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[stackprotector] Implement the sspstrong rules for stack layout.

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This changes the PrologueEpilogInserter and LocalStackSlotAllocation passes to
follow the extended stack layout rules for sspstrong and sspreq.

The sspstrong layout rules are:
 1. Large arrays and structures containing large arrays (>= ssp-buffer-size)
are closest to the stack protector.
 2. Small arrays and structures containing small arrays (< ssp-buffer-size) are
2nd closest to the protector.
 3. Variables that have had their address taken are 3rd closest to the
protector.


Differential Revision: http://llvm-reviews.chandlerc.com/D2546


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200601 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Josh Magee
2014-02-01 01:36:16 +00:00
parent 8a24e83550
commit cde5c26c46
5 changed files with 644 additions and 4 deletions
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11
lib/CodeGen/LocalStackSlotAllocation.cpp
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@ -194,6 +194,9 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
SmallSet<int, 16> ProtectedObjs;
if (MFI->getStackProtectorIndex() >= 0) {
StackObjSet LargeArrayObjs;
StackObjSet SmallArrayObjs;
StackObjSet AddrOfObjs;
AdjustStackOffset(MFI, MFI->getStackProtectorIndex(), Offset,
StackGrowsDown, MaxAlign);
@ -206,8 +209,12 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
switch (SP->getSSPLayout(MFI->getObjectAllocation(i))) {
case StackProtector::SSPLK_None:
continue;
case StackProtector::SSPLK_SmallArray:
SmallArrayObjs.insert(i);
continue;
case StackProtector::SSPLK_AddrOf:
AddrOfObjs.insert(i);
continue;
case StackProtector::SSPLK_LargeArray:
LargeArrayObjs.insert(i);
@ -218,6 +225,10 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
AssignProtectedObjSet(LargeArrayObjs, ProtectedObjs, MFI, StackGrowsDown,
Offset, MaxAlign);
AssignProtectedObjSet(SmallArrayObjs, ProtectedObjs, MFI, StackGrowsDown,
Offset, MaxAlign);
AssignProtectedObjSet(AddrOfObjs, ProtectedObjs, MFI, StackGrowsDown,
Offset, MaxAlign);
}
// Then assign frame offsets to stack objects that are not used to spill