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expression. Implement C++11 [expr.prim.lambda]p12's requirement that
capturing a variable will odr-use it.
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per C++ [expr.prim.lambda]p6.
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list; it is not an expression.
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semantics.
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[expr.prim.lambda]p4, including the current suggested resolution of
core isue 975, which allows multiple return statements so long as the
types match. ExtWarn when user code is actually making use of this
extension.
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and rapidly becoming untrue.
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[expr.prim.lambda].
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unevaluated operands. Be certain that we're marking everything
referenced within a capture initializer as odr-used.
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capture, make sure we actually add the field.
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- Complete the lambda class when we finish the lambda expression
(previously, it was left in the "being completed" state)
- Actually return the LambdaExpr object and bind to the resulting
temporary when needed.
- Detect when cleanups are needed while capturing a variable into a
lambda (e.g., due to default arguments in the copy constructor), and
make sure those cleanups apply for the whole of the lambda
expression.
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only add 'const' for variables captured by copy in potentially
evaluated expressions of non-mutable lambdas. (The "by copy" part was
missing).
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body of the lambda to the function call operator.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150087 91177308-0d34-0410-b5e6-96231b3b80d8
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- 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
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Still left: explicit captures in lambdas need to cause implicit capture, and I need to take a look at the diagnostics for some cases.
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- Actually building the var -> capture mapping properly (there was an off-by-one error)
- Keeping track of the source location of each capture
- Minor QoI improvements, e.g, highlighing the prior capture if
there are multiple captures, pointing at the variable declaration we
found if we reject it.
As part of this, add standard citations for the various semantic
checks we perform, and note where we're not performing those checks as
we should.
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and less error-prone way of handling the relevant cases. Towards marking of whether a declaration is used more accurately.
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referencing a class field from outside an instance method.
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Split out a new ExpressionEvaluationContext flag for this case, and don't treat
it as unevaluated in C++11. This fixes some crash-on-invalids where we would
allow references to class members in potentially-evaluated constant expressions
in static member functions, and also fixes half of PR10177.
The fix to PR10177 exposed a case where template instantiation failed to provide
a source location for a diagnostic, so TreeTransform has been tweaked to supply
source locations when transforming a type. The source location is still not very
good, but MarkDeclarationsReferencedInType would need to operate on a TypeLoc to
improve it further.
Also fix MarkDeclarationReferenced in C++98 mode to trigger instantiation for
static data members of class templates which are used in constant expressions.
This fixes a link-time problem, but we still incorrectly treat the member as
non-constant. The rest of the fix for that issue is blocked on PCH support for
early-instantiated static data members, which will be added in a subsequent
patch.
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-std=c++0x. Patch by Ahmed Charles!
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141900 91177308-0d34-0410-b5e6-96231b3b80d8
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