Generator.cpp
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//===---- Implementation of the main header generation class -----*- C++ -*===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Generator.h"
#include "IncludeFileCommand.h"
#include "PublicAPICommand.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdlib>
#include <memory>
static const char CommandPrefix[] = "%%";
static const size_t CommandPrefixSize = llvm::StringRef(CommandPrefix).size();
static const char CommentPrefix[] = "<!>";
static const char ParamNamePrefix[] = "${";
static const size_t ParamNamePrefixSize =
llvm::StringRef(ParamNamePrefix).size();
static const char ParamNameSuffix[] = "}";
static const size_t ParamNameSuffixSize =
llvm::StringRef(ParamNameSuffix).size();
namespace llvm_libc {
Command *Generator::getCommandHandler(llvm::StringRef CommandName) {
if (CommandName == IncludeFileCommand::Name) {
if (!IncludeFileCmd)
IncludeFileCmd = std::make_unique<IncludeFileCommand>();
return IncludeFileCmd.get();
} else if (CommandName == PublicAPICommand::Name) {
if (!PublicAPICmd)
PublicAPICmd = std::make_unique<PublicAPICommand>();
return PublicAPICmd.get();
} else {
return nullptr;
}
}
void Generator::parseCommandArgs(llvm::StringRef ArgStr, ArgVector &Args) {
if (!ArgStr.contains(',') && ArgStr.trim(' ').trim('\t').size() == 0) {
// If it is just space between the parenthesis
return;
}
ArgStr.split(Args, ",");
for (llvm::StringRef &A : Args) {
A = A.trim(' ');
if (A.startswith(ParamNamePrefix) && A.endswith(ParamNameSuffix)) {
A = A.drop_front(ParamNamePrefixSize).drop_back(ParamNameSuffixSize);
A = ArgMap[A];
}
}
}
void Generator::generate(llvm::raw_ostream &OS, llvm::RecordKeeper &Records) {
auto DefFileBuffer = llvm::MemoryBuffer::getFile(HeaderDefFile);
if (!DefFileBuffer) {
llvm::errs() << "Unable to open " << HeaderDefFile << ".\n";
std::exit(1);
}
llvm::SourceMgr SrcMgr;
unsigned DefFileID = SrcMgr.AddNewSourceBuffer(
std::move(DefFileBuffer.get()), llvm::SMLoc::getFromPointer(nullptr));
llvm::StringRef Content = SrcMgr.getMemoryBuffer(DefFileID)->getBuffer();
while (true) {
std::pair<llvm::StringRef, llvm::StringRef> P = Content.split('\n');
Content = P.second;
llvm::StringRef Line = P.first.trim(' ');
if (Line.startswith(CommandPrefix)) {
Line = Line.drop_front(CommandPrefixSize);
P = Line.split("(");
if (P.second.empty() || P.second[P.second.size() - 1] != ')') {
SrcMgr.PrintMessage(llvm::SMLoc::getFromPointer(P.second.data()),
llvm::SourceMgr::DK_Error,
"Command argument list should begin with '(' "
"and end with ')'.");
std::exit(1);
}
llvm::StringRef CommandName = P.first;
Command *Cmd = getCommandHandler(CommandName);
if (Cmd == nullptr) {
SrcMgr.PrintMessage(llvm::SMLoc::getFromPointer(CommandName.data()),
llvm::SourceMgr::DK_Error,
"Unknown command '%%" + CommandName + "'.");
std::exit(1);
}
llvm::StringRef ArgStr = P.second.drop_back(1);
ArgVector Args;
parseCommandArgs(ArgStr, Args);
Command::ErrorReporter Reporter(
llvm::SMLoc::getFromPointer(CommandName.data()), SrcMgr);
Cmd->run(OS, Args, StdHeader, Records, Reporter);
} else if (!Line.startswith(CommentPrefix)) {
// There is no comment or command on this line so we just write it as is.
OS << P.first << "\n";
}
if (P.second.empty())
break;
}
}
} // namespace llvm_libc