1 files changed, 212 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Target/ABI.cpp b/contrib/llvm-project/lldb/source/Target/ABI.cpp
new file mode 100644
index 000000000000..28cd9aec665c
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Target/ABI.cpp
@@ -0,0 +1,212 @@
+//===-- ABI.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 "lldb/Target/ABI.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/Value.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/Expression/ExpressionVariable.h"
+#include "lldb/Symbol/CompilerType.h"
+#include "lldb/Symbol/TypeSystem.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Thread.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+ABISP
+ABI::FindPlugin(lldb::ProcessSP process_sp, const ArchSpec &arch) {
+  ABISP abi_sp;
+  ABICreateInstance create_callback;
+
+  for (uint32_t idx = 0;
+       (create_callback = PluginManager::GetABICreateCallbackAtIndex(idx)) !=
+       nullptr;
+       ++idx) {
+    abi_sp = create_callback(process_sp, arch);
+
+    if (abi_sp)
+      return abi_sp;
+  }
+  abi_sp.reset();
+  return abi_sp;
+}
+
+ABI::~ABI() = default;
+
+bool ABI::GetRegisterInfoByName(ConstString name, RegisterInfo &info) {
+  uint32_t count = 0;
+  const RegisterInfo *register_info_array = GetRegisterInfoArray(count);
+  if (register_info_array) {
+    const char *unique_name_cstr = name.GetCString();
+    uint32_t i;
+    for (i = 0; i < count; ++i) {
+      if (register_info_array[i].name == unique_name_cstr) {
+        info = register_info_array[i];
+        return true;
+      }
+    }
+    for (i = 0; i < count; ++i) {
+      if (register_info_array[i].alt_name == unique_name_cstr) {
+        info = register_info_array[i];
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+bool ABI::GetRegisterInfoByKind(RegisterKind reg_kind, uint32_t reg_num,
+                                RegisterInfo &info) {
+  if (reg_kind < eRegisterKindEHFrame || reg_kind >= kNumRegisterKinds)
+    return false;
+
+  uint32_t count = 0;
+  const RegisterInfo *register_info_array = GetRegisterInfoArray(count);
+  if (register_info_array) {
+    for (uint32_t i = 0; i < count; ++i) {
+      if (register_info_array[i].kinds[reg_kind] == reg_num) {
+        info = register_info_array[i];
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+ValueObjectSP ABI::GetReturnValueObject(Thread &thread, CompilerType &ast_type,
+                                        bool persistent) const {
+  if (!ast_type.IsValid())
+    return ValueObjectSP();
+
+  ValueObjectSP return_valobj_sp;
+
+  return_valobj_sp = GetReturnValueObjectImpl(thread, ast_type);
+  if (!return_valobj_sp)
+    return return_valobj_sp;
+
+  // Now turn this into a persistent variable.
+  // FIXME: This code is duplicated from Target::EvaluateExpression, and it is
+  // used in similar form in a couple
+  // of other places.  Figure out the correct Create function to do all this
+  // work.
+
+  if (persistent) {
+    Target &target = *thread.CalculateTarget();
+    PersistentExpressionState *persistent_expression_state =
+        target.GetPersistentExpressionStateForLanguage(
+            ast_type.GetMinimumLanguage());
+
+    if (!persistent_expression_state)
+      return ValueObjectSP();
+
+    auto prefix = persistent_expression_state->GetPersistentVariablePrefix();
+    ConstString persistent_variable_name =
+        persistent_expression_state->GetNextPersistentVariableName(target,
+                                                                   prefix);
+
+    lldb::ValueObjectSP const_valobj_sp;
+
+    // Check in case our value is already a constant value
+    if (return_valobj_sp->GetIsConstant()) {
+      const_valobj_sp = return_valobj_sp;
+      const_valobj_sp->SetName(persistent_variable_name);
+    } else
+      const_valobj_sp =
+          return_valobj_sp->CreateConstantValue(persistent_variable_name);
+
+    lldb::ValueObjectSP live_valobj_sp = return_valobj_sp;
+
+    return_valobj_sp = const_valobj_sp;
+
+    ExpressionVariableSP expr_variable_sp(
+        persistent_expression_state->CreatePersistentVariable(
+            return_valobj_sp));
+
+    assert(expr_variable_sp);
+
+    // Set flags and live data as appropriate
+
+    const Value &result_value = live_valobj_sp->GetValue();
+
+    switch (result_value.GetValueType()) {
+    case Value::eValueTypeHostAddress:
+    case Value::eValueTypeFileAddress:
+      // we don't do anything with these for now
+      break;
+    case Value::eValueTypeScalar:
+    case Value::eValueTypeVector:
+      expr_variable_sp->m_flags |=
+          ExpressionVariable::EVIsFreezeDried;
+      expr_variable_sp->m_flags |=
+          ExpressionVariable::EVIsLLDBAllocated;
+      expr_variable_sp->m_flags |=
+          ExpressionVariable::EVNeedsAllocation;
+      break;
+    case Value::eValueTypeLoadAddress:
+      expr_variable_sp->m_live_sp = live_valobj_sp;
+      expr_variable_sp->m_flags |=
+          ExpressionVariable::EVIsProgramReference;
+      break;
+    }
+
+    return_valobj_sp = expr_variable_sp->GetValueObject();
+  }
+  return return_valobj_sp;
+}
+
+ValueObjectSP ABI::GetReturnValueObject(Thread &thread, llvm::Type &ast_type,
+                                        bool persistent) const {
+  ValueObjectSP return_valobj_sp;
+  return_valobj_sp = GetReturnValueObjectImpl(thread, ast_type);
+  return return_valobj_sp;
+}
+
+// specialized to work with llvm IR types
+//
+// for now we will specify a default implementation so that we don't need to
+// modify other ABIs
+lldb::ValueObjectSP ABI::GetReturnValueObjectImpl(Thread &thread,
+                                                  llvm::Type &ir_type) const {
+  ValueObjectSP return_valobj_sp;
+
+  /* this is a dummy and will only be called if an ABI does not override this */
+
+  return return_valobj_sp;
+}
+
+bool ABI::PrepareTrivialCall(Thread &thread, lldb::addr_t sp,
+                             lldb::addr_t functionAddress,
+                             lldb::addr_t returnAddress, llvm::Type &returntype,
+                             llvm::ArrayRef<ABI::CallArgument> args) const {
+  // dummy prepare trivial call
+  llvm_unreachable("Should never get here!");
+}
+
+bool ABI::GetFallbackRegisterLocation(
+    const RegisterInfo *reg_info,
+    UnwindPlan::Row::RegisterLocation &unwind_regloc) {
+  // Did the UnwindPlan fail to give us the caller's stack pointer? The stack
+  // pointer is defined to be the same as THIS frame's CFA, so return the CFA
+  // value as the caller's stack pointer.  This is true on x86-32/x86-64 at
+  // least.
+  if (reg_info->kinds[eRegisterKindGeneric] == LLDB_REGNUM_GENERIC_SP) {
+    unwind_regloc.SetIsCFAPlusOffset(0);
+    return true;
+  }
+
+  // If a volatile register is being requested, we don't want to forward the
+  // next frame's register contents up the stack -- the register is not
+  // retrievable at this frame.
+  if (RegisterIsVolatile(reg_info)) {
+    unwind_regloc.SetUndefined();
+    return true;
+  }
+
+  return false;
+}