that is in an anonymous namespace, give that function or variable
internal linkage.

This change models an oddity of the C++ standard, where names declared
in an anonymous namespace have external linkage but, because anonymous
namespace are really "uniquely-named" namespaces, the names cannot be
referenced from other translation units. That means that they have
external linkage for semantic analysis, but the only sensible
implementation for code generation is to give them internal
linkage. We now model this notion via the UniqueExternalLinkage
linkage type. There are several changes here:

  - Extended NamedDecl::getLinkage() to produce UniqueExternalLinkage
    when the declaration is in an anonymous namespace.
  - Added Type::getLinkage() to determine the linkage of a type, which
    is defined as the minimum linkage of the types (when we're dealing
    with a compound type that is not a struct/class/union).
  - Extended NamedDecl::getLinkage() to consider the linkage of the
    template arguments and template parameters of function template
    specializations and class template specializations.
  - Taught code generation to rely on NamedDecl::getLinkage() when
    determining the linkage of variables and functions, also
    considering the linkage of the types of those variables and
    functions (C++ only). Map UniqueExternalLinkage to internal
    linkage, taking out the explicit checks for
    isInAnonymousNamespace().

This fixes much of PR5792, which, as discovered by Anders Carlsson, is
actually the reason behind the pass-manager assertion that causes the
majority of clang-on-clang regression test failures. With this fix,
Clang-built-Clang+LLVM passes 88% of its regression tests (up from
67%). The specific numbers are:

LLVM:
  Expected Passes    : 4006
  Expected Failures  : 32
  Unsupported Tests  : 40
  Unexpected Failures: 736

Clang:
  Expected Passes    : 1903
  Expected Failures  : 14
  Unexpected Failures: 75

Overall:
  Expected Passes    : 5909
  Expected Failures  : 46
  Unsupported Tests  : 40
  Unexpected Failures: 811

Still to do:
  - Improve testing
  - Check whether we should allow the presence of types with
  InternalLinkage (in addition to UniqueExternalLinkage) given
  variables/functions internal linkage in C++, as mentioned in
  PR5792. 
  - Determine how expensive the getLinkage() calls are in practice;
  consider caching the result in NamedDecl.
  - Assess the feasibility of Chris's idea in comment #1 of PR5792.

llvm-svn: 95216

llvm-svn: 95215

llvm-svn: 95214

llvm-svn: 95213

llvm-svn: 95212

initializer. Grrr....

llvm-svn: 95211

llvm-svn: 95209

llvm-svn: 95208

so that llvm-mc -show-encoding prints like this:

	hlt                                                 ## encoding: [0xf4]

instead of like this:

	hlt
                     # encoding: [0xf4]

llvm-svn: 95207

instead of textually.

llvm-svn: 95206

of const ones.  non-const ones aren't very useful, because you can't
even, say, emit them.

llvm-svn: 95205

llvm-svn: 95203

add -filetype=null for performance testing and remove -filetype=dynlib,
which isn't planned to be implemented.

llvm-svn: 95202

llvm-svn: 95201

RegionStoreManager::InvalidateRegions() by adjusting the worklist to
iterate over BindingKeys instead of MemRegions.  We also only need to
do the actual invalidation work on base regions, and for non-base
regions just blow away their bindings.

llvm-svn: 95200

Implement Doug's suggestion. Eliminate the Stmts pointer from CXXTryStmt and instead allocate the statements after the object.

llvm-svn: 95199

llvm-svn: 95198

instructions on a single line.  Also made it a
bit more forgiving when it reports errors.

llvm-svn: 95197

as undefined.  Fixes an assertion in APFloat::toString noticed by Dale.

llvm-svn: 95196

Allow all types of callee's to be tail called. But avoid automatic tailcall if the callee is a result of bitcast to avoid losing necessary zext / sext etc.

llvm-svn: 95195

 - Requires backend support, which only exists for i386--darwin currently.

No 'as' required:
--
ddunbar@ozzy:tmp$ cat t.c
int main() { return 42; }
ddunbar@ozzy:tmp$ clang -m32 -integrated-as t.c


ddunbar@ozzy:tmp$ ./a.out; echo $?
42
ddunbar@ozzy:tmp$
--

The random extra whitespace is how you know its working! :)

llvm-svn: 95194

not build a subregion map and instead do a single scan of the store.
This is done by building "region clusters" that represent the
collection of regions that have the same base region.  Invalidating
any region in a cluster means that they all should get invalidated.

This change brought out a point that Zhongxing mentioned to me
offline: the flattened memory binding has issues distinguishing
between direct and default bindings.  For example, setting the default
value for an entire struct is the same as binding to the first
element.  To address this problem, I moved the binding "tag" (Direct
or Default) from BindingVal to BdingKey (and removed BindingVal
entirely).  This requires us to do double lookups in some cases; and
there is still much more cleanup that can be done.

This change produced a noticeable speedup when analyzing sqlite3 (a
reduction of 4% in running time).

llvm-svn: 95193

realize that CXXConstructExpr is always implicit, so we should just
return its argument (if there is only one) rather than directly
invoking the constructor.

llvm-svn: 95192

llvm-svn: 95191

llvm-svn: 95190

- Don't use GlobalAliases with non-0 GEPs (GNU runtime) - this was unsupported and LLVM will be generating errors if you do it soon.  This also simplifies the code generated by the GNU runtime a bit.  

- Make GetSelector() return a constant (GNU runtime), not a load of a store of a constant.

- Recognise @selector() expressions as valid static initialisers (as GCC does).

- Add methods to GCObjCRuntime to emit selectors as constants (needed for using @selector() expressions as constants.  These need implementing for the Mac runtimes - I couldn't figure out how to do this, they seem to require a load.

- Store an ObjCMethodDecl in an ObjCSelectorExpr so that we can get at the type information for the selector.  This is needed for generating typed selectors from @selector() expressions (as GCC does).  Ideally, this information should be stored in the Selector, but that would be an invasive change.  We should eventually add checks for common uses of @selector() expressions.  Possibly adding an attribute that can be applied to method args providing the types of a selector so, for example, you'd do something like this:

- (id)performSelector: __attribute__((selector_types(id, SEL, id)))(SEL)
           withObject: (id)object;

Then, any @selector() expressions passed to the method will be check to ensure that it conforms to this signature.  We do this at run time on the GNU runtime already, but it would be nice to do it at compile time on all runtimes.

- Made @selector() expressions emit type info if available and the runtime supports it.

Someone more familiar with the Mac runtime needs to implement the GetConstantSelector() function in CGObjCMac.  This currently just assert()s.

llvm-svn: 95189

llvm-svn: 95188

.o files don't like that.

llvm-svn: 95187

llvm-svn: 95186

llvm-svn: 95185

llvm-svn: 95184

llvm-svn: 95183

llvm-svn: 95182

llvm-svn: 95181

llvm-svn: 95180

the streamer.  Demo:

$ cat t.ll 
define i32 @test() nounwind {
  ret i32 42
}
$ llc t.ll -o -
...
_test: 
	movl	$42, %eax
	ret
$ llc t.ll -o t.o -filetype=obj
$ otool -tv t.o 
t.o:
(__TEXT,__text) section
_test:
00000000	movl	$0x0000002a,%eax
00000005	ret

llvm-svn: 95179

the end of the instruction instead of expecting the caller to
do it.  This currently causes the asm-verbose instruction 
comments to be on the next line.

llvm-svn: 95178

than DEBUG_VALUE :(  ) into the target indep AsmPrinter.cpp
file.   This allows elimination of the 
NO_ASM_WRITER_BOILERPLATE hack among other things.

llvm-svn: 95177

appropriately.  Call out a few missing cases in the expression mangler.

llvm-svn: 95176

llvm-svn: 95175