1 //===-- RenderScriptExpressionOpts.cpp --------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // C Includes 11 // C++ Includes 12 #include <string> 13 14 // Other libraries and framework includes 15 #include "llvm/ADT/None.h" 16 #include "llvm/ADT/StringRef.h" 17 #include "llvm/IR/Instruction.h" 18 #include "llvm/IR/Instructions.h" 19 #include "llvm/IR/LegacyPassManager.h" 20 #include "llvm/IR/Module.h" 21 #include "llvm/Support/TargetRegistry.h" 22 #include "llvm/Target/TargetMachine.h" 23 #include "llvm/Target/TargetOptions.h" 24 25 #include "clang/Basic/TargetOptions.h" 26 27 // Project includes 28 #include "lldb/Target/Process.h" 29 #include "lldb/Target/Target.h" 30 #include "lldb/Utility/Log.h" 31 32 #include "RenderScriptExpressionOpts.h" 33 #include "RenderScriptRuntime.h" 34 #include "RenderScriptx86ABIFixups.h" 35 36 using namespace lldb_private; 37 using namespace lldb_renderscript; 38 39 // [``slang``](https://android.googlesource.com/platform/frameworks/compile/slang), 40 // the compiler frontend for RenderScript embeds an ARM specific triple in IR 41 // that is shipped in the app, after generating IR that has some assumptions 42 // that an ARM device is the target. As the IR is then compiled on a device of 43 // unknown (at time the IR was generated at least) architecture, when calling 44 // RenderScript API function as part of debugger expressions, we have to 45 // perform a fixup pass that removes those assumptions right before the module 46 // is sent to be generated by the llvm backend. 47 48 namespace { 49 bool registerRSDefaultTargetOpts(clang::TargetOptions &proto, 50 const llvm::Triple::ArchType &arch) { 51 switch (arch) { 52 case llvm::Triple::ArchType::x86: 53 proto.Triple = "i686--linux-android"; 54 proto.CPU = "atom"; 55 proto.Features.push_back("+long64"); 56 // Fallthrough for common x86 family features 57 LLVM_FALLTHROUGH; 58 case llvm::Triple::ArchType::x86_64: 59 proto.Features.push_back("+mmx"); 60 proto.Features.push_back("+sse"); 61 proto.Features.push_back("+sse2"); 62 proto.Features.push_back("+sse3"); 63 proto.Features.push_back("+ssse3"); 64 proto.Features.push_back("+sse4.1"); 65 proto.Features.push_back("+sse4.2"); 66 break; 67 case llvm::Triple::ArchType::mipsel: 68 // pretend this is `arm' for the front-end 69 proto.Triple = "armv7-none-linux-android"; 70 proto.CPU = ""; 71 proto.Features.push_back("+long64"); 72 break; 73 case llvm::Triple::ArchType::mips64el: 74 // pretend this is `aarch64' for the front-end 75 proto.Triple = "aarch64-none-linux-android"; 76 proto.CPU = ""; 77 break; 78 default: 79 return false; 80 } 81 return true; 82 } 83 } // end anonymous namespace 84 85 bool RenderScriptRuntimeModulePass::runOnModule(llvm::Module &module) { 86 bool changed_module = false; 87 Log *log( 88 GetLogIfAllCategoriesSet(LIBLLDB_LOG_LANGUAGE | LIBLLDB_LOG_EXPRESSIONS)); 89 90 std::string err; 91 llvm::StringRef real_triple = 92 m_process_ptr->GetTarget().GetArchitecture().GetTriple().getTriple(); 93 const llvm::Target *target_info = 94 llvm::TargetRegistry::lookupTarget(real_triple, err); 95 if (!target_info) { 96 if (log) 97 log->Warning("couldn't determine real target architecture: '%s'", 98 err.c_str()); 99 return false; 100 } 101 102 llvm::Optional<llvm::Reloc::Model> reloc_model = llvm::None; 103 assert(m_process_ptr && "no available lldb process"); 104 switch (m_process_ptr->GetTarget().GetArchitecture().GetMachine()) { 105 case llvm::Triple::ArchType::x86: 106 changed_module |= fixupX86FunctionCalls(module); 107 // For some reason this triple gets totally missed by the backend, and must 108 // be set manually. There a reference in bcc/Main.cpp about auto feature- 109 // detection being removed from LLVM3.5, but I can't see that discussion 110 // anywhere public. 111 real_triple = "i686--linux-android"; 112 break; 113 case llvm::Triple::ArchType::x86_64: 114 changed_module |= fixupX86_64FunctionCalls(module); 115 break; 116 case llvm::Triple::ArchType::mipsel: 117 case llvm::Triple::ArchType::mips64el: 118 // No actual IR fixup pass is needed on MIPS, but the datalayout and 119 // targetmachine do need to be explicitly set. 120 121 // bcc explicitly compiles MIPS code to use the static relocation model due 122 // to an issue with relocations in mclinker. see 123 // libbcc/support/CompilerConfig.cpp for details 124 reloc_model = llvm::Reloc::Static; 125 changed_module = true; 126 break; 127 case llvm::Triple::ArchType::arm: 128 case llvm::Triple::ArchType::aarch64: 129 // ARM subtargets need no fixup passes as they are the initial target as 130 // generated by the 131 // slang compiler frontend. 132 break; 133 default: 134 if (log) 135 log->Warning("Ignoring unknown renderscript target"); 136 return false; 137 } 138 139 if (changed_module) { 140 llvm::TargetOptions options; 141 llvm::TargetMachine *target_machine = target_info->createTargetMachine( 142 real_triple, "", "", options, reloc_model); 143 assert(target_machine && 144 "failed to identify RenderScriptRuntime target machine"); 145 // We've been using a triple and datalayout of some ARM variant all along, 146 // so we need to let the backend know that this is no longer the case. 147 if (log) { 148 log->Printf("%s - Changing RS target triple to '%s'", __FUNCTION__, 149 real_triple.str().c_str()); 150 log->Printf( 151 "%s - Changing RS datalayout to '%s'", __FUNCTION__, 152 target_machine->createDataLayout().getStringRepresentation().c_str()); 153 } 154 module.setTargetTriple(real_triple); 155 module.setDataLayout(target_machine->createDataLayout()); 156 } 157 return changed_module; 158 } 159 160 char RenderScriptRuntimeModulePass::ID = 0; 161 162 namespace lldb_private { 163 164 bool RenderScriptRuntime::GetOverrideExprOptions(clang::TargetOptions &proto) { 165 auto *process = GetProcess(); 166 assert(process); 167 return registerRSDefaultTargetOpts( 168 proto, process->GetTarget().GetArchitecture().GetMachine()); 169 } 170 171 bool RenderScriptRuntime::GetIRPasses(LLVMUserExpression::IRPasses &passes) { 172 if (!m_ir_passes) 173 m_ir_passes = new RSIRPasses(GetProcess()); 174 assert(m_ir_passes); 175 176 passes.EarlyPasses = m_ir_passes->EarlyPasses; 177 passes.LatePasses = m_ir_passes->LatePasses; 178 179 return true; 180 } 181 182 namespace lldb_renderscript { 183 184 RSIRPasses::RSIRPasses(Process *process) { 185 IRPasses(); 186 assert(process); 187 188 EarlyPasses = std::make_shared<llvm::legacy::PassManager>(); 189 assert(EarlyPasses); 190 EarlyPasses->add(new RenderScriptRuntimeModulePass(process)); 191 } 192 193 RSIRPasses::~RSIRPasses() {} 194 195 } // namespace lldb_renderscript 196 } // namespace lldb_private 197