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// Copyright 2020 The Tint Authors.
//
// 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.
#ifndef SRC_TINT_WRITER_SPIRV_FUNCTION_H_
#define SRC_TINT_WRITER_SPIRV_FUNCTION_H_
#include <functional>
#include "src/tint/writer/spirv/instruction.h"
namespace tint::writer::spirv {
/// A SPIR-V function
class Function {
public:
/// Constructor for testing purposes
/// This creates a bad declaration, so won't generate correct SPIR-V
Function();
/// Constructor
/// @param declaration the function declaration
/// @param label_op the operand for function's entry block label
/// @param params the function parameters
Function(const Instruction& declaration,
const Operand& label_op,
const InstructionList& params);
/// Copy constructor
/// @param other the function to copy
Function(const Function& other);
~Function();
/// Iterates over the function call the cb on each instruction
/// @param cb the callback to call
void iterate(std::function<void(const Instruction&)> cb) const;
/// @returns the declaration
const Instruction& declaration() const { return declaration_; }
/// @returns the label ID for the function entry block
uint32_t label_id() const { return std::get<uint32_t>(label_op_); }
/// Adds an instruction to the instruction list
/// @param op the op to set
/// @param operands the operands for the instruction
void push_inst(spv::Op op, const OperandList& operands) {
instructions_.push_back(Instruction{op, operands});
}
/// @returns the instruction list
const InstructionList& instructions() const { return instructions_; }
/// Adds a variable to the variable list
/// @param operands the operands for the variable
void push_var(const OperandList& operands) {
vars_.push_back(Instruction{spv::Op::OpVariable, operands});
}
/// @returns the variable list
const InstructionList& variables() const { return vars_; }
/// @returns the word length of the function
uint32_t word_length() const {
// 1 for the Label and 1 for the FunctionEnd
uint32_t size = 2 + declaration_.word_length();
for (const auto& param : params_) {
size += param.word_length();
}
for (const auto& var : vars_) {
size += var.word_length();
}
for (const auto& inst : instructions_) {
size += inst.word_length();
}
return size;
}
private:
Instruction declaration_;
Operand label_op_;
InstructionList params_;
InstructionList vars_;
InstructionList instructions_;
};
} // namespace tint::writer::spirv
#endif // SRC_TINT_WRITER_SPIRV_FUNCTION_H_