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Reduced stack usage when compiler aggressively inlines deserializeJson()

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This saves 64 bytes on the recursive part.
This commit is contained in:
Benoit Blanchon
2020-07-26 11:45:18 +02:00
parent 4df29fbac1
commit 2223d40640
1 changed files with 7 additions and 5 deletions
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12
src/ArduinoJson/Json/JsonDeserializer.hpp
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@@ -439,18 +439,17 @@ class JsonDeserializer {
} }
DeserializationError parseNumericValue(VariantData &result) { DeserializationError parseNumericValue(VariantData &result) {
char buffer[64];
uint8_t n = 0; uint8_t n = 0;
char c = current(); char c = current();
while (canBeInNonQuotedString(c) && n < 63) { while (canBeInNonQuotedString(c) && n < 63) {
move(); move();
buffer[n++] = c; _buffer[n++] = c;
c = current(); c = current();
} }
buffer[n] = 0; _buffer[n] = 0;
c = buffer[0]; c = _buffer[0];
if (c == 't') { // true if (c == 't') { // true
result.setBoolean(true); result.setBoolean(true);
return n == 4 ? DeserializationError::Ok return n == 4 ? DeserializationError::Ok
@@ -467,7 +466,7 @@ class JsonDeserializer {
: DeserializationError::IncompleteInput; : DeserializationError::IncompleteInput;
} }
ParsedNumber<Float, UInt> num = parseNumber<Float, UInt>(buffer); ParsedNumber<Float, UInt> num = parseNumber<Float, UInt>(_buffer);
switch (num.type()) { switch (num.type()) {
case VALUE_IS_NEGATIVE_INTEGER: case VALUE_IS_NEGATIVE_INTEGER:
@@ -597,6 +596,9 @@ class JsonDeserializer {
TStringStorage _stringStorage; TStringStorage _stringStorage;
Latch<TReader> _latch; Latch<TReader> _latch;
MemoryPool *_pool; MemoryPool *_pool;
char _buffer[64]; // using a member instead of a local variable because it
// ended in the recursive path after compiler inlined the
// code
}; };
// deserializeJson(JsonDocument&, const std::string&, ...) // deserializeJson(JsonDocument&, const std::string&, ...)