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compiler: decouple func lowering from interface type codes

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There is no good reason for func values to refer to interface type
codes. The only thing they need is a stable identifier for function
signatures, which is easily created as a new kind of globals. Decoupling
makes it easier to change interface related code.
This commit is contained in:
Ayke van Laethem
2021-04-11 02:00:01 +02:00
committed by Ron Evans
parent 8383552552
commit 57271d7eaa
8 changed files with 48 additions and 45 deletions
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compiler/testdata/func.ll
Vendored
+5 -7
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@@ -3,12 +3,10 @@ source_filename = "func.go"
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"
target triple = "i686--linux"
%runtime.typecodeID = type { %runtime.typecodeID*, i32, %runtime.interfaceMethodInfo* }
%runtime.interfaceMethodInfo = type { i8*, i32 }
%runtime.funcValueWithSignature = type { i32, %runtime.typecodeID* }
%runtime.funcValueWithSignature = type { i32, i8* }
@"reflect/types.type:func:{basic:int}{}" = linkonce_odr constant %runtime.typecodeID zeroinitializer
@"main.someFunc$withSignature" = linkonce_odr constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @main.someFunc to i32), %runtime.typecodeID* @"reflect/types.type:func:{basic:int}{}" }
@"reflect/types.funcid:func:{basic:int}{}" = external constant i8
@"main.someFunc$withSignature" = linkonce_odr constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @main.someFunc to i32), i8* @"reflect/types.funcid:func:{basic:int}{}" }
declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*)
@@ -19,7 +17,7 @@ entry:
define hidden void @main.foo(i8* %callback.context, i32 %callback.funcptr, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%0 = call i32 @runtime.getFuncPtr(i8* %callback.context, i32 %callback.funcptr, %runtime.typecodeID* nonnull @"reflect/types.type:func:{basic:int}{}", i8* undef, i8* null)
%0 = call i32 @runtime.getFuncPtr(i8* %callback.context, i32 %callback.funcptr, i8* nonnull @"reflect/types.funcid:func:{basic:int}{}", i8* undef, i8* null)
%1 = icmp eq i32 %0, 0
br i1 %1, label %fpcall.throw, label %fpcall.next
@@ -33,7 +31,7 @@ fpcall.next: ; preds = %entry
ret void
}
declare i32 @runtime.getFuncPtr(i8*, i32, %runtime.typecodeID* dereferenceable_or_null(12), i8*, i8*)
declare i32 @runtime.getFuncPtr(i8*, i32, i8* dereferenceable_or_null(1), i8*, i8*)
declare void @runtime.nilPanic(i8*, i8*)