| // Copyright (C) 2014 The Android Open Source Project |
| // |
| // 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 semantic |
| |
| import "android.googlesource.com/platform/tools/gpu/api/ast" |
| |
| // Block represents a collection of statements, used as the body of other |
| // nodes. |
| type Block struct { |
| AST *ast.Block // the underlying syntax node this was built from |
| Statements []Node // the set of statements this block represents |
| } |
| |
| // Branch represents the basic conditional execution statement. |
| // If Condition is true we use the True block, otherwise the False block. |
| type Branch struct { |
| AST *ast.Branch // the underlying syntax node this was built from |
| Condition Expression // the condition to select on |
| True *Block // use if Condition is true |
| False *Block // used if Condition is false |
| } |
| |
| // Switch represents a resolved ast.Switch statement. |
| type Switch struct { |
| AST *ast.Switch // the underlying syntax node this was built from |
| Value Expression // the value to match the cases against |
| Cases []*Case // the set of case statements to choose from |
| } |
| |
| // Case represents a possible choice in a switch. |
| type Case struct { |
| AST *ast.Case // the underlying syntax node this was built from |
| Conditions []Expression // the set of expressions to match the switch value against |
| Block *Block // the block to use if a condition matches |
| } |
| |
| // Iteration is the basic looping construct. |
| // It will set Iterator to each value from Iterable in turn, and run Block for each one. |
| type Iteration struct { |
| AST *ast.Iteration // the underlying syntax node this was built from |
| Iterator *Local // the iteration control variable |
| Iterable Expression // the expression to iterate over |
| Block *Block // the block to run for each entry from Iterable |
| } |
| |
| // Assign is the only "mutating" construct. |
| // It assigns the value from the rhs into the slot described by the lhs, as defined |
| // by the operator. |
| type Assign struct { |
| AST *ast.Assign // the underlying syntax node this was built from |
| LHS Expression // the expression that gives the location to store into |
| Operator string // the assignment operator being applied |
| RHS Expression // the value to store |
| } |
| |
| // MapAssign represents assigning to a map index expression. |
| type MapAssign struct { |
| AST *ast.Assign // the underlying syntax node this was built from |
| To *MapIndex // the map index to assign to |
| Operator string // the assignment operator being applied |
| Value Expression // the value to set in the map |
| } |
| |
| // SliceAssign represents assigning to a slice index expression. |
| type SliceAssign struct { |
| AST *ast.Assign // the underlying syntax node this was built from |
| To *SliceIndex // the slice index to assign to |
| Operator string // the assignment operator being applied |
| Value Expression // the value to set in the slice |
| } |
| |
| // DeclareLocal represents a local variable declaration statement. |
| // Variables cannot be modified after declaration. |
| type DeclareLocal struct { |
| AST *ast.DeclareLocal // the underlying syntax node this was built from |
| Local *Local // the local variable that was declared by this statement |
| } |
| |
| // Return represents return statement for a function or macro. |
| type Return struct { |
| AST *ast.Return // the underlying syntax node this was built from |
| Function *Function // the function this statement returns from |
| Value Expression // the value to be returned |
| } |
| |
| // Fence is a marker to indicate a safe point between the last read and the first write. |
| // It can be used to generate safe forwarding calls. |
| type Fence struct{} |