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.
28 строки
2,2 КиБ
LLVM
28 строки
2,2 КиБ
LLVM
target datalayout = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-f64:32:64-f80:32-n8:16:32-S128"
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target triple = "i686--linux"
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@"reflect/types.type:named:error" = internal constant { i8, i8*, i8* } { i8 52, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:pointer:named:error", i32 0, i32 0), i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:interface:{Error:func:{}{basic:string}}", i32 0, i32 0) }, align 4
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@"reflect/types.type:interface:{Error:func:{}{basic:string}}" = internal constant { i8, i8* } { i8 20, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}", i32 0, i32 0) }, align 4
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@"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" = internal constant { i8, i8* } { i8 21, i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:interface:{Error:func:{}{basic:string}}", i32 0, i32 0) }, align 4
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@"reflect/types.type:pointer:named:error" = internal constant { i8, i8* } { i8 21, i8* getelementptr inbounds ({ i8, i8*, i8* }, { i8, i8*, i8* }* @"reflect/types.type:named:error", i32 0, i32 0) }, align 4
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@"reflect/types.type:pointer:named:reflect.rawType" = internal constant { i8*, i8, i8* } { i8* null, i8 21, i8* null }, align 4
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@"reflect/methods.Implements(reflect.Type) bool" = internal constant i8 0, align 1
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define i1 @main.isError(i8* %typ.typecode, i8* %typ.value, i8* %context) {
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entry:
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%0 = call i1 @"interface:{Error:func:{}{basic:string}}.$typeassert"(i8* %typ.value)
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ret i1 %0
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}
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define i1 @main.isUnknown(i8* %typ.typecode, i8* %typ.value, i8* %itf.typecode, i8* %itf.value, i8* %context) {
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entry:
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%result = call i1 @"reflect.Type.Implements$invoke"(i8* %typ.value, i8* %itf.typecode, i8* %itf.value, i8* %typ.typecode, i8* undef)
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ret i1 %result
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}
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declare i1 @"reflect.Type.Implements$invoke"(i8*, i8*, i8*, i8*, i8*) #0
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declare i1 @"interface:{Error:func:{}{basic:string}}.$typeassert"(i8*) #1
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attributes #0 = { "tinygo-invoke"="reflect/methods.Implements(reflect.Type) bool" "tinygo-methods"="reflect/methods.Align() int; reflect/methods.Implements(reflect.Type) bool" }
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attributes #1 = { "tinygo-methods"="reflect/methods.Error() string" }
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