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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.
*/
#include "generate-names.h"
#include <cassert>
#include <cstdio>
#include <string>
#include <vector>
#include "expr-visitor.h"
#include "ir.h"
#define CHECK_RESULT(expr) \
do { \
if (WABT_FAILED(expr)) \
return Result::Error; \
} while (0)
namespace wabt {
namespace {
class NameGenerator : public ExprVisitor::DelegateNop {
public:
NameGenerator();
Result VisitModule(Module* module);
// Implementation of ExprVisitor::DelegateNop.
Result BeginBlockExpr(Expr* expr) override;
Result BeginLoopExpr(Expr* expr) override;
Result BeginIfExpr(Expr* expr) override;
private:
static bool HasName(StringSlice* str);
static void GenerateName(const char* prefix, Index index, StringSlice* str);
static void MaybeGenerateName(const char* prefix,
Index index,
StringSlice* str);
static void GenerateAndBindName(BindingHash* bindings,
const char* prefix,
Index index,
StringSlice* str);
static void MaybeGenerateAndBindName(BindingHash* bindings,
const char* prefix,
Index index,
StringSlice* str);
void GenerateAndBindLocalNames(BindingHash* bindings, const char* prefix);
Result VisitFunc(Index func_index, Func* func);
Result VisitGlobal(Index global_index, Global* global);
Result VisitFuncType(Index func_type_index, FuncType* func_type);
Result VisitTable(Index table_index, Table* table);
Result VisitMemory(Index memory_index, Memory* memory);
Module* module_ = nullptr;
ExprVisitor visitor_;
std::vector<std::string> index_to_name_;
Index label_count_ = 0;
};
NameGenerator::NameGenerator() : visitor_(this) {}
// static
bool NameGenerator::HasName(StringSlice* str) {
return str->length > 0;
}
// static
void NameGenerator::GenerateName(const char* prefix,
Index index,
StringSlice* str) {
size_t prefix_len = strlen(prefix);
size_t buffer_len = prefix_len + 20; /* add space for the number */
char* buffer = static_cast<char*>(alloca(buffer_len));
int actual_len = wabt_snprintf(buffer, buffer_len, "%s%u", prefix, index);
StringSlice buf;
buf.length = actual_len;
buf.start = buffer;
*str = dup_string_slice(buf);
}
// static
void NameGenerator::MaybeGenerateName(const char* prefix,
Index index,
StringSlice* str) {
if (!HasName(str))
GenerateName(prefix, index, str);
}
// static
void NameGenerator::GenerateAndBindName(BindingHash* bindings,
const char* prefix,
Index index,
StringSlice* str) {
GenerateName(prefix, index, str);
bindings->emplace(string_slice_to_string(*str), Binding(index));
}
// static
void NameGenerator::MaybeGenerateAndBindName(BindingHash* bindings,
const char* prefix,
Index index,
StringSlice* str) {
if (!HasName(str))
GenerateAndBindName(bindings, prefix, index, str);
}
void NameGenerator::GenerateAndBindLocalNames(BindingHash* bindings,
const char* prefix) {
for (size_t i = 0; i < index_to_name_.size(); ++i) {
const std::string& old_name = index_to_name_[i];
if (!old_name.empty())
continue;
StringSlice new_name;
GenerateAndBindName(bindings, prefix, i, &new_name);
index_to_name_[i] = string_slice_to_string(new_name);
destroy_string_slice(&new_name);
}
}
Result NameGenerator::BeginBlockExpr(Expr* expr) {
MaybeGenerateName("$B", label_count_++, &expr->block->label);
return Result::Ok;
}
Result NameGenerator::BeginLoopExpr(Expr* expr) {
MaybeGenerateName("$L", label_count_++, &expr->loop->label);
return Result::Ok;
}
Result NameGenerator::BeginIfExpr(Expr* expr) {
MaybeGenerateName("$I", label_count_++, &expr->if_.true_->label);
return Result::Ok;
}
Result NameGenerator::VisitFunc(Index func_index, Func* func) {
MaybeGenerateAndBindName(&module_->func_bindings, "$f", func_index,
&func->name);
MakeTypeBindingReverseMapping(func->decl.sig.param_types,
func->param_bindings, &index_to_name_);
GenerateAndBindLocalNames(&func->param_bindings, "$p");
MakeTypeBindingReverseMapping(func->local_types, func->local_bindings,
&index_to_name_);
GenerateAndBindLocalNames(&func->local_bindings, "$l");
label_count_ = 0;
CHECK_RESULT(visitor_.VisitFunc(func));
return Result::Ok;
}
Result NameGenerator::VisitGlobal(Index global_index, Global* global) {
MaybeGenerateAndBindName(&module_->global_bindings, "$g", global_index,
&global->name);
return Result::Ok;
}
Result NameGenerator::VisitFuncType(Index func_type_index,
FuncType* func_type) {
MaybeGenerateAndBindName(&module_->func_type_bindings, "$t", func_type_index,
&func_type->name);
return Result::Ok;
}
Result NameGenerator::VisitTable(Index table_index, Table* table) {
MaybeGenerateAndBindName(&module_->table_bindings, "$T", table_index,
&table->name);
return Result::Ok;
}
Result NameGenerator::VisitMemory(Index memory_index, Memory* memory) {
MaybeGenerateAndBindName(&module_->memory_bindings, "$M", memory_index,
&memory->name);
return Result::Ok;
}
Result NameGenerator::VisitModule(Module* module) {
module_ = module;
for (Index i = 0; i < module->globals.size(); ++i)
CHECK_RESULT(VisitGlobal(i, module->globals[i]));
for (Index i = 0; i < module->func_types.size(); ++i)
CHECK_RESULT(VisitFuncType(i, module->func_types[i]));
for (Index i = 0; i < module->funcs.size(); ++i)
CHECK_RESULT(VisitFunc(i, module->funcs[i]));
for (Index i = 0; i < module->tables.size(); ++i)
CHECK_RESULT(VisitTable(i, module->tables[i]));
for (Index i = 0; i < module->memories.size(); ++i)
CHECK_RESULT(VisitMemory(i, module->memories[i]));
module_ = nullptr;
return Result::Ok;
}
} // namespace
Result generate_names(Module* module) {
NameGenerator generator;
return generator.VisitModule(module);
}
} // namespace wabt
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