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path: root/lib/AST/ExprConstant.cpp
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2013-04-22C++1y constexpr extensions, round 1: Allow most forms of declaration andRichard Smith
statement in constexpr functions. Everything which doesn't require variable mutation is also allowed as an extension in C++11. 'void' becomes a literal type to support constexpr functions which return 'void'. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180022 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-22Fix array constant expression evaluation bug: we can have different values forRichard Smith
different array elements, even if they're all constructed using the same default constructor. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180017 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-20C++1y: Allow aggregates to have default initializers.Richard Smith
Add a CXXDefaultInitExpr, analogous to CXXDefaultArgExpr, and use it both in CXXCtorInitializers and in InitListExprs to represent a default initializer. There's an additional complication here: because the default initializer can refer to the initialized object via its 'this' pointer, we need to make sure that 'this' points to the right thing within the evaluation. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179958 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-16Basic support for Microsoft property declarations andJohn McCall
references thereto. Patch by Tong Shen! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179585 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-13Annotate flavor of TLS variable (statically or dynamically initialized) onto ↵Richard Smith
the AST. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179447 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-11Force a load when creating a reference to a temporary copied from a bitfield.Jordan Rose
For this source: const int &ref = someStruct.bitfield; We used to generate this AST: DeclStmt [...] `-VarDecl [...] ref 'const int &' `-MaterializeTemporaryExpr [...] 'const int' lvalue `-ImplicitCastExpr [...] 'const int' lvalue <NoOp> `-MemberExpr [...] 'int' lvalue bitfield .bitfield [...] `-DeclRefExpr [...] 'struct X' lvalue ParmVar [...] 'someStruct' 'struct X' Notice the lvalue inside the MaterializeTemporaryExpr, which is very confusing (and caused an assertion to fire in the analyzer - PR15694). We now generate this: DeclStmt [...] `-VarDecl [...] ref 'const int &' `-MaterializeTemporaryExpr [...] 'const int' lvalue `-ImplicitCastExpr [...] 'int' <LValueToRValue> `-MemberExpr [...] 'int' lvalue bitfield .bitfield [...] `-DeclRefExpr [...] 'struct X' lvalue ParmVar [...] 'someStruct' 'struct X' Which makes a lot more sense. This allows us to remove code in both CodeGen and AST that hacked around this special case. The commit also makes Clang accept this (legal) C++11 code: int &&ref = std::move(someStruct).bitfield PR15694 / <rdar://problem/13600396> git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179250 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-29Fix a crash in OpenCL code by using the proper (RHS) bit-width.Joey Gouly
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173802 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-24removed duplicated comment.Fariborz Jahanian
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173378 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-24Patch to check for integer overflow. It has beenFariborz Jahanian
commented on and approved by Richard Smith. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173377 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-22Switch to APFloat constructor taking fltSemantics.Tim Northover
This change also makes the serialisation store the required semantics, fixing an issue where PPC128 was always assumed when re-reading a 128-bit value. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173139 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-20Implement OpenCL event_t as Clang builtin type, including event_t related ↵Guy Benyei
OpenCL restrictions (OpenCL 1.2 spec 6.9) git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172973 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-12Remove useless 'llvm::' qualifier from names like StringRef and others that areDmitri Gribenko
brought into 'clang' namespace by clang/Basic/LLVM.h git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172323 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-09Issue warning when case value is too large to fitFariborz Jahanian
in case condition type. // rdar://11577384. Test is conditionalized on x86_64-apple triple as I am not sure if the INT_MAX/LONG_MAX values in the test will pass this test for other hosts. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172016 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-07Scalar shifts in the OpenCL specification (as of v. 1.2) are defined to beDavid Tweed
with respect to the lower "left-hand-side bitwidth" bits, even when negative); see OpenCL spec 6.3j. This patch both implements this behaviour in the code generator and "constant folding" bits of Sema, and also prevents tests to detect undefinedness in terms of the weaker C99 or C++ specifications from being applied. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171755 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-02s/CPlusPlus0x/CPlusPlus11/gRichard Smith
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171367 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-28Replace magic numbers in CheckICE with an enum.Richard Smith
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171192 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-28PR14729: Fix typo in CheckICE for BinaryConditionalOperators.Richard Smith
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171191 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-01Include pruning and general cleanup.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169095 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-17DR1535: only potentially-evaluated typeid expressions are disallowed in constantRichard Smith
expressions, not *any* typeid on a polymorphic class type. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166156 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-06Expose __builtin_bswap16.Benjamin Kramer
GCC has always supported this on PowerPC and 4.8 supports it on all platforms, so it's a good idea to expose it in clang too. LLVM supports this on all targets. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165362 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-03CodeGen: Fix a silly typo when emitting subs of block addresses.Benjamin Kramer
Part of PR14005. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165117 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-01Fix treatment of case which came up on std-proposals@: 'void' is permitted ↵Richard Smith
in core constant expressions, despite not being a literal type. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164968 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-28Allow __builtin_bswap32/64 in constant expressions, like gcc does. Patch by ↵Richard Smith
Tijl Coosemans! git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164841 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-12PR13811: Add a FunctionParmPackExpr node to handle references to functionRichard Smith
parameter packs where the reference is not being expanded but the pack has been. Previously, Clang would segfault in such cases. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163672 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-31Change the representation of builtin functions in the ASTEli Friedman
(__builtin_* etc.) so that it isn't possible to take their address. Specifically, introduce a new type to represent a reference to a builtin function, and a new cast kind to convert it to a function pointer in the operand of a call. Fixes PR13195. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162962 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-29Move TLS check from LValueExprEvaluator::VisitVarDecl toHans Wennborg
CheckLValueConstantExpression. Richard pointed out that using the address of a TLS variable is ok in a core C++11 constant expression, as long as it isn't part of the eventual result of constant expression evaluation. Having the check in CheckLValueConstantExpression accomplishes this. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162850 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-29Fix r162835 as per Richard's comments.Hans Wennborg
VisitVarDecl should return Error(E), and we should test that the address of a TLS var can't be used as a constexpr. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162837 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-29The address of a TLS var is not compile-time constant (PR13720)Hans Wennborg
This makes Clang produce an error for code such as: __thread int x; int *p = &x; The lvalue of a thread-local variable cannot be evaluated at compile time. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162835 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-23Change a bunch of cases where we do "getAs<...>->doSomething()" toTed Kremenek
"castAs<...>->doSomething()". The analyzer was flagging these as potential null dereferences, which is technically true. The invariants appear to be that these casts should never fail, so let's use castAs<> instead and avoid a runtime check. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162468 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-13Factor out computation of whether a typeid's expression is potentiallyRichard Smith
evaluated into a CXXTypeid member function. No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161779 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07Teach Expr::HasSideEffects about all the Expr types, and fix a bug where itRichard Smith
was mistakenly classifying dynamic_casts which might throw as having no side effects. Switch it from a visitor to a switch, so it is kept up-to-date as future Expr nodes are added. Move it from ExprConstant.cpp to Expr.cpp, since it's not really related to constant expression evaluation. Since we use HasSideEffect to determine whether to emit an unused global with internal linkage, this has the effect of suppressing emission of globals in some cases. I've left many of the Objective-C cases conservatively assuming that the expression has side-effects. I'll leave it to someone with better knowledge of Objective-C than mine to improve them. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161388 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-04objective-C string literal has no side-effect,Fariborz Jahanian
resulting in issuance of unused static variable warning now. // rdar://10777111 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161291 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-20Let Expr::HasSideEffects() return false for NULL, bool literals, this, and ↵Nico Weber
nullptr. Fixes PR13413, -Wunused-private-field now warns on unused fields initialized to NULL. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160541 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-17Don't treat overflow in floating-point conversions as a hard error in ↵Eli Friedman
constant evaluation. <rdar://problem/11874571>. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160394 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-13add support for conditional expressions in Expr::HasSideEffects()Nuno Lopes
This fixes a bug in __builtin_object_size() codegen git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160191 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-10Fix crash when constant-evaluating a CXXConstructExpr representingRichard Smith
value-initialization for an array of class type with a trivial default constructor. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160024 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-07PR13290: Constant-evaluation support for CXXConstructExprs which construct aRichard Smith
multidimensional array of class type. Also, preserve zero-initialization when evaluating an initializer list for an array, in case the initializers refer to later elements (which have preceding zero-initialization). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159904 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-26Remove typedef which is unused after r159189.Richard Smith
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159224 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-26Fix lifetime issue for backing APValue of OpaqueValueExpr in recursiveRichard Smith
constexpr function evaluation, and corresponding ASan / valgrind issue in tests, by storing the corresponding value with the relevant stack frame. This also prevents re-evaluation of the source of the underlying OpaqueValueExpr, which makes a major performance difference for certain contrived code (see testcase update). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159189 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-25Use std::map instead of llvm::DenseMap because we rely on the stability of ↵Eli Friedman
references to values in these maps. PR13197. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159161 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-06Revert Decl's iterators back to pointer value_type rather than reference ↵David Blaikie
value_type In addition, I've made the pointer and reference typedef 'void' rather than T* just so they can't get misused. I would've omitted them entirely but std::distance likes them to be there even if it doesn't use them. This rolls back r155808 and r155869. Review by Doug Gregor incorporating feedback from Chandler Carruth. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158104 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-23If the first argument of __builtin_object_size can be folded to a constantRichard Smith
pointer, but such folding encounters side-effects, ignore the side-effects rather than performing them at runtime: CodeGen generates wrong code for __builtin_object_size in that case. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157310 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-01My first effort to do this more subtly failed, so elaboratelyJohn McCall
test for an invalid declaration at every single place in the constant evaluator that's about to request a struct layout. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155868 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-30Remove the ref/value inconsistency in filter_decl_iterator.David Blaikie
filter_decl_iterator had a weird mismatch where both op* and op-> returned T* making it difficult to generalize this filtering behavior into a reusable library of any kind. This change errs on the side of value, making op-> return T* and op* return T&. (reviewed by Richard Smith) git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155808 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-26Fix a crash-on-invalid where the constant evaluator would try toJohn McCall
evaluate certain expressions involving invalidly-defined classes. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155645 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-19Implements boxed expressions for Objective-C. <rdar://problem/10194391>Patrick Beard
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155082 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-16Per Richard's comments on r154794, add the checks necessary to handle ↵Eli Friedman
constant-folding relational comparisons safely in case the user is using -fwrapv or equivalent. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154849 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-16Make constant evaluation for pointer comparisons work correctly for some ↵Eli Friedman
uncommon cases. <rdar://problem/10962435>. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154794 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-16The result of the Microsoft __uuidof operator must be considered a global ↵Francois Pichet
lvalue during constant expression evaluation. Otherwise we would get this error in C++11 mode (because of a recent change): error: non-type template argument of type 'const _GUID *' is not a constant expression For code like: template <const GUID* g = &__uuidof(struct_with_uuid)> class COM_CLASS { }; git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154790 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-15PR12226: don't generate wrong code if a braced string literal is used toRichard Smith
initialize an array of unsigned char. Outside C++11 mode, this bug was benign, and just resulted in us emitting a constant which was double the required length, padded with 0s. In C++11, it resulted in us generating an array whose first element was something like i8 ptrtoint ([n x i8]* @str to i8). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154756 91177308-0d34-0410-b5e6-96231b3b80d8
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