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path: root/lib/AST/ExprConstant.cpp
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2012-04-13Implement the missing pieces needed to support libstdc++4.7's <atomic>:Richard Smith
__atomic_test_and_set, __atomic_clear, plus a pile of undocumented __GCC_* predefined macros. Implement library fallback for __atomic_is_lock_free and __c11_atomic_is_lock_free, and implement __atomic_always_lock_free. Contrary to their documentation, GCC's __atomic_fetch_add family don't multiply the operand by sizeof(T) when operating on a pointer type. libstdc++ relies on this quirk. Remove this handling for all but the __c11_atomic_fetch_add and __c11_atomic_fetch_sub builtins. Contrary to their documentation, __atomic_test_and_set and __atomic_clear take a first argument of type 'volatile void *', not 'void *' or 'bool *', and __atomic_is_lock_free and __atomic_always_lock_free have an argument of type 'const volatile void *', not 'void *'. With this change, libstdc++4.7's <atomic> passes libc++'s atomic test suite, except for a couple of libstdc++ bugs and some cases where libc++'s test suite tests for properties which implementations have latitude to vary. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154640 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-11Provide, and document, a set of __c11_atomic_* intrinsics to implement C11'sRichard Smith
<stdatomic.h> header. In passing, fix LanguageExtensions to note that C11 and C++11 are no longer "upcoming standards" but are now actually standardized. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154513 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-08Don't forget to evaluate the subexpression in a null pointer cast. If we'reRichard Smith
converting from std::nullptr_t, the subexpression might have side-effects. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154278 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-06Implement support for null non-type template arguments for non-typeDouglas Gregor
template parameters of pointer, pointer-to-member, or nullptr_t type in C++11. Fixes PR9700 / <rdar://problem/11193097>. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154219 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-22Simplify DataRecursiveIntBinOpEvaluator::VisitBinOp() a bit and make sure we ↵Argyrios Kyrtzidis
don't evaluate RHS if LHS could not be evaluated and keepEvaluatingAfterFailure() is false. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153235 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-21Change the binary operator data recursive evaluator to not stop at the firstRichard Trieu
non-constant value encountered. This allows the evaluator to deduce that expressions like (x < 5 || true) is equal to true. Previously, it would visit x and determined that the entire expression is could not evaluated to a constant. This fixes PR12318. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153226 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-15[Sema] Introduce a data recursive evaluator specific to binary operators.Argyrios Kyrtzidis
This allows us to handle extreme cases of chained binary operators without causing stack overflow. The binary operators that are handled with the data recursive evaluator are comma, logical, or operators that have operands with integral or enumeration type. Part of rdar://10941790. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152819 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-15Remove hacky temporary fix of r151585.Argyrios Kyrtzidis
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152818 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-15Unrevert r152761 (reverted in r152772) with a fix for the issue which wasRichard Smith
breaking bootstrap. No test yet: it's quite hard to tickle the failure case. The specific testcase for this wouldn't be useful for testing anything more general than a reintroduction of this precise bug in any case. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152775 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-15Revert r152761 "Minor optimization to constant evaluation: don't botherDaniel Dunbar
computing expr source...", it breaks bootstrap. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152772 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-15Minor optimization to constant evaluation: don't bother computing expr sourceRichard Smith
locations for diagnostics we're not going to emit, and don't track the subobject designator outside C++11 (since we're not going to use it anyway). This seems to give about a 0.5% speedup on 403.gcc/combine.c, but the results were sufficiently noisy that I can't reject the null hypothesis. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152761 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-13Allow vectors to be constructed from constexpr function arguments inRichard Smith
constant expressions. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152665 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-11Unify naming of LangOptions variable/get function across the Clang stack ↵David Blaikie
(Lex to AST). The member variable is always "LangOpts" and the member function is always "getLangOpts". Reviewed by Chris Lattner git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152536 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-11Add a missing 'template' keyword.Douglas Gregor
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152526 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-10Remove BlockDeclRefExpr and introduce a bit on DeclRefExpr toJohn McCall
track whether the referenced declaration comes from an enclosing local context. I'm amenable to suggestions about the exact meaning of this bit. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152491 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-10Assign APValues by swapping from a temporary. Removes a bunch of unnecessaryRichard Smith
copy-construction, which Daniel Dunbar reports as giving a 0.75% speedup on 403.gcc/combine.c. The performance differences on my constexpr torture tests are below the noise floor. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152455 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-09[AST] Reduce Decl::getASTContext() calls.Daniel Dunbar
- This function is not at all free; pass it around along some hot paths instead of recomputing it deep inside various VarDecl methods. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152363 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-07AST representation for user-defined literals, plus just enough of semanticRichard Smith
analysis to make the AST representation testable. They are represented by a new UserDefinedLiteral AST node, which is a sugared CallExpr. All semantic properties, including full CodeGen support, are achieved for free by this representation. UserDefinedLiterals can never be dependent, so no custom instantiation behavior is required. They are mangled as if they were direct calls to the underlying literal operator. This matches g++'s apparent behavior (but not its actual mangling, which is broken for literal-operator-ids). User-defined *string* literals are now fully-operational, but the semantic analysis is quite hacky and needs more work. No other forms of user-defined literal are created yet, but the AST support for them is present. This patch committed after midnight because we had already hit the quota for new kinds of literal yesterday. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152211 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-07The constant folder's diagnosic mechanism is irrelevant for C; don't botherRichard Smith
producing a C-only diagnostic. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152181 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-06Add clang support for new Objective-C literal syntax for NSDictionary, NSArray,Ted Kremenek
NSNumber, and boolean literals. This includes both Sema and Codegen support. Included is also support for new Objective-C container subscripting. My apologies for the large patch. It was very difficult to break apart. The patch introduces changes to the driver as well to cause clang to link in additional runtime support when needed to support the new language features. Docs are forthcoming to document the implementation and behavior of these features. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152137 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-03constexpr: Remove APValue/CCValue distinction. It is no longer useful given theRichard Smith
resolution of core issue 1454. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151991 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-01Move llvm/ADT/SaveAndRestore.h -> llvm/Support/SaveAndRestore.h.Argyrios Kyrtzidis
Needs llvm update. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151829 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-27When evaluating integer expressions include a check for sub-expressionsArgyrios Kyrtzidis
depth and error if we exceed a max value, to make sure we avoid a stack overflow. This is a hacky temporary fix. rdar://10913206. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151585 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-27Revert testing code I committed by mistake in r151464.Argyrios Kyrtzidis
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151548 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-25Revert r151460 as it is not enough to address the issue.Argyrios Kyrtzidis
Original log: When evaluating integer expressions handle logical operators outside VisitBinaryOperator() to reduce stack pressure for source with huge number of logical operators. Fixes rdar://10913206. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151464 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-25When evaluating integer expressions handle logical operators outsideArgyrios Kyrtzidis
VisitBinaryOperator() to reduce stack pressure for source with huge number of logical operators. Fixes rdar://10913206. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151460 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-24When checking whether a reference to a variable is an ICE, look at the type ofRichard Smith
the declaration, not at the type of the DeclRefExpr, since within a lambda the DeclRefExpr can be more const than the declaration is. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151399 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-24Remove some trivial uses of hasTrivialCopyConstructor() andDouglas Gregor
hasTrivialMoveConstructor(). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151354 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-24Implement a new type trait __is_trivially_constructible(T, Args...)Douglas Gregor
that provides the behavior of the C++11 library trait std::is_trivially_constructible<T, Args...>, which can't be implemented purely as a library. Since __is_trivially_constructible can have zero or more arguments, I needed to add Yet Another Type Trait Expression Class, this one handling arbitrary arguments. The next step will be to migrate UnaryTypeTrait and BinaryTypeTrait over to this new, more general TypeTrait class. Fixes the Clang side of <rdar://problem/10895483> / PR12038. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151352 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-22Generate an AST for the conversion from a lambda closure type to aDouglas Gregor
block pointer that returns a block literal which captures (by copy) the lambda closure itself. Some aspects of the block literal are left unspecified, namely the capture variable (which doesn't actually exist) and the body (which will be filled in by IRgen because it can't be written as an AST). Because we're switching to this model, this patch also eliminates tracking the copy-initialization expression for the block capture of the conversion function, since that information is now embedded in the synthesized block literal. -1 side tables FTW. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151131 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-21Fix a crash in the diangostic code in EvalConstant. PR12043.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151100 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-19Refuse to compile global std::initializer_lists instead of doing completely ↵Sebastian Redl
the wrong thing. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150928 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-18Implement constant expression support for __real__ and __imag__ on lvalueRichard Smith
complex numbers. Treat complex numbers as arrays of the corresponding component type, in order to make std::complex behave properly if implemented in terms of _Complex T. Apparently libstdc++'s std::complex is implemented this way, and we were rejecting a member like this: constexpr double real() { return __real__ val; } because it was marked constexpr but unable to produce a constant expression. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150895 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-18Fix a problem in the GCC testsuite, exposed by r150557. Compound literalsRichard Smith
are represented as prvalues in C++; don't be fooled into thinking they're global lvalues. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150870 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-17Make sure all remaining parts of the constant evaluator are aware that an arrayRichard Smith
can be represented by an LValue, and use that to simplify the code a little. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150789 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-17PR12012: Fix a regression in r150419 where we would try (and fail) toRichard Smith
zero-initialize class types with virtual bases when constant-evaluating an initializer. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150770 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-16constexpr tidyups:Richard Smith
* Fix bug when determining whether && / || are potential constant expressions * Try harder when determining whether ?: is a potential constant expression * Produce a diagnostic on sizeof(VLA) to provide a better source location git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150657 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-15Implement DR1454. This allows all intermediate results in constant expressionsRichard Smith
to be core constant expressions (including pointers and references to temporaries), and makes constexpr calculations Turing-complete. A Turing machine simulator is included as a testcase. This opens up the possibilty of removing CCValue entirely, and removing some copies from the constant evaluator in the process, but that cleanup is not part of this change. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150557 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-15Split reinterpret_casts of member pointers out from CK_BitCast; thisJohn McCall
is general goodness because representations of member pointers are not always equivalent across member pointer types on all ABIs (even though this isn't really standard-endorsed). Take advantage of the new information to teach IR-generation how to do these reinterprets in constant initializers. Make sure this works when intermingled with hierarchy conversions (although this is not part of our motivating use case). Doing this in the constant-evaluator would probably have been better, but that would require a *lot* of extra structure in the representation of constant member pointers: you'd really have to track an arbitrary chain of hierarchy conversions and reinterpretations in order to get this right. Ultimately, this seems less complex. I also wasn't quite sure how to extend the constant evaluator to handle foldings that we don't actually want to treat as extended constant expressions. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150551 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-14constexpr: evaluation support for nullptr comparisons.Richard Smith
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150521 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-14Pending clear answer from WG21 on whether core issue 903 is intended to apply toRichard Smith
C++11 or just C++17, restrict the set of null pointer constants in C++11 mode back to those which were considered null in C++98. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150510 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-13Deal with a horrible C++11 special case. If a non-literal type has a constexprRichard Smith
constructor, and that constructor is used to initialize an object of static storage duration such that all members and bases are initialized by constant expressions, constant initialization is performed. In this case, the object can still have a non-trivial destructor, and if it does, we must emit a dynamic initializer which performs no initialization and instead simply registers that destructor. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150419 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-13Update constexpr implementation to match CWG's chosen approach for core issuesRichard Smith
1358, 1360, 1452 and 1453. - Instantiations of constexpr functions are always constexpr. This removes the need for separate declaration/definition checking, which is now gone. - This makes it possible for a constexpr function to be virtual, if they are only dependently virtual. Virtual calls to such functions are not constant expressions. - Likewise, it's now possible for a literal type to have virtual base classes. A constexpr constructor for such a type cannot actually produce a constant expression, though, so add a special-case diagnostic for a constructor call to such a type rather than trying to evaluate it. - Classes with trivial default constructors (for which value initialization can produce a fully-initialized value) are considered literal types. - Classes with volatile members are not literal types. - constexpr constructors can be members of non-literal types. We do not yet use static initialization for global objects constructed in this way. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150359 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-10Update to new resolution for DR1458. When taking the address of an object ofRichard Smith
incomplete class type which has an overloaded operator&, it's now just unspecified whether the overloaded operator or the builtin is used. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150234 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-09CWG issue 1405: mutable members are allowed in literal types, but can't undergoRichard Smith
lvalue-to-rvalue conversions in constant expressions. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150145 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-08Implement DR1458: Taking the address of an object of incomplete class type isRichard Smith
not a constant expression, because we can't tell whether the complete class type will have an overloaded operator&. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150066 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-08Implement the agreed resolution to DR1457: a signed left shift of a 1 bit intoRichard Smith
the sign bit doesn't have undefined behavior, but a signed left shift of a 1 bit out of the sign bit still does. As promised to Howard :) The suppression of the potential constant expression checking in system headers is also removed, since the problem it was working around is gone. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150059 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-07Revert my patches which removed Diagnostic.h includes by moving some ↵Benjamin Kramer
operator overloads out of line. This seems to negatively affect compile time onsome ObjC tests (which use a lot of partial diagnostics I assume). I have to come up with a way to keep them inline without including Diagnostic.h everywhere. Now adding a new diagnostic requires a full rebuild of e.g. the static analyzer which doesn't even use those diagnostics. This reverts commit 6496bd10dc3a6d5e3266348f08b6e35f8184bc99. This reverts commit 7af19b817ba964ac560b50c1ed6183235f699789. This reverts commit fdd15602a42bbe26185978ef1e17019f6d969aa7. This reverts commit 00bd44d5677783527d7517c1ffe45e4d75a0f56f. This reverts commit ef9b60ffed980864a8db26ad30344be429e58ff5. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150006 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-07Introduce basic ASTs for lambda expressions. This covers:Douglas Gregor
- Capturing variables by-reference and by-copy within a lambda - The representation of lambda captures - The creation of the non-static data members in the lambda class that store the captured variables - The initialization of the non-static data members from the captured variables - Pretty-printing lambda expressions There are a number of FIXMEs, both explicit and implied, including: - Creating a field for a capture of 'this' - Improved diagnostics for initialization failures when capturing variables by copy - Dealing with temporaries created during said initialization - Template instantiation - AST (de-)serialization - Binding and returning the lambda expression; turning it into a proper temporary - Lots and lots of semantic constraints - Parameter pack captures git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149977 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-05constexpr: Fix implementation of DR1311: check for volatile qualifiers inRichard Smith
lvalue-to-rvalue conversions on the source type of the conversion, not the target type (which has them removed for non-class types). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149796 91177308-0d34-0410-b5e6-96231b3b80d8
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