[NFC][RemoteInspection] Add an opaque AddressSpace field to RemoteAddress

include/swift/Basic/RelativePointer.h

@@ -132,7 +132,10 @@
 #ifndef SWIFT_BASIC_RELATIVEPOINTER_H
 #define SWIFT_BASIC_RELATIVEPOINTER_H
 
+#include <cassert>
 #include <cstdint>
+#include <type_traits>
+#include <utility>
 
 namespace swift {
 

include/swift/Remote/CMemoryReader.h

@@ -69,7 +69,7 @@ class CMemoryReader final : public MemoryReader {
   // that we're likely failing to strip a signed pointer when reading from it.
   bool hasSignatureBits(RemoteAddress address) {
     return false;
-    uint64_t addressData = address.getAddressData();
+    uint64_t addressData = address.getRawAddress();
     return addressData != (addressData & getPtrauthMask());
   }
 
@@ -89,13 +89,12 @@ class CMemoryReader final : public MemoryReader {
   RemoteAddress getSymbolAddress(const std::string &name) override {
     auto addressData = Impl.getSymbolAddress(Impl.reader_context,
                                              name.c_str(), name.size());
-    return RemoteAddress(addressData);
+    return RemoteAddress(addressData, RemoteAddress::DefaultAddressSpace);
   }
 
   uint64_t getStringLength(RemoteAddress address) {
     assert(!hasSignatureBits(address));
-    return Impl.getStringLength(Impl.reader_context,
-                                address.getAddressData());
+    return Impl.getStringLength(Impl.reader_context, address.getRawAddress());
   }
 
   bool readString(RemoteAddress address, std::string &dest) override {
@@ -120,7 +119,7 @@ class CMemoryReader final : public MemoryReader {
   ReadBytesResult readBytes(RemoteAddress address, uint64_t size) override {
     assert(!hasSignatureBits(address));
     void *FreeContext;
-    auto Ptr = Impl.readBytes(Impl.reader_context, address.getAddressData(),
+    auto Ptr = Impl.readBytes(Impl.reader_context, address.getRawAddress(),
                               size, &FreeContext);
 
     auto Free = Impl.free;
@@ -134,8 +133,7 @@ class CMemoryReader final : public MemoryReader {
     return ReadBytesResult(Ptr, freeLambda);
   }
 };
-
-}
-}
+} // namespace remote
+} // namespace swift
 
 #endif

include/swift/Remote/Failure.h

@@ -288,7 +288,7 @@ class Failure {
       case ArgStorageKind::Address: {
         result += '0';
         result += 'x';
-        uint64_t address = Args[argIndex].Address.getAddressData();
+        uint64_t address = Args[argIndex].Address.getRawAddress();
         unsigned max = ((address >> 32) != 0 ? 16 : 8);
         for (unsigned i = 0; i != max; ++i) {
           result += "0123456789abcdef"[(address >> (max - 1 - i) * 4) & 0xF];

include/swift/Remote/InProcessMemoryReader.h

@@ -105,8 +105,8 @@ class InProcessMemoryReader final : public MemoryReader {
     return ReadBytesResult(address.getLocalPointer<void>(), [](const void *) {});
   }
 };
- 
-}
-}
+
+} // namespace remote
+} // namespace swift
 
 #endif

include/swift/Remote/MemoryReader.h

@@ -57,13 +57,31 @@ class MemoryReader {
   ///
   /// Returns false if the operation failed.
   virtual bool readString(RemoteAddress address, std::string &dest) = 0;
-
+
+  /// Attempts to read a remote address from the given address in the remote
+  /// process.
+  ///
+  /// Returns false if the operator failed.
+  template <typename IntegerType>
+  bool readRemoteAddress(RemoteAddress address, RemoteAddress &out) {
+    IntegerType buf;
+    if (!readInteger(address, &buf))
+      return false;
+
+    out = RemoteAddress((uint64_t)buf, address.getAddressSpace());
+    return true;
+  }
+
   /// Attempts to read an integer from the given address in the remote
   /// process.
   ///
   /// Returns false if the operation failed.
   template <typename IntegerType>
   bool readInteger(RemoteAddress address, IntegerType *dest) {
+    static_assert(!std::is_same<RemoteAddress, IntegerType>(),
+                  "RemoteAddress cannot be read in directly, use "
+                  "readRemoteAddress instead.");
+
     return readBytes(address, reinterpret_cast<uint8_t*>(dest),
                      sizeof(IntegerType));
   }
@@ -147,7 +165,8 @@ class MemoryReader {
   virtual RemoteAbsolutePointer resolvePointer(RemoteAddress address,
                                                uint64_t readValue) {
     // Default implementation returns the read value as is.
-    return RemoteAbsolutePointer("", readValue);
+    return RemoteAbsolutePointer(
+        RemoteAddress(readValue, address.getAddressSpace()));
   }
 
   /// Performs the inverse operation of \ref resolvePointer.
@@ -166,7 +185,7 @@ class MemoryReader {
   virtual RemoteAbsolutePointer getSymbol(RemoteAddress address) {
     if (auto symbol = resolvePointerAsSymbol(address))
       return *symbol;
-    return RemoteAbsolutePointer("", address.getAddressData());
+    return RemoteAbsolutePointer(address);
   }
 
   /// Lookup a dynamic symbol name (ie dynamic loader binding) for the given
@@ -263,7 +282,7 @@ class MemoryReader {
   virtual ~MemoryReader() = default;
 };
 
-} // end namespace reflection
+} // end namespace remote
 } // end namespace swift
 
 #endif // SWIFT_REFLECTION_READER_H