between forward and backward analyses, with trait classes being used
to implement the key differences in operations/functionality.
Converted the LiveVariables analysis to use the generic DataflowSolver. This,
along with removing some extra functionality that was not needed, reduced
the code for LiveVariables by over half.
Modified Driver code to handle the updated interface to LiveVariables.
Modified the DeadStores checker to handle the update interface to
LiveVariables.
Updated DataflowValues (generic ADT to store dataflow values) to also
store values for blocks. This is used by DeadStores. Updated some comments.
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is persistent. Adds/removals to a PersistentMap do not result in
a map being modified, but a new map being created. This will be useful
for path-sensitive analyses.
The current implementation mainly makes copies to implement this
functionality. If the map turns out to be extensively used, this
implementation will be replaced with a more efficient one that uses
data sharing (see comments in PersistentMap.h for more information).
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counted objects that maintain their own internal reference count.
This smart pointer implementation is compatible with LLVM-style
down-casting (see in llvm: include/llvm/Support/Casting.h).
Implemented "RefCounted", a base class that objects that wish to be
managed using IntrusiveSPtrs can subclass.
Reference counted objects are being targeted for use in path-sensitive
dataflow analyses where managing many live objects becomes difficult.
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integer constant expressions. The only questionable
thing is that we now reject:
void foo() {
switch (1) {
case (int)1.0e10000:
;
}
}
with:
t.c:5:13: error: case label does not reduce to an integer constant
case (int)1.0e10000:
~~~~~^~~~~~~~~
GCC accepts this, emitting the pedwarn:
t.c:5: warning: floating constant exceeds range of 'double'
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1. Handles saving and checking on protocols used in an @interface declaration
2. Checks and saves class's super class.
3. Adds semantic check to category declarations.
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"Visitors" is more general than "CFGVisitors", as we aren't just using
visitation useful for CFG analysis.
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1. Detect used of undeclared/forward declared super class.
2. Detect duplicate definition of a class.
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of parsing the GraphTraits templates if they don't need that functionality.
Defined nodes_iterator for GraphTraits<Stmt*> to be based on llvm::df_iterator.
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The extended functionality of these visitors is that they automatically visit all statements in
an AST (no explicit recursion is required from subclasses), and the for the latter, decls are visited
as well.
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Rationale:
We currently have a separate table to unique ObjC selectors. Since I don't need all the instance data in IdentifierInfo, I thought this would save space (and make more sense conceptually).
It turns out the cost of having duplicate entries for unary selectors (i.e. names without colons) outweighs the cost difference between the IdentifierInfo & SelectorInfo structures. Here is the data:
Two tables:
*** Selector/Identifier Stats:
# Selectors/Identifiers: 51635
Bytes allocated: 1999824
One table:
*** Identifier Table Stats:
# Identifiers: 49500
Bytes allocated: 1990316
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to specify how two dataflow values should be compared for equality. The default
is to use std::equal_to.
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invocation of the solver.
UninitializedValues checker now uses CFG::runOnAllBlocks to query the
computed dataflow values (tighter code).
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of visiting all block-level statements in a CFG.
Tightened implementation of UninitializedValues.
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with CFG *edges* instead of blocks. This will fascilitate dataflow
analyses that are sensitive to block terminators, and also simplifies
some reasoning.
Updated UninitializedValues to comply to this new interface.
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Ted Kremenek
Hartmut Kaiser
Chris Lattner
Fariborz Jahanian
Steve Naroff
Gabor Greif