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/*
* Copyright 2010-2012, 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "bcc/Script.h"
#include "Assert.h"
#include "Log.h"
#include "bcc/CompilerConfig.h"
#include "bcc/Source.h"
#include "bcinfo/MetadataExtractor.h"
#include <llvm/IR/Module.h>
using namespace bcc;
Script::Script(Source *pSource)
: mSource(pSource),
mOptimizationLevel(llvm::CodeGenOpt::Aggressive),
mLinkRuntimeCallback(nullptr), mEmbedInfo(false), mEmbedGlobalInfo(false),
mEmbedGlobalInfoSkipConstant(false) {}
bool Script::LinkRuntime(const char *core_lib) {
bccAssert(core_lib != nullptr);
// Using the same context with the source.
BCCContext &context = mSource->getContext();
Source *libclcore_source = Source::CreateFromFile(context, core_lib);
if (libclcore_source == nullptr) {
ALOGE("Failed to load Renderscript library '%s' to link!", core_lib);
return false;
}
if (mLinkRuntimeCallback != nullptr) {
mLinkRuntimeCallback(this, &mSource->getModule(),
&libclcore_source->getModule());
}
// For every named metadata node in the source (libclcore_source),
// the merge process ensures there is a same-named metadata node in
// the destination (mSource) (creating it if necessary) and appends
// all of the source node's operands to the end of the destination
// node's operands. In the case of the wrapper metadata
//
// kWrapperMetadataName -> (compilerVersion, optimizationLevel)
//
// this is not the behavior we want. Instead, we want to retain the
// source wrapper metadata:
// - compiler version in libclcore_source is 0, a nonsensical value.
// As documented in slang_version.h, libclcore_source must not
// violate any compiler version guarantees, so the right thing to
// do is retain the compiler version from source, which specifies
// which guarantees source (and hence the merged code) satisfies.
// See frameworks/rs/driver/README.txt regarding libclcore_source
// obeying compiler version guarantees.
// - optimization level in source and libclcore_source is meaningful.
// We simply define the optimization level in the linked code to
// be the optimization level of source.
// The easiest way to retain the source wrapper metadata is to delete
// the libclcore_source wrapper metadata.
llvm::Module &libclcore_module = libclcore_source->getModule();
llvm::NamedMDNode *const wrapperMDNode =
libclcore_module.getNamedMetadata(bcinfo::MetadataExtractor::kWrapperMetadataName);
bccAssert(wrapperMDNode != nullptr);
libclcore_module.eraseNamedMetadata(wrapperMDNode);
if (!mSource->merge(*libclcore_source)) {
ALOGE("Failed to link Renderscript library '%s'!", core_lib);
delete libclcore_source;
return false;
}
return true;
}
bool Script::mergeSource(Source &pSource) { return mSource->merge(pSource); }
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