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interp: add support for switch statement

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A switch statement is not normally emitted by the compiler package, but
LLVM function passes may convert a series of if/else pairs to a switch
statement. A future change will run function passes in the package
compile phase, so the interp package (which is also run after all
modules are merged together) will need to deal with these new switch
statements.
This commit is contained in:
Ayke van Laethem
2021-04-05 22:29:53 +02:00
committed by Ron Evans
parent 0b7957d612
commit 04d12bf2ba
4 changed files with 75 additions and 1 deletions
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interp/compiler.go
+9
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@@ -135,6 +135,15 @@ func (r *runner) compileFunction(llvmFn llvm.Value) *function {
default:
panic("unknown number of operands")
}
case llvm.Switch:
// A switch is an array of (value, label) pairs, of which the
// first one indicates the to-switch value and the default
// label.
numOperands := llvmInst.OperandsCount()
for i := 0; i < numOperands; i += 2 {
inst.operands = append(inst.operands, r.getValue(llvmInst.Operand(i)))
inst.operands = append(inst.operands, literalValue{uint32(blockIndices[llvmInst.Operand(i+1)])})
}
case llvm.PHI:
inst.name = llvmInst.Name()
incomingCount := inst.llvmInst.IncomingCount()