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Fix access violation in JIT when printing long string literals #122460

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Merged
jkotas merged 7 commits into from
Dec 12, 2025
Merged

Fix access violation in JIT when printing long string literals #122460

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bf3fa76
Initial plan
Copilot Dec 11, 2025
8cd34b0
Fix access violation in JIT when printing long string literals
Copilot Dec 11, 2025
aee42d8
Update src/coreclr/inc/corinfo.h
jkotas Dec 11, 2025
0aca6a5
Update src/coreclr/inc/corinfo.h
jkotas Dec 11, 2025
62c2ae3
Change MAX_LITERAL_LENGTH to 50 and adjust dst buffer size
Copilot Dec 12, 2025
2f4d3c7
Use MAX_LITERAL_LENGTH instead of hardcoded 50 in printf
Copilot Dec 12, 2025
856eb87
Simplify printf to use %s instead of %.*s
Copilot Dec 12, 2025
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5 changes: 4 additions & 1 deletion src/coreclr/inc/corinfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2377,7 +2377,10 @@ class ICorStaticInfo
CORINFO_RESOLVED_TOKEN * pResolvedToken /* IN */) = 0;

// Returns (sub)string length and content (can be null for dynamic context)
// for given metaTOK and module, length `-1` means input is incorrect
// for given metaTOK and module, length `-1` means input is incorrect.
//
// Return value: The actual length of the (sub)string. Note that this may be larger
// than bufferSize, in which case only bufferSize characters are copied to buffer.
virtual int getStringLiteral (
CORINFO_MODULE_HANDLE module, /* IN */
unsigned metaTOK, /* IN */
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10 changes: 6 additions & 4 deletions src/coreclr/jit/eeinterface.cpp
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Expand Up @@ -705,7 +705,7 @@ void Compiler::eePrintObjectDescription(const char* prefix, CORINFO_OBJECT_HANDL
//
void Compiler::eePrintStringLiteral(CORINFO_MODULE_HANDLE module, unsigned token)
{
const int MAX_LITERAL_LENGTH = 256;
const int MAX_LITERAL_LENGTH = 50;
char16_t str[MAX_LITERAL_LENGTH] = {};
int length = -1;
eeRunFunctorWithSPMIErrorTrap([&]() {
Expand All @@ -718,9 +718,11 @@ void Compiler::eePrintStringLiteral(CORINFO_MODULE_HANDLE module, unsigned token
}
else
{
char dst[MAX_LITERAL_LENGTH];
convertUtf16ToUtf8ForPrinting(str, length, dst, MAX_LITERAL_LENGTH);
printf("\"%.50s%s\"", dst, length > 50 ? "..." : "");
char dst[MAX_LITERAL_LENGTH * 3 + 1];
// Truncate length to MAX_LITERAL_LENGTH since that's the maximum we copied into str
int truncatedLength = min(length, MAX_LITERAL_LENGTH);
convertUtf16ToUtf8ForPrinting(str, truncatedLength, dst, sizeof(dst));
printf("\"%s%s\"", dst, length > MAX_LITERAL_LENGTH ? "..." : "");
}
}
#endif // DEBUG
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