third_party/wasm2c/src/tracing.cc

   1 /*
   2  * Copyright 2017 WebAssembly Community Group participants
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #define WABT_TRACING 1
  18 #include "wabt/tracing.h"
  19
  20 namespace {
  21
  22 size_t indent = 0;
  23 const char* indent_text = "  ";
  24
  25 void Fill() {
  26   for (size_t i = 0; i < indent; ++i)
  27     fputs(indent_text, stderr);
  28 }
  29
  30 void Indent() {
  31   Fill();
  32   ++indent;
  33 }
  34
  35 void Dedent() {
  36   if (indent) {
  37     --indent;
  38   }
  39   Fill();
  40 }
  41
  42 }  // end of anonymous namespace
  43
  44 namespace wabt {
  45
  46 // static
  47
  48 TraceScope::TraceScope(const char* method) : method_(method) {
  49   PrintEnter(method);
  50   PrintNewline();
  51 }
  52
  53 TraceScope::~TraceScope() {
  54   Dedent();
  55   fputs("<- ", stderr);
  56   fputs(method_, stderr);
  57   fputc('\n', stderr);
  58 }
  59
  60 void TraceScope::PrintEnter(const char* method) {
  61   Indent();
  62   fputs("-> ", stderr);
  63   fputs(method, stderr);
  64   fputs("(", stderr);
  65 }
  66
  67 void TraceScope::PrintNewline() {
  68   fputs(")\n", stderr);
  69 }
  70
  71 }  // end of namespace wabt