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Debug Info: support for DW_FORM_ref_addr.

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To support ref_addr, we calculate the section offset of a DIE (i.e. offset
of a DIE from beginning of the debug info section). The Offset field in DIE
is currently CU-relative. To calculate the section offset, we add a
DebugInfoOffset field in CompileUnit to store the offset of a CU from beginning
of the debug info section. We set the value in DwarfUnits::computeSizeAndOffset
for each CompileUnit.

A helper function DIE::getCompileUnit is added to return the CU DIE that
the input DIE belongs to. We also add a map CUDieMap in DwarfDebug to help
finding the CU for a given CU DIE.

For a cross-referenced DIE, we first find the CU DIE it belongs to with
getCompileUnit, then we use CUDieMap to get the corresponding CU for the CU DIE.
Adding the section offset of the CU with the CU-relative offset of a DIE gives
us the seciton offset of the DIE.

We correctly emit ref_addr with relocation using EmitLabelPlusOffset when
doesDwarfUseRelocationsAcrossSections is true.

This commit handles the emission of DW_FORM_ref_addr when we have an attribute
with FORM_ref_addr. A follow-on patch will start using ref_addr when adding a
DIEEntry. This commit will be tested and verified in the follow-on patch.

Reviewed off-list by Eric, Thanks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193658 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2013-10-29 22:57:10 +00:00
parent d498e5e960
commit 3eabc2adb7
6 changed files with 67 additions and 3 deletions
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6
lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
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@@ -120,6 +120,9 @@ public:
return AccelTypes;
}
unsigned getDebugInfoOffset() const { return DebugInfoOffset; }
void setDebugInfoOffset(unsigned DbgInfoOff) { DebugInfoOffset = DbgInfoOff; }
/// hasContent - Return true if this compile unit has something to write out.
///
bool hasContent() const { return !CUDie->getChildren().empty(); }
@@ -347,6 +350,9 @@ private:
/// getOrCreateStaticMemberDIE - Create new static data member DIE.
DIE *getOrCreateStaticMemberDIE(DIDerivedType DT);
/// Offset of the CUDie from beginning of debug info section.
unsigned DebugInfoOffset;
/// getLowerBoundDefault - Return the default lower bound for an array. If the
/// DWARF version doesn't handle the language, return -1.
int64_t getDefaultLowerBound() const;