<div class="doc_text">
<p>The call instructions that wrap inline asm nodes may have a "!srcloc" MDNode
- attached to it that contains a constant integer. If present, the code
- generator will use the integer as the location cookie value when report
+ attached to it that contains a list of constant integers. If present, the
+ code generator will use the integer as the location cookie value when report
errors through the LLVMContext error reporting mechanisms. This allows a
front-end to correlate backend errors that occur with inline asm back to the
source code that produced it. For example:</p>
</pre>
<p>It is up to the front-end to make sense of the magic numbers it places in the
- IR.</p>
+ IR. If the MDNode contains multiple constants, the code generator will use
+ the one that corresponds to the line of the asm that the error occurs on.</p>
</div>
SrcMgrDiagInfo *DiagInfo = static_cast<SrcMgrDiagInfo *>(diagInfo);
assert(DiagInfo && "Diagnostic context not passed down?");
+ // If the inline asm had metadata associated with it, pull out a location
+ // cookie corresponding to which line the error occurred on.
unsigned LocCookie = 0;
- if (const MDNode *LocInfo = DiagInfo->LocInfo)
- if (LocInfo->getNumOperands() > 0)
- if (const ConstantInt *CI = dyn_cast<ConstantInt>(LocInfo->getOperand(0)))
+ if (const MDNode *LocInfo = DiagInfo->LocInfo) {
+ unsigned ErrorLine = Diag.getLineNo()-1;
+ if (ErrorLine >= LocInfo->getNumOperands())
+ ErrorLine = 0;
+
+ if (LocInfo->getNumOperands() != 0)
+ if (const ConstantInt *CI =
+ dyn_cast<ConstantInt>(LocInfo->getOperand(ErrorLine)))
LocCookie = CI->getZExtValue();
+ }
DiagInfo->DiagHandler(Diag, DiagInfo->DiagContext, LocCookie);
}