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[DebugInfo] Introduce DIEExpr variant of DIEValue to hold MCExpr values

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This partially reverts r185202 and restores DIELabel to hold plain
MCSymbol references.  Instead, we add a new subclass DIEExpr of
DIEValue that can hold generic MCExpr references.

This is in preparation for supporting debug info for TLS variables
on PowerPC, where we need to describe the variable location using
a more complex expression than just MCSymbolRefExpr.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185458 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand
2013-07-02 18:46:26 +00:00
parent 88328d2ff4
commit 1f8aacd6af
5 changed files with 80 additions and 21 deletions
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21
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
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@ -136,7 +136,7 @@ void CompileUnit::addString(DIE *Die, unsigned Attribute, StringRef String) {
MCSymbol *Symb = DU->getStringPoolEntry(String);
DIEValue *Value;
if (Asm->needsRelocationsForDwarfStringPool())
Value = new (DIEValueAllocator) DIELabel(Symb, Asm->OutContext);
Value = new (DIEValueAllocator) DIELabel(Symb);
else {
MCSymbol *StringPool = DU->getStringPoolSym();
Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
@ -156,7 +156,7 @@ void CompileUnit::addLocalString(DIE *Die, unsigned Attribute,
MCSymbol *Symb = DU->getStringPoolEntry(String);
DIEValue *Value;
if (Asm->needsRelocationsForDwarfStringPool())
Value = new (DIEValueAllocator) DIELabel(Symb, Asm->OutContext);
Value = new (DIEValueAllocator) DIELabel(Symb);
else {
MCSymbol *StringPool = DU->getStringPoolSym();
Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
@ -164,17 +164,20 @@ void CompileUnit::addLocalString(DIE *Die, unsigned Attribute,
Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
}
/// addLabel - Add a Dwarf label attribute data and value.
/// addExpr - Add a Dwarf expression attribute data and value.
///
void CompileUnit::addLabel(DIE *Die, unsigned Attribute, unsigned Form,
const MCSymbolRefExpr *Label) {
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
void CompileUnit::addExpr(DIE *Die, unsigned Attribute, unsigned Form,
const MCExpr *Expr) {
DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
Die->addValue(Attribute, Form, Value);
}
/// addLabel - Add a Dwarf label attribute data and value.
///
void CompileUnit::addLabel(DIE *Die, unsigned Attribute, unsigned Form,
const MCSymbol *Label) {
addLabel(Die, Attribute, Form, MCSymbolRefExpr::Create(Label, Asm->OutContext));
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
Die->addValue(Attribute, Form, Value);
}
/// addLabelAddress - Add a dwarf label attribute data and value using
@ -184,7 +187,7 @@ void CompileUnit::addLabelAddress(DIE *Die, unsigned Attribute,
MCSymbol *Label) {
if (!DD->useSplitDwarf()) {
if (Label != NULL) {
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label, Asm->OutContext);
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
} else {
DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
@ -1363,7 +1366,7 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
addUInt(Block, 0, dwarf::DW_FORM_data1,
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
// 2) containing the (relocated) address of the TLS variable
addLabel(Block, 0, dwarf::DW_FORM_udata, Ref);
addExpr(Block, 0, dwarf::DW_FORM_udata, Ref);
} else {
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
addUInt(Block, 0, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Ref));