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* PPTC & Pool Enhancements.
* Avoid buffer allocations in CodeGenContext.GetCode(). Avoid stream allocations in PTC.PtcInfo.
Refactoring/nits.
* Use XXHash128, for Ptc.Load & Ptc.Save, x10 faster than Md5.
* Why not a nice Span.
* Added a simple PtcFormatter library for deserialization/serialization, which does not require reflection, in use at PtcJumpTable and PtcProfiler; improves maintainability and simplicity/readability of affected code.
* Nits.
* Revert #1987.
* Revert "Revert #1987."
This reverts commit 998be765cf
.
125 lines
5.3 KiB
C#
125 lines
5.3 KiB
C#
using ARMeilleure.Instructions;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.State;
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using System;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using static ARMeilleure.IntermediateRepresentation.OperandHelper;
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namespace ARMeilleure.Translation
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{
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static class DirectCallStubs
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{
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private delegate long GuestFunction(IntPtr nativeContextPtr);
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private static IntPtr _directCallStubPtr;
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private static IntPtr _directTailCallStubPtr;
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private static IntPtr _indirectCallStubPtr;
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private static IntPtr _indirectTailCallStubPtr;
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private static readonly object _lock = new object();
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private static bool _initialized;
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public static void InitializeStubs()
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{
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if (_initialized) return;
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lock (_lock)
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{
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if (_initialized) return;
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Translator.PreparePool();
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_directCallStubPtr = Marshal.GetFunctionPointerForDelegate<GuestFunction>(GenerateDirectCallStub(false));
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_directTailCallStubPtr = Marshal.GetFunctionPointerForDelegate<GuestFunction>(GenerateDirectCallStub(true));
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_indirectCallStubPtr = Marshal.GetFunctionPointerForDelegate<GuestFunction>(GenerateIndirectCallStub(false));
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_indirectTailCallStubPtr = Marshal.GetFunctionPointerForDelegate<GuestFunction>(GenerateIndirectCallStub(true));
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Translator.ResetPool();
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Translator.DisposePools();
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_initialized = true;
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}
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}
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public static IntPtr DirectCallStub(bool tailCall)
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{
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Debug.Assert(_initialized);
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return tailCall ? _directTailCallStubPtr : _directCallStubPtr;
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}
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public static IntPtr IndirectCallStub(bool tailCall)
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{
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Debug.Assert(_initialized);
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return tailCall ? _indirectTailCallStubPtr : _indirectCallStubPtr;
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}
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private static void EmitCall(EmitterContext context, Operand address, bool tailCall)
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{
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if (tailCall)
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{
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context.Tailcall(address, context.LoadArgument(OperandType.I64, 0));
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}
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else
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{
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context.Return(context.Call(address, OperandType.I64, context.LoadArgument(OperandType.I64, 0)));
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}
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}
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/// <summary>
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/// Generates a stub that is used to find function addresses. Used for direct calls when their jump table does not have the host address yet.
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/// Takes a NativeContext like a translated guest function, and extracts the target address from the NativeContext.
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/// When the target function is compiled in highCq, all table entries are updated to point to that function instead of this stub by the translator.
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/// </summary>
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private static GuestFunction GenerateDirectCallStub(bool tailCall)
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{
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EmitterContext context = new EmitterContext();
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Operand nativeContextPtr = context.LoadArgument(OperandType.I64, 0);
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Operand address = context.Load(OperandType.I64, context.Add(nativeContextPtr, Const((long)NativeContext.GetCallAddressOffset())));
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Operand functionAddr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFunctionAddress)), address);
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EmitCall(context, functionAddr, tailCall);
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ControlFlowGraph cfg = context.GetControlFlowGraph();
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OperandType[] argTypes = new OperandType[] { OperandType.I64 };
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return Compiler.Compile<GuestFunction>(cfg, argTypes, OperandType.I64, CompilerOptions.HighCq);
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}
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/// <summary>
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/// Generates a stub that is used to find function addresses and add them to an indirect table.
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/// Used for indirect calls entries (already claimed) when their jump table does not have the host address yet.
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/// Takes a NativeContext like a translated guest function, and extracts the target indirect table entry from the NativeContext.
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/// If the function we find is highCq, the entry in the table is updated to point to that function rather than this stub.
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/// </summary>
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private static GuestFunction GenerateIndirectCallStub(bool tailCall)
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{
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EmitterContext context = new EmitterContext();
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Operand nativeContextPtr = context.LoadArgument(OperandType.I64, 0);
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Operand entryAddress = context.Load(OperandType.I64, context.Add(nativeContextPtr, Const((long)NativeContext.GetCallAddressOffset())));
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Operand address = context.Load(OperandType.I64, entryAddress);
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// We need to find the missing function. If the function is HighCq, then it replaces this stub in the indirect table.
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// Either way, we call it afterwards.
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Operand functionAddr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetIndirectFunctionAddress)), address, entryAddress);
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// Call and save the function.
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EmitCall(context, functionAddr, tailCall);
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ControlFlowGraph cfg = context.GetControlFlowGraph();
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OperandType[] argTypes = new OperandType[] { OperandType.I64 };
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return Compiler.Compile<GuestFunction>(cfg, argTypes, OperandType.I64, CompilerOptions.HighCq);
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}
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}
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}
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