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all: refactor reflect package
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.
This commit is contained in:
Ayke van Laethem
committed by
Ron Evans
Ron Evans
parent
ebb410afd9
commit
4e8453167f
Vendored
+19
-19
@@ -1,12 +1,12 @@
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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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%runtime.typecodeID = type { %runtime.typecodeID*, i32, %runtime.interfaceMethodInfo*, %runtime.typecodeID*, i32 }
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%runtime.interfaceMethodInfo = type { i8*, i32 }
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@"reflect/types.type:basic:uint8" = private constant %runtime.typecodeID zeroinitializer
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@"reflect/types.type:basic:int" = private constant %runtime.typecodeID zeroinitializer
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@"reflect/types.type:named:Number" = private constant %runtime.typecodeID { %runtime.typecodeID* @"reflect/types.type:basic:int", i32 0, %runtime.interfaceMethodInfo* null, %runtime.typecodeID* null, i32 0 }
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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.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/types.type:pointer:named:Number" = linkonce_odr constant { i8, i8* } { i8 21, i8* getelementptr inbounds ({ i8, i8*, i8* }, { i8, i8*, i8* }* @"reflect/types.type:named:Number", i32 0, i32 0) }, align 4
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@"reflect/types.type:named:Number" = linkonce_odr constant { i8, i8*, 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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declare void @runtime.printuint8(i8)
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@@ -21,14 +21,14 @@ 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(i32 ptrtoint (%runtime.typecodeID* @"reflect/types.type:basic:int" to i32), i8* inttoptr (i32 5 to i8*))
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call void @printInterface(i32 ptrtoint (%runtime.typecodeID* @"reflect/types.type:basic:uint8" to i32), i8* inttoptr (i8 120 to i8*))
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call void @printInterface(i32 ptrtoint (%runtime.typecodeID* @"reflect/types.type:named:Number" to i32), i8* inttoptr (i32 3 to i8*))
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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* }* @"reflect/types.type:named:Number", i32 0, i32 0), i8* inttoptr (i32 3 to i8*))
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ret void
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}
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define void @printInterface(i32 %typecode, i8* %value) {
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%isUnmatched = call i1 @"Unmatched$typeassert"(i32 %typecode)
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define void @printInterface(i8* %typecode, i8* %value) {
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%isUnmatched = call i1 @"Unmatched$typeassert"(i8* %typecode)
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br i1 %isUnmatched, label %typeswitch.Unmatched, label %typeswitch.notUnmatched
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typeswitch.Unmatched: ; preds = %0
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@@ -38,16 +38,16 @@ typeswitch.Unmatched: ; preds = %0
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ret void
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typeswitch.notUnmatched: ; preds = %0
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%isDoubler = call i1 @"Doubler$typeassert"(i32 %typecode)
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%isDoubler = call i1 @"Doubler$typeassert"(i8* %typecode)
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br i1 %isDoubler, label %typeswitch.Doubler, label %typeswitch.notDoubler
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typeswitch.Doubler: ; preds = %typeswitch.notUnmatched
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%doubler.result = call i32 @"Doubler.Double$invoke"(i8* %value, i32 %typecode, i8* undef)
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%doubler.result = call i32 @"Doubler.Double$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: ; preds = %typeswitch.notUnmatched
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%typeassert.ok = icmp eq i32 ptrtoint (%runtime.typecodeID* @"reflect/types.type:basic:uint8" to i32), %typecode
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%typeassert.ok = icmp eq i8* getelementptr inbounds ({ i8, i8* }, { i8, i8* }* @"reflect/types.type:basic:uint8", i32 0, i32 0), %typecode
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br i1 %typeassert.ok, label %typeswitch.byte, label %typeswitch.notByte
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typeswitch.byte: ; preds = %typeswitch.notDoubler
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@@ -80,9 +80,9 @@ define i32 @"(Number).Double$invoke"(i8* %receiverPtr, i8* %context) {
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ret i32 %ret
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}
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define internal i32 @"Doubler.Double$invoke"(i8* %receiver, i32 %actualType, i8* %context) unnamed_addr #0 {
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define internal i32 @"Doubler.Double$invoke"(i8* %receiver, i8* %actualType, i8* %context) unnamed_addr #0 {
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entry:
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%"named:Number.icmp" = icmp eq i32 %actualType, ptrtoint (%runtime.typecodeID* @"reflect/types.type:named:Number" to i32)
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%"named:Number.icmp" = icmp eq i8* %actualType, getelementptr inbounds ({ i8, i8*, i8* }, { i8, i8*, i8* }* @"reflect/types.type:named:Number", i32 0, i32 0)
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br i1 %"named:Number.icmp", label %"named:Number", label %"named:Number.next"
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"named:Number": ; preds = %entry
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@@ -94,9 +94,9 @@ entry:
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unreachable
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}
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define internal i1 @"Doubler$typeassert"(i32 %actualType) unnamed_addr #1 {
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define internal i1 @"Doubler$typeassert"(i8* %actualType) unnamed_addr #1 {
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entry:
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%"named:Number.icmp" = icmp eq i32 %actualType, ptrtoint (%runtime.typecodeID* @"reflect/types.type:named:Number" to i32)
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%"named:Number.icmp" = icmp eq i8* %actualType, getelementptr inbounds ({ i8, i8*, i8* }, { i8, i8*, i8* }* @"reflect/types.type:named:Number", i32 0, i32 0)
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br i1 %"named:Number.icmp", label %then, label %"named:Number.next"
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then: ; preds = %entry
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@@ -106,7 +106,7 @@ then: ; preds = %entry
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ret i1 false
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}
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define internal i1 @"Unmatched$typeassert"(i32 %actualType) unnamed_addr #2 {
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define internal i1 @"Unmatched$typeassert"(i8* %actualType) unnamed_addr #2 {
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entry:
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ret i1 false
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