diff options
Diffstat (limited to 'contrib/llvm/include/llvm/Target/TargetFrameLowering.h')
| -rw-r--r-- | contrib/llvm/include/llvm/Target/TargetFrameLowering.h | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/contrib/llvm/include/llvm/Target/TargetFrameLowering.h b/contrib/llvm/include/llvm/Target/TargetFrameLowering.h index 0e31724..3af2227 100644 --- a/contrib/llvm/include/llvm/Target/TargetFrameLowering.h +++ b/contrib/llvm/include/llvm/Target/TargetFrameLowering.h @@ -19,6 +19,7 @@ #include <vector> namespace llvm { + class BitVector; class CalleeSavedInfo; class MachineFunction; class RegScavenger; @@ -226,13 +227,15 @@ public: return 0; } - /// processFunctionBeforeCalleeSavedScan - This method is called immediately - /// before PrologEpilogInserter scans the physical registers used to determine - /// what callee saved registers should be spilled. This method is optional. - virtual void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, - RegScavenger *RS = nullptr) const { - - } + /// This method determines which of the registers reported by + /// TargetRegisterInfo::getCalleeSavedRegs() should actually get saved. + /// The default implementation checks populates the \p SavedRegs bitset with + /// all registers which are modified in the function, targets may override + /// this function to save additional registers. + /// This method also sets up the register scavenger ensuring there is a free + /// register or a frameindex available. + virtual void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, + RegScavenger *RS = nullptr) const; /// processFunctionBeforeFrameFinalized - This method is called immediately /// before the specified function's frame layout (MF.getFrameInfo()) is |
