6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-24 08:24:33 +00:00
Code Issues Projects Releases Wiki Activity

Fix debug info for merged global.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123862 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2011-01-20 00:02:16 +00:00
parent fc7d775178
commit e449d1f189
2 changed files with 166 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -16,6 +16,7 @@
#include "DIE.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/Instructions.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/MC/MCAsmInfo.h"
@ -1922,6 +1923,32 @@ static bool isUnsignedDIType(DIType Ty) {
return false;
}
// Return const exprssion if value is a GEP to access merged global
// constant. e.g.
// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
if (!CE || CE->getNumOperands() != 3 ||
CE->getOpcode() != Instruction::GetElementPtr)
return NULL;
// First operand points to a global value.
if (!isa<GlobalValue>(CE->getOperand(0)))
return NULL;
// Second operand is zero.
const ConstantInt *CI =
dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
if (!CI || !CI->isZero())
return NULL;
// Third operand is offset.
if (!isa<ConstantInt>(CE->getOperand(2)))
return NULL;
return CE;
}
/// constructGlobalVariableDIE - Construct global variable DIE.
void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) {
DIGlobalVariable GV(N);
@ -1991,6 +2018,18 @@ void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) {
} else if (ConstantInt *CI =
dyn_cast_or_null<ConstantInt>(GV.getConstant()))
addConstantValue(VariableDIE, CI, isUnsignedDIType(GTy));
else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
// GV is a merged global.
DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
addLabel(Block, 0, dwarf::DW_FORM_udata,
Asm->Mang->getSymbol(cast<GlobalValue>(CE->getOperand(0))));
ConstantInt *CII = cast<ConstantInt>(CE->getOperand(2));
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
addUInt(Block, 0, dwarf::DW_FORM_udata, CII->getZExtValue());
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
}
return;
}