afd49e7cdd
This adds support for a construct like this:
type foo func(fn foo)
Unfortunately, LLVM cannot create function pointers that look like this.
LLVM only supports named types for structs (not for pointers) and thus
can't add a pointer to a function type of the same type to a parameter
of that function type.
The fix is simple: cast all function pointers to a void function, in
LLVM IR:
void ()*
Raw function pointers are cast to this type before storing, and cast
back to the regular function type before calling. This means that
function parameters will never refer to its own type because raw
function types are fixed at that one type.
Somehow, this does have an effect on binary size in some cases. The
effect is small and goes both ways. On top of that, there is work
underway in LLVM which would make all pointer types opaque (without a
pointee type). This would make this whole commit useless and therefore
should fix any size increases that might happen.
https://llvm.org/docs/OpaquePointers.html
165 строки
6,8 КиБ
LLVM
165 строки
6,8 КиБ
LLVM
; ModuleID = 'goroutine.go'
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source_filename = "goroutine.go"
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7m-unknown-unknown-eabi"
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%runtime.channel = type { i32, i32, i8, %runtime.channelBlockedList*, i32, i32, i32, i8* }
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%runtime.channelBlockedList = type { %runtime.channelBlockedList*, %"internal/task.Task"*, %runtime.chanSelectState*, { %runtime.channelBlockedList*, i32, i32 } }
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%"internal/task.Task" = type { %"internal/task.Task"*, i8*, i64, %"internal/task.state" }
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%"internal/task.state" = type { i32, i32* }
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%runtime.chanSelectState = type { %runtime.channel*, i8* }
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declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*)
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; Function Attrs: nounwind
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define hidden void @main.init(i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @main.regularFunctionGoroutine(i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%stacksize = call i32 @"internal/task.getGoroutineStackSize"(i32 ptrtoint (void (i8*)* @"main.regularFunction$gowrapper" to i32), i8* undef, i8* undef) #0
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call void @"internal/task.start"(i32 ptrtoint (void (i8*)* @"main.regularFunction$gowrapper" to i32), i8* nonnull inttoptr (i32 5 to i8*), i32 %stacksize, i8* undef, i8* null) #0
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ret void
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}
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declare void @main.regularFunction(i32, i8*, i8*)
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; Function Attrs: nounwind
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define linkonce_odr void @"main.regularFunction$gowrapper"(i8* %0) unnamed_addr #1 {
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entry:
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%unpack.int = ptrtoint i8* %0 to i32
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call void @main.regularFunction(i32 %unpack.int, i8* undef, i8* undef) #0
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ret void
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}
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declare i32 @"internal/task.getGoroutineStackSize"(i32, i8*, i8*)
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declare void @"internal/task.start"(i32, i8*, i32, i8*, i8*)
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; Function Attrs: nounwind
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define hidden void @main.inlineFunctionGoroutine(i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%stacksize = call i32 @"internal/task.getGoroutineStackSize"(i32 ptrtoint (void (i8*)* @"main.inlineFunctionGoroutine$1$gowrapper" to i32), i8* undef, i8* undef) #0
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call void @"internal/task.start"(i32 ptrtoint (void (i8*)* @"main.inlineFunctionGoroutine$1$gowrapper" to i32), i8* nonnull inttoptr (i32 5 to i8*), i32 %stacksize, i8* undef, i8* null) #0
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @"main.inlineFunctionGoroutine$1"(i32 %x, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define linkonce_odr void @"main.inlineFunctionGoroutine$1$gowrapper"(i8* %0) unnamed_addr #2 {
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entry:
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%unpack.int = ptrtoint i8* %0 to i32
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call void @"main.inlineFunctionGoroutine$1"(i32 %unpack.int, i8* undef, i8* undef)
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @main.closureFunctionGoroutine(i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%n = call i8* @runtime.alloc(i32 4, i8* undef, i8* null) #0
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%0 = bitcast i8* %n to i32*
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store i32 3, i32* %0, align 4
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%1 = call i8* @runtime.alloc(i32 8, i8* undef, i8* null) #0
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%2 = bitcast i8* %1 to i32*
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store i32 5, i32* %2, align 4
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%3 = getelementptr inbounds i8, i8* %1, i32 4
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%4 = bitcast i8* %3 to i8**
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store i8* %n, i8** %4, align 4
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%stacksize = call i32 @"internal/task.getGoroutineStackSize"(i32 ptrtoint (void (i8*)* @"main.closureFunctionGoroutine$1$gowrapper" to i32), i8* undef, i8* undef) #0
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call void @"internal/task.start"(i32 ptrtoint (void (i8*)* @"main.closureFunctionGoroutine$1$gowrapper" to i32), i8* nonnull %1, i32 %stacksize, i8* undef, i8* null) #0
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%5 = load i32, i32* %0, align 4
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call void @runtime.printint32(i32 %5, i8* undef, i8* null) #0
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @"main.closureFunctionGoroutine$1"(i32 %x, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%unpack.ptr = bitcast i8* %context to i32*
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store i32 7, i32* %unpack.ptr, align 4
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ret void
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}
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; Function Attrs: nounwind
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define linkonce_odr void @"main.closureFunctionGoroutine$1$gowrapper"(i8* %0) unnamed_addr #3 {
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entry:
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%1 = bitcast i8* %0 to i32*
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%2 = load i32, i32* %1, align 4
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%3 = getelementptr inbounds i8, i8* %0, i32 4
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%4 = bitcast i8* %3 to i8**
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%5 = load i8*, i8** %4, align 4
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call void @"main.closureFunctionGoroutine$1"(i32 %2, i8* %5, i8* undef)
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ret void
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}
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declare void @runtime.printint32(i32, i8*, i8*)
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; Function Attrs: nounwind
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define hidden void @main.funcGoroutine(i8* %fn.context, void ()* %fn.funcptr, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = call i8* @runtime.alloc(i32 12, i8* undef, i8* null) #0
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%1 = bitcast i8* %0 to i32*
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store i32 5, i32* %1, align 4
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%2 = getelementptr inbounds i8, i8* %0, i32 4
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%3 = bitcast i8* %2 to i8**
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store i8* %fn.context, i8** %3, align 4
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%4 = getelementptr inbounds i8, i8* %0, i32 8
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%5 = bitcast i8* %4 to void ()**
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store void ()* %fn.funcptr, void ()** %5, align 4
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%stacksize = call i32 @"internal/task.getGoroutineStackSize"(i32 ptrtoint (void (i8*)* @main.funcGoroutine.gowrapper to i32), i8* undef, i8* undef) #0
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call void @"internal/task.start"(i32 ptrtoint (void (i8*)* @main.funcGoroutine.gowrapper to i32), i8* nonnull %0, i32 %stacksize, i8* undef, i8* null) #0
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ret void
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}
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; Function Attrs: nounwind
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define linkonce_odr void @main.funcGoroutine.gowrapper(i8* %0) unnamed_addr #4 {
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entry:
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%1 = bitcast i8* %0 to i32*
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%2 = load i32, i32* %1, align 4
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%3 = getelementptr inbounds i8, i8* %0, i32 4
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%4 = bitcast i8* %3 to i8**
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%5 = load i8*, i8** %4, align 4
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%6 = getelementptr inbounds i8, i8* %0, i32 8
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%7 = bitcast i8* %6 to void (i32, i8*, i8*)**
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%8 = load void (i32, i8*, i8*)*, void (i32, i8*, i8*)** %7, align 4
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call void %8(i32 %2, i8* %5, i8* undef) #0
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @main.recoverBuiltinGoroutine(i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @main.copyBuiltinGoroutine(i8* %dst.data, i32 %dst.len, i32 %dst.cap, i8* %src.data, i32 %src.len, i32 %src.cap, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%copy.n = call i32 @runtime.sliceCopy(i8* %dst.data, i8* %src.data, i32 %dst.len, i32 %src.len, i32 1, i8* undef, i8* null) #0
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ret void
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}
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declare i32 @runtime.sliceCopy(i8* nocapture writeonly, i8* nocapture readonly, i32, i32, i32, i8*, i8*)
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; Function Attrs: nounwind
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define hidden void @main.closeBuiltinGoroutine(%runtime.channel* dereferenceable_or_null(32) %ch, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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call void @runtime.chanClose(%runtime.channel* %ch, i8* undef, i8* null) #0
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ret void
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}
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declare void @runtime.chanClose(%runtime.channel* dereferenceable_or_null(32), i8*, i8*)
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attributes #0 = { nounwind }
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attributes #1 = { nounwind "tinygo-gowrapper"="main.regularFunction" }
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attributes #2 = { nounwind "tinygo-gowrapper"="main.inlineFunctionGoroutine$1" }
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attributes #3 = { nounwind "tinygo-gowrapper"="main.closureFunctionGoroutine$1" }
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attributes #4 = { nounwind "tinygo-gowrapper" }
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