//===----------------------------------------------------------------------===//
#include "llvm/Support/StreamingMemoryObject.h"
-#include "llvm/Support/Compiler.h"
#include <cassert>
#include <cstddef>
#include <cstring>
-
-
using namespace llvm;
namespace {
uint64_t getExtent() const override {
return LastChar - FirstChar;
}
- int readBytes(uint64_t address, uint64_t size,
- uint8_t *buf) const override;
+ uint64_t readBytes(uint8_t *Buf, uint64_t Size,
+ uint64_t Address) const override;
const uint8_t *getPointer(uint64_t address, uint64_t size) const override;
bool isValidAddress(uint64_t address) const override {
return validAddress(address);
}
- bool isObjectEnd(uint64_t address) const override {
- return objectEnd(address);
- }
private:
const uint8_t* const FirstChar;
bool validAddress(uint64_t address) const {
return static_cast<std::ptrdiff_t>(address) < LastChar - FirstChar;
}
- bool objectEnd(uint64_t address) const {
- return static_cast<std::ptrdiff_t>(address) == LastChar - FirstChar;
- }
- RawMemoryObject(const RawMemoryObject&) LLVM_DELETED_FUNCTION;
- void operator=(const RawMemoryObject&) LLVM_DELETED_FUNCTION;
+ RawMemoryObject(const RawMemoryObject&) = delete;
+ void operator=(const RawMemoryObject&) = delete;
};
-int RawMemoryObject::readBytes(uint64_t address,
- uint64_t size,
- uint8_t *buf) const {
- if (!validAddress(address) || !validAddress(address + size - 1)) return -1;
- memcpy(buf, (uint8_t *)(uintptr_t)(address + FirstChar), size);
- return size;
+uint64_t RawMemoryObject::readBytes(uint8_t *Buf, uint64_t Size,
+ uint64_t Address) const {
+ uint64_t BufferSize = LastChar - FirstChar;
+ if (Address >= BufferSize)
+ return 0;
+
+ uint64_t End = Address + Size;
+ if (End > BufferSize)
+ End = BufferSize;
+
+ assert(static_cast<int64_t>(End - Address) >= 0);
+ Size = End - Address;
+ memcpy(Buf, Address + FirstChar, Size);
+ return Size;
}
const uint8_t *RawMemoryObject::getPointer(uint64_t address,
// 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;
+ return fetchToPos(address);
}
uint64_t StreamingMemoryObject::getExtent() const {
return ObjectSize;
}
-int StreamingMemoryObject::readBytes(uint64_t address,
- uint64_t size,
- uint8_t *buf) const {
- if (!fetchToPos(address + size - 1)) return -1;
- memcpy(buf, &Bytes[address + BytesSkipped], size);
- return 0;
+uint64_t StreamingMemoryObject::readBytes(uint8_t *Buf, uint64_t Size,
+ uint64_t Address) const {
+ fetchToPos(Address + Size - 1);
+ // Note: For wrapped bitcode files will set ObjectSize after the
+ // first call to fetchToPos. In such cases, ObjectSize can be
+ // smaller than BytesRead.
+ size_t MaxAddress =
+ (ObjectSize && ObjectSize < BytesRead) ? ObjectSize : BytesRead;
+ if (Address >= MaxAddress)
+ return 0;
+
+ uint64_t End = Address + Size;
+ if (End > MaxAddress)
+ End = MaxAddress;
+ assert(End >= Address);
+ Size = End - Address;
+ memcpy(Buf, &Bytes[Address + BytesSkipped], Size);
+ return Size;
}
bool StreamingMemoryObject::dropLeadingBytes(size_t s) {
void StreamingMemoryObject::setKnownObjectSize(size_t size) {
ObjectSize = size;
Bytes.reserve(size);
+ if (ObjectSize <= BytesRead)
+ EOFReached = true;
}
MemoryObject *getNonStreamedMemoryObject(const unsigned char *Start,
return new RawMemoryObject(Start, End);
}
-StreamingMemoryObject::StreamingMemoryObject(DataStreamer *streamer) :
- Bytes(kChunkSize), Streamer(streamer), BytesRead(0), BytesSkipped(0),
- ObjectSize(0), EOFReached(false) {
- BytesRead = streamer->GetBytes(&Bytes[0], kChunkSize);
+StreamingMemoryObject::StreamingMemoryObject(
+ std::unique_ptr<DataStreamer> Streamer)
+ : Bytes(kChunkSize), Streamer(std::move(Streamer)), BytesRead(0),
+ BytesSkipped(0), ObjectSize(0), EOFReached(false) {
+ BytesRead = this->Streamer->GetBytes(&Bytes[0], kChunkSize);
}
}