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compiler: fix nil constant interface

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A nil interface has no dynamic type (or: nil dynamic type). Don't try to
use the static type as the dynamic type, because these are different.
This commit is contained in:
Ayke van Laethem
2018-09-03 01:01:24 +02:00
parent 4ed04309a3
commit c100e4d67f
2 changed files with 4 additions and 10 deletions
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compiler.go
+3 -9
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@@ -2279,16 +2279,10 @@ func (c *Compiler) parseConst(expr *ssa.Const) (llvm.Value, error) {
if expr.Value != nil {
return llvm.Value{}, errors.New("non-nil interface constant")
}
itfTypeNum, ok := c.ir.TypeNum(expr.Type())
if itfTypeNum >= 1<<16 {
return llvm.Value{}, errors.New("interface typecodes do not fit in a 16-bit integer")
}
if !ok {
panic("interface number is unknown")
}
// Create a generic nil interface with no dynamic type (typecode=0).
fields := []llvm.Value{
llvm.ConstInt(llvm.Int16Type(), uint64(itfTypeNum), false),
llvm.Undef(c.i8ptrType),
llvm.ConstInt(llvm.Int16Type(), 0, false),
llvm.ConstPointerNull(c.i8ptrType),
}
itf := llvm.ConstNamedStruct(c.mod.GetTypeByName("runtime._interface"), fields)
return itf, nil