// If compInitMem is set, we may need to zero-initialize some locals. Normally it's done in the prolog
// but this loop can't include the prolog. Since we don't have liveness information, we insert zero-initialization
- // for all non-parameter non-temp locals as well as temp structs with GC fields.
+ // for all non-parameter IL locals as well as temp structs with GC fields.
// Liveness phase will remove unnecessary initializations.
if (info.compInitMem)
{
LclVarDsc* varDsc;
for (varNum = 0, varDsc = lvaTable; varNum < lvaCount; varNum++, varDsc++)
{
- var_types lclType = varDsc->TypeGet();
if (!varDsc->lvIsParam)
{
- if (!varDsc->lvIsTemp || ((lclType == TYP_STRUCT) && (varDsc->lvStructGcCount > 0)))
+ var_types lclType = varDsc->TypeGet();
+ bool isUserLocal = (varNum < info.compLocalsCount);
+ bool structWithGCFields = ((lclType == TYP_STRUCT) && (varDsc->lvStructGcCount > 0));
+ if (isUserLocal || structWithGCFields)
{
- var_types lclType = varDsc->TypeGet();
- GenTreePtr lcl = gtNewLclvNode(varNum, lclType);
- GenTreePtr init = nullptr;
+ GenTreePtr lcl = gtNewLclvNode(varNum, lclType);
+ GenTreePtr init = nullptr;
if (lclType == TYP_STRUCT)
{
const bool isVolatile = false;
--- /dev/null
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// It is a non-stress repro for the issue #14455.
+// growTree is optimized as fast tail call and converted to a loop.
+// `starg.s 0` forces the jit to create a temp for the modifiable this.
+// Before the fix the jit zero-initialized all long-live locals in the end of the loop,
+// on the last iteration it set `this` to `null` and the return block was trying to use
+// `null` to write `m_rightChild` in, that caused a runtime exception.
+
+
+.assembly extern System.Runtime {auto}
+.assembly GitHub_14455 {}
+
+.class public auto ansi beforefieldinit Rotate.Node
+ extends [System.Runtime]System.Object
+{
+ .field public class Rotate.Node m_leftChild
+ .field public class Rotate.Node m_rightChild
+ .method public hidebysig specialname rtspecialname
+ instance void .ctor() cil managed
+ {
+ // Code size 7 (0x7)
+ .maxstack 8
+ IL_0000: ldarg.0
+ IL_0001: call instance void [System.Runtime]System.Object::.ctor()
+ IL_0006: ret
+ } // end of method Node::.ctor
+
+ .method family hidebysig virtual instance void
+ Finalize() cil managed
+ {
+ .override [System.Runtime]System.Object::Finalize
+ // Code size 10 (0xa)
+ .maxstack 1
+ .try
+ {
+ IL_0000: leave.s IL_0009
+
+ } // end .try
+ finally
+ {
+ IL_0002: ldarg.0
+ IL_0003: call instance void [System.Runtime]System.Object::Finalize()
+ IL_0008: endfinally
+ } // end handler
+ IL_0009: ret
+ } // end of method Node::Finalize
+
+ .method public hidebysig instance void
+ growTree(int32 maxHeight) cil managed
+ {
+ // Code size 72 (0x48)
+ .maxstack 4
+ .locals init (class Rotate.Node V_0)
+ IL_0000: ldarg.1
+ IL_0001: ldc.i4.0
+ IL_0002: ble.s IL_0037
+
+ IL_0004: ldarg.0
+ IL_0005: newobj instance void Rotate.Node::.ctor()
+ IL_000a: stfld class Rotate.Node Rotate.Node::m_leftChild
+ IL_000f: ldarg.0
+ IL_0010: ldfld class Rotate.Node Rotate.Node::m_leftChild
+ IL_0015: ldarg.1
+ IL_0016: ldc.i4.1
+ IL_0017: sub
+ IL_0018: callvirt instance void Rotate.Node::growTree(int32)
+ IL_001d: ldarg.0
+ IL_001e: newobj instance void Rotate.Node::.ctor()
+ IL_0023: stfld class Rotate.Node Rotate.Node::m_rightChild
+ IL_0028: ldarg.0
+ IL_0029: ldfld class Rotate.Node Rotate.Node::m_rightChild
+ IL_002e: ldarg.1
+ IL_002f: ldc.i4.1
+ IL_0030: sub
+ IL_0031: callvirt instance void Rotate.Node::growTree(int32)
+ IL_0036: ret
+ ldarg.0
+ starg.s 0 // Force to create a temp for the modifiable this.
+ IL_0037: ldarg.0
+ IL_0038: ldarg.0
+ IL_0039: ldnull
+ IL_003a: dup
+ IL_003b: stloc.0
+ IL_003c: stfld class Rotate.Node Rotate.Node::m_rightChild
+ IL_0041: ldloc.0
+ IL_0042: stfld class Rotate.Node Rotate.Node::m_leftChild
+ IL_0047: ret
+ } // end of method Node::growTree
+
+ .method public hidebysig static int32 Main() cil managed
+ {
+ .entrypoint
+ // Code size 14 (0xe)
+ .maxstack 8
+ IL_0000: newobj instance void Rotate.Node::.ctor()
+ IL_0005: ldc.i4.4
+ IL_0006: callvirt instance void Rotate.Node::growTree(int32)
+ IL_000b: ldc.i4.s 100
+ IL_000d: ret
+ } // end of method Node::Main
+
+} // end of class Rotate.Node
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+ <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+ <PropertyGroup>
+ <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+ <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+ <AssemblyName>$(MSBuildProjectName)</AssemblyName>
+ <SchemaVersion>2.0</SchemaVersion>
+ <ProjectGuid>{95DFC527-4DC1-495E-97D7-E94EE1F7140D}</ProjectGuid>
+ <OutputType>Exe</OutputType>
+ <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+ <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+ </PropertyGroup>
+ <!-- Default configurations to help VS understand the configurations -->
+ <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "></PropertyGroup>
+ <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "></PropertyGroup>
+ <ItemGroup>
+ <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+ <Visible>False</Visible>
+ </CodeAnalysisDependentAssemblyPaths>
+ </ItemGroup>
+ <PropertyGroup>
+ <DebugType>None</DebugType>
+ <Optimize>True</Optimize>
+ </PropertyGroup>
+ <ItemGroup>
+ <Compile Include="GitHub_14455.il" />
+ </ItemGroup>
+ <ItemGroup>
+ <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+ </ItemGroup>
+ <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+ <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' "></PropertyGroup>
+</Project>