FixedPointArithmeticTraps.swift.gyb

// RUN: %empty-directory(%t)
// RUN: %gyb %s -o %t/FixedPointArithmeticTraps.swift
// RUN: %line-directive %t/FixedPointArithmeticTraps.swift -- %target-build-swift %t/FixedPointArithmeticTraps.swift -o %t/a.out_Debug -Onone
// RUN: %line-directive %t/FixedPointArithmeticTraps.swift -- %target-build-swift %t/FixedPointArithmeticTraps.swift -o %t/a.out_Release -O
//
// RUN: %line-directive %t/FixedPointArithmeticTraps.swift -- %target-run %t/a.out_Debug
// RUN: %line-directive %t/FixedPointArithmeticTraps.swift -- %target-run %t/a.out_Release
// REQUIRES: executable_test

import StdlibUnittest


// Note: in this file, we need to go through opaque functions to load
// constants.  This is to check runtime behavior and ensure the constant is
// not folded.

func expectOverflow<T>(
  _ res: (partialValue: T, overflow: Bool),
  //===--- TRACE boilerplate ----------------------------------------------===//
  _ message: @autoclosure () -> String = "",
    showFrame: Bool = true,
    stackTrace: SourceLocStack = SourceLocStack(),
    file: String = #file, line: UInt = #line
) {
  expectTrue(
    res.overflow, "expected overflow",
    stackTrace: stackTrace.pushIf(showFrame, file: file, line: line))
}

func expectNoOverflow<T>(
  _ res: (partialValue: T, overflow: Bool),
  //===--- TRACE boilerplate ----------------------------------------------===//
  _ message: @autoclosure () -> String = "",
    showFrame: Bool = true,
    stackTrace: SourceLocStack = SourceLocStack(),
    file: String = #file, line: UInt = #line
) {
  expectFalse(
    res.overflow, "expected no overflow",
    stackTrace: stackTrace.pushIf(showFrame, file: file, line: line))
}

%{

from SwiftIntTypes import all_integer_types

# Test cases are written in a way that they don't depend on the word size.
word_bits = 4

}%

var FixedPointArithmeticTraps = TestSuite("FixedPointArithmeticTraps")

% for self_ty in all_integer_types(word_bits):
%   IntTy = self_ty.stdlib_name

//
// Test pre- and post-increment/decrement for ${IntTy}
//

FixedPointArithmeticTraps.test("PreDecrement/${IntTy}") {
  var x = get${IntTy}(${IntTy}.min)
  x += 1

  x = get${IntTy}(${IntTy}.min)
  expectCrashLater()
  // IntTy.min -= 1
  x -= 1
  _blackHole(x)
}

FixedPointArithmeticTraps.test("PreIncrement/${IntTy}") {
  var x = get${IntTy}(${IntTy}.max)
  x -= 1

  x = get${IntTy}(${IntTy}.max)
  expectCrashLater()
  // IntTy.max += 1
  x += 1
  _blackHole(x)
}

FixedPointArithmeticTraps.test("PostDecrement/${IntTy}") {
  var x = get${IntTy}(${IntTy}.min)
  x += 1

  x = get${IntTy}(${IntTy}.min)
  expectCrashLater()
  // IntTy.min -= 1
  x -= 1
  _blackHole(x)
}

FixedPointArithmeticTraps.test("PostIncrement/${IntTy}") {
  var x = get${IntTy}(${IntTy}.max)
  x -= 1

  x = get${IntTy}(${IntTy}.max)
  expectCrashLater()
  // IntTy.max += 1
  x += 1
  _blackHole(x)
}

//
// Test addition for ${IntTy}
//

FixedPointArithmeticTraps.test("Addition/${IntTy}") {
  var a = get${IntTy}(${IntTy}.max / 3)

  expectNoOverflow(a.addingReportingOverflow(get${IntTy}(${IntTy}.max / 3)))
  a = a + get${IntTy}(${IntTy}.max / 3)

  expectNoOverflow(a.addingReportingOverflow(get${IntTy}(${IntTy}.max / 3)))
  a = a + get${IntTy}(${IntTy}.max / 3)

  // Overflow in addition.
  expectOverflow(a.addingReportingOverflow(get${IntTy}(${IntTy}.max / 3)))
  expectCrashLater()
  a = a + get${IntTy}(${IntTy}.max / 3)
  _blackHole(a)
}

//
// Test subtraction for ${IntTy}
//

FixedPointArithmeticTraps.test("Subtraction/${IntTy}") {
  var a = get${IntTy}(${IntTy}.min + get${IntTy}(${IntTy}.max / 3))

  expectNoOverflow(a.subtractingReportingOverflow(get${IntTy}(${IntTy}.max / 3)))
  a = a - get${IntTy}(${IntTy}.max / 3)

  // Overflow in subtraction.
  expectOverflow(a.subtractingReportingOverflow(get${IntTy}(${IntTy}.max / 3)))
  expectCrashLater()
  a = a - get${IntTy}(${IntTy}.max / 3)
  _blackHole(a)
}

//
// Test multiplication for ${IntTy}
//

FixedPointArithmeticTraps.test("Multiplication/${IntTy}") {
  var a = get${IntTy}(${IntTy}.max / 3)

  expectNoOverflow(a.multipliedReportingOverflow(by: get${IntTy}(2)))
  a = a * get${IntTy}(2)

  // Overflow in multiplication.
  expectOverflow(a.multipliedReportingOverflow(by: get${IntTy}(2)))
  expectCrashLater()
  a = a * get${IntTy}(2)
  _blackHole(a)
}

//
// Test division for ${IntTy}
//

FixedPointArithmeticTraps.test("Division/${IntTy}") {
  var a = get${IntTy}(${IntTy}.max / 3)

  // x / 3
  expectNoOverflow(a.dividedReportingOverflow(by: get${IntTy}(3)))
  a = a / get${IntTy}(3)

  // x / 0
  expectOverflow(a.dividedReportingOverflow(by: get${IntTy}(0)))
  expectCrashLater()
  a = a / get${IntTy}(0)
}

%   if self_ty.is_signed:

FixedPointArithmeticTraps.test("Division/${IntTy}.min-over-minus-one") {
  var a = get${IntTy}(${IntTy}.min)

  expectNoOverflow(a.dividedReportingOverflow(by: get${IntTy}(3)))
  a = a / get${IntTy}(3)

  a = get${IntTy}(${IntTy}.min)
  expectOverflow(a.dividedReportingOverflow(by: get${IntTy}(-1)))
  expectCrashLater()
  a = a / get${IntTy}(-1)
  // IntTy.min / -1
  _blackHole(a)
}

%   end

//
// Test remainder computation for ${IntTy}
//

FixedPointArithmeticTraps.test("Remainder/${IntTy}") {
  var a = get${IntTy}(${IntTy}.max / 3)

  // x % 3
  expectNoOverflow(a.remainderReportingOverflow(dividingBy: get${IntTy}(3)))
  a = a % get${IntTy}(3)

  // x % 0
  expectOverflow(a.remainderReportingOverflow(dividingBy: get${IntTy}(0)))
  expectCrashLater()
  a = a % get${IntTy}(0)
  _blackHole(a)
}

%   if self_ty.is_signed:

FixedPointArithmeticTraps.test("Remainder/${IntTy}.min-mod-minus-one") {
  var a = get${IntTy}(${IntTy}.min)

  // Int.min % 3
  expectNoOverflow(a.remainderReportingOverflow(dividingBy: get${IntTy}(3)))
  a = a % get${IntTy}(3)

  // Int.min % -1
  a = get${IntTy}(${IntTy}.min)
  expectOverflow(a.remainderReportingOverflow(dividingBy: get${IntTy}(-1)))
  expectCrashLater()
  a = a % get${IntTy}(-1)
  _blackHole(a)
}

%   end

// This comment prevents gyb from miscompiling this file.
// <rdar://problem/17548877> gyb miscompiles a certain for loop

% end

runAllTests()