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spirv-fuzz: Improvements to random number generation (#3809)

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This PR extends the RandomGenerator interface and fixes the
PseudoRandomGenerator class. It:

- Fixes a problem that made the RandomUint32 of PseudoRandomGenerator
  segfault.
- Adds the RandomUint64 function to RandomGenerator and
  PseudoRandomGenerator.

Fixes #3805.
This commit is contained in:
Stefano Milizia 2020-09-16 16:45:05 +02:00 committed by GitHub
parent 7e28d809c6
commit 8d49fb2f4d
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3 changed files with 11 additions and 2 deletions
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8
source/fuzz/pseudo_random_generator.cpp
View File

@ -25,8 +25,12 @@ PseudoRandomGenerator::~PseudoRandomGenerator() = default;
uint32_t PseudoRandomGenerator::RandomUint32(uint32_t bound) {
assert(bound > 0 && "Bound must be positive");
return static_cast<uint32_t>(
std::uniform_int_distribution<>(0, bound - 1)(mt_));
return std::uniform_int_distribution<uint32_t>(0, bound - 1)(mt_);
}
uint64_t PseudoRandomGenerator::RandomUint64(uint64_t bound) {
assert(bound > 0 && "Bound must be positive");
return std::uniform_int_distribution<uint64_t>(0, bound - 1)(mt_);
}
bool PseudoRandomGenerator::RandomBool() {

2
source/fuzz/pseudo_random_generator.h
View File

@ -31,6 +31,8 @@ class PseudoRandomGenerator : public RandomGenerator {
uint32_t RandomUint32(uint32_t bound) override;
uint64_t RandomUint64(uint64_t bound) override;
uint32_t RandomPercentage() override;
bool RandomBool() override;

3
source/fuzz/random_generator.h
View File

@ -29,6 +29,9 @@ class RandomGenerator {
// Returns a value in the half-open interval [0, bound).
virtual uint32_t RandomUint32(uint32_t bound) = 0;
// Returns a value in the half-open interval [0, bound).
virtual uint64_t RandomUint64(uint64_t bound) = 0;
// Returns a value in the closed interval [0, 100].
virtual uint32_t RandomPercentage() = 0;