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| //===--- RuntimeDebugBuilder.cpp - Helper to insert prints into LLVM-IR ---===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#include "polly/CodeGen/RuntimeDebugBuilder.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include <string>
#include <vector>
using namespace llvm;
using namespace polly;
Function *RuntimeDebugBuilder::getVPrintF(PollyIRBuilder &Builder) {
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
const char *Name = "vprintf";
Function *F = M->getFunction(Name);
if (!F) {
GlobalValue::LinkageTypes Linkage = Function::ExternalLinkage;
FunctionType *Ty = FunctionType::get(
Builder.getInt32Ty(), {Builder.getInt8PtrTy(), Builder.getInt8PtrTy()},
false);
F = Function::Create(Ty, Linkage, Name, M);
}
return F;
}
Function *RuntimeDebugBuilder::getAddressSpaceCast(PollyIRBuilder &Builder,
unsigned Src, unsigned Dst,
unsigned SrcBits,
unsigned DstBits) {
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
auto Name = std::string("llvm.nvvm.ptr.constant.to.gen.p") +
std::to_string(Dst) + "i" + std::to_string(DstBits) + ".p" +
std::to_string(Src) + "i" + std::to_string(SrcBits);
Function *F = M->getFunction(Name);
if (!F) {
GlobalValue::LinkageTypes Linkage = Function::ExternalLinkage;
FunctionType *Ty = FunctionType::get(
PointerType::get(Builder.getIntNTy(DstBits), Dst),
PointerType::get(Builder.getIntNTy(SrcBits), Src), false);
F = Function::Create(Ty, Linkage, Name, M);
}
return F;
}
std::vector<Value *>
RuntimeDebugBuilder::getGPUThreadIdentifiers(PollyIRBuilder &Builder) {
std::vector<Value *> Identifiers;
auto M = Builder.GetInsertBlock()->getParent()->getParent();
std::vector<Function *> BlockIDs = {
Intrinsic::getDeclaration(M, Intrinsic::nvvm_read_ptx_sreg_ctaid_x),
Intrinsic::getDeclaration(M, Intrinsic::nvvm_read_ptx_sreg_ctaid_y),
Intrinsic::getDeclaration(M, Intrinsic::nvvm_read_ptx_sreg_ctaid_z),
};
Identifiers.push_back(Builder.CreateGlobalStringPtr("> block-id: ", "", 4));
for (auto GetID : BlockIDs) {
Value *Id = Builder.CreateCall(GetID, {});
Id = Builder.CreateIntCast(Id, Builder.getInt64Ty(), false);
Identifiers.push_back(Id);
Identifiers.push_back(Builder.CreateGlobalStringPtr(" ", "", 4));
}
Identifiers.push_back(Builder.CreateGlobalStringPtr("| ", "", 4));
std::vector<Function *> ThreadIDs = {
Intrinsic::getDeclaration(M, Intrinsic::nvvm_read_ptx_sreg_tid_x),
Intrinsic::getDeclaration(M, Intrinsic::nvvm_read_ptx_sreg_tid_y),
Intrinsic::getDeclaration(M, Intrinsic::nvvm_read_ptx_sreg_tid_z),
};
Identifiers.push_back(Builder.CreateGlobalStringPtr("thread-id: ", "", 4));
for (auto GetId : ThreadIDs) {
Value *Id = Builder.CreateCall(GetId, {});
Id = Builder.CreateIntCast(Id, Builder.getInt64Ty(), false);
Identifiers.push_back(Id);
Identifiers.push_back(Builder.CreateGlobalStringPtr(" ", "", 4));
}
return Identifiers;
}
void RuntimeDebugBuilder::createPrinter(PollyIRBuilder &Builder, bool IsGPU,
ArrayRef<Value *> Values) {
if (IsGPU)
createGPUPrinterT(Builder, Values);
else
createCPUPrinterT(Builder, Values);
}
bool RuntimeDebugBuilder::isPrintable(Type *Ty) {
if (Ty->isFloatingPointTy())
return true;
if (Ty->isIntegerTy())
return Ty->getIntegerBitWidth() <= 64;
if (isa<PointerType>(Ty))
return true;
return false;
}
static std::tuple<std::string, std::vector<Value *>>
prepareValuesForPrinting(PollyIRBuilder &Builder, ArrayRef<Value *> Values) {
std::string FormatString;
std::vector<Value *> ValuesToPrint;
for (auto Val : Values) {
Type *Ty = Val->getType();
if (Ty->isFloatingPointTy()) {
if (!Ty->isDoubleTy())
Val = Builder.CreateFPExt(Val, Builder.getDoubleTy());
} else if (Ty->isIntegerTy()) {
if (Ty->getIntegerBitWidth() < 64)
Val = Builder.CreateSExt(Val, Builder.getInt64Ty());
else
assert(Ty->getIntegerBitWidth() &&
"Integer types larger 64 bit not supported");
} else if (isa<PointerType>(Ty)) {
if (Ty->getPointerElementType() == Builder.getInt8Ty() &&
Ty->getPointerAddressSpace() == 4) {
Val = Builder.CreateGEP(Val, Builder.getInt64(0));
} else {
Val = Builder.CreatePtrToInt(Val, Builder.getInt64Ty());
}
} else {
llvm_unreachable("Unknown type");
}
Ty = Val->getType();
if (Ty->isFloatingPointTy())
FormatString += "%f";
else if (Ty->isIntegerTy())
FormatString += "%ld";
else
FormatString += "%s";
ValuesToPrint.push_back(Val);
}
return std::make_tuple(FormatString, ValuesToPrint);
}
void RuntimeDebugBuilder::createCPUPrinterT(PollyIRBuilder &Builder,
ArrayRef<Value *> Values) {
std::string FormatString;
std::vector<Value *> ValuesToPrint;
std::tie(FormatString, ValuesToPrint) =
prepareValuesForPrinting(Builder, Values);
createPrintF(Builder, FormatString, ValuesToPrint);
createFlush(Builder);
}
void RuntimeDebugBuilder::createGPUPrinterT(PollyIRBuilder &Builder,
ArrayRef<Value *> Values) {
std::string str;
auto *Zero = Builder.getInt64(0);
auto ToPrint = getGPUThreadIdentifiers(Builder);
ToPrint.push_back(Builder.CreateGlobalStringPtr("\n ", "", 4));
ToPrint.insert(ToPrint.end(), Values.begin(), Values.end());
const DataLayout &DL = Builder.GetInsertBlock()->getModule()->getDataLayout();
// Allocate print buffer (assuming 2*32 bit per element)
auto T = ArrayType::get(Builder.getInt32Ty(), ToPrint.size() * 2);
Value *Data = new AllocaInst(
T, DL.getAllocaAddrSpace(), "polly.vprint.buffer",
&Builder.GetInsertBlock()->getParent()->getEntryBlock().front());
auto *DataPtr = Builder.CreateGEP(Data, {Zero, Zero});
int Offset = 0;
for (auto Val : ToPrint) {
auto Ptr = Builder.CreateGEP(DataPtr, Builder.getInt64(Offset));
Type *Ty = Val->getType();
if (Ty->isFloatingPointTy()) {
if (!Ty->isDoubleTy())
Val = Builder.CreateFPExt(Val, Builder.getDoubleTy());
} else if (Ty->isIntegerTy()) {
if (Ty->getIntegerBitWidth() < 64) {
Val = Builder.CreateSExt(Val, Builder.getInt64Ty());
} else {
assert(Ty->getIntegerBitWidth() == 64 &&
"Integer types larger 64 bit not supported");
// fallthrough
}
} else if (auto PtTy = dyn_cast<PointerType>(Ty)) {
if (PtTy->getAddressSpace() == 4) {
// Pointers in constant address space are printed as strings
Val = Builder.CreateGEP(Val, Builder.getInt64(0));
auto F = RuntimeDebugBuilder::getAddressSpaceCast(Builder, 4, 0);
Val = Builder.CreateCall(F, Val);
} else {
Val = Builder.CreatePtrToInt(Val, Builder.getInt64Ty());
}
} else {
llvm_unreachable("Unknown type");
}
Ty = Val->getType();
Ptr = Builder.CreatePointerBitCastOrAddrSpaceCast(Ptr, Ty->getPointerTo(5));
Builder.CreateAlignedStore(Val, Ptr, 4);
if (Ty->isFloatingPointTy())
str += "%f";
else if (Ty->isIntegerTy())
str += "%ld";
else
str += "%s";
Offset += 2;
}
Value *Format = Builder.CreateGlobalStringPtr(str, "polly.vprintf.buffer", 4);
Format = Builder.CreateCall(getAddressSpaceCast(Builder, 4, 0), Format);
Data = Builder.CreateBitCast(Data, Builder.getInt8PtrTy());
Builder.CreateCall(getVPrintF(Builder), {Format, Data});
}
Function *RuntimeDebugBuilder::getPrintF(PollyIRBuilder &Builder) {
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
const char *Name = "printf";
Function *F = M->getFunction(Name);
if (!F) {
GlobalValue::LinkageTypes Linkage = Function::ExternalLinkage;
FunctionType *Ty = FunctionType::get(Builder.getInt32Ty(), true);
F = Function::Create(Ty, Linkage, Name, M);
}
return F;
}
void RuntimeDebugBuilder::createPrintF(PollyIRBuilder &Builder,
std::string Format,
ArrayRef<Value *> Values) {
Value *FormatString = Builder.CreateGlobalStringPtr(Format);
std::vector<Value *> Arguments;
Arguments.push_back(FormatString);
Arguments.insert(Arguments.end(), Values.begin(), Values.end());
Builder.CreateCall(getPrintF(Builder), Arguments);
}
void RuntimeDebugBuilder::createFlush(PollyIRBuilder &Builder) {
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
const char *Name = "fflush";
Function *F = M->getFunction(Name);
if (!F) {
GlobalValue::LinkageTypes Linkage = Function::ExternalLinkage;
FunctionType *Ty =
FunctionType::get(Builder.getInt32Ty(), Builder.getInt8PtrTy(), false);
F = Function::Create(Ty, Linkage, Name, M);
}
// fflush(NULL) flushes _all_ open output streams.
//
// fflush is declared as 'int fflush(FILE *stream)'. As we only pass on a NULL
// pointer, the type we point to does conceptually not matter. However, if
// fflush is already declared in this translation unit, we use the very same
// type to ensure that LLVM does not complain about mismatching types.
Builder.CreateCall(F, Constant::getNullValue(F->arg_begin()->getType()));
}
|