1 files changed, 191 insertions, 0 deletions
diff --git a/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptExpressionOpts.cpp b/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptExpressionOpts.cpp
new file mode 100644
index 000000000000..b396781e6726
--- /dev/null
+++ b/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptExpressionOpts.cpp
@@ -0,0 +1,191 @@
+//===-- RenderScriptExpressionOpts.cpp --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <string>
+
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+
+#include "clang/Basic/TargetOptions.h"
+
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/Log.h"
+
+#include "RenderScriptExpressionOpts.h"
+#include "RenderScriptRuntime.h"
+#include "RenderScriptx86ABIFixups.h"
+
+using namespace lldb_private;
+using namespace lldb_renderscript;
+
+// [``slang``](https://android.googlesource.com/platform/frameworks/compile/slang),
+// the compiler frontend for RenderScript embeds an ARM specific triple in IR
+// that is shipped in the app, after generating IR that has some assumptions
+// that an ARM device is the target. As the IR is then compiled on a device of
+// unknown (at time the IR was generated at least) architecture, when calling
+// RenderScript API function as part of debugger expressions, we have to
+// perform a fixup pass that removes those assumptions right before the module
+// is sent to be generated by the llvm backend.
+
+namespace {
+bool registerRSDefaultTargetOpts(clang::TargetOptions &proto,
+                                 const llvm::Triple::ArchType &arch) {
+  switch (arch) {
+  case llvm::Triple::ArchType::x86:
+    proto.Triple = "i686--linux-android";
+    proto.CPU = "atom";
+    proto.Features.push_back("+long64");
+    // Fallthrough for common x86 family features
+    LLVM_FALLTHROUGH;
+  case llvm::Triple::ArchType::x86_64:
+    proto.Features.push_back("+mmx");
+    proto.Features.push_back("+sse");
+    proto.Features.push_back("+sse2");
+    proto.Features.push_back("+sse3");
+    proto.Features.push_back("+ssse3");
+    proto.Features.push_back("+sse4.1");
+    proto.Features.push_back("+sse4.2");
+    break;
+  case llvm::Triple::ArchType::mipsel:
+    // pretend this is `arm' for the front-end
+    proto.Triple = "armv7-none-linux-android";
+    proto.CPU = "";
+    proto.Features.push_back("+long64");
+    break;
+  case llvm::Triple::ArchType::mips64el:
+    // pretend this is `aarch64' for the front-end
+    proto.Triple = "aarch64-none-linux-android";
+    proto.CPU = "";
+    break;
+  default:
+    return false;
+  }
+  return true;
+}
+} // end anonymous namespace
+
+bool RenderScriptRuntimeModulePass::runOnModule(llvm::Module &module) {
+  bool changed_module = false;
+  Log *log(
+      GetLogIfAllCategoriesSet(LIBLLDB_LOG_LANGUAGE | LIBLLDB_LOG_EXPRESSIONS));
+
+  std::string err;
+  llvm::StringRef real_triple =
+      m_process_ptr->GetTarget().GetArchitecture().GetTriple().getTriple();
+  const llvm::Target *target_info =
+      llvm::TargetRegistry::lookupTarget(real_triple, err);
+  if (!target_info) {
+    if (log)
+      log->Warning("couldn't determine real target architecture: '%s'",
+                   err.c_str());
+    return false;
+  }
+
+  llvm::Optional<llvm::Reloc::Model> reloc_model = llvm::None;
+  assert(m_process_ptr && "no available lldb process");
+  switch (m_process_ptr->GetTarget().GetArchitecture().GetMachine()) {
+  case llvm::Triple::ArchType::x86:
+    changed_module |= fixupX86FunctionCalls(module);
+    // For some reason this triple gets totally missed by the backend, and must
+    // be set manually. There a reference in bcc/Main.cpp about auto feature-
+    // detection being removed from LLVM3.5, but I can't see that discussion
+    // anywhere public.
+    real_triple = "i686--linux-android";
+    break;
+  case llvm::Triple::ArchType::x86_64:
+    changed_module |= fixupX86_64FunctionCalls(module);
+    break;
+  case llvm::Triple::ArchType::mipsel:
+  case llvm::Triple::ArchType::mips64el:
+    // No actual IR fixup pass is needed on MIPS, but the datalayout and
+    // targetmachine do need to be explicitly set.
+
+    // bcc explicitly compiles MIPS code to use the static relocation model due
+    // to an issue with relocations in mclinker. see
+    // libbcc/support/CompilerConfig.cpp for details
+    reloc_model = llvm::Reloc::Static;
+    changed_module = true;
+    break;
+  case llvm::Triple::ArchType::arm:
+  case llvm::Triple::ArchType::aarch64:
+    // ARM subtargets need no fixup passes as they are the initial target as
+    // generated by the
+    // slang compiler frontend.
+    break;
+  default:
+    if (log)
+      log->Warning("Ignoring unknown renderscript target");
+    return false;
+  }
+
+  if (changed_module) {
+    llvm::TargetOptions options;
+    llvm::TargetMachine *target_machine = target_info->createTargetMachine(
+        real_triple, "", "", options, reloc_model);
+    assert(target_machine &&
+           "failed to identify RenderScriptRuntime target machine");
+    // We've been using a triple and datalayout of some ARM variant all along,
+    // so we need to let the backend know that this is no longer the case.
+    if (log) {
+      LLDB_LOGF(log, "%s - Changing RS target triple to '%s'", __FUNCTION__,
+                real_triple.str().c_str());
+      LLDB_LOGF(
+          log, "%s - Changing RS datalayout to '%s'", __FUNCTION__,
+          target_machine->createDataLayout().getStringRepresentation().c_str());
+    }
+    module.setTargetTriple(real_triple);
+    module.setDataLayout(target_machine->createDataLayout());
+  }
+  return changed_module;
+}
+
+char RenderScriptRuntimeModulePass::ID = 0;
+
+namespace lldb_private {
+
+bool RenderScriptRuntime::GetOverrideExprOptions(clang::TargetOptions &proto) {
+  auto *process = GetProcess();
+  assert(process);
+  return registerRSDefaultTargetOpts(
+      proto, process->GetTarget().GetArchitecture().GetMachine());
+}
+
+bool RenderScriptRuntime::GetIRPasses(LLVMUserExpression::IRPasses &passes) {
+  if (!m_ir_passes)
+    m_ir_passes = new RSIRPasses(GetProcess());
+  assert(m_ir_passes);
+
+  passes.EarlyPasses = m_ir_passes->EarlyPasses;
+  passes.LatePasses = m_ir_passes->LatePasses;
+
+  return true;
+}
+
+namespace lldb_renderscript {
+
+RSIRPasses::RSIRPasses(Process *process) {
+  IRPasses();
+  assert(process);
+
+  EarlyPasses = std::make_shared<llvm::legacy::PassManager>();
+  assert(EarlyPasses);
+  EarlyPasses->add(new RenderScriptRuntimeModulePass(process));
+}
+
+RSIRPasses::~RSIRPasses() {}
+
+} // namespace lldb_renderscript
+} // namespace lldb_private