v8/test/cctest/test-fuzz-a64.cc

// Copyright 2013 the V8 project authors. All rights reserved.
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#include <stdlib.h>
#include "cctest.h"

#include "a64/decoder-a64.h"
#include "a64/decoder-a64-inl.h"
#include "a64/disasm-a64.h"

using namespace v8::internal;

TEST(FUZZ_decoder) {
  // Feed noise into the decoder to check that it doesn't crash.
  // 43 million = ~1% of the instruction space.
  static const int instruction_count = 43 * 1024 * 1024;

  uint16_t seed[3] = {1, 2, 3};
  seed48(seed);

  Decoder<DispatchingDecoderVisitor> decoder;
  Instruction buffer[kInstructionSize];

  for (int i = 0; i < instruction_count; i++) {
    uint32_t instr = mrand48();
    buffer->SetInstructionBits(instr);
    decoder.Decode(buffer);
  }
}


TEST(FUZZ_disasm) {
  // Feed noise into the disassembler to check that it doesn't crash.
  // 9 million = ~0.2% of the instruction space.
  static const int instruction_count = 9 * 1024 * 1024;

  uint16_t seed[3] = {42, 43, 44};
  seed48(seed);

  Decoder<DispatchingDecoderVisitor> decoder;
  Disassembler disasm;
  Instruction buffer[kInstructionSize];

  decoder.AppendVisitor(&disasm);
  for (int i = 0; i < instruction_count; i++) {
    uint32_t instr = mrand48();
    buffer->SetInstructionBits(instr);
    decoder.Decode(buffer);
  }
}