r249721 - When mapping no_sanitize_* attributes to no_sanitize attributes, handle GNU-style formatting that involves prefix and suffix underscores. Cleans up other usages of similar functionality.
Aaron Ballman via cfe-commits
cfe-commits at lists.llvm.org
Thu Oct 8 13:52:49 PDT 2015
On Thu, Oct 8, 2015 at 4:49 PM, Richard Smith <richard at metafoo.co.uk> wrote:
> On Thu, Oct 8, 2015 at 1:21 PM, Aaron Ballman <aaron at aaronballman.com>
> wrote:
>>
>> On Thu, Oct 8, 2015 at 4:16 PM, Richard Smith <richard at metafoo.co.uk>
>> wrote:
>> > On Thu, Oct 8, 2015 at 12:24 PM, Aaron Ballman via cfe-commits
>> > <cfe-commits at lists.llvm.org> wrote:
>> >>
>> >> Author: aaronballman
>> >> Date: Thu Oct 8 14:24:08 2015
>> >> New Revision: 249721
>> >>
>> >> URL: http://llvm.org/viewvc/llvm-project?rev=249721&view=rev
>> >> Log:
>> >> When mapping no_sanitize_* attributes to no_sanitize attributes, handle
>> >> GNU-style formatting that involves prefix and suffix underscores.
>> >> Cleans up
>> >> other usages of similar functionality.
>> >>
>> >> Patch by Adrian Zgorzalek!
>> >>
>> >> Modified:
>> >> cfe/trunk/lib/Sema/SemaDeclAttr.cpp
>> >> cfe/trunk/test/SemaCXX/attr-no-sanitize-address.cpp
>> >> cfe/trunk/test/SemaCXX/attr-no-sanitize-memory.cpp
>> >> cfe/trunk/test/SemaCXX/attr-no-sanitize-thread.cpp
>> >>
>> >> Modified: cfe/trunk/lib/Sema/SemaDeclAttr.cpp
>> >> URL:
>> >>
>> >> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDeclAttr.cpp?rev=249721&r1=249720&r2=249721&view=diff
>> >>
>> >>
>> >> ==============================================================================
>> >> --- cfe/trunk/lib/Sema/SemaDeclAttr.cpp (original)
>> >> +++ cfe/trunk/lib/Sema/SemaDeclAttr.cpp Thu Oct 8 14:24:08 2015
>> >> @@ -1308,6 +1308,17 @@ void Sema::AddAssumeAlignedAttr(SourceRa
>> >> AssumeAlignedAttr(AttrRange, Context, E, OE,
>> >> SpellingListIndex));
>> >> }
>> >>
>> >> +/// Normalize the attribute, __foo__ becomes foo.
>> >> +/// Returns true if normalization was applied.
>> >> +static bool normalizeName(StringRef &AttrName) {
>> >> + if (AttrName.startswith("__") && AttrName.endswith("__")) {
>> >> + assert(AttrName.size() > 4 && "Name too short");
>> >
>> >
>> > This assert will fire on the strings __, ___, and ____, which are valid
>> > in
>> > some of the below cases.
>>
>> That assert won't fire on anything but ____ because it's &&, not ||.
>
>
> I disagree. __ starts with __ and ends with __. The right thing to do here
> is remove the assert and put back the AttrName.size() > 4 check that the
> callers used to have.
Hah, you are correct. I hadn't considered that point. I agree with you. :-)
~Aaron
>
>> I
>> don't think these names were intended to be valid in their uses.
>> However, you are correct that this will trigger assertions instead of
>> diagnostics. Adrian, can you investigate?
>>
>> >
>> >>
>> >> + AttrName = AttrName.drop_front(2).drop_back(2);
>> >> + 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,
>> >>
>> >> 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 (normalizeName(ModuleName)) {
>> >> Module = &S.PP.getIdentifierTable().get(ModuleName);
>> >> }
>> >>
>> >> @@ -2648,9 +2656,7 @@ static void handleFormatAttr(Sema &S, De
>> >> 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 (normalizeName(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
>> >> 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);
>> >> + normalizeName(Str);
>> >>
>> >> unsigned DestWidth = 0;
>> >> bool IntegerMode = true;
>> >> @@ -4533,8 +4537,10 @@ static void handleNoSanitizeAttr(Sema &S
>> >>
>> >> static void handleNoSanitizeSpecificAttr(Sema &S, Decl *D,
>> >> const AttributeList &Attr) {
>> >> + StringRef AttrName = Attr.getName()->getName();
>> >> + normalizeName(AttrName);
>> >> 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")
>> >
>> >
>> > Is there any way we could use the spelling list index in this case
>> > rather
>> > than repeating the attribute names and __-stripping here?
>>
>> The spelling list index isn't exposed in a meaningful way (and I think
>> that would be an abuse of it; I want to someday remove that
>> implementation detail to something far more private).
>>
>> I was hoping there would be a way to use the semantic spelling, but
>> the issue is that this particular attribute doesn't have semantic
>> spellings. The NoSanitizeSpecificAttr would have one, but it has no
>> AST node to hang those off of. Since we explicitly document that we do
>> not want any additional names added to this list (see Attr.td line
>> 1500), I think this is a reasonable solution as-is.
>>
>> ~Aaron
>>
>> >
>> >> Modified: cfe/trunk/test/SemaCXX/attr-no-sanitize-address.cpp
>> >> URL:
>> >>
>> >> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/attr-no-sanitize-address.cpp?rev=249721&r1=249720&r2=249721&view=diff
>> >>
>> >>
>> >> ==============================================================================
>> >> --- cfe/trunk/test/SemaCXX/attr-no-sanitize-address.cpp (original)
>> >> +++ cfe/trunk/test/SemaCXX/attr-no-sanitize-address.cpp Thu Oct 8
>> >> 14:24:08 2015
>> >> @@ -5,12 +5,14 @@
>> >> #if !__has_attribute(no_sanitize_address)
>> >> #error "Should support no_sanitize_address"
>> >> #endif
>> >> -
>> >> -void noanal_fun() NO_SANITIZE_ADDRESS;
>> >> -
>> >> -void noanal_fun_args() __attribute__((no_sanitize_address(1))); // \
>> >> - // expected-error {{'no_sanitize_address' attribute takes no
>> >> arguments}}
>> >> -
>> >> +
>> >> +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}}
>> >> +
>> >> int noanal_testfn(int y) NO_SANITIZE_ADDRESS;
>> >>
>> >> int noanal_testfn(int y) {
>> >>
>> >> Modified: cfe/trunk/test/SemaCXX/attr-no-sanitize-memory.cpp
>> >> URL:
>> >>
>> >> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/attr-no-sanitize-memory.cpp?rev=249721&r1=249720&r2=249721&view=diff
>> >>
>> >>
>> >> ==============================================================================
>> >> --- cfe/trunk/test/SemaCXX/attr-no-sanitize-memory.cpp (original)
>> >> +++ cfe/trunk/test/SemaCXX/attr-no-sanitize-memory.cpp Thu Oct 8
>> >> 14:24:08
>> >> 2015
>> >> @@ -5,12 +5,14 @@
>> >> #if !__has_attribute(no_sanitize_memory)
>> >> #error "Should support no_sanitize_memory"
>> >> #endif
>> >> -
>> >> -void noanal_fun() NO_SANITIZE_MEMORY;
>> >> -
>> >> -void noanal_fun_args() __attribute__((no_sanitize_memory(1))); // \
>> >> - // expected-error {{'no_sanitize_memory' attribute takes no
>> >> arguments}}
>> >> -
>> >> +
>> >> +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}}
>> >> +
>> >> int noanal_testfn(int y) NO_SANITIZE_MEMORY;
>> >>
>> >> int noanal_testfn(int y) {
>> >>
>> >> Modified: cfe/trunk/test/SemaCXX/attr-no-sanitize-thread.cpp
>> >> URL:
>> >>
>> >> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/attr-no-sanitize-thread.cpp?rev=249721&r1=249720&r2=249721&view=diff
>> >>
>> >>
>> >> ==============================================================================
>> >> --- cfe/trunk/test/SemaCXX/attr-no-sanitize-thread.cpp (original)
>> >> +++ cfe/trunk/test/SemaCXX/attr-no-sanitize-thread.cpp Thu Oct 8
>> >> 14:24:08
>> >> 2015
>> >> @@ -5,12 +5,14 @@
>> >> #if !__has_attribute(no_sanitize_thread)
>> >> #error "Should support no_sanitize_thread"
>> >> #endif
>> >> -
>> >> -void noanal_fun() NO_SANITIZE_THREAD;
>> >> -
>> >> -void noanal_fun_args() __attribute__((no_sanitize_thread(1))); // \
>> >> - // expected-error {{'no_sanitize_thread' attribute takes no
>> >> arguments}}
>> >> -
>> >> +
>> >> +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}}
>> >> +
>> >> int noanal_testfn(int y) NO_SANITIZE_THREAD;
>> >>
>> >> int noanal_testfn(int y) {
>> >>
>> >>
>> >> _______________________________________________
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>> >> cfe-commits at lists.llvm.org
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>> >
>> >
>
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