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
addInternalizeSymbolsPass(Script & pScript,llvm::PassManager & pPM)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
addExpandForEachPass(Script & pScript,llvm::PassManager & pPM)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
beforeAddLTOPasses(Script & pScript,llvm::PassManager & pPM)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