forked from OSchip/llvm-project
318 lines
8.5 KiB
C++
318 lines
8.5 KiB
C++
//===-- SourceManager.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/Core/SourceManager.h"
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Core/DataBuffer.h"
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#include "lldb/Core/Stream.h"
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using namespace lldb_private;
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static inline bool is_newline_char(char ch)
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{
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return ch == '\n' || ch == '\r';
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}
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//----------------------------------------------------------------------
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// SourceManager constructor
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//----------------------------------------------------------------------
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SourceManager::SourceManager() :
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m_file_cache (),
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m_last_file_sp (),
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m_last_file_line (0),
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m_last_file_context_before (0),
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m_last_file_context_after (0)
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{
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}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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SourceManager::~SourceManager()
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{
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}
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size_t
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SourceManager::DisplaySourceLines
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(
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const FileSpec &file_spec,
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uint32_t line,
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uint32_t context_before,
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uint32_t context_after,
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Stream *s
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)
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{
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m_last_file_sp = GetFile (file_spec);
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m_last_file_line = line + context_after + 1;
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m_last_file_context_before = context_before;
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m_last_file_context_after = context_after;
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if (m_last_file_sp.get())
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return m_last_file_sp->DisplaySourceLines (line, context_before, context_after, s);
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return 0;
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}
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SourceManager::FileSP
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SourceManager::GetFile (const FileSpec &file_spec)
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{
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FileSP file_sp;
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FileCache::iterator pos = m_file_cache.find(file_spec);
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if (pos != m_file_cache.end())
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file_sp = pos->second;
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else
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{
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file_sp.reset (new File (file_spec));
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m_file_cache[file_spec] = file_sp;
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}
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return file_sp;
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}
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size_t
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SourceManager::DisplaySourceLinesWithLineNumbersUsingLastFile
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(
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uint32_t line,
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uint32_t context_before,
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uint32_t context_after,
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const char* current_line_cstr,
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Stream *s
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)
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{
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if (line == 0)
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{
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if (m_last_file_line != 0
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&& m_last_file_line != UINT32_MAX)
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line = m_last_file_line + context_before;
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else
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line = 1;
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}
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m_last_file_line = line + context_after + 1;
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m_last_file_context_before = context_before;
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m_last_file_context_after = context_after;
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if (context_before == UINT32_MAX)
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context_before = 0;
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if (context_after == UINT32_MAX)
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context_after = 10;
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if (m_last_file_sp.get())
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{
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const uint32_t start_line = line <= context_before ? 1 : line - context_before;
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const uint32_t end_line = line + context_after;
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uint32_t curr_line;
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for (curr_line = start_line; curr_line <= end_line; ++curr_line)
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{
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if (!m_last_file_sp->LineIsValid (curr_line))
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{
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m_last_file_line = UINT32_MAX;
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break;
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}
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s->Printf("%4u %2.2s\t", curr_line, curr_line == line ? current_line_cstr : "");
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if (m_last_file_sp->DisplaySourceLines (curr_line, 0, 0, s) == 0)
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{
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m_last_file_line = UINT32_MAX;
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break;
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}
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}
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}
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return 0;
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}
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size_t
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SourceManager::DisplaySourceLinesWithLineNumbers
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(
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const FileSpec &file_spec,
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uint32_t line,
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uint32_t context_before,
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uint32_t context_after,
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const char* current_line_cstr,
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Stream *s
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)
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{
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bool same_as_previous = m_last_file_sp && m_last_file_sp->FileSpecMatches (file_spec);
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if (!same_as_previous)
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m_last_file_sp = GetFile (file_spec);
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if (line == 0)
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{
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if (!same_as_previous)
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m_last_file_line = 0;
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}
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return DisplaySourceLinesWithLineNumbersUsingLastFile (line, context_before, context_after, current_line_cstr, s);
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}
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size_t
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SourceManager::DisplayMoreWithLineNumbers (Stream *s)
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{
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if (m_last_file_sp)
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{
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if (m_last_file_line == UINT32_MAX)
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return 0;
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DisplaySourceLinesWithLineNumbersUsingLastFile (0, m_last_file_context_before, m_last_file_context_after, "", s);
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}
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return 0;
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}
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SourceManager::File::File(const FileSpec &file_spec) :
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m_file_spec(file_spec),
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m_mod_time (m_file_spec.GetModificationTime()),
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m_data_sp(file_spec.ReadFileContents ()),
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m_offsets()
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{
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}
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SourceManager::File::~File()
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{
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}
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uint32_t
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SourceManager::File::GetLineOffset (uint32_t line)
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{
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if (line == 0)
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return UINT32_MAX;
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if (line == 1)
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return 0;
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if (CalculateLineOffsets (line))
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{
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if (line < m_offsets.size())
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return m_offsets[line - 1]; // yes we want "line - 1" in the index
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}
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return UINT32_MAX;
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}
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bool
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SourceManager::File::LineIsValid (uint32_t line)
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{
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if (line == 0)
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return false;
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if (CalculateLineOffsets (line))
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return line < m_offsets.size();
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return false;
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}
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size_t
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SourceManager::File::DisplaySourceLines (uint32_t line, uint32_t context_before, uint32_t context_after, Stream *s)
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{
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// TODO: use host API to sign up for file modifications to anything in our
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// source cache and only update when we determine a file has been updated.
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// For now we check each time we want to display info for the file.
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TimeValue curr_mod_time (m_file_spec.GetModificationTime());
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if (m_mod_time != curr_mod_time)
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{
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m_mod_time = curr_mod_time;
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m_data_sp = m_file_spec.ReadFileContents ();
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m_offsets.clear();
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}
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const uint32_t start_line = line <= context_before ? 1 : line - context_before;
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const uint32_t start_line_offset = GetLineOffset (start_line);
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if (start_line_offset != UINT32_MAX)
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{
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const uint32_t end_line = line + context_after;
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uint32_t end_line_offset = GetLineOffset (end_line + 1);
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if (end_line_offset == UINT32_MAX)
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end_line_offset = m_data_sp->GetByteSize();
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assert (start_line_offset <= end_line_offset);
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size_t bytes_written = 0;
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if (start_line_offset < end_line_offset)
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{
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size_t count = end_line_offset - start_line_offset;
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const uint8_t *cstr = m_data_sp->GetBytes() + start_line_offset;
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bytes_written = s->Write(cstr, count);
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if (!is_newline_char(cstr[count-1]))
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bytes_written += s->EOL();
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}
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return bytes_written;
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}
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return 0;
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}
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bool
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SourceManager::File::FileSpecMatches (const FileSpec &file_spec)
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{
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return FileSpec::Compare (m_file_spec, file_spec, false) == 0;
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}
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bool
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SourceManager::File::CalculateLineOffsets (uint32_t line)
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{
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line = UINT32_MAX; // TODO: take this line out when we support partial indexing
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if (line == UINT32_MAX)
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{
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// Already done?
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if (!m_offsets.empty() && m_offsets[0] == UINT32_MAX)
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return true;
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if (m_offsets.empty())
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{
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if (m_data_sp.get() == NULL)
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return false;
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const char *start = (char *)m_data_sp->GetBytes();
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if (start)
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{
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const char *end = start + m_data_sp->GetByteSize();
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// Calculate all line offsets from scratch
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// Push a 1 at index zero to indicate the file has been completely indexed.
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m_offsets.push_back(UINT32_MAX);
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register const char *s;
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for (s = start; s < end; ++s)
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{
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register char curr_ch = *s;
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if (is_newline_char (curr_ch))
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{
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register char next_ch = s[1];
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if (is_newline_char (next_ch))
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{
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if (curr_ch != next_ch)
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++s;
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}
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m_offsets.push_back(s + 1 - start);
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}
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}
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if (!m_offsets.empty())
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{
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if (m_offsets.back() < end - start)
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m_offsets.push_back(end - start);
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}
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return true;
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}
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}
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else
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{
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// Some lines have been populated, start where we last left off
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assert(!"Not implemented yet");
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}
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}
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else
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{
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// Calculate all line offsets up to "line"
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assert(!"Not implemented yet");
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}
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return false;
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}
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