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ca27e829ba
The initial version of the debugger testing transform instruments
assignments in a way that allows the debugger to sanity-check its
expression evaluator.
Given an assignment expression of the form:
```
a = b
```
The transform rewrites the relevant bits of the AST to look like this:
```
{ () -> () in
a = b
checkExpect("a", stringForPrintObject(a))
}()
```
The purpose of the rewrite is to make it easier to exercise the
debugger's expression evaluator in new contexts. This can be automated
by having the debugger set a breakpoint on checkExpect, running `expr
$Varname`, and comparing the result to the expected value generated by
the runtime.
While the initial version of this testing transform only supports
instrumenting assignments, it should be simple to teach it to do more
interesting rewrites.
There's a driver script available in SWIFT_BIN_DIR/lldb-check-expect to
simplfiy the process of launching and testing instrumented programs.
rdar://36032055
103 lines
2.7 KiB
Swift
103 lines
2.7 KiB
Swift
// RUN: %target-run-simple-swift
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// REQUIRES: executable_test
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import StdlibUnittest
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struct StructWithMembers {
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var a = 1
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var b = "Hello World"
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}
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class ClassWithMembers {
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var a = 1
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var b = "Hello World"
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}
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class ClassWithMirror: CustomReflectable {
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var customMirror: Mirror {
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return Mirror(self, children: ["a" : 1, "b" : "Hello World"])
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}
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}
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#if _runtime(_ObjC)
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struct DontBridgeThisStruct {
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var message = "Hello World"
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}
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extension DontBridgeThisStruct : _ObjectiveCBridgeable {
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typealias _ObjectiveCType = AnyObject
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func _bridgeToObjectiveC() -> _ObjectiveCType {
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fatalError("tried to bridge DontBridgeThisStruct")
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}
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static func _forceBridgeFromObjectiveC(
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_ source: _ObjectiveCType,
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result: inout DontBridgeThisStruct?
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) {
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result = nil
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}
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static func _conditionallyBridgeFromObjectiveC(
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_ source: _ObjectiveCType,
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result: inout DontBridgeThisStruct?
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) -> Bool {
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result = nil
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return false
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}
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static func _unconditionallyBridgeFromObjectiveC(_ source: _ObjectiveCType?)
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-> DontBridgeThisStruct {
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return DontBridgeThisStruct()
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}
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}
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#endif
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let StringForPrintObjectTests = TestSuite("StringForPrintObject")
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StringForPrintObjectTests.test("StructWithMembers") {
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let printed = _stringForPrintObject(StructWithMembers())
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expectEqual(printed, "▿ StructWithMembers\n - a : 1\n - b : \"Hello World\"\n")
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}
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#if _runtime(_ObjC)
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StringForPrintObjectTests.test("ClassWithMembers") {
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let printed = _stringForPrintObject(ClassWithMembers())
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expectTrue(printed.hasPrefix("<ClassWithMembers: 0x"))
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}
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#endif
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StringForPrintObjectTests.test("ClassWithMirror") {
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let printed = _stringForPrintObject(ClassWithMirror())
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expectEqual(printed, "▿ ClassWithMirror\n - a : 1\n - b : \"Hello World\"\n")
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}
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StringForPrintObjectTests.test("Array") {
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let printed = _stringForPrintObject([1,2,3,4])
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expectEqual(printed, "▿ 4 elements\n - 0 : 1\n - 1 : 2\n - 2 : 3\n - 3 : 4\n")
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}
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StringForPrintObjectTests.test("Dictionary") {
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let printed = _stringForPrintObject([1:2])
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expectEqual("▿ 1 element\n ▿ 0 : 2 elements\n - key : 1\n - value : 2\n",
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printed)
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}
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StringForPrintObjectTests.test("NilOptional") {
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let printed = _stringForPrintObject(nil as Int?)
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expectEqual(printed, "nil\n")
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}
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StringForPrintObjectTests.test("SomeOptional") {
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let printed = _stringForPrintObject(3 as Int?)
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expectEqual(printed, "▿ Optional<Int>\n - some : 3\n")
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}
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#if _runtime(_ObjC)
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StringForPrintObjectTests.test("DontBridgeThisStruct") {
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let printed = _stringForPrintObject(DontBridgeThisStruct())
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expectEqual(printed, "▿ DontBridgeThisStruct\n - message : \"Hello World\"\n")
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}
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#endif
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runAllTests()
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