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fix : Dangling pointer for non-empty trigger words in lazy grammar construction (#17048)

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* fix : Dangling pointer for non-empty trigger words in llama_sampler_init_grammar_impl (#17047)

* Replace 'static' workaround, with keeping variable in scope for longer

* Create std::array directly and pass into llama_grammar_init_impl

* Add back the trigger pattern

* Missed array include
This commit is contained in:
Marek Hradil jr.
2025-11-14 13:35:26 +01:00
committed by GitHub
parent d396b43748
commit 6cd0cf72ce
1 changed files with 10 additions and 5 deletions
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15
src/llama-sampling.cpp
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@@ -4,6 +4,7 @@
#include "llama-vocab.h"
#include "llama-grammar.h"
#include <array>
#include <algorithm>
#include <cassert>
#include <cfloat>
@@ -1625,10 +1626,12 @@ static struct llama_sampler * llama_sampler_init_grammar_impl(
auto * ctx = new llama_sampler_grammar;
if (grammar_str != nullptr && grammar_str[0] != '\0') {
std::string trigger_pattern;
llama_grammar * grammar = nullptr;
// TODO: remove trigger_words support.
if (trigger_words != nullptr && num_trigger_words > 0) {
GGML_ASSERT(trigger_patterns == nullptr && num_trigger_patterns == 0);
std::string trigger_pattern("[\\s\\S]*?(");
trigger_pattern = "[\\s\\S]*?(";
for (size_t i = 0; i < num_trigger_words; ++i) {
static const std::regex special_chars("[.^$|()*+?\\[\\]{}\\\\]");
if (i > 0) {
@@ -1637,15 +1640,17 @@ static struct llama_sampler * llama_sampler_init_grammar_impl(
trigger_pattern += std::regex_replace(trigger_words[i], special_chars, "\\$0");
}
trigger_pattern += ")[\\s\\S]*";
const auto * trigger_pattern_c = trigger_pattern.c_str();
trigger_patterns = &trigger_pattern_c;
num_trigger_patterns = 1;
std::array<const char *, 1> tmp_trigger_patterns = { trigger_pattern.c_str() };
grammar = llama_grammar_init_impl(vocab, grammar_str, grammar_root, lazy, tmp_trigger_patterns.data(), tmp_trigger_patterns.size(), trigger_tokens, num_trigger_tokens);
} else {
grammar = llama_grammar_init_impl(vocab, grammar_str, grammar_root, lazy, trigger_patterns, num_trigger_patterns, trigger_tokens, num_trigger_tokens);
}
*ctx = {
/* .vocab = */ vocab,
/* .grammar_str = */ grammar_str,
/* .grammar_root = */ grammar_root,
/* .grammar = */ llama_grammar_init_impl(vocab, grammar_str, grammar_root, lazy, trigger_patterns, num_trigger_patterns, trigger_tokens, num_trigger_tokens),
/* .grammar = */ grammar,
};
if (!ctx->grammar) {
delete ctx;