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1022 Commits

Author SHA1 Message Date
David Majnemer 846c2833ec CodeGen: Reference temporaries inherit visibility 
Reference temporaries inherited many properties from the variable that
they correspond to but visibility wasn't one of them.

llvm-svn: 207496
 2014-04-29 06:18:53 +00:00
David Majnemer 27d69dbbd0 CodeGen: Fix linkage of reference temporaries 
Summary:
A reference temporary should inherit the linkage of the variable it
initializes.  Otherwise, we may hit cases where a reference temporary
wouldn't have the same value in all translation units.

Reviewers: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D3515

llvm-svn: 207451
 2014-04-28 22:17:59 +00:00
David Majnemer 01bbd1b1c3 CodeGen: Cleanup variable linkage calculation 
Almost all linkage calculation for VarDecls occured inside of
GetLLVMLinkageVarDefinition except for static data members.  Centralize
the logic so that it can be more readily reused.

No functionality change.

llvm-svn: 207241
 2014-04-25 17:08:41 +00:00
David Majnemer f6acb76cb6 CodeGen: Refactor linkage/visibility calculation 
It turns out that linkage and visibility have rather similar logic for
both functions and non-variable globals.  Split the calculation out so
that both sides may share this code.

No functionality change.

llvm-svn: 207239
 2014-04-25 17:07:16 +00:00
Alp Toker 5f072d814f Remove some empty statements 
Cleanup only.

llvm-svn: 206709
 2014-04-19 23:55:49 +00:00
Justin Bogner 837a6f6f79 CodeGen: Use LLVM's InstrProfReader in -fprofile-instr-use= 
Update clang to use the InstrProfReader from LLVM to read
instrumentation based profile data. This also switches us from the
naive text format to the binary format, since that's what's
implemented in the reader.

llvm-svn: 206658
 2014-04-18 21:52:00 +00:00
Justin Bogner e2ef2a09ef CodeGen: Emit warnings for out of date profile data during PGO 
This adds a warning that triggers when profile data doesn't match for
the source that's being compiled with -fprofile-instr-use=. This fires
only once per translation unit, as warning on every mismatched
function would be quite noisy.

llvm-svn: 206322
 2014-04-15 21:22:35 +00:00
Justin Bogner f2ea775ed9 CodeGen: Move PGO initialization into Release() 
Emitting the PGO initialization in EmitGlobalFunctionDefinition is
inefficient, since this only has an effect once per module.  We move
this to Release() with the rest of the once-per-module logic.

llvm-svn: 205977
 2014-04-10 18:13:13 +00:00
David Majnemer 9832a3d1e0 CodeGen: Clean up CommonLinkage calculation 
No functionality change.

llvm-svn: 205972
 2014-04-10 16:53:16 +00:00
David Majnemer 54e3ba5ace CodeGen: Emit some functions as weak_odr under -fms-compatibility 
Summary:
MSVC always emits inline functions marked with the extern storage class
specifier.  The result is something similar to the opposite of
__attribute__((gnu_inline)).

This extension is also available in C.

This fixes PR19264.

Reviewers: rnk, rsmith

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D3207

llvm-svn: 205485
 2014-04-02 23:17:29 +00:00
Bob Wilson fc6297f314 Disable this-return optimizations when targeting iOS 5 and earlier. 
Clang implements the part of the ARM ABI saying that certain functions
(e.g., constructors and destructors) return "this", but Apple's version of
gcc and llvm-gcc did not. The libstdc++ dylib on iOS 5 was built with
llvm-gcc, which means that clang cannot safely assume that code from the C++
runtime will correctly follow the ABI. It is also possible to run into this
problem when linking with other libraries built with gcc or llvm-gcc. Even
though there is no way to reliably detect that situation, it is most likely
to come up when targeting older versions of iOS. Disabling the optimization
for any code targeting iOS 5 solves the libstdc++ problem and has a reasonably
good chance of fixing the issue for other older libraries as well.
<rdar://problem/16377159>

llvm-svn: 205272
 2014-04-01 01:38:16 +00:00
Paul Robinson f067435026 Implement the 'optnone' attribute, which suppresses most optimizations 
on a function.

llvm-svn: 205255
 2014-03-31 22:29:15 +00:00
Tim Northover a2ee433c8d ARM64: initial clang support commit. 
This adds Clang support for the ARM64 backend. There are definitely
still some rough edges, so please bring up any issues you see with
this patch.

As with the LLVM commit though, we think it'll be more useful for
merging with AArch64 from within the tree.

llvm-svn: 205100
 2014-03-29 15:09:45 +00:00
David Majnemer af3698066a CodeGen: Don't crash when replacing functions 
The peculiarities of C99 create scenario where an LLVM IR function
declaration may need to be replaced with a definition baring a different
type because the prototype and definition are not required to agree.

However, we were not properly deferring this when it occurred.

This fixes PR19280.

llvm-svn: 205099
 2014-03-29 14:19:55 +00:00
Rafael Espindola a39fc6dd2a Handle and warn on aliases to weak aliases. 
This produces valid IR now that llvm rejects aliases to weak aliases and warns
the user that the resolution is not changed if the weak alias is overridden.

llvm-svn: 204935
 2014-03-27 15:27:20 +00:00
Rafael Espindola 2f8d0104b0 Revert "Update for llvm api change." 
This reverts commit r204783.

llvm-svn: 204785
 2014-03-26 06:14:54 +00:00
Rafael Espindola 02633f63eb Update for llvm api change. 
llvm-svn: 204783
 2014-03-26 05:34:18 +00:00
David Majnemer 58e5bee17a MS ABI: Eliminate Duplicate Strings 
COFF doesn't have mergeable sections so LLVM/clang's normal tactics for
string deduplication will not have any effect.

To remedy this we place each string inside it's own section and mark
the section as IMAGE_COMDAT_SELECT_ANY.  However, we can only do this if the
string has an external name that we can generate from it's contents.

To be compatible with MSVC, we must use their scheme.  Otherwise identical
strings in translation units from clang may not be deduplicated with
translation units in MSVC.

This fixes PR18248.

N.B. We will not attempt to do anything with a string literal which is not of
type 'char' or 'wchar_t' because their compiler does not support unicode
string literals as of this date.  Further, we avoid doing this if
either -fwritable-strings or -fsanitize=address are present.

This reverts commit r204596.

llvm-svn: 204675
 2014-03-24 21:43:36 +00:00
Timur Iskhodzhanov 89f588ff73 Revert r204562,204566,204586,204587 as they broke ASan on Windows 
llvm-svn: 204596
 2014-03-24 10:31:09 +00:00
David Majnemer 96bc4b0367 MS ABI: Add tests, other cleanups for r204562 
This commit cleans up a few accidents:
- Do not rely on the order in which StringLiteral lays out bytes.
- Use a more efficient mechanism for handling so-called
  "special-mappings" when mangling string literals.
- There is no need to allocate a copy of the mangled name.
- Add the test written for r204562.

Thanks to Richard Smith for pointing these out!

llvm-svn: 204586
 2014-03-24 05:53:08 +00:00
David Majnemer 3843a05edf MS ABI: Eliminate Duplicate Strings 
COFF doesn't have mergeable sections so LLVM/clang's normal tactics for
string deduplication will not have any effect.

To remedy this we place each string inside it's own section and mark
the section as IMAGE_COMDAT_SELECT_ANY.  However, we can only do this if the
string has an external name that we can generate from it's contents.

To be compatible with MSVC, we must use their scheme.  Otherwise identical
strings in translation units from clang may not be deduplicated with
translation units in MSVC.

This fixes PR18248.

N.B. We will not attempt to do anything with a string literal which is not of
type 'char' or 'wchar_t' because their compiler does not support unicode
string literals as of this date.

llvm-svn: 204562
 2014-03-23 17:47:16 +00:00
Aaron Ballman d85eff49a3 [C++11] Replacing ObjCCategoryDecl iterators propimpl_begin() and propimpl_end() with iterator_range property_impls(). Updating all of the usages of the iterators with range-based for loops. 
llvm-svn: 203930
 2014-03-14 15:02:45 +00:00
Aaron Ballman aff18c0446 [C++11] Replacing ObjCContainerDecl iterators meth_begin() and meth_end() with iterator_range methods(). Updating all of the usages of the iterators with range-based for loops. 
llvm-svn: 203832
 2014-03-13 19:03:34 +00:00
Rafael Espindola 93c7a6532e Simplify code. No functionality change. 
llvm-svn: 203804
 2014-03-13 15:47:50 +00:00
Justin Bogner d66a17d0a3 Revert "CodeGen: Use a binary format for instrumentation based profiling" 
I've clearly done something wrong with how to get this to link
correctly. Reverting for now.

This reverts commit r203711.

llvm-svn: 203712
 2014-03-12 21:06:31 +00:00
Justin Bogner ff9a058267 CodeGen: Use a binary format for instrumentation based profiling 
This updates CodeGenPGO to use the ProfileDataReader introduced to
llvm in r203703 and the new API for writing out the profile introduced
to compiler-rt in r203710.

llvm-svn: 203711
 2014-03-12 20:53:16 +00:00
Aaron Ballman be22bcb180 [C++11] Replacing DeclBase iterators specific_attr_begin() and specific_attr_end() with iterator_range specific_attrs(). Updating all of the usages of the iterators with range-based for loops. 
llvm-svn: 203474
 2014-03-10 17:08:28 +00:00
Chandler Carruth 4d01fff492 [C++11] Update Clang for the change to LLVM's Use-Def chain iterators in 
r203364: what was use_iterator is now user_iterator, and there is
a use_iterator for directly iterating over the uses.

This also switches to use the range-based APIs where appropriate.

llvm-svn: 203365
 2014-03-09 03:16:50 +00:00
Aaron Ballman 629afaefe0 [C++11] Replacing DeclBase iterators decls_begin() and decls_end() with iterator_range decls(). The same is true for the noload versions of these APIs. Updating all of the usages of the iterators with range-based for loops. 
llvm-svn: 203278
 2014-03-07 19:56:05 +00:00
Rafael Espindola 060062a433 Use llvm.compiler.used instead of llvm.used for objc symbols. 
LLVM currently has a hack (shouldEmitUsedDirectiveFor) that causes it to not
print no_dead_strip for symbols starting with 'l' or 'L'. These are exactly the
ones that the clang's objc codegen is producing. The net result, is that it is
equivalent to llvm.compiler.used.

The need for putting the private symbol in llvm.compiler.used should be clear
(the objc runtime uses them). The reason for also putting the weak symbols in
it is for LTO: ld64 will not ask us to preserve the it.

llvm-svn: 203172
 2014-03-06 22:15:10 +00:00
Chandler Carruth c80ceea90b [Modules] Update to reflect the move of CallSite into the IR library in 
LLVM r202816.

llvm-svn: 202817
 2014-03-04 11:02:08 +00:00
David Blaikie 0e716b42f4 DebugInfo: Emit only the declaration of a class template that has an explicit instantiation declaration (& always emit such a type when there's an explicit instantiation definition) 
We should only have this optimization fire when the explicit
instantiation definition would cause at  least one member function to be
emitted, thus ensuring that even a compiler not performing this
optimization would still emit the full type information elsewhere.

But we should also pessimize output still by always emitting the
definition when the explicit instantiation definition appears so that at
some point in the future we can depend on that information even when no
code had to be emitted in that TU. (this shouldn't happen very often,
since people mostly use explicit spec decl/defs to reduce code size -
but perhaps one day they could use it to explicitly reduce debug info
size too)

This was worth about 2% for Clang and LLVM - so not a huge win, but a
win. It looks really great for simple STL programs (include <string> and
just declare a string - 14k -> 1.4k of .dwo)

llvm-svn: 202769
 2014-03-03 23:48:23 +00:00
David Majnemer 67e541e1c8 Attr: Remove ForceInline 
The __forceinline keyword's semantics are now recast as AlwaysInline and
the kw___forceinline token has its language mode set for KEYMS.

This preserves the semantics of the previous implementation but with
less duplication of code.

llvm-svn: 202131
 2014-02-25 09:53:29 +00:00
Aaron Ballman 7c19ab17c7 Exposing the noduplicate attribute within Clang, which marks functions so that the optimizer does not duplicate code. 
Patch thanks to Marcello Maggioni!

llvm-svn: 201941
 2014-02-22 16:59:24 +00:00
David Blaikie 3e65d36a8b DebugInfo: imported_decl/using declarations at namespace scope 
llvm-svn: 201470
 2014-02-15 21:03:07 +00:00
Robert Lytton 15abd1881f XCore target: add section information. 
Xcore target ABI requires const data that is externally visible
to be handled differently if it has C-language linkage rather than
C++ language linkage.

llvm-svn: 201142
 2014-02-11 10:34:51 +00:00
Josh Magee e0fc1a80cb [stackprotector] Add command line option -fstack-protector-strong 
This option has the following effects:
 * It adds the sspstrong IR attribute to each function within the CU.
 * It defines the macro __SSP_STRONG__ with the value of 2.

Differential Revision: http://llvm-reviews.chandlerc.com/D2717

llvm-svn: 201120
 2014-02-11 01:35:14 +00:00
John McCall 8f80a61914 Remove the -fhidden-weak-vtables -cc1 option. It was dead, 
gross, and increasingly replaced through other mechanisms.

llvm-svn: 201011
 2014-02-08 00:41:16 +00:00
Reid Kleckner b78257d0c1 [ms-cxxabi] Fix cast when structor replacement is an alias 
llvm-svn: 200711
 2014-02-03 18:54:51 +00:00
Alp Toker 29cb66ba2f Enforce safe usage of DiagnosticsEngine::getCustomDiagID() 
Replace the last incorrect uses and templatize the function to require a
compile-time constant string preventing further misuse.

The diagnostic formatter expects well-formed input and has undefined behaviour
with arbitrary input or crafted user strings in source files. Accepting user
input would also have caused unbounded generation of new diagnostic IDs which
can be problematic in long-running sessions or language bindings.

This completes the work to fix several incorrect callers that passed user
input or raw messages to the diagnostics engine where a constant format string
was expected.

llvm-svn: 200132
 2014-01-26 06:17:37 +00:00
Rafael Espindola e1bd71fea4 Use private linkage for utf-16 objc strings too. 
llvm-svn: 199709
 2014-01-21 02:57:56 +00:00
Rafael Espindola 6839d23be7 Now that r199688 avoids the real issue, use private linkage for objc strings. 
llvm-svn: 199705
 2014-01-21 01:50:12 +00:00
Rafael Espindola d19f80a0b4 Give explicit sections for string constants used in NSStrings. 
Without them they can be merged with non unnamed_addr constants during LTO.
The resulting constant is not unnamed_addr and goes in a different section,
which causes ld64 to crash.

A testcase that would crash before:

* file1.mm:
void g(id notification) {
  [notification valueForKey:@"name"];
}

* file2.cpp:
extern const char js_name_str[] = "name";

* file3.cpp
extern bool JS_GetProperty(const char *name);
extern const char js_name_str[];
bool js_ReportUncaughtException() { JS_GetProperty(js_name_str); }

run

clang file1.mm  -o file1.o -c -w -emit-llvm
clang file2.cpp -o file2.o -c -w -emit-llvm
clang file3.cpp -o file3.o -c -w

ld -dylib -o XUL file1.o file2.o file3.o -undefined dynamic_lookup.

llvm-svn: 199688
 2014-01-20 20:33:18 +00:00
Rafael Espindola 8ff1610f06 Simplify further. 
Thanks to David Blaikie for the push.

llvm-svn: 199685
 2014-01-20 20:13:11 +00:00
Rafael Espindola 63582d605e Remove virtual methods that were added in 2009 and still had 1 implementation. 
llvm-svn: 199665
 2014-01-20 15:19:43 +00:00
Nico Rieck bb0554f959 Update CodeGen to use DLL storage class for dllimport/dllexport 
With the old linkage types removed, set the linkage to external for both
dllimport and dllexport to reflect what's currently supported.

llvm-svn: 199220
 2014-01-14 15:23:53 +00:00
Rafael Espindola b098f5c7b8 Remove unused include. 
llvm-svn: 198692
 2014-01-07 15:11:31 +00:00
Chandler Carruth 5553d0d4ca Sort all the #include lines with LLVM's utils/sort_includes.py which 
encodes the canonical rules for LLVM's style. I noticed this had drifted
quite a bit when cleaning up LLVM, so wanted to clean up Clang as well.

llvm-svn: 198686
 2014-01-07 11:51:46 +00:00
Justin Bogner ef512b9929 CodeGen: Initial instrumentation based PGO implementation 
llvm-svn: 198640
 2014-01-06 22:27:43 +00:00
Alp Toker 82862258e3 Tidy up CGCXXABI creation 
'create' functions conventionally return a pointer, not a reference.

Also use an OwningPtr to get replace the delete of a reference member.

No functional change.

llvm-svn: 198126
 2013-12-28 21:58:40 +00:00
Aaron Ballman c4327996ca Switched code from using hasAttr followed by getAttr to simply call getAttr directly and check the resulting value. 
No functional changes intended.

llvm-svn: 197652
 2013-12-19 03:09:10 +00:00
Aaron Ballman 9ead1243a5 Replacing calls to getAttr with calls to hasAttr for clarity. No functional change intended -- this only replaces Boolean uses of getAttr. 
llvm-svn: 197648
 2013-12-19 02:39:40 +00:00
Alp Toker 2dea15b53c ASTContext: Refactor implicit record creation 
Tidy up built-in record creation to reduce code duplication.

Continuation of r197336.

llvm-svn: 197452
 2013-12-17 01:22:38 +00:00
Reid Kleckner a12cd28bb3 [ms-cxxabi] Fix linkage of dtor thunks for anonymous classes 
We were mistakengly giving linkonce_odr linkage instead of internal
linkage to the deleting and complete destructor thunks for classes in
anonymous namespaces.

Fixes PR17273.

llvm-svn: 197060
 2013-12-11 19:21:27 +00:00
Rafael Espindola cd7743b5d1 Save another call to GetAddrOfFunction. 
Thread an optional GV down to EmitGlobalFunctionDefinition so that it can
avoid the lookup when we already know the corresponding llvm global value.

llvm-svn: 196789
 2013-12-09 16:01:03 +00:00
Rafael Espindola c0ff7448d7 When we decide to output a deferred decl, remember the llvm GlobalValue. 
We can reuse it to avoid a DenseMap+StringMap lookup to find if it was already
emitted or not.

This fixes a 2010 TODO.

llvm-svn: 196785
 2013-12-09 14:59:08 +00:00
Rafael Espindola 94abb8ffed Avoid adding some decls to DeferredDeclsToEmit. 
Before this patch GetOrCreateLLVMFunction would add a decl to
DeferredDeclsToEmit even when it was being called by the function trying to
emit that decl.

llvm-svn: 196753
 2013-12-09 04:29:47 +00:00
Rafael Espindola b80bacc89a GlobalAlias::isDeclaration is always false. Remove dead code. 
llvm-svn: 196727
 2013-12-08 17:19:18 +00:00
Manman Ren 61fd59421a Debug Info: Move the constant for Debug Info Version from Dwarf.h to Metadata.h. 
Suggested by Eric.
Paired commit with r196144.

llvm-svn: 196145
 2013-12-02 20:10:37 +00:00
Manman Ren ba2fa8b68f Expand comments for Debug Info Version. 
llvm-svn: 196143
 2013-12-02 19:37:35 +00:00
Argyrios Kyrtzidis f405dd62ec [CodeGen] If there is a function definition with duplicate mangled name, emit an error instead of asserting. 
rdar://15522601 & http://llvm.org/PR18031

llvm-svn: 195556
 2013-11-23 18:41:35 +00:00
Manman Ren 4b7f23d885 Debug Info: add a "Debug Info Version" module flag to output the current debug 
info version number.

Will error out when modules have different version numbers.

llvm-svn: 195495
 2013-11-22 19:42:45 +00:00
Hans Wennborg feedf8515b [-cxx-abi microsoft] Emit linkonce_odr definitions for declarations of static data members with inline initializers (PR17689) 
This makes Clang emit a linkonce_odr definition for 'val' in the code below,
to be compatible with MSVC-compiled code:

  struct Foo {
    static const int val = 1;
  };

Differential Revision: http://llvm-reviews.chandlerc.com/D2233

llvm-svn: 195283
 2013-11-21 00:15:56 +00:00
Matt Arsenault 00e65b2afe Fix test failures after addrspacecast added. 
Bitcasts between address spaces are no longer allowed.

llvm-svn: 194765
 2013-11-15 02:19:52 +00:00
Joey Gouly 561bba2e9f [OpenCL] Make sure we put string literals in the constant address space. 
llvm-svn: 194717
 2013-11-14 18:26:10 +00:00
Rafael Espindola 0196a1d98f Keep the old function order in CodeGenModule::applyReplacements. 
The original decls are created when used. The replacements are created at the
end of the TU in reverse order.

This makes the original order far better for testing. This is particularly
important since the replacement logic could be used even when
-mconstructor-aliases is not used, but that would make many tests hard to read.

This is a fixed version of r194357 which handles replacing a destructor with
another which is an alias to a third one.

llvm-svn: 194452
 2013-11-12 04:53:19 +00:00
Rafael Espindola 8d693a3429 Revert "Keep the old function order in CodeGenModule::applyReplacements." 
This reverts commit r194357.

Debugging a cast failure during bootstrap.

llvm-svn: 194358
 2013-11-11 00:37:22 +00:00
Rafael Espindola 732c99c4ae Keep the old function order in CodeGenModule::applyReplacements. 
The original decls are created when used. The replacements are created at the
end of the TU in reverse order.

This makes the original order far better for testing. This is particularly
important since the replacement logic could be used even when
-mconstructor-aliases is not used, but that would make many tests hard to read.

llvm-svn: 194357
 2013-11-10 19:04:30 +00:00
Benjamin Kramer eed8061b9f Avoid double StringMap lookups. No functionality change. 
llvm-svn: 194355
 2013-11-10 16:55:11 +00:00
Rafael Espindola 2e2995bf50 Produce direct calls instead of alias to linkonce_odr functions. 
This is a small optimization on linux, but should help more on windows
where msvc only outputs one destructor if there would be two identical ones.

llvm-svn: 194095
 2013-11-05 21:37:29 +00:00
Richard Smith b47c36f8e1 C++1y sized deallocation: if we have a use, but not a definition, of a sized 
deallocation function (and the corresponding unsized deallocation function has
been declared), emit a weak discardable definition of the function that
forwards to the corresponding unsized deallocation.

This allows a C++ standard library implementation to provide both a sized and
an unsized deallocation function, where the unsized one does not just call the
sized one, for instance by putting both in the same object file within an
archive.

llvm-svn: 194055
 2013-11-05 09:12:18 +00:00
Rafael Espindola 208b5c0fa5 New fix for pr17535. 
This is a fixed version of r193161. In order to handle

    void foo() __attribute__((alias("bar")));
    void bar() {}
    void zed() __attribute__((alias("foo")));

it is not enough to delay aliases to the end of the TU, we have to do two
passes over them to find if they are defined or not.

This can be implemented by producing alias as we go and just doing the second
pass at the end. This has the advantage that other parts of clang that were
expecting alias to be processed in order don't have to be changed.

This patch also handles cyclic aliases.

llvm-svn: 193188
 2013-10-22 19:26:13 +00:00
Rafael Espindola 6956d58722 Revert "This patch causes clang to reject alias attributes that point to undefined names. For example, with this patch we now reject" 
This reverts commit r193161.

It broke

void foo() __attribute__((alias("bar")));
void bar() {}
void zed() __attribute__((alias("foo")));

Looks like we have to fix pr17639 first :-(

llvm-svn: 193162
 2013-10-22 14:23:09 +00:00
Rafael Espindola 0fad0d7724 This patch causes clang to reject alias attributes that point to undefined 
names. For example, with this patch we now reject

void f1(void) __attribute__((alias("g1")));

This patch is implemented in CodeGen. It is quiet a bit simpler and more
compatible with gcc than implementing it in Sema. The downside is that the
errors only fire during -emit-llvm.

llvm-svn: 193161
 2013-10-22 13:51:06 +00:00
Rafael Espindola 8db352d532 Rename some functions for consistency. 
Every other function in Redeclarable.h was using Decl instead of Declaration.

llvm-svn: 192900
 2013-10-17 15:37:26 +00:00
Rafael Espindola 3bfa4688ef Emit a .ident saying that clang produced this file. 
Patch by Katya Romanova.

llvm-svn: 192832
 2013-10-16 19:28:50 +00:00
Manman Ren 4f755deaf6 TBAA: use the same format for scalar TBAA and struct-path aware TBAA. 
An updated version of r191586 with bug fix.

Struct-path aware TBAA generates tags to specify the access path,
while scalar TBAA only generates tags to scalar types.

We should not generate a TBAA tag with null being the first field. When
a TBAA type node is null, the tag should be null too. Make sure we
don't decorate an instruction with a null TBAA tag.

Added a testing case for the bug reported by Richard with -relaxed-aliasing
and -fsanitizer=thread.

llvm-svn: 192145
 2013-10-08 00:08:49 +00:00
Richard Smith e4aaac506c Revert r191586 and r191695. They cause crashes when building with 
-relaxed-aliasing.

llvm-svn: 191725
 2013-10-01 02:20:23 +00:00
Manman Ren 4f04263347 TBAA: use the same format for scalar TBAA and struct-path aware TBAA. 
Struct-path aware TBAA generates tags to specify the access path,
while scalar TBAA only generates tags to scalar types.

llvm-svn: 191586
 2013-09-27 23:06:41 +00:00
David Blaikie b00f360e8f Do not emit duplicate global initializers for template static data members inside namespaces 
A quirk of AST representation leads to class template static data member
definitions being visited twice during Clang IRGen resulting in
duplicate (benign) initializers.

Discovered while investigating a possibly-related debug info bug tickled
by the duplicate emission of these members & their associated debug
info.

With thanks to Richard Smith for help investigating, understanding, and
helping with the fix.

llvm-svn: 189996
 2013-09-04 21:07:37 +00:00
Reid Kleckner b9921df29c Emit uuid globals as linkonce_odr 
Patch by Nico Rieck!

llvm-svn: 189860
 2013-09-03 21:49:32 +00:00
Robert Wilhelm 25284cc95b Use pop_back_val() instead of both back() and pop_back(). 
No functionality change intended.

llvm-svn: 189112
 2013-08-23 16:11:15 +00:00
David Blaikie 4a9ec7b59d PR16933: Don't try to codegen things after we've seen errors. 
Refactor the underlying code a bit to remove unnecessary calls to
"hasErrorOccurred" & make them consistently at all the entry points to
the IRGen ASTConsumer.

llvm-svn: 188707
 2013-08-19 21:02:26 +00:00
David Majnemer bbecd09658 CodeGen: __uuidof should work even with an incomplete _GUID type 
Summary:
We would crash in CodeGen::CodeGenModule::EmitUuidofInitializer
because our attempt to enter CodeGen::CodeGenModule::EmitConstantValue
will be foiled: the type of the constant value is incomplete.

Instead, create an unnamed type with the proper layout on all platforms.
Punt the problem of wrongly defined struct _GUID types to the user.
(It's impossible because the TU may never get to see the type and thus
we can't verify that it is suitable.)

This fixes PR16856.

Reviewers: rsmith, rnk, thakis

Reviewed By: rnk

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1375

llvm-svn: 188481
 2013-08-15 19:59:14 +00:00
David Majnemer 8eaab6ff8e [-cxx-abi microsoft] Mangle __uuidof correctly into template parameters 
Summary:
It seems that __uuidof introduces a global extern "C" declaration of
type __s_GUID.  However, our implementation of __uuidof does not provide
such a declaration and thus must open-code the mangling for __uuidof in
template parameters.

This allows us to codegen scoped COM pointers and other such things.

This fixes PR16836.
Depends on D1356.

Reviewers: rnk, cdavis5x, rsmith

Reviewed By: rnk

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1357

llvm-svn: 188252
 2013-08-13 06:32:20 +00:00
Alexey Samsonov d6e043ba1f Use new llvm::SpecialCaseList API in CodeGenModule 
llvm-svn: 188170
 2013-08-12 11:48:05 +00:00
David Majnemer cf963cece8 [-cxx-abi microsoft] Mangle UUIDs correctly, stick them in the proper section 
Revert r188055 which reverted r188053. An unrelated change previously snuck in.

llvm-svn: 188060
 2013-08-09 08:35:59 +00:00
David Majnemer a2724ae4b3 Revert "[-cxx-abi microsoft] Mangle UUIDs correctly, stick them in the proper section" 
This commit reverts r188053.

It is breaking the build bots.

llvm-svn: 188055
 2013-08-09 05:56:24 +00:00
David Majnemer 94a76b64e0 [-cxx-abi microsoft] Mangle UUIDs correctly, stick them in the proper section 
We mangled them like:
L___uuid_12345678-1234-1234-1234-123456789abc

We should've mangled them like:
__GUID_12345678_1234_1234_1234_123456789abc

Furthermore, they are external symbols.

llvm-svn: 188053
 2013-08-09 05:09:04 +00:00
Larisse Voufo 39a1e507ff Started implementing variable templates. Top level declarations should be fully supported, up to some limitations documented as FIXMEs or TODO. Static data member templates work very partially. Static data member templates of class templates need particular attention... 
llvm-svn: 187762
 2013-08-06 01:03:05 +00:00
Timur Iskhodzhanov 40f2fa9a45 Emit the constructor for abstract classes when using -cxx-abi microsoft, fixes PR16735 
llvm-svn: 187709
 2013-08-04 17:30:04 +00:00
Reid Kleckner e7de47efbe [ms-cxxabi] Emit linkonce complete dtors in TUs that need them 
Based on Peter Collingbourne's destructor patches.

Prior to this change, clang was considering ?1 to be the complete
destructor and the base destructor, which was wrong.  This lead to
crashes when clang tried to emit two LLVM functions with the same name.

In this ABI, TUs with non-inline dtors might not emit a complete
destructor.  They are emitted as inline thunks in TUs that need them,
and they always delegate to the base dtors of the complete class and its
virtual bases.  This change uses the DeferredDecls machinery to emit
complete dtors as needed.

Currently in clang try body destructors can catch exceptions thrown by
virtual base destructors.  In the Microsoft C++ ABI, clang may not have
the destructor definition, in which case clang won't wrap the virtual
virtual base destructor calls in a try-catch.  Diagnosing this in user
code is TODO.

Finally, for classes that don't use virtual inheritance, MSVC always
calls the base destructor (?1) directly.  This is a useful code size
optimization that avoids emitting lots of extra thunks or aliases.
Implementing it also means our existing tests continue to pass, and is
consistent with MSVC's output.

We can do the same for Itanium by tweaking GetAddrOfCXXDestructor, but
it will require further testing.

Reviewers: rjmccall

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1066

llvm-svn: 186828
 2013-07-22 13:51:44 +00:00
Reid Kleckner f6ce2b5f2e Rename D to GD to match the type, which is GlobalDecl 
Now we can save GD.getDecl() in D and shorten some casts.

llvm-svn: 186826
 2013-07-22 13:07:10 +00:00
Richard Smith 8d0dc31dca Tighten up the set of operator new/operator delete calls we're permitted to 
optimize, to follow the permissions granted in N3664. Under those rules, only
calls generated by new-expressions and delete-expressions are permitted to be
optimized, and direct calls to ::operator new and ::operator delete must be
treated as normal calls.

llvm-svn: 186799
 2013-07-21 23:12:18 +00:00
Eli Friedman 8978a9dd0a Get rid of dead/useless code for block mangling. 
llvm-svn: 185989
 2013-07-10 01:13:27 +00:00
Eli Friedman c48d31c31c Simplify linkage code for static local vars. 
The key insight here is that weak linkage for a static local variable
should always mean linkonce_odr, because every file that needs it will
generate a definition.  We don't actually care about the precise linkage
of the parent context.  I feel a bit silly that I didn't realize this before.

llvm-svn: 185381
 2013-07-01 20:53:07 +00:00
Eli Friedman 7e346a8127 Fix mangling for block literals. 
Blocks, like lambdas, can be written in contexts which are required to be
treated as the same under ODR.  Unlike lambdas, it isn't possible to actually
take the address of a block, so the mangling of the block itself doesn't
matter. However, objects like static variables inside a block do need to
be mangled in a consistent way.

There are basically three components here. One, block literals need a
consistent numbering.  Two, objects/types inside a block literal need
to be mangled using it.  Three, objects/types inside a block literal need
to have their linkage computed correctly.

llvm-svn: 185372
 2013-07-01 20:22:57 +00:00
Stephen Lin 9dc6eef755 Restore r184205 and associated commits (after commit of r185290) 
This allows clang to use the backend parameter attribute 'returned' when generating 'this'-returning constructors and destructors in ARM and MSVC C++ ABIs.

llvm-svn: 185291
 2013-06-30 20:40:16 +00:00
Stephen Lin 19cee1871e Revert r184205 and associated patches while investigating issue with broken buildbot (possible interaction with LTO) 
<rdar://problem/14209661>

llvm-svn: 184384
 2013-06-19 23:23:19 +00:00
NAKAMURA Takumi 9157b55c3c Fix a warning. [-Wunused-variable] 
llvm-svn: 184284
 2013-06-19 06:58:20 +00:00
Manman Ren 9691f7fa35 Debug Info: support for gdwarf-2 gdwarf-3 gdwarf-4 
These options will add a module flag with name "Dwarf Version".
The behavior flag is currently set to Warning, so when two values disagree,
a warning will be emitted.

llvm-svn: 184276
 2013-06-19 01:46:49 +00:00
Stephen Lin a637fb8ccd CodeGen: Have 'this'-returning constructors and destructors to take advantage of the new backend 'returned' attribute. 
The backend will now use the generic 'returned' attribute to form tail calls where possible, as well as avoid save-restores of 'this' in some cases (specifically the cases that matter for the ARM C++ ABI).

This patch also reverts a prior front-end only partial implementation of these optimizations, since it's no longer required.

llvm-svn: 184205
 2013-06-18 17:00:49 +00:00
Richard Smith a509f2fdfa Emit initializers for static-storage-duration temporaries as constants where 
possible.

llvm-svn: 183967
 2013-06-14 03:07:01 +00:00
Eli Friedman d4b6e7a9b7 Fix the linkage of static locals inside a CapturedStmt. (Found in the 
process of trying to fix the related issue for block literals.)

llvm-svn: 183951
 2013-06-13 21:50:44 +00:00
Richard Smith cc1b96d356 PR12086, PR15117 
Introduce CXXStdInitializerListExpr node, representing the implicit
construction of a std::initializer_list<T> object from its underlying array.
The AST representation of such an expression goes from an InitListExpr with a
flag set, to a CXXStdInitializerListExpr containing a MaterializeTemporaryExpr
containing an InitListExpr (possibly wrapped in a CXXBindTemporaryExpr).

This more detailed representation has several advantages, the most important of
which is that the new MaterializeTemporaryExpr allows us to directly model
lifetime extension of the underlying temporary array. Using that, this patch
*drastically* simplifies the IR generation of this construct, provides IR
generation support for nested global initializer_list objects, fixes several
bugs where the destructors for the underlying array would accidentally not get
invoked, and provides constant expression evaluation support for
std::initializer_list objects.

llvm-svn: 183872
 2013-06-12 22:31:48 +00:00
Peter Collingbourne 4d90dba742 [ms-cxxabi] Thread GlobalDecls through to CodeGenModule::getFunctionLinkage. 
This is so that we can give destructor variants different linkage later.

Differential Revision: http://llvm-reviews.chandlerc.com/D819

llvm-svn: 183324
 2013-06-05 17:49:37 +00:00
Richard Smith e6c0144208 Model temporary lifetime-extension explicitly in the AST. Use this model to 
handle temporaries which have been lifetime-extended to static storage duration
within constant expressions. This correctly handles nested lifetime extension
(through reference members of aggregates in aggregate initializers) but
non-constant-expression emission hasn't yet been updated to do the same.

llvm-svn: 183283
 2013-06-05 00:46:14 +00:00
Aaron Ballman 5d041beb4e Adding support for MSVC #pragma detect_mismatch functionality by emitting a FAILIFMISMATCH linker command into the object file. 
llvm-svn: 183178
 2013-06-04 02:07:14 +00:00
Diego Novillo 5f2b1ce21e [PATCH] Generate cold attribute for functions marked __atribute__((cold)) 
This removes a FIXME in CodeGenModule::SetLLVMFunctionAttributesForDefinition.
When a function is declared cold we can now generate the IR attribute in
addition to marking the function to be optimized for size.

I tried adding a separate CHECK in the existing test, but it was
failing.  I suppose CHECK matches one line exactly once?  This would be
a problem if the attributes are listed in a different order, though they
seem to be sorted.

llvm-svn: 182666
 2013-05-24 20:18:15 +00:00
David Blaikie f121b9302e PR14606: Debug Info for namespace aliases/DW_TAG_imported_module 
This resolves the last of the PR14606 failures in the GDB 7.5 test
suite. (but there are still unresolved issues in the imported_decl case
- we need to implement optional/lazy decls for functions & variables
like we already do for types)

llvm-svn: 182329
 2013-05-20 22:50:41 +00:00
Reid Kleckner b144d36693 Implement __declspec(selectany) under -fms-extensions 
selectany only applies to externally visible global variables.  It has
the effect of making the data weak_odr.

The MSDN docs suggest that unused definitions can only be dropped at
linktime, so Clang uses weak instead of linkonce.  MSVC optimizes away
references to constant selectany data, so it must assume that there is
only one definition, hence weak_odr.

Reviewers: espindola

Differential Revision: http://llvm-reviews.chandlerc.com/D814

llvm-svn: 182266
 2013-05-20 14:02:37 +00:00
Rafael Espindola 3ae00052cd Cleanup handling of UniqueExternalLinkage. 
This patch renames getLinkage to getLinkageInternal. Only code that
needs to handle UniqueExternalLinkage specially should call this.

Linkage, as defined in the c++ standard, is provided by
getFormalLinkage. It maps UniqueExternalLinkage to ExternalLinkage.

Most places in the compiler actually want isExternallyVisible, which
handles UniqueExternalLinkage as internal.

llvm-svn: 181677
 2013-05-13 00:12:11 +00:00
Benjamin Kramer 2960dbddbb CodeGen: Refactor SetLLVMFunctionAttributesForDefinition to use an AttrBuilder. 
Adding attributes to a uniqued set has become expensive, don't do it more often
than necessary. No functionality change.

llvm-svn: 181662
 2013-05-11 12:45:37 +00:00
Adrian Prantl ffcf4ba947 Debug Info: Fix a problem that resulted in missing DW_AT_specifications 
for C++ constructors.

If the DIType for a class was generated by
CGDebugInfo::createContextChain(), the cache contains only a
limited DIType wihtout any declarations. Since EmitFunctionStart()
needs to find the canonical declaration for each method, we
construct the complete type before emitting any method.

rdar://problem/13116508

llvm-svn: 181561
 2013-05-09 23:16:27 +00:00
Reid Kleckner e43f0fea15 Forward #pragma comment(lib/linker) through as flags metadata 
Summary:
Most of this change is wiring the pragma all the way through from the
lexer, parser, and sema to codegen.  I considered adding a Decl AST node
for this, but it seemed too heavyweight.

Mach-O already uses a metadata flag called "Linker Options" to do this
kind of auto-linking.  This change follows that pattern.

LLVM knows how to forward the "Linker Options" metadata into the COFF
.drectve section where these flags belong.  ELF support is not
implemented, but possible.

This is related to auto-linking, which is http://llvm.org/PR13016.

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D723

llvm-svn: 181426
 2013-05-08 13:44:39 +00:00
Ulrich Weigand fa80642205 Allow targets to define minimum alignment for global variables 
This patch adds a new common code feature that allows platform code to
request minimum alignment of global symbols.  The background for this is
that on SystemZ, the most efficient way to load addresses of global symbol
is the LOAD ADDRESS RELATIVE LONG (LARL) instruction.  This instruction
provides PC-relative addressing, but only to *even* addresses.  For this
reason, existing compilers will guarantee that global symbols are always
aligned to at least 2.  [ Since symbols would otherwise already use a
default alignment based on their type, this will usually only affect global
objects of character type or character arrays. ]  GCC also allows creating
symbols without that extra alignment by using explicit "aligned" attributes
(which then need to be used on both definition and each use of the symbol).

To enable support for this with Clang, this patch adds a
TargetInfo::MinGlobalAlign variable that provides a global minimum for the
alignment of every global object (unless overridden via explicit alignment
attribute), and adds code to respect this setting.  Within this patch, no
platform actually sets the value to anything but the default 1, resulting
in no change in behaviour on any existing target.

This version of the patch incorporates feedback from reviews by
Eric Christopher and John McCall.  Thanks to all reviewers!

Patch by Richard Sandiford.

llvm-svn: 181210
 2013-05-06 16:23:57 +00:00
Rafael Espindola 593537a979 Make all 'is in extern "C"' tests use the lexical context. 
I was not able to find a case (other than the fix in r181163) where this
makes a difference, but it is a more obviously correct API to have.

llvm-svn: 181165
 2013-05-05 20:15:21 +00:00
Enea Zaffanella acb8ecd664 In VarDecl nodes, store the thread storage class specifier as written. 
llvm-svn: 181113
 2013-05-04 08:27:07 +00:00
Bill Wendling 95cae88bcf Use the Itanium ABI for thread_local on Darwin. 
After some discussion, it was decided to use the Itanium ABI for thread_local on
Darwin OS X platforms. This involved a couple of changes. First, we use
"_tlv_atexit" instead of "__cxa_thread_atexit". Secondly, the global variables
are marked with 'internal' linkage, because we want all access to be calls to
the Itanium-specific entry point, which has normal linkage.
<rdar://problem/13733006>

llvm-svn: 180941
 2013-05-02 19:18:03 +00:00
Richard Smith e6c878c0c6 Revert r180739 and r180748: they broke C++11 thread_local on non-Darwin systems and did not do the right thing on Darwin. 
Original commit message:

Emit the TLS intialization functions into a list.

Add the TLS initialization functions to a list of initialization functions. The
back-end takes this list and places the function pointers into the correct
section. This way they're called before `main().'

<rdar://problem/13733006>

llvm-svn: 180809
 2013-04-30 21:34:13 +00:00
Bill Wendling 96a77693be Emit the TLS intialization functions into a list. 
Add the TLS initialization functions to a list of initialization functions. The
back-end takes this list and places the function pointers into the correct
section. This way they're called before `main().'

<rdar://problem/13733006>

llvm-svn: 180739
 2013-04-29 22:27:16 +00:00
David Blaikie 60a9fbf921 Support debug info for using directives at global/namespace scope. 
llvm-svn: 180594
 2013-04-26 05:41:06 +00:00
Richard Smith 1847baa20e Don't emit _ZTW wrappers for TLS variables which don't use the C++ thread_local keyword. 
llvm-svn: 180004
 2013-04-22 08:06:17 +00:00
Richard Smith 2fd1d7aee3 Implement CodeGen for C++11 thread_local, following the Itanium ABI specification as discussed on cxx-abi-dev. 
llvm-svn: 179858
 2013-04-19 16:42:07 +00:00
John McCall 568d4100e7 Don't propagate around TargetOptions in IR-gen; we don't use it. 
Patch by Stephen Lin!

llvm-svn: 179639
 2013-04-16 22:48:20 +00:00
John McCall c8e0170578 Standardize accesses to the TargetInfo in IR-gen. 
Patch by Stephen Lin!

llvm-svn: 179638
 2013-04-16 22:48:15 +00:00
Daniel Dunbar e246fbe40b [Modules] Convert module specific -fno-modules-autolink into -fno-autolink. 
- There is no reason to have a modules specific flag for disabling
   autolinking. Instead, convert the existing flag into -fno-autolink (which
   should cover other autolinking code generation paths like #pragmas if and
   when we support them).

llvm-svn: 179612
 2013-04-16 18:21:19 +00:00
Fariborz Jahanian d1b6778e69 Objective-C IRGen. Use llvm::WeakVH 
for caching couple of global symbols used
for generation of CF/NS string meta-data
so they are not released prematuely in certain
corner cases. // rdar:// 13598026.
Reviewed by John M.

llvm-svn: 179599
 2013-04-16 15:25:39 +00:00
Richard Smith dbf74baee5 CodeGen support for function-local static thread_local variables with 
non-constant constructors or non-trivial destructors. Plus bugfixes for
thread_local references bound to temporaries (the temporaries themselves are
lifetime-extended to become thread_local), and the corresponding case for
std::initializer_list.

llvm-svn: 179496
 2013-04-14 23:01:42 +00:00
Richard Smith fd3834f7a1 Annotate flavor of TLS variable (statically or dynamically initialized) onto the AST. 
llvm-svn: 179447
 2013-04-13 02:43:54 +00:00
Richard Smith f21c9617f8 Use MapVector rather than simulating it. 
llvm-svn: 179438
 2013-04-13 01:28:18 +00:00
Manman Ren e1ad74e6fd Struct-path aware TBAA: uniformize scalar tag and path tag. 
For struct-path aware TBAA, we used to use scalar type node as the scalar tag,
which has an incompatible format with the struct path tag. We now use the same
format: base type, access type and offset.

We also uniformize the scalar type node and the struct type node: name, a list
of pairs (offset + pointer to MDNode). For scalar type, we have a single pair.
These are to make implementaiton of aliasing rules easier.

llvm-svn: 179335
 2013-04-11 23:02:56 +00:00
Richard Smith 85465e608d Remove nondeterminism introduced in r178950. 
llvm-svn: 178952
 2013-04-06 07:07:44 +00:00
Richard Smith df931ce82c When an internal-linkage function or variable is declared within an extern "C" 
linkage specification, and is marked as __attribute__((used)), try to also give
it the unmangled name (by emitting an internal linkage alias) if nothing else
within the translation unit would use that name. This allows inline asm in that
translation unit to use the entity via its unmangled name, which people
apparently rely on.

llvm-svn: 178950
 2013-04-06 05:00:46 +00:00
Manman Ren c451e5766e Initial support for struct-path aware TBAA. 
Added TBAABaseType and TBAAOffset in LValue. These two fields are initialized to
the actual type and 0, and are updated in EmitLValueForField.
Path-aware TBAA tags are enabled for EmitLoadOfScalar and EmitStoreOfScalar.
Added command line option -struct-path-tbaa.

llvm-svn: 178797
 2013-04-04 21:53:22 +00:00
Manman Ren 092d9e8f3b revert r178784 since it does not have a commit message 
llvm-svn: 178796
 2013-04-04 21:51:07 +00:00
Manman Ren 037d2b252d Index: include/clang/Driver/CC1Options.td 
===================================================================
--- include/clang/Driver/CC1Options.td	(revision 178718)
+++ include/clang/Driver/CC1Options.td	(working copy)
@@ -161,6 +161,8 @@
   HelpText<"Use register sized accesses to bit-fields, when possible.">;
 def relaxed_aliasing : Flag<["-"], "relaxed-aliasing">,
   HelpText<"Turn off Type Based Alias Analysis">;
+def struct_path_tbaa : Flag<["-"], "struct-path-tbaa">,
+  HelpText<"Turn on struct-path aware Type Based Alias Analysis">;
 def masm_verbose : Flag<["-"], "masm-verbose">,
   HelpText<"Generate verbose assembly output">;
 def mcode_model : Separate<["-"], "mcode-model">,
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td	(revision 178718)
+++ include/clang/Driver/Options.td	(working copy)
@@ -587,6 +587,7 @@
   Flags<[CC1Option]>, HelpText<"Disable spell-checking">;
 def fno_stack_protector : Flag<["-"], "fno-stack-protector">, Group<f_Group>;
 def fno_strict_aliasing : Flag<["-"], "fno-strict-aliasing">, Group<f_Group>;
+def fstruct_path_tbaa : Flag<["-"], "fstruct-path-tbaa">, Group<f_Group>;
 def fno_strict_enums : Flag<["-"], "fno-strict-enums">, Group<f_Group>;
 def fno_strict_overflow : Flag<["-"], "fno-strict-overflow">, Group<f_Group>;
 def fno_threadsafe_statics : Flag<["-"], "fno-threadsafe-statics">, Group<f_Group>,
Index: include/clang/Frontend/CodeGenOptions.def
===================================================================
--- include/clang/Frontend/CodeGenOptions.def	(revision 178718)
+++ include/clang/Frontend/CodeGenOptions.def	(working copy)
@@ -85,6 +85,7 @@
 VALUE_CODEGENOPT(OptimizeSize, 2, 0) ///< If -Os (==1) or -Oz (==2) is specified.
 CODEGENOPT(RelaxAll          , 1, 0) ///< Relax all machine code instructions.
 CODEGENOPT(RelaxedAliasing   , 1, 0) ///< Set when -fno-strict-aliasing is enabled.
+CODEGENOPT(StructPathTBAA    , 1, 0) ///< Whether or not to use struct-path TBAA.
 CODEGENOPT(SaveTempLabels    , 1, 0) ///< Save temporary labels.
 CODEGENOPT(SanitizeAddressZeroBaseShadow , 1, 0) ///< Map shadow memory at zero
                                                  ///< offset in AddressSanitizer.
Index: lib/CodeGen/CGExpr.cpp
===================================================================
--- lib/CodeGen/CGExpr.cpp	(revision 178718)
+++ lib/CodeGen/CGExpr.cpp	(working copy)
@@ -1044,7 +1044,8 @@
 llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue) {
   return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
                           lvalue.getAlignment().getQuantity(),
-                          lvalue.getType(), lvalue.getTBAAInfo());
+                          lvalue.getType(), lvalue.getTBAAInfo(),
+                          lvalue.getTBAABaseType(), lvalue.getTBAAOffset());
 }
 
 static bool hasBooleanRepresentation(QualType Ty) {
@@ -1106,7 +1107,9 @@
 
 llvm::Value *CodeGenFunction::EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
                                               unsigned Alignment, QualType Ty,
-                                              llvm::MDNode *TBAAInfo) {
+                                              llvm::MDNode *TBAAInfo,
+                                              QualType TBAABaseType,
+                                              uint64_t TBAAOffset) {
   // For better performance, handle vector loads differently.
   if (Ty->isVectorType()) {
     llvm::Value *V;
@@ -1158,8 +1161,11 @@
     Load->setVolatile(true);
   if (Alignment)
     Load->setAlignment(Alignment);
-  if (TBAAInfo)
-    CGM.DecorateInstruction(Load, TBAAInfo);
+  if (TBAAInfo) {
+    llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
+                                                      TBAAOffset);
+    CGM.DecorateInstruction(Load, TBAAPath);
+  }
 
   if ((SanOpts->Bool && hasBooleanRepresentation(Ty)) ||
       (SanOpts->Enum && Ty->getAs<EnumType>())) {
@@ -1217,7 +1223,8 @@
                                         bool Volatile, unsigned Alignment,
                                         QualType Ty,
                                         llvm::MDNode *TBAAInfo,
-                                        bool isInit) {
+                                        bool isInit, QualType TBAABaseType,
+                                        uint64_t TBAAOffset) {
   
   // Handle vectors differently to get better performance.
   if (Ty->isVectorType()) {
@@ -1268,15 +1275,19 @@
   llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
   if (Alignment)
     Store->setAlignment(Alignment);
-  if (TBAAInfo)
-    CGM.DecorateInstruction(Store, TBAAInfo);
+  if (TBAAInfo) {
+    llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
+                                                      TBAAOffset);
+    CGM.DecorateInstruction(Store, TBAAPath);
+  }
 }
 
 void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
                                         bool isInit) {
   EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
                     lvalue.getAlignment().getQuantity(), lvalue.getType(),
-                    lvalue.getTBAAInfo(), isInit);
+                    lvalue.getTBAAInfo(), isInit, lvalue.getTBAABaseType(),
+                    lvalue.getTBAAOffset());
 }
 
 /// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
@@ -2494,9 +2505,12 @@
 
   llvm::Value *addr = base.getAddress();
   unsigned cvr = base.getVRQualifiers();
+  bool TBAAPath = CGM.getCodeGenOpts().StructPathTBAA;
   if (rec->isUnion()) {
     // For unions, there is no pointer adjustment.
     assert(!type->isReferenceType() && "union has reference member");
+    // TODO: handle path-aware TBAA for union.
+    TBAAPath = false;
   } else {
     // For structs, we GEP to the field that the record layout suggests.
     unsigned idx = CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
@@ -2508,6 +2522,8 @@
       if (cvr & Qualifiers::Volatile) load->setVolatile(true);
       load->setAlignment(alignment.getQuantity());
 
+      // Loading the reference will disable path-aware TBAA.
+      TBAAPath = false;
       if (CGM.shouldUseTBAA()) {
         llvm::MDNode *tbaa;
         if (mayAlias)
@@ -2541,6 +2557,16 @@
 
   LValue LV = MakeAddrLValue(addr, type, alignment);
   LV.getQuals().addCVRQualifiers(cvr);
+  if (TBAAPath) {
+    const ASTRecordLayout &Layout =
+        getContext().getASTRecordLayout(field->getParent());
+    // Set the base type to be the base type of the base LValue and
+    // update offset to be relative to the base type.
+    LV.setTBAABaseType(base.getTBAABaseType());
+    LV.setTBAAOffset(base.getTBAAOffset() +
+                     Layout.getFieldOffset(field->getFieldIndex()) /
+                                           getContext().getCharWidth());
+  }
 
   // __weak attribute on a field is ignored.
   if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
Index: lib/CodeGen/CGValue.h
===================================================================
--- lib/CodeGen/CGValue.h	(revision 178718)
+++ lib/CodeGen/CGValue.h	(working copy)
@@ -157,6 +157,11 @@
 
   Expr *BaseIvarExp;
 
+  /// Used by struct-path-aware TBAA.
+  QualType TBAABaseType;
+  /// Offset relative to the base type.
+  uint64_t TBAAOffset;
+
   /// TBAAInfo - TBAA information to attach to dereferences of this LValue.
   llvm::MDNode *TBAAInfo;
 
@@ -175,6 +180,10 @@
     this->ImpreciseLifetime = false;
     this->ThreadLocalRef = false;
     this->BaseIvarExp = 0;
+
+    // Initialize fields for TBAA.
+    this->TBAABaseType = Type;
+    this->TBAAOffset = 0;
     this->TBAAInfo = TBAAInfo;
   }
 
@@ -232,6 +241,12 @@
   Expr *getBaseIvarExp() const { return BaseIvarExp; }
   void setBaseIvarExp(Expr *V) { BaseIvarExp = V; }
 
+  QualType getTBAABaseType() const { return TBAABaseType; }
+  void setTBAABaseType(QualType T) { TBAABaseType = T; }
+
+  uint64_t getTBAAOffset() const { return TBAAOffset; }
+  void setTBAAOffset(uint64_t O) { TBAAOffset = O; }
+
   llvm::MDNode *getTBAAInfo() const { return TBAAInfo; }
   void setTBAAInfo(llvm::MDNode *N) { TBAAInfo = N; }
 
Index: lib/CodeGen/CodeGenFunction.h
===================================================================
--- lib/CodeGen/CodeGenFunction.h	(revision 178718)
+++ lib/CodeGen/CodeGenFunction.h	(working copy)
@@ -2211,7 +2211,9 @@
   /// the LLVM value representation.
   llvm::Value *EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
                                 unsigned Alignment, QualType Ty,
-                                llvm::MDNode *TBAAInfo = 0);
+                                llvm::MDNode *TBAAInfo = 0,
+                                QualType TBAABaseTy = QualType(),
+                                uint64_t TBAAOffset = 0);
 
   /// EmitLoadOfScalar - Load a scalar value from an address, taking
   /// care to appropriately convert from the memory representation to
@@ -2224,7 +2226,9 @@
   /// the LLVM value representation.
   void EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
                          bool Volatile, unsigned Alignment, QualType Ty,
-                         llvm::MDNode *TBAAInfo = 0, bool isInit=false);
+                         llvm::MDNode *TBAAInfo = 0, bool isInit = false,
+                         QualType TBAABaseTy = QualType(),
+                         uint64_t TBAAOffset = 0);
 
   /// EmitStoreOfScalar - Store a scalar value to an address, taking
   /// care to appropriately convert from the memory representation to
Index: lib/CodeGen/CodeGenModule.cpp
===================================================================
--- lib/CodeGen/CodeGenModule.cpp	(revision 178718)
+++ lib/CodeGen/CodeGenModule.cpp	(working copy)
@@ -227,6 +227,20 @@
   return TBAA->getTBAAStructInfo(QTy);
 }
 
+llvm::MDNode *CodeGenModule::getTBAAStructTypeInfo(QualType QTy) {
+  if (!TBAA)
+    return 0;
+  return TBAA->getTBAAStructTypeInfo(QTy);
+}
+
+llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
+                                                  llvm::MDNode *AccessN,
+                                                  uint64_t O) {
+  if (!TBAA)
+    return 0;
+  return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
+}
+
 void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
                                         llvm::MDNode *TBAAInfo) {
   Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
Index: lib/CodeGen/CodeGenModule.h
===================================================================
--- lib/CodeGen/CodeGenModule.h	(revision 178718)
+++ lib/CodeGen/CodeGenModule.h	(working copy)
@@ -501,6 +501,11 @@
   llvm::MDNode *getTBAAInfo(QualType QTy);
   llvm::MDNode *getTBAAInfoForVTablePtr();
   llvm::MDNode *getTBAAStructInfo(QualType QTy);
+  /// Return the MDNode in the type DAG for the given struct type.
+  llvm::MDNode *getTBAAStructTypeInfo(QualType QTy);
+  /// Return the path-aware tag for given base type, access node and offset.
+  llvm::MDNode *getTBAAStructTagInfo(QualType BaseTy, llvm::MDNode *AccessN,
+                                     uint64_t O);
 
   bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor);
 
Index: lib/CodeGen/CodeGenTBAA.cpp
===================================================================
--- lib/CodeGen/CodeGenTBAA.cpp	(revision 178718)
+++ lib/CodeGen/CodeGenTBAA.cpp	(working copy)
@@ -21,6 +21,7 @@
 #include "clang/AST/Mangle.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/Frontend/CodeGenOptions.h"
+#include "llvm/ADT/SmallSet.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Metadata.h"
@@ -225,3 +226,87 @@
   // For now, handle any other kind of type conservatively.
   return StructMetadataCache[Ty] = NULL;
 }
+
+/// Check if the given type can be handled by path-aware TBAA.
+static bool isTBAAPathStruct(QualType QTy) {
+  if (const RecordType *TTy = QTy->getAs<RecordType>()) {
+    const RecordDecl *RD = TTy->getDecl()->getDefinition();
+    // RD can be struct, union, class, interface or enum.
+    // For now, we only handle struct.
+    if (RD->isStruct() && !RD->hasFlexibleArrayMember())
+      return true;
+  }
+  return false;
+}
+
+llvm::MDNode *
+CodeGenTBAA::getTBAAStructTypeInfo(QualType QTy) {
+  const Type *Ty = Context.getCanonicalType(QTy).getTypePtr();
+  assert(isTBAAPathStruct(QTy));
+
+  if (llvm::MDNode *N = StructTypeMetadataCache[Ty])
+    return N;
+
+  if (const RecordType *TTy = QTy->getAs<RecordType>()) {
+    const RecordDecl *RD = TTy->getDecl()->getDefinition();
+
+    const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
+    SmallVector <std::pair<uint64_t, llvm::MDNode*>, 4> Fields;
+    // To reduce the size of MDNode for a given struct type, we only output
+    // once for all the fields with the same scalar types.
+    // Offsets for scalar fields in the type DAG are not used.
+    llvm::SmallSet <llvm::MDNode*, 4> ScalarFieldTypes;
+    unsigned idx = 0;
+    for (RecordDecl::field_iterator i = RD->field_begin(),
+         e = RD->field_end(); i != e; ++i, ++idx) {
+      QualType FieldQTy = i->getType();
+      llvm::MDNode *FieldNode;
+      if (isTBAAPathStruct(FieldQTy))
+        FieldNode = getTBAAStructTypeInfo(FieldQTy);
+      else {
+        FieldNode = getTBAAInfo(FieldQTy);
+        // Ignore this field if the type already exists.
+        if (ScalarFieldTypes.count(FieldNode))
+          continue;
+        ScalarFieldTypes.insert(FieldNode);
+       }
+      if (!FieldNode)
+        return StructTypeMetadataCache[Ty] = NULL;
+      Fields.push_back(std::make_pair(
+          Layout.getFieldOffset(idx) / Context.getCharWidth(), FieldNode));
+    }
+
+    // TODO: This is using the RTTI name. Is there a better way to get
+    // a unique string for a type?
+    SmallString<256> OutName;
+    llvm::raw_svector_ostream Out(OutName);
+    MContext.mangleCXXRTTIName(QualType(Ty, 0), Out);
+    Out.flush();
+    // Create the struct type node with a vector of pairs (offset, type).
+    return StructTypeMetadataCache[Ty] =
+      MDHelper.createTBAAStructTypeNode(OutName, Fields);
+  }
+
+  return StructMetadataCache[Ty] = NULL;
+}
+
+llvm::MDNode *
+CodeGenTBAA::getTBAAStructTagInfo(QualType BaseQTy, llvm::MDNode *AccessNode,
+                                  uint64_t Offset) {
+  if (!CodeGenOpts.StructPathTBAA)
+    return AccessNode;
+
+  const Type *BTy = Context.getCanonicalType(BaseQTy).getTypePtr();
+  TBAAPathTag PathTag = TBAAPathTag(BTy, AccessNode, Offset);
+  if (llvm::MDNode *N = StructTagMetadataCache[PathTag])
+    return N;
+
+  llvm::MDNode *BNode = 0;
+  if (isTBAAPathStruct(BaseQTy))
+    BNode  = getTBAAStructTypeInfo(BaseQTy);
+  if (!BNode)
+    return StructTagMetadataCache[PathTag] = AccessNode;
+
+  return StructTagMetadataCache[PathTag] =
+    MDHelper.createTBAAStructTagNode(BNode, AccessNode, Offset);
+}
Index: lib/CodeGen/CodeGenTBAA.h
===================================================================
--- lib/CodeGen/CodeGenTBAA.h	(revision 178718)
+++ lib/CodeGen/CodeGenTBAA.h	(working copy)
@@ -35,6 +35,14 @@
 namespace CodeGen {
   class CGRecordLayout;
 
+  struct TBAAPathTag {
+    TBAAPathTag(const Type *B, const llvm::MDNode *A, uint64_t O)
+      : BaseT(B), AccessN(A), Offset(O) {}
+    const Type *BaseT;
+    const llvm::MDNode *AccessN;
+    uint64_t Offset;
+  };
+
 /// CodeGenTBAA - This class organizes the cross-module state that is used
 /// while lowering AST types to LLVM types.
 class CodeGenTBAA {
@@ -46,8 +54,13 @@
   // MDHelper - Helper for creating metadata.
   llvm::MDBuilder MDHelper;
 
-  /// MetadataCache - This maps clang::Types to llvm::MDNodes describing them.
+  /// MetadataCache - This maps clang::Types to scalar llvm::MDNodes describing
+  /// them.
   llvm::DenseMap<const Type *, llvm::MDNode *> MetadataCache;
+  /// This maps clang::Types to a struct node in the type DAG.
+  llvm::DenseMap<const Type *, llvm::MDNode *> StructTypeMetadataCache;
+  /// This maps TBAAPathTags to a tag node.
+  llvm::DenseMap<TBAAPathTag, llvm::MDNode *> StructTagMetadataCache;
 
   /// StructMetadataCache - This maps clang::Types to llvm::MDNodes describing
   /// them for struct assignments.
@@ -89,9 +102,49 @@
   /// getTBAAStructInfo - Get the TBAAStruct MDNode to be used for a memcpy of
   /// the given type.
   llvm::MDNode *getTBAAStructInfo(QualType QTy);
+
+  /// Get the MDNode in the type DAG for given struct type QType.
+  llvm::MDNode *getTBAAStructTypeInfo(QualType QType);
+  /// Get the tag MDNode for a given base type, the actual sclar access MDNode
+  /// and offset into the base type.
+  llvm::MDNode *getTBAAStructTagInfo(QualType BaseQType,
+                                     llvm::MDNode *AccessNode, uint64_t Offset);
 };
 
 }  // end namespace CodeGen
 }  // end namespace clang
 
+namespace llvm {
+
+template<> struct DenseMapInfo<clang::CodeGen::TBAAPathTag> {
+  static clang::CodeGen::TBAAPathTag getEmptyKey() {
+    return clang::CodeGen::TBAAPathTag(
+      DenseMapInfo<const clang::Type *>::getEmptyKey(),
+      DenseMapInfo<const MDNode *>::getEmptyKey(),
+      DenseMapInfo<uint64_t>::getEmptyKey());
+  }
+
+  static clang::CodeGen::TBAAPathTag getTombstoneKey() {
+    return clang::CodeGen::TBAAPathTag(
+      DenseMapInfo<const clang::Type *>::getTombstoneKey(),
+      DenseMapInfo<const MDNode *>::getTombstoneKey(),
+      DenseMapInfo<uint64_t>::getTombstoneKey());
+  }
+
+  static unsigned getHashValue(const clang::CodeGen::TBAAPathTag &Val) {
+    return DenseMapInfo<const clang::Type *>::getHashValue(Val.BaseT) ^
+           DenseMapInfo<const MDNode *>::getHashValue(Val.AccessN) ^
+           DenseMapInfo<uint64_t>::getHashValue(Val.Offset);
+  }
+
+  static bool isEqual(const clang::CodeGen::TBAAPathTag &LHS,
+                      const clang::CodeGen::TBAAPathTag &RHS) {
+    return LHS.BaseT == RHS.BaseT &&
+           LHS.AccessN == RHS.AccessN &&
+           LHS.Offset == RHS.Offset;
+  }
+};
+
+}  // end namespace llvm
+
 #endif
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp	(revision 178718)
+++ lib/Driver/Tools.cpp	(working copy)
@@ -2105,6 +2105,8 @@
                     options::OPT_fno_strict_aliasing,
                     getToolChain().IsStrictAliasingDefault()))
     CmdArgs.push_back("-relaxed-aliasing");
+  if (Args.hasArg(options::OPT_fstruct_path_tbaa))
+    CmdArgs.push_back("-struct-path-tbaa");
   if (Args.hasFlag(options::OPT_fstrict_enums, options::OPT_fno_strict_enums,
                    false))
     CmdArgs.push_back("-fstrict-enums");
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp	(revision 178718)
+++ lib/Frontend/CompilerInvocation.cpp	(working copy)
@@ -324,6 +324,7 @@
   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
     OPT_fuse_register_sized_bitfield_access);
   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
+  Opts.StructPathTBAA = Args.hasArg(OPT_struct_path_tbaa);
   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
   Opts.NoCommon = Args.hasArg(OPT_fno_common);
Index: test/CodeGen/tbaa.cpp
===================================================================
--- test/CodeGen/tbaa.cpp	(revision 0)
+++ test/CodeGen/tbaa.cpp	(working copy)
@@ -0,0 +1,217 @@
+// RUN: %clang_cc1 -O1 -disable-llvm-optzns %s -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 -O1 -struct-path-tbaa -disable-llvm-optzns %s -emit-llvm -o - | FileCheck %s -check-prefix=PATH
+// Test TBAA metadata generated by front-end.
+
+#include <stdint.h>
+typedef struct
+{
+   uint16_t f16;
+   uint32_t f32;
+   uint16_t f16_2;
+   uint32_t f32_2;
+} StructA;
+typedef struct
+{
+   uint16_t f16;
+   StructA a;
+   uint32_t f32;
+} StructB;
+typedef struct
+{
+   uint16_t f16;
+   StructB b;
+   uint32_t f32;
+} StructC;
+typedef struct
+{
+   uint16_t f16;
+   StructB b;
+   uint32_t f32;
+   uint8_t f8;
+} StructD;
+
+typedef struct
+{
+   uint16_t f16;
+   uint32_t f32;
+} StructS;
+typedef struct
+{
+   uint16_t f16;
+   uint32_t f32;
+} StructS2;
+
+uint32_t g(uint32_t *s, StructA *A, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !5
+  *s = 1;
+  A->f32 = 4;
+  return *s;
+}
+
+uint32_t g2(uint32_t *s, StructA *A, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa !8
+  *s = 1;
+  A->f16 = 4;
+  return *s;
+}
+
+uint32_t g3(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !5
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !9
+  A->f32 = 1;
+  B->a.f32 = 4;
+  return A->f32;
+}
+
+uint32_t g4(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !5
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa !11
+  A->f32 = 1;
+  B->a.f16 = 4;
+  return A->f32;
+}
+
+uint32_t g5(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !5
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !12
+  A->f32 = 1;
+  B->f32 = 4;
+  return A->f32;
+}
+
+uint32_t g6(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !5
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !13
+  A->f32 = 1;
+  B->a.f32_2 = 4;
+  return A->f32;
+}
+
+uint32_t g7(StructA *A, StructS *S, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !5
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !14
+  A->f32 = 1;
+  S->f32 = 4;
+  return A->f32;
+}
+
+uint32_t g8(StructA *A, StructS *S, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !5
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa !16
+  A->f32 = 1;
+  S->f16 = 4;
+  return A->f32;
+}
+
+uint32_t g9(StructS *S, StructS2 *S2, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !14
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !17
+  S->f32 = 1;
+  S2->f32 = 4;
+  return S->f32;
+}
+
+uint32_t g10(StructS *S, StructS2 *S2, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !14
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa !19
+  S->f32 = 1;
+  S2->f16 = 4;
+  return S->f32;
+}
+
+uint32_t g11(StructC *C, StructD *D, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !20
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !22
+  C->b.a.f32 = 1;
+  D->b.a.f32 = 4;
+  return C->b.a.f32;
+}
+
+uint32_t g12(StructC *C, StructD *D, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// TODO: differentiate the two accesses.
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa !9
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa !9
+  StructB *b1 = &(C->b);
+  StructB *b2 = &(D->b);
+  // b1, b2 have different context.
+  b1->a.f32 = 1;
+  b2->a.f32 = 4;
+  return b1->a.f32;
+}
+
+// CHECK: !1 = metadata !{metadata !"omnipotent char", metadata !2}
+// CHECK: !2 = metadata !{metadata !"Simple C/C++ TBAA"}
+// CHECK: !4 = metadata !{metadata !"int", metadata !1}
+// CHECK: !5 = metadata !{metadata !"short", metadata !1}
+
+// PATH: !1 = metadata !{metadata !"omnipotent char", metadata !2}
+// PATH: !4 = metadata !{metadata !"int", metadata !1}
+// PATH: !5 = metadata !{metadata !6, metadata !4, i64 4}
+// PATH: !6 = metadata !{metadata !"_ZTS7StructA", i64 0, metadata !7, i64 4, metadata !4}
+// PATH: !7 = metadata !{metadata !"short", metadata !1}
+// PATH: !8 = metadata !{metadata !6, metadata !7, i64 0}
+// PATH: !9 = metadata !{metadata !10, metadata !4, i64 8}
+// PATH: !10 = metadata !{metadata !"_ZTS7StructB", i64 0, metadata !7, i64 4, metadata !6, i64 20, metadata !4}
+// PATH: !11 = metadata !{metadata !10, metadata !7, i64 4}
+// PATH: !12 = metadata !{metadata !10, metadata !4, i64 20}
+// PATH: !13 = metadata !{metadata !10, metadata !4, i64 16}
+// PATH: !14 = metadata !{metadata !15, metadata !4, i64 4}
+// PATH: !15 = metadata !{metadata !"_ZTS7StructS", i64 0, metadata !7, i64 4, metadata !4}
+// PATH: !16 = metadata !{metadata !15, metadata !7, i64 0}
+// PATH: !17 = metadata !{metadata !18, metadata !4, i64 4}
+// PATH: !18 = metadata !{metadata !"_ZTS8StructS2", i64 0, metadata !7, i64 4, metadata !4}
+// PATH: !19 = metadata !{metadata !18, metadata !7, i64 0}
+// PATH: !20 = metadata !{metadata !21, metadata !4, i64 12}
+// PATH: !21 = metadata !{metadata !"_ZTS7StructC", i64 0, metadata !7, i64 4, metadata !10, i64 28, metadata !4}
+// PATH: !22 = metadata !{metadata !23, metadata !4, i64 12}
+// PATH: !23 = metadata !{metadata !"_ZTS7StructD", i64 0, metadata !7, i64 4, metadata !10, i64 28, metadata !4, i64 32, metadata !1}

llvm-svn: 178784
 2013-04-04 20:14:17 +00:00
Rafael Espindola 6ae7e50be4 Add 178663 back. 
http://lab.llvm.org:8011/builders/clang-x86_64-darwin10-gdb went back green
before it processed the reverted 178663, so it could not have been the culprit.

Revert "Revert 178663."

This reverts commit 4f8a3eb2ce5d4ba422483439e20c8cbb4d953a41.

llvm-svn: 178682
 2013-04-03 19:27:57 +00:00
Rafael Espindola 985a3abee4 Revert 178663. 
Looks like it broke http://lab.llvm.org:8011/builders/clang-x86_64-darwin10-gdb

Revert "Don't compute a patched/semantic storage class."

This reverts commit 8f187f62cb0487d31bc4afdfcd47e11fe9a51d05.

llvm-svn: 178681
 2013-04-03 19:22:20 +00:00
Rafael Espindola adea16bd9e Don't compute a patched/semantic storage class. 
For variables and functions clang used to store two storage classes. The one
"as written" in the code and a patched one, which, for example, propagates
static to the following decls.

This apparently is from the days clang lacked linkage computation. It is now
redundant and this patch removes it.

llvm-svn: 178663
 2013-04-03 15:50:00 +00:00
Nadav Rotem 1da30944a6 Make clang to mark static stack allocations with lifetime markers to enable a more aggressive stack coloring. 
Patch by John McCall with help by Shuxin Yang.
rdar://13115369

llvm-svn: 177819
 2013-03-23 06:43:35 +00:00
Rafael Espindola 513499d0ad Don't try to set attributes in alias, they have none. 
llvm-svn: 177402
 2013-03-19 15:03:47 +00:00
Alexey Samsonov a1c0a2a2c6 [Sanitize] Don't emit function attribute sanitize_address/thread/memory if the function is blacklisted. 
llvm-svn: 176550
 2013-03-06 10:54:18 +00:00
John McCall 882987f30c Use the actual ABI-determined C calling convention for runtime 
calls and declarations.

LLVM has a default CC determined by the target triple.  This is
not always the actual default CC for the ABI we've been asked to
target, and so we sometimes find ourselves annotating all user
functions with an explicit calling convention.  Since these
calling conventions usually agree for the simple set of argument
types passed to most runtime functions, using the LLVM-default CC
in principle has no effect.  However, the LLVM optimizer goes
into histrionics if it sees this kind of formal CC mismatch,
since it has no concept of CC compatibility.  Therefore, if this
module happens to define the "runtime" function, or got LTO'ed
with such a definition, we can miscompile;  so it's quite
important to get this right.

Defining runtime functions locally is quite common in embedded
applications.

llvm-svn: 176286
 2013-02-28 19:01:20 +00:00
Rafael Espindola 4a5da44b34 Rename methods to comply with the LLVM Coding Standards. 
llvm-svn: 176159
 2013-02-27 02:56:45 +00:00
Rafael Espindola a8fbdab850 Move LinkageInfo out of NamedDecl so that it can be used in Type.h. 
Everything that cares about visibility also cares about linkage, so I just
moved it to Visibility.h instead of creating a new .h.

llvm-svn: 176155
 2013-02-27 02:15:29 +00:00
Kostya Serebryany 4c0fc9931e Unify clang/llvm attributes for asan/tsan/msan (Clang part) 
These are two related changes (one in llvm, one in clang).
LLVM: 
- rename address_safety => sanitize_address (the enum value is the same, so we preserve binary compatibility with old bitcode)
- rename thread_safety => sanitize_thread
- rename no_uninitialized_checks -> sanitize_memory

CLANG: 
- add __attribute__((no_sanitize_address)) as a synonym for __attribute__((no_address_safety_analysis))
- add __attribute__((no_sanitize_thread))
- add __attribute__((no_sanitize_memory))

for S in address thread memory
If -fsanitize=S is present and __attribute__((no_sanitize_S)) is not
set llvm attribute sanitize_S

llvm-svn: 176076
 2013-02-26 06:58:27 +00:00
Argyrios Kyrtzidis 8a27b2b350 In Sema::InstantiateStaticDataMemberDefinition, pass the var decl to the consumer 
just using ASTConsumer::HandleCXXStaticMemberVarInstantiation(), don't pass it with
ASTConsumer::HandleTopLevelDecl.

ASTConsumer::HandleTopLevelDecl is intended for user-written top-level decls;
a consumer can treat an instantiated static data member however it wants of course.

llvm-svn: 175976
 2013-02-24 00:05:01 +00:00
Michael Han 84324357b8 [Sema] Semantic analysis for empty-declaration and attribute-declaration. 
Introduce a new AST Decl node "EmptyDecl" to model empty-declaration. Have attributes from attribute-declaration appertain
to the EmptyDecl node by creating the AST representations of these attributes and attach them to the EmptyDecl node so these
attributes can be sema checked just as attributes attached to "normal" declarations.

llvm-svn: 175900
 2013-02-22 17:15:32 +00:00
Bill Wendling f4d64cb3a5 Apply the 'nobuiltin' attribute to call sites when the user specifies `-fno-builtin' on the command line. 
llvm-svn: 175836
 2013-02-22 00:13:35 +00:00