[llvm-commits] [llvm] r100487 - /llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

[Chris Lattner]

On Apr 5, 2010, at 3:59 PM, Bill Wendling wrote:

> Author: void
> Date: Mon Apr  5 17:59:21 2010
> New Revision: 100487
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=100487&view=rev
> Log:
> Output floating point representations in DWARF format. This is done by outputing
> the FP encoding directly as a hex representation.

Did you verify that this works on both big and little endian systems?

-Chris

> 
> Modified:
>    llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> 
> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=100487&r1=100486&r2=100487&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Mon Apr  5 17:59:21 2010
> @@ -14,6 +14,7 @@
> #define DEBUG_TYPE "dwarfdebug"
> #include "DwarfDebug.h"
> #include "DIE.h"
> +#include "llvm/Constants.h"
> #include "llvm/Module.h"
> #include "llvm/CodeGen/MachineFunction.h"
> #include "llvm/CodeGen/MachineModuleInfo.h"
> @@ -1532,6 +1533,31 @@
>           if (MCSymbol *VS = DV->getDbgValueLabel())
>             addLabel(VariableDie, dwarf::DW_AT_start_scope, dwarf::DW_FORM_addr,
>                      VS);
> +        } else if (DbgValueInsn->getOperand(0).getType() == 
> +                   MachineOperand::MO_FPImmediate) {
> +          DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
> +          APFloat FPImm = DbgValueInsn->getOperand(0).getFPImm()->getValueAPF();
> +
> +          // Get the raw data form of the floating point.
> +          const APInt FltVal = FPImm.bitcastToAPInt();
> +          const char *FltPtr = (const char*)FltVal.getRawData();
> +
> +          unsigned NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
> +          bool LittleEndian = Asm->getTargetData().isLittleEndian();
> +          int Incr = (LittleEndian ? 1 : -1);
> +          int Start = (LittleEndian ? 0 : NumBytes - 1);
> +          int Stop = (LittleEndian ? NumBytes : -1);
> +
> +          // Output the constant to DWARF one byte at a time.
> +          for (; Start != Stop; Start += Incr)
> +            addUInt(Block, 0, dwarf::DW_FORM_data1,
> +                    (unsigned char)0xFF & FltPtr[Start]);
> +
> +          addBlock(VariableDie, dwarf::DW_AT_const_value, 0, Block);
> +
> +          if (MCSymbol *VS = DV->getDbgValueLabel())
> +            addLabel(VariableDie, dwarf::DW_AT_start_scope, dwarf::DW_FORM_addr,
> +                     VS);
>         } else {
>           //FIXME : Handle other operand types.
>           delete VariableDie;
> 
> 
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