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/*
* Copyright 2016 WebAssembly Community Group participants
*
* 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 wasm_builder_h
#define wasm_builder_h
#include <wasm.h>
namespace wasm {
// Useful data structures
struct NameType {
Name name;
WasmType type;
NameType() : name(nullptr), type(none) {}
NameType(Name name, WasmType type) : name(name), type(type) {}
};
// General AST node builder
class Builder {
MixedArena &allocator;
public:
Builder(Module& wasm) : allocator(wasm.allocator) {}
// make* functions, create nodes
Function* makeFunction(Name name,
std::vector<NameType>&& params,
WasmType resultType,
std::vector<NameType>&& vars,
Expression* body = nullptr) {
auto* func = allocator.alloc<Function>();
func->name = name;
func->result = resultType;
func->body = body;
for (auto& param : params) {
func->params.push_back(param.type);
func->localIndices[param.name] = func->localNames.size();
func->localNames.push_back(param.name);
}
for (auto& var : vars) {
func->vars.push_back(var.type);
func->localIndices[var.name] = func->localNames.size();
func->localNames.push_back(var.name);
}
return func;
}
// Nop TODO: add all the rest
// Block
If* makeIf(Expression* condition, Expression* ifTrue, Expression* ifFalse=nullptr) {
auto* ret = allocator.alloc<If>();
ret->condition = condition; ret->ifTrue = ifTrue; ret->ifFalse = ifFalse;
ret->finalize();
return ret;
}
// Loop
// Break
// Switch
// CallBase
// Call
// CallImport
// Also do a version which takes a sig?
CallIndirect* makeCallIndirect(FunctionType* type, Expression* target, std::vector<Expression*>&& args) {
auto* call = allocator.alloc<CallIndirect>();
call->fullType = type;
call->type = type->result;
call->target = target;
call->operands = args;
return call;
}
// FunctionType
GetLocal* makeGetLocal(Index index, WasmType type) {
auto* ret = allocator.alloc<GetLocal>();
ret->index = index;
ret->type = type;
return ret;
}
SetLocal* makeSetLocal(Index index, Expression* value) {
auto* ret = allocator.alloc<SetLocal>();
ret->index = index;
ret->value = value;
ret->type = value->type;
return ret;
}
// Load
Store* makeStore(unsigned bytes, uint32_t offset, unsigned align, Expression *ptr, Expression *value) {
auto* ret = allocator.alloc<Store>();
ret->bytes = bytes; ret->offset = offset; ret->align = align; ret->ptr = ptr; ret->value = value;
ret->type = value->type;
return ret;
}
Const* makeConst(Literal value) {
auto* ret = allocator.alloc<Const>();
ret->value = value;
ret->type = value.type;
return ret;
}
Unary* makeUnary(UnaryOp op, Expression *value, WasmType type=none) {
auto* ret = allocator.alloc<Unary>();
ret->op = op; ret->value = value;
if (type != none) {
ret->type = type; // some opcodes have more than one type, user must provide it
} else {
switch (op) {
case Clz:
case Ctz:
case Popcnt:
case Neg:
case Abs:
case Ceil:
case Floor:
case Trunc:
case Nearest:
case Sqrt: ret->type = value->type; break;
case EqZ: ret->type = i32; break;
case ExtendSInt32: case ExtendUInt32: ret->type = i64; break;
case WrapInt64: ret->type = i32; break;
case PromoteFloat32: ret->type = f64; break;
case DemoteFloat64: ret->type = f32; break;
case TruncSFloat32: case TruncUFloat32: case TruncSFloat64: case TruncUFloat64: case ReinterpretFloat:
case ConvertSInt32: case ConvertUInt32: case ConvertSInt64: case ConvertUInt64: case ReinterpretInt: abort(); // user needs to say the type
default: abort();
}
}
return ret;
}
Binary* makeBinary(BinaryOp op, Expression *left, Expression *right) {
auto* ret = allocator.alloc<Binary>();
ret->op = op; ret->left = left; ret->right = right;
ret->finalize();
return ret;
}
// Select
Return* makeReturn(Expression *value) {
auto* ret = allocator.alloc<Return>();
ret->value = value;
return ret;
}
Host* makeHost(HostOp op, Name nameOperand, ExpressionList&& operands) {
auto* ret = allocator.alloc<Host>();
ret->op = op;
ret->nameOperand = nameOperand;
ret->operands = operands;
return ret;
}
// Unreachable
// Additional utility functions for building on top of nodes
static Index addParam(Function* func, Name name, WasmType type) {
// only ok to add a param if no vars, otherwise indices are invalidated
assert(func->localIndices.size() == func->params.size());
func->params.push_back(type);
Index index = func->localNames.size();
func->localIndices[name] = index;
func->localNames.push_back(name);
return index;
}
static Index addVar(Function* func, Name name, WasmType type) {
// always ok to add a var, it does not affect other indices
assert(func->localIndices.size() == func->params.size() + func->vars.size());
func->vars.emplace_back(type);
Index index = func->localNames.size();
func->localIndices[name] = index;
func->localNames.push_back(name);
return index;
}
static void clearLocals(Function* func) {
func->params.clear();
func->vars.clear();
func->localNames.clear();
func->localIndices.clear();
}
};
} // namespace wasm
#endif // wasm_builder_h
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