IRReader.cpp
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//===---- IRReader.cpp - Reader for LLVM IR files -------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/IRReader/IRReader.h"
#include "llvm-c/IRReader.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include <system_error>
using namespace llvm;
namespace llvm {
extern bool TimePassesIsEnabled;
}
static const char *const TimeIRParsingGroupName = "irparse";
static const char *const TimeIRParsingGroupDescription = "LLVM IR Parsing";
static const char *const TimeIRParsingName = "parse";
static const char *const TimeIRParsingDescription = "Parse IR";
std::unique_ptr<Module>
llvm::getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
LLVMContext &Context, bool ShouldLazyLoadMetadata) {
if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
(const unsigned char *)Buffer->getBufferEnd())) {
Expected<std::unique_ptr<Module>> ModuleOrErr = getOwningLazyBitcodeModule(
std::move(Buffer), Context, ShouldLazyLoadMetadata);
if (Error E = ModuleOrErr.takeError()) {
handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
EIB.message());
});
return nullptr;
}
return std::move(ModuleOrErr.get());
}
return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
}
std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
SMDiagnostic &Err,
LLVMContext &Context,
bool ShouldLazyLoadMetadata) {
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFileOrSTDIN(Filename);
if (std::error_code EC = FileOrErr.getError()) {
Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
"Could not open input file: " + EC.message());
return nullptr;
}
return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
ShouldLazyLoadMetadata);
}
std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
LLVMContext &Context,
DataLayoutCallbackTy DataLayoutCallback) {
NamedRegionTimer T(TimeIRParsingName, TimeIRParsingDescription,
TimeIRParsingGroupName, TimeIRParsingGroupDescription,
TimePassesIsEnabled);
if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
(const unsigned char *)Buffer.getBufferEnd())) {
Expected<std::unique_ptr<Module>> ModuleOrErr =
parseBitcodeFile(Buffer, Context, DataLayoutCallback);
if (Error E = ModuleOrErr.takeError()) {
handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
EIB.message());
});
return nullptr;
}
return std::move(ModuleOrErr.get());
}
return parseAssembly(Buffer, Err, Context, nullptr, DataLayoutCallback);
}
std::unique_ptr<Module>
llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err, LLVMContext &Context,
DataLayoutCallbackTy DataLayoutCallback) {
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFileOrSTDIN(Filename);
if (std::error_code EC = FileOrErr.getError()) {
Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
"Could not open input file: " + EC.message());
return nullptr;
}
return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context,
DataLayoutCallback);
}
//===----------------------------------------------------------------------===//
// C API.
//===----------------------------------------------------------------------===//
LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
char **OutMessage) {
SMDiagnostic Diag;
std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
*OutM =
wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
if(!*OutM) {
if (OutMessage) {
std::string buf;
raw_string_ostream os(buf);
Diag.print(nullptr, os, false);
os.flush();
*OutMessage = strdup(buf.c_str());
}
return 1;
}
return 0;
}