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delete.go
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delete.go
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// Copyright (C) 2019 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 resolve
import (
"context"
"fmt"
"math"
"github.com/google/gapid/core/memory/arena"
"github.com/google/gapid/gapis/api"
"github.com/google/gapid/gapis/capture"
"github.com/google/gapid/gapis/database"
"github.com/google/gapid/gapis/service/path"
)
// Delete creates a copy of the capture referenced by p, but without the object, value
// or memory at p. The path returned is identical to p, but with
// the base changed to refer to the new capture.
func Delete(ctx context.Context, p *path.Any, r *path.ResolveConfig) (*path.Any, error) {
obj, err := database.Build(ctx, &DeleteResolvable{Path: p, Config: r})
if err != nil {
return nil, err
}
return obj.(*path.Any), nil
}
// Resolve implements the database.Resolver interface.
func (r *DeleteResolvable) Resolve(ctx context.Context) (interface{}, error) {
ctx = SetupContext(ctx, path.FindCapture(r.Path.Node()), r.Config)
p, err := deleteCommand(ctx, arena.New(), r.Path.Node())
if err != nil {
return nil, err
}
return p.Path(), nil
}
func deleteCommand(ctx context.Context, a arena.Arena, p path.Node) (*path.Capture, error) {
switch p := p.(type) {
case *path.Command:
if len(p.Indices) > 1 {
return nil, fmt.Errorf("Cannot modify subcommands") // TODO: Subcommands
}
cmdIdx := p.Indices[0]
// Resolve the command list
oldCmds, err := NCmds(ctx, p.Capture, cmdIdx+1)
if err != nil {
return nil, err
}
cmds := removeCommandFromList(cmdIdx, oldCmds, a)
// Create the new capture
old, err := capture.ResolveGraphicsFromPath(ctx, p.Capture)
if err != nil {
return nil, err
}
c, err := capture.NewGraphicsCapture(ctx, a, old.Name()+"*", old.Header, old.InitialState, cmds)
if err != nil {
return nil, err
}
newCapure, err := capture.New(ctx, c)
if err != nil {
return nil, err
}
return newCapure, nil
}
return nil, fmt.Errorf("Incorrect path type %T", p)
}
func removeCommandFromList(cmdIdx uint64, oldCmds []api.Cmd, a arena.Arena) []api.Cmd {
const MAXID = math.MaxUint64
firstChildToRemove := cmdIdx
// All the children(and grandchildren) of the command are consequent to each other
for i := int(cmdIdx - 1); i > 0; i-- {
callerID := oldCmds[i].Caller()
if callerID == api.CmdNoID || uint64(callerID) > cmdIdx {
break
}
firstChildToRemove = uint64(i)
}
parentShift := cmdIdx - firstChildToRemove + 1
newCommandListLength := uint64(len(oldCmds)) - parentShift
cmds := make([]api.Cmd, 0, newCommandListLength)
cmds = append(cmds, oldCmds[:firstChildToRemove]...)
// Update the parents of any siblings of the command to remove
for i := int(firstChildToRemove - 1); i > 0; i-- {
callerID := cmds[i].Caller()
if callerID == api.CmdNoID {
break
}
if uint64(callerID) > cmdIdx {
cmds[i] = cmds[i].Clone(a)
cmds[i].SetCaller(api.CmdID(uint64(callerID) - parentShift))
}
}
cmds = append(cmds, oldCmds[cmdIdx+1:]...)
// Update the any parent id for the rest of the trace
for i := firstChildToRemove; i < newCommandListLength; i++ {
callerID := cmds[i].Caller()
if callerID == api.CmdNoID {
continue
}
cmds[i] = cmds[i].Clone(a)
cmds[i].SetCaller(api.CmdID(uint64(callerID) - parentShift))
}
return cmds
}