/// <summary>
/// Compiles this tree into a NativeSDF instance that can be used to efficiently sample the distance
/// field represented by this hierarchy. A compiled NativeSDF instance will not reflect any changes
/// made to the hierarchy after the compile step.
///
/// The resulting NativeSDF instance can also be used inside of the Unity Job system, and is compatible
/// with the Unity Burst compiler.
/// </summary>
public NativeSDF Compile(Allocator allocator = Allocator.Persistent)
{
var countVisitor = new InstructionCountVisitor();
VisitInstructions(ref countVisitor);
var sizeVisitor = new BufferSizeVisitor();
VisitInstructions(ref sizeVisitor);
var stackVisitor = new StackSizeVisitor();
VisitInstructions(ref stackVisitor);
IntPtr instructions;
unsafe {
instructions = (IntPtr)UnsafeUtility.Malloc(sizeVisitor.BufferSize,
sizeof(float),
allocator);
}
var bufferWriter = new InstructionWriteVisitor();
bufferWriter.ptr = instructions;
bufferWriter.byteOffset = 0;
VisitInstructions(ref bufferWriter);
return(new NativeSDF(instructions, countVisitor.InstructionCount, stackVisitor.MaxStack, allocator));
}
public Stmt Create()
{
var mDef = this.ctx.MRef.Resolve();
if (!mDef.HasBody)
{
throw new ArgumentException("Method has no body, cannot create AST");
}
var body = mDef.Body;
// Pre-calculate all method block starts
this.methodBlockStarts = body.Instructions
.SelectMany(x => {
switch (x.OpCode.FlowControl)
{
case FlowControl.Cond_Branch:
case FlowControl.Branch:
if (x.OpCode.Code == Code.Switch)
{
return(((Instruction[])x.Operand).Concat(x.Next));
}
else
{
return(new[] { (Instruction)x.Operand, x.Next });
}
case FlowControl.Throw:
case FlowControl.Return:
return(new[] { x.Next });
default:
return(Enumerable.Empty <Instruction>());
}
})
.Concat(body.ExceptionHandlers.SelectMany(x => new[] {
x.TryStart, x.TryEnd, x.HandlerStart, x.HandlerEnd
}))
.Concat(body.Instructions.First())
.Where(x => x != null)
.Distinct()
.OrderBy(x => x.Offset)
.ToArray();
// Create all method blocks
this.CreatePart(body.Instructions, body.ExceptionHandlers);
// Map continuations and try statements
// Must continue to outermost Try statement, if one exists, rather than directly to the first CIL block
foreach (var mappable in this.mappable)
{
mappable.Map(this.blockMap);
}
var stmt0 = this.blockMap[body.Instructions.First()].First();
var vStackSize = new StackSizeVisitor();
vStackSize.Visit(stmt0);
// Create entry block, and return it
var entryBlock = new StmtCil(this.ctx, null, new StmtContinuation(this.ctx, stmt0, false), StmtCil.SpecialBlock.Start);
return(entryBlock);
}
public Stmt Create() {
var mDef = this.ctx.MRef.Resolve();
if (!mDef.HasBody) {
throw new ArgumentException("Method has no body, cannot create AST");
}
var body = mDef.Body;
// Pre-calculate all method block starts
this.methodBlockStarts = body.Instructions
.SelectMany(x => {
switch (x.OpCode.FlowControl) {
case FlowControl.Cond_Branch:
case FlowControl.Branch:
if (x.OpCode.Code == Code.Switch) {
return ((Instruction[])x.Operand).Concat(x.Next);
} else {
return new[] { (Instruction)x.Operand, x.Next };
}
case FlowControl.Throw:
case FlowControl.Return:
return new[] { x.Next };
default:
return Enumerable.Empty<Instruction>();
}
})
.Concat(body.ExceptionHandlers.SelectMany(x => new[] {
x.TryStart, x.TryEnd, x.HandlerStart, x.HandlerEnd
}))
.Concat(body.Instructions.First())
.Where(x => x != null)
.Distinct()
.OrderBy(x => x.Offset)
.ToArray();
// Create all method blocks
this.CreatePart(body.Instructions, body.ExceptionHandlers);
// Map continuations and try statements
// Must continue to outermost Try statement, if one exists, rather than directly to the first CIL block
foreach (var mappable in this.mappable) {
mappable.Map(this.blockMap);
}
var stmt0 = this.blockMap[body.Instructions.First()].First();
var vStackSize = new StackSizeVisitor();
vStackSize.Visit(stmt0);
// Create entry block, and return it
var entryBlock = new StmtCil(this.ctx, null, new StmtContinuation(this.ctx, stmt0, false), StmtCil.SpecialBlock.Start);
return entryBlock;
}
