Beispiel #1
0
func reorderGlobalConstructors(m llvm.Module) error {
	ctors := m.NamedGlobal("llvm.global_ctors")
	if ctors.IsNil() {
		// No global constructors.
		return nil
	}

	init := ctors.Initializer()
	arraylength := init.Type().ArrayLength()
	zeroindex := []uint32{0}

	// The constructors are ordered within each package, but the packages
	// are in reverse order. We must go backwards through the constructors,
	// reassigning priorities.
	ceiling, npackagectors := -1, -1
	for i := arraylength - 1; i >= 0; i-- {
		indices := []uint32{uint32(i)}
		ctor := llvm.ConstExtractValue(init, indices)
		priority := int(llvm.ConstExtractValue(ctor, zeroindex).ZExtValue())
		if npackagectors == -1 {
			ceiling = arraylength - (i + 1) + priority
			npackagectors = priority
		}
		newpriority := ceiling - (npackagectors - priority)
		newpriorityvalue := llvm.ConstInt(llvm.Int32Type(), uint64(newpriority), false)
		ctor = llvm.ConstInsertValue(ctor, newpriorityvalue, zeroindex)
		if priority == 1 {
			npackagectors = -1
		}
		init = llvm.ConstInsertValue(init, ctor, indices)
	}
	ctors.SetInitializer(init)
	return nil
}
Beispiel #2
0
func getFflush(module llvm.Module) llvm.Value {
	fflush := module.NamedFunction("fflush")
	if fflush.IsNil() {
		voidPtr := llvm.PointerType(llvm.Int8Type(), 0)
		ftyp := llvm.FunctionType(llvm.Int32Type(), []llvm.Type{voidPtr}, false)
		fflush = llvm.AddFunction(module, "fflush", ftyp)
		fflush.SetFunctionCallConv(llvm.CCallConv)
	}
	return fflush
}
Beispiel #3
0
func getPrintf(module llvm.Module) llvm.Value {
	printf := module.NamedFunction("printf")
	if printf.IsNil() {
		charPtr := llvm.PointerType(llvm.Int8Type(), 0)
		ftyp := llvm.FunctionType(llvm.Int32Type(), []llvm.Type{charPtr}, true)
		printf = llvm.AddFunction(module, "printf", ftyp)
		printf.SetFunctionCallConv(llvm.CCallConv)
	}
	return printf
}
Beispiel #4
0
func getnewgoroutine(module llvm.Module) llvm.Value {
	fn := module.NamedFunction("llgo_newgoroutine")
	if fn.IsNil() {
		i8Ptr := llvm.PointerType(llvm.Int8Type(), 0)
		VoidFnPtr := llvm.PointerType(llvm.FunctionType(
			llvm.VoidType(), []llvm.Type{i8Ptr}, false), 0)
		i32 := llvm.Int32Type()
		fn_type := llvm.FunctionType(
			llvm.VoidType(), []llvm.Type{VoidFnPtr, i8Ptr, i32}, true)
		fn = llvm.AddFunction(module, "llgo_newgoroutine", fn_type)
		fn.SetFunctionCallConv(llvm.CCallConv)
	}
	return fn
}