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// SPDX-License-Identifier: GPL-3.0-or-later
#include "MIRMetadataTextParser.h"
#include "MIRParserUtilities.h"
#include "rcc/MIR/MIDebugSyntax.h"
#include <cstdint>
#include <limits>
#include <optional>
#include <string>
#include <string_view>
#include <unordered_set>
#include <utility>
#include <vector>
namespace rcc::mir {
using parser_detail::parseSigned;
using parser_detail::parseUnsigned;
using parser_detail::parseUnsigned32;
Expected<void> MetadataTextParser::expect(MITokenKind Kind, std::string_view Description) {
if (consume(Kind))
return {};
return makeUnexpected(ErrorCode::ParseError,
"expected " + std::string(Description) + " in MIR metadata scalar");
}
Expected<void> MetadataTextParser::finish() {
while (consume(MITokenKind::Newline)) {
}
if (Lexer.failed()) {
if (!Lexer.diagnostics().empty()) {
return makeUnexpected(ErrorCode::ParseError,
std::string(Lexer.diagnostics().front().Message));
}
return makeUnexpected(ErrorCode::ParseError, "invalid MIR metadata scalar");
}
if (!at(MITokenKind::EndOfFile))
return makeUnexpected(ErrorCode::ParseError, "unexpected trailing MIR metadata tokens");
return {};
}
Expected<MachineMetadataReference> MetadataTextParser::parseReference() {
if (auto Exclaim = expect(MITokenKind::Exclaim, "'!' before a metadata slot"); !Exclaim)
return std::unexpected(Exclaim.error());
if (!at(MITokenKind::IntegerLiteral))
return makeUnexpected(ErrorCode::ParseError, "expected a 32-bit metadata slot");
std::uint32_t Slot = 0;
if (!parseUnsigned32(token().integerValue(), Slot))
return makeUnexpected(ErrorCode::ParseError, "metadata slot is outside the 32-bit range");
advance();
return Resolve(Slot);
}
Expected<MachineMetadataReference> MetadataTextParser::parseReferenceOnly() {
auto Reference = parseReference();
if (!Reference)
return std::unexpected(Reference.error());
if (auto Finished = finish(); !Finished)
return std::unexpected(Finished.error());
return Reference;
}
Expected<MachineDIExpression> MetadataTextParser::parseExpression() {
if (!at(MITokenKind::MetadataKeyword) || !token().isMetadataKeyword("!DIExpression")) {
return makeUnexpected(ErrorCode::ParseError, "expected an inline !DIExpression");
}
advance();
if (auto Left = expect(MITokenKind::LeftParen, "'(' after !DIExpression"); !Left)
return std::unexpected(Left.error());
std::vector<std::uint64_t> Elements;
while (!at(MITokenKind::RightParen)) {
if (at(MITokenKind::Identifier)) {
const auto Opcode = parseDIExpressionOpcodeName(token().stringValue());
if (!Opcode) {
return makeUnexpected(ErrorCode::ParseError, "unknown DIExpression opcode '" +
std::string(token().stringValue()) + "'");
}
Elements.push_back(*Opcode);
advance();
} else if (at(MITokenKind::IntegerLiteral)) {
std::int64_t Signed = 0;
std::uint64_t Unsigned = 0;
if (parseSigned(token().integerValue(), Signed))
Elements.push_back(static_cast<std::uint64_t>(Signed));
else if (parseUnsigned(token().integerValue(), Unsigned))
Elements.push_back(Unsigned);
else
return makeUnexpected(ErrorCode::ParseError, "DIExpression integer exceeds 64 bits");
advance();
} else {
return makeUnexpected(ErrorCode::ParseError, "expected a DIExpression opcode or integer");
}
if (!consume(MITokenKind::Comma))
break;
}
if (auto Right = expect(MITokenKind::RightParen, "')' after !DIExpression"); !Right)
return std::unexpected(Right.error());
return MachineDIExpression(std::move(Elements));
}
Expected<MachineMetadataValue> MetadataTextParser::parseValue() {
MachineMetadataValue Value;
if (at(MITokenKind::Exclaim)) {
auto Reference = parseReference();
if (!Reference)
return std::unexpected(Reference.error());
auto Created = MachineMetadataValue::reference(*Reference);
if (!Created)
return std::unexpected(Created.error());
Value = std::move(*Created);
} else {
auto Expression = parseExpression();
if (!Expression)
return std::unexpected(Expression.error());
Value = MachineMetadataValue::expression(std::move(*Expression));
}
if (auto Finished = finish(); !Finished)
return std::unexpected(Finished.error());
return Value;
}
Expected<void>
MetadataTextParser::parseDILocation(std::vector<MachineDILocationFrame> &Frames,
std::optional<MachineMetadataReference> &Terminal) {
if (!at(MITokenKind::MetadataKeyword) || !token().isMetadataKeyword("!DILocation")) {
return makeUnexpected(ErrorCode::ParseError, "expected an inline !DILocation");
}
advance();
if (auto Left = expect(MITokenKind::LeftParen, "'(' after !DILocation"); !Left)
return Left;
MachineDILocationFrame Frame;
bool HasLine = false;
bool HasScope = false;
std::vector<MachineDILocationFrame> NestedFrames;
std::optional<MachineMetadataReference> NestedTerminal;
std::unordered_set<std::string> Seen;
while (!at(MITokenKind::RightParen)) {
if (!at(MITokenKind::Identifier))
return makeUnexpected(ErrorCode::ParseError, "expected a DILocation field name");
const std::string Field(token().stringValue());
if (!Seen.insert(Field).second) {
return makeUnexpected(ErrorCode::ParseError, "duplicate DILocation field '" + Field + "'");
}
advance();
if (auto Colon = expect(MITokenKind::Colon, "':' after a DILocation field"); !Colon)
return Colon;
if (Field == "line") {
std::uint32_t Value = 0;
if (!at(MITokenKind::IntegerLiteral) || !parseUnsigned32(token().integerValue(), Value)) {
return makeUnexpected(ErrorCode::ParseError,
"DILocation line must be an unsigned 32-bit integer");
}
Frame.Line = Value;
HasLine = true;
advance();
} else if (Field == "column") {
std::uint64_t Value = 0;
if (!at(MITokenKind::IntegerLiteral) || !parseUnsigned(token().integerValue(), Value) ||
Value > std::numeric_limits<std::uint16_t>::max()) {
return makeUnexpected(ErrorCode::ParseError,
"DILocation column must be an unsigned 16-bit integer");
}
Frame.Column = static_cast<std::uint16_t>(Value);
advance();
} else if (Field == "scope") {
auto Scope = parseReference();
if (!Scope)
return std::unexpected(Scope.error());
if (Scope->scope() != MachineMetadataScope::EmbeddedIR) {
return makeUnexpected(ErrorCode::ParseError,
"DILocation scope must reference embedded LLVM IR metadata");
}
Frame.Scope = *Scope;
HasScope = true;
} else if (Field == "inlinedAt") {
if (at(MITokenKind::MetadataKeyword) && token().isMetadataKeyword("!DILocation")) {
if (auto Nested = parseDILocation(NestedFrames, NestedTerminal); !Nested)
return Nested;
} else {
auto Reference = parseReference();
if (!Reference)
return std::unexpected(Reference.error());
if (Reference->scope() != MachineMetadataScope::EmbeddedIR) {
return makeUnexpected(ErrorCode::ParseError,
"DILocation inlinedAt must reference embedded LLVM IR metadata");
}
NestedTerminal = *Reference;
}
} else if (Field == "isImplicitCode") {
if (!at(MITokenKind::Identifier) ||
(token().stringValue() != "true" && token().stringValue() != "false")) {
return makeUnexpected(ErrorCode::ParseError,
"DILocation isImplicitCode must be true or false");
}
Frame.IsImplicitCode = token().stringValue() == "true";
advance();
} else if (Field == "atomGroup") {
std::uint64_t Value = 0;
if (!at(MITokenKind::IntegerLiteral) || !parseUnsigned(token().integerValue(), Value) ||
Value > MachineDILocation::MaxAtomGroup) {
return makeUnexpected(ErrorCode::ParseError, "DILocation atomGroup exceeds 61 bits");
}
Frame.AtomGroup = Value;
advance();
} else if (Field == "atomRank") {
std::uint64_t Value = 0;
if (!at(MITokenKind::IntegerLiteral) || !parseUnsigned(token().integerValue(), Value) ||
Value > 7) {
return makeUnexpected(ErrorCode::ParseError, "DILocation atomRank exceeds three bits");
}
Frame.AtomRank = static_cast<std::uint8_t>(Value);
advance();
} else {
return makeUnexpected(ErrorCode::ParseError, "unknown DILocation field '" + Field + "'");
}
if (!consume(MITokenKind::Comma))
break;
}
if (auto Right = expect(MITokenKind::RightParen, "')' after !DILocation"); !Right)
return Right;
if (!HasLine || !HasScope)
return makeUnexpected(ErrorCode::ParseError, "DILocation requires line and scope fields");
Frames.push_back(Frame);
Frames.insert(Frames.end(), NestedFrames.begin(), NestedFrames.end());
Terminal = NestedTerminal;
return {};
}
Expected<MachineDebugLocation> MetadataTextParser::parseLocation() {
MachineDebugLocation Location;
if (at(MITokenKind::Exclaim)) {
auto Reference = parseReference();
if (!Reference)
return std::unexpected(Reference.error());
auto Created = MachineDebugLocation::reference(*Reference);
if (!Created)
return std::unexpected(Created.error());
Location = std::move(*Created);
} else {
std::vector<MachineDILocationFrame> Frames;
std::optional<MachineMetadataReference> Terminal;
if (auto Parsed = parseDILocation(Frames, Terminal); !Parsed)
return std::unexpected(Parsed.error());
auto Created = MachineDILocation::create(std::move(Frames), Terminal);
if (!Created)
return std::unexpected(Created.error());
Location = MachineDebugLocation::inlineLocation(std::move(*Created));
}
if (auto Finished = finish(); !Finished)
return std::unexpected(Finished.error());
return Location;
}
} // namespace rcc::mir
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