fa3d789df1
Refactor of the llvm-tblgen source into: - a "Basic" library, which contains the bare minimum utilities to build `llvm-min-tablegen` - a "Common" library which contains all of the helpers for TableGen backends. Such helpers can be shared by more than one backend, and even unit tested (e.g. CodeExpander is, maybe we can add more over time) Fixes #80647
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
//===- CodeExpander.cpp - Expand variables in a string --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file Expand the variables in a string.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeExpander.h"
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#include "CodeExpansions.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TableGen/Error.h"
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using namespace llvm;
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void CodeExpander::emit(raw_ostream &OS) const {
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StringRef Current = Code;
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while (!Current.empty()) {
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size_t Pos = Current.find_first_of("$\n\\");
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if (Pos == StringRef::npos) {
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OS << Current;
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Current = "";
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continue;
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}
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OS << Current.substr(0, Pos);
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Current = Current.substr(Pos);
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if (Current.consume_front("\n")) {
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OS << "\n" << Indent;
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continue;
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}
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if (Current.starts_with("\\$") || Current.starts_with("\\\\")) {
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OS << Current[1];
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Current = Current.drop_front(2);
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continue;
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}
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if (Current.consume_front("\\"))
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continue;
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if (Current.starts_with("${")) {
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StringRef StartVar = Current;
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Current = Current.drop_front(2);
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StringRef Var;
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std::tie(Var, Current) = Current.split("}");
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// Warn if we split because no terminator was found.
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StringRef EndVar = StartVar.drop_front(2 /* ${ */ + Var.size());
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if (EndVar.empty()) {
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PrintWarning(Loc, "Unterminated expansion '${" + Var + "'");
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PrintNote("Code: [{" + Code + "}]");
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}
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auto ValueI = Expansions.find(Var);
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if (ValueI == Expansions.end()) {
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PrintError(Loc,
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"Attempt to expand an undeclared variable '" + Var + "'");
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PrintNote("Code: [{" + Code + "}]");
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}
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if (ShowExpansions)
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OS << "/*$" << Var << "{*/";
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OS << Expansions.lookup(Var);
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if (ShowExpansions)
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OS << "/*}*/";
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continue;
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}
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PrintWarning(Loc, "Assuming missing escape character: \\$");
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PrintNote("Code: [{" + Code + "}]");
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OS << "$";
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Current = Current.drop_front(1);
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}
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}
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