
OptionalFileEntryRef File,
- SrcMgr::CharacteristicKind FileType) override {
+ SrcMgr::CharacteristicKind FileType,
+ bool AddToDepCollector = true) override {
if (!File)
return;
StringRef Filename =
llvm::sys::path::remove_leading_dotslash(File->getName());
- DepCollector.maybeAddDependency(Filename, /*FromModule=*/false,
- /*IsSystem=*/isSystem(FileType),
- /*IsModuleFile=*/false,
- /*IsMissing=*/false);
+ if (AddToDepCollector)
+ DepCollector.maybeAddDependency(Filename, /*FromModule=*/false,
+ /*IsSystem=*/isSystem(FileType),
+ /*IsModuleFile=*/false,
+ /*IsMissing=*/false);
}
void EndOfMainFile() override {
diff --git a/clang/lib/Lex/PPCallbacks.cpp b/clang/lib/Lex/PPCallbacks.cpp
index cf473aa4df6564..79bb64892f6de6 100644
--- a/clang/lib/Lex/PPCallbacks.cpp
+++ b/clang/lib/Lex/PPCallbacks.cpp
@@ -15,14 +15,17 @@ PPCallbacks::~PPCallbacks() = default;
void PPCallbacks::HasInclude(SourceLocation Loc, StringRef FileName,
bool IsAngled, OptionalFileEntryRef File,
- SrcMgr::CharacteristicKind FileType) {}
+ SrcMgr::CharacteristicKind FileType,
+ bool AddToDepCollector) {}
// Out of line key method.
PPChainedCallbacks::~PPChainedCallbacks() = default;
void PPChainedCallbacks::HasInclude(SourceLocation Loc, StringRef FileName,
bool IsAngled, OptionalFileEntryRef File,
- SrcMgr::CharacteristicKind FileType) {
- First->HasInclude(Loc, FileName, IsAngled, File, FileType);
- Second->HasInclude(Loc, FileName, IsAngled, File, FileType);
+ SrcMgr::CharacteristicKind FileType,
+ bool AddToDepCollector) {
+ First->HasInclude(Loc, FileName, IsAngled, File, FileType,
AddToDepCollector);
+ Second->HasInclude(Loc, FileName, IsAngled, File, FileType,
+ AddToDepCollector);
}
diff --git a/clang/lib/Lex/PPMacroExpansion.cpp
b/clang/lib/Lex/PPMacroExpansion.cpp
index 347c13da0ad215..3429f08f45a2a5 100644
--- a/clang/lib/Lex/PPMacroExpansion.cpp
+++ b/clang/lib/Lex/PPMacroExpansion.cpp
@@ -1256,7 +1256,8 @@ static bool EvaluateHasIncludeCommon(Token &Tok,
IdentifierInfo *II,
SrcMgr::CharacteristicKind FileType = SrcMgr::C_User;
if (File)
FileType = PP.getHeaderSearchInfo().getFileDirFlavor(*File);
- Callbacks->HasInclude(FilenameLoc, Filename, isAngled, File, FileType);
+ Callbacks->HasInclude(FilenameLoc, Filename, isAngled, File, FileType,
+ false);
}
// Get the result value. A result of true means the file exists.
diff --git a/clang/test/Preprocessor/dependencies-on-has-include.c
b/clang/test/Preprocessor/dependencies-on-has-include.c
new file mode 100644
index 00000000000000..b6efbb22e18477
--- /dev/null
+++ b/clang/test/Preprocessor/dependencies-on-has-include.c
@@ -0,0 +1,23 @@
+// Test -MF and -E flags with has_include
+
+#ifdef TEST_HAS_INCLUDE_NEXT
+#if __has_include_next(<limits.h>)
+// DO NOTHING
+#endif
+#endif
+
+#ifdef TEST_HAS_INCLUDE
+#if __has_include(<limits.h>)
+// DO NOTHING
+#endif
+#endif
+
+// RUN: %clang -DTEST_HAS_INCLUDE -E -MD -MF - %s \
+// RUN: | FileCheck -check-prefix=TEST-HAS %s
+// TEST-HAS: dependencies-on-has-include.o:
+// TEST-HAS-NOT: limits.h
+
+// RUN: %clang -Wno-include-next-outside-header -DTEST_HAS_INCLUDE_NEXT -E -MD
-MF - %s \
+// RUN: | FileCheck -check-prefix=TEST-HAS-N %s
+// TEST-HAS-N: dependencies-on-has-include.o:
+// TEST-HAS-N-NOT: limits.h
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