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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 <assert.h>
#include <stdio.h>
#include <string>
#include <vector>
#include "ir.h"
#define CHECK_RESULT(expr) \
do { \
if (WABT_FAILED(expr)) \
return Result::Error; \
} while (0)
namespace wabt {
namespace {
struct Context {
Context() : module(nullptr), label_count(0) { WABT_ZERO_MEMORY(visitor); }
Module* module;
ExprVisitor visitor;
std::vector<std::string> index_to_name;
uint32_t label_count;
};
} // namespace
static bool has_name(StringSlice* str) {
return str->length > 0;
}
static void generate_name(const char* prefix,
uint32_t 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 maybe_generate_name(const char* prefix,
uint32_t index,
StringSlice* str) {
if (!has_name(str))
generate_name(prefix, index, str);
}
static void generate_and_bind_name(BindingHash* bindings,
const char* prefix,
uint32_t index,
StringSlice* str) {
generate_name(prefix, index, str);
bindings->emplace(string_slice_to_string(*str), Binding(index));
}
static void maybe_generate_and_bind_name(BindingHash* bindings,
const char* prefix,
uint32_t index,
StringSlice* str) {
if (!has_name(str))
generate_and_bind_name(bindings, prefix, index, str);
}
static void generate_and_bind_local_names(
Context* ctx,
BindingHash* bindings,
const char* prefix) {
for (size_t i = 0; i < ctx->index_to_name.size(); ++i) {
const std::string& old_name = ctx->index_to_name[i];
if (!old_name.empty())
continue;
StringSlice new_name;
generate_and_bind_name(bindings, prefix, i, &new_name);
ctx->index_to_name[i] = string_slice_to_string(new_name);
destroy_string_slice(&new_name);
}
}
static Result begin_block_expr(Expr* expr, void* user_data) {
Context* ctx = static_cast<Context*>(user_data);
maybe_generate_name("$B", ctx->label_count++, &expr->block->label);
return Result::Ok;
}
static Result begin_loop_expr(Expr* expr, void* user_data) {
Context* ctx = static_cast<Context*>(user_data);
maybe_generate_name("$L", ctx->label_count++, &expr->loop->label);
return Result::Ok;
}
static Result begin_if_expr(Expr* expr, void* user_data) {
Context* ctx = static_cast<Context*>(user_data);
maybe_generate_name("$L", ctx->label_count++, &expr->if_.true_->label);
return Result::Ok;
}
static Result visit_func(Context* ctx, uint32_t func_index, Func* func) {
maybe_generate_and_bind_name(&ctx->module->func_bindings, "$f", func_index,
&func->name);
make_type_binding_reverse_mapping(func->decl.sig.param_types,
func->param_bindings, &ctx->index_to_name);
generate_and_bind_local_names(ctx, &func->param_bindings, "$p");
make_type_binding_reverse_mapping(func->local_types, func->local_bindings,
&ctx->index_to_name);
generate_and_bind_local_names(ctx, &func->local_bindings, "$l");
ctx->label_count = 0;
CHECK_RESULT(visit_func(func, &ctx->visitor));
return Result::Ok;
}
static Result visit_global(Context* ctx,
uint32_t global_index,
Global* global) {
maybe_generate_and_bind_name(&ctx->module->global_bindings, "$g",
global_index, &global->name);
return Result::Ok;
}
static Result visit_func_type(Context* ctx,
uint32_t func_type_index,
FuncType* func_type) {
maybe_generate_and_bind_name(&ctx->module->func_type_bindings, "$t",
func_type_index, &func_type->name);
return Result::Ok;
}
static Result visit_table(Context* ctx, uint32_t table_index, Table* table) {
maybe_generate_and_bind_name(&ctx->module->table_bindings, "$T", table_index,
&table->name);
return Result::Ok;
}
static Result visit_memory(Context* ctx,
uint32_t memory_index,
Memory* memory) {
maybe_generate_and_bind_name(&ctx->module->memory_bindings, "$M",
memory_index, &memory->name);
return Result::Ok;
}
static Result visit_module(Context* ctx, Module* module) {
for (size_t i = 0; i < module->globals.size(); ++i)
CHECK_RESULT(visit_global(ctx, i, module->globals[i]));
for (size_t i = 0; i < module->func_types.size(); ++i)
CHECK_RESULT(visit_func_type(ctx, i, module->func_types[i]));
for (size_t i = 0; i < module->funcs.size(); ++i)
CHECK_RESULT(visit_func(ctx, i, module->funcs[i]));
for (size_t i = 0; i < module->tables.size(); ++i)
CHECK_RESULT(visit_table(ctx, i, module->tables[i]));
for (size_t i = 0; i < module->memories.size(); ++i)
CHECK_RESULT(visit_memory(ctx, i, module->memories[i]));
return Result::Ok;
}
Result generate_names(Module* module) {
Context ctx;
ctx.visitor.user_data = &ctx;
ctx.visitor.begin_block_expr = begin_block_expr;
ctx.visitor.begin_loop_expr = begin_loop_expr;
ctx.visitor.begin_if_expr = begin_if_expr;
ctx.module = module;
Result result = visit_module(&ctx, module);
return result;
}
} // namespace wabt
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