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Avoid static analyzer warnings regarding uninitialized arguments

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Avoid static analyzer warnings regarding "Function call argument
is a pointer to uninitialized value" in cases where we are
intentionally using such arguments.

This is achieved by using ...

`f(b.begin(), b.end())` (`std::array<char, N>`)

... instead of ...

`f(b, b + N)` (`char b[N]`)

Rationale:
* Reduce false positives by guiding static analyzers regarding our
  intentions.

Before this commit:

```
$ clang-tidy-3.5 -checks=* src/bench/base58.cpp
bench/base58.cpp:23:9: warning: Function call argument is a pointer to uninitialized value [clang-analyzer-core.CallAndMessage]
        EncodeBase58(b, b + 32);
        ^
$ clang-tidy-3.5 -checks=* src/bench/verify_script.cpp
bench/verify_script.cpp:59:5: warning: Function call argument is a pointer to uninitialized value [clang-analyzer-core.CallAndMessage]
    key.Set(vchKey, vchKey + 32, false);
    ^
$
```

After this commit:

```
$ clang-tidy-3.5 -checks=* src/bench/base58.cpp
$ clang-tidy-3.5 -checks=* src/bench/verify_script.cpp
$
```
This commit is contained in:
practicalswift 2017-07-03 17:46:43 +02:00
parent 8fdd23a224
commit 6835cb0ab2
2 changed files with 23 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/bench/base58.cpp
View File

@ -7,34 +7,37 @@
#include "validation.h"
#include "base58.h"
#include <array>
#include <vector>
#include <string>
static void Base58Encode(benchmark::State& state)
{
unsigned char buff[32] = {
static const std::array<unsigned char, 32> buff = {
{
17, 79, 8, 99, 150, 189, 208, 162, 22, 23, 203, 163, 36, 58, 147,
227, 139, 2, 215, 100, 91, 38, 11, 141, 253, 40, 117, 21, 16, 90,
200, 24
}
};
unsigned char* b = buff;
while (state.KeepRunning()) {
EncodeBase58(b, b + 32);
EncodeBase58(buff.begin(), buff.end());
}
}
static void Base58CheckEncode(benchmark::State& state)
{
unsigned char buff[32] = {
static const std::array<unsigned char, 32> buff = {
{
17, 79, 8, 99, 150, 189, 208, 162, 22, 23, 203, 163, 36, 58, 147,
227, 139, 2, 215, 100, 91, 38, 11, 141, 253, 40, 117, 21, 16, 90,
200, 24
}
};
unsigned char* b = buff;
std::vector<unsigned char> vch;
vch.assign(b, b + 32);
vch.assign(buff.begin(), buff.end());
while (state.KeepRunning()) {
EncodeBase58Check(vch);
}

10
src/bench/verify_script.cpp
View File

@ -11,6 +11,8 @@
#include "script/sign.h"
#include "streams.h"
#include <array>
// FIXME: Dedup with BuildCreditingTransaction in test/script_tests.cpp.
static CMutableTransaction BuildCreditingTransaction(const CScript& scriptPubKey)
{
@ -55,8 +57,12 @@ static void VerifyScriptBench(benchmark::State& state)
// Keypair.
CKey key;
const unsigned char vchKey[32] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
key.Set(vchKey, vchKey + 32, false);
static const std::array<unsigned char, 32> vchKey = {
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
}
};
key.Set(vchKey.begin(), vchKey.end(), false);
CPubKey pubkey = key.GetPubKey();
uint160 pubkeyHash;
CHash160().Write(pubkey.begin(), pubkey.size()).Finalize(pubkeyHash.begin());