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beebf4212b
readPrefixes() assumes insn->bytes is non-empty. The code path is not exercised in llvm-mc because llvm-mc does not feed empty input to MCDisassembler::getInstruction(). This bug is uncovered by a5994c789a2982a770254ae1607b5b4cb641f73c. An empty string did not crash before because the deleted regionReader() allowed UINT64_C(-1) as insn->readerCursor. Bytes.size() <= Address -> R->Base 0 <= UINT64_C(-1) - UINT32_C(-1)
111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
//===- llvm/unittest/Object/Disassembler.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 "llvm-c/Disassembler.h"
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#include "llvm/Support/TargetSelect.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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static const char *symbolLookupCallback(void *DisInfo, uint64_t ReferenceValue,
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uint64_t *ReferenceType,
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uint64_t ReferencePC,
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const char **ReferenceName) {
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*ReferenceType = LLVMDisassembler_ReferenceType_InOut_None;
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return nullptr;
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}
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TEST(Disassembler, X86Test) {
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llvm::InitializeAllTargetInfos();
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llvm::InitializeAllTargetMCs();
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llvm::InitializeAllDisassemblers();
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uint8_t Bytes[] = {0x90, 0x90, 0xeb, 0xfd};
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uint8_t *BytesP = Bytes;
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const char OutStringSize = 100;
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char OutString[OutStringSize];
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LLVMDisasmContextRef DCR = LLVMCreateDisasm("x86_64-pc-linux", nullptr, 0,
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nullptr, symbolLookupCallback);
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if (!DCR)
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return;
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size_t InstSize;
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unsigned NumBytes = sizeof(Bytes);
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unsigned PC = 0;
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InstSize =
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LLVMDisasmInstruction(DCR, BytesP, 0, PC, OutString, OutStringSize);
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EXPECT_EQ(InstSize, 0U);
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InstSize = LLVMDisasmInstruction(DCR, BytesP, NumBytes, PC, OutString,
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OutStringSize);
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EXPECT_EQ(InstSize, 1U);
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EXPECT_EQ(StringRef(OutString), "\tnop");
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PC += InstSize;
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BytesP += InstSize;
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NumBytes -= InstSize;
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InstSize = LLVMDisasmInstruction(DCR, BytesP, NumBytes, PC, OutString,
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OutStringSize);
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EXPECT_EQ(InstSize, 1U);
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EXPECT_EQ(StringRef(OutString), "\tnop");
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PC += InstSize;
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BytesP += InstSize;
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NumBytes -= InstSize;
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InstSize = LLVMDisasmInstruction(DCR, BytesP, NumBytes, PC, OutString,
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OutStringSize);
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EXPECT_EQ(InstSize, 2U);
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EXPECT_EQ(StringRef(OutString), "\tjmp\t0x1");
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LLVMDisasmDispose(DCR);
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}
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TEST(Disassembler, WebAssemblyTest) {
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llvm::InitializeAllTargetInfos();
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llvm::InitializeAllTargetMCs();
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llvm::InitializeAllDisassemblers();
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uint8_t Bytes[] = {0x6a, 0x42, 0x7F, 0x35, 0x01, 0x10};
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uint8_t *BytesP = Bytes;
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const char OutStringSize = 100;
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char OutString[OutStringSize];
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LLVMDisasmContextRef DCR = LLVMCreateDisasm("wasm32-unknown-unknown", nullptr,
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0, nullptr, symbolLookupCallback);
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if (!DCR)
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return;
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size_t InstSize;
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unsigned NumBytes = sizeof(Bytes);
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unsigned PC = 0;
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InstSize = LLVMDisasmInstruction(DCR, BytesP, NumBytes, PC, OutString,
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OutStringSize);
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EXPECT_EQ(InstSize, 1U);
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EXPECT_EQ(StringRef(OutString), "\ti32.add ");
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PC += InstSize;
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BytesP += InstSize;
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NumBytes -= InstSize;
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InstSize = LLVMDisasmInstruction(DCR, BytesP, NumBytes, PC, OutString,
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OutStringSize);
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EXPECT_EQ(InstSize, 2U);
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EXPECT_EQ(StringRef(OutString), "\ti64.const\t-1");
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PC += InstSize;
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BytesP += InstSize;
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NumBytes -= InstSize;
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InstSize = LLVMDisasmInstruction(DCR, BytesP, NumBytes, PC, OutString,
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OutStringSize);
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EXPECT_EQ(InstSize, 3U);
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EXPECT_EQ(StringRef(OutString), "\ti64.load32_u\t16:p2align=1");
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LLVMDisasmDispose(DCR);
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}
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