private static void ComputeLayout(StructDef structDef)
{
int alignOf = 1;
int runningOffset = 0;
foreach (FieldDef fieldDef in structDef.Fields)
{
var fieldType = fieldDef.Type;
int fieldAlignment = fieldType.AlignmentBytes;
fieldDef.OffsetBytes = Align(runningOffset, fieldAlignment);
alignOf = Math.Max(fieldAlignment, alignOf);
runningOffset = fieldDef.OffsetBytes + fieldType.SizeBytes;
}
structDef.SizeBytes = Align(runningOffset, alignOf);
structDef.AlignmentBytes = alignOf;
}
internal override void Resolve(Dictionary <string, StructDef> allStructs)
{
if (IsResolved)
{
return;
}
StructDef def;
if (!allStructs.TryGetValue(Name, out def))
{
throw new TypeException(this, $"struct {Name} unknown");
}
else
{
Definition = def;
}
foreach (FieldDef fieldDef in def.Fields)
{
fieldDef.Type.Resolve(allStructs);
}
}
private void EmitFieldStaticChecks(StructDef structDef, FieldDef fieldDef, TextWriter writer)
{
writer.WriteLine("_Static_assert(__builtin_offsetof({0}, {1}) == {2}, \"offset of field {0}::{1} does not match assembly output\");",
structDef.Name, fieldDef.Name, fieldDef.OffsetBytes);
}
private void EmitStructStaticChecks(StructDef structDef, TextWriter writer)
{
writer.WriteLine("_Static_assert(sizeof({0}) == {1}, \"size of struct {0} does not match assembly output\");",
structDef.Name, structDef.SizeBytes);
}
public StructType(Location loc, string name)
{
Location = loc;
Name = name;
Definition = null;
}