Commit Graph

306 Commits

Author SHA1 Message Date
Yuri Gorshenin 506a170d63 [asan-assembly-instrumentation] Prologue and epilogue are moved out from InstrumentMemOperand().
llvm-svn: 216869
2014-09-01 09:56:45 +00:00
Alexey Samsonov d9ad5cec0c [ASan] Use metadata to pass source-level information from Clang to ASan.
Instead of creating global variables for source locations and global names,
just create metadata nodes and strings. They will be transformed into actual
globals in the instrumentation pass (if necessary). This approach is more
flexible:
1) we don't have to ensure that our custom globals survive all the optimizations
2) if globals are discarded for some reason, we will simply ignore metadata for them
   and won't have to erase corresponding globals
3) metadata for source locations can be reused for other purposes: e.g. we may
   attach source location metadata to alloca instructions and provide better descriptions
   for stack variables in ASan error reports.

No functionality change.

llvm-svn: 214604
2014-08-02 00:35:50 +00:00
Evgeniy Stepanov 77ad86681f [asan] Support x86 REP MOVS asm instrumentation.
Patch by Yuri Gorshenin.

llvm-svn: 214395
2014-07-31 09:11:04 +00:00
Alexey Samsonov 535b6f9361 [ASan] Don't instrument load/stores with !nosanitize metadata.
This is used to avoid instrumentation of instructions added by UBSan
in Clang frontend (see r213291). This fixes PR20085.

Reviewed in http://reviews.llvm.org/D4544.

llvm-svn: 213292
2014-07-17 18:48:12 +00:00
Alexey Samsonov 62a8e0639b CHECK-LABEL-ize one test
llvm-svn: 213177
2014-07-16 18:11:31 +00:00
Alexey Samsonov 15c9669615 [ASan] Collect unmangled names of global variables in Clang to print them in error reports.
Currently ASan instrumentation pass creates a string with global name
for each instrumented global (to include global names in the error report). Global
name is already mangled at this point, and we may not be able to demangle it
at runtime (e.g. there is no __cxa_demangle on Android).

Instead, create a string with fully qualified global name in Clang, and pass it
to ASan instrumentation pass in llvm.asan.globals metadata. If there is no metadata
for some global, ASan will use the original algorithm.

This fixes https://code.google.com/p/address-sanitizer/issues/detail?id=264.

llvm-svn: 212872
2014-07-12 00:42:52 +00:00
Timur Iskhodzhanov 6de08c3dc4 Add a test case for r212596
llvm-svn: 212828
2014-07-11 16:32:53 +00:00
Evgeniy Stepanov 6fa6c677cc [asan] Generate asm instrumentation in MC.
Generate entire ASan asm instrumentation in MC without
relying on runtime helper functions.

Patch by Yuri Gorshenin.

llvm-svn: 212455
2014-07-07 13:57:37 +00:00
Alexey Samsonov 4f319cca42 [ASan] Print exact source location of global variables in error reports.
See https://code.google.com/p/address-sanitizer/issues/detail?id=299 for the
original feature request.

Introduce llvm.asan.globals metadata, which Clang (or any other frontend)
may use to report extra information about global variables to ASan
instrumentation pass in the backend. This metadata replaces
llvm.asan.dynamically_initialized_globals that was used to detect init-order
bugs. llvm.asan.globals contains the following data for each global:
  1) source location (file/line/column info);
  2) whether it is dynamically initialized;
  3) whether it is blacklisted (shouldn't be instrumented).

Source location data is then emitted in the binary and can be picked up
by ASan runtime in case it needs to print error report involving some global.
For example:

  0x... is located 4 bytes to the right of global variable 'C::array' defined in '/path/to/file:17:8' (0x...) of size 40

These source locations are printed even if the binary doesn't have any
debug info.

This is an ABI-breaking change. ASan initialization is renamed to
__asan_init_v4(). Pre-built libraries compiled with older Clang will not work
with the fresh runtime.

llvm-svn: 212188
2014-07-02 16:54:41 +00:00
Adrian Prantl da7d92e3e2 Debug info: split out complex DIVariable address expressions into a
separate MDNode so they can be uniqued via folding set magic. To conserve
space, DIVariable nodes are still variable-length, with the last two
fields being optional.

No functional change.
http://reviews.llvm.org/D3526

llvm-svn: 212050
2014-06-30 17:17:35 +00:00
David Majnemer dad0a645a7 IR: Add COMDATs to the IR
This new IR facility allows us to represent the object-file semantic of
a COMDAT group.

COMDATs allow us to tie together sections and make the inclusion of one
dependent on another. This is required to implement features like MS
ABI VFTables and optimizing away certain kinds of initialization in C++.

This functionality is only representable in COFF and ELF, Mach-O has no
similar mechanism.

Differential Revision: http://reviews.llvm.org/D4178

llvm-svn: 211920
2014-06-27 18:19:56 +00:00
Alexey Samsonov e595e1ade0 Remove top-level Clang -fsanitize= flags for optional ASan features.
Init-order and use-after-return modes can currently be enabled
by runtime flags. use-after-scope mode is not really working at the
moment.

The only problem I see is that users won't be able to disable extra
instrumentation for init-order and use-after-scope by a top-level Clang flag.
But this instrumentation was implicitly enabled for quite a while and
we didn't hear from users hurt by it.

llvm-svn: 210924
2014-06-13 17:53:44 +00:00
Alp Toker d3d017cf00 Reduce verbiage of lit.local.cfg files
We can just split targets_to_build in one place and make it immutable.

llvm-svn: 210496
2014-06-09 22:42:55 +00:00
Evgeniy Stepanov 493df136d9 [asancov] Fix coverage line info some more.
Now it should always point to the opening brace of the function (in
-asan-coverage=1 mode).

llvm-svn: 210266
2014-06-05 14:34:45 +00:00
Evgeniy Stepanov 19f75fc947 [asan] Fix coverage instrumentation with -asan-globals=0.
llvm-svn: 210103
2014-06-03 14:16:00 +00:00
Alexey Samsonov 96e239f564 [ASan] Use llvm.global_ctors to insert init-order checking calls into ASan runtime.
Don't assume that dynamically initialized globals are all initialized from
_GLOBAL__<module_name>I_ function. Instead, scan the llvm.global_ctors and
insert poison/unpoison calls to each function there.

Patch by Nico Weber!

llvm-svn: 209780
2014-05-29 00:51:15 +00:00
Evgeniy Stepanov 386b58d056 [asancov] Don't emit extra runtime calls when compiling without coverage.
llvm-svn: 209721
2014-05-28 09:26:46 +00:00
Evgeniy Stepanov 47b1a95f1c [asancov] Emit an initializer passing number of coverage code locations in each module.
llvm-svn: 209654
2014-05-27 12:39:31 +00:00
Kostya Serebryany c7895a83d2 [asan] properly instrument memory accesses that have small alignment (smaller than min(8,size)) by making two checks instead of one. This may slowdown some cases, e.g. long long on 32-bit or wide loads produced after loop unrolling. The benefit is higher sencitivity.
llvm-svn: 209508
2014-05-23 11:52:07 +00:00
Evgeniy Stepanov aaf4bb2394 [asan] Set debug location in ASan function prologue.
Most importantly, it gives debug location info to the coverage callback.

This change also removes 2 cases of unnecessary setDebugLoc when IRBuilder
is created with the same debug location.

llvm-svn: 208767
2014-05-14 10:30:15 +00:00
Evgeniy Stepanov 9661ec0ec3 [asan] Preserve flags in asm instrumentation.
Patch by Yuri Gorshenin.

llvm-svn: 208296
2014-05-08 09:55:24 +00:00
Evgeniy Stepanov 3819f02819 [asan] Add a flag to control asm instrumentation.
With this change, asm instrumentation is disabled by default.

llvm-svn: 208167
2014-05-07 07:54:11 +00:00
Evgeniy Stepanov b6c47a5bd2 [asan] Fix instrumentation of x86 intel syntax inline assembly.
Patch by Yuri Gorshenin.

llvm-svn: 207092
2014-04-24 09:56:15 +00:00
Evgeniy Stepanov 0a951b775e Create MCTargetOptions.
For now it contains a single flag, SanitizeAddress, which enables
AddressSanitizer instrumentation of inline assembly.

Patch by Yuri Gorshenin.

llvm-svn: 206971
2014-04-23 11:16:03 +00:00
Kostya Serebryany c9a2c17ad3 [asan] Support outline instrumentation for wide types and delete dead code, patch by Yuri Gribov
llvm-svn: 206883
2014-04-22 11:19:45 +00:00
Kostya Serebryany 49b88f54da [asan] add llvm-ish test for memset/etc instrumentation
llvm-svn: 206747
2014-04-21 11:57:43 +00:00
Kostya Serebryany 22e8810838 [asan] one more workaround for PR17409: don't do BB-level coverage instrumentation if there are more than N (=1500) basic blocks. This makes ASanCoverage work on libjpeg_turbo/jchuff.c used by Chrome, which has 1824 BBs
llvm-svn: 206564
2014-04-18 08:02:42 +00:00
Kostya Serebryany 0c02d26d6b [asan] add two new hidden compile-time flags for asan: asan-instrumentation-with-call-threshold and asan-memory-access-callback-prefix. This is part of the workaround for PR17409 (instrument huge functions with callbacks instead of inlined code). These flags will also help us experiment with kasan (kernel-asan) and clang
llvm-svn: 206383
2014-04-16 12:12:19 +00:00
Alexander Potapenko 7aafd31dad [ASan] Add -asan-module to the ASan .ll tests.
After the -asan pass had been split into -asan (function-level) and -asan-module (module-level) some of the
tests have silently stopped working, because they didn't instrument the globals anymore.
We've decided to have every test using both passes, irrespective of the presence of globals in it.

llvm-svn: 204335
2014-03-20 11:16:34 +00:00
Alexander Potapenko 04969e8b31 [ASan] Do not instrument globals from the llvm.metadata section.
Fixes https://code.google.com/p/address-sanitizer/issues/detail?id=279.

llvm-svn: 204331
2014-03-20 10:48:34 +00:00
Evgeniy Stepanov 49e2625144 AddressSanitizer instrumentation for MOV and MOVAPS.
This is an initial version of *Sanitizer instrumentation of assembly code.

Patch by Yuri Gorshenin.

llvm-svn: 203908
2014-03-14 08:58:04 +00:00
Tim Northover e94a518a22 IR: add a second ordering operand to cmpxhg for failure
The syntax for "cmpxchg" should now look something like:

	cmpxchg i32* %addr, i32 42, i32 3 acquire monotonic

where the second ordering argument gives the required semantics in the case
that no exchange takes place. It should be no stronger than the first ordering
constraint and cannot be either "release" or "acq_rel" (since no store will
have taken place).

rdar://problem/15996804

llvm-svn: 203559
2014-03-11 10:48:52 +00:00
Kostya Serebryany f72bdb47bc [asan] remove test that should have been removed in r202033
llvm-svn: 202034
2014-02-24 13:44:24 +00:00
Rafael Espindola daeafb4c2a Add back r201608, r201622, r201624 and r201625
r201608 made llvm corretly handle private globals with MachO. r201622 fixed
a bug in it and r201624 and r201625 were changes for using private linkage,
assuming that llvm would do the right thing.

They all got reverted because r201608 introduced a crash in LTO. This patch
includes a fix for that. The issue was that TargetLoweringObjectFile now has
to be initialized before we can mangle names of private globals. This is
trivially true during the normal codegen pipeline (the asm printer does it),
but LTO has to do it manually.

llvm-svn: 201700
2014-02-19 17:23:20 +00:00
Rafael Espindola 2173603825 This reverts commit r201625 and r201624.
Since r201608 got reverted, it is not safe to use private linkage in these cases
until it is committed back.

llvm-svn: 201688
2014-02-19 15:49:46 +00:00
Rafael Espindola 8b27c4edc6 Now that llvm always does the right thing with private, use it.
llvm-svn: 201625
2014-02-19 02:08:39 +00:00
Kostya Serebryany 8baa386670 [asan] support for FreeBSD, LLVM part. patch by Viktor Kutuzov
llvm-svn: 201067
2014-02-10 07:37:04 +00:00
Kostya Serebryany 6e15ec1442 [asan] simplify a test
llvm-svn: 200378
2014-01-29 07:35:43 +00:00
Kostya Serebryany 714c67c31e [asan] extend asan-coverage (still experimental).
- add a mode for collecting per-block coverage (-asan-coverage=2).
   So far the implementation is naive (all blocks are instrumented),
   the performance overhead on top of asan could be as high as 30%.
 - Make sure the one-time calls to __sanitizer_cov are moved to function buttom,
   which in turn required to copy the original debug info into the call insn.

Here is the performance data on SPEC 2006
(train data, comparing asan with asan-coverage={0,1,2}):

                             asan+cov0     asan+cov1      diff 0-1    asan+cov2       diff 0-2      diff 1-2
       400.perlbench,        65.60,        65.80,         1.00,        76.20,         1.16,         1.16
           401.bzip2,        65.10,        65.50,         1.01,        75.90,         1.17,         1.16
             403.gcc,         1.64,         1.69,         1.03,         2.04,         1.24,         1.21
             429.mcf,        21.90,        22.60,         1.03,        23.20,         1.06,         1.03
           445.gobmk,       166.00,       169.00,         1.02,       205.00,         1.23,         1.21
           456.hmmer,        88.30,        87.90,         1.00,        91.00,         1.03,         1.04
           458.sjeng,       210.00,       222.00,         1.06,       258.00,         1.23,         1.16
      462.libquantum,         1.73,         1.75,         1.01,         2.11,         1.22,         1.21
         464.h264ref,       147.00,       152.00,         1.03,       160.00,         1.09,         1.05
         471.omnetpp,       115.00,       116.00,         1.01,       140.00,         1.22,         1.21
           473.astar,       133.00,       131.00,         0.98,       142.00,         1.07,         1.08
       483.xalancbmk,       118.00,       120.00,         1.02,       154.00,         1.31,         1.28
            433.milc,        19.80,        20.00,         1.01,        20.10,         1.02,         1.01
            444.namd,        16.20,        16.20,         1.00,        17.60,         1.09,         1.09
          447.dealII,        41.80,        42.20,         1.01,        43.50,         1.04,         1.03
          450.soplex,         7.51,         7.82,         1.04,         8.25,         1.10,         1.05
          453.povray,        14.00,        14.40,         1.03,        15.80,         1.13,         1.10
             470.lbm,        33.30,        34.10,         1.02,        34.10,         1.02,         1.00
         482.sphinx3,        12.40,        12.30,         0.99,        13.00,         1.05,         1.06

llvm-svn: 199488
2014-01-17 11:00:30 +00:00
Alexander Potapenko cb66fe377a [ASan] Fix the tests broken by r198018 to check for private linkage of ASan-generated globals.
llvm-svn: 198020
2013-12-25 17:06:04 +00:00
Kostya Serebryany 530e207d8a [asan] don't unpoison redzones on function exit in use-after-return mode.
Summary:
Before this change the instrumented code before Ret instructions looked like:
  <Unpoison Frame Redzones>
  if (Frame != OriginalFrame) // I.e. Frame is fake
     <Poison Complete Frame>

Now the instrumented code looks like:
  if (Frame != OriginalFrame) // I.e. Frame is fake
     <Poison Complete Frame>
  else
     <Unpoison Frame Redzones>

Reviewers: eugenis

Reviewed By: eugenis

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2458

llvm-svn: 197907
2013-12-23 14:15:08 +00:00
Kostya Serebryany 4fb7801b3f [asan] rewrite asan's stack frame layout
Summary:
Rewrite asan's stack frame layout.
First, most of the stack layout logic is moved into a separte file
to make it more testable and (potentially) useful for other projects.
Second, make the frames more compact by using adaptive redzones
(smaller for small objects, larger for large objects).
Third, try to minimized gaps due to large alignments (this is hypothetical since
today we don't see many stack vars aligned by more than 32).

The frames indeed become more compact, but I'll still need to run more benchmarks
before committing, but I am sking for review now to get early feedback.

This change will be accompanied by a trivial change in compiler-rt tests
to match the new frame sizes.

Reviewers: samsonov, dvyukov

Reviewed By: samsonov

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2324

llvm-svn: 196568
2013-12-06 09:00:17 +00:00
Manman Ren 409558f81e Debug Info: update testing cases to specify the debug info version number.
We are going to drop debug info without a version number or with a different
version number, to make sure we don't crash when we see bitcode files with
different debug info metadata format.

llvm-svn: 195504
2013-11-22 21:49:45 +00:00
Alexey Samsonov a788b940f7 [ASan] Fix PR17867 - make sure ASan doesn't crash if use-after-scope and use-after-return are combined.
llvm-svn: 195014
2013-11-18 14:53:55 +00:00
Bob Wilson da4147c743 Reapply "[asan] Poor man's coverage that works with ASan"
I was able to successfully run a bootstrapped LTO build of clang with
r194701, so this change does not seem to be the cause of our failing
buildbots.

llvm-svn: 194789
2013-11-15 07:16:09 +00:00
Bob Wilson ae73587c4b Revert "[asan] Poor man's coverage that works with ASan"
This reverts commit 194701. Apple's bootstrapped LTO builds have been failing,
and this change (along with compiler-rt 194702-194704) is the only thing on
the blamelist.  I will either reappy these changes or help debug the problem,
depending on whether this fixes the buildbots.

llvm-svn: 194780
2013-11-15 03:28:22 +00:00
Kostya Serebryany 6da3f74061 [asan] Poor man's coverage that works with ASan
llvm-svn: 194701
2013-11-14 13:27:41 +00:00
Kostya Serebryany d3d23bec66 [asan] Optimize accesses to global arrays with constant index
Summary:
Given a global array G[N], which is declared in this CU and has static initializer
avoid instrumenting accesses like G[i], where 'i' is a constant and 0<=i<N.
Also add a bit of stats.

This eliminates ~1% of instrumentations on SPEC2006
and also partially helps when asan is being run together with coverage.

Reviewers: samsonov

Reviewed By: samsonov

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1947

llvm-svn: 192794
2013-10-16 14:06:14 +00:00
Manman Ren 0ed04fc9ab TBAA: handle scalar TBAA format and struct-path aware TBAA format.
Remove the command line argument "struct-path-tbaa" since we should not depend
on command line argument to decide which format the IR file is using. Instead,
we check the first operand of the tbaa tag node, if it is a MDNode, we treat
it as struct-path aware TBAA format, otherwise, we treat it as scalar TBAA
format.

When clang starts to use struct-path aware TBAA format no matter whether
struct-path-tbaa is no, and we can auto-upgrade existing bc files, the support
for scalar TBAA format can be dropped.

Existing testing cases are updated to use the struct-path aware TBAA format.

llvm-svn: 191538
2013-09-27 18:34:27 +00:00
Manman Ren f2a88f3622 Debug Info Testing: update context from empty string to null.
Context should be either null or MDNode.

llvm-svn: 190267
2013-09-08 03:11:54 +00:00
Manman Ren deeafd8a58 Debug Info Testing: updated to use NULL instead of "i32 0" in a few fields.
Field 2 of DIType (Context), field 9 of DIDerivedType (TypeDerivedFrom),
field 12 of DICompositeType (ContainingType), fields 2, 7, 12 of DISubprogram
(Context, Type, ContainingType).

llvm-svn: 190205
2013-09-06 21:03:58 +00:00
Manman Ren 0ed70aeb85 Debug Info: add an identifier field to DICompositeType.
DICompositeType will have an identifier field at position 14. For now, the
field is set to null in DIBuilder.
For DICompositeTypes where the template argument field (the 13th field)
was optional, modify DIBuilder to make sure the template argument field is set.
Now DICompositeType has 15 fields.

Update DIBuilder to use NULL instead of "i32 0" for null value of a MDNode.
Update verifier to check that DICompositeType has 15 fields and the last
field is null or a MDString.

Update testing cases to include an extra field for DICompositeType.
The identifier field will be used by type uniquing so a front end can
genearte a DICompositeType with a unique identifer.

llvm-svn: 189282
2013-08-26 22:39:55 +00:00
Daniel Dunbar 9efbedfd35 [tests] Cleanup initialization of test suffixes.
- Instead of setting the suffixes in a bunch of places, just set one master
   list in the top-level config. We now only modify the suffix list in a few
   suites that have one particular unique suffix (.ml, .mc, .yaml, .td, .py).

 - Aside from removing the need for a bunch of lit.local.cfg files, this enables
   4 tests that were inadvertently being skipped (one in
   Transforms/BranchFolding, a .s file each in DebugInfo/AArch64 and
   CodeGen/PowerPC, and one in CodeGen/SI which is now failing and has been
   XFAILED).

 - This commit also fixes a bunch of config files to use config.root instead of
   older copy-pasted code.

llvm-svn: 188513
2013-08-16 00:37:11 +00:00
Bill Wendling 58f8cef83b Change the linkage of these global values to 'internal'.
The globals being generated here were given the 'private' linkage type. However,
this caused them to end up in different sections with the wrong prefix. E.g.,
they would be in the __TEXT,__const section with an 'L' prefix instead of an 'l'
(lowercase ell) prefix.

The problem is that the linker will eat a literal label with 'L'. If a weak
symbol is then placed into the __TEXT,__const section near that literal, then it
cannot distinguish between the literal and the weak symbol.

Part of the problems here was introduced because the address sanitizer converted
some C strings into constant initializers with trailing nuls. (Thus putting them
in the __const section with the wrong prefix.) The others were variables that
the address sanitizer created but simply had the wrong linkage type.

llvm-svn: 187827
2013-08-06 22:52:42 +00:00
Manman Ren e9a52e18da Debug Info: update testing cases to pass verifier.
llvm-svn: 187362
2013-07-29 18:12:58 +00:00
Rafael Espindola cb9afe9ad7 Current batch of -disable-debug-info-verifier.
llvm-svn: 187130
2013-07-25 17:16:05 +00:00
Kostya Serebryany 5e276f9dbc [asan] workaround for PR16277: don't instrument AllocaInstr with alignment more than the redzone size
llvm-svn: 184928
2013-06-26 09:49:52 +00:00
Kostya Serebryany 9f5213f20f [asan] add option -asan-keep-uninstrumented-functions
llvm-svn: 184927
2013-06-26 09:18:17 +00:00
David Blaikie 5692e72f30 Revert "Adding DIImportedModules to DIScopes."
This reverts commit 342d92c7a0adeabc9ab00f3f0d88d739fe7da4c7.

Turns out we're going with a different schema design to represent
DW_TAG_imported_modules so we won't need this extra field.

llvm-svn: 178215
2013-03-28 02:44:59 +00:00
David Blaikie a26d70358f Adding DIImportedModules to DIScopes.
This is just the basic groundwork for supporting DW_TAG_imported_module but I
wanted to commit this before pushing support further into Clang or LLVM so that
this rather churny change is isolated from the rest of the work. The major
churn here is obviously adding another field (within the common DIScope prefix)
to all DIScopes (files, classes, namespaces, lexical scopes, etc). This should
be the last big churny change needed for DW_TAG_imported_module/using directive
support/PR14606.

llvm-svn: 178099
2013-03-27 00:07:26 +00:00
David Blaikie cc8d090163 Remove unused field in DISubprogram
llvm-svn: 177661
2013-03-21 20:28:52 +00:00
Kostya Serebryany 10cc12f2b7 [asan] when creating string constants, set unnamed_attr and align 1 so that equal strings are merged by the linker. Observed up to 1% binary size reduction. Thanks to Anton Korobeynikov for the suggestion
llvm-svn: 177264
2013-03-18 09:38:39 +00:00
Kostya Serebryany 6b5b58deeb [asan] don't instrument functions with available_externally linkage. This saves a bit of compile time and reduces the number of redundant global strings generated by asan (https://code.google.com/p/address-sanitizer/issues/detail?id=167)
llvm-svn: 177250
2013-03-18 07:33:49 +00:00
David Blaikie 8fb8224578 Split out filename & directory from DIFile to start generalizing over DIScopes
This is the first step to making all DIScopes have a common metadata prefix (so
that things (using directives, for example) that can appear in any scope can be
added to that common prefix). DIFile is itself a DIScope so the common prefix
of all DIScopes cannot be a DIFile - instead it's the raw filename/directory
name pair.

llvm-svn: 177239
2013-03-17 21:13:55 +00:00
Alexey Samsonov 819eddc3ce [ASan] emit instrumentation for initialization order checking by default
llvm-svn: 177063
2013-03-14 12:38:58 +00:00
David Blaikie 0d221159a0 Remove the unused 4th operand for DIFile debug info metadata
llvm-svn: 176983
2013-03-13 22:05:21 +00:00
Kostya Serebryany cf880b9443 Unify clang/llvm attributes for asan/tsan/msan (LLVM 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: 176075
2013-02-26 06:58:09 +00:00
Kostya Serebryany 699ac28aa5 [asan] instrument invoke insns with noreturn attribute (as well as call insns)
llvm-svn: 175617
2013-02-20 12:35:15 +00:00
Kostya Serebryany 3ece9beaf1 [asan] instrument memory accesses with unusual sizes
This patch makes asan instrument memory accesses with unusual sizes (e.g. 5 bytes or 10 bytes), e.g. long double or
packed structures.
Instrumentation is done with two 1-byte checks
(first and last bytes) and if the error is found
__asan_report_load_n(addr, real_size) or
__asan_report_store_n(addr, real_size)
is called.

Also, call these two new functions in memset/memcpy
instrumentation.

asan-rt part will follow.

llvm-svn: 175507
2013-02-19 11:29:21 +00:00
Kostya Serebryany 7ca384bc1a [asan] revert r175266 as it breaks code with packed structures. supporting long double will require a more general solution
llvm-svn: 175442
2013-02-18 13:47:02 +00:00
Kostya Serebryany a968568165 [asan] support long double on 64-bit. See https://code.google.com/p/address-sanitizer/issues/detail?id=151
llvm-svn: 175266
2013-02-15 12:46:06 +00:00
Kostya Serebryany e2e32b32e8 [asan] fix tests for the new ABI
llvm-svn: 174959
2013-02-12 11:14:24 +00:00
Kostya Serebryany 87191f6221 [asan] adaptive redzones for globals (the larger the global the larger is the redzone)
llvm-svn: 173335
2013-01-24 10:35:40 +00:00
Alexey Samsonov 1345d35e40 ASan: wrap mapping scale and offset in a struct and make it a member of ASan passes. Add test for non-default mapping scale and offset. No functionality change
llvm-svn: 172610
2013-01-16 13:23:28 +00:00
Alexey Samsonov 29dd7f2090 [ASan] Fix lifetime intrinsics handling. Now for each intrinsic we check if it describes one of 'interesting' allocas. Assume that allocas can go through casts and phi-nodes before apperaring as llvm.lifetime arguments
llvm-svn: 171153
2012-12-27 08:50:58 +00:00
Alexey Samsonov 3d43b63a6e Improve debug info generated with enabled AddressSanitizer.
When ASan replaces <alloca instruction> with
<offset into a common large alloca>, it should also patch
llvm.dbg.declare calls and replace debug info descriptors to mark
that we've replaced alloca with a value that stores an address
of the user variable, not the user variable itself.

See PR11818 for more context.

llvm-svn: 169984
2012-12-12 14:31:53 +00:00
Alexey Samsonov 261177a1e1 ASan: add initial support for handling llvm.lifetime intrinsics in ASan - emit calls into runtime library that poison memory for local variables when their lifetime is over and unpoison memory when their lifetime begins.
llvm-svn: 169200
2012-12-04 01:34:23 +00:00
Kostya Serebryany 633bf93fb8 [asan] when checking the noreturn attribute on the call, also check it on the callee
llvm-svn: 168861
2012-11-29 08:57:20 +00:00
Kostya Serebryany dfe9e7933e [asan] Split AddressSanitizer into two passes (FunctionPass, ModulePass), LLVM part. This requires a clang part which will follow.
llvm-svn: 168781
2012-11-28 10:31:36 +00:00
Kostya Serebryany dc4cb2b736 [asan] don't instrument linker-initialized globals even with external linkage in -asan-initialization-order mode
llvm-svn: 168367
2012-11-20 13:11:32 +00:00
Kostya Serebryany b3bd605ffa [asan] make sure that linker-initialized globals (non-extern) are not instrumented even in -asan-initialization-order mode. This time with a test
llvm-svn: 168366
2012-11-20 13:00:01 +00:00
Kostya Serebryany 28d0694c27 [asan] don't instrument globals that we've created ourselves (reduces the binary size a bit)
llvm-svn: 167230
2012-11-01 13:42:40 +00:00
Kostya Serebryany 0995994989 [asan] make sure asan erases old unused allocas after it created a new one. This became important after the recent move from ModulePass to FunctionPass because no cleanup is happening after asan pass any more.
llvm-svn: 166267
2012-10-19 06:20:53 +00:00
Kostya Serebryany 19ab3d1f6a [asan] fix a test
llvm-svn: 165938
2012-10-15 14:30:30 +00:00
Sylvestre Ledru 91ce36c986 Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767
llvm-svn: 164768
2012-09-27 10:14:43 +00:00
Sylvestre Ledru 721cffd53a Fix a typo 'iff' => 'if'
llvm-svn: 164767
2012-09-27 09:59:43 +00:00
Kostya Serebryany f4be019fba [asan] add code to detect global initialization fiasco in C/C++. The sub-pass is off by default for now. Patch by Reid Watson. Note: this patch changes the interface between LLVM and compiler-rt parts of asan. The corresponding patch to compiler-rt will follow.
llvm-svn: 162268
2012-08-21 08:24:25 +00:00
Kostya Serebryany bf479714f9 [asan] insert crash basic blocks inline as opposed to inserting them at the end of the function. This doesn't seem to fix or break anything, but is considered to be more friendly to downstream passes (test change)
llvm-svn: 161871
2012-08-14 14:05:50 +00:00
Kostya Serebryany f02c6069ac [asan] make sure that the crash callbacks do not get merged (Chandler's idea: insert an empty InlineAsm). Change the order in which the new BBs are inserted: the slow path BB is insert between old BBs, the crash BB is inserted at the end. Don't create an empty BB (introduced by recent commits). Update the test. The experimental code that does manual crash callback merge will most likely be deleted later.
llvm-svn: 160544
2012-07-20 09:54:50 +00:00
Kostya Serebryany 874dae6119 [asan] refactor instrumentation to allow merging the crash callbacks (not fully implemented yet, no functionality change except the BB order)
llvm-svn: 160284
2012-07-16 16:15:40 +00:00
Chandler Carruth 8b540ab337 Revert r160254 temporarily.
It turns out that ASan relied on the at-the-end block insertion order to
(purely by happenstance) disable some LLVM optimizations, which in turn
start firing when the ordering is made more "normal". These
optimizations in turn merge many of the instrumentation reporting calls
which breaks the return address based error reporting in ASan.

We're looking at several different options for fixing this.

llvm-svn: 160256
2012-07-16 10:01:02 +00:00
Chandler Carruth 3dd6c81492 Teach AddressSanitizer to create basic blocks in a more natural order.
This is particularly useful to the backend code generators which try to
process things in the incoming function order.

Also, cleanup some uses of IRBuilder to be a bit simpler and more clear.

llvm-svn: 160254
2012-07-16 08:58:53 +00:00
Chandler Carruth 663943e23e Add a basic test for AddressSanitizer. This is just a bare-bones
functionality test.

In general, unless the functionality is substantially separated, we
should lump more basic testing into this file. The test running
infrastructure likes having a few test files with more comprehensive
testing within them.

llvm-svn: 160253
2012-07-16 08:56:46 +00:00
Kostya Serebryany 9024160439 [asan] instrument cmpxchg and atomicrmw
llvm-svn: 157683
2012-05-30 09:04:06 +00:00
Kostya Serebryany afbb65dee7 [asan] move x86-specific test to a separate X86 directory with a custom lit.local.cfg file
llvm-svn: 152567
2012-03-12 18:49:11 +00:00
Eli Bendersky 924f9a671d Replace all instances of dg.exp file with lit.local.cfg, since all tests are run with LIT now and now Dejagnu. dg.exp is no longer needed.
Patch reviewed by Daniel Dunbar. It will be followed by additional cleanup patches.

llvm-svn: 150664
2012-02-16 06:28:33 +00:00
Kostya Serebryany dc84eae1e0 [asan] fix asan-vs-gvn.ll test (it did not actually check much before this change)
llvm-svn: 150441
2012-02-14 00:02:35 +00:00
Kostya Serebryany 154a54d972 [asan] unpoison the stack before every noreturn call. Fixes asan issue 37. llvm part
llvm-svn: 150102
2012-02-08 21:36:17 +00:00
Kostya Serebryany 9e0d377400 The patch resolves the conflict between AddressSanitizer and load widening (GVN).
The problem initially reported by Mozilla folks (http://code.google.com/p/address-sanitizer/issues/detail?id=20),
but it also prevents us from enabling LLVM bootstrap with AddressSanitizer.

llvm-svn: 149925
2012-02-06 22:48:56 +00:00
Kostya Serebryany c11d1dd133 [asan] enable asan only for the functions that have Attribute::AddressSafety
llvm-svn: 148846
2012-01-24 19:34:43 +00:00
Kostya Serebryany 842ae27ae3 [asan] one more test for asan instrumentation: (*a)++ should be instrumented only once.
llvm-svn: 147509
2012-01-04 01:02:14 +00:00
Kostya Serebryany 561dade58d [asan] add a test for instrumenting globals
llvm-svn: 146718
2011-12-16 01:28:19 +00:00
Kostya Serebryany 8b5c7a56a3 [asan] do not instrument threadlocal globals, this is buggy
llvm-svn: 145092
2011-11-23 02:10:54 +00:00
Kostya Serebryany 1cdc6e9567 [asan] workaround for reg alloc bug 11395: don't instrument functions with large chunks of inline assembler
llvm-svn: 144962
2011-11-18 01:41:06 +00:00
Kostya Serebryany 65e2211b95 fall back to explicit list of allowed linkages when instrumenting globals in asan; add a test check that asan does not touch linkonce_odr
llvm-svn: 144933
2011-11-17 23:14:59 +00:00
Kostya Serebryany 6e6b03ec46 AddressSanitizer, first commit (compiler module only)
llvm-svn: 144758
2011-11-16 01:35:23 +00:00