blob: 6ba7256e44af615c0db335bea63b748b0f043996 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
//===--- 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 stackmap or 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 stackmap or
/// patchpoint intrinsic if present.
///
/// This is an optional pass that has to be explicitly enabled via the
/// -enable-stackmap-liveness and/or -enable-patchpoint-liveness flag. The pass
/// skips functions that don't have any stackmap or patchpoint intrinsics. The
/// information provided by this pass is optional and not required by the
/// aformentioned intrinsics 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
|
