paulaltin created this revision.
Herald added subscribers: carlosgalvezp, shchenz, kbarton, nemanjai.
paulaltin requested review of this revision.
Herald added a project: clang-tools-extra.
Herald added a subscriber: cfe-commits.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D112881
Files:
clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.cpp
clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h
clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-narrowing-conversions.rst
clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-narrowing-conversions-narrowingintegertofloatingpoint-option.cpp
Index: clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-narrowing-conversions-narrowingintegertofloatingpoint-option.cpp
===================================================================
--- /dev/null
+++ clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-narrowing-conversions-narrowingintegertofloatingpoint-option.cpp
@@ -0,0 +1,13 @@
+// RUN: %check_clang_tidy -check-suffix=DEFAULT %s \
+// RUN: cppcoreguidelines-narrowing-conversions %t -- \
+// RUN: -config='{CheckOptions: [{key: cppcoreguidelines-narrowing-conversions.WarnOnIntegerToFloatingPointNarrowingConversion, value: true}]}'
+
+// RUN: %check_clang_tidy -check-suffix=DISABLED %s \
+// RUN: cppcoreguidelines-narrowing-conversions %t -- \
+// RUN: -config='{CheckOptions: [{key: cppcoreguidelines-narrowing-conversions.WarnOnIntegerToFloatingPointNarrowingConversion, value: false}]}'
+
+void foo(size_t value) {
+ double a = value;
+ // CHECK-MESSAGES-DEFAULT: :[[@LINE-1]]:11: warning: narrowing conversion from 'size_t' (aka 'unsigned long') to 'double' [cppcoreguidelines-narrowing-conversions]
+ // DISABLED: No warning for integer to floating-point narrowing conversions when WarnOnIntegerToFloatingPointNarrowingConversion = false.
+}
Index: clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-narrowing-conversions.rst
===================================================================
--- clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-narrowing-conversions.rst
+++ clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-narrowing-conversions.rst
@@ -15,7 +15,8 @@
We enforce only part of the guideline, more specifically, we flag narrowing conversions from:
- an integer to a narrower integer (e.g. ``char`` to ``unsigned char``)
if WarnOnIntegerNarrowingConversion Option is set,
- - an integer to a narrower floating-point (e.g. ``uint64_t`` to ``float``),
+ - an integer to a narrower floating-point (e.g. ``uint64_t`` to ``float``)
+ if WarnOnIntegerToFloatingPointNarrowingConversion Option is set,
- a floating-point to an integer (e.g. ``double`` to ``int``),
- a floating-point to a narrower floating-point (e.g. ``double`` to ``float``)
if WarnOnFloatingPointNarrowingConversion Option is set.
@@ -36,6 +37,11 @@
When `true`, the check will warn on narrowing integer conversion
(e.g. ``int`` to ``size_t``). `true` by default.
+.. option:: WarnOnIntegerToFloatingPointNarrowingConversion
+
+ When `true`, the check will warn on narrowing integer to floating-point
+ conversion (e.g. ``size_t`` to ``double``). `true` by default.
+
.. option:: WarnOnFloatingPointNarrowingConversion
When `true`, the check will warn on narrowing floating point conversion
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h
===================================================================
--- clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h
@@ -98,6 +98,7 @@
const BuiltinType &ToType) const;
const bool WarnOnIntegerNarrowingConversion;
+ const bool WarnOnIntegerToFloatingPointNarrowingConversion;
const bool WarnOnFloatingPointNarrowingConversion;
const bool WarnWithinTemplateInstantiation;
const bool WarnOnEquivalentBitWidth;
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.cpp
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.cpp
@@ -37,6 +37,8 @@
: ClangTidyCheck(Name, Context),
WarnOnIntegerNarrowingConversion(
Options.get("WarnOnIntegerNarrowingConversion", true)),
+ WarnOnIntegerToFloatingPointNarrowingConversion(
+ Options.get("WarnOnIntegerToFloatingPointNarrowingConversion", true)),
WarnOnFloatingPointNarrowingConversion(
Options.get("WarnOnFloatingPointNarrowingConversion", true)),
WarnWithinTemplateInstantiation(
@@ -49,6 +51,8 @@
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "WarnOnIntegerNarrowingConversion",
WarnOnIntegerNarrowingConversion);
+ Options.store(Opts, "WarnOnIntegerToFloatingPointNarrowingConversion",
+ WarnOnIntegerToFloatingPointNarrowingConversion);
Options.store(Opts, "WarnOnFloatingPointNarrowingConversion",
WarnOnFloatingPointNarrowingConversion);
Options.store(Opts, "WarnWithinTemplateInstantiation",
@@ -376,19 +380,21 @@
void NarrowingConversionsCheck::handleIntegralToFloating(
const ASTContext &Context, SourceLocation SourceLoc, const Expr &Lhs,
const Expr &Rhs) {
- const BuiltinType *ToType = getBuiltinType(Lhs);
- llvm::APSInt IntegerConstant;
- if (getIntegerConstantExprValue(Context, Rhs, IntegerConstant)) {
- if (!isWideEnoughToHold(Context, IntegerConstant, *ToType))
- diagNarrowIntegerConstant(SourceLoc, Lhs, Rhs, IntegerConstant);
- return;
- }
+ if (WarnOnIntegerToFloatingPointNarrowingConversion) {
+ const BuiltinType *ToType = getBuiltinType(Lhs);
+ llvm::APSInt IntegerConstant;
+ if (getIntegerConstantExprValue(Context, Rhs, IntegerConstant)) {
+ if (!isWideEnoughToHold(Context, IntegerConstant, *ToType))
+ diagNarrowIntegerConstant(SourceLoc, Lhs, Rhs, IntegerConstant);
+ return;
+ }
- const BuiltinType *FromType = getBuiltinType(Rhs);
- if (isWarningInhibitedByEquivalentSize(Context, *FromType, *ToType))
- return;
- if (!isWideEnoughToHold(Context, *FromType, *ToType))
- diagNarrowType(SourceLoc, Lhs, Rhs);
+ const BuiltinType *FromType = getBuiltinType(Rhs);
+ if (isWarningInhibitedByEquivalentSize(Context, *FromType, *ToType))
+ return;
+ if (!isWideEnoughToHold(Context, *FromType, *ToType))
+ diagNarrowType(SourceLoc, Lhs, Rhs);
+ }
}
void NarrowingConversionsCheck::handleFloatingToIntegral(
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