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//===- MSFBuilderTest.cpp Tests manipulation of MSF stream metadata ------===//
//
// 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/DebugInfo/MSF/MSFCommon.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace llvm::msf;
TEST(MSFCommonTest, BytesToBlocks) {
EXPECT_EQ(0ULL, bytesToBlocks(0, 4096));
EXPECT_EQ(1ULL, bytesToBlocks(12, 4096));
EXPECT_EQ(1ULL, bytesToBlocks(4096, 4096));
EXPECT_EQ(2ULL, bytesToBlocks(4097, 4096));
EXPECT_EQ(2ULL, bytesToBlocks(600, 512));
}
TEST(MSFCommonTest, FpmIntervals) {
SuperBlock SB;
SB.FreeBlockMapBlock = 1;
SB.BlockSize = 4096;
MSFLayout L;
L.SB = &SB;
SB.NumBlocks = 12;
EXPECT_EQ(1u, getNumFpmIntervals(L, false));
SB.NumBlocks = SB.BlockSize;
EXPECT_EQ(1u, getNumFpmIntervals(L, false));
SB.NumBlocks = SB.BlockSize + 1;
EXPECT_EQ(1u, getNumFpmIntervals(L, false));
SB.NumBlocks = SB.BlockSize * 8;
EXPECT_EQ(1u, getNumFpmIntervals(L, false));
SB.NumBlocks = SB.BlockSize * 8 + 1;
EXPECT_EQ(2u, getNumFpmIntervals(L, false));
SB.NumBlocks = 12;
EXPECT_EQ(1u, getNumFpmIntervals(L, true));
SB.NumBlocks = SB.BlockSize;
EXPECT_EQ(1u, getNumFpmIntervals(L, true));
SB.NumBlocks = SB.BlockSize * 8;
EXPECT_EQ(8u, getNumFpmIntervals(L, true));
// The FPM is going to look like this:
// | 0 | 1 | 2 | ... | 4096 | 4097 | 4098 | ... |
// | SB | FPM0 | FPM1 | Data | Data | FPM0 | FPM1 | ... |
//
// So when there are up to 4097 blocks (last index 4096), the final blocks
// are data blocks. When there are 4098 blocks (last index 4097), there is
// one terminating FPM block, and when there are 4099 blocks, there are two
// terminating FPM blocks. Make sure all these cases are handled.
// With 4096 or 4097 blocks, the last block is a data block so we only have
// 1 interval.
for (uint32_t I : {4096, 4097}) {
// 1 FPM0 interval
EXPECT_EQ(1U, getNumFpmIntervals(4096, I, true, 1));
EXPECT_EQ(1U, getNumFpmIntervals(4096, I, false, 1));
// 1 FPM1 interval
EXPECT_EQ(1U, getNumFpmIntervals(4096, I, true, 2));
EXPECT_EQ(1U, getNumFpmIntervals(4096, I, false, 2));
}
// With 4098 blocks, the last block belongs to FPM0 so we should have 2 FPM0
// intervals.
EXPECT_EQ(2U, getNumFpmIntervals(4096, 4098, true, 1));
EXPECT_EQ(1U, getNumFpmIntervals(4096, 4098, false, 1));
// And 1 FPM1 interval.
EXPECT_EQ(1U, getNumFpmIntervals(4096, 4098, true, 2));
EXPECT_EQ(1U, getNumFpmIntervals(4096, 4098, false, 2));
// With 4099 blocks, the last block belongs to FPM1 so we should have 2
// FPM0 intervals.
EXPECT_EQ(2U, getNumFpmIntervals(4096, 4099, true, 1));
EXPECT_EQ(1U, getNumFpmIntervals(4096, 4099, false, 1));
// And 2 FPM1 intervals.
EXPECT_EQ(2U, getNumFpmIntervals(4096, 4099, true, 2));
EXPECT_EQ(1U, getNumFpmIntervals(4096, 4099, false, 2));
}
TEST(MSFCommonTest, FpmStreamLayout) {
SuperBlock SB;
MSFLayout L;
L.SB = &SB;
SB.FreeBlockMapBlock = 1;
// Each FPM block has 4096 bytes for a maximum of 4096*8 allocation states.
SB.BlockSize = 4096;
// 1. When we're not including unused FPM data, the length of the FPM stream
// should be only long enough to contain 1 bit for each block.
// 1a. When the PDB has <= 4096*8 blocks, there should only be one FPM block.
SB.NumBlocks = 8000;
MSFStreamLayout SL = getFpmStreamLayout(L, false, false);
EXPECT_EQ(1000u, SL.Length);
EXPECT_EQ(1u, SL.Blocks.size());
EXPECT_EQ(SB.FreeBlockMapBlock, SL.Blocks.front());
SL = getFpmStreamLayout(L, false, true);
EXPECT_EQ(1000u, SL.Length);
EXPECT_EQ(1u, SL.Blocks.size());
EXPECT_EQ(3u - SB.FreeBlockMapBlock, SL.Blocks.front());
// 1b. When the PDB has > 4096*8 blocks, there should be multiple FPM blocks.
SB.NumBlocks = SB.BlockSize * 8 + 1;
SL = getFpmStreamLayout(L, false, false);
EXPECT_EQ(SB.BlockSize + 1, SL.Length);
EXPECT_EQ(2u, SL.Blocks.size());
EXPECT_EQ(SB.FreeBlockMapBlock, SL.Blocks[0]);
EXPECT_EQ(SB.FreeBlockMapBlock + SB.BlockSize, SL.Blocks[1]);
SL = getFpmStreamLayout(L, false, true);
EXPECT_EQ(SB.BlockSize + 1, SL.Length);
EXPECT_EQ(2u, SL.Blocks.size());
EXPECT_EQ(3u - SB.FreeBlockMapBlock, SL.Blocks[0]);
EXPECT_EQ(3u - SB.FreeBlockMapBlock + SB.BlockSize, SL.Blocks[1]);
// 2. When we are including unused FPM data, there should be one FPM block
// at every BlockSize interval in the file, even if entire FPM blocks are
// unused.
SB.NumBlocks = SB.BlockSize * 8 + 3;
SL = getFpmStreamLayout(L, true, false);
EXPECT_EQ(SB.BlockSize * 9, SL.Length);
EXPECT_EQ(9u, SL.Blocks.size());
for (int I = 0; I < 9; ++I)
EXPECT_EQ(I * SB.BlockSize + SB.FreeBlockMapBlock, SL.Blocks[I]);
}
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