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//===-- DependencyInfoParser.cpp ------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "llbuild/Core/DependencyInfoParser.h"
using namespace llbuild;
using namespace llbuild::core;
DependencyInfoParser::ParseActions::~ParseActions() {}
#pragma mark - DependencyInfoParser Implementation
namespace {
// This format isn't really documented anywhere other than the ld64 source,
// see, e.g.:
//
// http://www.opensource.apple.com/source/ld64/ld64-253.3/src/ld/Options.h
//
// and:
//
// http://www.opensource.apple.com/source/ld64/ld64-253.3/src/ld/Options.cpp
// The format itself is very simple, it is just a sequence of (<opcode>,
// <C-string operand>). The version record is required to be the first version
// in the file.
/// The known set of opcodes.
enum class Opcode : uint8_t {
/// Version information of the producer.
Version = 0x00,
/// An input path.
Input = 0x10,
/// A missing file.
Missing = 0x11,
/// An output path,
Output = 0x40,
};
}
void DependencyInfoParser::parse() {
// Validate that the file ends with a null byte, if not it is malformed and we
// just bail on parsing.
if (!data.endswith(StringRef("\0", 1))) {
actions.error("missing null terminator", data.size());
return;
}
// Validate that the file starts with the version record.
if (Opcode(data[0]) != Opcode::Version) {
actions.error("missing version record", 0);
return;
}
// Parse the records in turn.
const char* cur = data.begin();
const char* end = data.end();
while (cur != end) {
const char* opcodeStart = cur;
auto opcode = Opcode(*cur++);
const char* operandStart = cur;
while (*cur != '\0') {
++cur;
// We require the file have a terminating null, so we can never scan past
// the end.
assert (cur < end);
}
const char* operandEnd = cur;
assert(*operandEnd == '\x00' && cur < end);
++cur;
// Diagnose empty operands (missing isn't possible.
auto operand = StringRef(operandStart, operandEnd - operandStart);
if (operand.empty()) {
actions.error("empty operand", opcodeStart - data.data());
break;
}
// Handle the opcode.
switch (opcode) {
case Opcode::Version: {
// Diagnose duplicate version records.
if (opcodeStart != data.begin()) {
actions.error("invalid duplicate version", opcodeStart - data.data());
break;
}
actions.actOnVersion(operand);
break;
}
case Opcode::Input: {
actions.actOnInput(operand);
break;
}
case Opcode::Missing: {
actions.actOnMissing(operand);
break;
}
case Opcode::Output: {
actions.actOnOutput(operand);
break;
}
default:
actions.error("unknown opcode in file", opcodeStart - data.data());
break;
}
}
}
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