1) Check if a dead store appears as a subexpression.  For such cases, we emit
   a verbose diagnostic so that users aren't confused.  This addresses:
   
   <rdar://problem/5968508> checker gives misleading report for dead store in loop
   
2) Don't emit a dead store warning when assigning a null value to a pointer.
   This is a common form of defensive programming.  We may wish to make
   this an option to the the checker one day.
   
   This addresses the feature request in the following email:
   
   http://lists.cs.uiuc.edu/pipermail/cfe-dev/2008-June/001978.html

llvm-svn: 52555

Added a new ProgramPoint: PostPurgeDeadSymbols.  This new program point distinguishes between the cases when we just evaluated the transfer function of a Stmt* (PostStmt) or performed a load (PostLoad).  This solves a caching bug observed in a recent bug report.

llvm-svn: 52443

EvalStore/EvalLoad to handle all loads/stores from symbolic memory, allowing us
to do checks for null dereferences, etc., at any arbitrary load/store (these
were missed checks before). This also resulted in some major cleanups, some
conceptual, and others just in the structure of the code.

This temporarily introduces a regression in the test suite (null-deref-ps.c)
before I add a new LVal type for structure fields.

llvm-svn: 50443

compiler warning introduced by a recent patch of mine.

llvm-svn: 49917

llvm-svn: 49907

a node, not the state of the predecessor.

llvm-svn: 49823

evaluating transfer functions at the end-of-path.

llvm-svn: 49561

lib dir and move all the libraries into it.  This follows the main
llvm tree, and allows the libraries to be built in parallel.  The
top level now enforces that all the libs are built before Driver,
but we don't care what order the libs are built in.  This speeds
up parallel builds, particularly incremental ones.

llvm-svn: 48402

llvm-svn: 48127

llvm-svn: 47955

"Refinement" of hack to bound loop-traversals: visit any block at a maximum of 3 times along a given path.

llvm-svn: 47766

from switch...case...default statements.

llvm-svn: 47100

http://llvm.org/viewvc/llvm-project?rev=47070&view=rev

llvm-svn: 47071

Renamed class GRConstants => GRExprEngine.

This was done with a Perl script, and will result in 80 col. violations that
I will gradually fix up.

llvm-svn: 47070

llvm-svn: 47068

llvm-svn: 47064

llvm-svn: 47038

llvm-svn: 47034

have been visited in a path.  Added GRBlockCounter as an item to be
enqueued to the worklist.

Modified "ProcessBranch" in GRConstants to prune branches with symbolic
conditions that have been already taken.

llvm-svn: 47010

__builtin_choose.

llvm-svn: 46731

worklist until the dstor of GRBranchNodeBuilderImpl. This way clients can mark
creates nodes as "sinks" before they are added to the worklist.

llvm-svn: 46582

constant integers.

llvm-svn: 46581

we automatically generate a new successor node along an edge if the checker
did not explicitly do so (i.e., we just propagate the current state).

llvm-svn: 46536

llvm-svn: 46532

llvm-svn: 46531

Refactoring: for GREngine and GRConstants, pushed references to CFG, ASTContext,
and the top-level FunctionDecl into ExplodedGraphImpl.

llvm-svn: 46475

handle the case where the number of nodes was 0.

Fixed bug in GREngineImpl where we did not proceed to the next statement
when processing a PostStmt location.

llvm-svn: 46093

Fixed some compilation errors with GREngine that showed up during
template instantiation.

llvm-svn: 46074

the end of the block by processing empty blocks (at BlockEntrance) or
when we have just processed the last statement in a block (at PostStmt).

llvm-svn: 45991

llvm-svn: 45986