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using Mono.Cecil.Cil;
using Mono.Cecil.Rocks;
using System;
namespace Xamarin.Forms.Build.Tasks
{
static class MethodBodyExtensions
{
public static void Optimize(this MethodBody self)
{
if (self == null)
throw new ArgumentNullException(nameof(self));
self.OptimizeLongs();
self.OptimizeStLdLoc();
self.OptimizeMacros();
}
static void ExpandMacro(Instruction instruction, OpCode opcode, object operand)
{
instruction.OpCode = opcode;
instruction.Operand = operand;
}
//this can be removed if/when https://github.com/jbevain/cecil/pull/307 is released in a nuget we consume
static void OptimizeLongs(this MethodBody self)
{
var method = self.Method;
for (var i = 0; i < self.Instructions.Count; i++) {
var instruction = self.Instructions[i];
if (instruction.OpCode.Code != Code.Ldc_I8)
continue;
var l = (long)instruction.Operand;
if (l < int.MinValue || l > int.MaxValue)
continue;
ExpandMacro(instruction, OpCodes.Ldc_I4, unchecked((int)l));
self.Instructions.Insert(++i, Instruction.Create(OpCodes.Conv_I8));
}
}
static void OptimizeStLdLoc(this MethodBody self)
{
var method = self.Method;
for (var i = 0; i < self.Instructions.Count; i++) {
var instruction = self.Instructions[i];
if (instruction.OpCode.Code != Code.Stloc)
continue;
if (i + 1 >= self.Instructions.Count)
continue;
var next = self.Instructions[i + 1];
int num = ((VariableDefinition)instruction.Operand).Index;
var vardef = instruction.Operand;
if (next.OpCode.Code != Code.Ldloc || num != ((VariableDefinition)next.Operand).Index)
continue;
ExpandMacro(instruction, OpCodes.Dup, null);
ExpandMacro(next, OpCodes.Stloc, vardef);
}
}
}
}
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