536 lines
20 KiB
C++
536 lines
20 KiB
C++
//===- AMDGPUEmitPrintf.cpp -----------------------------------------------===//
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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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// Utility function to lower a printf call into a series of device
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// library calls on the AMDGPU target.
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//
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// WARNING: This file knows about certain library functions. It recognizes them
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// by name, and hardwires knowledge of their semantics.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/AMDGPUEmitPrintf.h"
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#include "llvm/ADT/SparseBitVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/Support/DataExtractor.h"
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#include "llvm/Support/MD5.h"
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#include "llvm/Support/MathExtras.h"
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using namespace llvm;
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#define DEBUG_TYPE "amdgpu-emit-printf"
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static Value *fitArgInto64Bits(IRBuilder<> &Builder, Value *Arg) {
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auto Int64Ty = Builder.getInt64Ty();
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auto Ty = Arg->getType();
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if (auto IntTy = dyn_cast<IntegerType>(Ty)) {
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switch (IntTy->getBitWidth()) {
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case 32:
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return Builder.CreateZExt(Arg, Int64Ty);
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case 64:
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return Arg;
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}
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}
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if (Ty->getTypeID() == Type::DoubleTyID) {
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return Builder.CreateBitCast(Arg, Int64Ty);
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}
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if (isa<PointerType>(Ty)) {
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return Builder.CreatePtrToInt(Arg, Int64Ty);
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}
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llvm_unreachable("unexpected type");
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}
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static Value *callPrintfBegin(IRBuilder<> &Builder, Value *Version) {
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auto Int64Ty = Builder.getInt64Ty();
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auto M = Builder.GetInsertBlock()->getModule();
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auto Fn = M->getOrInsertFunction("__ockl_printf_begin", Int64Ty, Int64Ty);
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return Builder.CreateCall(Fn, Version);
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}
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static Value *callAppendArgs(IRBuilder<> &Builder, Value *Desc, int NumArgs,
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Value *Arg0, Value *Arg1, Value *Arg2, Value *Arg3,
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Value *Arg4, Value *Arg5, Value *Arg6,
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bool IsLast) {
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auto Int64Ty = Builder.getInt64Ty();
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auto Int32Ty = Builder.getInt32Ty();
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auto M = Builder.GetInsertBlock()->getModule();
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auto Fn = M->getOrInsertFunction("__ockl_printf_append_args", Int64Ty,
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Int64Ty, Int32Ty, Int64Ty, Int64Ty, Int64Ty,
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Int64Ty, Int64Ty, Int64Ty, Int64Ty, Int32Ty);
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auto IsLastValue = Builder.getInt32(IsLast);
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auto NumArgsValue = Builder.getInt32(NumArgs);
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return Builder.CreateCall(Fn, {Desc, NumArgsValue, Arg0, Arg1, Arg2, Arg3,
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Arg4, Arg5, Arg6, IsLastValue});
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}
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static Value *appendArg(IRBuilder<> &Builder, Value *Desc, Value *Arg,
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bool IsLast) {
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auto Arg0 = fitArgInto64Bits(Builder, Arg);
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auto Zero = Builder.getInt64(0);
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return callAppendArgs(Builder, Desc, 1, Arg0, Zero, Zero, Zero, Zero, Zero,
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Zero, IsLast);
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}
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// The device library does not provide strlen, so we build our own loop
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// here. While we are at it, we also include the terminating null in the length.
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static Value *getStrlenWithNull(IRBuilder<> &Builder, Value *Str) {
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auto *Prev = Builder.GetInsertBlock();
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Module *M = Prev->getModule();
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auto CharZero = Builder.getInt8(0);
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auto One = Builder.getInt64(1);
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auto Zero = Builder.getInt64(0);
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auto Int64Ty = Builder.getInt64Ty();
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// The length is either zero for a null pointer, or the computed value for an
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// actual string. We need a join block for a phi that represents the final
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// value.
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//
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// Strictly speaking, the zero does not matter since
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// __ockl_printf_append_string_n ignores the length if the pointer is null.
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BasicBlock *Join = nullptr;
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if (Prev->getTerminator()) {
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Join = Prev->splitBasicBlock(Builder.GetInsertPoint(),
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"strlen.join");
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Prev->getTerminator()->eraseFromParent();
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} else {
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Join = BasicBlock::Create(M->getContext(), "strlen.join",
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Prev->getParent());
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}
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BasicBlock *While =
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BasicBlock::Create(M->getContext(), "strlen.while",
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Prev->getParent(), Join);
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BasicBlock *WhileDone = BasicBlock::Create(
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M->getContext(), "strlen.while.done",
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Prev->getParent(), Join);
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// Emit an early return for when the pointer is null.
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Builder.SetInsertPoint(Prev);
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auto CmpNull =
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Builder.CreateICmpEQ(Str, Constant::getNullValue(Str->getType()));
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BranchInst::Create(Join, While, CmpNull, Prev);
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// Entry to the while loop.
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Builder.SetInsertPoint(While);
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auto PtrPhi = Builder.CreatePHI(Str->getType(), 2);
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PtrPhi->addIncoming(Str, Prev);
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auto PtrNext = Builder.CreateGEP(Builder.getInt8Ty(), PtrPhi, One);
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PtrPhi->addIncoming(PtrNext, While);
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// Condition for the while loop.
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auto Data = Builder.CreateLoad(Builder.getInt8Ty(), PtrPhi);
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auto Cmp = Builder.CreateICmpEQ(Data, CharZero);
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Builder.CreateCondBr(Cmp, WhileDone, While);
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// Add one to the computed length.
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Builder.SetInsertPoint(WhileDone, WhileDone->begin());
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auto Begin = Builder.CreatePtrToInt(Str, Int64Ty);
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auto End = Builder.CreatePtrToInt(PtrPhi, Int64Ty);
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auto Len = Builder.CreateSub(End, Begin);
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Len = Builder.CreateAdd(Len, One);
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// Final join.
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BranchInst::Create(Join, WhileDone);
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Builder.SetInsertPoint(Join, Join->begin());
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auto LenPhi = Builder.CreatePHI(Len->getType(), 2);
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LenPhi->addIncoming(Len, WhileDone);
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LenPhi->addIncoming(Zero, Prev);
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return LenPhi;
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}
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static Value *callAppendStringN(IRBuilder<> &Builder, Value *Desc, Value *Str,
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Value *Length, bool isLast) {
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auto Int64Ty = Builder.getInt64Ty();
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auto PtrTy = Builder.getPtrTy();
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auto Int32Ty = Builder.getInt32Ty();
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auto M = Builder.GetInsertBlock()->getModule();
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auto Fn = M->getOrInsertFunction("__ockl_printf_append_string_n", Int64Ty,
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Int64Ty, PtrTy, Int64Ty, Int32Ty);
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auto IsLastInt32 = Builder.getInt32(isLast);
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return Builder.CreateCall(Fn, {Desc, Str, Length, IsLastInt32});
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}
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static Value *appendString(IRBuilder<> &Builder, Value *Desc, Value *Arg,
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bool IsLast) {
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auto Length = getStrlenWithNull(Builder, Arg);
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return callAppendStringN(Builder, Desc, Arg, Length, IsLast);
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}
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static Value *processArg(IRBuilder<> &Builder, Value *Desc, Value *Arg,
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bool SpecIsCString, bool IsLast) {
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if (SpecIsCString && isa<PointerType>(Arg->getType())) {
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return appendString(Builder, Desc, Arg, IsLast);
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}
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// If the format specifies a string but the argument is not, the frontend will
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// have printed a warning. We just rely on undefined behaviour and send the
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// argument anyway.
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return appendArg(Builder, Desc, Arg, IsLast);
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}
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// Scan the format string to locate all specifiers, and mark the ones that
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// specify a string, i.e, the "%s" specifier with optional '*' characters.
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static void locateCStrings(SparseBitVector<8> &BV, StringRef Str) {
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static const char ConvSpecifiers[] = "diouxXfFeEgGaAcspn";
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size_t SpecPos = 0;
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// Skip the first argument, the format string.
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unsigned ArgIdx = 1;
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while ((SpecPos = Str.find_first_of('%', SpecPos)) != StringRef::npos) {
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if (Str[SpecPos + 1] == '%') {
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SpecPos += 2;
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continue;
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}
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auto SpecEnd = Str.find_first_of(ConvSpecifiers, SpecPos);
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if (SpecEnd == StringRef::npos)
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return;
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auto Spec = Str.slice(SpecPos, SpecEnd + 1);
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ArgIdx += Spec.count('*');
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if (Str[SpecEnd] == 's') {
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BV.set(ArgIdx);
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}
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SpecPos = SpecEnd + 1;
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++ArgIdx;
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}
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}
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// helper struct to package the string related data
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struct StringData {
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StringRef Str;
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Value *RealSize = nullptr;
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Value *AlignedSize = nullptr;
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bool IsConst = true;
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StringData(StringRef ST, Value *RS, Value *AS, bool IC)
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: Str(ST), RealSize(RS), AlignedSize(AS), IsConst(IC) {}
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};
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// Calculates frame size required for current printf expansion and allocates
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// space on printf buffer. Printf frame includes following contents
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// [ ControlDWord , format string/Hash , Arguments (each aligned to 8 byte) ]
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static Value *callBufferedPrintfStart(
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IRBuilder<> &Builder, ArrayRef<Value *> Args, Value *Fmt,
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bool isConstFmtStr, SparseBitVector<8> &SpecIsCString,
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SmallVectorImpl<StringData> &StringContents, Value *&ArgSize) {
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Module *M = Builder.GetInsertBlock()->getModule();
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Value *NonConstStrLen = nullptr;
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Value *LenWithNull = nullptr;
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Value *LenWithNullAligned = nullptr;
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Value *TempAdd = nullptr;
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// First 4 bytes to be reserved for control dword
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size_t BufSize = 4;
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if (isConstFmtStr)
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// First 8 bytes of MD5 hash
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BufSize += 8;
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else {
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LenWithNull = getStrlenWithNull(Builder, Fmt);
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// Align the computed length to next 8 byte boundary
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TempAdd = Builder.CreateAdd(LenWithNull,
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ConstantInt::get(LenWithNull->getType(), 7U));
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NonConstStrLen = Builder.CreateAnd(
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TempAdd, ConstantInt::get(LenWithNull->getType(), ~7U));
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StringContents.push_back(
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StringData(StringRef(), LenWithNull, NonConstStrLen, false));
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}
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for (size_t i = 1; i < Args.size(); i++) {
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if (SpecIsCString.test(i)) {
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StringRef ArgStr;
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if (getConstantStringInfo(Args[i], ArgStr)) {
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auto alignedLen = alignTo(ArgStr.size() + 1, 8);
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StringContents.push_back(StringData(
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ArgStr,
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/*RealSize*/ nullptr, /*AlignedSize*/ nullptr, /*IsConst*/ true));
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BufSize += alignedLen;
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} else {
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LenWithNull = getStrlenWithNull(Builder, Args[i]);
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// Align the computed length to next 8 byte boundary
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TempAdd = Builder.CreateAdd(
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LenWithNull, ConstantInt::get(LenWithNull->getType(), 7U));
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LenWithNullAligned = Builder.CreateAnd(
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TempAdd, ConstantInt::get(LenWithNull->getType(), ~7U));
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if (NonConstStrLen) {
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auto Val = Builder.CreateAdd(LenWithNullAligned, NonConstStrLen,
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"cumulativeAdd");
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NonConstStrLen = Val;
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} else
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NonConstStrLen = LenWithNullAligned;
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StringContents.push_back(
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StringData(StringRef(), LenWithNull, LenWithNullAligned, false));
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}
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} else {
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int AllocSize = M->getDataLayout().getTypeAllocSize(Args[i]->getType());
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// We end up expanding non string arguments to 8 bytes
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// (args smaller than 8 bytes)
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BufSize += std::max(AllocSize, 8);
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}
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}
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// calculate final size value to be passed to printf_alloc
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Value *SizeToReserve = ConstantInt::get(Builder.getInt64Ty(), BufSize, false);
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SmallVector<Value *, 1> Alloc_args;
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if (NonConstStrLen)
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SizeToReserve = Builder.CreateAdd(NonConstStrLen, SizeToReserve);
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ArgSize = Builder.CreateTrunc(SizeToReserve, Builder.getInt32Ty());
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Alloc_args.push_back(ArgSize);
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// call the printf_alloc function
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AttributeList Attr = AttributeList::get(
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Builder.getContext(), AttributeList::FunctionIndex, Attribute::NoUnwind);
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Type *Tys_alloc[1] = {Builder.getInt32Ty()};
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Type *PtrTy =
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Builder.getPtrTy(M->getDataLayout().getDefaultGlobalsAddressSpace());
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FunctionType *FTy_alloc = FunctionType::get(PtrTy, Tys_alloc, false);
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auto PrintfAllocFn =
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M->getOrInsertFunction(StringRef("__printf_alloc"), FTy_alloc, Attr);
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return Builder.CreateCall(PrintfAllocFn, Alloc_args, "printf_alloc_fn");
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}
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// Prepare constant string argument to push onto the buffer
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static void processConstantStringArg(StringData *SD, IRBuilder<> &Builder,
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SmallVectorImpl<Value *> &WhatToStore) {
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std::string Str(SD->Str.str() + '\0');
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DataExtractor Extractor(Str, /*IsLittleEndian=*/true, 8);
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DataExtractor::Cursor Offset(0);
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while (Offset && Offset.tell() < Str.size()) {
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const uint64_t ReadSize = 4;
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uint64_t ReadNow = std::min(ReadSize, Str.size() - Offset.tell());
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uint64_t ReadBytes = 0;
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switch (ReadNow) {
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default:
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llvm_unreachable("min(4, X) > 4?");
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case 1:
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ReadBytes = Extractor.getU8(Offset);
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break;
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case 2:
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ReadBytes = Extractor.getU16(Offset);
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break;
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case 3:
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ReadBytes = Extractor.getU24(Offset);
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break;
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case 4:
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ReadBytes = Extractor.getU32(Offset);
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break;
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}
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cantFail(Offset.takeError(), "failed to read bytes from constant array");
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APInt IntVal(8 * ReadSize, ReadBytes);
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// TODO: Should not bother aligning up.
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if (ReadNow < ReadSize)
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IntVal = IntVal.zext(8 * ReadSize);
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Type *IntTy = Type::getIntNTy(Builder.getContext(), IntVal.getBitWidth());
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WhatToStore.push_back(ConstantInt::get(IntTy, IntVal));
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}
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// Additional padding for 8 byte alignment
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int Rem = (Str.size() % 8);
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if (Rem > 0 && Rem <= 4)
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WhatToStore.push_back(ConstantInt::get(Builder.getInt32Ty(), 0));
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}
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static Value *processNonStringArg(Value *Arg, IRBuilder<> &Builder) {
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const DataLayout &DL = Builder.GetInsertBlock()->getModule()->getDataLayout();
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auto Ty = Arg->getType();
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if (auto IntTy = dyn_cast<IntegerType>(Ty)) {
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if (IntTy->getBitWidth() < 64) {
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return Builder.CreateZExt(Arg, Builder.getInt64Ty());
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}
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}
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if (Ty->isFloatingPointTy()) {
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if (DL.getTypeAllocSize(Ty) < 8) {
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return Builder.CreateFPExt(Arg, Builder.getDoubleTy());
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}
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}
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return Arg;
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}
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static void
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callBufferedPrintfArgPush(IRBuilder<> &Builder, ArrayRef<Value *> Args,
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Value *PtrToStore, SparseBitVector<8> &SpecIsCString,
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SmallVectorImpl<StringData> &StringContents,
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bool IsConstFmtStr) {
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Module *M = Builder.GetInsertBlock()->getModule();
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const DataLayout &DL = M->getDataLayout();
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auto StrIt = StringContents.begin();
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size_t i = IsConstFmtStr ? 1 : 0;
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for (; i < Args.size(); i++) {
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SmallVector<Value *, 32> WhatToStore;
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if ((i == 0) || SpecIsCString.test(i)) {
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if (StrIt->IsConst) {
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processConstantStringArg(StrIt, Builder, WhatToStore);
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StrIt++;
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} else {
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// This copies the contents of the string, however the next offset
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// is at aligned length, the extra space that might be created due
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// to alignment padding is not populated with any specific value
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// here. This would be safe as long as runtime is sync with
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// the offsets.
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Builder.CreateMemCpy(PtrToStore, /*DstAlign*/ Align(1), Args[i],
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/*SrcAlign*/ Args[i]->getPointerAlignment(DL),
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StrIt->RealSize);
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PtrToStore =
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Builder.CreateInBoundsGEP(Builder.getInt8Ty(), PtrToStore,
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{StrIt->AlignedSize}, "PrintBuffNextPtr");
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LLVM_DEBUG(dbgs() << "inserting gep to the printf buffer:"
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<< *PtrToStore << '\n');
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// done with current argument, move to next
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StrIt++;
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continue;
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}
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} else {
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WhatToStore.push_back(processNonStringArg(Args[i], Builder));
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}
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for (unsigned I = 0, E = WhatToStore.size(); I != E; ++I) {
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Value *toStore = WhatToStore[I];
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StoreInst *StBuff = Builder.CreateStore(toStore, PtrToStore);
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LLVM_DEBUG(dbgs() << "inserting store to printf buffer:" << *StBuff
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<< '\n');
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(void)StBuff;
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PtrToStore = Builder.CreateConstInBoundsGEP1_32(
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Builder.getInt8Ty(), PtrToStore,
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M->getDataLayout().getTypeAllocSize(toStore->getType()),
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"PrintBuffNextPtr");
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LLVM_DEBUG(dbgs() << "inserting gep to the printf buffer:" << *PtrToStore
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<< '\n');
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}
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}
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}
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Value *llvm::emitAMDGPUPrintfCall(IRBuilder<> &Builder, ArrayRef<Value *> Args,
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bool IsBuffered) {
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auto NumOps = Args.size();
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assert(NumOps >= 1);
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auto Fmt = Args[0];
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SparseBitVector<8> SpecIsCString;
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StringRef FmtStr;
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if (getConstantStringInfo(Fmt, FmtStr))
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locateCStrings(SpecIsCString, FmtStr);
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if (IsBuffered) {
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SmallVector<StringData, 8> StringContents;
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Module *M = Builder.GetInsertBlock()->getModule();
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LLVMContext &Ctx = Builder.getContext();
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auto Int8Ty = Builder.getInt8Ty();
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auto Int32Ty = Builder.getInt32Ty();
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bool IsConstFmtStr = !FmtStr.empty();
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Value *ArgSize = nullptr;
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Value *Ptr =
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callBufferedPrintfStart(Builder, Args, Fmt, IsConstFmtStr,
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SpecIsCString, StringContents, ArgSize);
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// The buffered version still follows OpenCL printf standards for
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// printf return value, i.e 0 on success, -1 on failure.
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ConstantPointerNull *zeroIntPtr =
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ConstantPointerNull::get(cast<PointerType>(Ptr->getType()));
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auto *Cmp = cast<ICmpInst>(Builder.CreateICmpNE(Ptr, zeroIntPtr, ""));
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BasicBlock *End = BasicBlock::Create(Ctx, "end.block",
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Builder.GetInsertBlock()->getParent());
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BasicBlock *ArgPush = BasicBlock::Create(
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Ctx, "argpush.block", Builder.GetInsertBlock()->getParent());
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BranchInst::Create(ArgPush, End, Cmp, Builder.GetInsertBlock());
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Builder.SetInsertPoint(ArgPush);
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// Create controlDWord and store as the first entry, format as follows
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// Bit 0 (LSB) -> stream (1 if stderr, 0 if stdout, printf always outputs to
|
|
// stdout) Bit 1 -> constant format string (1 if constant) Bits 2-31 -> size
|
|
// of printf data frame
|
|
auto ConstantTwo = Builder.getInt32(2);
|
|
auto ControlDWord = Builder.CreateShl(ArgSize, ConstantTwo);
|
|
if (IsConstFmtStr)
|
|
ControlDWord = Builder.CreateOr(ControlDWord, ConstantTwo);
|
|
|
|
Builder.CreateStore(ControlDWord, Ptr);
|
|
|
|
Ptr = Builder.CreateConstInBoundsGEP1_32(Int8Ty, Ptr, 4);
|
|
|
|
// Create MD5 hash for costant format string, push low 64 bits of the
|
|
// same onto buffer and metadata.
|
|
NamedMDNode *metaD = M->getOrInsertNamedMetadata("llvm.printf.fmts");
|
|
if (IsConstFmtStr) {
|
|
MD5 Hasher;
|
|
MD5::MD5Result Hash;
|
|
Hasher.update(FmtStr);
|
|
Hasher.final(Hash);
|
|
|
|
// Try sticking to llvm.printf.fmts format, although we are not going to
|
|
// use the ID and argument size fields while printing,
|
|
std::string MetadataStr =
|
|
"0:0:" + llvm::utohexstr(Hash.low(), /*LowerCase=*/true) + "," +
|
|
FmtStr.str();
|
|
MDString *fmtStrArray = MDString::get(Ctx, MetadataStr);
|
|
MDNode *myMD = MDNode::get(Ctx, fmtStrArray);
|
|
metaD->addOperand(myMD);
|
|
|
|
Builder.CreateStore(Builder.getInt64(Hash.low()), Ptr);
|
|
Ptr = Builder.CreateConstInBoundsGEP1_32(Int8Ty, Ptr, 8);
|
|
} else {
|
|
// Include a dummy metadata instance in case of only non constant
|
|
// format string usage, This might be an absurd usecase but needs to
|
|
// be done for completeness
|
|
if (metaD->getNumOperands() == 0) {
|
|
MDString *fmtStrArray =
|
|
MDString::get(Ctx, "0:0:ffffffff,\"Non const format string\"");
|
|
MDNode *myMD = MDNode::get(Ctx, fmtStrArray);
|
|
metaD->addOperand(myMD);
|
|
}
|
|
}
|
|
|
|
// Push The printf arguments onto buffer
|
|
callBufferedPrintfArgPush(Builder, Args, Ptr, SpecIsCString, StringContents,
|
|
IsConstFmtStr);
|
|
|
|
// End block, returns -1 on failure
|
|
BranchInst::Create(End, ArgPush);
|
|
Builder.SetInsertPoint(End);
|
|
return Builder.CreateSExt(Builder.CreateNot(Cmp), Int32Ty, "printf_result");
|
|
}
|
|
|
|
auto Desc = callPrintfBegin(Builder, Builder.getIntN(64, 0));
|
|
Desc = appendString(Builder, Desc, Fmt, NumOps == 1);
|
|
|
|
// FIXME: This invokes hostcall once for each argument. We can pack up to
|
|
// seven scalar printf arguments in a single hostcall. See the signature of
|
|
// callAppendArgs().
|
|
for (unsigned int i = 1; i != NumOps; ++i) {
|
|
bool IsLast = i == NumOps - 1;
|
|
bool IsCString = SpecIsCString.test(i);
|
|
Desc = processArg(Builder, Desc, Args[i], IsCString, IsLast);
|
|
}
|
|
|
|
return Builder.CreateTrunc(Desc, Builder.getInt32Ty());
|
|
}
|