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Author SHA1 Message Date
Evgeniy Stepanov aa84f050fc [safestack] Fix assertion failure in stack coloring. 
This is a fix for PR30318.

Clang may generate IR where an alloca is already live when entering a
BB with lifetime.start. In this case, conservatively extend the
alloca lifetime all the way back to the block entry.

llvm-svn: 281784
 2016-09-16 22:04:10 +00:00
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