1 // WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- C++ -*-
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// This file declares WebAssembly-specific per-machine-function
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
17 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
19 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
24 /// This class is derived from MachineFunctionInfo and contains private
25 /// WebAssembly-specific information for each MachineFunction.
26 class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
29 std::vector<MVT> Params;
30 std::vector<MVT> Results;
31 std::vector<MVT> Locals;
33 /// A mapping from CodeGen vreg index to WebAssembly register number.
34 std::vector<unsigned> WARegs;
36 /// A mapping from CodeGen vreg index to a boolean value indicating whether
37 /// the given register is considered to be "stackified", meaning it has been
38 /// determined or made to meet the stack requirements:
39 /// - single use (per path)
40 /// - single def (per path)
41 /// - defined and used in LIFO order with other stack registers
42 BitVector VRegStackified;
44 // A virtual register holding the pointer to the vararg buffer for vararg
45 // functions. It is created and set in TLI::LowerFormalArguments and read by
47 unsigned VarargVreg = -1U;
49 // A virtual register holding the base pointer for functions that have
50 // overaligned values on the user stack.
51 unsigned BasePtrVreg = -1U;
54 explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
55 ~WebAssemblyFunctionInfo() override;
57 void addParam(MVT VT) { Params.push_back(VT); }
58 const std::vector<MVT> &getParams() const { return Params; }
60 void addResult(MVT VT) { Results.push_back(VT); }
61 const std::vector<MVT> &getResults() const { return Results; }
63 void clearParamsAndResults() { Params.clear(); Results.clear(); }
65 void setNumLocals(size_t NumLocals) { Locals.resize(NumLocals, MVT::i32); }
66 void setLocal(size_t i, MVT VT) { Locals[i] = VT; }
67 void addLocal(MVT VT) { Locals.push_back(VT); }
68 const std::vector<MVT> &getLocals() const { return Locals; }
70 unsigned getVarargBufferVreg() const {
71 assert(VarargVreg != -1U && "Vararg vreg hasn't been set");
74 void setVarargBufferVreg(unsigned Reg) { VarargVreg = Reg; }
76 unsigned getBasePointerVreg() const {
77 assert(BasePtrVreg != -1U && "Base ptr vreg hasn't been set");
80 void setBasePointerVreg(unsigned Reg) { BasePtrVreg = Reg; }
82 static const unsigned UnusedReg = -1u;
84 void stackifyVReg(unsigned VReg) {
85 assert(MF.getRegInfo().getUniqueVRegDef(VReg));
86 auto I = TargetRegisterInfo::virtReg2Index(VReg);
87 if (I >= VRegStackified.size())
88 VRegStackified.resize(I + 1);
89 VRegStackified.set(I);
91 bool isVRegStackified(unsigned VReg) const {
92 auto I = TargetRegisterInfo::virtReg2Index(VReg);
93 if (I >= VRegStackified.size())
95 return VRegStackified.test(I);
99 void setWAReg(unsigned VReg, unsigned WAReg) {
100 assert(WAReg != UnusedReg);
101 auto I = TargetRegisterInfo::virtReg2Index(VReg);
102 assert(I < WARegs.size());
105 unsigned getWAReg(unsigned VReg) const {
106 auto I = TargetRegisterInfo::virtReg2Index(VReg);
107 assert(I < WARegs.size());
111 // For a given stackified WAReg, return the id number to print with push/pop.
112 static unsigned getWARegStackId(unsigned Reg) {
113 assert(Reg & INT32_MIN);
114 return Reg & INT32_MAX;
118 void ComputeLegalValueVTs(const Function &F, const TargetMachine &TM,
119 Type *Ty, SmallVectorImpl<MVT> &ValueVTs);
121 void ComputeSignatureVTs(const Function &F, const TargetMachine &TM,
122 SmallVectorImpl<MVT> &Params,
123 SmallVectorImpl<MVT> &Results);
125 } // end namespace llvm