vendor/llvm/llvm-release_350-r216957

1 files changed, 64 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/StackMapLivenessAnalysis.h b/include/llvm/CodeGen/StackMapLivenessAnalysis.h
new file mode 100644
index 000000000000..6f0754616206
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+++ b/include/llvm/CodeGen/StackMapLivenessAnalysis.h
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+//===--- StackMapLivenessAnalysis - StackMap Liveness Analysis --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass calculates the liveness for each basic block in a function and
+// attaches the register live-out information to a patchpoint intrinsic (if
+// present).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
+#define LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
+
+#include "llvm/CodeGen/LivePhysRegs.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+
+
+namespace llvm {
+
+/// \brief This pass calculates the liveness information for each basic block in
+/// a function and attaches the register live-out information to a patchpoint
+/// intrinsic if present.
+///
+/// This pass can be disabled via the -enable-patchpoint-liveness=false flag.
+/// The pass skips functions that don't have any patchpoint intrinsics. The
+/// information provided by this pass is optional and not required by the
+/// aformentioned intrinsic to function.
+class StackMapLiveness : public MachineFunctionPass {
+  MachineFunction *MF;
+  const TargetRegisterInfo *TRI;
+  LivePhysRegs LiveRegs;
+public:
+  static char ID;
+
+  /// \brief Default construct and initialize the pass.
+  StackMapLiveness();
+
+  /// \brief Tell the pass manager which passes we depend on and what
+  /// information we preserve.
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+  /// \brief Calculate the liveness information for the given machine function.
+  bool runOnMachineFunction(MachineFunction &MF) override;
+
+private:
+  /// \brief Performs the actual liveness calculation for the function.
+  bool calculateLiveness();
+
+  /// \brief Add the current register live set to the instruction.
+  void addLiveOutSetToMI(MachineInstr &MI);
+
+  /// \brief Create a register mask and initialize it with the registers from
+  /// the register live set.
+  uint32_t *createRegisterMask() const;
+};
+
+} // llvm namespace
+
+#endif // LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H