Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/lib/IRReader/IRReader.cpp

@@ -0,0 +1,134 @@
+//===---- IRReader.cpp - Reader for LLVM IR files -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#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";
+
+static std::unique_ptr<Module>
+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,
+                                      bool UpgradeDebugInfo) {
+  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);
+    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, UpgradeDebugInfo);
+}
+
+std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
+                                          LLVMContext &Context,
+                                          bool UpgradeDebugInfo) {
+  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,
+                 UpgradeDebugInfo);
+}
+
+//===----------------------------------------------------------------------===//
+// 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;
+}