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Internals: Fix VL_ALLOC_RANDOM_CHECKS with multiple threads

This commit is contained in:
Wilson Snyder 2026-02-28 20:24:09 -05:00
parent e23c7a510e
commit e9dd6eaaf0
1 changed files with 4 additions and 2 deletions
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6
src/V3Ast.cpp
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@ -997,13 +997,15 @@ void AstNode::operator delete(void* objp, size_t size) {
#endif
#ifdef VL_ALLOC_RANDOM_CHECKS
void* AstNode::operator new(size_t size) {
void* AstNode::operator new(size_t size) { // VL_MT_SAFE
// Make the following small to debug this routine, larger for performance and better random
constexpr size_t POOL_SIZE = 65536; // Ideally large enough to fit all nodes used in tests
// Randomly select from a large pool (POOL_SIZE) of max-node sized (MAX_NODE_SIZE) pointers
static uint64_t s_lfsr = 0; // LFSR, 0 = didn't initialize yet
static std::array<void*, POOL_SIZE> s_nodePool;
if (int seed = v3Global.opt.debugAllocRandom()) {
static V3Mutex s_mutex;
const V3LockGuard lock{s_mutex};
static std::array<void*, POOL_SIZE> s_nodePool VL_GUARDED_BY(s_mutex);
constexpr uint64_t POLYNOMIAL = 0x80000000000019e2ULL;
UASSERT_STATIC(size <= ASTGEN_MAX_NODE_SIZE, "fix ASTGEN_MAX_NODE_SIZE");
if (!s_lfsr) {