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When preprocessing resource scripts (which can easily be done outside of llvm-rc), included headers can leave behind C declarations (despite preprocessing with -DRC_INVOKED), that can't be parsed by a resource compiler. This is handled in all of rc.exe, by parsing the preprocessor output line markers and ignoring content from files named *.h and *.c, documented at [1]. In addition to this filtering, strip out any other preprocessor directive that is left behind (like pragmas) which also can't be handled by the tokenizer. The added test uses both standard #line markers (supported by rc.exe) and GNU style extended line markers, thus this test doesn't pass with rc.exe, but passes with GNU windres. (Windres on the other hand doesn't filter out files named *.c, only *.h.) Differential Revision: https://reviews.llvm.org/D46579 [1] https://msdn.microsoft.com/en-us/library/windows/desktop/aa381033(v=vs.85).aspx git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331903 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
//===-- ResourceScriptCppFilter.cpp ----------------------------*- C++ -*-===//
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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 an interface defined in ResourceScriptCppFilter.h.
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//
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//===---------------------------------------------------------------------===//
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#include "ResourceScriptCppFilter.h"
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#include "llvm/ADT/StringExtras.h"
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#include <vector>
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using namespace llvm;
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namespace {
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class Filter {
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public:
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explicit Filter(StringRef Input) : Data(Input), DataLength(Input.size()) {}
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std::string run();
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private:
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// Parse the line, returning whether the line should be included in
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// the output.
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bool parseLine(StringRef Line);
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bool streamEof() const;
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StringRef Data;
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size_t DataLength;
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size_t Pos = 0;
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bool Outputting = true;
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};
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std::string Filter::run() {
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std::vector<StringRef> Output;
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while (!streamEof() && Pos != StringRef::npos) {
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size_t LineStart = Pos;
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Pos = Data.find_first_of("\r\n", Pos);
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Pos = Data.find_first_not_of("\r\n", Pos);
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StringRef Line = Data.take_front(Pos).drop_front(LineStart);
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if (parseLine(Line))
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Output.push_back(Line);
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}
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return llvm::join(Output, "");
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}
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bool Filter::parseLine(StringRef Line) {
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Line = Line.ltrim();
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if (!Line.consume_front("#")) {
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// A normal content line, filtered according to the current mode.
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return Outputting;
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}
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// Found a preprocessing directive line. From here on, we always return
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// false since the preprocessing directives should be filtered out.
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Line.consume_front("line");
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if (!Line.startswith(" "))
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return false; // Not a line directive (pragma etc).
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// #line 123 "path/file.h"
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// # 123 "path/file.h" 1
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Line =
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Line.ltrim(); // There could be multiple spaces after the #line directive
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size_t N;
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if (Line.consumeInteger(10, N)) // Returns true to signify an error
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return false;
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Line = Line.ltrim();
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if (!Line.consume_front("\""))
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return false; // Malformed line, no quote found.
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// Split the string at the last quote (in case the path name had
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// escaped quotes as well).
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Line = Line.rsplit('"').first;
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StringRef Ext = Line.rsplit('.').second;
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if (Ext.equals_lower("h") || Ext.equals_lower("c")) {
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Outputting = false;
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} else {
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Outputting = true;
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}
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return false;
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}
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bool Filter::streamEof() const { return Pos == DataLength; }
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} // anonymous namespace
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namespace llvm {
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std::string filterCppOutput(StringRef Input) { return Filter(Input).run(); }
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} // namespace llvm
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