import from github
This commit is contained in:
599
tools/preproc/asm_file.cpp
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599
tools/preproc/asm_file.cpp
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@ -0,0 +1,599 @@
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// Copyright(c) 2016 YamaArashi
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include <cstdio>
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#include <cstdarg>
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#include <stdexcept>
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#include "preproc.h"
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#include "asm_file.h"
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#include "char_util.h"
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#include "utf8.h"
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#include "string_parser.h"
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#include "../../gflib/characters.h"
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AsmFile::AsmFile(std::string filename) : m_filename(filename)
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{
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FILE *fp = std::fopen(filename.c_str(), "rb");
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if (fp == NULL)
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FATAL_ERROR("Failed to open \"%s\" for reading.\n", filename.c_str());
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std::fseek(fp, 0, SEEK_END);
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m_size = std::ftell(fp);
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if (m_size < 0)
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FATAL_ERROR("File size of \"%s\" is less than zero.\n", filename.c_str());
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m_buffer = new char[m_size + 1];
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std::rewind(fp);
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if (std::fread(m_buffer, m_size, 1, fp) != 1)
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FATAL_ERROR("Failed to read \"%s\".\n", filename.c_str());
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m_buffer[m_size] = 0;
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std::fclose(fp);
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m_pos = 0;
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m_lineNum = 1;
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m_lineStart = 0;
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RemoveComments();
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}
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AsmFile::AsmFile(AsmFile&& other) : m_filename(std::move(other.m_filename))
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{
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m_buffer = other.m_buffer;
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m_pos = other.m_pos;
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m_size = other.m_size;
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m_lineNum = other.m_lineNum;
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m_lineStart = other.m_lineStart;
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other.m_buffer = nullptr;
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}
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AsmFile::~AsmFile()
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{
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delete[] m_buffer;
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}
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// Removes comments to simplify further processing.
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// It stops upon encountering a null character,
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// which may or may not be the end of file marker.
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// If it's not, the error will be caught later.
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void AsmFile::RemoveComments()
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{
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long pos = 0;
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char stringChar = 0;
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for (;;)
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{
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if (m_buffer[pos] == 0)
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return;
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if (stringChar != 0)
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{
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if (m_buffer[pos] == '\\' && m_buffer[pos + 1] == stringChar)
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{
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pos += 2;
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}
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else
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{
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if (m_buffer[pos] == stringChar)
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stringChar = 0;
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pos++;
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}
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}
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else if (m_buffer[pos] == '@' && (pos == 0 || m_buffer[pos - 1] != '\\'))
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{
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while (m_buffer[pos] != '\n' && m_buffer[pos] != 0)
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m_buffer[pos++] = ' ';
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}
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else if (m_buffer[pos] == '/' && m_buffer[pos + 1] == '*')
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{
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m_buffer[pos++] = ' ';
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m_buffer[pos++] = ' ';
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for (;;)
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{
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if (m_buffer[pos] == 0)
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return;
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if (m_buffer[pos] == '*' && m_buffer[pos + 1] == '/')
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{
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m_buffer[pos++] = ' ';
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m_buffer[pos++] = ' ';
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break;
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}
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else
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{
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if (m_buffer[pos] != '\n')
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m_buffer[pos] = ' ';
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pos++;
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}
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}
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}
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else
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{
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if (m_buffer[pos] == '"' || m_buffer[pos] == '\'')
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stringChar = m_buffer[pos];
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pos++;
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}
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}
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}
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// Checks if we're at a particular directive and if so, consumes it.
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// Returns whether the directive was found.
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bool AsmFile::CheckForDirective(std::string name)
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{
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long i;
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long length = static_cast<long>(name.length());
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for (i = 0; i < length && m_pos + i < m_size; i++)
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if (name[i] != m_buffer[m_pos + i])
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return false;
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if (i < length)
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return false;
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m_pos += length;
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return true;
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}
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// Checks if we're at a known directive and if so, consumes it.
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// Returns which directive was found.
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Directive AsmFile::GetDirective()
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{
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SkipWhitespace();
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if (CheckForDirective(".include"))
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return Directive::Include;
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else if (CheckForDirective(".string"))
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return Directive::String;
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else if (CheckForDirective(".braille"))
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return Directive::Braille;
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else
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return Directive::Unknown;
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}
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// Checks if we're at label that ends with '::'.
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// Returns the name if so and an empty string if not.
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std::string AsmFile::GetGlobalLabel()
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{
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long start = m_pos;
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long pos = m_pos;
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if (IsIdentifierStartingChar(m_buffer[pos]))
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{
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pos++;
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while (IsIdentifierChar(m_buffer[pos]))
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pos++;
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}
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if (m_buffer[pos] == ':' && m_buffer[pos + 1] == ':')
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{
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m_pos = pos + 2;
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ExpectEmptyRestOfLine();
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return std::string(&m_buffer[start], pos - start);
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}
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return std::string();
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}
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// Skips tabs and spaces.
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void AsmFile::SkipWhitespace()
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{
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while (m_buffer[m_pos] == '\t' || m_buffer[m_pos] == ' ')
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m_pos++;
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}
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// Reads include path.
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std::string AsmFile::ReadPath()
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{
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SkipWhitespace();
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if (m_buffer[m_pos] != '"')
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RaiseError("expected file path");
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m_pos++;
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int length = 0;
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long startPos = m_pos;
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while (m_buffer[m_pos] != '"')
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{
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unsigned char c = m_buffer[m_pos++];
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if (c == 0)
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{
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if (m_pos >= m_size)
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RaiseError("unexpected EOF in include string");
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else
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RaiseError("unexpected null character in include string");
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}
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if (!IsAsciiPrintable(c))
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RaiseError("unexpected character '\\x%02X' in include string", c);
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// Don't bother allowing any escape sequences.
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if (c == '\\')
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{
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c = m_buffer[m_pos];
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RaiseError("unexpected escape '\\%c' in include string", c);
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}
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length++;
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if (length > kMaxPath)
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RaiseError("path is too long");
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}
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m_pos++; // Go past the right quote.
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ExpectEmptyRestOfLine();
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return std::string(&m_buffer[startPos], length);
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}
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// Reads a charmap string.
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int AsmFile::ReadString(unsigned char* s)
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{
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SkipWhitespace();
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int length;
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StringParser stringParser(m_buffer, m_size);
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try
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{
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m_pos += stringParser.ParseString(m_pos, s, length);
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}
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catch (std::runtime_error& e)
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{
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RaiseError(e.what());
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}
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SkipWhitespace();
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if (ConsumeComma())
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{
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SkipWhitespace();
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int padLength = ReadPadLength();
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while (length < padLength)
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{
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s[length++] = CHAR_SPACE;
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}
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}
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ExpectEmptyRestOfLine();
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return length;
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}
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void AsmFile::VerifyStringLength(int length)
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{
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if (length == kMaxStringLength)
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RaiseError("mapped string longer than %d bytes", kMaxStringLength);
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}
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int AsmFile::ReadBraille(unsigned char* s)
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{
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static std::map<char, unsigned char> encoding =
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{
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{ 'A', BRAILLE_CHAR_A },
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{ 'B', BRAILLE_CHAR_B },
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{ 'C', BRAILLE_CHAR_C },
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{ 'D', BRAILLE_CHAR_D },
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{ 'E', BRAILLE_CHAR_E },
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{ 'F', BRAILLE_CHAR_F },
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{ 'G', BRAILLE_CHAR_G },
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{ 'H', BRAILLE_CHAR_H },
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{ 'I', BRAILLE_CHAR_I },
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{ 'J', BRAILLE_CHAR_J },
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{ 'K', BRAILLE_CHAR_K },
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{ 'L', BRAILLE_CHAR_L },
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{ 'M', BRAILLE_CHAR_M },
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{ 'N', BRAILLE_CHAR_N },
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{ 'O', BRAILLE_CHAR_O },
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{ 'P', BRAILLE_CHAR_P },
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{ 'Q', BRAILLE_CHAR_Q },
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{ 'R', BRAILLE_CHAR_R },
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{ 'S', BRAILLE_CHAR_S },
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{ 'T', BRAILLE_CHAR_T },
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{ 'U', BRAILLE_CHAR_U },
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{ 'V', BRAILLE_CHAR_V },
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{ 'W', BRAILLE_CHAR_W },
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{ 'X', BRAILLE_CHAR_X },
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{ 'Y', BRAILLE_CHAR_Y },
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{ 'Z', BRAILLE_CHAR_Z },
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{ 'a', BRAILLE_CHAR_A },
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{ 'b', BRAILLE_CHAR_B },
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{ 'c', BRAILLE_CHAR_C },
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{ 'd', BRAILLE_CHAR_D },
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{ 'e', BRAILLE_CHAR_E },
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{ 'f', BRAILLE_CHAR_F },
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{ 'g', BRAILLE_CHAR_G },
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{ 'h', BRAILLE_CHAR_H },
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{ 'i', BRAILLE_CHAR_I },
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{ 'j', BRAILLE_CHAR_J },
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{ 'k', BRAILLE_CHAR_K },
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{ 'l', BRAILLE_CHAR_L },
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{ 'm', BRAILLE_CHAR_M },
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{ 'n', BRAILLE_CHAR_N },
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{ 'o', BRAILLE_CHAR_O },
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{ 'p', BRAILLE_CHAR_P },
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{ 'q', BRAILLE_CHAR_Q },
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{ 'r', BRAILLE_CHAR_R },
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{ 's', BRAILLE_CHAR_S },
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{ 't', BRAILLE_CHAR_T },
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{ 'u', BRAILLE_CHAR_U },
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{ 'v', BRAILLE_CHAR_V },
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{ 'w', BRAILLE_CHAR_W },
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{ 'x', BRAILLE_CHAR_X },
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{ 'y', BRAILLE_CHAR_Y },
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{ 'z', BRAILLE_CHAR_Z },
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{ '0', BRAILLE_CHAR_0 },
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{ '1', BRAILLE_CHAR_1 },
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{ '2', BRAILLE_CHAR_2 },
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{ '3', BRAILLE_CHAR_3 },
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{ '4', BRAILLE_CHAR_4 },
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{ '5', BRAILLE_CHAR_5 },
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{ '6', BRAILLE_CHAR_6 },
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{ '7', BRAILLE_CHAR_7 },
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{ '8', BRAILLE_CHAR_8 },
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{ '9', BRAILLE_CHAR_9 },
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{ ' ', BRAILLE_CHAR_SPACE },
|
||||
{ ',', BRAILLE_CHAR_COMMA },
|
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{ '.', BRAILLE_CHAR_PERIOD },
|
||||
{ '?', BRAILLE_CHAR_QUESTION_MARK },
|
||||
{ '!', BRAILLE_CHAR_EXCL_MARK },
|
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{ ':', BRAILLE_CHAR_COLON },
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{ ';', BRAILLE_CHAR_SEMICOLON },
|
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{ '-', BRAILLE_CHAR_HYPHEN },
|
||||
{ '/', BRAILLE_CHAR_SLASH },
|
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{ '(', BRAILLE_CHAR_PAREN },
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{ ')', BRAILLE_CHAR_PAREN },
|
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{ '\'', BRAILLE_CHAR_APOSTROPHE },
|
||||
{ '#', BRAILLE_CHAR_NUMBER },
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||||
{ '$', EOS },
|
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};
|
||||
|
||||
SkipWhitespace();
|
||||
|
||||
int length = 0;
|
||||
|
||||
if (m_buffer[m_pos] != '"')
|
||||
RaiseError("expected braille string literal");
|
||||
|
||||
m_pos++;
|
||||
|
||||
bool inNumber = false;
|
||||
while (m_buffer[m_pos] != '"')
|
||||
{
|
||||
if (m_buffer[m_pos] == '\\' && m_buffer[m_pos + 1] == 'n')
|
||||
{
|
||||
VerifyStringLength(length);
|
||||
s[length++] = CHAR_NEWLINE;
|
||||
m_pos += 2;
|
||||
}
|
||||
else
|
||||
{
|
||||
char c = m_buffer[m_pos];
|
||||
|
||||
if (encoding.count(c) == 0)
|
||||
{
|
||||
if (IsAsciiPrintable(c))
|
||||
RaiseError("character '%c' not valid in braille string", m_buffer[m_pos]);
|
||||
else
|
||||
RaiseError("character '\\x%02X' not valid in braille string", m_buffer[m_pos]);
|
||||
}
|
||||
|
||||
if (!inNumber && c >= '0' && c <= '9' )
|
||||
{
|
||||
// Output number indicator at start of a number
|
||||
inNumber = true;
|
||||
VerifyStringLength(length);
|
||||
s[length++] = BRAILLE_CHAR_NUMBER;
|
||||
}
|
||||
else if (inNumber && encoding[c] == BRAILLE_CHAR_SPACE)
|
||||
{
|
||||
// Number ends at a space.
|
||||
// Non-number characters encountered before a space will simply be output as is.
|
||||
inNumber = false;
|
||||
}
|
||||
|
||||
VerifyStringLength(length);
|
||||
s[length++] = encoding[c];
|
||||
m_pos++;
|
||||
}
|
||||
}
|
||||
|
||||
m_pos++; // Go past the right quote.
|
||||
|
||||
ExpectEmptyRestOfLine();
|
||||
|
||||
return length;
|
||||
}
|
||||
|
||||
// If we're at a comma, consumes it.
|
||||
// Returns whether a comma was found.
|
||||
bool AsmFile::ConsumeComma()
|
||||
{
|
||||
if (m_buffer[m_pos] == ',')
|
||||
{
|
||||
m_pos++;
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
// Converts digit character to numerical value.
|
||||
static int ConvertDigit(char c, int radix)
|
||||
{
|
||||
int digit;
|
||||
|
||||
if (c >= '0' && c <= '9')
|
||||
digit = c - '0';
|
||||
else if (c >= 'A' && c <= 'F')
|
||||
digit = 10 + c - 'A';
|
||||
else if (c >= 'a' && c <= 'f')
|
||||
digit = 10 + c - 'a';
|
||||
else
|
||||
return -1;
|
||||
|
||||
return (digit < radix) ? digit : -1;
|
||||
}
|
||||
|
||||
// Reads an integer. If the integer is greater than maxValue, it returns -1.
|
||||
int AsmFile::ReadPadLength()
|
||||
{
|
||||
if (!IsAsciiDigit(m_buffer[m_pos]))
|
||||
RaiseError("expected integer");
|
||||
|
||||
int radix = 10;
|
||||
|
||||
if (m_buffer[m_pos] == '0' && m_buffer[m_pos + 1] == 'x')
|
||||
{
|
||||
radix = 16;
|
||||
m_pos += 2;
|
||||
}
|
||||
|
||||
unsigned n = 0;
|
||||
int digit;
|
||||
|
||||
while ((digit = ConvertDigit(m_buffer[m_pos], radix)) != -1)
|
||||
{
|
||||
n = n * radix + digit;
|
||||
|
||||
if (n > kMaxStringLength)
|
||||
RaiseError("pad length greater than maximum length (%d)", kMaxStringLength);
|
||||
|
||||
m_pos++;
|
||||
}
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
// Outputs the current line and moves to the next one.
|
||||
void AsmFile::OutputLine()
|
||||
{
|
||||
while (m_buffer[m_pos] != '\n' && m_buffer[m_pos] != 0)
|
||||
m_pos++;
|
||||
|
||||
if (m_buffer[m_pos] == 0)
|
||||
{
|
||||
if (m_pos >= m_size)
|
||||
{
|
||||
RaiseWarning("file doesn't end with newline");
|
||||
puts(&m_buffer[m_lineStart]);
|
||||
}
|
||||
else
|
||||
{
|
||||
RaiseError("unexpected null character");
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
m_buffer[m_pos] = 0;
|
||||
puts(&m_buffer[m_lineStart]);
|
||||
m_buffer[m_pos] = '\n';
|
||||
m_pos++;
|
||||
m_lineStart = m_pos;
|
||||
m_lineNum++;
|
||||
}
|
||||
}
|
||||
|
||||
// Asserts that the rest of the line is empty and moves to the next one.
|
||||
void AsmFile::ExpectEmptyRestOfLine()
|
||||
{
|
||||
SkipWhitespace();
|
||||
|
||||
if (m_buffer[m_pos] == 0)
|
||||
{
|
||||
if (m_pos >= m_size)
|
||||
RaiseWarning("file doesn't end with newline");
|
||||
else
|
||||
RaiseError("unexpected null character");
|
||||
}
|
||||
else if (m_buffer[m_pos] == '\n')
|
||||
{
|
||||
m_pos++;
|
||||
m_lineStart = m_pos;
|
||||
m_lineNum++;
|
||||
}
|
||||
else if (m_buffer[m_pos] == '\r' && m_buffer[m_pos + 1] == '\n')
|
||||
{
|
||||
m_pos += 2;
|
||||
m_lineStart = m_pos;
|
||||
m_lineNum++;
|
||||
}
|
||||
else
|
||||
{
|
||||
RaiseError("junk at end of line");
|
||||
}
|
||||
}
|
||||
|
||||
// Checks if we're at the end of the file.
|
||||
bool AsmFile::IsAtEnd()
|
||||
{
|
||||
return (m_pos >= m_size);
|
||||
}
|
||||
|
||||
// Output the current location to set gas's logical file and line numbers.
|
||||
void AsmFile::OutputLocation()
|
||||
{
|
||||
std::printf("# %ld \"%s\"\n", m_lineNum, m_filename.c_str());
|
||||
}
|
||||
|
||||
// Reports a diagnostic message.
|
||||
void AsmFile::ReportDiagnostic(const char* type, const char* format, std::va_list args)
|
||||
{
|
||||
const int bufferSize = 1024;
|
||||
char buffer[bufferSize];
|
||||
std::vsnprintf(buffer, bufferSize, format, args);
|
||||
std::fprintf(stderr, "%s:%ld: %s: %s\n", m_filename.c_str(), m_lineNum, type, buffer);
|
||||
}
|
||||
|
||||
#define DO_REPORT(type) \
|
||||
do \
|
||||
{ \
|
||||
std::va_list args; \
|
||||
va_start(args, format); \
|
||||
ReportDiagnostic(type, format, args); \
|
||||
va_end(args); \
|
||||
} while (0)
|
||||
|
||||
// Reports an error diagnostic and terminates the program.
|
||||
void AsmFile::RaiseError(const char* format, ...)
|
||||
{
|
||||
DO_REPORT("error");
|
||||
std::exit(1);
|
||||
}
|
||||
|
||||
// Reports a warning diagnostic.
|
||||
void AsmFile::RaiseWarning(const char* format, ...)
|
||||
{
|
||||
DO_REPORT("warning");
|
||||
}
|
||||
Reference in New Issue
Block a user