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      1 /*
      2  * Copyright 2012, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "bcc/Renderscript/RSCompiler.h"
     18 
     19 #include <llvm/IR/Module.h>
     20 #include <llvm/PassManager.h>
     21 #include <llvm/Transforms/IPO.h>
     22 
     23 #include "bcc/Renderscript/RSExecutable.h"
     24 #include "bcc/Renderscript/RSInfo.h"
     25 #include "bcc/Renderscript/RSScript.h"
     26 #include "bcc/Renderscript/RSTransforms.h"
     27 #include "bcc/Source.h"
     28 #include "bcc/Support/Log.h"
     29 
     30 using namespace bcc;
     31 
     32 bool RSCompiler::addInternalizeSymbolsPass(Script &pScript, llvm::PassManager &pPM) {
     33   // Add a pass to internalize the symbols that don't need to have global
     34   // visibility.
     35   RSScript &script = static_cast<RSScript &>(pScript);
     36   const RSInfo *info = script.getInfo();
     37 
     38   // The vector contains the symbols that should not be internalized.
     39   std::vector<const char *> export_symbols;
     40 
     41   // Special RS functions should always be global symbols.
     42   const char **special_functions = RSExecutable::SpecialFunctionNames;
     43   while (*special_functions != NULL) {
     44     export_symbols.push_back(*special_functions);
     45     special_functions++;
     46   }
     47 
     48   // Visibility of symbols appeared in rs_export_var and rs_export_func should
     49   // also be preserved.
     50   const RSInfo::ExportVarNameListTy &export_vars = info->getExportVarNames();
     51   const RSInfo::ExportFuncNameListTy &export_funcs = info->getExportFuncNames();
     52 
     53   for (RSInfo::ExportVarNameListTy::const_iterator
     54            export_var_iter = export_vars.begin(),
     55            export_var_end = export_vars.end();
     56        export_var_iter != export_var_end; export_var_iter++) {
     57     export_symbols.push_back(*export_var_iter);
     58   }
     59 
     60   for (RSInfo::ExportFuncNameListTy::const_iterator
     61            export_func_iter = export_funcs.begin(),
     62            export_func_end = export_funcs.end();
     63        export_func_iter != export_func_end; export_func_iter++) {
     64     export_symbols.push_back(*export_func_iter);
     65   }
     66 
     67   // Expanded foreach functions should not be internalized, too.
     68   const RSInfo::ExportForeachFuncListTy &export_foreach_func =
     69       info->getExportForeachFuncs();
     70   std::vector<std::string> expanded_foreach_funcs;
     71   for (RSInfo::ExportForeachFuncListTy::const_iterator
     72            foreach_func_iter = export_foreach_func.begin(),
     73            foreach_func_end = export_foreach_func.end();
     74        foreach_func_iter != foreach_func_end; foreach_func_iter++) {
     75     std::string name(foreach_func_iter->first);
     76     expanded_foreach_funcs.push_back(name.append(".expand"));
     77   }
     78 
     79   // Need to wait until ForEachExpandList is fully populated to fill in
     80   // exported symbols.
     81   for (size_t i = 0; i < expanded_foreach_funcs.size(); i++) {
     82     export_symbols.push_back(expanded_foreach_funcs[i].c_str());
     83   }
     84 
     85   pPM.add(llvm::createInternalizePass(export_symbols));
     86 
     87   return true;
     88 }
     89 
     90 bool RSCompiler::addExpandForEachPass(Script &pScript, llvm::PassManager &pPM) {
     91   // Script passed to RSCompiler must be a RSScript.
     92   RSScript &script = static_cast<RSScript &>(pScript);
     93   const RSInfo *info = script.getInfo();
     94   llvm::Module &module = script.getSource().getModule();
     95 
     96   if (info == NULL) {
     97     ALOGE("Missing RSInfo in RSScript to run the pass for foreach expansion on "
     98           "%s!", module.getModuleIdentifier().c_str());
     99     return false;
    100   }
    101 
    102   // Expand ForEach on CPU path to reduce launch overhead.
    103   bool pEnableStepOpt = true;
    104   pPM.add(createRSForEachExpandPass(info->getExportForeachFuncs(),
    105                                     pEnableStepOpt));
    106   if (script.getEmbedInfo())
    107     pPM.add(createRSEmbedInfoPass(info));
    108 
    109   return true;
    110 }
    111 
    112 bool RSCompiler::beforeAddLTOPasses(Script &pScript, llvm::PassManager &pPM) {
    113   if (!addExpandForEachPass(pScript, pPM))
    114     return false;
    115 
    116   if (!addInternalizeSymbolsPass(pScript, pPM))
    117     return false;
    118 
    119   return true;
    120 }
    121