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34 Commits

Author SHA1 Message Date
Chris Lattner
18ba4703b0 tighten up this code. 
llvm-svn: 107670
 2010-07-06 15:59:27 +00:00
Eric Christopher
e873e9978c Fix up -fstack-protector on linux to use the segment 
registers.  Split out testcases per architecture and os
now.

Patch from Nelson Elhage.

llvm-svn: 107640
 2010-07-06 05:18:56 +00:00
Duncan Sands
2acaf3609c Uniformize the names of type predicates: rather than having isFloatTy and 
isInteger, we now have isFloatTy and isIntegerTy.  Requested by Chris!

llvm-svn: 96223
 2010-02-15 16:12:20 +00:00
Benjamin Kramer
0ba7479f2c Move remaining stuff to the isInteger predicate. 
llvm-svn: 92771
 2010-01-05 21:05:54 +00:00
Nick Lewycky
711c726c97 Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces. 
Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.

llvm-svn: 85042
 2009-10-25 06:33:48 +00:00
Bill Wendling
283fb69c0a Neuter stack protectors by only checking character arrays. This is what GCC 
does.

llvm-svn: 84916
 2009-10-23 00:01:05 +00:00
Owen Anderson
9df206d02d Push LLVMContexts through the IntegerType APIs. 
llvm-svn: 78948
 2009-08-13 21:58:54 +00:00
Owen Anderson
4483fbda5e Revert yesterday's change by removing the LLVMContext parameter to AllocaInst and MallocInst. 
llvm-svn: 75863
 2009-07-15 23:53:25 +00:00
Owen Anderson
8c85061ee6 Move EVER MORE stuff over to LLVMContext. 
llvm-svn: 75703
 2009-07-14 23:09:55 +00:00
Owen Anderson
49226b1075 This started as a small change, I swear. Unfortunately, lots of things call the [I|F]CmpInst constructors. Who knew!? 
llvm-svn: 75200
 2009-07-09 23:48:35 +00:00
Duncan Sands
f7af13b2d4 Rename PaddedSize to AllocSize, in the hope that this 
will make it more obvious what it represents, and stop
it being confused with the StoreSize.

llvm-svn: 71349
 2009-05-09 07:06:46 +00:00
Bill Wendling
5ddde1a24c When we split a basic block, there's a default branch to the newly created BB. 
Delete this default branch, because we're going to generate our own.

llvm-svn: 66234
 2009-03-06 01:41:15 +00:00
Duncan Sands
bcdbfb63dc Rename getABITypeSize to getTypePaddedSize, as 
suggested by Chris.

llvm-svn: 62099
 2009-01-12 20:38:59 +00:00
Bill Wendling
3460a79979 Rename stackprotector_create intrinsic to stackprotector. 
llvm-svn: 59519
 2008-11-18 11:01:33 +00:00
Bill Wendling
485d094231 Remove the stackprotector_check intrinsic. Use a volatile load instead. 
llvm-svn: 59504
 2008-11-18 07:30:57 +00:00
Bill Wendling
3a50ecd70f - Use "moveAfter" instead of "remove/insert" of a basic block. 
- Use less indentation in coding.
- Shorten description.
- Update comments.
- Move code around

llvm-svn: 59496
 2008-11-18 05:32:11 +00:00
Bill Wendling
f5b264a64b Implement stack protectors as function attributes: "ssp" and "sspreq". 
llvm-svn: 59202
 2008-11-13 01:02:14 +00:00
Bill Wendling
d3c149eb90 Small simplification. Use the iterator already present as the insertion point. 
llvm-svn: 59008
 2008-11-10 23:38:59 +00:00
Bill Wendling
0421da9e9e - Make sure that we don't over-increment the iterator when going through the 
basic blocks.
- Minor code clean-up.

llvm-svn: 59002
 2008-11-10 21:13:10 +00:00
Bill Wendling
3fe9fef0da - Modify the stack protector algorithm so that the stack slot is allocated in 
LLVM IR code and not in the selection DAG ISel. This is a cleaner solution.

- Fix the heuristic for determining if protectors are necessary. The previous
  one wasn't checking the proper type size.

llvm-svn: 58824
 2008-11-07 01:23:58 +00:00
Bill Wendling
54a5c87823 Remove unneeded header file. 
llvm-svn: 58823
 2008-11-06 23:56:59 +00:00
Bill Wendling
70e06738b4 Don't build a vector of returns. Just modify the Function in the loop. 
llvm-svn: 58822
 2008-11-06 23:55:49 +00:00
Bill Wendling
1e6576e1e0 The size limit is for individual arrays. So if any array has more than 8 bytes 
in it, then emit stack protectors.

llvm-svn: 58819
 2008-11-06 22:18:44 +00:00
Bill Wendling
b6e2d60e7a - Rename stackprotector_{prologue,epilogue} to stackprotector_{create,check}. 
- Get rid of "HasStackProtector" in MachineFrameInfo.
- Modify intrinsics to tell which are doing what with memory.

llvm-svn: 58799
 2008-11-06 07:23:03 +00:00
Bill Wendling
489791a127 Adjust the stack protector heuristic to care about only arrays or calls to 
"alloca".

llvm-svn: 58792
 2008-11-06 02:38:58 +00:00
Bill Wendling
08905ed703 Implement the stack protector stack accesses via intrinsics: 
- stackprotector_prologue creates a stack object and stores the guard there.

- stackprotector_epilogue reads the stack guard from the stack position created
  by stackprotector_prologue.

- The PrologEpilogInserter was changed to make sure that the stack guard is
  first on the stack frame.

llvm-svn: 58791
 2008-11-06 02:29:10 +00:00
Bill Wendling
986e386794 Remove dead variable. 
llvm-svn: 58741
 2008-11-05 00:56:35 +00:00
Bill Wendling
8c86d20576 Simplify the allocated size calculation. 
llvm-svn: 58740
 2008-11-05 00:54:27 +00:00
Bill Wendling
2461aaa183 Fix comment 
llvm-svn: 58739
 2008-11-05 00:46:15 +00:00
Bill Wendling
e73f31f526 Some code simplification. It now doesn't generate a prologue if the epilogue 
isn't going to be generated.

llvm-svn: 58734
 2008-11-05 00:00:21 +00:00
Bill Wendling
214f515922 Small simplification of the stack guard type. 
llvm-svn: 58728
 2008-11-04 22:54:43 +00:00
Bill Wendling
79a8798e07 - Add a "getOrInsertGlobal" method to the Module class. This acts similarly to 
"getOrInsertFunction" in that it either adds a new declaration of the global
  and returns it, or returns the current one -- optionally casting it to the
  correct type.
- Use the new getOrInsertGlobal in the stack protector code.
- Use "splitBasicBlock" in the stack protector code.

llvm-svn: 58727
 2008-11-04 22:51:24 +00:00
Bill Wendling
ae168b2c83 Update in response to feedback from Chris: 
- Use enums instead of magic numbers.

- Rework algorithm to use the bytes size from the target to determine when to
  emit stack protectors.

- Get rid of "propolice" in any comments.

- Renamed an option to its expanded form.

- Other miscellanenous changes.

More changes will come after this.

llvm-svn: 58723
 2008-11-04 21:53:09 +00:00
Bill Wendling
0f3f36688b Initial checkin for stack protectors. Here's what it does: 
* The prologue is modified to read the __stack_chk_guard global and insert it
  onto the stack.

* The epilogue is modified to read the stored guard from the stack and compare
  it to the original __stack_chk_guard value. If they differ, then the
  __stack_chk_fail() function is called.

* The stack protector needs to be first on the stack (after the parameters) to
  catch any stack-smashing activities.

Front-end support will follow after a round of beta testing.

llvm-svn: 58673
 2008-11-04 02:10:20 +00:00