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compiler: support function pointers outside of addrspace 0

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In LLVM 8, the AVR backend has moved all function pointers to address
space 1 by default. Much of the code still assumes function pointers
live in address space 0, leading to assertion failures.

This commit fixes this problem by autodetecting function pointers and
avoiding them in interface pseudo-calls.
This commit is contained in:
Ayke van Laethem
2019-01-01 20:22:39 +01:00
committed by Ron Evans
parent c7fdb6741f
commit c7b91da8c4
4 changed files with 29 additions and 23 deletions
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src/runtime/interface.go
+3 -3
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@@ -39,8 +39,8 @@ func interfaceTypeAssert(ok bool) {
// See compiler/interface-lowering.go for details.
type interfaceMethodInfo struct {
signature *uint8 // external *i8 with a name identifying the Go function signature
funcptr *uint8 // bitcast from the actual function pointer
signature *uint8 // external *i8 with a name identifying the Go function signature
funcptr uintptr // bitcast from the actual function pointer
}
// Pseudo function call used while putting a concrete value in an interface,
@@ -59,4 +59,4 @@ func interfaceImplements(typecode uintptr, interfaceMethodSet **uint8) bool
// Pseudo function that returns a function pointer to the method to call.
// See the interface lowering pass for how this is lowered to a real call.
func interfaceMethod(typecode uintptr, interfaceMethodSet **uint8, signature *uint8) *uint8
func interfaceMethod(typecode uintptr, interfaceMethodSet **uint8, signature *uint8) uintptr