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cfg.go
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cfg.go
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/*
* Copyright 2022 ByteDance 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 ssa
import (
`sync/atomic`
`github.com/cloudwego/frugal/internal/atm/abi`
)
type _CFGPrivate struct {
reg uint64
block uint64
}
func (self *_CFGPrivate) allocreg() int {
return int(atomic.AddUint64(&self.reg, 1)) - 1
}
func (self *_CFGPrivate) allocblock() int {
return int(atomic.AddUint64(&self.block, 1)) - 1
}
type CFG struct {
_CFGPrivate
Func FuncData
Root *BasicBlock
Depth map[int]int
Layout *abi.FunctionLayout
DominatedBy map[int]*BasicBlock
DominatorOf map[int][]*BasicBlock
DominanceFrontier map[int][]*BasicBlock
}
func (self *CFG) Rebuild() {
updateDominatorTree(self)
updateDominatorDepth(self)
updateDominatorFrontier(self)
}
func (self *CFG) MaxBlock() int {
return int(self.block)
}
func (self *CFG) PostOrder() *BasicBlockIter {
return newBasicBlockIter(self)
}
func (self *CFG) CreateBlock() (r *BasicBlock) {
r = new(BasicBlock)
r.Id = self.allocblock()
return
}
func (self *CFG) CreateRegister(ptr bool) Reg {
if i := self.allocreg(); ptr {
return mkreg(1, K_norm, 0).Derive(i)
} else {
return mkreg(0, K_norm, 0).Derive(i)
}
}
func (self *CFG) CreateUnreachable(bb *BasicBlock) (ret *BasicBlock) {
ret = self.CreateBlock()
ret.Ins = []IrNode { new(IrBreakpoint) }
ret.Term = &IrSwitch { Ln: IrLikely(ret) }
ret.Pred = []*BasicBlock { bb, ret }
return
}