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[core] Add FixedVector::try_init so callers can handle an exhausted heap (#19253)

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This commit is contained in:
J. Nick Koston
2026-09-14 09:16:37 +12:00
committed by GitHub
parent fc8611a212
commit 4f0faac148
3 changed files with 61 additions and 13 deletions
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tests/components/core/test_helpers.cpp
+19
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@@ -348,4 +348,23 @@ TEST(StepToAccuracyDecimals, NonFiniteAndZero) {
EXPECT_EQ(step_to_accuracy_decimals(-INFINITY), 0);
}
// --- FixedVector::try_init() ---
// Keeps the block observable, else the compiler may drop the malloc and free pair and fold the check
static void escape(const void *p) { asm volatile("" : : "g"(p) : "memory"); }
TEST(FixedVectorTryInit, ReportsExhaustionAndStaysEmpty) {
FixedVector<uint32_t> v;
const bool ok = v.try_init(SIZE_MAX / sizeof(uint32_t));
escape(&v);
EXPECT_FALSE(ok);
EXPECT_EQ(v.capacity(), 0u);
EXPECT_FALSE(v.try_init(SIZE_MAX / sizeof(uint32_t) + 1)); // byte count would wrap
EXPECT_EQ(v.capacity(), 0u);
EXPECT_TRUE(v.try_init(0));
EXPECT_TRUE(v.try_init(4));
v.push_back(7);
EXPECT_EQ(v.size(), 1u);
}
} // namespace esphome::core::testing