/// <summary>
/// Inserts an unconditional jump to the location described by the jump token.
/// This may be a forward or backward jump, but should be local to the Assembler.
/// </summary>
public override void Jump(Compiler.JumpToken token)
{
JumpToken t = (JumpToken)token;
t.SetKind(JumpTokenKind.Relative);
region.WriteByte(0xe9); // relative offset next instruction
t.SetJumpSite(region.InsertIntToken());
}
/// <summary>
/// Assosiates a JumpToken with a location in the code stream.
/// </summary>
public override void SetDestination(Compiler.JumpToken token)
{
if (token == null)
{
throw new ArgumentNullException("token");
}
((JumpToken)token).SetDestination(region.CurrentLocation);
}
public override void JumpIfUnassigned(Compiler.JumpToken token)
{
JumpToken t = (JumpToken)token;
t.SetKind(JumpTokenKind.Relative);
region.Write(new byte[] {
0x21, 0xd2, // and edx, edx
0x0f, 0x84 // jz
});
t.SetJumpSite(region.InsertIntToken());
}
public override void JumpIfTrue(Compiler.JumpToken token)
{
JumpToken t = (JumpToken)token;
t.SetKind(JumpTokenKind.Relative);
region.Write(new byte[] {
0x21, 0xc0, // and eax, eax
0x0f, 0x85 // jnz
});
t.SetJumpSite(region.InsertIntToken());
}
public override void JumpIfNotMarked(Compiler.JumpToken token)
{
region.Write(new byte[] {
0x48, 0xF7, 0xC2, 0x01, 0x00, 0x00, 0x00 // test rdx, 1
});
JumpToken t = (JumpToken)token;
t.SetKind(JumpTokenKind.Relative);
region.Write(new byte[] {
0x0f, 0x84 // jz
});
t.SetJumpSite(region.InsertIntToken());
}
