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3bf79d0e44
Currently module asm ends up emitted twice and at the wrong place in the PTX. This patch moves module asm generation into emitStartOfAsmFile() which puts at the correct location in the generated PTX. Differential Revision: https://reviews.llvm.org/D82280
312 lines
11 KiB
C++
312 lines
11 KiB
C++
//===-- NVPTXAsmPrinter.h - NVPTX LLVM assembly writer ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to NVPTX assembly language.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_NVPTX_NVPTXASMPRINTER_H
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#define LLVM_LIB_TARGET_NVPTX_NVPTXASMPRINTER_H
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#include "NVPTX.h"
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#include "NVPTXSubtarget.h"
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#include "NVPTXTargetMachine.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DebugLoc.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Value.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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#include <algorithm>
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#include <cassert>
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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// The ptx syntax and format is very different from that usually seem in a .s
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// file,
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// therefore we are not able to use the MCAsmStreamer interface here.
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//
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// We are handcrafting the output method here.
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//
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// A better approach is to clone the MCAsmStreamer to a MCPTXAsmStreamer
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// (subclass of MCStreamer).
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namespace llvm {
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class MCOperand;
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class LLVM_LIBRARY_VISIBILITY NVPTXAsmPrinter : public AsmPrinter {
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class AggBuffer {
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// Used to buffer the emitted string for initializing global
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// aggregates.
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//
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// Normally an aggregate (array, vector or structure) is emitted
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// as a u8[]. However, if one element/field of the aggregate
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// is a non-NULL address, then the aggregate is emitted as u32[]
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// or u64[].
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//
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// We first layout the aggregate in 'buffer' in bytes, except for
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// those symbol addresses. For the i-th symbol address in the
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//aggregate, its corresponding 4-byte or 8-byte elements in 'buffer'
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// are filled with 0s. symbolPosInBuffer[i-1] records its position
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// in 'buffer', and Symbols[i-1] records the Value*.
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//
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// Once we have this AggBuffer setup, we can choose how to print
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// it out.
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public:
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unsigned numSymbols; // number of symbol addresses
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private:
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const unsigned size; // size of the buffer in bytes
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std::vector<unsigned char> buffer; // the buffer
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SmallVector<unsigned, 4> symbolPosInBuffer;
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SmallVector<const Value *, 4> Symbols;
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// SymbolsBeforeStripping[i] is the original form of Symbols[i] before
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// stripping pointer casts, i.e.,
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// Symbols[i] == SymbolsBeforeStripping[i]->stripPointerCasts().
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//
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// We need to keep these values because AggBuffer::print decides whether to
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// emit a "generic()" cast for Symbols[i] depending on the address space of
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// SymbolsBeforeStripping[i].
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SmallVector<const Value *, 4> SymbolsBeforeStripping;
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unsigned curpos;
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raw_ostream &O;
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NVPTXAsmPrinter &AP;
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bool EmitGeneric;
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public:
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AggBuffer(unsigned size, raw_ostream &O, NVPTXAsmPrinter &AP)
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: size(size), buffer(size), O(O), AP(AP) {
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curpos = 0;
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numSymbols = 0;
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EmitGeneric = AP.EmitGeneric;
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}
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unsigned addBytes(unsigned char *Ptr, int Num, int Bytes) {
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assert((curpos + Num) <= size);
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assert((curpos + Bytes) <= size);
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for (int i = 0; i < Num; ++i) {
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buffer[curpos] = Ptr[i];
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curpos++;
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}
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for (int i = Num; i < Bytes; ++i) {
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buffer[curpos] = 0;
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curpos++;
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}
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return curpos;
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}
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unsigned addZeros(int Num) {
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assert((curpos + Num) <= size);
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for (int i = 0; i < Num; ++i) {
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buffer[curpos] = 0;
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curpos++;
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}
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return curpos;
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}
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void addSymbol(const Value *GVar, const Value *GVarBeforeStripping) {
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symbolPosInBuffer.push_back(curpos);
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Symbols.push_back(GVar);
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SymbolsBeforeStripping.push_back(GVarBeforeStripping);
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numSymbols++;
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}
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void print() {
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if (numSymbols == 0) {
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// print out in bytes
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for (unsigned i = 0; i < size; i++) {
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if (i)
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O << ", ";
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O << (unsigned int) buffer[i];
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}
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} else {
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// print out in 4-bytes or 8-bytes
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unsigned int pos = 0;
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unsigned int nSym = 0;
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unsigned int nextSymbolPos = symbolPosInBuffer[nSym];
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unsigned int nBytes = 4;
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if (static_cast<const NVPTXTargetMachine &>(AP.TM).is64Bit())
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nBytes = 8;
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for (pos = 0; pos < size; pos += nBytes) {
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if (pos)
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O << ", ";
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if (pos == nextSymbolPos) {
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const Value *v = Symbols[nSym];
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const Value *v0 = SymbolsBeforeStripping[nSym];
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if (const GlobalValue *GVar = dyn_cast<GlobalValue>(v)) {
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MCSymbol *Name = AP.getSymbol(GVar);
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PointerType *PTy = dyn_cast<PointerType>(v0->getType());
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bool IsNonGenericPointer = false; // Is v0 a non-generic pointer?
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if (PTy && PTy->getAddressSpace() != 0) {
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IsNonGenericPointer = true;
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}
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if (EmitGeneric && !isa<Function>(v) && !IsNonGenericPointer) {
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O << "generic(";
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Name->print(O, AP.MAI);
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O << ")";
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} else {
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Name->print(O, AP.MAI);
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}
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} else if (const ConstantExpr *CExpr = dyn_cast<ConstantExpr>(v0)) {
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const MCExpr *Expr =
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AP.lowerConstantForGV(cast<Constant>(CExpr), false);
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AP.printMCExpr(*Expr, O);
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} else
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llvm_unreachable("symbol type unknown");
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nSym++;
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if (nSym >= numSymbols)
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nextSymbolPos = size + 1;
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else
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nextSymbolPos = symbolPosInBuffer[nSym];
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} else if (nBytes == 4)
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O << *(unsigned int *)(&buffer[pos]);
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else
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O << *(unsigned long long *)(&buffer[pos]);
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}
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}
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}
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};
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friend class AggBuffer;
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private:
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StringRef getPassName() const override { return "NVPTX Assembly Printer"; }
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const Function *F;
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std::string CurrentFnName;
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void emitStartOfAsmFile(Module &M) override;
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void emitBasicBlockStart(const MachineBasicBlock &MBB) override;
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void emitFunctionEntryLabel() override;
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void emitFunctionBodyStart() override;
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void emitFunctionBodyEnd() override;
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void emitImplicitDef(const MachineInstr *MI) const override;
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void emitInstruction(const MachineInstr *) override;
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void lowerToMCInst(const MachineInstr *MI, MCInst &OutMI);
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bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
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MCOperand GetSymbolRef(const MCSymbol *Symbol);
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unsigned encodeVirtualRegister(unsigned Reg);
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void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
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const char *Modifier = nullptr);
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void printModuleLevelGV(const GlobalVariable *GVar, raw_ostream &O,
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bool = false);
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void printParamName(Function::const_arg_iterator I, int paramIndex,
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raw_ostream &O);
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void emitGlobals(const Module &M);
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void emitHeader(Module &M, raw_ostream &O, const NVPTXSubtarget &STI);
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void emitKernelFunctionDirectives(const Function &F, raw_ostream &O) const;
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void emitVirtualRegister(unsigned int vr, raw_ostream &);
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void emitFunctionParamList(const Function *, raw_ostream &O);
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void emitFunctionParamList(const MachineFunction &MF, raw_ostream &O);
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void setAndEmitFunctionVirtualRegisters(const MachineFunction &MF);
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void printReturnValStr(const Function *, raw_ostream &O);
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void printReturnValStr(const MachineFunction &MF, raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &) override;
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &) override;
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const MCExpr *lowerConstantForGV(const Constant *CV, bool ProcessingGeneric);
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void printMCExpr(const MCExpr &Expr, raw_ostream &OS);
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protected:
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bool doInitialization(Module &M) override;
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bool doFinalization(Module &M) override;
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private:
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bool GlobalsEmitted;
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// This is specific per MachineFunction.
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const MachineRegisterInfo *MRI;
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// The contents are specific for each
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// MachineFunction. But the size of the
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// array is not.
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typedef DenseMap<unsigned, unsigned> VRegMap;
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typedef DenseMap<const TargetRegisterClass *, VRegMap> VRegRCMap;
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VRegRCMap VRegMapping;
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// List of variables demoted to a function scope.
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std::map<const Function *, std::vector<const GlobalVariable *>> localDecls;
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void emitPTXGlobalVariable(const GlobalVariable *GVar, raw_ostream &O);
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void emitPTXAddressSpace(unsigned int AddressSpace, raw_ostream &O) const;
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std::string getPTXFundamentalTypeStr(Type *Ty, bool = true) const;
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void printScalarConstant(const Constant *CPV, raw_ostream &O);
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void printFPConstant(const ConstantFP *Fp, raw_ostream &O);
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void bufferLEByte(const Constant *CPV, int Bytes, AggBuffer *aggBuffer);
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void bufferAggregateConstant(const Constant *CV, AggBuffer *aggBuffer);
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void emitLinkageDirective(const GlobalValue *V, raw_ostream &O);
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void emitDeclarations(const Module &, raw_ostream &O);
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void emitDeclaration(const Function *, raw_ostream &O);
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void emitDemotedVars(const Function *, raw_ostream &);
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bool lowerImageHandleOperand(const MachineInstr *MI, unsigned OpNo,
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MCOperand &MCOp);
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void lowerImageHandleSymbol(unsigned Index, MCOperand &MCOp);
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bool isLoopHeaderOfNoUnroll(const MachineBasicBlock &MBB) const;
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// Used to control the need to emit .generic() in the initializer of
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// module scope variables.
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// Although ptx supports the hybrid mode like the following,
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// .global .u32 a;
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// .global .u32 b;
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// .global .u32 addr[] = {a, generic(b)}
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// we have difficulty representing the difference in the NVVM IR.
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//
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// Since the address value should always be generic in CUDA C and always
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// be specific in OpenCL, we use this simple control here.
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//
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bool EmitGeneric;
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public:
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NVPTXAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)),
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EmitGeneric(static_cast<NVPTXTargetMachine &>(TM).getDrvInterface() ==
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NVPTX::CUDA) {}
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bool runOnMachineFunction(MachineFunction &F) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<MachineLoopInfo>();
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AsmPrinter::getAnalysisUsage(AU);
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}
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std::string getVirtualRegisterName(unsigned) const;
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const MCSymbol *getFunctionFrameSymbol() const override;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_NVPTX_NVPTXASMPRINTER_H
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