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Split address information for DWARF5 split dwarf proposal. This involves

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using the DW_FORM_GNU_addr_index and a separate .debug_addr section which
stays in the executable and is fully linked.

Sneak in two other small changes:

a) Print out the debug_str_offsets.dwo section.
b) Change form we're expecting the entries in the debug_str_offsets.dwo
   section to take from ULEB128 to U32.

Add tests for all of this in the fission-cu.ll test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172578 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2013-01-15 23:56:56 +00:00
parent af50dda410
commit 72f7bfbf0e
13 changed files with 204 additions and 28 deletions
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25
lib/CodeGen/AsmPrinter/DwarfDebug.h
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@@ -195,6 +195,10 @@ public:
typedef StringMap<std::pair<MCSymbol*, unsigned>,
BumpPtrAllocator&> StrPool;
// A Symbol->pair<Symbol, unsigned> mapping of addresses used by indirect
// references.
typedef DenseMap<MCSymbol *, std::pair<MCSymbol *, unsigned> > AddrPool;
/// \brief Collects and handles information specific to a particular
/// collection of units.
class DwarfUnits {
@@ -215,12 +219,17 @@ class DwarfUnits {
unsigned NextStringPoolNumber;
std::string StringPref;
// Collection of addresses for this unit and assorted labels.
AddrPool AddressPool;
unsigned NextAddrPoolNumber;
public:
DwarfUnits(AsmPrinter *AP, FoldingSet<DIEAbbrev> *AS,
std::vector<DIEAbbrev *> *A, const char *Pref,
BumpPtrAllocator &DA) :
Asm(AP), AbbreviationsSet(AS), Abbreviations(A),
StringPool(DA), NextStringPoolNumber(0), StringPref(Pref) {}
StringPool(DA), NextStringPoolNumber(0), StringPref(Pref),
AddressPool(), NextAddrPoolNumber(0) {}
/// \brief Compute the size and offset of a DIE given an incoming Offset.
unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
@@ -242,6 +251,9 @@ public:
/// \brief Emit all of the strings to the section given.
void emitStrings(const MCSection *, const MCSection *, const MCSymbol *);
/// \brief Emit all of the addresses to the section given.
void emitAddresses(const MCSection *);
/// \brief Returns the entry into the start of the pool.
MCSymbol *getStringPoolSym();
@@ -255,6 +267,13 @@ public:
/// \brief Returns the string pool.
StrPool *getStringPool() { return &StringPool; }
/// \brief Returns the index into the address pool with the given
/// label/symbol.
unsigned getAddrPoolIndex(MCSymbol *);
/// \brief Returns the address pool.
AddrPool *getAddrPool() { return &AddressPool; }
};
/// \brief Collects and handles dwarf debug information.
@@ -560,7 +579,7 @@ private:
}
/// \brief Return Label preceding the instruction.
const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
/// \brief Ensure that a label will be emitted after MI.
void requestLabelAfterInsn(const MachineInstr *MI) {
@@ -568,7 +587,7 @@ private:
}
/// \brief Return Label immediately following the instruction.
const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
public:
//===--------------------------------------------------------------------===//