[llvm-dev] Swift to IR, generates wrong IR

[Björn Steinbrink via llvm-dev]

Hi,

2015-10-05 11:49 GMT+02:00 Rinaldini Julien via llvm-dev
<llvm-dev at lists.llvm.org>:
> Sorry, the error is (the previous one was from Apple’s lli):
>
> Documents/strong.codes/code/build/obfuscator-llvm/bin/opt: test.ll:57:203: error: expected comma after getelementptr's type
> @_METACLASS_DATA__TtC4test13TipCalculator = private constant { i32, i32, i32, i32, i8*, i8*, i8*, i8*, i8*, i8*, i8* } { i32 129, i32 40, i32 40, i32 0, i8* null, i8* getelementptr inbounds ([25 x i8]* @7, i64 0, i64 0), i8* null, i8* null, i8* null, i8* null, i8* null }, section "__DATA, __objc_const", align 8

The IR format is not stable and it seems like Swift is using an LLVM <
3.7, while your opt executable is from LLVM 3.7. The `getelementptr`
instruction (besides others) now expects the pointer type to be given
explicitly. I don't know Swift, but if you can get it to emit bitcode
instead of IR, that should work AFAIK. Looking at the command line,
you probably need -emit-bc.

Björn

>                                                         ^
>
>> On 05 Oct 2015, at 11:25, Rinaldini Julien via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>
>> Hi,
>> I have a simple swift code from which I generate IR code with ‘swiftc test.swift -emit-ir -o test.ll'
>> When I try to run the .ll file or apply optimization with opt, I get errors like this one:
>>
>> lli: test.ll:548:110: error: expected instruction opcode
>>  %9 = cmpxchg i64* bitcast (%swift.type*** @field_type_vector_TipCalculator to i64*), i64 0, i64 %8 seq_cst seq_cst
>>                                                                                                                                                                             ^
>> I know swift is not part of the LLVM oss project, but is this problem coming from swift generating wrong IR code or is this a LLVM bug (or maybe I’m just doing something wrong)?
>>
>> Cheers,
>>
>> ps: this is the swift code I try running:
>>
>> class TipCalculator {
>>
>>  // 2
>>  let total: Double
>>    let taxPct: Double
>>    let subtotal: Double
>>
>>    // 3
>>    init(total: Double, taxPct: Double) {a
>>      self.total = total
>>        self.taxPct = taxPct
>>        subtotal = total / (taxPct + 1)
>>    }
>>
>>  // 4
>>  func calcTipWithTipPct(tipPct: Double) -> Double {a
>>    return subtotal * tipPct
>>  }
>>
>>  // 5
>>  func printPossibleTips() {
>>    print("15%: \(calcTipWithTipPct(0.15))")
>>      print("18%: \(calcTipWithTipPct(0.18))")
>>      print("20%: \(calcTipWithTipPct(0.20))")
>>  }
>>
>> }
>>
>> // 6
>> let tipCalc = TipCalculator(total: 33.25, taxPct: 0.06)
>> tipCalc.printPossibleTips()
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