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| author | dim <dim@FreeBSD.org> | 2014-11-24 17:02:24 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2014-11-24 17:02:24 +0000 |
| commit | 2c8643c6396b0a3db33430cf9380e70bbb9efce0 (patch) | |
| tree | 4df130b28021d86e13bf4565ef58c1c5a5e093b4 /contrib/llvm/lib/Support/LineIterator.cpp | |
| parent | 678318cd20f7db4e6c6b85d83fe00fa327b04fca (diff) | |
| parent | e27feadae0885aa074df58ebfda2e7a7f7a7d590 (diff) | |
| download | FreeBSD-src-2c8643c6396b0a3db33430cf9380e70bbb9efce0.zip FreeBSD-src-2c8643c6396b0a3db33430cf9380e70bbb9efce0.tar.gz | |
Merge llvm 3.5.0 release from ^/vendor/llvm/dist, resolve conflicts, and
preserve our customizations, where necessary.
Diffstat (limited to 'contrib/llvm/lib/Support/LineIterator.cpp')
| -rw-r--r-- | contrib/llvm/lib/Support/LineIterator.cpp | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/LineIterator.cpp b/contrib/llvm/lib/Support/LineIterator.cpp new file mode 100644 index 0000000..947a8fb --- /dev/null +++ b/contrib/llvm/lib/Support/LineIterator.cpp @@ -0,0 +1,69 @@ +//===- LineIterator.cpp - Implementation of line iteration ----------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Support/LineIterator.h" +#include "llvm/Support/MemoryBuffer.h" + +using namespace llvm; + +line_iterator::line_iterator(const MemoryBuffer &Buffer, char CommentMarker) + : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr), + CommentMarker(CommentMarker), LineNumber(1), + CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr, + 0) { + // Ensure that if we are constructed on a non-empty memory buffer that it is + // a null terminated buffer. + if (Buffer.getBufferSize()) { + assert(Buffer.getBufferEnd()[0] == '\0'); + advance(); + } +} + +void line_iterator::advance() { + assert(Buffer && "Cannot advance past the end!"); + + const char *Pos = CurrentLine.end(); + assert(Pos == Buffer->getBufferStart() || *Pos == '\n' || *Pos == '\0'); + + if (CommentMarker == '\0') { + // If we're not stripping comments, this is simpler. + size_t Blanks = 0; + while (Pos[Blanks] == '\n') + ++Blanks; + Pos += Blanks; + LineNumber += Blanks; + } else { + // Skip comments and count line numbers, which is a bit more complex. + for (;;) { + if (*Pos == CommentMarker) + do { + ++Pos; + } while (*Pos != '\0' && *Pos != '\n'); + if (*Pos != '\n') + break; + ++Pos; + ++LineNumber; + } + } + + if (*Pos == '\0') { + // We've hit the end of the buffer, reset ourselves to the end state. + Buffer = nullptr; + CurrentLine = StringRef(); + return; + } + + // Measure the line. + size_t Length = 0; + do { + ++Length; + } while (Pos[Length] != '\0' && Pos[Length] != '\n'); + + CurrentLine = StringRef(Pos, Length); +} |
