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307a6447e5
There is no need to calculate the liveness information for stackmaps. The liveness information is still available for the patchpoint intrinsic and that is also the intended usage model. Related to <rdar://problem/17473725> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211816 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
//===--- StackMapLivenessAnalysis - StackMap Liveness Analysis --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass calculates the liveness for each basic block in a function and
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// attaches the register live-out information to a patchpoint intrinsic (if
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// present).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
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#define LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
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#include "llvm/CodeGen/LivePhysRegs.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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namespace llvm {
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/// \brief This pass calculates the liveness information for each basic block in
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/// a function and attaches the register live-out information to a patchpoint
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/// intrinsic if present.
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///
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/// This is an optional pass that has to be explicitly enabled via the
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/// -enable-patchpoint-liveness flag. The pass skips functions that don't have
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/// any patchpoint intrinsics. The information provided by this pass is optional
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/// and not required by the aformentioned intrinsic to function.
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class StackMapLiveness : public MachineFunctionPass {
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MachineFunction *MF;
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const TargetRegisterInfo *TRI;
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LivePhysRegs LiveRegs;
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public:
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static char ID;
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/// \brief Default construct and initialize the pass.
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StackMapLiveness();
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/// \brief Tell the pass manager which passes we depend on and what
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/// information we preserve.
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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/// \brief Calculate the liveness information for the given machine function.
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bool runOnMachineFunction(MachineFunction &MF) override;
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private:
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/// \brief Performs the actual liveness calculation for the function.
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bool calculateLiveness();
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/// \brief Add the current register live set to the instruction.
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void addLiveOutSetToMI(MachineInstr &MI);
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/// \brief Create a register mask and initialize it with the registers from
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/// the register live set.
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uint32_t *createRegisterMask() const;
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};
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} // llvm namespace
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#endif // LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
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