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interp: support integer icmp of ptrtoint

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This kind of code might be generated by the switch implementation of
func values. The func value is represented as a ptrtoint, and before
calling it, it is compared against 0.
This commit is contained in:
Ayke van Laethem
2019-11-25 00:18:44 +01:00
committed by Ron Evans
parent 4f7a650614
commit 0db26b0662
4 changed files with 57 additions and 13 deletions
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interp/frame.go
+18 -10
View File
@@ -194,20 +194,28 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
lhs := fr.getLocal(inst.Operand(0)).(*LocalValue).Underlying
rhs := fr.getLocal(inst.Operand(1)).(*LocalValue).Underlying
predicate := inst.IntPredicate()
if predicate == llvm.IntEQ && lhs.Type().TypeKind() == llvm.PointerTypeKind {
// Unfortunately, the const propagation in the IR builder
// doesn't handle pointer compares of inttoptr values. So we
// implement it manually here.
lhsNil, ok1 := isPointerNil(lhs)
rhsNil, ok2 := isPointerNil(rhs)
if predicate == llvm.IntEQ {
var lhsZero, rhsZero bool
var ok1, ok2 bool
if lhs.Type().TypeKind() == llvm.PointerTypeKind {
// Unfortunately, the const propagation in the IR builder
// doesn't handle pointer compares of inttoptr values. So we
// implement it manually here.
lhsZero, ok1 = isPointerNil(lhs)
rhsZero, ok2 = isPointerNil(rhs)
}
if lhs.Type().TypeKind() == llvm.IntegerTypeKind {
lhsZero, ok1 = isZero(lhs)
rhsZero, ok2 = isZero(rhs)
}
if ok1 && ok2 {
if lhsNil && rhsNil {
// Both are nil, so this icmp is always evaluated to true.
if lhsZero && rhsZero {
// Both are zero, so this icmp is always evaluated to true.
fr.locals[inst] = &LocalValue{fr.Eval, llvm.ConstInt(fr.Mod.Context().Int1Type(), 1, false)}
continue
}
if lhsNil != rhsNil {
// Only one of them is nil, so this comparison must return false.
if lhsZero != rhsZero {
// Only one of them is zero, so this comparison must return false.
fr.locals[inst] = &LocalValue{fr.Eval, llvm.ConstInt(fr.Mod.Context().Int1Type(), 0, false)}
continue
}