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fc54427e76
Currently, all data buffers are assumed to be writable. This is a problem on macOS where it's not allowed to load unsigned binaries in memory as writable. To be more precise, MAP_RESILIENT_CODESIGN and MAP_RESILIENT_MEDIA need to be set for mapped (unsigned) binaries on our platform. Binaries are mapped through FileSystem::CreateDataBuffer which returns a DataBufferLLVM. The latter is backed by a llvm::WritableMemoryBuffer because every DataBuffer in LLDB is considered to be writable. In order to use a read-only llvm::MemoryBuffer I had to split our abstraction around it. This patch distinguishes between a DataBuffer (read-only) and WritableDataBuffer (read-write) and updates LLDB to use the appropriate one. rdar://74890607 Differential revision: https://reviews.llvm.org/D122856
57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
//===-- DataBufferTest.cpp ------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "lldb/Utility/DataBuffer.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/DataBufferLLVM.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/MemoryBuffer.h"
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using namespace lldb_private;
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using namespace lldb;
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TEST(DataBufferTest, RTTI) {
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{
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DataBufferSP data_buffer_sp = std::make_shared<DataBufferHeap>();
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DataBuffer *data_buffer = data_buffer_sp.get();
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EXPECT_TRUE(llvm::isa<DataBuffer>(data_buffer));
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EXPECT_TRUE(llvm::isa<WritableDataBuffer>(data_buffer));
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EXPECT_TRUE(llvm::isa<DataBufferHeap>(data_buffer));
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EXPECT_FALSE(llvm::isa<DataBufferLLVM>(data_buffer));
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}
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{
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llvm::StringRef data;
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DataBufferSP data_buffer_sp = std::make_shared<DataBufferLLVM>(
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llvm::MemoryBuffer::getMemBufferCopy(data));
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DataBuffer *data_buffer = data_buffer_sp.get();
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EXPECT_TRUE(llvm::isa<DataBuffer>(data_buffer));
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EXPECT_TRUE(llvm::isa<DataBufferLLVM>(data_buffer));
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EXPECT_FALSE(llvm::isa<WritableDataBuffer>(data_buffer));
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EXPECT_FALSE(llvm::isa<WritableDataBufferLLVM>(data_buffer));
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EXPECT_FALSE(llvm::isa<DataBufferHeap>(data_buffer));
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}
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{
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DataBufferSP data_buffer_sp = std::make_shared<WritableDataBufferLLVM>(
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llvm::WritableMemoryBuffer::getNewMemBuffer(1));
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DataBuffer *data_buffer = data_buffer_sp.get();
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EXPECT_TRUE(llvm::isa<DataBuffer>(data_buffer));
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EXPECT_TRUE(llvm::isa<WritableDataBuffer>(data_buffer));
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EXPECT_TRUE(llvm::isa<WritableDataBufferLLVM>(data_buffer));
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EXPECT_FALSE(llvm::isa<DataBufferLLVM>(data_buffer));
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EXPECT_FALSE(llvm::isa<DataBufferHeap>(data_buffer));
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}
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}
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