void SourceMapGenerator::setDebugLoc(const llvm::DebugLoc& debugLoc)
{
if(!sourceMap)
return;
if(!lineStart)
{
//TODO: Support multi-segment
}
else
{
// Start a new line
MDNode* file = debugLoc.getScope(Ctx);
assert(file->getNumOperands()>=2);
MDNode* fileNamePath = cast<MDNode>(file->getOperand(1));
assert(fileNamePath->getNumOperands()==2);
MDString* fileNameString = cast<MDString>(fileNamePath->getOperand(0));
auto fileMapIt = fileMap.find(fileNameString);
if (fileMapIt == fileMap.end())
fileMapIt = fileMap.insert(std::make_pair(fileNameString, fileMap.size())).first;
uint32_t currentFile = fileMapIt->second;
uint32_t currentLine = debugLoc.getLine() - 1;
uint32_t currentColoumn = debugLoc.getCol();
// Starting coloumn in the generated code
writeBase64VLQInt(0);
// Other fields are encoded as difference from the previous one in the file
// We can use the last value directly because it is initialized as 0
// File index
writeBase64VLQInt(currentFile - lastFile);
// Line index
writeBase64VLQInt(currentLine - lastLine);
// Coloumn index
writeBase64VLQInt(currentColoumn - lastColoumn);
lastFile = currentFile;
lastLine = currentLine;
lastColoumn = currentColoumn;
}
lineStart = false;
}
// @brief Lexicographic order on (line, col) of our debug locations.
static bool operator<(const llvm::DebugLoc &LHS, const llvm::DebugLoc &RHS) {
return LHS.getLine() < RHS.getLine() ||
(LHS.getLine() == RHS.getLine() && LHS.getCol() < RHS.getCol());
}