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58c8bd07e6
Previously, yaml2coff.cpp had a writeHexData static helper function to do this, but it is generally useful functionality. Also, validate hex strings up-front to avoid running having to handle errors "deep inside" the yaml2obj code (it also gives better diagnostics than it used to). llvm-svn: 183345
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//===- YAML.cpp - YAMLIO utilities for object files -----------------------===//
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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 defines utility classes for handling the YAML representation of
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// object files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/YAML.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace object::yaml;
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void yaml::ScalarTraits<object::yaml::BinaryRef>::output(
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const object::yaml::BinaryRef &Val, void *, llvm::raw_ostream &Out) {
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ArrayRef<uint8_t> Data = Val.getBinary();
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for (ArrayRef<uint8_t>::iterator I = Data.begin(), E = Data.end(); I != E;
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++I) {
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uint8_t Byte = *I;
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Out << hexdigit(Byte >> 4);
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Out << hexdigit(Byte & 0xf);
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}
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}
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// Can't find this anywhere else in the codebase (clang has one, but it has
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// some baggage). Deduplicate as required.
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static bool isHexDigit(uint8_t C) {
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return ('0' <= C && C <= '9') ||
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('A' <= C && C <= 'F') ||
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('a' <= C && C <= 'f');
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}
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StringRef yaml::ScalarTraits<object::yaml::BinaryRef>::input(
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StringRef Scalar, void *, object::yaml::BinaryRef &Val) {
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if (Scalar.size() % 2 != 0)
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return "BinaryRef hex string must contain an even number of nybbles.";
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// TODO: Can we improve YAMLIO to permit a more accurate diagnostic here?
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// (e.g. a caret pointing to the offending character).
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for (unsigned I = 0, N = Scalar.size(); I != N; ++I)
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if (!isHexDigit(Scalar[I]))
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return "BinaryRef hex string must contain only hex digits.";
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Val = object::yaml::BinaryRef(Scalar);
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return StringRef();
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}
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void BinaryRef::writeAsBinary(raw_ostream &OS) const {
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if (isBinary) {
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OS.write((const char *)Data.data(), Data.size());
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return;
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}
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for (unsigned I = 0, N = Data.size(); I != N; I += 2) {
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uint8_t Byte;
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StringRef((const char *)&Data[I], 2).getAsInteger(16, Byte);
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OS.write(Byte);
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}
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}
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