[clang-tools-extra] [clang-tidy] Add modernize-use-std-format check (PR #90397)
via cfe-commits
cfe-commits at lists.llvm.org
Sun Apr 28 07:31:55 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-tools-extra
Author: Mike Crowe (mikecrowe)
<details>
<summary>Changes</summary>
Add a new clang-tidy check that converts absl::StrFormat (and similar functions) to std::format (and similar functions.)
Split the configuration of FormatStringConverter out to a separate Configuration class so that we don't risk confusion by passing two boolean configuration parameters into the constructor. Add AllowTrailingNewlineRemoval option since we never want to remove trailing newlines in this check.
---
Patch is 28.81 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/90397.diff
13 Files Affected:
- (modified) clang-tools-extra/clang-tidy/modernize/CMakeLists.txt (+1)
- (modified) clang-tools-extra/clang-tidy/modernize/ModernizeTidyModule.cpp (+2)
- (added) clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.cpp (+108)
- (added) clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.h (+50)
- (modified) clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.cpp (+4-1)
- (modified) clang-tools-extra/clang-tidy/utils/FormatStringConverter.cpp (+6-4)
- (modified) clang-tools-extra/clang-tidy/utils/FormatStringConverter.h (+8-1)
- (modified) clang-tools-extra/docs/ReleaseNotes.rst (+9)
- (modified) clang-tools-extra/docs/clang-tidy/checks/list.rst (+1)
- (added) clang-tools-extra/docs/clang-tidy/checks/modernize/use-std-format.rst (+84)
- (added) clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-format-custom.cpp (+76)
- (added) clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-format-fmt.cpp (+37)
- (added) clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-format.cpp (+97)
``````````diff
diff --git a/clang-tools-extra/clang-tidy/modernize/CMakeLists.txt b/clang-tools-extra/clang-tidy/modernize/CMakeLists.txt
index 8005d6e91c060c..576805c4c7f181 100644
--- a/clang-tools-extra/clang-tidy/modernize/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/modernize/CMakeLists.txt
@@ -41,6 +41,7 @@ add_clang_library(clangTidyModernizeModule
UseNullptrCheck.cpp
UseOverrideCheck.cpp
UseStartsEndsWithCheck.cpp
+ UseStdFormatCheck.cpp
UseStdNumbersCheck.cpp
UseStdPrintCheck.cpp
UseTrailingReturnTypeCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/modernize/ModernizeTidyModule.cpp b/clang-tools-extra/clang-tidy/modernize/ModernizeTidyModule.cpp
index 776558433c5baa..b9c7a2dc383e88 100644
--- a/clang-tools-extra/clang-tidy/modernize/ModernizeTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/ModernizeTidyModule.cpp
@@ -42,6 +42,7 @@
#include "UseNullptrCheck.h"
#include "UseOverrideCheck.h"
#include "UseStartsEndsWithCheck.h"
+#include "UseStdFormatCheck.h"
#include "UseStdNumbersCheck.h"
#include "UseStdPrintCheck.h"
#include "UseTrailingReturnTypeCheck.h"
@@ -76,6 +77,7 @@ class ModernizeModule : public ClangTidyModule {
"modernize-use-designated-initializers");
CheckFactories.registerCheck<UseStartsEndsWithCheck>(
"modernize-use-starts-ends-with");
+ CheckFactories.registerCheck<UseStdFormatCheck>("modernize-use-std-format");
CheckFactories.registerCheck<UseStdNumbersCheck>(
"modernize-use-std-numbers");
CheckFactories.registerCheck<UseStdPrintCheck>("modernize-use-std-print");
diff --git a/clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.cpp
new file mode 100644
index 00000000000000..d22ebe857cf415
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.cpp
@@ -0,0 +1,108 @@
+//===--- UseStdFormatCheck.cpp - clang-tidy -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "UseStdFormatCheck.h"
+#include "../utils/FormatStringConverter.h"
+#include "../utils/Matchers.h"
+#include "../utils/OptionsUtils.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Tooling/FixIt.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::modernize {
+
+namespace {
+AST_MATCHER(StringLiteral, isOrdinary) { return Node.isOrdinary(); }
+} // namespace
+
+UseStdFormatCheck::UseStdFormatCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context),
+ StrictMode(Options.getLocalOrGlobal("StrictMode", false)),
+ StrFormatLikeFunctions(utils::options::parseStringList(
+ Options.get("StrFormatLikeFunctions", ""))),
+ ReplacementFormatFunction(
+ Options.get("ReplacementFormatFunction", "std::format")),
+ IncludeInserter(Options.getLocalOrGlobal("IncludeStyle",
+ utils::IncludeSorter::IS_LLVM),
+ areDiagsSelfContained()),
+ MaybeHeaderToInclude(Options.get("FormatHeader")) {
+ if (StrFormatLikeFunctions.empty())
+ StrFormatLikeFunctions.push_back("absl::StrFormat");
+
+ if (!MaybeHeaderToInclude && ReplacementFormatFunction == "std::format")
+ MaybeHeaderToInclude = "<format>";
+}
+
+void UseStdFormatCheck::registerPPCallbacks(const SourceManager &SM,
+ Preprocessor *PP,
+ Preprocessor *ModuleExpanderPP) {
+ IncludeInserter.registerPreprocessor(PP);
+}
+
+void UseStdFormatCheck::registerMatchers(MatchFinder *Finder) {
+ Finder->addMatcher(
+ callExpr(argumentCountAtLeast(1),
+ hasArgument(0, stringLiteral(isOrdinary())),
+ callee(functionDecl(unless(cxxMethodDecl()),
+ matchers::matchesAnyListedName(
+ StrFormatLikeFunctions))
+ .bind("func_decl")))
+ .bind("strformat"),
+ this);
+}
+
+void UseStdFormatCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+ using utils::options::serializeStringList;
+ Options.store(Opts, "StrictMode", StrictMode);
+ Options.store(Opts, "StrFormatLikeFunctions",
+ serializeStringList(StrFormatLikeFunctions));
+ Options.store(Opts, "ReplacementFormatFunction", ReplacementFormatFunction);
+ Options.store(Opts, "IncludeStyle", IncludeInserter.getStyle());
+ if (MaybeHeaderToInclude)
+ Options.store(Opts, "FormatHeader", *MaybeHeaderToInclude);
+}
+
+void UseStdFormatCheck::check(const MatchFinder::MatchResult &Result) {
+ const unsigned FormatArgOffset = 0;
+ const auto *OldFunction = Result.Nodes.getNodeAs<FunctionDecl>("func_decl");
+ const auto *StrFormat = Result.Nodes.getNodeAs<CallExpr>("strformat");
+
+ utils::FormatStringConverter::Configuration ConverterConfig;
+ ConverterConfig.StrictMode = StrictMode;
+ utils::FormatStringConverter Converter(Result.Context, StrFormat,
+ FormatArgOffset, ConverterConfig,
+ getLangOpts());
+ const Expr *StrFormatCall = StrFormat->getCallee();
+ if (!Converter.canApply()) {
+ DiagnosticBuilder Diag = diag(StrFormat->getBeginLoc(),
+ "unable to use '%0' instead of %1 because %2")
+ << ReplacementFormatFunction
+ << OldFunction->getIdentifier()
+ << Converter.conversionNotPossibleReason();
+ return;
+ }
+
+ DiagnosticBuilder Diag =
+ diag(StrFormatCall->getBeginLoc(), "use '%0' instead of %1")
+ << ReplacementFormatFunction << OldFunction->getIdentifier();
+ Diag << FixItHint::CreateReplacement(
+ CharSourceRange::getTokenRange(StrFormatCall->getBeginLoc(),
+ StrFormatCall->getEndLoc()),
+ ReplacementFormatFunction);
+ Converter.applyFixes(Diag, *Result.SourceManager);
+
+ if (MaybeHeaderToInclude)
+ Diag << IncludeInserter.createIncludeInsertion(
+ Result.Context->getSourceManager().getFileID(
+ StrFormatCall->getBeginLoc()),
+ *MaybeHeaderToInclude);
+}
+
+} // namespace clang::tidy::modernize
diff --git a/clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.h b/clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.h
new file mode 100644
index 00000000000000..d2aeb1bd2802c2
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/modernize/UseStdFormatCheck.h
@@ -0,0 +1,50 @@
+//===--- UseStdFormatCheck.h - clang-tidy -----------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USESTDFORMATCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USESTDFORMATCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+#include "../ClangTidyCheck.h"
+#include "../utils/IncludeInserter.h"
+
+namespace clang::tidy::modernize {
+
+/// Convert calls to absl::StrFormat-like functions to std::format.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/modernize/use-std-format.html
+class UseStdFormatCheck : public ClangTidyCheck {
+public:
+ UseStdFormatCheck(StringRef Name, ClangTidyContext *Context);
+ bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
+ if (ReplacementFormatFunction == "std::format")
+ return LangOpts.CPlusPlus20;
+ return LangOpts.CPlusPlus;
+ }
+ void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
+ Preprocessor *ModuleExpanderPP) override;
+ void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+ std::optional<TraversalKind> getCheckTraversalKind() const override {
+ return TK_IgnoreUnlessSpelledInSource;
+ }
+
+private:
+ bool StrictMode;
+ std::vector<StringRef> StrFormatLikeFunctions;
+ StringRef ReplacementFormatFunction;
+ utils::IncludeInserter IncludeInserter;
+ std::optional<StringRef> MaybeHeaderToInclude;
+};
+
+} // namespace clang::tidy::modernize
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USESTDFORMATCHECK_H
diff --git a/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.cpp
index 660996aba7b70d..a4d5fdb852d559 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.cpp
@@ -129,8 +129,11 @@ void UseStdPrintCheck::check(const MatchFinder::MatchResult &Result) {
FormatArgOffset = 1;
}
+ utils::FormatStringConverter::Configuration ConverterConfig;
+ ConverterConfig.StrictMode = StrictMode;
+ ConverterConfig.AllowTrailingNewlineRemoval = true;
utils::FormatStringConverter Converter(
- Result.Context, Printf, FormatArgOffset, StrictMode, getLangOpts());
+ Result.Context, Printf, FormatArgOffset, ConverterConfig, getLangOpts());
const Expr *PrintfCall = Printf->getCallee();
const StringRef ReplacementFunction = Converter.usePrintNewlineFunction()
? ReplacementPrintlnFunction
diff --git a/clang-tools-extra/clang-tidy/utils/FormatStringConverter.cpp b/clang-tools-extra/clang-tidy/utils/FormatStringConverter.cpp
index ad10f745b6acfb..301300eafb5581 100644
--- a/clang-tools-extra/clang-tidy/utils/FormatStringConverter.cpp
+++ b/clang-tools-extra/clang-tidy/utils/FormatStringConverter.cpp
@@ -198,10 +198,11 @@ static bool castMismatchedIntegerTypes(const CallExpr *Call, bool StrictMode) {
FormatStringConverter::FormatStringConverter(ASTContext *ContextIn,
const CallExpr *Call,
unsigned FormatArgOffset,
- bool StrictMode,
+ const Configuration ConfigIn,
const LangOptions &LO)
- : Context(ContextIn),
- CastMismatchedIntegerTypes(castMismatchedIntegerTypes(Call, StrictMode)),
+ : Context(ContextIn), Config(ConfigIn),
+ CastMismatchedIntegerTypes(
+ castMismatchedIntegerTypes(Call, ConfigIn.StrictMode)),
Args(Call->getArgs()), NumArgs(Call->getNumArgs()),
ArgsOffset(FormatArgOffset + 1), LangOpts(LO) {
assert(ArgsOffset <= NumArgs);
@@ -627,7 +628,8 @@ void FormatStringConverter::finalizeFormatText() {
// It's clearer to convert printf("Hello\r\n"); to std::print("Hello\r\n")
// than to std::println("Hello\r");
- if (StringRef(StandardFormatString).ends_with("\\n") &&
+ if (Config.AllowTrailingNewlineRemoval &&
+ StringRef(StandardFormatString).ends_with("\\n") &&
!StringRef(StandardFormatString).ends_with("\\\\n") &&
!StringRef(StandardFormatString).ends_with("\\r\\n")) {
UsePrintNewlineFunction = true;
diff --git a/clang-tools-extra/clang-tidy/utils/FormatStringConverter.h b/clang-tools-extra/clang-tidy/utils/FormatStringConverter.h
index 1949870f62ed68..1109a0b602262f 100644
--- a/clang-tools-extra/clang-tidy/utils/FormatStringConverter.h
+++ b/clang-tools-extra/clang-tidy/utils/FormatStringConverter.h
@@ -32,8 +32,14 @@ class FormatStringConverter
public:
using ConversionSpecifier = clang::analyze_format_string::ConversionSpecifier;
using PrintfSpecifier = analyze_printf::PrintfSpecifier;
+
+ struct Configuration {
+ bool StrictMode = false;
+ bool AllowTrailingNewlineRemoval = false;
+ };
+
FormatStringConverter(ASTContext *Context, const CallExpr *Call,
- unsigned FormatArgOffset, bool StrictMode,
+ unsigned FormatArgOffset, Configuration Config,
const LangOptions &LO);
bool canApply() const { return ConversionNotPossibleReason.empty(); }
@@ -45,6 +51,7 @@ class FormatStringConverter
private:
ASTContext *Context;
+ const Configuration Config;
const bool CastMismatchedIntegerTypes;
const Expr *const *Args;
const unsigned NumArgs;
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 3038d2b125f20d..c166801dfd6a60 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -145,6 +145,15 @@ New checks
Finds initializer lists for aggregate types that could be
written as designated initializers instead.
+- New :doc:`modernize-use-std-format
+ <clang-tidy/checks/modernize/use-std-format>` check.
+
+ Converts calls to ``absl::StrFormat``, or other functions via
+ configuration options, to C++20's ``std::format``, or another function
+ via a configuration option, modifying the format string appropriately and
+ removing now-unnecessary calls to ``std::string::c_str()`` and
+ ``std::string::data()``.
+
- New :doc:`readability-enum-initial-value
<clang-tidy/checks/readability/enum-initial-value>` check.
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index 49747ff896ba5c..50cba5b1d21153 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -300,6 +300,7 @@ Clang-Tidy Checks
:doc:`modernize-use-nullptr <modernize/use-nullptr>`, "Yes"
:doc:`modernize-use-override <modernize/use-override>`, "Yes"
:doc:`modernize-use-starts-ends-with <modernize/use-starts-ends-with>`, "Yes"
+ :doc:`modernize-use-std-format <modernize/use-std-format>`, "Yes"
:doc:`modernize-use-std-numbers <modernize/use-std-numbers>`, "Yes"
:doc:`modernize-use-std-print <modernize/use-std-print>`, "Yes"
:doc:`modernize-use-trailing-return-type <modernize/use-trailing-return-type>`, "Yes"
diff --git a/clang-tools-extra/docs/clang-tidy/checks/modernize/use-std-format.rst b/clang-tools-extra/docs/clang-tidy/checks/modernize/use-std-format.rst
new file mode 100644
index 00000000000000..60dc8ea5e3c46e
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/modernize/use-std-format.rst
@@ -0,0 +1,84 @@
+.. title:: clang-tidy - modernize-use-std-format
+
+modernize-use-std-format
+========================
+
+Converts calls to ``absl::StrFormat``, or other functions via
+configuration options, to C++20's ``std::format``, or another function
+via a configuration option, modifying the format string appropriately and
+removing now-unnecessary calls to ``std::string::c_str()`` and
+``std::string::data()``.
+
+In other words, it turns lines like:
+
+.. code-block:: c++
+
+ return absl::StrFormat("The %s is %3d\n", description.c_str(), value);
+
+into:
+
+.. code-block:: c++
+
+ return std::format("The {} is {:3}", description, value);
+
+The check uses the same format-string-conversion algorithm as
+`modernize-use-std-print <../modernize/use-std-print.html>`_ and its
+shortcomings are described in the documentation for that check.
+
+Options
+-------
+
+.. option:: StrictMode
+
+ When `true`, the check will add casts when converting from variadic
+ functions and printing signed or unsigned integer types (including
+ fixed-width integer types from ``<cstdint>``, ``ptrdiff_t``, ``size_t``
+ and ``ssize_t``) as the opposite signedness to ensure that the output
+ would matches that of a simple wrapper for ``std::sprintf`` that
+ accepted a C-style variable argument list. For example, with
+ `StrictMode` enabled:
+
+ .. code-block:: c++
+
+ extern std::string strprintf(const char *format, ...);
+ int i = -42;
+ unsigned int u = 0xffffffff;
+ return strprintf("%d %u\n", i, u);
+
+ would be converted to:
+
+ .. code-block:: c++
+
+ return std::format("{} {}\n", static_cast<unsigned int>(i), static_cast<int>(u));
+
+ to ensure that the output will continue to be the unsigned representation
+ of -42 and the signed representation of 0xffffffff (often 4294967254
+ and -1 respectively.) When `false` (which is the default), these casts
+ will not be added which may cause a change in the output. Note that this
+ option makes no difference for the default value of
+ `StrFormatLikeFunctions` since ``absl::StrFormat`` takes a function
+ parameter pack and is not a variadic function.
+
+.. option:: StrFormatLikeFunctions
+
+ A semicolon-separated list of (fully qualified) extra function names to
+ replace, with the requirement that the first parameter contains the
+ printf-style format string and the arguments to be formatted follow
+ immediately afterwards. The default value for this option is
+ `absl::StrFormat`.
+
+.. option:: ReplacementFormatFunction
+
+ The function that will be used to replace the function set by the
+ `StrFormatLikeFunctions` option rather than the default
+ `std::format`. It is expected that the function provides an interface
+ that is compatible with ``std::format``. A suitable candidate would be
+ `fmt::format`.
+
+.. option:: FormatHeader
+
+ The header that must be included for the declaration of
+ `ReplacementFormatFunction` so that a ``#include`` directive can be added if
+ required. If `ReplacementFormatFunction` is `std::format` then this option will
+ default to ``<format>``, otherwise this option will default to nothing
+ and no ``#include`` directive will be added.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-format-custom.cpp b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-format-custom.cpp
new file mode 100644
index 00000000000000..bcec9da5cf03a9
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-format-custom.cpp
@@ -0,0 +1,76 @@
+// RUN: %check_clang_tidy -check-suffixes=,STRICT \
+// RUN: -std=c++20 %s modernize-use-std-format %t -- \
+// RUN: -config="{CheckOptions: \
+// RUN: [ \
+// RUN: { \
+// RUN: key: StrictMode, value: true \
+// RUN: }, \
+// RUN: { \
+// RUN: key: modernize-use-std-format.StrFormatLikeFunctions, \
+// RUN: value: 'unqualified_strprintf;::strprintf; mynamespace::strprintf2' \
+// RUN: }, \
+// RUN: { \
+// RUN: key: modernize-use-std-format.ReplacementFormatFunction, \
+// RUN: value: 'fmt::format' \
+// RUN: }, \
+// RUN: { \
+// RUN: key: modernize-use-std-format.FormatHeader, \
+// RUN: value: '<fmt/core.h>' \
+// RUN: } \
+// RUN: ] \
+// RUN: }" \
+// RUN: -- -isystem %clang_tidy_headers
+// RUN: %check_clang_tidy -check-suffixes=,NOTSTRICT \
+// RUN: -std=c++20 %s modernize-use-std-format %t -- \
+// RUN: -config="{CheckOptions: \
+// RUN: [ \
+// RUN: { \
+// RUN: key: modernize-use-std-format.StrFormatLikeFunctions, \
+// RUN: value: '::strprintf; mynamespace::strprintf2' \
+// RUN: }, \
+// RUN: { \
+// RUN: key: modernize-use-std-format.ReplacementFormatFunction, \
+// RUN: value: 'fmt::format' \
+// RUN: }, \
+// RUN: { \
+// RUN: key: modernize-use-std-format.FormatHeader, \
+// RUN: value: '<fmt/core.h>' \
+// RUN: } \
+// RUN: ] \
+// RUN: }" \
+// RUN: -- -isystem %clang_tidy_headers
+
+#include <cstdio>
+#include <string>
+// CHECK-FIXES: #include <fmt/core.h>
+
+std::string strprintf(const char *, ...);
+
+namespace mynamespace {
+ std::string strprintf2(const char *, ...);
+}
+
+std::string strprintf_test(const std::string &name, double value) {
+ return strprintf("'%s'='%f'\n", name.c_str(), value);
+ // CHECK...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/90397
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