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Removed uses of out variables and introduced a generated variable identifier class.

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This commit is contained in:
Jarl Gullberg 2017-05-29 18:57:13 +02:00
parent 092ffb480c
commit 760e68ed4e
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GPG key ID: 750FF6F6BDA72D23
3 changed files with 106 additions and 56 deletions
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36
src/Generator.Rewrite/GeneratedVariableIdentifier.cs
View file

@ -1,7 +1,43 @@
using System;
namespace OpenTK.Rewrite
{
/// <summary>
/// Acts as a unique identifier for a generated named variable that can be passed between methods. Replaces uses of
/// variable names from Mono.Cecil.
/// </summary>
public class GeneratedVariableIdentifier
{
/// <summary>
/// The name of the generated variable.
/// </summary>
public string Name { get; }
/// <summary>
/// The index of the generated variable in its method.
/// </summary>
public int Index { get; }
/// <summary>
/// Initializes a new instance of the <see cref="GeneratedVariableIdentifier"/> class.
/// </summary>
/// <param name="name">The name of the generated variable.</param>
/// <param name="index">The index of the generated variable in its method.</param>
/// <exception cref="ArgumentException"></exception>
public GeneratedVariableIdentifier(string name, int index)
{
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException("The name argument cannot be null or empty", nameof(name));
}
if (index < 0)
{
throw new ArgumentException("The index must be greater than zero.", nameof(index));
}
this.Name = name;
this.Index = index;
}
}
}

1
src/Generator.Rewrite/Generator.Rewrite.csproj
View file

@ -52,6 +52,7 @@
<Reference Include="System.Core" />
</ItemGroup>
<ItemGroup>
<Compile Include="GeneratedVariableIdentifier.cs" />
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>

125
src/Generator.Rewrite/Program.cs
View file

@ -266,17 +266,15 @@ namespace OpenTK.Rewrite
}
// Patch convenience wrappers
int stringBuilderPointerVarIndex = -1;
int stringPointerVarIndex = -1;
int stringArrayPointerVarIndex = -1;
if (wrapper.Parameters.Count == native.Parameters.Count)
List<GeneratedVariableIdentifier> generatedVariables = new List<GeneratedVariableIdentifier>();
if (wrapper.Parameters.Count == native.Parameters.Count)
{
EmitParameters(wrapper, native, body, il, out stringBuilderPointerVarIndex, out stringPointerVarIndex, out stringArrayPointerVarIndex);
generatedVariables = EmitParameters(wrapper, native, body, il);
}
else
{
int difference = native.Parameters.Count - wrapper.Parameters.Count;
EmitConvenienceWrapper(wrapper, native, difference, body, il);
generatedVariables = EmitConvenienceWrapper(wrapper, native, difference, body, il);
}
if (slot != -1)
@ -298,7 +296,7 @@ namespace OpenTK.Rewrite
EmitReturnTypeWrapper(wrapper, native, body, il);
}
EmitParameterEpilogues(wrapper, native, body, il, stringBuilderPointerVarIndex, stringPointerVarIndex, stringArrayPointerVarIndex);
EmitParameterEpilogues(wrapper, native, body, il, generatedVariables);
if (options.Contains("-debug"))
{
@ -519,29 +517,28 @@ namespace OpenTK.Rewrite
}
static void EmitParameterEpilogues(MethodDefinition wrapper, MethodDefinition native, MethodBody body, ILProcessor il,
int stringBuilderPointerVarIndex, int stringPointerVarIndex, int stringArrayPointerVarIndex)
List<GeneratedVariableIdentifier> generatedVariables)
{
foreach (var p in wrapper.Parameters) // TODO: Should not need to check for >= 0 here, but StringBuilder
// TODO: requires it for some reason. Find out why
foreach (var p in wrapper.Parameters)
{
if (p.ParameterType.Name == "StringBuilder" && stringBuilderPointerVarIndex >= 0)
if (p.ParameterType.Name == "StringBuilder")
{
EmitStringBuilderEpilogue(wrapper, native, p, body, il, stringBuilderPointerVarIndex);
EmitStringBuilderEpilogue(wrapper, native, p, body, il, generatedVariables.FirstOrDefault(g => g.Name == p.Name + "_sb_ptr"));
}
if (!p.ParameterType.IsArray && p.ParameterType.Name == "String" && stringPointerVarIndex >= 0)
if (!p.ParameterType.IsArray && p.ParameterType.Name == "String")
{
EmitStringEpilogue(wrapper, p, body, il, stringPointerVarIndex);
EmitStringEpilogue(wrapper, p, body, il, generatedVariables.FirstOrDefault(g => g.Name == p.Name + "_string_ptr"));
}
if (p.ParameterType.IsArray && p.ParameterType.GetElementType().Name == "String" && stringArrayPointerVarIndex >= 0)
if (p.ParameterType.IsArray && p.ParameterType.GetElementType().Name == "String")
{
EmitStringArrayEpilogue(wrapper, p, body, il, stringArrayPointerVarIndex);
EmitStringArrayEpilogue(wrapper, p, body, il, generatedVariables.FirstOrDefault(g => g.Name == p.Name + "_string_array_ptr"));
}
}
}
static void EmitStringBuilderParameter(MethodDefinition method, ParameterDefinition parameter, MethodBody body, ILProcessor il, out int stringBuilderPointerIndex)
static GeneratedVariableIdentifier EmitStringBuilderParameter(MethodDefinition method, ParameterDefinition parameter, MethodBody body, ILProcessor il)
{
var p = parameter.ParameterType;
@ -561,21 +558,30 @@ namespace OpenTK.Rewrite
// IntPtr ptr;
body.Variables.Add(new VariableDefinition(TypeIntPtr));
stringBuilderPointerIndex = body.Variables.Count - 1;
int stringBuilderPtrIndex = body.Variables.Count - 1;
GeneratedVariableIdentifier stringBuilderPtrVar = new GeneratedVariableIdentifier(parameter.Name + "_sb_ptr", stringBuilderPtrIndex);
// ptr = Marshal.AllocHGlobal(sb.Capacity + 1);
il.Emit(OpCodes.Callvirt, sb_get_capacity);
il.Emit(OpCodes.Call, alloc_hglobal);
il.Emit(OpCodes.Stloc, stringBuilderPointerIndex);
il.Emit(OpCodes.Ldloc, stringBuilderPointerIndex);
il.Emit(OpCodes.Stloc, stringBuilderPtrVar.Index);
il.Emit(OpCodes.Ldloc, stringBuilderPtrVar.Index);
// We'll emit the try-finally block in the epilogue implementation,
// because we haven't yet emitted all necessary instructions here.
return stringBuilderPtrVar;
}
static void EmitStringBuilderEpilogue(MethodDefinition wrapper, MethodDefinition native,
ParameterDefinition parameter, MethodBody body, ILProcessor il, int generatedPointerVarIndex)
ParameterDefinition parameter, MethodBody body, ILProcessor il, GeneratedVariableIdentifier generatedPtrVar)
{
if (generatedPtrVar == null)
{
throw new ArgumentNullException(nameof(generatedPtrVar));
}
var p = parameter.ParameterType;
if (p.Name == "StringBuilder")
{
@ -596,22 +602,22 @@ namespace OpenTK.Rewrite
var block = new ExceptionHandler(ExceptionHandlerType.Finally);
block.TryStart = body.Instructions[0];
il.Emit(OpCodes.Ldloc, generatedPointerVarIndex);
il.Emit(OpCodes.Ldloc, generatedPtrVar.Index);
il.Emit(OpCodes.Ldarg, parameter.Index);
il.Emit(OpCodes.Call, ptr_to_sb);
block.TryEnd = body.Instructions.Last();
block.HandlerStart = body.Instructions.Last();
il.Emit(OpCodes.Ldloc, generatedPointerVarIndex);
il.Emit(OpCodes.Ldloc, generatedPtrVar.Index);
il.Emit(OpCodes.Call, free_hglobal);
block.HandlerEnd = body.Instructions.Last();
}
}
static void EmitStringParameter(MethodDefinition wrapper, ParameterDefinition parameter, MethodBody body,
ILProcessor il, out int generatedPointerVarIndex)
static GeneratedVariableIdentifier EmitStringParameter(MethodDefinition wrapper, ParameterDefinition parameter, MethodBody body,
ILProcessor il)
{
var p = parameter.ParameterType;
@ -623,29 +629,32 @@ namespace OpenTK.Rewrite
// IntPtr ptr;
body.Variables.Add(new VariableDefinition(TypeIntPtr));
generatedPointerVarIndex = body.Variables.Count - 1;
int generatedPointerVarIndex = body.Variables.Count - 1;
GeneratedVariableIdentifier stringPtrVar = new GeneratedVariableIdentifier(parameter.Name + "_string_ptr", generatedPointerVarIndex);
// ptr = Marshal.StringToHGlobalAnsi(str);
il.Emit(OpCodes.Call, marshal_str_to_ptr);
il.Emit(OpCodes.Stloc, generatedPointerVarIndex);
il.Emit(OpCodes.Ldloc, generatedPointerVarIndex);
il.Emit(OpCodes.Stloc, stringPtrVar.Index);
il.Emit(OpCodes.Ldloc, stringPtrVar.Index);
// The finally block will be emitted in the function epilogue
return stringPtrVar;
}
static void EmitStringEpilogue(MethodDefinition wrapper, ParameterDefinition parameter, MethodBody body,
ILProcessor il, int generatedPointerVarIndex)
ILProcessor il, GeneratedVariableIdentifier generatedPtrVar)
{
var p = parameter.ParameterType;
var free = wrapper.Module.ImportReference(TypeBindingsBase.Methods.First(m => m.Name == "FreeStringPtr"));
// FreeStringPtr(ptr)
il.Emit(OpCodes.Ldloc, generatedPointerVarIndex);
il.Emit(OpCodes.Ldloc, generatedPtrVar.Index);
il.Emit(OpCodes.Call, free);
}
static void EmitStringArrayParameter(MethodDefinition wrapper, ParameterDefinition parameter, MethodBody body,
ILProcessor il, out int generatedPointerVarIndex)
static GeneratedVariableIdentifier EmitStringArrayParameter(MethodDefinition wrapper, ParameterDefinition parameter, MethodBody body,
ILProcessor il)
{
var p = parameter.ParameterType;
@ -657,19 +666,28 @@ namespace OpenTK.Rewrite
// IntPtr ptr;
body.Variables.Add(new VariableDefinition(TypeIntPtr));
generatedPointerVarIndex = body.Variables.Count - 1;
int generatedPointerVarIndex = body.Variables.Count - 1;
GeneratedVariableIdentifier stringArrayPtrVar = new GeneratedVariableIdentifier(parameter.Name + "_string_array_ptr", generatedPointerVarIndex);
// ptr = MarshalStringArrayToPtr(strings);
il.Emit(OpCodes.Call, marshal_str_array_to_ptr);
il.Emit(OpCodes.Stloc, generatedPointerVarIndex);
il.Emit(OpCodes.Ldloc, generatedPointerVarIndex);
il.Emit(OpCodes.Stloc, stringArrayPtrVar.Index);
il.Emit(OpCodes.Ldloc, stringArrayPtrVar.Index);
// The finally block will be emitted in the function epilogue
return stringArrayPtrVar;
}
static void EmitStringArrayEpilogue(MethodDefinition wrapper, ParameterDefinition parameter, MethodBody body,
ILProcessor il, int generatedPointerVarIndex)
ILProcessor il, GeneratedVariableIdentifier generatedPtrVar)
{
if (generatedPtrVar == null)
{
throw new ArgumentNullException(nameof(generatedPtrVar));
}
// Note: only works for string vectors (1d arrays).
// We do not (and will probably never) support 2d or higher string arrays
var p = parameter.ParameterType;
@ -678,7 +696,7 @@ namespace OpenTK.Rewrite
// FreeStringArrayPtr(string_array_ptr, string_array.Length)
// load string_array_ptr
il.Emit(OpCodes.Ldloc, generatedPointerVarIndex);
il.Emit(OpCodes.Ldloc, generatedPtrVar.Index);
// load string_array.Length
il.Emit(OpCodes.Ldarg, parameter.Index);
@ -689,7 +707,7 @@ namespace OpenTK.Rewrite
il.Emit(OpCodes.Call, free);
}
static void EmitConvenienceWrapper(MethodDefinition wrapper,
static List<GeneratedVariableIdentifier> EmitConvenienceWrapper(MethodDefinition wrapper,
MethodDefinition native, int difference, MethodBody body, ILProcessor il)
{
if (wrapper.Parameters.Count > 2)
@ -698,6 +716,8 @@ namespace OpenTK.Rewrite
throw new NotImplementedException();
}
List<GeneratedVariableIdentifier> generatedVariables = new List<GeneratedVariableIdentifier>();
if (wrapper.ReturnType.Name != "Void")
{
if (difference == 2)
@ -725,11 +745,7 @@ namespace OpenTK.Rewrite
// }
body.Variables.Add(new VariableDefinition(wrapper.ReturnType));
int dummy1;
int dummy2;
int dummy3;
EmitParameters(wrapper, native, body, il, out dummy1, out dummy2, out dummy3);
generatedVariables = EmitParameters(wrapper, native, body, il);
il.Emit(OpCodes.Ldloca, body.Variables.Count - 1);
}
else
@ -755,18 +771,14 @@ namespace OpenTK.Rewrite
Console.Error.WriteLine("Unknown wrapper type for ({0})", native.Name);
}
}
return generatedVariables;
}
static int EmitParameters(MethodDefinition method, MethodDefinition native, MethodBody body, ILProcessor il,
out int stringBuilderPointerVarIndex, out int stringPointerVarIndex, out int stringArrayPointerVarIndex)
static List<GeneratedVariableIdentifier> EmitParameters(MethodDefinition method, MethodDefinition native, MethodBody body, ILProcessor il)
{
// Default outs
stringBuilderPointerVarIndex = -1;
stringPointerVarIndex = -1;
stringArrayPointerVarIndex = -1;
int i;
for (i = 0; i < method.Parameters.Count; i++)
List<GeneratedVariableIdentifier> generatedVariables = new List<GeneratedVariableIdentifier>();
for (int i = 0; i < method.Parameters.Count; i++)
{
var parameter = method.Parameters[i];
var p = method.Module.ImportReference(method.Parameters[i].ParameterType);
@ -780,11 +792,11 @@ namespace OpenTK.Rewrite
}
else if (p.Name == "StringBuilder")
{
EmitStringBuilderParameter(method, parameter, body, il, out stringBuilderPointerVarIndex);
generatedVariables.Add(EmitStringBuilderParameter(method, parameter, body, il));
}
else if (p.Name == "String" && !p.IsArray)
{
EmitStringParameter(method, parameter, body, il, out stringPointerVarIndex);
generatedVariables.Add(EmitStringParameter(method, parameter, body, il));
}
else if (p.IsByReference)
{
@ -886,11 +898,12 @@ namespace OpenTK.Rewrite
}
else
{
EmitStringArrayParameter(method, parameter, body, il, out stringArrayPointerVarIndex);
generatedVariables.Add(EmitStringArrayParameter(method, parameter, body, il));
}
}
}
return i;
return generatedVariables;
}
static void EmitEntryPoint(FieldDefinition entry_points, ILProcessor il, int slot)