[cDAC] Add GetTargetInfo DacDbi API

src/coreclr/debug/daccess/dacdbiimpl.cpp

@@ -7392,6 +7392,42 @@ HRESULT STDMETHODCALLTYPE DacDbiInterfaceImpl::GetGenericArgTokenIndex(VMPTR_Met
     return S_OK;
 }
 
+HRESULT STDMETHODCALLTYPE DacDbiInterfaceImpl::GetTargetInfo(OUT TargetInfo * pTargetInfo)
+{
+    DD_ENTER_MAY_THROW;
+
+    if (pTargetInfo == NULL)
+        return E_INVALIDARG;
+
+#if defined(TARGET_X86)
+    pTargetInfo->arch = kArchX86;
+#elif defined(TARGET_AMD64)
+    pTargetInfo->arch = kArchAMD64;
+#elif defined(TARGET_ARM)
+    pTargetInfo->arch = kArchArm;
+#elif defined(TARGET_ARM64)
+    pTargetInfo->arch = kArchArm64;
+#elif defined(TARGET_LOONGARCH64)
+    pTargetInfo->arch = kArchLoongArch64;
+#elif defined(TARGET_RISCV64)
+    pTargetInfo->arch = kArchRiscV64;
+#elif defined(TARGET_WASM)
+    pTargetInfo->arch = kArchWasm;
+#else
+    pTargetInfo->arch = kArchUnknown;
+#endif
+
+#if defined(TARGET_UNIX)
+    pTargetInfo->os = kOSUnix;
+#elif defined(TARGET_WINDOWS)
+    pTargetInfo->os = kOSWindows;
+#else
+    pTargetInfo->os = kOSUnknown;
+#endif
+
+    return S_OK;
+}
+
 DacRefWalker::DacRefWalker(ClrDataAccess *dac, BOOL walkStacks, UINT32 handleMask, BOOL resolvePointers)
     : mDac(dac), mWalkStacks(walkStacks), mHandleMask(handleMask), mStackWalker(NULL),
       mResolvePointers(resolvePointers), mHandleWalker(NULL)

src/coreclr/debug/daccess/dacdbiimpl.h

@@ -151,6 +151,8 @@ class DacDbiInterfaceImpl :
     HRESULT STDMETHODCALLTYPE EnumerateAsyncLocals(VMPTR_MethodDesc vmMethod, CORDB_ADDRESS codeAddr, UINT32 state, FP_ASYNC_LOCAL_CALLBACK fpCallback, CALLBACK_DATA pUserData);
     HRESULT STDMETHODCALLTYPE GetGenericArgTokenIndex(VMPTR_MethodDesc vmMethod, OUT UINT32* pIndex);
 
+    HRESULT STDMETHODCALLTYPE GetTargetInfo(OUT TargetInfo * pTargetInfo);
+
 private:
     void TypeHandleToExpandedTypeInfoImpl(AreValueTypesBoxed              boxed,
                                        TypeHandle                      typeHandle,

src/coreclr/debug/inc/dacdbiinterface.h

@@ -2203,6 +2203,34 @@ IDacDbiInterface : public IUnknown
         VMPTR_MethodDesc vmMethod,
         OUT UINT32* pTokenIndex) = 0;
 
+    typedef enum
+    {
+        kArchUnknown = 0,
+        kArchX86,
+        kArchAMD64,
+        kArchArm,
+        kArchArm64,
+        kArchLoongArch64,
+        kArchRiscV64,
+        kArchWasm,
+    } TargetArchitecture;
+
+    typedef enum
+    {
+        kOSUnknown = 0,
+        kOSWindows,
+        kOSUnix,
+    } TargetOperatingSystem;
+
+    struct TargetInfo
+    {
+        TargetArchitecture    arch;
+        TargetOperatingSystem os;
+    };
+
+    // Returns the target's processor architecture and OS family.
+    virtual HRESULT STDMETHODCALLTYPE GetTargetInfo(OUT TargetInfo * pTargetInfo) = 0;
+
     // The following tag tells the DD-marshalling tool to stop scanning.
     // END_MARSHAL
 

src/coreclr/inc/dacdbi.idl

@@ -129,6 +129,7 @@ typedef struct { void *pList; int nEntries; } DacDbiArrayList_CORDB_ADDRESS;
 typedef struct { void *pList; int nEntries; } DacDbiArrayList_GUID;
 typedef struct { void *pList; int nEntries; } DacDbiArrayList_COR_SEGMENT;
 typedef struct { void *pList; int nEntries; } DacDbiArrayList_COR_MEMORY_RANGE;
+typedef struct { int arch; int os; } TargetInfo;
 
 cpp_quote("#endif")
 
@@ -436,4 +437,7 @@ interface IDacDbiInterface : IUnknown
 
     // Generic Arg Token
     HRESULT GetGenericArgTokenIndex([in] VMPTR_MethodDesc vmMethod, [out] UINT32 * pTokenIndex);
+
+    // Returns the target's processor architecture and OS family.
+    HRESULT GetTargetInfo([out] struct TargetInfo * pTargetInfo);
 };

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/Dbi/DacDbiImpl.cs

@@ -5611,6 +5611,56 @@ public int GetGenericArgTokenIndex(ulong vmMethod, uint* pIndex)
         return hr;
     }
 
+    public int GetTargetInfo(TargetInfo* pTargetInfo)
+    {
+        int hr = HResults.S_OK;
+        try
+        {
+            if (pTargetInfo is null)
+                throw new ArgumentNullException(nameof(pTargetInfo));
+
+            Contracts.IRuntimeInfo runtimeInfo = _target.Contracts.RuntimeInfo;
+
+            pTargetInfo->Arch = runtimeInfo.GetTargetArchitecture() switch
+            {
+                Contracts.RuntimeInfoArchitecture.X86 => TargetArchitecture.X86,
+                Contracts.RuntimeInfoArchitecture.X64 => TargetArchitecture.AMD64,
+                Contracts.RuntimeInfoArchitecture.Arm => TargetArchitecture.Arm,
+                Contracts.RuntimeInfoArchitecture.Arm64 => TargetArchitecture.Arm64,
+                Contracts.RuntimeInfoArchitecture.LoongArch64 => TargetArchitecture.LoongArch64,
+                Contracts.RuntimeInfoArchitecture.RiscV64 => TargetArchitecture.RiscV64,
+                Contracts.RuntimeInfoArchitecture.Wasm => TargetArchitecture.Wasm,
+                _ => TargetArchitecture.Unknown,
+            };
+
+            pTargetInfo->OS = runtimeInfo.GetTargetOperatingSystem() switch
+            {
+                Contracts.RuntimeInfoOperatingSystem.Windows => TargetOperatingSystem.Windows,
+                Contracts.RuntimeInfoOperatingSystem.Unix => TargetOperatingSystem.Unix,
+                Contracts.RuntimeInfoOperatingSystem.Apple => TargetOperatingSystem.Unix,
+                _ => TargetOperatingSystem.Unknown,
+            };
+        }
+        catch (System.Exception ex)
+        {
+            hr = ex.HResult;
+        }
+#if DEBUG
+        if (_legacy is not null)
+        {
+            TargetInfo targetInfoLocal;
+            int hrLocal = _legacy.GetTargetInfo(&targetInfoLocal);
+            Debug.ValidateHResult(hr, hrLocal);
+            if (hr == HResults.S_OK)
+            {
+                Debug.Assert(pTargetInfo->Arch == targetInfoLocal.Arch, $"cDAC: {pTargetInfo->Arch}, DAC: {targetInfoLocal.Arch}");
+                Debug.Assert(pTargetInfo->OS == targetInfoLocal.OS, $"cDAC: {pTargetInfo->OS}, DAC: {targetInfoLocal.OS}");
+            }
+        }
+#endif
+        return hr;
+    }
+
     // Fills a DebuggerIPCE_ExpandedTypeData entry for a single type parameter, falling back to System.__Canon on failure.
     private void FillExpandedTypeDataWithCanonFallback(IRuntimeTypeSystem rts, TypeHandle typeHandle, TypeHandle thCanon, DebuggerIPCE_ExpandedTypeData* pTypeInfo)
     {

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/Dbi/IDacDbiInterface.cs

@@ -799,4 +799,32 @@ int EnumerateAsyncLocals(ulong vmMethod, ulong codeAddr, uint state,
 
     [PreserveSig]
     int GetGenericArgTokenIndex(ulong vmMethod, uint* pIndex);
+
+    [PreserveSig]
+    int GetTargetInfo(TargetInfo* pTargetInfo);
+}
+
+public enum TargetArchitecture
+{
+    Unknown = 0,
+    X86,
+    AMD64,
+    Arm,
+    Arm64,
+    LoongArch64,
+    RiscV64,
+    Wasm,
+}
+
+public enum TargetOperatingSystem
+{
+    Unknown = 0,
+    Windows,
+    Unix,
+}
+
+public struct TargetInfo
+{
+    public TargetArchitecture Arch;
+    public TargetOperatingSystem OS;
 }