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exceptions.go
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/
exceptions.go
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// Copyright (C) 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package codegen
type exceptions struct {
allocFn *Function
throwFn *Function
personalityFn *Function
exceptionTy Type
typeInfos map[Type]Global
}
func (e *exceptions) init(m *Module) {
voidPtr := m.Types.Pointer(m.Types.Void)
e.exceptionTy = m.Types.TypeOf(struct {
*uint8
int32
}{})
e.personalityFn = m.Function(m.Types.Int32, "__gxx_personality_v0", Variadic)
// void* __cxa_allocate_exception(size_t size)
e.allocFn = m.Function(voidPtr, "__cxa_allocate_exception", m.Types.Size)
// void __cxa_throw(void *thrown_object, std::type_info *tinfo, void (*destructor)(void *)) {
e.throwFn = m.Function(m.Types.Void, "__cxa_throw", voidPtr, voidPtr, voidPtr)
e.typeInfos = map[Type]Global{
m.Types.Int: m.Extern("_ZTIi", voidPtr),
m.Types.Uint32: m.Extern("_ZTIj", voidPtr),
m.Types.Uint64: m.Extern("_ZTIm", voidPtr),
}
}
func (e *exceptions) throw(b *Builder, v *Value) {
t := b.m.Types
voidPtr := t.Pointer(b.m.Types.Void)
ex := b.Call(e.allocFn, b.Scalar(v.Type().SizeInBits()/8).Cast(t.Size))
ex.Cast(t.Pointer(v.Type())).Store(v)
ty, ok := e.typeInfos[v.Type()]
if !ok {
fail("Unsuporrted exception type %v", v.Type())
}
destructor := b.Zero(voidPtr)
b.Call(e.throwFn, ex, ty.Value(b).Cast(voidPtr), destructor)
}