diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/CodeGen/MachineFrameInfo.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h index 8b958e437e..78898a4a69 100644 --- a/include/llvm/CodeGen/MachineFrameInfo.h +++ b/include/llvm/CodeGen/MachineFrameInfo.h @@ -215,6 +215,10 @@ class MachineFrameInfo { /// just allocate them normally. bool UseLocalStackAllocationBlock; + /// After the stack pointer has been restore from the base pointer we + /// use a cached adjusment. Currently only used for x86. + int64_t BPAdj; + public: explicit MachineFrameInfo(const TargetFrameLowering &tfi) : TFI(tfi) { StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0; @@ -230,6 +234,7 @@ public: LocalFrameSize = 0; LocalFrameMaxAlign = 0; UseLocalStackAllocationBlock = false; + BPAdj = 0; } /// hasStackObjects - Return true if there are any stack objects in this @@ -538,6 +543,16 @@ public: void setCalleeSavedInfoValid(bool v) { CSIValid = v; } + /// setBasePtrStackAdjustment - If we're restoring the stack pointer from the + /// base pointer, due to dynamic stack realignment + VLAs, we cache the + /// number of bytes initially allocated for the stack frame. In obscure + /// cases (e.g., tail calls with byval argument and no stack protector), the + /// stack gets adjusted outside of the prolog, but these shouldn't be + /// considered when restoring from the base pointer. Currently, this is only + /// needed for x86. + void setBasePtrStackAdjustment(int64_t adj) { BPAdj = adj; } + int64_t getBasePtrStackAdjustment() const { return BPAdj; } + /// getPristineRegs - Return a set of physical registers that are pristine on /// entry to the MBB. /// |