From 1fc08f5e9ef733ef1ce6f363fecedc2260e78974 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Sat, 14 Apr 2012 13:54:10 +0000
Subject: Vendor import of llvm trunk r154661:
http://llvm.org/svn/llvm-project/llvm/trunk@r154661
---
lib/Support/StreamableMemoryObject.cpp | 140 +++++++++++++++++++++++++++++++++
1 file changed, 140 insertions(+)
create mode 100644 lib/Support/StreamableMemoryObject.cpp
(limited to 'lib/Support/StreamableMemoryObject.cpp')
diff --git a/lib/Support/StreamableMemoryObject.cpp b/lib/Support/StreamableMemoryObject.cpp
new file mode 100644
index 0000000..c23f07b
--- /dev/null
+++ b/lib/Support/StreamableMemoryObject.cpp
@@ -0,0 +1,140 @@
+//===- StreamableMemoryObject.cpp - Streamable data interface -------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/StreamableMemoryObject.h"
+#include <cassert>
+#include <cstring>
+
+
+using namespace llvm;
+
+namespace {
+
+class RawMemoryObject : public StreamableMemoryObject {
+public:
+ RawMemoryObject(const unsigned char *Start, const unsigned char *End) :
+ FirstChar(Start), LastChar(End) {
+ assert(LastChar > FirstChar && "Invalid start/end range");
+ }
+
+ virtual uint64_t getBase() const { return 0; }
+ virtual uint64_t getExtent() const { return LastChar - FirstChar; }
+ virtual int readByte(uint64_t address, uint8_t* ptr) const;
+ virtual int readBytes(uint64_t address,
+ uint64_t size,
+ uint8_t* buf,
+ uint64_t* copied) const;
+ virtual const uint8_t *getPointer(uint64_t address, uint64_t size) const;
+ virtual bool isValidAddress(uint64_t address) const {
+ return validAddress(address);
+ }
+ virtual bool isObjectEnd(uint64_t address) const {return objectEnd(address);}
+
+private:
+ const uint8_t* const FirstChar;
+ const uint8_t* const LastChar;
+
+ // These are implemented as inline functions here to avoid multiple virtual
+ // calls per public function
+ bool validAddress(uint64_t address) const {
+ return static_cast<ptrdiff_t>(address) < LastChar - FirstChar;
+ }
+ bool objectEnd(uint64_t address) const {
+ return static_cast<ptrdiff_t>(address) == LastChar - FirstChar;
+ }
+
+ RawMemoryObject(const RawMemoryObject&); // DO NOT IMPLEMENT
+ void operator=(const RawMemoryObject&); // DO NOT IMPLEMENT
+};
+
+int RawMemoryObject::readByte(uint64_t address, uint8_t* ptr) const {
+ if (!validAddress(address)) return -1;
+ *ptr = *((uint8_t *)(uintptr_t)(address + FirstChar));
+ return 0;
+}
+
+int RawMemoryObject::readBytes(uint64_t address,
+ uint64_t size,
+ uint8_t* buf,
+ uint64_t* copied) const {
+ if (!validAddress(address) || !validAddress(address + size - 1)) return -1;
+ memcpy(buf, (uint8_t *)(uintptr_t)(address + FirstChar), size);
+ if (copied) *copied = size;
+ return size;
+}
+
+const uint8_t *RawMemoryObject::getPointer(uint64_t address,
+ uint64_t size) const {
+ return FirstChar + address;
+}
+} // anonymous namespace
+
+namespace llvm {
+// If the bitcode has a header, then its size is known, and we don't have to
+// block until we actually want to read it.
+bool StreamingMemoryObject::isValidAddress(uint64_t address) const {
+ if (ObjectSize && address < ObjectSize) return true;
+ return fetchToPos(address);
+}
+
+bool StreamingMemoryObject::isObjectEnd(uint64_t address) const {
+ if (ObjectSize) return address == ObjectSize;
+ fetchToPos(address);
+ return address == ObjectSize && address != 0;
+}
+
+uint64_t StreamingMemoryObject::getExtent() const {
+ if (ObjectSize) return ObjectSize;
+ size_t pos = BytesRead + kChunkSize;
+ // keep fetching until we run out of bytes
+ while (fetchToPos(pos)) pos += kChunkSize;
+ return ObjectSize;
+}
+
+int StreamingMemoryObject::readByte(uint64_t address, uint8_t* ptr) const {
+ if (!fetchToPos(address)) return -1;
+ *ptr = Bytes[address + BytesSkipped];
+ return 0;
+}
+
+int StreamingMemoryObject::readBytes(uint64_t address,
+ uint64_t size,
+ uint8_t* buf,
+ uint64_t* copied) const {
+ if (!fetchToPos(address + size - 1)) return -1;
+ memcpy(buf, &Bytes[address + BytesSkipped], size);
+ if (copied) *copied = size;
+ return 0;
+}
+
+bool StreamingMemoryObject::dropLeadingBytes(size_t s) {
+ if (BytesRead < s) return true;
+ BytesSkipped = s;
+ BytesRead -= s;
+ return false;
+}
+
+void StreamingMemoryObject::setKnownObjectSize(size_t size) {
+ ObjectSize = size;
+ Bytes.reserve(size);
+}
+
+StreamableMemoryObject *getNonStreamedMemoryObject(
+ const unsigned char *Start, const unsigned char *End) {
+ return new RawMemoryObject(Start, End);
+}
+
+StreamableMemoryObject::~StreamableMemoryObject() { }
+
+StreamingMemoryObject::StreamingMemoryObject(DataStreamer *streamer) :
+ Bytes(kChunkSize), Streamer(streamer), BytesRead(0), BytesSkipped(0),
+ ObjectSize(0), EOFReached(false) {
+ BytesRead = streamer->GetBytes(&Bytes[0], kChunkSize);
+}
+}
--
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