RSCompiler.cpp revision 25eb586bb055ae07c7e82a2b1bdbd6936641580c 
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/Assert.h"
24#include "bcc/Renderscript/RSExecutable.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#include "bcinfo/MetadataExtractor.h"
30
31using namespace bcc;
32
33bool RSCompiler::addInternalizeSymbolsPass(Script &pScript, llvm::PassManager &pPM) {
34  // Add a pass to internalize the symbols that don't need to have global
35  // visibility.
36  RSScript &script = static_cast<RSScript &>(pScript);
37  llvm::Module &module = script.getSource().getModule();
38  bcinfo::MetadataExtractor me(&module);
39  if (!me.extract()) {
40    bccAssert(false && "Could not extract metadata for module!");
41    return false;
42  }
43
44  // The vector contains the symbols that should not be internalized.
45  std::vector<const char *> export_symbols;
46
47  // Special RS functions should always be global symbols.
48  const char **special_functions = RSExecutable::SpecialFunctionNames;
49  while (*special_functions != NULL) {
50    export_symbols.push_back(*special_functions);
51    special_functions++;
52  }
53
54  // Visibility of symbols appeared in rs_export_var and rs_export_func should
55  // also be preserved.
56  size_t exportVarCount = me.getExportVarCount();
57  size_t exportFuncCount = me.getExportFuncCount();
58  size_t exportForEachCount = me.getExportForEachSignatureCount();
59  const char **exportVarNameList = me.getExportVarNameList();
60  const char **exportFuncNameList = me.getExportFuncNameList();
61  const char **exportForEachNameList = me.getExportForEachNameList();
62  size_t i;
63
64  for (i = 0; i < exportVarCount; ++i) {
65    export_symbols.push_back(exportVarNameList[i]);
66  }
67
68  for (i = 0; i < exportFuncCount; ++i) {
69    export_symbols.push_back(exportFuncNameList[i]);
70  }
71
72  // Expanded foreach functions should not be internalized, too.
73  // expanded_foreach_funcs keeps the .expand version of the kernel names
74  // around until createInternalizePass() is finished making its own
75  // copy of the visible symbols.
76  std::vector<std::string> expanded_foreach_funcs;
77  for (i = 0; i < exportForEachCount; ++i) {
78    expanded_foreach_funcs.push_back(
79        std::string(exportForEachNameList[i]) + ".expand");
80    export_symbols.push_back(expanded_foreach_funcs[i].c_str());
81  }
82  pPM.add(llvm::createInternalizePass(export_symbols));
83
84  return true;
85}
86
87bool RSCompiler::addExpandForEachPass(Script &pScript, llvm::PassManager &pPM) {
88  // Script passed to RSCompiler must be a RSScript.
89  RSScript &script = static_cast<RSScript &>(pScript);
90
91  // Expand ForEach on CPU path to reduce launch overhead.
92  bool pEnableStepOpt = true;
93  pPM.add(createRSForEachExpandPass(pEnableStepOpt));
94  if (script.getEmbedInfo())
95    pPM.add(createRSEmbedInfoPass());
96
97  return true;
98}
99
100bool RSCompiler::beforeAddLTOPasses(Script &pScript, llvm::PassManager &pPM) {
101  if (!addExpandForEachPass(pScript, pPM))
102    return false;
103
104  if (!addInternalizeSymbolsPass(pScript, pPM))
105    return false;
106
107  return true;
108}
109