[PATCH] Fix ICE in Clang when dealing with attribute(__no_sanitize_*__)
Aaron Ballman via cfe-commits
cfe-commits at lists.llvm.org
Thu Oct 8 11:40:42 PDT 2015
On Thu, Oct 8, 2015 at 2:33 PM, Adrian Zgorzalek <adek at fb.com> wrote:
> I so much like this fast review cycle :)
I aim to please. ;-)
>
> Comments applied.
LGTM with one nit:
+static bool normalizeName(StringRef& AttrName) {
Should be (StringRef &AttrName) per style guidelines. A good idea is
to run clang-format over the patch or modified code, that fixes these
sort of things handily.
Thanks!
~Aaron
>
> Adrian
>
>
>> On Oct 8, 2015, at 11:24 AM, Aaron Ballman <aaron at aaronballman.com> wrote:
>>
>> On Thu, Oct 8, 2015 at 12:46 PM, Adrian Zgorzalek <adek at fb.com> wrote:
>>> Feedback applied, new patch in the attachment.
>>
>> Thank you for working on this! A few comments:
>>
>>> From 13f4df6def5f26768f9ea048e013f779bb4a7814 Mon Sep 17 00:00:00 2001
>>> From: =?UTF-8?q?Adrian=20Zgorza=C5=82ek?= <adek at fb.com>
>>> Date: Wed, 7 Oct 2015 15:55:53 -0700
>>> Subject: [PATCH] Fix ICE in Clang when dealing with
>>> attribute(__no_sanitize_*__)
>>>
>>> Summary:
>>>
>>> Both syntaxes: __attribute__((no_sanitize_address)) and
>>> __attribute__((__no_sanitize__address__)) are valid, following
>>> documentation:
>>>
>>>> The attribute identifier (but not scope) can also be specified with a
>>>> preceding and following __ (double underscore) to avoid interference
>>>> from a macro with the same name. For instance, gnu::__const__ can be
>>>> used instead of gnu::const.
>>>
>>> This patch is fixing ICE when __const__ syntax is used.
>>>
>>> Test Plan:
>>>
>>> Added unittests in the patch which cover these cases. After applying
>>> this patch they don't crash anymore.
>>> ---
>>> lib/Sema/SemaDeclAttr.cpp | 28
>>> +++++++++++++++++-----------
>>> test/SemaCXX/attr-no-sanitize-address.cpp | 2 ++
>>> test/SemaCXX/attr-no-sanitize-memory.cpp | 2 ++
>>> test/SemaCXX/attr-no-sanitize-thread.cpp | 2 ++
>>> 4 files changed, 23 insertions(+), 11 deletions(-)
>>
>> FWIW, it's usually better to supply svn patches instead of git patches
>> (my vcs has troubles applying patches like this).
>>
>>>
>>> diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
>>> index 3cf9567..b2f2cff 100644
>>> --- a/lib/Sema/SemaDeclAttr.cpp
>>> +++ b/lib/Sema/SemaDeclAttr.cpp
>>> @@ -1308,6 +1308,17 @@ void Sema::AddAssumeAlignedAttr(SourceRange
>>> AttrRange, Decl *D, Expr *E,
>>> AssumeAlignedAttr(AttrRange, Context, E, OE,
>>> SpellingListIndex));
>>> }
>>>
>>> +/// Normalize the attribute, __foo__ becomes foo.
>>> +/// Returns true if normalization was applied.
>>> +static bool normalizeAttrName(StringRef& AttrName) {
>>
>> I would prefer this be called normalizeName since it doesn't just
>> normalize attribute names (for instance, this is used to normalize
>> attribute arguments as well).
>>
>>> + if (AttrName.startswith("__") && AttrName.endswith("__")) {
>>> + assert(AttrName.size() > 4 && "Too short attribute name");
>>
>> "Name too short" instead.
>>
>>> + AttrName = AttrName.substr(2, AttrName.size() - 4);
>>
>> I prefer: drop_front() and drop_back() instead.
>>
>>> + return true;
>>> + }
>>> + return false;
>>> +}
>>> +
>>> static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList
>>> &AL) {
>>> // This attribute must be applied to a function declaration. The first
>>> // argument to the attribute must be an identifier, the name of the
>>> resource,
>>> @@ -1349,11 +1360,8 @@ static void handleOwnershipAttr(Sema &S, Decl *D,
>>> const AttributeList &AL) {
>>>
>>> IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;
>>>
>>> - // Normalize the argument, __foo__ becomes foo.
>>> StringRef ModuleName = Module->getName();
>>> - if (ModuleName.startswith("__") && ModuleName.endswith("__") &&
>>> - ModuleName.size() > 4) {
>>> - ModuleName = ModuleName.drop_front(2).drop_back(2);
>>> + if (normalizeAttrName(ModuleName)) {
>>> Module = &S.PP.getIdentifierTable().get(ModuleName);
>>> }
>>>
>>> @@ -2648,9 +2656,7 @@ static void handleFormatAttr(Sema &S, Decl *D,
>>> const AttributeList &Attr) {
>>> IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
>>> StringRef Format = II->getName();
>>>
>>> - // Normalize the argument, __foo__ becomes foo.
>>> - if (Format.startswith("__") && Format.endswith("__")) {
>>> - Format = Format.substr(2, Format.size() - 4);
>>> + if (normalizeAttrName(Format)) {
>>> // If we've modified the string name, we need a new identifier for
>>> it.
>>> II = &S.Context.Idents.get(Format);
>>> }
>>> @@ -3131,9 +3137,7 @@ static void handleModeAttr(Sema &S, Decl *D, const
>>> AttributeList &Attr) {
>>> IdentifierInfo *Name = Attr.getArgAsIdent(0)->Ident;
>>> StringRef Str = Name->getName();
>>>
>>> - // Normalize the attribute name, __foo__ becomes foo.
>>> - if (Str.startswith("__") && Str.endswith("__"))
>>> - Str = Str.substr(2, Str.size() - 4);
>>> + static_cast<void>(normalizeAttrName(Str));
>>
>> No need for the static_cast to void here; we're okay ignoring this
>> return value implicitly.
>>
>>>
>>> unsigned DestWidth = 0;
>>> bool IntegerMode = true;
>>> @@ -4533,8 +4537,10 @@ static void handleNoSanitizeAttr(Sema &S, Decl *D,
>>> const AttributeList &Attr) {
>>>
>>> static void handleNoSanitizeSpecificAttr(Sema &S, Decl *D,
>>> const AttributeList &Attr) {
>>> + StringRef AttrName = Attr.getName()->getName();
>>> + static_cast<void>(normalizeAttrName(AttrName));
>>
>> No need for the static_cast here either.
>>
>> ~Aaron
>>
>>> std::string SanitizerName =
>>> - llvm::StringSwitch<std::string>(Attr.getName()->getName())
>>> + llvm::StringSwitch<std::string>(AttrName)
>>> .Case("no_address_safety_analysis", "address")
>>> .Case("no_sanitize_address", "address")
>>> .Case("no_sanitize_thread", "thread")
>>> diff --git a/test/SemaCXX/attr-no-sanitize-address.cpp
>>> b/test/SemaCXX/attr-no-sanitize-address.cpp
>>> index 9ca2863..9499742 100644
>>> --- a/test/SemaCXX/attr-no-sanitize-address.cpp
>>> +++ b/test/SemaCXX/attr-no-sanitize-address.cpp
>>> @@ -8,6 +8,8 @@
>>>
>>> void noanal_fun() NO_SANITIZE_ADDRESS;
>>>
>>> +void noanal_fun_alt() __attribute__((__no_sanitize_address__));
>>> +
>>> void noanal_fun_args() __attribute__((no_sanitize_address(1))); // \
>>> // expected-error {{'no_sanitize_address' attribute takes no
>>> arguments}}
>>>
>>> diff --git a/test/SemaCXX/attr-no-sanitize-memory.cpp
>>> b/test/SemaCXX/attr-no-sanitize-memory.cpp
>>> index 9cbcb03..41809a0 100644
>>> --- a/test/SemaCXX/attr-no-sanitize-memory.cpp
>>> +++ b/test/SemaCXX/attr-no-sanitize-memory.cpp
>>> @@ -8,6 +8,8 @@
>>>
>>> void noanal_fun() NO_SANITIZE_MEMORY;
>>>
>>> +void noanal_fun_alt() __attribute__((__no_sanitize_memory__));
>>> +
>>> void noanal_fun_args() __attribute__((no_sanitize_memory(1))); // \
>>> // expected-error {{'no_sanitize_memory' attribute takes no arguments}}
>>>
>>> diff --git a/test/SemaCXX/attr-no-sanitize-thread.cpp
>>> b/test/SemaCXX/attr-no-sanitize-thread.cpp
>>> index 6cb9c71..d97e050 100644
>>> --- a/test/SemaCXX/attr-no-sanitize-thread.cpp
>>> +++ b/test/SemaCXX/attr-no-sanitize-thread.cpp
>>> @@ -8,6 +8,8 @@
>>>
>>> void noanal_fun() NO_SANITIZE_THREAD;
>>>
>>> +void noanal_fun_alt() __attribute__((__no_sanitize_thread__));
>>> +
>>> void noanal_fun_args() __attribute__((no_sanitize_thread(1))); // \
>>> // expected-error {{'no_sanitize_thread' attribute takes no arguments}}
>>>
>>> --
>>> 1.8.0
>>>
>>>
>
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