[cDAC] implement GetRuntimeNameByAddress

docs/design/datacontracts/ExecutionManager.md

@@ -27,8 +27,6 @@ struct CodeBlockHandle
     TargetCodePointer GetFuncletStartAddress(CodeBlockHandle codeInfoHandle);
     // Get the method region info (hot and cold code size, and cold code start address)
     void GetMethodRegionInfo(CodeBlockHandle codeInfoHandle, out uint hotSize, out TargetPointer coldStart, out uint coldSize);
-    // Get the JIT type
-    JitType GetJITType(CodeBlockHandle codeInfoHandle);
     // Attempt to get the method desc of an entrypoint
     TargetPointer NonVirtualEntry2MethodDesc(TargetCodePointer entrypoint);
 
@@ -58,6 +56,9 @@ struct CodeBlockHandle
     // Returns true if the code block is specifically a filter funclet
     bool IsFilterFunclet(CodeBlockHandle codeInfoHandle);
 
+    // Classify a code address as a known code kind (jitted, ReadyToRun, stub, etc.).
+    // Returns Unknown if the address is not recognized.
+    CodeKind GetCodeKind(TargetCodePointer codeAddress);
     // Finds the ReadyToRun module that contains the given address.
     TargetPointer FindReadyToRunModule(TargetPointer address);
 ```
@@ -122,6 +123,23 @@ public struct ExceptionClauseInfo
     public TargetNUInt? TypeHandle;
     public TargetPointer? ModuleAddr;
 }
+
+public enum CodeKind : uint
+{
+    Unknown = 0,
+    JumpStub = 1,
+    DynamicHelper = 2,
+    StubPrecode = 3,
+    FixupPrecode = 4,
+    VSD_DispatchStub = 5,
+    VSD_ResolveStub = 6,
+    VSD_LookupStub = 7,
+    VSD_VTableStub = 8,
+    CallCountingStub = 9,
+    MethodCallThunk = 10,
+    Jitted = 11,
+    ReadyToRun = 12
+}
 ```
 
 ## Version 1
@@ -146,6 +164,8 @@ Data descriptors used:
 | `RangeSection` | `Flags` | Flags for the range section |
 | `RangeSection` | `HeapList` | Pointer to the heap list |
 | `RangeSection` | `R2RModule` | ReadyToRun module |
+| `RangeSection` | `RangeList` | Pointer to the `CodeRangeMapRangeList` associated with this range section |
+| `CodeRangeMapRangeList` | `RangeListType` | Integer identifying the stub code block kind for this range list |
 | `CodeHeapListNode` | `Next` | Next node |
 | `CodeHeapListNode` | `StartAddress` | Start address of the used portion of the code heap |
 | `CodeHeapListNode` | `EndAddress` | End address of the used portion of the code heap |
@@ -387,15 +407,6 @@ public override void GetMethodRegionInfo(RangeSection rangeSection, TargetCodePo
 
 ```
 
-`GetJITType` returns the JIT type by finding the JIT manager for the data range containing the relevant code block. We return `Jit` for the `EEJitManager`, `R2R` for the `R2RJitManager`, and `Unknown` for any other value.
-```csharp
-public enum JitType : uint
-{
-    Unknown = 0,
-    Jit = 1,
-    R2R = 2
-};
-```
 `NonVirtualEntry2MethodDesc` attempts to find a method desc from an entrypoint. If portable entrypoints are enabled, we attempt to read the entrypoint data structure to find the method table. We also attempt to find the method desc from a precode stub. Finally, we attempt to find the method desc using `GetMethodInfo` as described above.
 ```csharp
 TargetPointer IExecutionManager.NonVirtualEntry2MethodDesc(TargetCodePointer entrypoint)
@@ -504,6 +515,7 @@ After obtaining the clause array bounds, the common iteration logic classifies e
 
 `IsFilterFunclet` first checks `IsFunclet`. If the code block is a funclet, it retrieves the EH clauses for the method and checks whether any filter clause's handler offset matches the funclet's relative offset. If a match is found, the funclet is a filter funclet.
 
+`GetCodeKind` classifies a code address by finding its owning range section and determining the code kind. It distinguishes between jitted code, stub code blocks (jump stubs, precode stubs, VSD stubs, etc.), and ReadyToRun code. Returns `Unknown` if the address cannot be classified.
 ### FindReadyToRunModule
 
 `FindReadyToRunModule` locates the ReadyToRun module whose PE image contains the given address. Unlike `GetCodeBlockHandle` (which only matches code regions), this API matches against the full PE image range - including data sections such as import tables. This is used in GCRefMap resolution as it requires finding the module that owns an import section indirection address, which is in the data section rather than the code section.

docs/design/datacontracts/PrecodeStubs.md

@@ -7,6 +7,10 @@ This contract provides support for examining [precode](../coreclr/botr/method-de
 ```csharp
     // Gets a pointer to the MethodDesc for a given stub entrypoint
     TargetPointer GetMethodDescFromStubAddress(TargetCodePointer entryPoint);
+
+    // Given an interior address within a precode stub and the kind of stub (StubPrecode or FixupPrecode),
+    // computes the entry point of the precode.
+    TargetPointer GetPrecodeEntryPointFromInteriorAddress(TargetCodePointer interiorAddress, bool isFixupPrecode);
 ```
 
 ## Version 1, 2, and 3
@@ -296,3 +300,32 @@ After the initial precode type is determined, for stub precodes a refined precod
         return precode.GetMethodDesc(_target, MachineDescriptor);
     }
 ```
+
+### `GetPrecodeEntryPointFromInteriorAddress`
+
+Given an interior address within a precode stub and the kind of stub (StubPrecode or FixupPrecode),
+computes the entry point of the precode.
+
+```csharp
+    TargetPointer IPrecodeStubs.GetPrecodeEntryPointFromInteriorAddress(TargetCodePointer interiorAddress, bool isFixupPrecode)
+    {
+        TargetPointer instrPointer = CodePointerReadableInstrPointer(interiorAddress);
+
+        uint stubSize;
+        if (isFixupPrecode)
+        {
+            stubSize = MachineDescriptor.FixupStubPrecodeSize;
+        }
+        else
+        {
+            stubSize = MachineDescriptor.StubPrecodeSize;
+        }
+
+        ulong pageMask = MachineDescriptor.StubCodePageSize - 1;
+        ulong pageBase = instrPointer.Value & ~pageMask;
+        ulong offset = instrPointer.Value - pageBase;
+        ulong entryPointAddress = pageBase + (offset / stubSize) * stubSize;
+
+        return new TargetPointer(entryPointAddress);
+    }
+```

src/coreclr/debug/daccess/daccess.cpp

@@ -5309,86 +5309,6 @@ ClrDataAccess::GetJitHelperName(IN TADDR address)
     return NULL;
 }
 
-// This function expects more memory than maybe needed.
-static int FormatCLRStubName(
-    _In_opt_z_ LPCWSTR stubNameMaybe,
-    _In_ TADDR stubAddr,
-    _In_ ULONG32 bufLen,
-    _Out_ ULONG32 *symbolLen,
-    _Out_writes_bytes_opt_(bufLen) WCHAR* symbolBuf)
-{
-    // Parts needed to construct a name:
-    // With stub manager name: "CLRStub[%s]@%p"
-    //   No stub manager name: "CLRStub@%p"
-    const WCHAR formatName_Prefix[] = W("CLRStub");
-    const WCHAR formatName_OpenBracket[] = W("[");
-    const WCHAR formatName_CloseBracket[] = W("]");
-    const WCHAR formatName_PrefixEnd[] = W("@");
-
-    // Compute the address as a string safely.
-    WCHAR addrString[Max64BitHexString + 1];
-    FormatInteger(addrString, ARRAY_SIZE(addrString), "%p", stubAddr);
-    size_t addStringLen = u16_strlen(addrString);
-
-    // Compute maximum length, include the null terminator.
-    size_t formatName_MaxLen = ARRAY_SIZE(formatName_Prefix) // Include trailing null
-                                + ARRAY_SIZE(formatName_PrefixEnd) - 1
-                                + addStringLen;
-
-    // Consider stub manager name
-    size_t stubManagedNameLen = 0;
-    if (stubNameMaybe != NULL)
-    {
-        stubManagedNameLen = u16_strlen(stubNameMaybe);
-        formatName_MaxLen += ARRAY_SIZE(formatName_OpenBracket) - 1;
-        formatName_MaxLen += ARRAY_SIZE(formatName_CloseBracket) - 1;
-    }
-
-    HRESULT hr = S_FALSE;
-
-    // Compute the exact length needed.
-    const size_t lenNeeded = formatName_MaxLen + stubManagedNameLen;
-    if (lenNeeded <= bufLen)
-    {
-        size_t written = 0;
-
-        // Set the prefix
-        wcscpy_s(symbolBuf, bufLen - written, formatName_Prefix);
-        written += ARRAY_SIZE(formatName_Prefix) - 1;
-
-        // Add the name
-        if (stubManagedNameLen > 0)
-        {
-            wcscat_s(symbolBuf, bufLen - written, formatName_OpenBracket);
-            written += ARRAY_SIZE(formatName_OpenBracket) - 1;
-            wcscat_s(symbolBuf, bufLen - written, stubNameMaybe);
-            written += stubManagedNameLen;
-            wcscat_s(symbolBuf, bufLen - written, formatName_CloseBracket);
-            written += ARRAY_SIZE(formatName_CloseBracket) - 1;
-        }
-
-        // Append the prefix end
-        wcscat_s(symbolBuf, bufLen - written, formatName_PrefixEnd);
-        written += ARRAY_SIZE(formatName_PrefixEnd) - 1;
-
-        // Append the address
-        wcscat_s(symbolBuf, bufLen - written, addrString);
-        written += addStringLen;
-
-        hr = S_OK;
-    }
-
-    if (symbolLen)
-    {
-        if (!FitsIn<ULONG32>(lenNeeded))
-            return COR_E_OVERFLOW;
-
-        *symbolLen = (ULONG32)lenNeeded;
-    }
-
-    return hr;
-}
-
 HRESULT
 ClrDataAccess::RawGetMethodName(
     /* [in] */ CLRDATA_ADDRESS address,
@@ -5424,51 +5344,42 @@ ClrDataAccess::RawGetMethodName(
     PTR_StubManager pStubManager;
     MethodDesc* methodDesc = NULL;
 
-    {
-        EECodeInfo codeInfo(GetInterpreterCodeFromEntryPointIfPresent(TO_TADDR(address)));
-        if (codeInfo.IsValid())
-        {
-            if (displacement)
-            {
-                *displacement = codeInfo.GetRelOffset();
-            }
-
-            methodDesc = codeInfo.GetMethodDesc();
-            goto NameFromMethodDesc;
-        }
-    }
-
     pStubManager = StubManager::FindStubManager(TO_TADDR(address));
     if (pStubManager != NULL)
     {
-        if (displacement)
-        {
-            *displacement = 0;
-        }
-
-        //
-        // Special-cased stub managers
-        //
         if (pStubManager == PrecodeStubManager::g_pManager)
         {
-            PCODE alignedAddress = AlignDown(TO_TADDR(address), PRECODE_ALIGNMENT);
+            StubCodeBlockKind stubKind = RangeSectionStubManager::GetStubKind(TO_TADDR(address));
+            SIZE_T stubSize = 0;
 
-#ifdef TARGET_ARM
-            alignedAddress += THUMB_CODE;
+            switch (stubKind)
+            {
+            case STUB_CODE_BLOCK_STUBPRECODE:
+                stubSize = StubPrecode::CodeSize;
+                break;
+#ifdef HAS_FIXUP_PRECODE
+            case STUB_CODE_BLOCK_FIXUPPRECODE:
+                stubSize = FixupPrecode::CodeSize;
+                break;
 #endif
+            default:
+                break;
+            }
 
-            SIZE_T maxPrecodeSize = sizeof(StubPrecode);
+            if (stubSize != 0)
+            {
+                const SIZE_T pageMask = GetStubCodePageSize() - 1;
+                const TADDR pageBase = TO_TADDR(address) & ~static_cast<TADDR>(pageMask);
+                const SIZE_T offset = static_cast<SIZE_T>(TO_TADDR(address) - pageBase);
+                PCODE precodeAddress = pageBase + (offset / stubSize) * stubSize;
 
-#ifdef HAS_THISPTR_RETBUF_PRECODE
-            maxPrecodeSize = max((size_t)maxPrecodeSize, sizeof(ThisPtrRetBufPrecode));
+#ifdef TARGET_ARM
+                precodeAddress += THUMB_CODE;
 #endif
 
-            for (SIZE_T i = 0; i < maxPrecodeSize / PRECODE_ALIGNMENT; i++)
-            {
                 EX_TRY
                 {
-                    // Try to find matching precode entrypoint
-                    Precode* pPrecode = Precode::GetPrecodeFromEntryPoint(alignedAddress, TRUE);
+                    Precode* pPrecode = Precode::GetPrecodeFromEntryPoint(precodeAddress, TRUE);
                     if (pPrecode != NULL && pPrecode->GetType() != PRECODE_UMENTRY_THUNK)
                     {
                         methodDesc = pPrecode->GetMethodDesc();
@@ -5478,64 +5389,64 @@ ClrDataAccess::RawGetMethodName(
                             {
                                 if (displacement)
                                 {
-                                    *displacement = TO_TADDR(address) - PCODEToPINSTR(alignedAddress);
+                                    *displacement = TO_TADDR(address) - PCODEToPINSTR(precodeAddress);
                                 }
-                                goto NameFromMethodDesc;
+                                return GetFullMethodName(methodDesc, bufLen, symbolLen, symbolBuf);
                             }
                         }
                     }
-                    alignedAddress -= PRECODE_ALIGNMENT;
                 }
                 EX_CATCH
                 {
                 }
                 EX_END_CATCH
             }
         }
-
         LPCWSTR wszStubManagerName = pStubManager->GetStubManagerName(TO_TADDR(address));
         _ASSERTE(wszStubManagerName != NULL);
-
-        return FormatCLRStubName(
-            wszStubManagerName,
-            TO_TADDR(address),
-            bufLen,
-            symbolLen,
-            symbolBuf);
+        if (u16_strcmp(wszStubManagerName, W("ThePreStub")) != 0 && u16_strcmp(wszStubManagerName, W("InteropDispatchStub")) != 0 && u16_strcmp(wszStubManagerName, W("TailCallStub")) != 0)
+        {
+            // Skip the stubs that are just assembly helpers.
+            size_t nameLen = u16_strlen(wszStubManagerName) + 1; // include null terminator
+            if (symbolLen)
+            {
+                if (!FitsIn<ULONG32>(nameLen))
+                    return COR_E_OVERFLOW;
+                *symbolLen = (ULONG32)nameLen;
+            }
+            if (symbolBuf && bufLen >= nameLen)
+            {
+                wcscpy_s(symbolBuf, bufLen, wszStubManagerName);
+            }
+            else if (symbolBuf)
+            {
+                return S_FALSE;
+            }
+            if (displacement)
+            {
+                *displacement = 0;
+            }
+            return S_OK;
+        }
     }
 
     // Do not waste time looking up name for static helper. Debugger can get the actual name from .pdb.
     PCSTR pHelperName;
     pHelperName = GetJitHelperName(TO_TADDR(address));
     if (pHelperName != NULL)
     {
-        if (displacement)
-        {
-            *displacement = 0;
-        }
-
         HRESULT hr = ConvertUtf8(pHelperName, bufLen, symbolLen, symbolBuf);
         if (FAILED(hr))
             return S_FALSE;
 
+        if (displacement)
+        {
+            *displacement = 0;
+        }
         return S_OK;
     }
 
     return E_NOINTERFACE;
-
-NameFromMethodDesc:
-    if (methodDesc->GetClassification() == mcDynamic
-        && methodDesc->GetSigParser().IsNull())
-    {
-        return FormatCLRStubName(
-            NULL,
-            TO_TADDR(address),
-            bufLen,
-            symbolLen,
-            symbolBuf);
-    }
-
-    return GetFullMethodName(methodDesc, bufLen, symbolLen, symbolBuf);
 }
 
 HRESULT

src/coreclr/vm/codeman.cpp

@@ -4728,9 +4728,9 @@ StubCodeBlockKind EEJitManager::GetStubCodeBlockKind(RangeSection * pRangeSectio
 
     TADDR start = dac_cast<PTR_EEJitManager>(pRangeSection->_pjit)->FindMethodCode(pRangeSection, currentPC);
     if (start == (TADDR)0)
-        return STUB_CODE_BLOCK_NOCODE;
+        return STUB_CODE_BLOCK_UNKNOWN;
     CodeHeader * pCHdr = PTR_CodeHeader(start - sizeof(CodeHeader));
-    return pCHdr->IsStubCodeBlock() ? pCHdr->GetStubCodeBlockKind() : STUB_CODE_BLOCK_MANAGED;
+    return pCHdr->IsStubCodeBlock() ? pCHdr->GetStubCodeBlockKind() : STUB_CODE_BLOCK_UNKNOWN;
 }
 
 
@@ -4744,7 +4744,7 @@ TADDR EECodeGenManager::FindMethodCode(PCODE currentPC)
 
     RangeSection * pRS = ExecutionManager::FindCodeRange(currentPC, ExecutionManager::GetScanFlags());
     if (pRS == NULL || (pRS->_flags & RangeSection::RANGE_SECTION_CODEHEAP) == 0)
-        return STUB_CODE_BLOCK_NOCODE;
+        return STUB_CODE_BLOCK_UNKNOWN;
     return dac_cast<PTR_EECodeGenManager>(pRS->_pjit)->FindMethodCode(pRS, currentPC);
 }