Commit Graph

8 Commits

Author SHA1 Message Date
Evgeniy Stepanov 906f6fb565 [safestack] Fix stack guard live range.
Stack guard slot is live throughout the function.

llvm-svn: 276712
2016-07-26 00:05:14 +00:00
Evgeniy Stepanov a5da256f92 StackColoring for SafeStack.
This is a fix for PR27842.

An IR-level implementation of stack coloring tailored to work with
SafeStack. It is a bit weaker than the MI implementation in that it
does not the "lifetime start at first access" logic. This can be
improved in the future.

This patch also replaces the naive implementation of stack frame
layout with a greedy algorithm that can split existing stack slots
and even fit small objects inside the alignment padding of other
objects.

llvm-svn: 274162
2016-06-29 20:37:43 +00:00
Matt Arsenault 5e65d79d48 Fix doubly included header
llvm-svn: 273528
2016-06-23 02:34:51 +00:00
Evgeniy Stepanov 45fa0fd758 [safestack] Sink unsafe address computation to each use.
This is a fix for PR27844.
When replacing uses of unsafe allocas, emit the new location
immediately after each use. Without this, the pointer stays live from
the function entry to the last use, while it's usually cheaper to
recalculate.

llvm-svn: 272969
2016-06-16 22:34:04 +00:00
Evgeniy Stepanov 72d961a1da [safestack] Fixup llvm.dbg.value when rewriting unsafe allocas.
When moving unsafe allocas to the unsafe stack, dbg.declare intrinsics are
updated to refer to the new location.

This change does the same to dbg.value intrinsics.

llvm-svn: 272968
2016-06-16 22:34:00 +00:00
Evgeniy Stepanov f17120a85f [safestack] Add canary to unsafe stack frames
Add StackProtector to SafeStack. This adds limited protection against
data corruption in the caller frame. Current implementation treats
all stack protector levels as -fstack-protector-all.

llvm-svn: 266004
2016-04-11 22:27:48 +00:00
Anna Zaks cad7994c3b [safestack] Make sure the unsafe stack pointer is popped in all cases
The unsafe stack pointer is only popped in moveStaticAllocasToUnsafeStack so it won't happen if there are no static allocas.

Fixes https://llvm.org/bugs/show_bug.cgi?id=26122

Differential Revision: http://reviews.llvm.org/D16339

llvm-svn: 259447
2016-02-02 01:03:11 +00:00
Benjamin Kramer 390c33cd18 Move SafeStack to CodeGen.
It depends on the target machinery, that's not available for
instrumentation passes.

llvm-svn: 258942
2016-01-27 16:53:42 +00:00