1 files changed, 133 insertions, 0 deletions
diff --git a/llvm/lib/Bitcode/Reader/BitReader.cpp b/llvm/lib/Bitcode/Reader/BitReader.cpp
new file mode 100644
index 000000000000..5ac893aef14e
--- /dev/null
+++ b/llvm/lib/Bitcode/Reader/BitReader.cpp
@@ -0,0 +1,133 @@
+//===-- BitReader.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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm-c/BitReader.h"
+#include "llvm-c/Core.h"
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstring>
+#include <string>
+
+using namespace llvm;
+
+/* Builds a module from the bitcode in the specified memory buffer, returning a
+   reference to the module via the OutModule parameter. Returns 0 on success.
+   Optionally returns a human-readable error message via OutMessage. */
+LLVMBool LLVMParseBitcode(LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutModule,
+                          char **OutMessage) {
+  return LLVMParseBitcodeInContext(LLVMGetGlobalContext(), MemBuf, OutModule,
+                                   OutMessage);
+}
+
+LLVMBool LLVMParseBitcode2(LLVMMemoryBufferRef MemBuf,
+                           LLVMModuleRef *OutModule) {
+  return LLVMParseBitcodeInContext2(LLVMGetGlobalContext(), MemBuf, OutModule);
+}
+
+LLVMBool LLVMParseBitcodeInContext(LLVMContextRef ContextRef,
+                                   LLVMMemoryBufferRef MemBuf,
+                                   LLVMModuleRef *OutModule,
+                                   char **OutMessage) {
+  MemoryBufferRef Buf = unwrap(MemBuf)->getMemBufferRef();
+  LLVMContext &Ctx = *unwrap(ContextRef);
+
+  Expected<std::unique_ptr<Module>> ModuleOrErr = parseBitcodeFile(Buf, Ctx);
+  if (Error Err = ModuleOrErr.takeError()) {
+    std::string Message;
+    handleAllErrors(std::move(Err), [&](ErrorInfoBase &EIB) {
+      Message = EIB.message();
+    });
+    if (OutMessage)
+      *OutMessage = strdup(Message.c_str());
+    *OutModule = wrap((Module *)nullptr);
+    return 1;
+  }
+
+  *OutModule = wrap(ModuleOrErr.get().release());
+  return 0;
+}
+
+LLVMBool LLVMParseBitcodeInContext2(LLVMContextRef ContextRef,
+                                    LLVMMemoryBufferRef MemBuf,
+                                    LLVMModuleRef *OutModule) {
+  MemoryBufferRef Buf = unwrap(MemBuf)->getMemBufferRef();
+  LLVMContext &Ctx = *unwrap(ContextRef);
+
+  ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
+      expectedToErrorOrAndEmitErrors(Ctx, parseBitcodeFile(Buf, Ctx));
+  if (ModuleOrErr.getError()) {
+    *OutModule = wrap((Module *)nullptr);
+    return 1;
+  }
+
+  *OutModule = wrap(ModuleOrErr.get().release());
+  return 0;
+}
+
+/* Reads a module from the specified path, returning via the OutModule parameter
+   a module provider which performs lazy deserialization. Returns 0 on success.
+   Optionally returns a human-readable error message via OutMessage. */
+LLVMBool LLVMGetBitcodeModuleInContext(LLVMContextRef ContextRef,
+                                       LLVMMemoryBufferRef MemBuf,
+                                       LLVMModuleRef *OutM, char **OutMessage) {
+  LLVMContext &Ctx = *unwrap(ContextRef);
+  std::unique_ptr<MemoryBuffer> Owner(unwrap(MemBuf));
+  Expected<std::unique_ptr<Module>> ModuleOrErr =
+      getOwningLazyBitcodeModule(std::move(Owner), Ctx);
+  // Release the buffer if we didn't take ownership of it since we never owned
+  // it anyway.
+  (void)Owner.release();
+
+  if (Error Err = ModuleOrErr.takeError()) {
+    std::string Message;
+    handleAllErrors(std::move(Err), [&](ErrorInfoBase &EIB) {
+      Message = EIB.message();
+    });
+    if (OutMessage)
+      *OutMessage = strdup(Message.c_str());
+    *OutM = wrap((Module *)nullptr);
+    return 1;
+  }
+
+  *OutM = wrap(ModuleOrErr.get().release());
+
+  return 0;
+}
+
+LLVMBool LLVMGetBitcodeModuleInContext2(LLVMContextRef ContextRef,
+                                        LLVMMemoryBufferRef MemBuf,
+                                        LLVMModuleRef *OutM) {
+  LLVMContext &Ctx = *unwrap(ContextRef);
+  std::unique_ptr<MemoryBuffer> Owner(unwrap(MemBuf));
+
+  ErrorOr<std::unique_ptr<Module>> ModuleOrErr = expectedToErrorOrAndEmitErrors(
+      Ctx, getOwningLazyBitcodeModule(std::move(Owner), Ctx));
+  Owner.release();
+
+  if (ModuleOrErr.getError()) {
+    *OutM = wrap((Module *)nullptr);
+    return 1;
+  }
+
+  *OutM = wrap(ModuleOrErr.get().release());
+  return 0;
+}
+
+LLVMBool LLVMGetBitcodeModule(LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
+                              char **OutMessage) {
+  return LLVMGetBitcodeModuleInContext(LLVMGetGlobalContext(), MemBuf, OutM,
+                                       OutMessage);
+}
+
+LLVMBool LLVMGetBitcodeModule2(LLVMMemoryBufferRef MemBuf,
+                               LLVMModuleRef *OutM) {
+  return LLVMGetBitcodeModuleInContext2(LLVMGetGlobalContext(), MemBuf, OutM);
+}