4e8453167f
This is a big commit that changes the way runtime type information is stored in
the binary. Instead of compressing it and storing it in a number of sidetables,
it is stored similar to how the Go compiler toolchain stores it (but still more
compactly).
This has a number of advantages:
* It is much easier to add new features to reflect support. They can simply
be added to these structs without requiring massive changes (especially in
the reflect lowering pass).
* It removes the reflect lowering pass, which was a large amount of hard to
understand and debug code.
* The reflect lowering pass also required merging all LLVM IR into one
module, which is terrible for performance especially when compiling large
amounts of code. See issue 2870 for details.
* It is (probably!) easier to reason about for the compiler.
The downside is that it increases code size a bit, especially when reflect is
involved. I hope to fix some of that in later patches.
95 строки
4,9 КиБ
LLVM
95 строки
4,9 КиБ
LLVM
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7m-none-eabi"
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@"reflect/types.type:basic:uint8" = linkonce_odr constant { i8, i8* } { i8 8, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:pointer:basic:uint8", i32 0, i32 0) }, align 4
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@"reflect/types.type:pointer:basic:uint8" = linkonce_odr constant { i8, i8* } { i8 21, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:basic:uint8", i32 0, i32 0) }, align 4
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@"reflect/types.typeid:basic:uint8" = external constant i8
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@"reflect/types.typeid:basic:int16" = external constant i8
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@"reflect/types.type:basic:int" = linkonce_odr constant { i8, i8* } { i8 2, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:pointer:basic:int", i32 0, i32 0) }, align 4
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@"reflect/types.type:pointer:basic:int" = linkonce_odr constant { i8, i8* } { i8 21, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:basic:int", i32 0, i32 0) }, align 4
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@"reflect/methods.NeverImplementedMethod()" = linkonce_odr constant i8 0
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@"reflect/methods.Double() int" = linkonce_odr constant i8 0
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@"Number$methodset" = linkonce_odr unnamed_addr constant { i32, [1 x i8*], { i32 (i8*, i8*)* } } { i32 1, [1 x i8*] [i8* @"reflect/methods.Double() int"], { i32 (i8*, i8*)* } { i32 (i8*, i8*)* @"(Number).Double$invoke" } }
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@"reflect/types.type:named:Number" = linkonce_odr constant { i8*, i8, i8*, i8* } { i8* bitcast ({ i32, [1 x i8*], { i32 (i8*, i8*)* } }* @"Number$methodset" to i8*), i8 34, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:pointer:named:Number", i32 0, i32 0), i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:basic:int", i32 0, i32 0) }, align 4
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@"reflect/types.type:pointer:named:Number" = linkonce_odr constant { i8, i8* } { i8 21, i8* getelementptr inbounds ({ i8*, i8, i8*, i8* }, { i8*, i8, i8*, i8* }* @"reflect/types.type:named:Number", i32 0, i32 1) }, align 4
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declare i1 @runtime.typeAssert(i8*, i8*)
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declare void @runtime.printuint8(i8)
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declare void @runtime.printint16(i16)
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declare void @runtime.printint32(i32)
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declare void @runtime.printptr(i32)
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declare void @runtime.printnl()
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declare void @runtime.nilPanic(i8*)
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define void @printInterfaces() {
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call void @printInterface(i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:basic:int", i32 0, i32 0), i8* inttoptr (i32 5 to i8*))
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call void @printInterface(i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:basic:uint8", i32 0, i32 0), i8* inttoptr (i8 120 to i8*))
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call void @printInterface(i8* getelementptr inbounds ({ i8*, i8, i8*, i8* }, { i8*, i8, i8*, i8* }* @"reflect/types.type:named:Number", i32 0, i32 1), i8* inttoptr (i32 3 to i8*))
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ret void
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}
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define void @printInterface(i8* %typecode, i8* %value) {
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%isUnmatched = call i1 @Unmatched$typeassert(i8* %typecode)
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br i1 %isUnmatched, label %typeswitch.Unmatched, label %typeswitch.notUnmatched
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typeswitch.Unmatched:
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%unmatched = ptrtoint i8* %value to i32
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call void @runtime.printptr(i32 %unmatched)
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call void @runtime.printnl()
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ret void
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typeswitch.notUnmatched:
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%isDoubler = call i1 @Doubler$typeassert(i8* %typecode)
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br i1 %isDoubler, label %typeswitch.Doubler, label %typeswitch.notDoubler
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typeswitch.Doubler:
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%doubler.result = call i32 @"Doubler.Double$invoke"(i8* %value, i8* %typecode, i8* undef)
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call void @runtime.printint32(i32 %doubler.result)
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ret void
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typeswitch.notDoubler:
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%isByte = call i1 @runtime.typeAssert(i8* %typecode, i8* nonnull @"reflect/types.typeid:basic:uint8")
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br i1 %isByte, label %typeswitch.byte, label %typeswitch.notByte
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typeswitch.byte:
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%byte = ptrtoint i8* %value to i8
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call void @runtime.printuint8(i8 %byte)
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call void @runtime.printnl()
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ret void
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typeswitch.notByte:
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; this is a type assert that always fails
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%isInt16 = call i1 @runtime.typeAssert(i8* %typecode, i8* nonnull @"reflect/types.typeid:basic:int16")
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br i1 %isInt16, label %typeswitch.int16, label %typeswitch.notInt16
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typeswitch.int16:
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%int16 = ptrtoint i8* %value to i16
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call void @runtime.printint16(i16 %int16)
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call void @runtime.printnl()
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ret void
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typeswitch.notInt16:
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ret void
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}
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define i32 @"(Number).Double"(i32 %receiver, i8* %context) {
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%ret = mul i32 %receiver, 2
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ret i32 %ret
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}
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define i32 @"(Number).Double$invoke"(i8* %receiverPtr, i8* %context) {
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%receiver = ptrtoint i8* %receiverPtr to i32
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%ret = call i32 @"(Number).Double"(i32 %receiver, i8* undef)
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ret i32 %ret
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}
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declare i32 @"Doubler.Double$invoke"(i8* %receiver, i8* %typecode, i8* %context) #0
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declare i1 @Doubler$typeassert(i8* %typecode) #1
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declare i1 @Unmatched$typeassert(i8* %typecode) #2
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attributes #0 = { "tinygo-invoke"="reflect/methods.Double() int" "tinygo-methods"="reflect/methods.Double() int" }
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attributes #1 = { "tinygo-methods"="reflect/methods.Double() int" }
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attributes #2 = { "tinygo-methods"="reflect/methods.NeverImplementedMethod()" }
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