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* Copyright 2015, The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef BCC_RS_UTILS_H
#define BCC_RS_UTILS_H
#include "rsDefines.h"
#include <llvm/IR/Type.h>
#include <llvm/IR/DerivedTypes.h>
#include <llvm/ADT/StringRef.h>
#include <string>
namespace {
static inline llvm::StringRef getUnsuffixedStructName(const llvm::StructType *T) {
// Bug: 22926131
// When building with assertions enabled, LLVM cannot read the name of a
// literal (anonymous) structure, because they shouldn't actually ever have
// a name. Unfortunately, due to past definitions of RenderScript object
// types as anonymous structures typedef-ed to their proper typename,
// we had been relying on accessing this information. LLVM bitcode retains
// the typedef-ed name for such anonymous structures. There is a
// corresponding (safe) fix to the RenderScript headers to actually name
// these types the same as their typedef name to simplify things. That
// fixes this issue going forward, but it won't allow us to compile legacy
// code properly. In that case, we just have non-assert builds ignore the
// fact that anonymous structures shouldn't have their name read, and do it
// anyway. Note that RSCompilerDriver.cpp checks the compiler version
// number (from llvm-rs-cc) to ensure that we are only ever building modern
// code when we have assertions enabled. Legacy code can only be compiled
// correctly with a non-asserting compiler.
// Note that the whole reason for looking at the "unsuffixed" name of the
// type is because LLVM suffixes duplicate typedefs of the same anonymous
// structure. In the new case, where all of the RS object types have a
// proper name, they won't have a dotted suffix at all. We still need
// to look at the old unsuffixed version to handle legacy code properly.
if (T->isLiteral()) {
return "";
// Get just the object type name with no suffix.
size_t LastDot = T->getName().rfind('.');
if (LastDot == strlen("struct")) {
// If we get back to just the "struct" part, we know that we had a
// raw typename (i.e. struct.rs_element with no ".[0-9]+" suffix on it.
// In that case, we will want to create our slice such that it contains
// the entire name.
LastDot = T->getName().size();
return T->getStructName().slice(0, LastDot);
const char kAllocationTypeName[] = "struct.rs_allocation";
const char kElementTypeName[] = "struct.rs_element";
const char kSamplerTypeName[] = "struct.rs_sampler";
const char kScriptTypeName[] = "struct.rs_script";
const char kTypeTypeName[] = "struct.rs_type";
// Returns the RsDataType for a given input LLVM type.
// This is only used to distinguish the associated RS object types (i.e.
// rs_allocation, rs_element, rs_sampler, rs_script, and rs_type).
// All other types are reported back as RS_TYPE_NONE, since no special
// handling would be necessary.
static inline enum RsDataType getRsDataTypeForType(const llvm::Type *T) {
if (T->isStructTy()) {
const llvm::StringRef StructName = getUnsuffixedStructName(llvm::dyn_cast<const llvm::StructType>(T));
if (StructName.equals(kAllocationTypeName)) {
} else if (StructName.equals(kElementTypeName)) {
} else if (StructName.equals(kSamplerTypeName)) {
} else if (StructName.equals(kScriptTypeName)) {
} else if (StructName.equals(kTypeTypeName)) {
return RS_TYPE_TYPE;
return RS_TYPE_NONE;
// Returns true if the input type is one of our RenderScript object types
// (allocation, element, sampler, script, type) and false if it is not.
static inline bool isRsObjectType(const llvm::Type *T) {
return getRsDataTypeForType(T) != RS_TYPE_NONE;
} // end namespace
// When we have a general reduction kernel with no combiner function,
// we will synthesize a combiner function from the accumulator
// function. Given the accumulator function name, what should be the
// name of the combiner function?
static inline std::string nameReduceCombinerFromAccumulator(llvm::StringRef accumName) {
return std::string(accumName) + ".combiner";
#endif // BCC_RS_UTILS_H