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Have the inst emitter add the !srcloc mdnode to the machine instr.
Have the asmprinter use the mdnode to scavenge a source location if present. Document this nonsense in langref. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100607 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2516,6 +2516,31 @@ call void asm alignstack "eieio", ""()
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documented here. Constraints on what can be done (e.g. duplication, moving,
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etc need to be documented). This is probably best done by reference to
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another document that covers inline asm from a holistic perspective.</p>
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</div>
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<div class="doc_subsubsection">
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<a name="inlineasm_md">Inline Asm Metadata</a>
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</div>
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<div class="doc_text">
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<p>The call instructions that wrap inline asm nodes may have a "!srcloc" MDNode
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attached to it that contains a constant integer. If present, the code
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generator will use the integer as the location cookie value when report
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errors through the LLVMContext error reporting mechanisms. This allows a
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front-end to corrolate backend errors that occur with inline asm back to the
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source code that produced it. For example:</p>
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<div class="doc_code">
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<pre>
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call void asm sideeffect "something bad", ""()<b>, !srcloc !42</b>
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...
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!42 = !{ i32 1234567 }
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</pre>
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</div>
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<p>It is up to the front-end to make sense of the magic numbers it places in the
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IR.</p>
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</div>
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@ -13,6 +13,7 @@
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#define DEBUG_TYPE "asm-printer"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/Constants.h"
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#include "llvm/InlineAsm.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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@ -97,7 +98,7 @@ void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
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unsigned NumDefs = 0;
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for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
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++NumDefs)
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assert(NumDefs != NumOperands-1 && "No asm string?");
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assert(NumDefs != NumOperands-2 && "No asm string?");
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assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
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@ -123,6 +124,15 @@ void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
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OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
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MAI->getInlineAsmStart());
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// Get the !srcloc metadata node if we have it, and decode the loc cookie from
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// it.
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unsigned LocCookie = 0;
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if (const MDNode *SrcLoc = MI->getOperand(NumOperands-1).getMetadata()) {
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if (SrcLoc->getNumOperands() != 0)
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(SrcLoc->getOperand(0)))
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LocCookie = CI->getZExtValue();
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}
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// Emit the inline asm to a temporary string so we can emit it through
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// EmitInlineAsm.
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SmallString<256> StringData;
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@ -295,7 +305,7 @@ void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
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}
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}
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OS << '\n' << (char)0; // null terminate string.
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EmitInlineAsm(OS.str(), 0/*no loc cookie*/);
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EmitInlineAsm(OS.str(), LocCookie);
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// Emit the #NOAPP end marker. This has to happen even if verbose-asm isn't
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// enabled, so we use EmitRawText.
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@ -769,6 +769,12 @@ EmitSpecialNode(SDNode *Node, bool IsClone, bool IsCloned,
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break;
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}
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}
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// Get the mdnode from the asm if it exists and add it to the instruction.
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SDValue MDV = Node->getOperand(InlineAsm::Op_MDNode);
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const MDNode *MD = cast<MDNodeSDNode>(MDV)->getMD();
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MI->addOperand(MachineOperand::CreateMetadata(MD));
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MBB->insert(InsertPos, MI);
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break;
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}
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