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Diffstat (limited to 'src/dyndep_parser.cc')
| -rw-r--r-- | src/dyndep_parser.cc | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/dyndep_parser.cc b/src/dyndep_parser.cc new file mode 100644 index 0000000..baebbac --- /dev/null +++ b/src/dyndep_parser.cc @@ -0,0 +1,223 @@ +// Copyright 2015 Google Inc. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "dyndep_parser.h" + +#include <vector> + +#include "dyndep.h" +#include "graph.h" +#include "state.h" +#include "util.h" +#include "version.h" + +DyndepParser::DyndepParser(State* state, FileReader* file_reader, + DyndepFile* dyndep_file) + : Parser(state, file_reader) + , dyndep_file_(dyndep_file) { +} + +bool DyndepParser::Parse(const string& filename, const string& input, + string* err) { + lexer_.Start(filename, input); + + // Require a supported ninja_dyndep_version value immediately so + // we can exit before encountering any syntactic surprises. + bool haveDyndepVersion = false; + + for (;;) { + Lexer::Token token = lexer_.ReadToken(); + switch (token) { + case Lexer::BUILD: { + if (!haveDyndepVersion) + return lexer_.Error("expected 'ninja_dyndep_version = ...'", err); + if (!ParseEdge(err)) + return false; + break; + } + case Lexer::IDENT: { + lexer_.UnreadToken(); + if (haveDyndepVersion) + return lexer_.Error(string("unexpected ") + Lexer::TokenName(token), + err); + if (!ParseDyndepVersion(err)) + return false; + haveDyndepVersion = true; + break; + } + case Lexer::ERROR: + return lexer_.Error(lexer_.DescribeLastError(), err); + case Lexer::TEOF: + if (!haveDyndepVersion) + return lexer_.Error("expected 'ninja_dyndep_version = ...'", err); + return true; + case Lexer::NEWLINE: + break; + default: + return lexer_.Error(string("unexpected ") + Lexer::TokenName(token), + err); + } + } + return false; // not reached +} + +bool DyndepParser::ParseDyndepVersion(string* err) { + string name; + EvalString let_value; + if (!ParseLet(&name, &let_value, err)) + return false; + if (name != "ninja_dyndep_version") { + return lexer_.Error("expected 'ninja_dyndep_version = ...'", err); + } + string version = let_value.Evaluate(&env_); + int major, minor; + ParseVersion(version, &major, &minor); + if (major != 1 || minor != 0) { + return lexer_.Error( + string("unsupported 'ninja_dyndep_version = ") + version + "'", err); + return false; + } + return true; +} + +bool DyndepParser::ParseLet(string* key, EvalString* value, string* err) { + if (!lexer_.ReadIdent(key)) + return lexer_.Error("expected variable name", err); + if (!ExpectToken(Lexer::EQUALS, err)) + return false; + if (!lexer_.ReadVarValue(value, err)) + return false; + return true; +} + +bool DyndepParser::ParseEdge(string* err) { + // Parse one explicit output. We expect it to already have an edge. + // We will record its dynamically-discovered dependency information. + Dyndeps* dyndeps = NULL; + { + EvalString out0; + if (!lexer_.ReadPath(&out0, err)) + return false; + if (out0.empty()) + return lexer_.Error("expected path", err); + + string path = out0.Evaluate(&env_); + string path_err; + uint64_t slash_bits; + if (!CanonicalizePath(&path, &slash_bits, &path_err)) + return lexer_.Error(path_err, err); + Node* node = state_->LookupNode(path); + if (!node || !node->in_edge()) + return lexer_.Error("no build statement exists for '" + path + "'", err); + Edge* edge = node->in_edge(); + std::pair<DyndepFile::iterator, bool> res = + dyndep_file_->insert(DyndepFile::value_type(edge, Dyndeps())); + if (!res.second) + return lexer_.Error("multiple statements for '" + path + "'", err); + dyndeps = &res.first->second; + } + + // Disallow explicit outputs. + { + EvalString out; + if (!lexer_.ReadPath(&out, err)) + return false; + if (!out.empty()) + return lexer_.Error("explicit outputs not supported", err); + } + + // Parse implicit outputs, if any. + vector<EvalString> outs; + if (lexer_.PeekToken(Lexer::PIPE)) { + for (;;) { + EvalString out; + if (!lexer_.ReadPath(&out, err)) + return err; + if (out.empty()) + break; + outs.push_back(out); + } + } + + if (!ExpectToken(Lexer::COLON, err)) + return false; + + string rule_name; + if (!lexer_.ReadIdent(&rule_name) || rule_name != "dyndep") + return lexer_.Error("expected build command name 'dyndep'", err); + + // Disallow explicit inputs. + { + EvalString in; + if (!lexer_.ReadPath(&in, err)) + return false; + if (!in.empty()) + return lexer_.Error("explicit inputs not supported", err); + } + + // Parse implicit inputs, if any. + vector<EvalString> ins; + if (lexer_.PeekToken(Lexer::PIPE)) { + for (;;) { + EvalString in; + if (!lexer_.ReadPath(&in, err)) + return err; + if (in.empty()) + break; + ins.push_back(in); + } + } + + // Disallow order-only inputs. + if (lexer_.PeekToken(Lexer::PIPE2)) + return lexer_.Error("order-only inputs not supported", err); + + if (!ExpectToken(Lexer::NEWLINE, err)) + return false; + + if (lexer_.PeekToken(Lexer::INDENT)) { + string key; + EvalString val; + if (!ParseLet(&key, &val, err)) + return false; + if (key != "restat") + return lexer_.Error("binding is not 'restat'", err); + string value = val.Evaluate(&env_); + dyndeps->restat_ = !value.empty(); + } + + dyndeps->implicit_inputs_.reserve(ins.size()); + for (vector<EvalString>::iterator i = ins.begin(); i != ins.end(); ++i) { + string path = i->Evaluate(&env_); + string path_err; + uint64_t slash_bits; + if (!CanonicalizePath(&path, &slash_bits, &path_err)) + return lexer_.Error(path_err, err); + Node* n = state_->GetNode(path, slash_bits); + dyndeps->implicit_inputs_.push_back(n); + } + + dyndeps->implicit_outputs_.reserve(outs.size()); + for (vector<EvalString>::iterator i = outs.begin(); i != outs.end(); ++i) { + string path = i->Evaluate(&env_); + string path_err; + uint64_t slash_bits; + if (!CanonicalizePath(&path, &slash_bits, &path_err)) + return lexer_.Error(path_err, err); + Node* n = state_->GetNode(path, slash_bits); + dyndeps->implicit_outputs_.push_back(n); + } + + return true; +} |