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|
//===- lib/Driver/WinLinkModuleDef.cpp ------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief Windows module definition file parser.
///
//===----------------------------------------------------------------------===//
#include "lld/Driver/WinLinkModuleDef.h"
#include "llvm/ADT/StringSwitch.h"
namespace lld {
namespace moduledef {
Token Lexer::lex() {
_buffer = _buffer.trim();
if (_buffer.empty() || _buffer[0] == '\0')
return Token(Kind::eof, _buffer);
switch (_buffer[0]) {
case '=':
_buffer = _buffer.drop_front();
return Token(Kind::equal, "=");
case ',':
_buffer = _buffer.drop_front();
return Token(Kind::comma, ",");
case '"': {
size_t end = _buffer.find('"', 1);
Token ret;
if (end == _buffer.npos) {
ret = Token(Kind::identifier, _buffer.substr(1, end));
_buffer = "";
} else {
ret = Token(Kind::identifier, _buffer.substr(1, end - 1));
_buffer = _buffer.drop_front(end);
}
return ret;
}
default: {
size_t end = _buffer.find_first_not_of(
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789_.*~+!@#$%^&*()/");
StringRef word = _buffer.substr(0, end);
Kind kind = llvm::StringSwitch<Kind>(word)
.Case("BASE", Kind::kw_base)
.Case("DATA", Kind::kw_data)
.Case("EXPORTS", Kind::kw_exports)
.Case("HEAPSIZE", Kind::kw_heapsize)
.Case("NAME", Kind::kw_name)
.Case("NONAME", Kind::kw_noname)
.Default(Kind::identifier);
_buffer = (end == _buffer.npos) ? "" : _buffer.drop_front(end);
return Token(kind, word);
}
}
}
void Parser::consumeToken() {
if (_tokBuf.empty()) {
_tok = _lex.lex();
return;
}
_tok = _tokBuf.back();
_tokBuf.pop_back();
}
bool Parser::consumeTokenAsInt(uint64_t &result) {
consumeToken();
if (_tok._kind != Kind::identifier) {
ungetToken();
error(_tok, "Integer expected");
return false;
}
if (_tok._range.getAsInteger(10, result)) {
error(_tok, "Integer expected");
return false;
}
return true;
}
bool Parser::expectAndConsume(Kind kind, Twine msg) {
consumeToken();
if (_tok._kind != kind) {
error(_tok, msg);
return false;
}
return true;
}
void Parser::ungetToken() { _tokBuf.push_back(_tok); }
void Parser::error(const Token &tok, Twine msg) {
_lex.getSourceMgr().PrintMessage(
llvm::SMLoc::getFromPointer(tok._range.data()), llvm::SourceMgr::DK_Error,
msg);
}
llvm::Optional<Directive *> Parser::parse() {
consumeToken();
// EXPORTS
if (_tok._kind == Kind::kw_exports) {
std::vector<PECOFFLinkingContext::ExportDesc> exports;
for (;;) {
PECOFFLinkingContext::ExportDesc desc;
if (!parseExport(desc))
break;
exports.push_back(desc);
}
return new (_alloc) Exports(exports);
}
// HEAPSIZE
if (_tok._kind == Kind::kw_heapsize) {
uint64_t reserve, commit;
if (!parseHeapsize(reserve, commit))
return llvm::None;
return new (_alloc) Heapsize(reserve, commit);
}
// NAME
if (_tok._kind == Kind::kw_name) {
std::string outputPath;
uint64_t baseaddr;
if (!parseName(outputPath, baseaddr))
return llvm::None;
return new (_alloc) Name(outputPath, baseaddr);
}
error(_tok, Twine("Unknown directive: ") + _tok._range);
return llvm::None;
}
bool Parser::parseExport(PECOFFLinkingContext::ExportDesc &result) {
consumeToken();
if (_tok._kind != Kind::identifier) {
ungetToken();
return false;
}
result.name = _tok._range;
for (;;) {
consumeToken();
if (_tok._kind == Kind::identifier && _tok._range[0] == '@') {
_tok._range.drop_front().getAsInteger(10, result.ordinal);
consumeToken();
if (_tok._kind == Kind::kw_noname) {
result.noname = true;
} else {
ungetToken();
}
continue;
}
if (_tok._kind == Kind::kw_data) {
result.isData = true;
continue;
}
ungetToken();
return true;
}
}
// HEAPSIZE reserve [, commit]
bool Parser::parseHeapsize(uint64_t &reserve, uint64_t &commit) {
if (!consumeTokenAsInt(reserve))
return false;
consumeToken();
if (_tok._kind != Kind::comma) {
ungetToken();
commit = 0;
return true;
}
if (!consumeTokenAsInt(commit))
return false;
return true;
}
// NAME [outputPath] [BASE=address]
bool Parser::parseName(std::string &outputPath, uint64_t &baseaddr) {
consumeToken();
if (_tok._kind == Kind::identifier) {
outputPath = _tok._range;
consumeToken();
} else {
outputPath = "";
}
if (_tok._kind == Kind::kw_base) {
if (!expectAndConsume(Kind::equal, "'=' expected"))
return false;
if (!consumeTokenAsInt(baseaddr))
return false;
} else {
baseaddr = 0;
}
return true;
}
} // moddef
} // namespace lld
|
