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7a51313d8a
lib dir and move all the libraries into it. This follows the main llvm tree, and allows the libraries to be built in parallel. The top level now enforces that all the libs are built before Driver, but we don't care what order the libs are built in. This speeds up parallel builds, particularly incremental ones. llvm-svn: 48402
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//===--- ScratchBuffer.cpp - Scratch space for forming tokens -------------===//
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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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//
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// This file implements the ScratchBuffer interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/ScratchBuffer.h"
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#include "clang/Basic/SourceManager.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cstring>
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using namespace clang;
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// ScratchBufSize - The size of each chunk of scratch memory. Slightly less
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//than a page, almost certainly enough for anything. :)
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static const unsigned ScratchBufSize = 4060;
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ScratchBuffer::ScratchBuffer(SourceManager &SM) : SourceMgr(SM), CurBuffer(0) {
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// Set BytesUsed so that the first call to getToken will require an alloc.
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BytesUsed = ScratchBufSize;
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FileID = 0;
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}
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/// getToken - Splat the specified text into a temporary MemoryBuffer and
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/// return a SourceLocation that refers to the token. This is just like the
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/// method below, but returns a location that indicates the physloc of the
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/// token.
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SourceLocation ScratchBuffer::getToken(const char *Buf, unsigned Len) {
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if (BytesUsed+Len > ScratchBufSize)
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AllocScratchBuffer(Len);
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// Copy the token data into the buffer.
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memcpy(CurBuffer+BytesUsed, Buf, Len);
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// Remember that we used these bytes.
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BytesUsed += Len;
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assert(BytesUsed-Len < (1 << SourceLocation::FilePosBits) &&
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"Out of range file position!");
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return SourceLocation::getFileLoc(FileID, BytesUsed-Len);
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}
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/// getToken - Splat the specified text into a temporary MemoryBuffer and
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/// return a SourceLocation that refers to the token. The SourceLoc value
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/// gives a virtual location that the token will appear to be from.
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SourceLocation ScratchBuffer::getToken(const char *Buf, unsigned Len,
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SourceLocation SourceLoc) {
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// Map the physloc to the specified sourceloc.
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return SourceMgr.getInstantiationLoc(getToken(Buf, Len), SourceLoc);
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}
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void ScratchBuffer::AllocScratchBuffer(unsigned RequestLen) {
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// Only pay attention to the requested length if it is larger than our default
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// page size. If it is, we allocate an entire chunk for it. This is to
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// support gigantic tokens, which almost certainly won't happen. :)
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if (RequestLen < ScratchBufSize)
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RequestLen = ScratchBufSize;
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llvm::MemoryBuffer *Buf =
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llvm::MemoryBuffer::getNewMemBuffer(RequestLen, "<scratch space>");
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FileID = SourceMgr.createFileIDForMemBuffer(Buf);
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CurBuffer = const_cast<char*>(Buf->getBufferStart());
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BytesUsed = 0;
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}
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