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/Core/Log.h" 29 #include "lldb/Target/Process.h" 30 #include "lldb/Target/Target.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 42 // generating IR that has some assumptions that an ARM device is the target. 43 // As the IR is then compiled on a device of unknown (at time the IR was 44 // generated at least) architecture, 45 // when calling RenderScript API function as part of debugger expressions, we 46 // have to perform a fixup pass that 47 // removes those assumptions right before the module is sent to be generated by 48 // the llvm backend. 49 50 namespace { 51 bool registerRSDefaultTargetOpts(clang::TargetOptions &proto, 52 const llvm::Triple::ArchType &arch) { 53 switch (arch) { 54 case llvm::Triple::ArchType::x86: 55 proto.Triple = "i686--linux-android"; 56 proto.CPU = "atom"; 57 proto.Features.push_back("+long64"); 58 // Fallthrough for common x86 family features 59 case llvm::Triple::ArchType::x86_64: 60 proto.Features.push_back("+mmx"); 61 proto.Features.push_back("+sse"); 62 proto.Features.push_back("+sse2"); 63 proto.Features.push_back("+sse3"); 64 proto.Features.push_back("+ssse3"); 65 proto.Features.push_back("+sse4.1"); 66 proto.Features.push_back("+sse4.2"); 67 break; 68 case llvm::Triple::ArchType::mipsel: 69 // pretend this is `arm' for the front-end 70 proto.Triple = "armv7-none-linux-android"; 71 proto.CPU = ""; 72 proto.Features.push_back("+long64"); 73 break; 74 case llvm::Triple::ArchType::mips64el: 75 // pretend this is `aarch64' for the front-end 76 proto.Triple = "aarch64-none-linux-android"; 77 proto.CPU = ""; 78 break; 79 default: 80 return false; 81 } 82 return true; 83 } 84 } // end anonymous namespace 85 86 bool RenderScriptRuntimeModulePass::runOnModule(llvm::Module &module) { 87 bool changed_module = false; 88 Log *log( 89 GetLogIfAllCategoriesSet(LIBLLDB_LOG_LANGUAGE | LIBLLDB_LOG_EXPRESSIONS)); 90 91 std::string err; 92 llvm::StringRef real_triple = 93 m_process_ptr->GetTarget().GetArchitecture().GetTriple().getTriple(); 94 const llvm::Target *target_info = 95 llvm::TargetRegistry::lookupTarget(real_triple, err); 96 if (!target_info) { 97 if (log) 98 log->Warning("couldn't determine real target architecture: '%s'", 99 err.c_str()); 100 return false; 101 } 102 103 llvm::Optional<llvm::Reloc::Model> reloc_model = llvm::None; 104 assert(m_process_ptr && "no available lldb process"); 105 switch (m_process_ptr->GetTarget().GetArchitecture().GetMachine()) { 106 case llvm::Triple::ArchType::x86: 107 changed_module |= fixupX86FunctionCalls(module); 108 // For some reason this triple gets totally missed by the backend, and must 109 // be set manually. 110 // There a reference in bcc/Main.cpp about auto feature-detection being 111 // removed from LLVM3.5, but I can't 112 // see that discussion anywhere public. 113 real_triple = "i686--linux-android"; 114 break; 115 case llvm::Triple::ArchType::x86_64: 116 changed_module |= fixupX86_64FunctionCalls(module); 117 break; 118 case llvm::Triple::ArchType::mipsel: 119 case llvm::Triple::ArchType::mips64el: 120 // No actual IR fixup pass is needed on MIPS, but the datalayout 121 // and targetmachine do need to be explicitly set. 122 123 // bcc explicitly compiles MIPS code to use the static relocation 124 // model due to an issue with relocations in mclinker. 125 // see libbcc/support/CompilerConfig.cpp for details 126 reloc_model = llvm::Reloc::Static; 127 changed_module = true; 128 break; 129 case llvm::Triple::ArchType::arm: 130 case llvm::Triple::ArchType::aarch64: 131 // ARM subtargets need no fixup passes as they are the initial target as 132 // generated by the 133 // slang compiler frontend. 134 break; 135 default: 136 if (log) 137 log->Warning("Ignoring unknown renderscript target"); 138 return false; 139 } 140 141 if (changed_module) { 142 llvm::TargetOptions options; 143 llvm::TargetMachine *target_machine = target_info->createTargetMachine( 144 real_triple, "", "", options, reloc_model); 145 assert(target_machine && 146 "failed to identify RenderScriptRuntime target machine"); 147 // We've been using a triple and datalayout of some ARM variant all along, 148 // so 149 // we need to let the backend know that this is no longer the case. 150 if (log) { 151 log->Printf("%s - Changing RS target triple to '%s'", __FUNCTION__, 152 real_triple.str().c_str()); 153 log->Printf( 154 "%s - Changing RS datalayout to '%s'", __FUNCTION__, 155 target_machine->createDataLayout().getStringRepresentation().c_str()); 156 } 157 module.setTargetTriple(real_triple); 158 module.setDataLayout(target_machine->createDataLayout()); 159 } 160 return changed_module; 161 } 162 163 char RenderScriptRuntimeModulePass::ID = 0; 164 165 namespace lldb_private { 166 167 bool RenderScriptRuntime::GetOverrideExprOptions(clang::TargetOptions &proto) { 168 auto *process = GetProcess(); 169 assert(process); 170 return registerRSDefaultTargetOpts( 171 proto, process->GetTarget().GetArchitecture().GetMachine()); 172 } 173 174 bool RenderScriptRuntime::GetIRPasses(LLVMUserExpression::IRPasses &passes) { 175 if (!m_ir_passes) 176 m_ir_passes = new RSIRPasses(GetProcess()); 177 assert(m_ir_passes); 178 179 passes.EarlyPasses = m_ir_passes->EarlyPasses; 180 passes.LatePasses = m_ir_passes->LatePasses; 181 182 return true; 183 } 184 185 namespace lldb_renderscript { 186 187 RSIRPasses::RSIRPasses(Process *process) { 188 IRPasses(); 189 assert(process); 190 191 EarlyPasses = std::make_shared<llvm::legacy::PassManager>(); 192 assert(EarlyPasses); 193 EarlyPasses->add(new RenderScriptRuntimeModulePass(process)); 194 } 195 196 RSIRPasses::~RSIRPasses() {} 197 198 } // namespace lldb_renderscript 199 } // namespace lldb_private 200