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/Support/CompilerConfig.h"
18
19 #include <llvm/CodeGen/SchedulerRegistry.h>
20 #include <llvm/MC/SubtargetFeature.h>
21 #include <llvm/Support/TargetRegistry.h>
22
23 #include "bcc/Support/Log.h"
24 #include "bcc/Support/TargetCompilerConfigs.h"
25
26 using namespace bcc;
27
CompilerConfig(const std::string & pTriple)28 CompilerConfig::CompilerConfig(const std::string &pTriple)
29 : mTriple(pTriple), mTarget(NULL) {
30 //===--------------------------------------------------------------------===//
31 // Default setting of register sheduler
32 //===--------------------------------------------------------------------===//
33 llvm::RegisterScheduler::setDefault(llvm::createDefaultScheduler);
34
35 //===--------------------------------------------------------------------===//
36 // Default setting of target options
37 //===--------------------------------------------------------------------===//
38 // Use hardfloat ABI by default.
39 //
40 // TODO(all): Need to detect the CPU capability and decide whether to use
41 // softfp. To use softfp, change the following 2 lines to
42 //
43 // options.FloatABIType = llvm::FloatABI::Soft;
44 // options.UseSoftFloat = true;
45 mTargetOpts.FloatABIType = llvm::FloatABI::Soft;
46 mTargetOpts.UseSoftFloat = false;
47
48 // Enable frame pointer elimination optimization by default.
49 mTargetOpts.NoFramePointerElim = false;
50
51 //===--------------------------------------------------------------------===//
52 // Default setting for code model
53 //===--------------------------------------------------------------------===//
54 mCodeModel = llvm::CodeModel::Small;
55
56 //===--------------------------------------------------------------------===//
57 // Default setting for relocation model
58 //===--------------------------------------------------------------------===//
59 mRelocModel = llvm::Reloc::Default;
60
61 //===--------------------------------------------------------------------===//
62 // Default setting for optimization level (-O2)
63 //===--------------------------------------------------------------------===//
64 mOptLevel = llvm::CodeGenOpt::Default;
65
66 //===--------------------------------------------------------------------===//
67 // Default setting for architecture type
68 //===--------------------------------------------------------------------===//
69 mArchType = llvm::Triple::UnknownArch;
70
71 initializeTarget();
72 initializeArch();
73
74 return;
75 }
76
initializeTarget()77 bool CompilerConfig::initializeTarget() {
78 std::string error;
79 mTarget = llvm::TargetRegistry::lookupTarget(mTriple, error);
80 if (mTarget != NULL) {
81 return true;
82 } else {
83 ALOGE("Cannot initialize llvm::Target for given triple '%s'! (%s)",
84 mTriple.c_str(), error.c_str());
85 return false;
86 }
87 }
88
initializeArch()89 void CompilerConfig::initializeArch() {
90 if (mTarget != NULL) {
91 mArchType = llvm::Triple::getArchTypeForLLVMName(mTarget->getName());
92 } else {
93 mArchType = llvm::Triple::UnknownArch;
94 }
95 return;
96 }
97
setFeatureString(const std::vector<std::string> & pAttrs)98 void CompilerConfig::setFeatureString(const std::vector<std::string> &pAttrs) {
99 llvm::SubtargetFeatures f;
100
101 for (std::vector<std::string>::const_iterator attr_iter = pAttrs.begin(),
102 attr_end = pAttrs.end();
103 attr_iter != attr_end; attr_iter++) {
104 f.AddFeature(*attr_iter);
105 }
106
107 mFeatureString = f.getString();
108 return;
109 }
110