target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" target triple = "wasm32-unknown-unknown-wasm" %runtime.funcValueWithSignature = type { i32, i8* } @"reflect/types.funcid:func:{basic:uint8}{}" = external constant i8 @"reflect/types.funcid:func:{basic:int}{}" = external constant i8 @"reflect/types.funcid:func:{}{basic:uint32}" = external constant i8 @"func1Uint8$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i8, i8*, i8*)* @func1Uint8 to i32), i8* @"reflect/types.funcid:func:{basic:uint8}{}" } @"func2Uint8$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i8, i8*, i8*)* @func2Uint8 to i32), i8* @"reflect/types.funcid:func:{basic:uint8}{}" } @"main$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @"main$1" to i32), i8* @"reflect/types.funcid:func:{basic:int}{}" } @"main$2$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @"main$2" to i32), i8* @"reflect/types.funcid:func:{basic:int}{}" } declare i32 @runtime.getFuncPtr(i8*, i32, i8*, i8*, i8*) declare void @"internal/task.start"(i32, i8*, i32, i8*, i8*) declare void @runtime.nilPanic(i8*, i8*) declare void @"main$1"(i32, i8*, i8*) declare void @"main$2"(i32, i8*, i8*) declare void @func1Uint8(i8, i8*, i8*) declare void @func2Uint8(i8, i8*, i8*) ; There are no functions with this signature used in a func value. ; This means that this should unconditionally nil panic. define i32 @runFuncNone(i8*, i32, i8* %context, i8* %parentHandle) { entry: %2 = call i32 @runtime.getFuncPtr(i8* %0, i32 %1, i8* @"reflect/types.funcid:func:{}{basic:uint32}", i8* undef, i8* null) %3 = inttoptr i32 %2 to i32 (i8*, i8*)* %4 = icmp eq i32 (i8*, i8*)* %3, null br i1 %4, label %fpcall.nil, label %fpcall.next fpcall.nil: call void @runtime.nilPanic(i8* undef, i8* null) unreachable fpcall.next: %5 = call i32 %3(i8* %0, i8* undef) ret i32 %5 } ; There are two functions with this signature used in a func value. That means ; that we'll have to check at runtime which of the two it is (or whether the ; func value is nil). This call will thus be lowered to a switch statement. define void @runFunc2(i8*, i32, i8, i8* %context, i8* %parentHandle) { entry: %3 = call i32 @runtime.getFuncPtr(i8* %0, i32 %1, i8* @"reflect/types.funcid:func:{basic:uint8}{}", i8* undef, i8* null) %4 = inttoptr i32 %3 to void (i8, i8*, i8*)* %5 = icmp eq void (i8, i8*, i8*)* %4, null br i1 %5, label %fpcall.nil, label %fpcall.next fpcall.nil: call void @runtime.nilPanic(i8* undef, i8* null) unreachable fpcall.next: call void %4(i8 %2, i8* %0, i8* undef) ret void } ; Special case for internal/task.start. define void @sleepFuncValue(i8*, i32, i8* nocapture readnone %context, i8* nocapture readnone %parentHandle) { entry: %2 = call i32 @runtime.getFuncPtr(i8* %0, i32 %1, i8* @"reflect/types.funcid:func:{basic:int}{}", i8* undef, i8* null) call void @"internal/task.start"(i32 %2, i8* null, i32 undef, i8* undef, i8* null) ret void }