"manager of symbolic values", wrapping BasicValueFactory, SymbolManager, and
MemRegionManager. While these individual managers nicely separate functionality
in the analyzer, constructing symbolic values can sometimes be cumbersome
because it requires using multiple managers at once. The goal of this class is
to create some factory methods to create SVals that require the use of these
different managers, thus (hopefully) simplifying the analyzer API for clients.
llvm-svn: 68709
instead of a FullSourceLoc. This resulted in a bunch of small edits in various
clients.
- Updated BugReporter to include an alternate PathDiagnostic generation
algorithm for PathDiagnosticClients desiring more control-flow pieces.
llvm-svn: 68193
Zhongxing and I discussed by email.
Main changes:
- Removed SymIntConstraintVal and SymIntConstraint
- Added SymExpr as a parent class to SymbolData, SymSymExpr, SymIntExpr
- Added nonloc::SymExprVal to wrap SymExpr
- SymbolRef is now just a typedef of 'const SymbolData*'
- Bunch of minor code cleanups in how some methods were invoked (no functionality change)
This changes are part of a long-term plan to have full symbolic expression
trees. This will be useful for lazily evaluating complicated expressions.
llvm-svn: 67731
PathDiagnosticControlFlowPiece to distinguish (in the class hierarchy) between
events and control-flow diagnostic pieces. Clients must now use these directly
when constructing PathDiagnosticPieces.
llvm-svn: 66310
- Store bindings using a MemRegion -> SVal binding instead of VarDecl -> SVal
binding. This mirrors some of the idea of RegionStore, but is far simpler and
not nearly as functional. This leads to some code simplification and
some potential for some minor precision hacks.
Along the way...
- constify the use of MemRegion* in a few places
- add operator<<(llvm::raw_ostream, const MemRegion*)
llvm-svn: 66163
SVal::getAsLocSymbol(). This simplifies the code and allows the retain/release
checker to (I believe) also correctly reason about location symbols wrapped in
SymbolicRegions.
Along the way I cleaned up SymbolRef a little, disallowing implicit casts to
'unsigned'.
llvm-svn: 65972
giving them rough classifications (normal types, never-canonical
types, always-dependent types, abstract type representations) and
making it far easier to make sure that we've hit all of the cases when
decoding types.
Switched some switch() statements on the type class over to using this
mechanism, and filtering out those things we don't care about. For
example, CodeGen should never see always-dependent or non-canonical
types, while debug info generation should never see always-dependent
types. More switch() statements on the type class need to be moved
over to using this approach, so that we'll get warnings when we add a
new type then fail to account for it somewhere in the compiler.
As part of this, some types have been renamed:
TypeOfExpr -> TypeOfExprType
FunctionTypeProto -> FunctionProtoType
FunctionTypeNoProto -> FunctionNoProtoType
There shouldn't be any functionality change...
llvm-svn: 65591
- For autorelease pool tracking, keep information about the stack of pools
separate from their contents. Also, keep track of the number of times an
autorelease pool will send the "release" message to an object when the pool is
destroyed.
- Update CFRefCount::Update to return a new state instead of a reference count
binding. This will allow us to implement more complicated semantics with
autorelease pools.
llvm-svn: 65384
Should clang have a config.h or should we use the config.h of llvm or using the preprocessor is OK? I did a quick fix here, but having a guideline on how to handle non portable function would be great (or ask ted to stop breaking the windows build :)).
llvm-svn: 65233
handle method names that contain 'new', 'copy', etc., but those words might be
the substring of larger words such as 'newsgroup' and 'photocopy' that do not
indicate the allocation of objects. This should address the issues discussed in
<rdar://problem/6552389>.
llvm-svn: 65224
transitions and then generate a subsequent node that removes the dead symbol
bindings. This should drastically improve caching in the simulation graph when
retain-counted objects are being tracked.
llvm-svn: 65082
- Fix some grammar.
- Fix a bug where a "reference count incremented" diagnostic would not be shown
if the previous typestate was "Released" (only happens in GC mode).
llvm-svn: 64971
retain/releases performed via [... release] and CFRetain(). The former are
no-ops in GC. The checker already handled this, but now we emit nice diagnostics
to the user telling them that these are no-ops.
llvm-svn: 64937
back to the summary used when evaluating the statement associated with a
simulation node. This is now being used to help improve the checker's
diagnostics. To get things started, the checker now emits a path diagnostic
indicating that 'autorelease' is a no-op in GC mode.
Some of these changes are exposing further grossness in the interface between
BugReporter and the ExplodedGraph::Trim facilities. These really need to be
cleaned up one day.
llvm-svn: 64881
symbols from an SVal.
- Fixed a bug in EnvironmentManager::RemoveDeadBindings() where it did not mark
live all the symbols reachable from a live block-level expression.
- Fixed a bug in the retain/release checker where it did not stop tracking
symbols that 'escaped' via compound literals being assigned to something the
BasicStoreManager didn't reason about.
llvm-svn: 64534
- Added a new 'node builder' class called GRStmtNodeBuilderRef (name may
change). This is essentially a smart reference to a GRStmtNodeBuilder object
that keeps track of the current context (predecessor node, GRExprEngine
object, etc.) The idea is to gradually simplify the interface between
GRExprEngine and GRTransferFuncs using this new builder (i.e., passing 1
argument instead of 5). It also handles some of the "auto-transition" for node
creation, simplifying some of the logic in GRExprEngine itself.
- Used GRStmtBuilderRef to replace GRTransferFuncs::EvalStore with
GRTransferFuncs::EvalBind. The new EvalBind method will be used at any
arbitrary places where a binding between a location and value takes place.
Moreover, GRTransferFuncs no longer has the responsibility to request
StoreManager to do the binding; this is now in GRExprEngine::EvalBind. All
GRTransferFuncs::EvalBind does is checker-specific logic (which can be a
no-op).
llvm-svn: 64525
- rename isObjCIdType/isObjCClassType -> isObjCIdStructType/isObjCClassStructType. The previous name didn't do what you would expect.
- add back isObjCIdType/isObjCClassType to do what you would expect. Not currently used, however many of the isObjCIdStructType/isObjCClassStructType clients could be converted over time.
- move static Sema function areComparableObjCInterfaces to ASTContext (renamed to areComparableObjCPointerTypes, since it now operates on pointer types).
llvm-svn: 64385
checker. This was previously needed because BugReport objects were previously
allocated on the stack and not owned by BugReporter. Now we can just issue them
on the fly. This change was motivated because we were seeing some weird cases
where some really long paths would get issued for bugs (particularly leaks)
because of some double-caching.
llvm-svn: 63840
the ownership of BugTypes and BugReports. Now BugReports are owned by BugTypes,
and BugTypes are owned by the BugReporter object.
The major functionality change in this patch is that reports are not immediately
emitted by a call to BugReporter::EmitWarning (now called EmitReport), but
instead of queued up in report "equivalence classes". When
BugReporter::FlushReports() is called, it emits one diagnostic per report
equivalence class. This provides a nice cleanup with the caching of reports as
well as enables the BugReporter engine to select the "best" path for reporting a
path-sensitive bug based on all the locations in the ExplodedGraph that the same
bug could occur.
Along with this patch, Leaks are now coalesced into a common equivalence class
by their allocation site, and the "summary" diagnostic for leaks now reports the
allocation site as the location of the bug (this may later be augmented to also
provide an example location where the leak occurs).
llvm-svn: 63796
- Refactor a bunch of logic in the retain/release checker, making it more
condense and easier to read.
- Add support for "Create" methods in the DiskArbitration framework
retain/release tests:
- Rename CFDate.m to retain-release.m, and move test from CFString.c to
retain-release.m
- Add DiskArbitration framework tests cases.
- Add/refine and few more retain/release GC test cases.
llvm-svn: 62106
recent discussions with Thomas Clement and Ken Ferry concerning the "fundamental
rule" for Cocoa memory management
(http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Tasks/MemoryManagementRules.html).
Here is the revised behavior of the checker concerning tracking retain/release
counts for objects returned from message expressions involving instance methods:
1) Track the returned object if the return type of the message expression is
id<..>, id, or a pointer to *any* object that subclasses NSObject. Such objects
are assumed to have a retain count. Previously the checker only tracked objects
when the receiver of the message expression was part of the standard Cocoa API
(i.e., had class names prefixed with 'NS'). This should significantly expand the
amount of checking performed.
2) Consider the object owned if the selector of the message expression contains
"alloc", "new", or "copy". Previously we also considered "create", but this
doesn't follow from the fundamental rule (discussions with the Cocoa folks
confirms this).
llvm-svn: 61837
- Because of the introduction of AnonTypedRegions when reasoning about casts, we
had a regression in the "symbolication" of variable values passed-by-reference
to a function. This is now fixed in CFRefCount.cpp (-checker-cfref) by
blasting through the layer of AnonTypedRegions when symbolicating the value of
the variable. This logic may get moved elsewhere. Note that this change
affects only -checker-cfref and not -checker-simple; eventually this logic
should get pulled out of CFRefCount.cpp into a more common place. All users
use -checker-cfref by default, and -checker-simple should probably just be
removed.
- Updated test 'Analysis/uninit-vals-ps.c' to only use -checker-cfref and added
a test case for this regression.
llvm-svn: 61147
- Overhauled the notion of "types" for TypedRegions. We now distinguish between the "lvalue" of a region (via getLValueRegion()) and the "rvalue" of a region (va getRValueRegion()). Since a region represents a chunk of memory it has both, but we were conflating these concepts in some cases, leading to some insidious bugs.
- Removed AnonPointeeType, partially because it is unused and because it doesn't have a clear notion of lvalue vs rvalue type. We can add it back once there is a need for it and we can resolve its role with these concepts.
StoreManager:
- Overhauled StoreManager::CastRegion. It expects an *lvalue* type for a region. This is actually what motivated the overhaul to the MemRegion type mechanism. It also no longer returns an SVal; we can just return a MemRegion*.
- BasicStoreManager::CastRegion now overlays an "AnonTypedRegion" for pointer-pointer casts. This matches with the MemRegion changes.
- Similar changes to RegionStore, except I've added a bunch of FIXMEs where it wasn't 100% clear where we should use TypedRegion::getRValueRegion() or TypedRegion::getLValueRegion().
AuditCFNumberCreate check:
- Now blasts through AnonTypedRegions that may layer the original memory region, thus checking if the actually memory block is of the appropriate type. This change was needed to work with the changes to StoreManager::CastRegion.
GRExprEngine::VisitCast:
- Conform to the new interface of StoreManager::CastRegion.
Tests:
- None of the analysis tests fail now for using the "basic store".
- Disabled the tests 'array-struct.c' and 'rdar-6442306-1.m' pending further testing and bug fixing.
llvm-svn: 60995
a new NamedDecl::getAsString() method.
Change uses of Selector::getName() to just pass in a Selector
where possible (e.g. to diagnostics) instead of going through
an std::string.
This also adds new formatters for objcinstance and objcclass
as described in the dox.
llvm-svn: 59933
etc more generic. For some targets, long may not be equal to pointer size. For
example: PIC16 has int as i16, ptr as i16 but long as i32.
Also fixed a few build warnings in assert() functions in CFRefCount.cpp,
CGDecl.cpp, SemaDeclCXX.cpp and ParseDeclCXX.cpp.
llvm-svn: 58501
- Added new region "SymbolicRegion", which maps symbol values to the region domain.
- Enhanced BasicStore::getFieldLValue() to return a FieldRegion (using SymbolicRegion)
- Added some utility methods to GRState for fetch svals from the store.
- Fixed regression in CheckNSError (we weren't getting the value bound to the parameter)
llvm-svn: 57717
This patch overhauls the "memory region" abstraction that was prototyped (but never really used) as part of the Store.h. This patch adds MemRegion.h and MemRegion.cpp, which defines the class MemRegion and its subclasses. This classes serve to define an abstract representation of memory, with regions being layered on other regions to to capture the relationships between fields and variables, variables and the address space they are allocated in, and so on.
The main motivation of this patch is that key parts of the analyzer assumed that all value bindings were to VarDecls. In the future this won't be the case, and this patch removes lval::DeclVal and replaces it with lval::MemRegionVal. Now all pieces of the analyzer must reason about abstract memory blocks instead of just variables.
There should be no functionality change from this patch, but it opens the door for significant improvements to the analyzer such as field-sensitivity and object-sensitivity, both which were on hold until the memory abstraction got generalized.
The memory region abstraction also allows type-information to literally be affixed to a memory region. This will allow the some now redundant logic to be removed from the retain/release checker.
llvm-svn: 57042
Use this updated interface when invalidating arguments passed by reference; the type of symbol is of the object passed by reference, not the reference itself.
llvm-svn: 56894
Changed casing of many bug names. The convention will be to have bug names (mostly) lower cased, and categories use some capitalization.
llvm-svn: 56385
- Change definition of store::Region and store::Binding (once again) to make
them real classes that just wrap pointers. This makes them more strictly
typed, and allows specific implementations of Regions/Bindings to just
subclass them.
- minor renamings to RegionExtent and its subclasses
- added a bunch of doxygen comments
StoreManager: (static analyzer)
- added 'iterBindings', an iteration method for iterating over the bindings of a
store. It that takes a callback object (acting like a poor man's closure).
- added 'getRVal' version for store::Binding. Will potentially phase the other
versions of GetRVal in StoreManager out.
- reimplemented 'getBindings' to be non-virtual and to use 'iterBindings'
BasicStoreManager: (static analyzer)
- implemented 'iterBindings' for BasicStoreManager
llvm-svn: 55688
Migrated CFRefCount.cpp to use getBindings and BindingsAsString instead of
making assumptions about the Store (removed dependence on GRState::vb_iterator).
llvm-svn: 55522
- Remove ConstNotEq from GRState/GRStateManager (!= tracking uses GDM instead).
- GRStateManager now can book-keep "contexts" (e.g., factory objects) for uses
with data elements stored into the GDM.
- Refactor pretty-printing of states to use GRState::Printer objects
exclusively. This removed a huge amount of pretty-printing logic from
GRExprEngine.
CFRefCount
- Simplified some API calls based on refinements to the GDM api.
llvm-svn: 54835
of using CheckerState).
Removed CheckerState from GRState.
Added class GRStateRef which wraps GRState* and GRStateManager*. This is handy
for generating new states with a single handle.
Added member template set/get functions to GRStateRef/GRState/GRStateManager for
accessing the Generic Data Map.
llvm-svn: 54788
- Drop {Decl.h,DeclObjC.h,IdentifierTable.h} from Expr.h
- Moved Sema::getCurMethodDecl() out of line (dependent on
ObjCMethodDecl via dyn_cast).
llvm-svn: 54629
current store implementation is now encapsulated by BasicStore.
These changes prompted some long due constification of ValueState. Much of the
diffs in this patch include adding "const" qualifiers.
llvm-svn: 53423
passed-by-reference to a function. This allows us to build up constraints for
their new values and restore some lost path-sensitivity. This addresses a few
false positives since in Adium.
llvm-svn: 53125
Tracked objects now have their type information tracked with them.
Enhanced summaries for ObjC methods to include the type information of the receiver.
Used the enhanced summaries to support the idiom that NSWindow owns itself (it sends a release message to itself upon close).
Added some comments.
Did some cleanups with the checker logic using operator overloading (reduced redundant code which I was concerned about being the source of bugs).
llvm-svn: 52741
clang as a Release build.
The big change is that all AST nodes (subclasses of Stmt) whose children are
Expr* store their children as Stmt* or arrays of Stmt*. This is to remove
strict-aliasing warnings when using StmtIterator. None of the interfaces of any
of the classes have changed (except those with arg_iterators, see below), as the
accessor methods introduce the needed casts (via cast<>). While this extra
casting may seem cumbersome, it actually adds some important sanity checks
throughout the codebase, as clients using StmtIterator can potentially overwrite
children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts
provide extra sanity checks that are operational in debug builds to catch
invariant violations such as these.
For classes that have arg_iterators (e.g., CallExpr), the definition of
arg_iterator has been replaced. Instead of it being Expr**, it is an actual
class (called ExprIterator) that wraps a Stmt**, and provides the necessary
operators for iteration. The nice thing about this class is that it also uses
cast<> to type-checking, which introduces extra sanity checks throughout the
codebase that are useful for debugging.
A few of the CodeGen functions that use arg_iterator (especially from
OverloadExpr) have been modified to take begin and end iterators instead of a
base Expr** and the number of arguments. This matches more with the abstraction
of iteration. This still needs to be cleaned up a little bit, as clients expect
that ExprIterator is a RandomAccessIterator (which we may or may not wish to
allow for efficiency of representation).
This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c,
which was already broken) on both a Debug and Release build, but it should
obviously be reviewed.
llvm-svn: 52378
tracked object to "escape": it's reference count might be incremented by the
called function, thus causing an object's lifetime to extend beyond when the
local reference count is decremented to 0.
This addresses: <rdar://problem/5933215>
llvm-svn: 51433
function that returns a CFxxxRef, not just functions whose name begins with
CF. This implements <rdar://problem/5917879>.
Added test case for this feature.
Updated calls to CStrInCStrNoCase to swap their arguments, per compatibility
with strcasestr.
llvm-svn: 50829
logic for function calls and message expressions.
Use the following heuristic to infer "allocating" instance methods:
[ClassName classWithXXX] allocates an object
Update testcase to reflect this heuristic.
llvm-svn: 50708
the object was last used. This can be confusing to users.
For example:
// 'y' is leaked
x = foo(y);
instead:
x = foo(y);
// 'y' is leaked
llvm-svn: 50661
Douglas Gregor