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//===--- ParseBridging.cpp ------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Parse/ParseBridging.h"
#include "swift/Bridging/ASTGen.h"
#include "swift/Parse/Parser.h"
using namespace swift;
// MARK: Functions called from SwiftParser.
BridgedExpr BridgedLegacyParser_parseExpr(BridgedLegacyParser p,
BridgedSourceLoc loc,
BridgedDeclContext DC,
bool isExprBasic) {
auto &P = p.unbridged();
auto PP =
P.getParserPosition(loc.unbridged(), /*PreviousLoc=*/loc.unbridged());
P.CurDeclContext = DC.unbridged();
P.restoreParserPosition(PP);
// Since `SequenceExpr` is implemented in ASTGen, it only delegates sequence
// elements parsing.
ParserResult<Expr> result =
P.parseExprSequenceElement(diag::expected_expr, isExprBasic);
return result.getPtrOrNull();
}
BridgedDecl BridgedLegacyParser_parseDecl(BridgedLegacyParser p,
BridgedSourceLoc loc,
BridgedDeclContext DC) {
auto &P = p.unbridged();
auto PP =
P.getParserPosition(loc.unbridged(), /*PreviousLoc=*/loc.unbridged());
P.CurDeclContext = DC.unbridged();
P.restoreParserPosition(PP);
// FIXME: IsAtStartOfLineOrPreviousHadSemi should be passed in from ASTGen.
// IfConfigsAreDeclAttrs: true because ASTGen thinks the current location is
// a start of a decl.
ParserResult<Decl> result = P.parseDecl(
/*IsAtStartOfLineOrPreviousHadSemi=*/true,
/*IfConfigsAreDeclAttrs=*/true, [&](Decl *decl) {},
/*fromASTGen=*/true);
return result.getPtrOrNull();
}
BridgedStmt BridgedLegacyParser_parseStmt(BridgedLegacyParser p,
BridgedSourceLoc loc,
BridgedDeclContext DC) {
auto &P = p.unbridged();
auto PP =
P.getParserPosition(loc.unbridged(), /*PreviousLoc=*/loc.unbridged());
P.CurDeclContext = DC.unbridged();
P.restoreParserPosition(PP);
ParserResult<Stmt> result = P.parseStmt(/*fromASTGen=*/true);
return result.getPtrOrNull();
}
BridgedTypeRepr BridgedLegacyParser_parseType(BridgedLegacyParser p,
BridgedSourceLoc loc,
BridgedDeclContext DC) {
auto &P = p.unbridged();
auto PP =
P.getParserPosition(loc.unbridged(), /*PreviousLoc=*/loc.unbridged());
P.CurDeclContext = DC.unbridged();
P.restoreParserPosition(PP);
// FIXME: Calculate 'ParseTypeReason' in ASTGen.
ParserResult<TypeRepr> result =
P.parseType(diag::expected_type, Parser::ParseTypeReason::Unspecified,
/*fromASTGen=*/true);
return result.getPtrOrNull();
}
// MARK: Functions called from C++ parser.
/// Callback function used for creating a C++ AST from the syntax node at the
/// given source location.
///
/// The arguments to this callback are the source file to pass into ASTGen (the
/// exported source file) and the source location pointer to pass into ASTGen
/// (to find the syntax node).
///
/// The callback returns the new AST node and the ending location of the syntax
/// node. If the AST node is NULL, something went wrong.
template <typename T>
using ASTFromSyntaxTreeCallback = T *(void *sourceFile,
BridgedSourceLoc sourceLoc,
BridgedSourceLoc &endLoc);
#if SWIFT_BUILD_SWIFT_SYNTAX
/// Parse by constructing a C++ AST node from the Swift syntax tree via ASTGen.
template <typename T>
static ParserResult<T>
parseASTFromSyntaxTree(swift::Parser &P,
llvm::function_ref<ASTFromSyntaxTreeCallback<T>> body) {
assert(P.IsForASTGen);
auto exportedSourceFile = P.SF.getExportedSourceFile();
if (!exportedSourceFile)
return nullptr;
// Perform the translation.
BridgedSourceLoc endLoc;
T *astNode = body(exportedSourceFile, P.Tok.getLoc(), endLoc);
if (!astNode) {
assert(false && "Could not build AST node from syntax tree");
return nullptr;
}
// Reset the lexer to the ending location.
auto endOffset =
P.SourceMgr.getLocOffsetInBuffer(endLoc.unbridged(), P.L->getBufferID());
P.L->resetToOffset(endOffset);
P.consumeTokenWithoutFeedingReceiver();
return makeParserResult(astNode);
}
#endif
ParserResult<TypeRepr> Parser::parseTypeReprFromSyntaxTree() {
#if SWIFT_BUILD_SWIFT_SYNTAX
return parseASTFromSyntaxTree<TypeRepr>(*this, [&](void *exportedSourceFile,
BridgedSourceLoc sourceLoc,
BridgedSourceLoc &endLoc) {
return swift_ASTGen_buildTypeRepr(&Diags, exportedSourceFile, sourceLoc,
CurDeclContext, Context, *this, &endLoc);
});
#else
llvm_unreachable("ASTGen is not supported");
#endif
}
ParserResult<Decl> Parser::parseDeclFromSyntaxTree() {
#if SWIFT_BUILD_SWIFT_SYNTAX
return parseASTFromSyntaxTree<Decl>(*this, [&](void *exportedSourceFile,
BridgedSourceLoc sourceLoc,
BridgedSourceLoc &endLoc) {
return swift_ASTGen_buildDecl(&Diags, exportedSourceFile, sourceLoc,
CurDeclContext, Context, *this, &endLoc);
});
#else
llvm_unreachable("ASTGen is not supported");
#endif
}
ParserResult<Expr> Parser::parseExprFromSyntaxTree() {
#if SWIFT_BUILD_SWIFT_SYNTAX
return parseASTFromSyntaxTree<Expr>(*this, [&](void *exportedSourceFile,
BridgedSourceLoc sourceLoc,
BridgedSourceLoc &endLoc) {
return swift_ASTGen_buildExpr(&Diags, exportedSourceFile, sourceLoc,
CurDeclContext, Context, *this, &endLoc);
});
#else
llvm_unreachable("ASTGen is not supported");
#endif
}
ParserResult<Stmt> Parser::parseStmtFromSyntaxTree() {
#if SWIFT_BUILD_SWIFT_SYNTAX
return parseASTFromSyntaxTree<Stmt>(*this, [&](void *exportedSourceFile,
BridgedSourceLoc sourceLoc,
BridgedSourceLoc &endLoc) {
return swift_ASTGen_buildStmt(&Diags, exportedSourceFile, sourceLoc,
CurDeclContext, Context, *this, &endLoc);
});
#else
llvm_unreachable("ASTGen is not supported");
#endif
}
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