4479ac15c9
This patch makes adjustments to header file includes in lldbUtility based on recommendations by the iwyu tool (include-what-you-use). The goal here is to make sure that all files include the exact set of headers which are needed for that file only, to eliminate cases of dead includes (e.g. someone deleted some code but forgot to delete the header includes that that code necessitated), and to eliminate the case where header includes are picked up transitively. llvm-svn: 299676
553 lines
14 KiB
C++
553 lines
14 KiB
C++
//===--------------------- JSON.cpp -----------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/JSON.h"
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#include "lldb/Utility/Stream.h" // for Stream
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#include "lldb/Utility/StreamString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <inttypes.h> // for PRIu64, PRId64
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#include <limits.h>
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#include <stddef.h> // for size_t
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#include <utility> // for pair
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using namespace lldb_private;
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std::string JSONString::json_string_quote_metachars(const std::string &s) {
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if (s.find('"') == std::string::npos)
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return s;
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std::string output;
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const size_t s_size = s.size();
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const char *s_chars = s.c_str();
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for (size_t i = 0; i < s_size; i++) {
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unsigned char ch = *(s_chars + i);
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if (ch == '"') {
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output.push_back('\\');
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}
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output.push_back(ch);
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}
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return output;
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}
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JSONString::JSONString() : JSONValue(JSONValue::Kind::String), m_data() {}
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JSONString::JSONString(const char *s)
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: JSONValue(JSONValue::Kind::String), m_data(s ? s : "") {}
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JSONString::JSONString(const std::string &s)
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: JSONValue(JSONValue::Kind::String), m_data(s) {}
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void JSONString::Write(Stream &s) {
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s.Printf("\"%s\"", json_string_quote_metachars(m_data).c_str());
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}
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uint64_t JSONNumber::GetAsUnsigned() const {
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switch (m_data_type) {
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case DataType::Unsigned:
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return m_data.m_unsigned;
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case DataType::Signed:
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return (uint64_t)m_data.m_signed;
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case DataType::Double:
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return (uint64_t)m_data.m_double;
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}
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llvm_unreachable("Unhandled data type");
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}
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int64_t JSONNumber::GetAsSigned() const {
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switch (m_data_type) {
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case DataType::Unsigned:
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return (int64_t)m_data.m_unsigned;
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case DataType::Signed:
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return m_data.m_signed;
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case DataType::Double:
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return (int64_t)m_data.m_double;
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}
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llvm_unreachable("Unhandled data type");
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}
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double JSONNumber::GetAsDouble() const {
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switch (m_data_type) {
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case DataType::Unsigned:
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return (double)m_data.m_unsigned;
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case DataType::Signed:
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return (double)m_data.m_signed;
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case DataType::Double:
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return m_data.m_double;
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}
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llvm_unreachable("Unhandled data type");
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}
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void JSONNumber::Write(Stream &s) {
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switch (m_data_type) {
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case DataType::Unsigned:
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s.Printf("%" PRIu64, m_data.m_unsigned);
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break;
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case DataType::Signed:
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s.Printf("%" PRId64, m_data.m_signed);
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break;
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case DataType::Double:
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s.Printf("%g", m_data.m_double);
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break;
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}
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}
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JSONTrue::JSONTrue() : JSONValue(JSONValue::Kind::True) {}
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void JSONTrue::Write(Stream &s) { s.Printf("true"); }
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JSONFalse::JSONFalse() : JSONValue(JSONValue::Kind::False) {}
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void JSONFalse::Write(Stream &s) { s.Printf("false"); }
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JSONNull::JSONNull() : JSONValue(JSONValue::Kind::Null) {}
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void JSONNull::Write(Stream &s) { s.Printf("null"); }
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JSONObject::JSONObject() : JSONValue(JSONValue::Kind::Object) {}
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void JSONObject::Write(Stream &s) {
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bool first = true;
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s.PutChar('{');
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auto iter = m_elements.begin(), end = m_elements.end();
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for (; iter != end; iter++) {
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if (first)
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first = false;
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else
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s.PutChar(',');
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JSONString key(iter->first);
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JSONValue::SP value(iter->second);
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key.Write(s);
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s.PutChar(':');
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value->Write(s);
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}
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s.PutChar('}');
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}
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bool JSONObject::SetObject(const std::string &key, JSONValue::SP value) {
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if (key.empty() || nullptr == value.get())
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return false;
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m_elements[key] = value;
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return true;
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}
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JSONValue::SP JSONObject::GetObject(const std::string &key) {
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auto iter = m_elements.find(key), end = m_elements.end();
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if (iter == end)
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return JSONValue::SP();
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return iter->second;
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}
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JSONArray::JSONArray() : JSONValue(JSONValue::Kind::Array) {}
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void JSONArray::Write(Stream &s) {
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bool first = true;
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s.PutChar('[');
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auto iter = m_elements.begin(), end = m_elements.end();
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for (; iter != end; iter++) {
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if (first)
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first = false;
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else
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s.PutChar(',');
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(*iter)->Write(s);
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}
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s.PutChar(']');
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}
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bool JSONArray::SetObject(Index i, JSONValue::SP value) {
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if (value.get() == nullptr)
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return false;
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if (i < m_elements.size()) {
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m_elements[i] = value;
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return true;
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}
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if (i == m_elements.size()) {
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m_elements.push_back(value);
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return true;
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}
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return false;
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}
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bool JSONArray::AppendObject(JSONValue::SP value) {
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if (value.get() == nullptr)
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return false;
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m_elements.push_back(value);
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return true;
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}
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JSONValue::SP JSONArray::GetObject(Index i) {
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if (i < m_elements.size())
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return m_elements[i];
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return JSONValue::SP();
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}
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JSONArray::Size JSONArray::GetNumElements() { return m_elements.size(); }
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JSONParser::JSONParser(const char *cstr) : StringExtractor(cstr) {}
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JSONParser::Token JSONParser::GetToken(std::string &value) {
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StreamString error;
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value.clear();
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SkipSpaces();
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const uint64_t start_index = m_index;
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const char ch = GetChar();
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switch (ch) {
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case '{':
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return Token::ObjectStart;
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case '}':
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return Token::ObjectEnd;
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case '[':
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return Token::ArrayStart;
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case ']':
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return Token::ArrayEnd;
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case ',':
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return Token::Comma;
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case ':':
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return Token::Colon;
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case '\0':
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return Token::EndOfFile;
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case 't':
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if (GetChar() == 'r')
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if (GetChar() == 'u')
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if (GetChar() == 'e')
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return Token::True;
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break;
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case 'f':
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if (GetChar() == 'a')
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if (GetChar() == 'l')
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if (GetChar() == 's')
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if (GetChar() == 'e')
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return Token::False;
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break;
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case 'n':
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if (GetChar() == 'u')
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if (GetChar() == 'l')
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if (GetChar() == 'l')
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return Token::Null;
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break;
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case '"': {
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while (1) {
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bool was_escaped = false;
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int escaped_ch = GetEscapedChar(was_escaped);
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if (escaped_ch == -1) {
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error.Printf(
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"error: an error occurred getting a character from offset %" PRIu64,
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start_index);
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value = std::move(error.GetString());
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return Token::Error;
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} else {
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const bool is_end_quote = escaped_ch == '"';
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const bool is_null = escaped_ch == 0;
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if (was_escaped || (!is_end_quote && !is_null)) {
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if (CHAR_MIN <= escaped_ch && escaped_ch <= CHAR_MAX) {
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value.append(1, (char)escaped_ch);
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} else {
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error.Printf("error: wide character support is needed for unicode "
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"character 0x%4.4x at offset %" PRIu64,
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escaped_ch, start_index);
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value = std::move(error.GetString());
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return Token::Error;
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}
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} else if (is_end_quote) {
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return Token::String;
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} else if (is_null) {
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value = "error: missing end quote for string";
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return Token::Error;
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}
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}
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}
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} break;
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case '-':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9': {
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bool done = false;
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bool got_decimal_point = false;
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uint64_t exp_index = 0;
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bool got_int_digits = (ch >= '0') && (ch <= '9');
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bool got_frac_digits = false;
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bool got_exp_digits = false;
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while (!done) {
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const char next_ch = PeekChar();
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switch (next_ch) {
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if (exp_index != 0) {
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got_exp_digits = true;
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} else if (got_decimal_point) {
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got_frac_digits = true;
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} else {
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got_int_digits = true;
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}
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++m_index; // Skip this character
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break;
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case '.':
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if (got_decimal_point) {
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error.Printf("error: extra decimal point found at offset %" PRIu64,
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start_index);
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value = std::move(error.GetString());
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return Token::Error;
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} else {
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got_decimal_point = true;
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++m_index; // Skip this character
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}
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break;
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case 'e':
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case 'E':
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if (exp_index != 0) {
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error.Printf(
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"error: extra exponent character found at offset %" PRIu64,
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start_index);
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value = std::move(error.GetString());
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return Token::Error;
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} else {
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exp_index = m_index;
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++m_index; // Skip this character
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}
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break;
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case '+':
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case '-':
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// The '+' and '-' can only come after an exponent character...
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if (exp_index == m_index - 1) {
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++m_index; // Skip the exponent sign character
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} else {
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error.Printf("error: unexpected %c character at offset %" PRIu64,
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next_ch, start_index);
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value = std::move(error.GetString());
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return Token::Error;
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}
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break;
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default:
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done = true;
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break;
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}
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}
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if (m_index > start_index) {
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value = m_packet.substr(start_index, m_index - start_index);
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if (got_decimal_point) {
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if (exp_index != 0) {
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// We have an exponent, make sure we got exponent digits
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if (got_exp_digits) {
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return Token::Float;
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} else {
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error.Printf("error: got exponent character but no exponent digits "
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"at offset in float value \"%s\"",
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value.c_str());
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value = std::move(error.GetString());
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return Token::Error;
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}
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} else {
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// No exponent, but we need at least one decimal after the decimal
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// point
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if (got_frac_digits) {
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return Token::Float;
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} else {
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error.Printf("error: no digits after decimal point \"%s\"",
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value.c_str());
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value = std::move(error.GetString());
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return Token::Error;
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}
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}
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} else {
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// No decimal point
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if (got_int_digits) {
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// We need at least some integer digits to make an integer
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return Token::Integer;
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} else {
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error.Printf("error: no digits negate sign \"%s\"", value.c_str());
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value = std::move(error.GetString());
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return Token::Error;
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}
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}
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} else {
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error.Printf("error: invalid number found at offset %" PRIu64,
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start_index);
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value = std::move(error.GetString());
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return Token::Error;
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}
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} break;
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default:
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break;
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}
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error.Printf("error: failed to parse token at offset %" PRIu64
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" (around character '%c')",
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start_index, ch);
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value = std::move(error.GetString());
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return Token::Error;
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}
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int JSONParser::GetEscapedChar(bool &was_escaped) {
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was_escaped = false;
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const char ch = GetChar();
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if (ch == '\\') {
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was_escaped = true;
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const char ch2 = GetChar();
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switch (ch2) {
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case '"':
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case '\\':
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case '/':
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default:
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break;
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case 'b':
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return '\b';
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case 'f':
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return '\f';
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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case 'u': {
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const int hi_byte = DecodeHexU8();
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const int lo_byte = DecodeHexU8();
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if (hi_byte >= 0 && lo_byte >= 0)
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return hi_byte << 8 | lo_byte;
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return -1;
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} break;
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}
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return ch2;
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}
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return ch;
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}
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JSONValue::SP JSONParser::ParseJSONObject() {
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// The "JSONParser::Token::ObjectStart" token should have already been
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// consumed
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// by the time this function is called
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std::unique_ptr<JSONObject> dict_up(new JSONObject());
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std::string value;
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std::string key;
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while (1) {
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JSONParser::Token token = GetToken(value);
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if (token == JSONParser::Token::String) {
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key.swap(value);
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token = GetToken(value);
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if (token == JSONParser::Token::Colon) {
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JSONValue::SP value_sp = ParseJSONValue();
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if (value_sp)
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dict_up->SetObject(key, value_sp);
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else
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break;
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}
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} else if (token == JSONParser::Token::ObjectEnd) {
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return JSONValue::SP(dict_up.release());
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} else if (token == JSONParser::Token::Comma) {
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continue;
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} else {
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break;
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}
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}
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return JSONValue::SP();
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}
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JSONValue::SP JSONParser::ParseJSONArray() {
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// The "JSONParser::Token::ObjectStart" token should have already been
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// consumed
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// by the time this function is called
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std::unique_ptr<JSONArray> array_up(new JSONArray());
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std::string value;
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std::string key;
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while (1) {
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JSONValue::SP value_sp = ParseJSONValue();
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if (value_sp)
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array_up->AppendObject(value_sp);
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else
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break;
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JSONParser::Token token = GetToken(value);
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if (token == JSONParser::Token::Comma) {
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continue;
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} else if (token == JSONParser::Token::ArrayEnd) {
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return JSONValue::SP(array_up.release());
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} else {
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break;
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}
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}
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return JSONValue::SP();
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}
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JSONValue::SP JSONParser::ParseJSONValue() {
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std::string value;
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const JSONParser::Token token = GetToken(value);
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switch (token) {
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case JSONParser::Token::ObjectStart:
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return ParseJSONObject();
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case JSONParser::Token::ArrayStart:
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return ParseJSONArray();
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case JSONParser::Token::Integer: {
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if (value.front() == '-') {
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int64_t sval = 0;
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if (!llvm::StringRef(value).getAsInteger(0, sval))
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return JSONValue::SP(new JSONNumber(sval));
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} else {
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uint64_t uval = 0;
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if (!llvm::StringRef(value).getAsInteger(0, uval))
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return JSONValue::SP(new JSONNumber(uval));
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}
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} break;
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case JSONParser::Token::Float: {
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double D;
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if (!llvm::StringRef(value).getAsDouble(D))
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return JSONValue::SP(new JSONNumber(D));
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} break;
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case JSONParser::Token::String:
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return JSONValue::SP(new JSONString(value));
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case JSONParser::Token::True:
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return JSONValue::SP(new JSONTrue());
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case JSONParser::Token::False:
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return JSONValue::SP(new JSONFalse());
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case JSONParser::Token::Null:
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return JSONValue::SP(new JSONNull());
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default:
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break;
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}
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return JSONValue::SP();
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}
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