private static void MethodResolver(MethodContext context)
{
if (context.Method.Name == "SimpleSum")
{
Assembler assembler = new Assembler(64);
//Replace with fatorial number:
//int sum = num1+num2;
//int fatorial = 1;
//for(int i = 2; i <= sum; i++){
// fatorial *= i;
//}
//return fatorial;
assembler.add(edx, ecx);
assembler.mov(eax, 1);
assembler.mov(ecx, 2);
assembler.cmp(edx, 0x02);
assembler.jl(assembler.@F);
assembler.AnonymousLabel();
assembler.imul(eax, ecx);
assembler.inc(ecx);
assembler.cmp(ecx, edx);
assembler.jle(assembler.@B);
assembler.AnonymousLabel();
assembler.ret();
using MemoryStream ms = new MemoryStream();
assembler.Assemble(new StreamCodeWriter(ms), 0);
byte[] asm = ms.ToArray();
context.ResolveNative(asm);
}
}
void At_most_one_anon_label_per_instruction()
{
var c = new Assembler(64);
c.nop();
c.AnonymousLabel();
Assert.Throws <InvalidOperationException>(() => c.AnonymousLabel());
}
void Anonymous_labels()
{
var c = new Assembler(64);
var lbl1 = c.CreateLabel();
var lbl2 = c.CreateLabel();
var lbl3 = c.CreateLabel();
var lbl4 = c.CreateLabel();
c.Label(ref lbl1);
c.inc(eax);
c.nop();
c.AnonymousLabel();
c.je(c.@B);
c.nop();
c.Label(ref lbl2);
c.je(c.@B);
c.nop();
c.jmp(lbl1);
c.nop();
c.jmp(lbl2);
c.nop();
c.jmp(lbl3);
c.nop();
c.jmp(lbl4);
c.nop();
c.jne(c.@F);
c.nop();
c.Label(ref lbl3);
c.jne(c.@F);
c.nop();
c.AnonymousLabel();
c.inc(eax);
c.nop();
c.Label(ref lbl4);
c.nop();
c.nop();
var expectedData = new byte[] {
0xFF, 0xC0, 0x90, 0x74, 0xFE, 0x90, 0x74, 0xFB, 0x90, 0xEB, 0xF5, 0x90, 0xEB, 0xF8, 0x90, 0xEB,
0x07, 0x90, 0xEB, 0x0A, 0x90, 0x75, 0x04, 0x90, 0x75, 0x01, 0x90, 0xFF, 0xC0, 0x90, 0x90, 0x90,
};
var writer = new CodeWriterImpl();
c.Assemble(writer, 0);
Assert.Equal(expectedData, writer.ToArray());
}
void Unused_anonymous_label_throws()
{
var c = new Assembler(64);
c.nop();
c.AnonymousLabel();
Assert.Throws <InvalidOperationException>(() => c.Assemble(new CodeWriterImpl(), 0));
}
void Anonymous_label_and_named_label_cant_use_same_instruction()
{
{
var c = new Assembler(64);
var lbl = c.CreateLabel();
c.nop();
c.Label(ref lbl);
c.AnonymousLabel();
Assert.Throws <InvalidOperationException>(() => c.nop());
}
{
var c = new Assembler(64);
var lbl = c.CreateLabel();
c.nop();
c.AnonymousLabel();
c.Label(ref lbl);
Assert.Throws <InvalidOperationException>(() => c.nop());
}
}