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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/Module.h"
#include <string>
#include <vector>
using namespace llvm;
using namespace polly;
llvm::Value *RuntimeDebugBuilder::getPrintableString(PollyIRBuilder &Builder,
llvm::StringRef Str) {
// FIXME: addressspace(4) is a marker for a string (for the %s conversion
// specifier) but should be using the default address space. This only works
// because CPU backends typically ignore the address space. For constant
// strings as returned by getPrintableString, the format string should instead
// directly spell out the string.
return Builder.CreateGlobalStringPtr(Str, "", 4);
}
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;
}
void RuntimeDebugBuilder::createPrinter(PollyIRBuilder &Builder,
ArrayRef<Value *> Values) {
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 == Builder.getInt8PtrTy(4)) {
Val = Builder.CreateGEP(Builder.getInt8Ty(), 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);
}
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()));
}
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