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Output floating point representations in DWARF format. This is done by outputing

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the FP encoding directly as a hex representation.

llvm-svn: 100487
This commit is contained in:
Bill Wendling 2010-04-05 22:59:21 +00:00
parent cf8b0d4228
commit bf50ddf6ac
1 changed files with 26 additions and 0 deletions
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26
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -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"
@ -1529,6 +1530,31 @@ DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) {
unsigned Imm = DbgValueInsn->getOperand(0).getImm();
addUInt(Block, 0, dwarf::DW_FORM_udata, Imm);
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 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);