139 lines
4.7 KiB
C++
139 lines
4.7 KiB
C++
// WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- 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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/// \file
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/// This file declares WebAssembly-specific per-machine-function
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/// information.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "llvm/BinaryFormat/Wasm.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/MC/MCSymbolWasm.h"
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namespace llvm {
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/// This class is derived from MachineFunctionInfo and contains private
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/// WebAssembly-specific information for each MachineFunction.
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class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
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MachineFunction &MF;
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std::vector<MVT> Params;
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std::vector<MVT> Results;
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std::vector<MVT> Locals;
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/// A mapping from CodeGen vreg index to WebAssembly register number.
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std::vector<unsigned> WARegs;
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/// A mapping from CodeGen vreg index to a boolean value indicating whether
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/// the given register is considered to be "stackified", meaning it has been
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/// determined or made to meet the stack requirements:
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/// - single use (per path)
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/// - single def (per path)
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/// - defined and used in LIFO order with other stack registers
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BitVector VRegStackified;
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// A virtual register holding the pointer to the vararg buffer for vararg
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// functions. It is created and set in TLI::LowerFormalArguments and read by
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// TLI::LowerVASTART
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unsigned VarargVreg = -1U;
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// A virtual register holding the base pointer for functions that have
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// overaligned values on the user stack.
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unsigned BasePtrVreg = -1U;
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public:
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explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
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~WebAssemblyFunctionInfo() override;
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void addParam(MVT VT) { Params.push_back(VT); }
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const std::vector<MVT> &getParams() const { return Params; }
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void addResult(MVT VT) { Results.push_back(VT); }
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const std::vector<MVT> &getResults() const { return Results; }
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void clearParamsAndResults() {
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Params.clear();
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Results.clear();
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}
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void setNumLocals(size_t NumLocals) { Locals.resize(NumLocals, MVT::i32); }
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void setLocal(size_t i, MVT VT) { Locals[i] = VT; }
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void addLocal(MVT VT) { Locals.push_back(VT); }
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const std::vector<MVT> &getLocals() const { return Locals; }
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unsigned getVarargBufferVreg() const {
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assert(VarargVreg != -1U && "Vararg vreg hasn't been set");
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return VarargVreg;
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}
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void setVarargBufferVreg(unsigned Reg) { VarargVreg = Reg; }
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unsigned getBasePointerVreg() const {
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assert(BasePtrVreg != -1U && "Base ptr vreg hasn't been set");
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return BasePtrVreg;
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}
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void setBasePointerVreg(unsigned Reg) { BasePtrVreg = Reg; }
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static const unsigned UnusedReg = -1u;
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void stackifyVReg(unsigned VReg) {
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assert(MF.getRegInfo().getUniqueVRegDef(VReg));
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auto I = TargetRegisterInfo::virtReg2Index(VReg);
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if (I >= VRegStackified.size())
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VRegStackified.resize(I + 1);
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VRegStackified.set(I);
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}
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bool isVRegStackified(unsigned VReg) const {
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auto I = TargetRegisterInfo::virtReg2Index(VReg);
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if (I >= VRegStackified.size())
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return false;
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return VRegStackified.test(I);
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}
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void initWARegs();
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void setWAReg(unsigned VReg, unsigned WAReg) {
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assert(WAReg != UnusedReg);
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auto I = TargetRegisterInfo::virtReg2Index(VReg);
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assert(I < WARegs.size());
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WARegs[I] = WAReg;
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}
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unsigned getWAReg(unsigned VReg) const {
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auto I = TargetRegisterInfo::virtReg2Index(VReg);
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assert(I < WARegs.size());
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return WARegs[I];
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}
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// For a given stackified WAReg, return the id number to print with push/pop.
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static unsigned getWARegStackId(unsigned Reg) {
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assert(Reg & INT32_MIN);
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return Reg & INT32_MAX;
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}
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};
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void ComputeLegalValueVTs(const Function &F, const TargetMachine &TM, Type *Ty,
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SmallVectorImpl<MVT> &ValueVTs);
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// Compute the signature for a given FunctionType (Ty). Note that it's not the
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// signature for F (F is just used to get varous context)
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void ComputeSignatureVTs(const FunctionType *Ty, const Function &F,
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const TargetMachine &TM, SmallVectorImpl<MVT> &Params,
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SmallVectorImpl<MVT> &Results);
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std::unique_ptr<wasm::WasmSignature>
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SignatureFromMVTs(const SmallVectorImpl<MVT> &Results,
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const SmallVectorImpl<MVT> &Params);
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} // end namespace llvm
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#endif
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