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9a8f2ed642
SROA and Mem2Reg now can leverage DIExpression -- op_fragment, more specifically -- to generate correct debug info for optimized SIL. Some important highlights: - The new swift::salvageDebugInfo, similar to llvm::salvageDebugInfo, tries to restore / transfer debug info from a deleted instruction. Currently I only implemented this for store instruction whose destination is an alloc_stack value. - Since we now have source-variable-specific SIL location inside a `debug_value` instruction (and its friends), this patch teaches SILCloner and SILInliner to remap the debug scope there in addition to debug scope of the instruction. - DCE now does not remove `debug_value` instruction whose associating with a function argument SSA value that is not used elsewhere. Since that SSA value will not disappear so we should keep the debug info.
33 lines
727 B
Swift
33 lines
727 B
Swift
// RUN: %target-swift-frontend -O -emit-sil -parse-as-library %s | %FileCheck %s
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protocol E {
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func f() -> Bool
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}
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protocol P {
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associatedtype A = Int
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}
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public struct X : P, E {
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func f() -> Bool { return true }
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}
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func g<T : P>(_ x : T) -> Bool {
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if let y = x as? E { return y.f() }
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return false
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}
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// Check that this function can be completely constant folded and no alloc_stack remains.
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// CHECK-LABEL: sil @$s16dead_alloc_stack6testitySbAA1XVF
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// CHECK: bb0({{.*}}):
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// CHECK-NEXT: debug_value
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// CHECK-NEXT: integer_literal
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// CHECK-NEXT: struct
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// CHECK-NEXT: return
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// CHECK-NEXT: } // end sil function '$s16dead_alloc_stack6testitySbAA1XVF'
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public func testit(_ x: X) -> Bool {
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return g(x)
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}
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