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all: remove LLVM 14 support

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This is a big change: apart from removing LLVM 14 it also removes typed
pointer support (which was only fully supported in LLVM up to version
14). This removes about 200 lines of code, but more importantly removes
a ton of special cases for LLVM 14.
This commit is contained in:
Ayke van Laethem
2023-09-18 17:54:29 +02:00
committed by Ayke
parent c9721197d5
commit 1da1abe314
33 changed files with 247 additions and 467 deletions
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transform/interface-lowering.go
+7 -24
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@@ -92,7 +92,7 @@ type lowerInterfacesPass struct {
ctx llvm.Context
uintptrType llvm.Type
targetData llvm.TargetData
i8ptrType llvm.Type
ptrType llvm.Type
types map[string]*typeInfo
signatures map[string]*signatureInfo
interfaces map[string]*interfaceInfo
@@ -113,7 +113,7 @@ func LowerInterfaces(mod llvm.Module, config *compileopts.Config) error {
ctx: ctx,
targetData: targetData,
uintptrType: mod.Context().IntType(targetData.PointerSize() * 8),
i8ptrType: llvm.PointerType(ctx.Int8Type(), 0),
ptrType: llvm.PointerType(ctx.Int8Type(), 0),
types: make(map[string]*typeInfo),
signatures: make(map[string]*signatureInfo),
interfaces: make(map[string]*interfaceInfo),
@@ -356,11 +356,9 @@ func (p *lowerInterfacesPass) run() error {
}
// Fallback.
if hasUses(t.typecode) {
bitcast := llvm.ConstBitCast(newGlobal, p.i8ptrType)
negativeOffset := -int64(p.targetData.TypeAllocSize(p.i8ptrType))
gep := p.builder.CreateInBoundsGEP(p.ctx.Int8Type(), bitcast, []llvm.Value{llvm.ConstInt(p.ctx.Int32Type(), uint64(negativeOffset), true)}, "")
bitcast2 := llvm.ConstBitCast(gep, t.typecode.Type())
t.typecode.ReplaceAllUsesWith(bitcast2)
negativeOffset := -int64(p.targetData.TypeAllocSize(p.ptrType))
gep := p.builder.CreateInBoundsGEP(p.ctx.Int8Type(), newGlobal, []llvm.Value{llvm.ConstInt(p.ctx.Int32Type(), uint64(negativeOffset), true)}, "")
t.typecode.ReplaceAllUsesWith(gep)
}
t.typecode.EraseFromParentAsGlobal()
newGlobal.SetName(typecodeName)
@@ -514,7 +512,7 @@ func (p *lowerInterfacesPass) defineInterfaceMethodFunc(fn llvm.Value, itf *inte
params[i] = fn.Param(i + 1)
}
params = append(params,
llvm.Undef(p.i8ptrType),
llvm.Undef(p.ptrType),
)
// Start chain in the entry block.
@@ -554,27 +552,12 @@ func (p *lowerInterfacesPass) defineInterfaceMethodFunc(fn llvm.Value, itf *inte
p.builder.SetInsertPointAtEnd(bb)
receiver := fn.FirstParam()
if receiver.Type() != function.FirstParam().Type() {
// When the receiver is a pointer, it is not wrapped. This means the
// i8* has to be cast to the correct pointer type of the target
// function.
receiver = p.builder.CreateBitCast(receiver, function.FirstParam().Type(), "")
}
// Check whether the called function has the same signature as would be
// expected from the parameters. This can happen in rare cases when
// named struct types are renamed after merging multiple LLVM modules.
paramTypes := []llvm.Type{receiver.Type()}
for _, param := range params {
paramTypes = append(paramTypes, param.Type())
}
calledFunctionType := function.Type()
functionType := llvm.FunctionType(returnType, paramTypes, false)
sig := llvm.PointerType(functionType, calledFunctionType.PointerAddressSpace())
if sig != function.Type() {
function = p.builder.CreateBitCast(function, sig, "")
}
retval := p.builder.CreateCall(functionType, function, append([]llvm.Value{receiver}, params...), "")
if retval.Type().TypeKind() == llvm.VoidTypeKind {
p.builder.CreateRetVoid()
@@ -596,7 +579,7 @@ func (p *lowerInterfacesPass) defineInterfaceMethodFunc(fn llvm.Value, itf *inte
// method on a nil interface.
nilPanic := p.mod.NamedFunction("runtime.nilPanic")
p.builder.CreateCall(nilPanic.GlobalValueType(), nilPanic, []llvm.Value{
llvm.Undef(p.i8ptrType),
llvm.Undef(p.ptrType),
}, "")
p.builder.CreateUnreachable()
}