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//===- RemarkParser.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides utility methods used by clients that want to use the
// parser for remark diagnostics in LLVM.
//
//===----------------------------------------------------------------------===//
#include "llvm/Remarks/RemarkParser.h"
#include "YAMLRemarkParser.h"
#include "llvm-c/Remarks.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/CBindingWrapping.h"
using namespace llvm;
using namespace llvm::remarks;
Parser::Parser(StringRef Buf) : Impl(llvm::make_unique<YAMLParserImpl>(Buf)) {}
Parser::Parser(StringRef Buf, StringRef StrTabBuf)
: Impl(llvm::make_unique<YAMLParserImpl>(Buf, StrTabBuf)) {}
Parser::~Parser() = default;
static Expected<const Remark *> getNextYAML(YAMLParserImpl &Impl) {
YAMLRemarkParser &YAMLParser = Impl.YAMLParser;
// Check for EOF.
if (Impl.YAMLIt == Impl.YAMLParser.Stream.end())
return nullptr;
auto CurrentIt = Impl.YAMLIt;
// Try to parse an entry.
if (Error E = YAMLParser.parseYAMLElement(*CurrentIt)) {
// Set the iterator to the end, in case the user calls getNext again.
Impl.YAMLIt = Impl.YAMLParser.Stream.end();
return std::move(E);
}
// Move on.
++Impl.YAMLIt;
// Return the just-parsed remark.
if (const Optional<YAMLRemarkParser::ParseState> &State = YAMLParser.State)
return &State->TheRemark;
else
return createStringError(std::make_error_code(std::errc::invalid_argument),
"unexpected error while parsing.");
}
Expected<const Remark *> Parser::getNext() const {
if (auto *Impl = dyn_cast<YAMLParserImpl>(this->Impl.get()))
return getNextYAML(*Impl);
llvm_unreachable("Get next called with an unknown parsing implementation.");
}
ParsedStringTable::ParsedStringTable(StringRef InBuffer) : Buffer(InBuffer) {
while (!InBuffer.empty()) {
// Strings are separated by '\0' bytes.
std::pair<StringRef, StringRef> Split = InBuffer.split('\0');
// We only store the offset from the beginning of the buffer.
Offsets.push_back(Split.first.data() - Buffer.data());
InBuffer = Split.second;
}
}
Expected<StringRef> ParsedStringTable::operator[](size_t Index) {
if (Index >= Offsets.size())
return createStringError(
std::make_error_code(std::errc::invalid_argument),
"String with index %u is out of bounds (size = %u).", Index,
Offsets.size());
size_t Offset = Offsets[Index];
// If it's the last offset, we can't use the next offset to know the size of
// the string.
size_t NextOffset =
(Index == Offsets.size() - 1) ? Buffer.size() : Offsets[Index + 1];
return StringRef(Buffer.data() + Offset, NextOffset - Offset - 1);
}
// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(remarks::Parser, LLVMRemarkParserRef)
extern "C" LLVMRemarkParserRef LLVMRemarkParserCreateYAML(const void *Buf,
uint64_t Size) {
return wrap(
new remarks::Parser(StringRef(static_cast<const char *>(Buf), Size)));
}
static void handleYAMLError(remarks::YAMLParserImpl &Impl, Error E) {
handleAllErrors(
std::move(E),
[&](const YAMLParseError &PE) {
Impl.YAMLParser.Stream.printError(&PE.getNode(),
Twine(PE.getMessage()) + Twine('\n'));
},
[&](const ErrorInfoBase &EIB) { EIB.log(Impl.YAMLParser.ErrorStream); });
Impl.HasErrors = true;
}
extern "C" LLVMRemarkEntryRef
LLVMRemarkParserGetNext(LLVMRemarkParserRef Parser) {
remarks::Parser &TheParser = *unwrap(Parser);
Expected<const remarks::Remark *> RemarkOrErr = TheParser.getNext();
if (!RemarkOrErr) {
// Error during parsing.
if (auto *Impl = dyn_cast<remarks::YAMLParserImpl>(TheParser.Impl.get()))
handleYAMLError(*Impl, RemarkOrErr.takeError());
else
llvm_unreachable("unkown parser implementation.");
return nullptr;
}
if (*RemarkOrErr == nullptr)
return nullptr;
// Valid remark.
return wrap(*RemarkOrErr);
}
extern "C" LLVMBool LLVMRemarkParserHasError(LLVMRemarkParserRef Parser) {
if (auto *Impl =
dyn_cast<remarks::YAMLParserImpl>(unwrap(Parser)->Impl.get()))
return Impl->HasErrors;
llvm_unreachable("unkown parser implementation.");
}
extern "C" const char *
LLVMRemarkParserGetErrorMessage(LLVMRemarkParserRef Parser) {
if (auto *Impl =
dyn_cast<remarks::YAMLParserImpl>(unwrap(Parser)->Impl.get()))
return Impl->YAMLParser.ErrorStream.str().c_str();
llvm_unreachable("unkown parser implementation.");
}
extern "C" void LLVMRemarkParserDispose(LLVMRemarkParserRef Parser) {
delete unwrap(Parser);
}
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