public virtual void Emit(OpCode opcode, Label label)
{
int tlen = target_len(opcode);
make_room(6);
ll_emit(opcode);
if (cur_stack > labels [label.label].maxStack)
{
labels [label.label].maxStack = cur_stack;
}
if (fixups == null)
{
fixups = new LabelFixup [defaultFixupSize];
}
else if (num_fixups >= fixups.Length)
{
LabelFixup[] newf = new LabelFixup [fixups.Length * 2];
System.Array.Copy(fixups, newf, fixups.Length);
fixups = newf;
}
fixups [num_fixups].offset = tlen;
fixups [num_fixups].pos = code_len;
fixups [num_fixups].label_idx = label.label;
num_fixups++;
code_len += tlen;
}
public void Emit(OpCode opc, Label[] labels)
{
Emit(opc);
LabelFixup fix = new LabelFixup();
fix.label = -1;
fix.offset = code.Position;
labelFixups.Add(fix);
code.Write(labels.Length);
foreach (Label label in labels)
{
code.Write(label.Index);
if (this.labels[label.Index] != -1)
{
if (labelStackHeight[label.Index] != stackHeight)
{
// the "backward branch constraint" prohibits this, so we don't need to support it
throw new NotSupportedException();
}
}
else
{
Debug.Assert(labelStackHeight[label.Index] == -1 || labelStackHeight[label.Index] == stackHeight);
labelStackHeight[label.Index] = stackHeight;
}
}
}
public virtual void Emit(OpCode opcode, Label[] labels)
{
if (labels == null)
{
throw new ArgumentNullException("labels");
}
/* opcode needs to be switch. */
int count = labels.Length;
make_room(6 + count * 4);
ll_emit(opcode);
for (int i = 0; i < count; ++i)
{
if (cur_stack > this.labels [labels [i].label].maxStack)
{
this.labels [labels [i].label].maxStack = cur_stack;
}
}
emit_int(count);
if (fixups == null)
{
fixups = new LabelFixup [defaultFixupSize + count];
}
else if (num_fixups + count >= fixups.Length)
{
LabelFixup[] newf = new LabelFixup [count + fixups.Length * 2];
System.Array.Copy(fixups, newf, fixups.Length);
fixups = newf;
}
// ECMA 335, Partition III, p94 (7-10)
//
// The switch instruction implements a jump table. The format of
// the instruction is an unsigned int32 representing the number of targets N,
// followed by N int32 values specifying jump targets: these targets are
// represented as offsets (positive or negative) from the beginning of the
// instruction following this switch instruction.
//
// We must make sure it gets an offset from the *end* of the last label
// (eg, the beginning of the instruction following this).
//
// remaining is the number of bytes from the current instruction to the
// instruction that will be emitted.
for (int i = 0, remaining = count * 4; i < count; ++i, remaining -= 4)
{
fixups [num_fixups].offset = remaining;
fixups [num_fixups].pos = code_len;
fixups [num_fixups].label_idx = labels [i].label;
num_fixups++;
code_len += 4;
}
}
public void Emit(OpCode opc, Label label)
{
// We need special stackHeight handling for unconditional branches,
// because the branch and next flows have differing stack heights.
// Note that this assumes that unconditional branches do not push/pop.
int flowStackHeight = this.stackHeight;
Emit(opc);
if (opc == OpCodes.Leave || opc == OpCodes.Leave_S)
{
flowStackHeight = 0;
}
else if (opc.FlowControl != FlowControl.Branch)
{
flowStackHeight = this.stackHeight;
}
// if the label has already been marked, we can emit the branch offset directly
if (labels[label.Index] != -1)
{
if (labelStackHeight[label.Index] != flowStackHeight && (labelStackHeight[label.Index] != 0 || flowStackHeight != -1))
{
// the "backward branch constraint" prohibits this, so we don't need to support it
throw new NotSupportedException("'Backward branch constraints' violated");
}
if (opc.OperandType == OperandType.ShortInlineBrTarget)
{
WriteByteBranchOffset(labels[label.Index] - (code.Position + 1));
}
else
{
code.Write(labels[label.Index] - (code.Position + 4));
}
}
else
{
Debug.Assert(labelStackHeight[label.Index] == -1 || labelStackHeight[label.Index] == flowStackHeight || (flowStackHeight == -1 && labelStackHeight[label.Index] == 0));
labelStackHeight[label.Index] = flowStackHeight;
LabelFixup fix = new LabelFixup();
fix.label = label.Index;
fix.offset = code.Position;
labelFixups.Add(fix);
if (opc.OperandType == OperandType.ShortInlineBrTarget)
{
code.Write((byte)1);
}
else
{
code.Write(4);
}
}
}
public virtual void Emit (OpCode opcode, Label[] labels)
{
if (labels == null)
throw new ArgumentNullException ("labels");
/* opcode needs to be switch. */
int count = labels.Length;
make_room (6 + count * 4);
ll_emit (opcode);
for (int i = 0; i < count; ++i)
if (cur_stack > this.labels [labels [i].label].maxStack)
this.labels [labels [i].label].maxStack = cur_stack;
emit_int (count);
if (fixups == null)
fixups = new LabelFixup [defaultFixupSize + count];
else if (num_fixups + count >= fixups.Length) {
LabelFixup[] newf = new LabelFixup [count + fixups.Length * 2];
System.Array.Copy (fixups, newf, fixups.Length);
fixups = newf;
}
// ECMA 335, Partition III, p94 (7-10)
//
// The switch instruction implements a jump table. The format of
// the instruction is an unsigned int32 representing the number of targets N,
// followed by N int32 values specifying jump targets: these targets are
// represented as offsets (positive or negative) from the beginning of the
// instruction following this switch instruction.
//
// We must make sure it gets an offset from the *end* of the last label
// (eg, the beginning of the instruction following this).
//
// remaining is the number of bytes from the current instruction to the
// instruction that will be emitted.
for (int i = 0, remaining = count * 4; i < count; ++i, remaining -= 4) {
fixups [num_fixups].offset = remaining;
fixups [num_fixups].pos = code_len;
fixups [num_fixups].label_idx = labels [i].label;
num_fixups++;
code_len += 4;
}
}
public virtual void Emit (OpCode opcode, Label label)
{
int tlen = target_len (opcode);
make_room (6);
ll_emit (opcode);
if (cur_stack > labels [label.label].maxStack)
labels [label.label].maxStack = cur_stack;
if (fixups == null)
fixups = new LabelFixup [defaultFixupSize];
else if (num_fixups >= fixups.Length) {
LabelFixup[] newf = new LabelFixup [fixups.Length * 2];
System.Array.Copy (fixups, newf, fixups.Length);
fixups = newf;
}
fixups [num_fixups].offset = tlen;
fixups [num_fixups].pos = code_len;
fixups [num_fixups].label_idx = label.label;
num_fixups++;
code_len += tlen;
}
