[LLVMdev] Fwd: Extending Kaleidoscope to support Strings

Richard Catlin richard.m.catlin at gmail.com
Mon Mar 25 17:14:52 PDT 2013

I hope this is the right place to ask this question.  If not, please let me
know where I can ask for help.

We are using Kaleidoscope as the base framework to write a source to source
compiler.  Our source language has Strings with supported operations such
as concatenation, upper case, and substrings.

I am following the patterns set forth in Kaleidoscope, and need to
represent my std::string as a Value *.

I have:

Value *StringExprAST::Codegen() {
  StringRef r(Val);  // Val is a std::string captured by the parser
  return ConstantDataArray::getString(getGlobalContext(), r);

For a test string of "Hello World!", I am trying to create an Alloca * and
store the InitVal, which I get from codegen of StringExprAST.

uint64_t v(13);
APInt d(8, v);
Value * ArraySize = ConstantInt::get(getGlobalContext(), d);
Alloca = CreateEntryBlockAllocaString(TheFunction, VarName, ArraySize);
Builder.CreateStore(InitVal, Alloca);

I get the following error:
tok_string: "Hello World!"
Assertion failed: (getOperand(0)->getType() ==
cast<PointerType>(getOperand(1)->getType())->getElementType() && "Ptr must
be a pointer to Val type!"), function AssertOK, file
/Users/rcatlin1/lldb/llvm/lib/IR/Instructions.cpp, line 1089.

Thanks for any guidance.

Richard Catlin
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