1
0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-21 16:31:16 +00:00
llvm-6502/lib/Support/SourceMgr.cpp
Jordan Rose 3ebe59c892 Change SMRange to be half-open (exclusive end) instead of closed (inclusive)
This is necessary not only for representing empty ranges, but for handling
multibyte characters in the input. (If the end pointer in a range refers to
a multibyte character, should it point to the beginning or the end of the
character in a char array?) Some of the code in the asm parsers was already
assuming this anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171765 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-07 19:00:49 +00:00

361 lines
11 KiB
C++

//===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the SourceMgr class. This class is used as a simple
// substrate for diagnostics, #include handling, and other low level things for
// simple parsers.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/SourceMgr.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
using namespace llvm;
namespace {
struct LineNoCacheTy {
int LastQueryBufferID;
const char *LastQuery;
unsigned LineNoOfQuery;
};
}
static LineNoCacheTy *getCache(void *Ptr) {
return (LineNoCacheTy*)Ptr;
}
SourceMgr::~SourceMgr() {
// Delete the line # cache if allocated.
if (LineNoCacheTy *Cache = getCache(LineNoCache))
delete Cache;
while (!Buffers.empty()) {
delete Buffers.back().Buffer;
Buffers.pop_back();
}
}
/// AddIncludeFile - Search for a file with the specified name in the current
/// directory or in one of the IncludeDirs. If no file is found, this returns
/// ~0, otherwise it returns the buffer ID of the stacked file.
unsigned SourceMgr::AddIncludeFile(const std::string &Filename,
SMLoc IncludeLoc,
std::string &IncludedFile) {
OwningPtr<MemoryBuffer> NewBuf;
IncludedFile = Filename;
MemoryBuffer::getFile(IncludedFile.c_str(), NewBuf);
// If the file didn't exist directly, see if it's in an include path.
for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) {
IncludedFile = IncludeDirectories[i] + "/" + Filename;
MemoryBuffer::getFile(IncludedFile.c_str(), NewBuf);
}
if (NewBuf == 0) return ~0U;
return AddNewSourceBuffer(NewBuf.take(), IncludeLoc);
}
/// FindBufferContainingLoc - Return the ID of the buffer containing the
/// specified location, returning -1 if not found.
int SourceMgr::FindBufferContainingLoc(SMLoc Loc) const {
for (unsigned i = 0, e = Buffers.size(); i != e; ++i)
if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() &&
// Use <= here so that a pointer to the null at the end of the buffer
// is included as part of the buffer.
Loc.getPointer() <= Buffers[i].Buffer->getBufferEnd())
return i;
return -1;
}
/// getLineAndColumn - Find the line and column number for the specified
/// location in the specified file. This is not a fast method.
std::pair<unsigned, unsigned>
SourceMgr::getLineAndColumn(SMLoc Loc, int BufferID) const {
if (BufferID == -1) BufferID = FindBufferContainingLoc(Loc);
assert(BufferID != -1 && "Invalid Location!");
MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer;
// Count the number of \n's between the start of the file and the specified
// location.
unsigned LineNo = 1;
const char *BufStart = Buff->getBufferStart();
const char *Ptr = BufStart;
// If we have a line number cache, and if the query is to a later point in the
// same file, start searching from the last query location. This optimizes
// for the case when multiple diagnostics come out of one file in order.
if (LineNoCacheTy *Cache = getCache(LineNoCache))
if (Cache->LastQueryBufferID == BufferID &&
Cache->LastQuery <= Loc.getPointer()) {
Ptr = Cache->LastQuery;
LineNo = Cache->LineNoOfQuery;
}
// Scan for the location being queried, keeping track of the number of lines
// we see.
for (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr)
if (*Ptr == '\n') ++LineNo;
// Allocate the line number cache if it doesn't exist.
if (LineNoCache == 0)
LineNoCache = new LineNoCacheTy();
// Update the line # cache.
LineNoCacheTy &Cache = *getCache(LineNoCache);
Cache.LastQueryBufferID = BufferID;
Cache.LastQuery = Ptr;
Cache.LineNoOfQuery = LineNo;
size_t NewlineOffs = StringRef(BufStart, Ptr-BufStart).find_last_of("\n\r");
if (NewlineOffs == StringRef::npos) NewlineOffs = ~(size_t)0;
return std::make_pair(LineNo, Ptr-BufStart-NewlineOffs);
}
void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const {
if (IncludeLoc == SMLoc()) return; // Top of stack.
int CurBuf = FindBufferContainingLoc(IncludeLoc);
assert(CurBuf != -1 && "Invalid or unspecified location!");
PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc, OS);
OS << "Included from "
<< getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
<< ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n";
}
/// GetMessage - Return an SMDiagnostic at the specified location with the
/// specified string.
///
/// @param Type - If non-null, the kind of message (e.g., "error") which is
/// prefixed to the message.
SMDiagnostic SourceMgr::GetMessage(SMLoc Loc, SourceMgr::DiagKind Kind,
const Twine &Msg,
ArrayRef<SMRange> Ranges) const {
// First thing to do: find the current buffer containing the specified
// location to pull out the source line.
SmallVector<std::pair<unsigned, unsigned>, 4> ColRanges;
std::pair<unsigned, unsigned> LineAndCol;
const char *BufferID = "<unknown>";
std::string LineStr;
if (Loc.isValid()) {
int CurBuf = FindBufferContainingLoc(Loc);
assert(CurBuf != -1 && "Invalid or unspecified location!");
MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;
BufferID = CurMB->getBufferIdentifier();
// Scan backward to find the start of the line.
const char *LineStart = Loc.getPointer();
const char *BufStart = CurMB->getBufferStart();
while (LineStart != BufStart && LineStart[-1] != '\n' &&
LineStart[-1] != '\r')
--LineStart;
// Get the end of the line.
const char *LineEnd = Loc.getPointer();
const char *BufEnd = CurMB->getBufferEnd();
while (LineEnd != BufEnd && LineEnd[0] != '\n' && LineEnd[0] != '\r')
++LineEnd;
LineStr = std::string(LineStart, LineEnd);
// Convert any ranges to column ranges that only intersect the line of the
// location.
for (unsigned i = 0, e = Ranges.size(); i != e; ++i) {
SMRange R = Ranges[i];
if (!R.isValid()) continue;
// If the line doesn't contain any part of the range, then ignore it.
if (R.Start.getPointer() > LineEnd || R.End.getPointer() < LineStart)
continue;
// Ignore pieces of the range that go onto other lines.
if (R.Start.getPointer() < LineStart)
R.Start = SMLoc::getFromPointer(LineStart);
if (R.End.getPointer() > LineEnd)
R.End = SMLoc::getFromPointer(LineEnd);
// Translate from SMLoc ranges to column ranges.
ColRanges.push_back(std::make_pair(R.Start.getPointer()-LineStart,
R.End.getPointer()-LineStart));
}
LineAndCol = getLineAndColumn(Loc, CurBuf);
}
return SMDiagnostic(*this, Loc, BufferID, LineAndCol.first,
LineAndCol.second-1, Kind, Msg.str(),
LineStr, ColRanges);
}
void SourceMgr::PrintMessage(SMLoc Loc, SourceMgr::DiagKind Kind,
const Twine &Msg, ArrayRef<SMRange> Ranges,
bool ShowColors) const {
SMDiagnostic Diagnostic = GetMessage(Loc, Kind, Msg, Ranges);
// Report the message with the diagnostic handler if present.
if (DiagHandler) {
DiagHandler(Diagnostic, DiagContext);
return;
}
raw_ostream &OS = errs();
if (Loc != SMLoc()) {
int CurBuf = FindBufferContainingLoc(Loc);
assert(CurBuf != -1 && "Invalid or unspecified location!");
PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc, OS);
}
Diagnostic.print(0, OS, ShowColors);
}
//===----------------------------------------------------------------------===//
// SMDiagnostic Implementation
//===----------------------------------------------------------------------===//
SMDiagnostic::SMDiagnostic(const SourceMgr &sm, SMLoc L, const std::string &FN,
int Line, int Col, SourceMgr::DiagKind Kind,
const std::string &Msg,
const std::string &LineStr,
ArrayRef<std::pair<unsigned,unsigned> > Ranges)
: SM(&sm), Loc(L), Filename(FN), LineNo(Line), ColumnNo(Col), Kind(Kind),
Message(Msg), LineContents(LineStr), Ranges(Ranges.vec()) {
}
void SMDiagnostic::print(const char *ProgName, raw_ostream &S,
bool ShowColors) const {
// Display colors only if OS supports colors.
ShowColors &= S.has_colors();
if (ShowColors)
S.changeColor(raw_ostream::SAVEDCOLOR, true);
if (ProgName && ProgName[0])
S << ProgName << ": ";
if (!Filename.empty()) {
if (Filename == "-")
S << "<stdin>";
else
S << Filename;
if (LineNo != -1) {
S << ':' << LineNo;
if (ColumnNo != -1)
S << ':' << (ColumnNo+1);
}
S << ": ";
}
switch (Kind) {
case SourceMgr::DK_Error:
if (ShowColors)
S.changeColor(raw_ostream::RED, true);
S << "error: ";
break;
case SourceMgr::DK_Warning:
if (ShowColors)
S.changeColor(raw_ostream::MAGENTA, true);
S << "warning: ";
break;
case SourceMgr::DK_Note:
if (ShowColors)
S.changeColor(raw_ostream::BLACK, true);
S << "note: ";
break;
}
if (ShowColors) {
S.resetColor();
S.changeColor(raw_ostream::SAVEDCOLOR, true);
}
S << Message << '\n';
if (ShowColors)
S.resetColor();
if (LineNo == -1 || ColumnNo == -1)
return;
// Build the line with the caret and ranges.
std::string CaretLine(LineContents.size()+1, ' ');
// Expand any ranges.
for (unsigned r = 0, e = Ranges.size(); r != e; ++r) {
std::pair<unsigned, unsigned> R = Ranges[r];
for (unsigned i = R.first,
e = std::min(R.second, (unsigned)LineContents.size()); i != e; ++i)
CaretLine[i] = '~';
}
// Finally, plop on the caret.
if (unsigned(ColumnNo) <= LineContents.size())
CaretLine[ColumnNo] = '^';
else
CaretLine[LineContents.size()] = '^';
// ... and remove trailing whitespace so the output doesn't wrap for it. We
// know that the line isn't completely empty because it has the caret in it at
// least.
CaretLine.erase(CaretLine.find_last_not_of(' ')+1);
// Print out the source line one character at a time, so we can expand tabs.
for (unsigned i = 0, e = LineContents.size(), OutCol = 0; i != e; ++i) {
if (LineContents[i] != '\t') {
S << LineContents[i];
++OutCol;
continue;
}
// If we have a tab, emit at least one space, then round up to 8 columns.
do {
S << ' ';
++OutCol;
} while (OutCol & 7);
}
S << '\n';
if (ShowColors)
S.changeColor(raw_ostream::GREEN, true);
// Print out the caret line, matching tabs in the source line.
for (unsigned i = 0, e = CaretLine.size(), OutCol = 0; i != e; ++i) {
if (i >= LineContents.size() || LineContents[i] != '\t') {
S << CaretLine[i];
++OutCol;
continue;
}
// Okay, we have a tab. Insert the appropriate number of characters.
do {
S << CaretLine[i];
++OutCol;
} while (OutCol & 7);
}
if (ShowColors)
S.resetColor();
S << '\n';
}