mirror of
https://github.com/zebrajr/pytorch.git
synced 2025-12-07 00:21:07 +01:00
f118568662
Summary: Moves implementation into .cpp file. Parser was getting included in several compilation units. Pull Request resolved: https://github.com/pytorch/pytorch/pull/15238 Differential Revision: D13474635 Pulled By: zdevito fbshipit-source-id: 7dc824eea8f506d6c8ae1aa67aeec0c34d5285fc
532 lines
16 KiB
C++
532 lines
16 KiB
C++
#include <torch/csrc/jit/script/lexer.h>
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#include <torch/csrc/jit/script/tree.h>
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#include <torch/csrc/jit/script/parser.h>
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#include <torch/csrc/jit/script/tree_views.h>
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#include <c10/util/Optional.h>
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#include <torch/csrc/jit/script/parse_string_literal.h>
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namespace torch {
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namespace jit {
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namespace script {
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Decl mergeTypesFromTypeComment(const Decl& decl, const Decl& type_annotation_decl, bool is_method) {
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auto expected_num_annotations = decl.params().size();
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if (is_method) {
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// `self` argument
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expected_num_annotations -= 1;
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}
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if (expected_num_annotations != type_annotation_decl.params().size()) {
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throw ErrorReport(type_annotation_decl.range()) << "Number of type annotations ("
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<< type_annotation_decl.params().size() << ") did not match the number of "
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<< "function parameters (" << expected_num_annotations << ")";
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}
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auto old = decl.params();
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auto _new = type_annotation_decl.params();
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// Merge signature idents and ranges with annotation types
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std::vector<Param> new_params;
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size_t i = is_method ? 1 : 0;
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size_t j = 0;
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if (is_method) {
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new_params.push_back(old[0]);
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}
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for (; i < decl.params().size(); ++i, ++j) {
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new_params.emplace_back(old[i].withType(_new[j].type()));
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}
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return Decl::create(decl.range(), List<Param>::create(decl.range(), new_params), type_annotation_decl.return_type());
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}
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struct ParserImpl {
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explicit ParserImpl(const std::string& str)
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: L(str), shared(sharedParserData()) {}
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Ident parseIdent() {
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auto t = L.expect(TK_IDENT);
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// whenever we parse something that has a TreeView type we always
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// use its create method so that the accessors and the constructor
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// of the Compound tree are in the same place.
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return Ident::create(t.range, t.text());
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}
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TreeRef createApply(const Expr& expr) {
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TreeList attributes;
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auto range = L.cur().range;
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TreeList inputs;
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parseOperatorArguments(inputs, attributes);
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return Apply::create(
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range,
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expr,
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List<Expr>(makeList(range, std::move(inputs))),
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List<Attribute>(makeList(range, std::move(attributes))));
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}
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static bool followsTuple(int kind) {
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switch(kind) {
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case TK_PLUS_EQ:
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case TK_MINUS_EQ:
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case TK_TIMES_EQ:
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case TK_DIV_EQ:
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case TK_NEWLINE:
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case '=':
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case ')':
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return true;
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default:
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return false;
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}
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}
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// exp | expr, | expr, expr, ...
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Expr parseExpOrExpTuple() {
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auto prefix = parseExp();
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if(L.cur().kind == ',') {
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std::vector<Expr> exprs = { prefix };
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while(L.nextIf(',')) {
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if (followsTuple(L.cur().kind))
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break;
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exprs.push_back(parseExp());
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}
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auto list = List<Expr>::create(prefix.range(), exprs);
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prefix = TupleLiteral::create(list.range(), list);
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}
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return prefix;
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}
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// things like a 1.0 or a(4) that are not unary/binary expressions
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// and have higher precedence than all of them
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TreeRef parseBaseExp() {
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TreeRef prefix;
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switch (L.cur().kind) {
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case TK_NUMBER: {
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prefix = parseConst();
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} break;
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case TK_TRUE:
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case TK_FALSE:
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case TK_NONE: {
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auto k = L.cur().kind;
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auto r = L.cur().range;
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prefix = c(k, r, {});
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L.next();
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} break;
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case '(': {
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L.next();
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if (L.nextIf(')')) {
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/// here we have the empty tuple case
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std::vector<Expr> vecExpr;
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List<Expr> listExpr = List<Expr>::create(L.cur().range, vecExpr);
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prefix = TupleLiteral::create(L.cur().range, listExpr);
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break;
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}
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prefix = parseExpOrExpTuple();
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L.expect(')');
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} break;
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case '[': {
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auto list = parseList('[', ',', ']', &ParserImpl::parseExp);
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prefix = ListLiteral::create(list.range(), List<Expr>(list));
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} break;
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case TK_STRINGLITERAL: {
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prefix = parseConcatenatedStringLiterals();
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} break;
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default: {
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Ident name = parseIdent();
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prefix = Var::create(name.range(), name);
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} break;
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}
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while (true) {
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if (L.nextIf('.')) {
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const auto name = parseIdent();
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prefix = Select::create(name.range(), Expr(prefix), Ident(name));
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} else if (L.cur().kind == '(') {
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prefix = createApply(Expr(prefix));
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} else if (L.cur().kind == '[') {
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prefix = parseSubscript(prefix);
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} else {
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break;
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}
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}
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return prefix;
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}
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TreeRef parseAssignmentOp() {
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auto r = L.cur().range;
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switch (L.cur().kind) {
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case TK_PLUS_EQ:
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case TK_MINUS_EQ:
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case TK_TIMES_EQ:
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case TK_DIV_EQ: {
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int modifier = L.next().text()[0];
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return c(modifier, r, {});
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} break;
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default: {
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L.expect('=');
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return c('=', r, {}); // no reduction
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} break;
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}
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}
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TreeRef
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parseTrinary(TreeRef true_branch, const SourceRange& range, int binary_prec) {
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auto cond = parseExp();
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L.expect(TK_ELSE);
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auto false_branch = parseExp(binary_prec);
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return c(TK_IF_EXPR, range, {cond, std::move(true_branch), false_branch});
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}
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// parse the longest expression whose binary operators have
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// precedence strictly greater than 'precedence'
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// precedence == 0 will parse _all_ expressions
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// this is the core loop of 'top-down precedence parsing'
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Expr parseExp() { return parseExp(0); }
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Expr parseExp(int precedence) {
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TreeRef prefix = nullptr;
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int unary_prec;
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if (shared.isUnary(L.cur().kind, &unary_prec)) {
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auto kind = L.cur().kind;
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auto pos = L.cur().range;
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L.next();
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auto unary_kind = kind == '*' ? TK_STARRED :
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kind == '-' ? TK_UNARY_MINUS :
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kind;
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auto subexp = parseExp(unary_prec);
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// fold '-' into constant numbers, so that attributes can accept
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// things like -1
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if(unary_kind == TK_UNARY_MINUS && subexp.kind() == TK_CONST) {
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prefix = Const::create(subexp.range(), "-" + Const(subexp).text());
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} else {
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prefix = c(unary_kind, pos, {subexp});
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}
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} else {
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prefix = parseBaseExp();
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}
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int binary_prec;
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while (shared.isBinary(L.cur().kind, &binary_prec)) {
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if (binary_prec <= precedence) // not allowed to parse something which is
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// not greater than 'precedence'
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break;
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int kind = L.cur().kind;
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auto pos = L.cur().range;
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L.next();
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if (shared.isRightAssociative(kind))
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binary_prec--;
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// special case for trinary operator
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if (kind == TK_IF) {
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prefix = parseTrinary(prefix, pos, binary_prec);
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continue;
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}
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prefix = c(kind, pos, {prefix, parseExp(binary_prec)});
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}
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return Expr(prefix);
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}
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template<typename T>
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List<T> parseList(int begin, int sep, int end, T (ParserImpl::*parse)()) {
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auto r = L.cur().range;
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if (begin != TK_NOTHING)
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L.expect(begin);
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std::vector<T> elements;
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if (L.cur().kind != end) {
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do {
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elements.push_back((this->*parse)());
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} while (L.nextIf(sep));
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}
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if (end != TK_NOTHING)
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L.expect(end);
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return List<T>::create(r, elements);
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}
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Const parseConst() {
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auto range = L.cur().range;
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auto t = L.expect(TK_NUMBER);
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return Const::create(t.range, t.text());
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}
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StringLiteral parseConcatenatedStringLiterals() {
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auto range = L.cur().range;
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std::stringstream ss;
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while(L.cur().kind == TK_STRINGLITERAL) {
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auto literal_range = L.cur().range;
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ss << parseStringLiteral(literal_range, L.next().text());
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}
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return StringLiteral::create(range, ss.str());
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}
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Expr parseAttributeValue() {
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return parseExp();
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}
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void parseOperatorArguments(TreeList& inputs, TreeList& attributes) {
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L.expect('(');
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if (L.cur().kind != ')') {
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do {
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if (L.cur().kind == TK_IDENT && L.lookahead().kind == '=') {
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auto ident = parseIdent();
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L.expect('=');
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auto v = parseAttributeValue();
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attributes.push_back(Attribute::create(ident.range(), Ident(ident), v));
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} else {
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inputs.push_back(parseExp());
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}
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} while (L.nextIf(','));
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}
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L.expect(')');
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}
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// Parse expr's of the form [a:], [:b], [a:b], [:]
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Expr parseSubscriptExp() {
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TreeRef first, second;
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auto range = L.cur().range;
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if (L.cur().kind != ':') {
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first = parseExp();
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}
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if (L.nextIf(':')) {
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if (L.cur().kind != ',' && L.cur().kind != ']') {
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second = parseExp();
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}
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auto maybe_first = first ? Maybe<Expr>::create(range, Expr(first)) : Maybe<Expr>::create(range);
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auto maybe_second = second ? Maybe<Expr>::create(range, Expr(second)) : Maybe<Expr>::create(range);
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return SliceExpr::create(range, maybe_first, maybe_second);
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} else {
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return Expr(first);
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}
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}
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TreeRef parseSubscript(const TreeRef& value) {
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const auto range = L.cur().range;
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auto subscript_exprs = parseList('[', ',', ']', &ParserImpl::parseSubscriptExp);
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return Subscript::create(range, Expr(value), subscript_exprs);
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}
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TreeRef parseParam() {
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auto ident = parseIdent();
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TreeRef type;
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if (L.nextIf(':')) {
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type = parseExp();
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} else {
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type = Var::create(L.cur().range, Ident::create(L.cur().range, "Tensor"));
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}
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TreeRef def;
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if (L.nextIf('=')) {
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def = Maybe<Expr>::create(L.cur().range, parseExp());
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} else {
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def = Maybe<Expr>::create(L.cur().range);
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}
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return Param::create(type->range(), Ident(ident), Expr(type), Maybe<Expr>(def));
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}
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Param parseBareTypeAnnotation() {
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auto type = parseExp();
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return Param::create(type.range(), Ident::create(type.range(), ""), type, Maybe<Expr>::create(type.range()));
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}
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Decl parseTypeComment() {
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auto range = L.cur().range;
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L.expect(TK_TYPE_COMMENT);
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auto param_types = parseList('(', ',', ')', &ParserImpl::parseBareTypeAnnotation);
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TreeRef return_type;
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if (L.nextIf(TK_ARROW)) {
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auto return_type_range = L.cur().range;
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return_type = Maybe<Expr>::create(return_type_range, parseExp());
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} else {
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return_type = Maybe<Expr>::create(L.cur().range);
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}
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return Decl::create(range, param_types, Maybe<Expr>(return_type));
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}
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// 'first' has already been parsed since expressions can exist
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// alone on a line:
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// first[,other,lhs] = rhs
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TreeRef parseAssign(const Expr& lhs) {
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auto op = parseAssignmentOp();
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auto rhs = parseExpOrExpTuple();
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L.expect(TK_NEWLINE);
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if (op->kind() == '=') {
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return Assign::create(lhs.range(), lhs, Expr(rhs));
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} else {
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// this is an augmented assignment
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if (lhs.kind() == TK_TUPLE_LITERAL) {
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throw ErrorReport(lhs.range())
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<< " augmented assignment can only have one LHS expression";
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}
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return AugAssign::create(
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lhs.range(), lhs, AugAssignKind(op), Expr(rhs));
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}
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}
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TreeRef parseStmt() {
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switch (L.cur().kind) {
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case TK_IF:
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return parseIf();
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case TK_WHILE:
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return parseWhile();
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case TK_FOR:
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return parseFor();
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case TK_GLOBAL: {
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auto range = L.next().range;
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auto idents = parseList(TK_NOTHING, ',', TK_NOTHING, &ParserImpl::parseIdent);
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L.expect(TK_NEWLINE);
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return Global::create(range, idents);
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}
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case TK_RETURN: {
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auto range = L.next().range;
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// XXX: TK_NEWLINE makes it accept an empty list
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auto values = parseList(TK_NOTHING, ',', TK_NEWLINE, &ParserImpl::parseExp);
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return Return::create(range, values);
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}
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case TK_RAISE: {
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auto range = L.next().range;
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auto expr = parseExp();
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L.expect(TK_NEWLINE);
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return Raise::create(range, expr);
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}
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case TK_ASSERT: {
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auto range = L.next().range;
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auto cond = parseExp();
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Maybe<Expr> maybe_first = Maybe<Expr>::create(range);
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if (L.nextIf(',')) {
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auto msg = parseExp();
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maybe_first = Maybe<Expr>::create(range, Expr(msg));
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}
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L.expect(TK_NEWLINE);
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return Assert::create(range, cond, maybe_first);
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}
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case TK_PASS: {
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auto range = L.next().range;
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L.expect(TK_NEWLINE);
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return Pass::create(range);
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}
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default: {
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auto lhs = parseExpOrExpTuple();
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if (L.cur().kind != TK_NEWLINE) {
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return parseAssign(lhs);
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} else {
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L.expect(TK_NEWLINE);
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return ExprStmt::create(lhs.range(), lhs);
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}
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}
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}
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}
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TreeRef parseOptionalIdentList() {
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TreeRef list = nullptr;
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if (L.cur().kind == '(') {
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list = parseList('(', ',', ')', &ParserImpl::parseIdent);
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} else {
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list = c(TK_LIST, L.cur().range, {});
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}
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return list;
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}
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TreeRef parseIf(bool expect_if=true) {
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auto r = L.cur().range;
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if (expect_if)
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L.expect(TK_IF);
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auto cond = parseExp();
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L.expect(':');
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auto true_branch = parseStatements();
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auto false_branch = makeList(L.cur().range, {});
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if (L.nextIf(TK_ELSE)) {
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L.expect(':');
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false_branch = parseStatements();
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} else if (L.nextIf(TK_ELIF)) {
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// NB: this needs to be a separate statement, since the call to parseIf
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// mutates the lexer state, and thus causes a heap-use-after-free in
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// compilers which evaluate argument expressions LTR
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auto range = L.cur().range;
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false_branch = makeList(range, {parseIf(false)});
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}
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return If::create(r, Expr(cond), List<Stmt>(true_branch), List<Stmt>(false_branch));
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}
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TreeRef parseWhile() {
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auto r = L.cur().range;
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L.expect(TK_WHILE);
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auto cond = parseExp();
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L.expect(':');
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auto body = parseStatements();
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return While::create(r, Expr(cond), List<Stmt>(body));
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}
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TreeRef parseFor() {
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auto r = L.cur().range;
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L.expect(TK_FOR);
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auto targets = parseList(TK_NOTHING, ',', TK_NOTHING, &ParserImpl::parseExp);
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L.expect(TK_IN);
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auto itrs = parseList(TK_NOTHING, ',', TK_NOTHING, &ParserImpl::parseExp);
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L.expect(':');
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auto body = parseStatements();
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return For::create(r, targets, itrs, body);
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}
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TreeRef parseStatements(bool expect_indent=true) {
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auto r = L.cur().range;
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if (expect_indent) {
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L.expect(TK_INDENT);
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}
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TreeList stmts;
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do {
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stmts.push_back(parseStmt());
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} while(!L.nextIf(TK_DEDENT));
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return c(TK_LIST, r, std::move(stmts));
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}
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Decl parseDecl() {
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auto paramlist = parseList('(', ',', ')', &ParserImpl::parseParam);
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// Parse return type annotation
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TreeRef return_type;
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if (L.nextIf(TK_ARROW)) {
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// Exactly one expression for return type annotation
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auto return_type_range = L.cur().range;
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return_type = Maybe<Expr>::create(return_type_range, parseExp());
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} else {
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// Default to returning single tensor. TODO: better sentinel value?
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return_type = Maybe<Expr>::create(L.cur().range);
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}
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L.expect(':');
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return Decl::create(paramlist.range(), List<Param>(paramlist), Maybe<Expr>(return_type));
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}
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TreeRef parseFunction(bool is_method) {
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L.expect(TK_DEF);
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auto name = parseIdent();
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auto decl = parseDecl();
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// Handle type annotations specified in a type comment as the first line of
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// the function.
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L.expect(TK_INDENT);
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if (L.cur().kind == TK_TYPE_COMMENT) {
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auto type_annotation_decl = Decl(parseTypeComment());
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L.expect(TK_NEWLINE);
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decl = mergeTypesFromTypeComment(decl, type_annotation_decl, is_method);
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}
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|
|
auto stmts_list = parseStatements(false);
|
|
return Def::create(name.range(), Ident(name), Decl(decl),
|
|
List<Stmt>(stmts_list));
|
|
}
|
|
Lexer& lexer() {
|
|
return L;
|
|
}
|
|
|
|
private:
|
|
// short helpers to create nodes
|
|
TreeRef c(int kind, const SourceRange& range, TreeList&& trees) {
|
|
return Compound::create(kind, range, std::move(trees));
|
|
}
|
|
TreeRef makeList(const SourceRange& range, TreeList&& trees) {
|
|
return c(TK_LIST, range, std::move(trees));
|
|
}
|
|
Lexer L;
|
|
SharedParserData& shared;
|
|
};
|
|
|
|
Parser::Parser(const std::string& src)
|
|
: pImpl(new ParserImpl(src)) {}
|
|
|
|
Parser::~Parser() = default;
|
|
|
|
TreeRef Parser::parseFunction(bool is_method) {
|
|
return pImpl->parseFunction(is_method);
|
|
}
|
|
Lexer& Parser::lexer() {
|
|
return pImpl->lexer();
|
|
}
|
|
Decl Parser::parseTypeComment() {
|
|
return pImpl->parseTypeComment();
|
|
}
|
|
|
|
} // namespace script
|
|
} // namespace jit
|
|
} // namespace torch
|