JustinStitt wrote:
> My intuition is that @kees approach could be more efficient to get things
> done :) Maintaining a list of types can be annoying.
We discussed this at [Linux Plumbers '24](https://lpc.events/) and also on
[lkml](https://lore.kernel.org/all/202404291502.612E0A10@keescook/) w
@@ -15,8 +15,9 @@ file at compile-time.
Goal and usage
==
-Users of sanitizer tools, such as :doc:`AddressSanitizer`,
:doc:`ThreadSanitizer`
-or :doc:`MemorySanitizer` may want to disable or alter some checks for
+Users of sanitizer tools, such as :doc:`AddressSan
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@@ -6664,6 +6664,13 @@ def err_builtin_counted_by_ref_invalid_lhs_use : Error<
def err_builtin_counted_by_ref_has_side_effects : Error<
"'__builtin_counted_by_ref' argument cannot have side-effects">;
+def warn_wraps_attr_var_decl_type_not_integer : Warning<
+ "using attrib
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>From b5515eba87ffd96d010952bf18fe4044861df298 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 01/12] add wraps, no_wraps attributes
---
clang/docs/ReleaseN
@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
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@@ -67,9 +67,11 @@ types specified within an ignorelist.
int a = 2147483647; // INT_MAX
++a;// Normally, an overflow with
-fsanitize=signed-integer-overflow
}
+
JustinStitt wrote:
I don't have commit access, but I'll revert that whit
@@ -433,6 +433,26 @@ Attribute Changes in Clang
- Fix a bug where clang doesn't automatically apply the ``[[gsl::Owner]]`` or
``[[gsl::Pointer]]`` to STL explicit template specialization decls.
(#GH109442)
+- Introduced ``__attribute__((wraps))`` which can be added to type
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@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
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@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
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@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
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@@ -0,0 +1,48 @@
+// RUN: %clang_cc1 %s -verify -fsyntax-only -triple x86_64-pc-linux-gnu
+typedef int __attribute__((wraps)) wrapping_int;
JustinStitt wrote:
> Can we test more types?
Yes, I'll add some more tests 😄
>
> Can the attributes be applied to point
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@@ -433,6 +433,26 @@ Attribute Changes in Clang
- Fix a bug where clang doesn't automatically apply the ``[[gsl::Owner]]`` or
``[[gsl::Pointer]]`` to STL explicit template specialization decls.
(#GH109442)
+- Introduced ``__attribute__((wraps))`` which can be added to type
@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
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@@ -6536,6 +6536,30 @@ static void HandleBTFTypeTagAttribute(QualType &Type,
const ParsedAttr &Attr,
::new (Ctx) BTFTypeTagAttr(Ctx, Attr, BTFTypeTag), Type);
}
+static void handleWrapsAttr(QualType &Type, const ParsedAttr &Attr,
+TypeProcess
@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
https://github.com/JustinStitt updated
https://github.com/llvm/llvm-project/pull/115094
>From b5515eba87ffd96d010952bf18fe4044861df298 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 01/15] add wraps, no_wraps attributes
---
clang/docs/ReleaseN
@@ -8710,3 +8710,103 @@ Declares that a function potentially allocates heap
memory, and prevents any pot
of ``nonallocating`` by the compiler.
}];
}
+
+def WrapsDocs : Documentation {
+ let Category = DocCatField;
+ let Content = [{
+The ``wraps`` attribute can be used wit
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>From b5515eba87ffd96d010952bf18fe4044861df298 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 01/14] add wraps, no_wraps attributes
---
clang/docs/ReleaseN
@@ -10818,11 +10819,39 @@ static bool IsImplicitBoolFloatConversion(Sema &S,
Expr *Ex, bool ToBool) {
FloatCandidateBT && (FloatCandidateBT->isFloatingPoint()));
}
+/// Check to see if the wraps or no_wraps attribute may have been lost through
+/// a function call.
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@@ -4852,6 +4862,10 @@ BinaryOperator::BinaryOperator(const ASTContext &Ctx,
Expr *lhs, Expr *rhs,
if (hasStoredFPFeatures())
setStoredFPFeatures(FPFeatures);
setDependence(computeDependence(this));
+ if (hasWrappingOperand(Ctx))
JustinStitt wrote:
A
@@ -6664,6 +6664,13 @@ def err_builtin_counted_by_ref_invalid_lhs_use : Error<
def err_builtin_counted_by_ref_has_side_effects : Error<
"'__builtin_counted_by_ref' argument cannot have side-effects">;
+def warn_wraps_attr_var_decl_type_not_integer : Warning<
@@ -6664,6 +6664,13 @@ def err_builtin_counted_by_ref_invalid_lhs_use : Error<
def err_builtin_counted_by_ref_has_side_effects : Error<
"'__builtin_counted_by_ref' argument cannot have side-effects">;
+def warn_wraps_attr_var_decl_type_not_integer : Warning<
+ "using attrib
@@ -831,6 +831,28 @@ ASTContext::getCanonicalTemplateTemplateParmDecl(
return CanonTTP;
}
+/// Check if a type can have its sanitizer instrumentation elided.
+/// Determine this by its presence in a SCL alongside its specified categories.
+/// For example:
+/// ignorelist.tx
https://github.com/JustinStitt updated
https://github.com/llvm/llvm-project/pull/107332
>From 548efc6414503f8ae005f1bd9ef2c7f15ad16241 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 3 Sep 2024 18:28:53 -0700
Subject: [PATCH 01/12] hook up sscl categories with overflow/truncation
saniti
@@ -433,6 +433,26 @@ Attribute Changes in Clang
- Fix a bug where clang doesn't automatically apply the ``[[gsl::Owner]]`` or
``[[gsl::Pointer]]`` to STL explicit template specialization decls.
(#GH109442)
+- Introduced ``__attribute__((wraps))`` which can be added to type
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@@ -1,7 +1,28 @@
+// Verify ubsan doesn't emit checks for ignorelisted types
+// RUN: echo "[{unsigned-integer-overflow,signed-integer-overflow}]" >
%t-int.ignorelist
+// RUN: echo "type:int" >> %t-int.ignorelist
+// RUN: %clang_cc1 -triple x86_64-linux-gnu
-fsanitize=signed-int
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https://github.com/llvm/llvm-project/pull/107332
>From 548efc6414503f8ae005f1bd9ef2c7f15ad16241 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 3 Sep 2024 18:28:53 -0700
Subject: [PATCH 1/4] hook up sscl categories with overflow/truncation
sanitize
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>From 548efc6414503f8ae005f1bd9ef2c7f15ad16241 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 3 Sep 2024 18:28:53 -0700
Subject: [PATCH 1/5] hook up sscl categories with overflow/truncation
sanitize
@@ -48,6 +49,63 @@ Example
$ clang -fsanitize=address -fsanitize-ignorelist=ignorelist.txt foo.c ;
./a.out
# No error report here.
+Usage with UndefinedBehaviorSanitizer
+=
+
+The arithmetic overflow sanitizers ``unsigned-integer-overfl
@@ -817,6 +817,37 @@ ASTContext::getCanonicalTemplateTemplateParmDecl(
return CanonTTP;
}
+/// Check if a type can have its sanitizer instrumentation elided.
+/// Determine this by its presence in a SCL alongside its specified categories.
+/// For example:
+/// ignorelist.tx
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@@ -48,6 +49,63 @@ Example
$ clang -fsanitize=address -fsanitize-ignorelist=ignorelist.txt foo.c ;
./a.out
# No error report here.
+Usage with UndefinedBehaviorSanitizer
+=
+
+The arithmetic overflow sanitizers ``unsigned-integer-overfl
@@ -817,6 +817,37 @@ ASTContext::getCanonicalTemplateTemplateParmDecl(
return CanonTTP;
}
+/// Check if a type can have its sanitizer instrumentation elided.
+/// Determine this by its presence in a SCL alongside its specified categories.
+/// For example:
+/// ignorelist.tx
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>From f58e6481650f8cda6089b2a0637c94596a45370e Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 1/5] add wraps, no_wraps attributes
---
clang/docs/ReleaseNot
https://github.com/JustinStitt updated
https://github.com/llvm/llvm-project/pull/115094
>From f58e6481650f8cda6089b2a0637c94596a45370e Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 1/6] add wraps, no_wraps attributes
---
clang/docs/ReleaseNot
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>From b5515eba87ffd96d010952bf18fe4044861df298 Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 1/6] add wraps, no_wraps attributes
---
clang/docs/ReleaseNot
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@@ -67,9 +67,11 @@ types specified within an ignorelist.
int a = 2147483647; // INT_MAX
++a;// Normally, an overflow with
-fsanitize=signed-integer-overflow
}
+
JustinStitt wrote:
The wraps docs reference the SSCL docs and I fixed so
https://github.com/JustinStitt updated
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>From f58e6481650f8cda6089b2a0637c94596a45370e Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 1/5] add wraps, no_wraps attributes
---
clang/docs/ReleaseNot
@@ -4142,6 +4142,12 @@ class BinaryOperator : public Expr {
return getFPFeaturesInEffect(LO).getAllowFEnvAccess();
}
+ /// Does one of the subexpressions have the wraps attribute?
+ bool hasWrappingOperand(const ASTContext &Ctx) const;
+
+ /// How about the no_wraps a
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>From f58e6481650f8cda6089b2a0637c94596a45370e Mon Sep 17 00:00:00 2001
From: Justin Stitt
Date: Tue, 5 Mar 2024 03:14:49 +
Subject: [PATCH 1/6] add wraps, no_wraps attributes
---
clang/docs/ReleaseNot
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JustinStitt wrote:
@vitalybuka
> Would it make sense to support attributes like
> `__attribute__((no_sanitize("-undefined")))` ? Seems like better
> representation of the fact that we want to undo sanitizer suppression.
I am working on the PR for supporting `__attribute__((no_sanitize()))` fo
@@ -6536,6 +6536,30 @@ static void HandleBTFTypeTagAttribute(QualType &Type,
const ParsedAttr &Attr,
::new (Ctx) BTFTypeTagAttr(Ctx, Attr, BTFTypeTag), Type);
}
+static void handleWrapsAttr(QualType &Type, const ParsedAttr &Attr,
+TypeProcess
@@ -4852,6 +4862,10 @@ BinaryOperator::BinaryOperator(const ASTContext &Ctx,
Expr *lhs, Expr *rhs,
if (hasStoredFPFeatures())
setStoredFPFeatures(FPFeatures);
setDependence(computeDependence(this));
+ if (hasWrappingOperand(Ctx))
JustinStitt wrote:
I
JustinStitt wrote:
@erichkeane
> Also, did we have an RFC on this? I'd like to see what the community at large
> has to say.
Yes, here's the
[RFC](https://discourse.llvm.org/t/rfc-add-wraps-attribute-for-granular-integer-overflow-handling/77670)
and the [previous PR](https://github.com/llvm/
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JustinStitt wrote:
> > @vitalybuka any idea how lldb-server is failing with `UNRESOLVED`? How in
> > the world are any of the changes here affecting lldb-server?
>
> flake?
I believe it was unrelated to this PR
https://github.com/llvm/llvm-project/pull/107332
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JustinStitt wrote:
RFC regarding canonical wrapping/non-wrapping types in Clang:
https://discourse.llvm.org/t/rfc-clang-canonical-wrapping-and-non-wrapping-types/84356
Ultimately, a type like what the RFC describes would supersede this PR in terms
of feature completeness and usefulness. I'll c
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@@ -34,7 +34,11 @@ bool NoSanitizeList::containsGlobal(SanitizerMask Mask,
StringRef GlobalName,
bool NoSanitizeList::containsType(SanitizerMask Mask, StringRef
MangledTypeName,
StringRef Category) const {
- return SSCL->inSection(Mask, "ty
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LGTM (but I don't have official powers to `Approve`).
https://github.com/llvm/llvm-project/pull/142006
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JustinStitt wrote:
superseded by https://github.com/llvm/llvm-project/pull/148914.
closing this.
https://github.com/llvm/llvm-project/pull/115094
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https://github.com/JustinStitt approved this pull request.
Again, can't give any comprehensive code critiques but you addressed my nits
and such so LGTM.
https://github.com/llvm/llvm-project/pull/151590
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@@ -5076,6 +5075,78 @@ the configuration (without a prefix: ``Auto``).
For example: TESTSUITE
+.. _NumericLiteralCase:
+
+**NumericLiteralCase** (``NumericLiteralCaseStyle``)
:versionbadge:`clang-format 21` :ref:`¶ `
+ Controls character case in numeric literals.
+
+ Pos
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JustinStitt wrote:
Hi Ilya,
I did some testing and found an inconsistency in the behaviors between
exporting entire namespaces or exporting declarations within a namespace
piecemeal.
See this test
```cpp
export module some_lib;
namespace piecemeal { // line 3
export int add_one(int n) { re
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@@ -5076,6 +5075,78 @@ the configuration (without a prefix: ``Auto``).
For example: TESTSUITE
+.. _NumericLiteralCase:
+
+**NumericLiteralCase** (``NumericLiteralCaseStyle``)
:versionbadge:`clang-format 21` :ref:`¶ `
JustinStitt wrote:
Let's go with `clan
@@ -0,0 +1,368 @@
+//===--- NumericLiteralCaseFixer.cpp ---*- 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
JustinStitt wrote:
gentle ping.
https://github.com/llvm/llvm-project/pull/148914
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https://github.com/llvm/llvm-project/pull/151995
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https://github.com/JustinStitt approved this pull request.
https://github.com/llvm/llvm-project/pull/151995
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@@ -43,6 +43,26 @@ C++ Specific Potentially Breaking Changes
regressions if your build system supports two-phase compilation model but
haven't support
reduced BMI or it is a compiler bug or a bug in users code.
+- Clang now correctly diagnoses during constant expression e
https://github.com/JustinStitt approved this pull request.
https://github.com/llvm/llvm-project/pull/150829
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