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144 Commits

Author SHA1 Message Date
Kostya Serebryany
bd2c711cdd [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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199488 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-01-17 11:00:30 +00:00
Evgeniy Stepanov
6d49eafb00 [asan] Remove -fsanitize-address-zero-base-shadow command line 
flag from clang, and disable zero-base shadow support on all platforms
where it is not the default behavior.

- It is completely unused, as far as we know.
- It is ABI-incompatible with non-zero-base shadow, which means all
objects in a process must be built with the same setting. Failing to
do so results in a segmentation fault at runtime.
- It introduces a backward dependency of compiler-rt on user code,
which is uncommon and complicates testing.

This is the LLVM part of a larger change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199371 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-01-16 10:19:12 +00:00
Alexander Potapenko
b09f505445 [ASan] Fix the test for __asan_gen_ globals and actually fix http://llvm.org/bugs/show_bug.cgi?id=17976 
by setting the correct linkage (as stated in the bug).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198018 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-25 16:46:27 +00:00
Alexander Potapenko
c58d98777c [ASan] Make sure none of the __asan_gen_ global strings end up in the symbol table, add a test. 
This should fix http://llvm.org/bugs/show_bug.cgi?id=17976
Another test checking for the global variables' locations and prefixes on Darwin will be committed separately.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198017 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-25 14:22:15 +00:00
Kostya Serebryany
26f1d1cbbc [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197907 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-23 14:15:08 +00:00
Kostya Serebryany
1fe014e5fc [asan] produce fewer stores when poisoning stack shadow 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197904 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-23 09:24:36 +00:00
Evgeniy Stepanov
a7eb2b83ba Add an explicit insert point argument to SplitBlockAndInsertIfThen. 
Currently SplitBlockAndInsertIfThen requires that branch condition is an
Instruction itself, which is very inconvenient, because it is sometimes an
Operator, or even a Constant.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197677 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-19 13:29:56 +00:00
Reid Kleckner
0e33b4574b [asan] Fix the coverage.cc test broken by r196939 
It was failing because ASan was adding all of the following to one
function:
- dynamic alloca
- stack realignment
- inline asm

This patch avoids making the static alloca dynamic when coverage is
used.

ASan should probably not be inserting empty inline asm blobs to inhibit
duplicate tail elimination.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196973 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-10 21:49:28 +00:00
Kostya Serebryany
daa1bf3b74 [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196568 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-06 09:00:17 +00:00
Alexey Samsonov
64409ad8e3 [ASan] Fix PR17867 - make sure ASan doesn't crash if use-after-scope and use-after-return are combined. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195014 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-11-18 14:53:55 +00:00
Kostya Serebryany
8f15c68222 [asan] use GlobalValue::PrivateLinkage for coverage guard to save quite a bit of code size 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194800 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-11-15 09:52:05 +00:00
Bob Wilson
4b8991424a 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194789 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-11-15 07:16:09 +00:00
Bob Wilson
2475da80ed 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194780 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-11-15 03:28:22 +00:00
Kostya Serebryany
8cc5f7cd59 [asan] Poor man's coverage that works with ASan 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194701 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-11-14 13:27:41 +00:00
Kostya Serebryany
3386d25257 [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192794 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-10-16 14:06:14 +00:00
Rafael Espindola
8819c84aed Remove several unused variables. 
Patch by Alp Toker.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191757 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-10-01 13:32:03 +00:00
Kostya Serebryany
ac04abaf5a [asan] call __asan_stack_malloc_N only if use-after-return detection is enabled with the run-time option 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190939 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-09-18 14:07:14 +00:00
David Blaikie
0b956507ca ifndef NDEBUG-out an asserts-only constant committed in r190863 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190905 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-09-18 00:11:27 +00:00
Kostya Serebryany
671c3ba921 [asan] inline the calls to __asan_stack_free_* with small sizes. Yet another 10%-20% speedup for use-after-return 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190863 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-09-17 12:14:50 +00:00
Kostya Serebryany
f3d4b35f24 [asan] refactor the use-after-return API so that the size class is computed at compile time instead of at run-time. llvm part 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190407 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-09-10 13:16:56 +00:00
Alexey Samsonov
e39e1316f0 Add SpecialCaseList::createOrDie() factory and use it in sanitizer passes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188169 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-08-12 11:46:09 +00:00
Jakub Staszak
4c71064129 Mark obviously const methods. Also use reference for parameters when possible. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188103 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-08-09 20:53:48 +00:00
Bill Wendling
55a1a590bf 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187827 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-08-06 22:52:42 +00:00
Alexey Samsonov
48d7d1d231 80-cols 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187725 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-08-05 13:19:49 +00:00
Bill Schmidt
f38cc38fa6 [PowerPC] Support powerpc64le as a syntax-checking target. 
This patch provides basic support for powerpc64le as an LLVM target.
However, use of this target will not actually generate little-endian
code.  Instead, use of the target will cause the correct little-endian
built-in defines to be generated, so that code that tests for
__LITTLE_ENDIAN__, for example, will be correctly parsed for
syntax-only testing.  Code generation will otherwise be the same as
powerpc64 (big-endian), for now.

The patch leaves open the possibility of creating a little-endian
PowerPC64 back end, but there is no immediate intent to create such a
thing.

The LLVM portions of this patch simply add ppc64le coverage everywhere
that ppc64 coverage currently exists.  There is nothing of any import
worth testing until such time as little-endian code generation is
implemented.  In the corresponding Clang patch, there is a new test
case variant to ensure that correct built-in defines for little-endian
code are generated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187179 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-07-26 01:35:43 +00:00
Craig Topper
4172a8abba Add 'const' qualifiers to static const char* variables. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186371 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-07-16 01:17:10 +00:00
Peter Collingbourne
46e11c4c97 Implement categories for special case lists. 
A special case list can now specify categories for specific globals,
which can be used to instruct an instrumentation pass to treat certain
functions or global variables in a specific way, such as by omitting
certain aspects of instrumentation while keeping others, or informing
the instrumentation pass that a specific uninstrumentable function
has certain semantics, thus allowing the pass to instrument callers
according to those semantics.

For example, AddressSanitizer now uses the "init" category instead of
global-init prefixes for globals whose initializers should not be
instrumented, but which in all other respects should be instrumented.

The motivating use case is DataFlowSanitizer, which will have a
number of different categories for uninstrumentable functions, such
as "functional" which specifies that a function has pure functional
semantics, or "discard" which indicates that a function's return
value should not be labelled.

Differential Revision: http://llvm-reviews.chandlerc.com/D1092

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185978 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-07-09 22:03:17 +00:00
Peter Collingbourne
405515d55f Rename BlackList class to SpecialCaseList and move it to Transforms/Utils. 
Differential Revision: http://llvm-reviews.chandlerc.com/D1089

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185975 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-07-09 22:02:49 +00:00
Kostya Serebryany
d4429214a2 [asan] workaround for PR16277: don't instrument AllocaInstr with alignment more than the redzone size 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184928 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-06-26 09:49:52 +00:00
Kostya Serebryany
20985711c7 [asan] add option -asan-keep-uninstrumented-functions 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184927 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-06-26 09:18:17 +00:00
Kostya Serebryany
3e1d45bf44 [asan] ASan Linux MIPS32 support (llvm part), patch by Jyun-Yan Y 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183104 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-06-03 14:46:56 +00:00
Michael J. Spencer
c6af2432c8 Replace Count{Leading,Trailing}Zeros_{32,64} with count{Leading,Trailing}Zeros. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182680 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-05-24 22:23:49 +00:00
Bill Wendling
d02c8f4066 Remove unused #include. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182315 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-05-20 20:59:12 +00:00
Alexey Samsonov
ca825ea24d [ASan] Change the ABI of __asan_before_dynamic_init function: now it takes pointer to private string with module name. This string serves as a unique module ID in ASan runtime. LLVM part 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178013 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-26 13:05:41 +00:00
Kostya Serebryany
3016056769 [asan] Change the way we report the alloca frame on stack-buff-overflow. 
Before: the function name was stored by the compiler as a constant string
and the run-time was printing it.
Now: the PC is stored instead and the run-time prints the full symbolized frame.
This adds a couple of instructions into every function with non-empty stack frame,
but also reduces the binary size because we store less strings (I saw 2% size reduction).
This change bumps the asan ABI version to v3.

llvm part.

Example of report (now):
==31711==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffa77cf1c5 at pc 0x41feb0 bp 0x7fffa77cefb0 sp 0x7fffa77cefa8
READ of size 1 at 0x7fffa77cf1c5 thread T0
    #0 0x41feaf in Frame0(int, char*, char*, char*) stack-oob-frames.cc:20
    #1 0x41f7ff in Frame1(int, char*, char*) stack-oob-frames.cc:24
    #2 0x41f477 in Frame2(int, char*) stack-oob-frames.cc:28
    #3 0x41f194 in Frame3(int) stack-oob-frames.cc:32
    #4 0x41eee0 in main stack-oob-frames.cc:38
    #5 0x7f0c5566f76c (/lib/x86_64-linux-gnu/libc.so.6+0x2176c)
    #6 0x41eb1c (/usr/local/google/kcc/llvm_cmake/a.out+0x41eb1c)
Address 0x7fffa77cf1c5 is located in stack of thread T0 at offset 293 in frame
    #0 0x41f87f in Frame0(int, char*, char*, char*) stack-oob-frames.cc:12  <<<<<<<<<<<<<< this is new
  This frame has 6 object(s):
    [32, 36) 'frame.addr'
    [96, 104) 'a.addr'
    [160, 168) 'b.addr'
    [224, 232) 'c.addr'
    [288, 292) 's'
    [352, 360) 'd'




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177724 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-22 10:37:20 +00:00
Kostya Serebryany
5111627ac1 [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 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177264 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-18 09:38:39 +00:00
Kostya Serebryany
086a472dbe [asan] while generating the description of a global variable, emit the module name in a separate field, thus not duplicating this information if every description. This decreases the binary size (observed up to 3%). https://code.google.com/p/address-sanitizer/issues/detail?id=168 . This changes the asan API version. llvm-part 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177254 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-18 08:05:29 +00:00
Kostya Serebryany
3797adb94f [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) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177250 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-18 07:33:49 +00:00
Alexey Samsonov
b4ba5e68e1 [ASan] emit instrumentation for initialization order checking by default 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177063 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-14 12:38:58 +00:00
Kostya Serebryany
8eec41fc77 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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176075 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-26 06:58:09 +00:00
Kostya Serebryany
1479c9bb39 [asan] instrument invoke insns with noreturn attribute (as well as call insns) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175617 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-20 12:35:15 +00:00
Kostya Serebryany
6ecccdbb2b [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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175507 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-19 11:29:21 +00:00
Kostya Serebryany
605ff6655b [asan] revert r175266 as it breaks code with packed structures. supporting long double will require a more general solution 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175442 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-18 13:47:02 +00:00
Kostya Serebryany
74ecd214e2 [asan] support long double on 64-bit. See https://code.google.com/p/address-sanitizer/issues/detail?id=151 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175266 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-15 12:46:06 +00:00
Kostya Serebryany
39f02940ba [asan] fix confusing indentation 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175033 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-13 05:14:12 +00:00
Alexander Potapenko
c8a196ae8f [ASan] Do not use kDefaultShort64bitShadowOffset on Mac, where the binaries may get mapped at 0x100000000+ and thus may interleave with the shadow. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174964 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-12 12:41:12 +00:00
Kostya Serebryany
0bc55d517e [asan] change the default mapping offset on x86_64 to 0x7fff8000. This gives roughly 5% speedup. Since this is an ABI change, bump the asan ABI version by renaming __asan_init to __asan_init_v1. llvm part, compiler-rt part will follow 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174957 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-12 11:11:02 +00:00
Kostya Serebryany
117de489a0 [asan] added a flag -mllvm asan-short-64bit-mapping-offset=1 (0 by default) 
This flag makes asan use a small (<2G) offset for 64-bit asan shadow mapping.
On x86_64 this saves us a register, thus achieving ~2/3 of the
zero-base-offset's benefits in both performance and code size.

Thanks Jakub Jelinek for the idea.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174886 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-11 14:36:01 +00:00
Kostya Serebryany
29f975f8ff [asan] fix 32-bit builds 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173338 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-01-24 10:43:50 +00:00
Kostya Serebryany
63f0846f1e [asan] adaptive redzones for globals (the larger the global the larger is the redzone) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173335 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-01-24 10:35:40 +00:00