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// WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- C++ -*-
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file declares WebAssembly-specific per-machine-function
/// information.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "llvm/BinaryFormat/Wasm.h"
#include "llvm/CodeGen/MIRYamlMapping.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCSymbolWasm.h"
namespace llvm {
namespace yaml {
struct WebAssemblyFunctionInfo;
}
/// This class is derived from MachineFunctionInfo and contains private
/// WebAssembly-specific information for each MachineFunction.
class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
std::vector<MVT> Params;
std::vector<MVT> Results;
std::vector<MVT> Locals;
/// A mapping from CodeGen vreg index to WebAssembly register number.
std::vector<unsigned> WARegs;
/// A mapping from CodeGen vreg index to a boolean value indicating whether
/// the given register is considered to be "stackified", meaning it has been
/// determined or made to meet the stack requirements:
/// - single use (per path)
/// - single def (per path)
/// - defined and used in LIFO order with other stack registers
BitVector VRegStackified;
// A virtual register holding the pointer to the vararg buffer for vararg
// functions. It is created and set in TLI::LowerFormalArguments and read by
// TLI::LowerVASTART
unsigned VarargVreg = -1U;
// A virtual register holding the base pointer for functions that have
// overaligned values on the user stack.
unsigned BasePtrVreg = -1U;
// A virtual register holding the frame base. This is either FP or SP
// after it has been replaced by a vreg
unsigned FrameBaseVreg = -1U;
// The local holding the frame base. This is either FP or SP
// after WebAssemblyExplicitLocals
unsigned FrameBaseLocal = -1U;
// Function properties.
bool CFGStackified = false;
public:
explicit WebAssemblyFunctionInfo(MachineFunction &MF) {}
~WebAssemblyFunctionInfo() override;
void initializeBaseYamlFields(const yaml::WebAssemblyFunctionInfo &YamlMFI);
void addParam(MVT VT) { Params.push_back(VT); }
const std::vector<MVT> &getParams() const { return Params; }
void addResult(MVT VT) { Results.push_back(VT); }
const std::vector<MVT> &getResults() const { return Results; }
void clearParamsAndResults() {
Params.clear();
Results.clear();
}
void setNumLocals(size_t NumLocals) { Locals.resize(NumLocals, MVT::i32); }
void setLocal(size_t i, MVT VT) { Locals[i] = VT; }
void addLocal(MVT VT) { Locals.push_back(VT); }
const std::vector<MVT> &getLocals() const { return Locals; }
unsigned getVarargBufferVreg() const {
assert(VarargVreg != -1U && "Vararg vreg hasn't been set");
return VarargVreg;
}
void setVarargBufferVreg(unsigned Reg) { VarargVreg = Reg; }
unsigned getBasePointerVreg() const {
assert(BasePtrVreg != -1U && "Base ptr vreg hasn't been set");
return BasePtrVreg;
}
void setFrameBaseVreg(unsigned Reg) { FrameBaseVreg = Reg; }
unsigned getFrameBaseVreg() const {
assert(FrameBaseVreg != -1U && "Frame base vreg hasn't been set");
return FrameBaseVreg;
}
void clearFrameBaseVreg() { FrameBaseVreg = -1U; }
// Return true if the frame base physreg has been replaced by a virtual reg.
bool isFrameBaseVirtual() const { return FrameBaseVreg != -1U; }
void setFrameBaseLocal(unsigned Local) { FrameBaseLocal = Local; }
unsigned getFrameBaseLocal() const {
assert(FrameBaseLocal != -1U && "Frame base local hasn't been set");
return FrameBaseLocal;
}
void setBasePointerVreg(unsigned Reg) { BasePtrVreg = Reg; }
static const unsigned UnusedReg = -1u;
void stackifyVReg(MachineRegisterInfo &MRI, unsigned VReg) {
assert(MRI.getUniqueVRegDef(VReg));
auto I = Register::virtReg2Index(VReg);
if (I >= VRegStackified.size())
VRegStackified.resize(I + 1);
VRegStackified.set(I);
}
void unstackifyVReg(unsigned VReg) {
auto I = Register::virtReg2Index(VReg);
if (I < VRegStackified.size())
VRegStackified.reset(I);
}
bool isVRegStackified(unsigned VReg) const {
auto I = Register::virtReg2Index(VReg);
if (I >= VRegStackified.size())
return false;
return VRegStackified.test(I);
}
void initWARegs(MachineRegisterInfo &MRI);
void setWAReg(unsigned VReg, unsigned WAReg) {
assert(WAReg != UnusedReg);
auto I = Register::virtReg2Index(VReg);
assert(I < WARegs.size());
WARegs[I] = WAReg;
}
unsigned getWAReg(unsigned VReg) const {
auto I = Register::virtReg2Index(VReg);
assert(I < WARegs.size());
return WARegs[I];
}
// For a given stackified WAReg, return the id number to print with push/pop.
static unsigned getWARegStackId(unsigned Reg) {
assert(Reg & INT32_MIN);
return Reg & INT32_MAX;
}
bool isCFGStackified() const { return CFGStackified; }
void setCFGStackified(bool Value = true) { CFGStackified = Value; }
};
void computeLegalValueVTs(const Function &F, const TargetMachine &TM, Type *Ty,
SmallVectorImpl<MVT> &ValueVTs);
// Compute the signature for a given FunctionType (Ty). Note that it's not the
// signature for ContextFunc (ContextFunc is just used to get varous context)
void computeSignatureVTs(const FunctionType *Ty, const Function *TargetFunc,
const Function &ContextFunc, const TargetMachine &TM,
SmallVectorImpl<MVT> &Params,
SmallVectorImpl<MVT> &Results);
void valTypesFromMVTs(const ArrayRef<MVT> &In,
SmallVectorImpl<wasm::ValType> &Out);
std::unique_ptr<wasm::WasmSignature>
signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
const SmallVectorImpl<MVT> &Params);
namespace yaml {
struct WebAssemblyFunctionInfo final : public yaml::MachineFunctionInfo {
bool CFGStackified = false;
WebAssemblyFunctionInfo() = default;
WebAssemblyFunctionInfo(const llvm::WebAssemblyFunctionInfo &MFI);
void mappingImpl(yaml::IO &YamlIO) override;
~WebAssemblyFunctionInfo() = default;
};
template <> struct MappingTraits<WebAssemblyFunctionInfo> {
static void mapping(IO &YamlIO, WebAssemblyFunctionInfo &MFI) {
YamlIO.mapOptional("isCFGStackified", MFI.CFGStackified, false);
}
};
} // end namespace yaml
} // end namespace llvm
#endif
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