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[dsymutil] Set linked unit start offset early. NFC.

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The start offset of a linked unit is known before starting to clone
its DIEs. Handling DW_FORM_ref_addr attributes requires that this
offset is set while cloning the unit. Split CompileUnit::computeOffsets()
into setStartOffset() and computeNextUnitOffset() and call them
repsectively before cloning the DIEs and right after.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231530 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Frederic Riss 2015-03-06 23:22:50 +00:00
parent 7557b1a4df
commit 1edd6edd60
1 changed files with 8 additions and 7 deletions
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15
tools/dsymutil/DwarfLinker.cpp
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@ -81,12 +81,13 @@ public:
uint64_t getStartOffset() const { return StartOffset; }
uint64_t getNextUnitOffset() const { return NextUnitOffset; }
/// \brief Set the start and end offsets for this unit. Must be
/// called after the CU's DIEs have been cloned. The unit start
/// offset will be set to \p DebugInfoSize.
void setStartOffset(uint64_t DebugInfoSize) { StartOffset = DebugInfoSize; }
/// \brief Compute the end offset for this unit. Must be
/// called after the CU's DIEs have been cloned.
/// \returns the next unit offset (which is also the current
/// debug_info section size).
uint64_t computeOffsets(uint64_t DebugInfoSize);
uint64_t computeNextUnitOffset();
private:
DWARFUnit &OrigUnit;
@ -97,8 +98,7 @@ private:
uint64_t NextUnitOffset;
};
uint64_t CompileUnit::computeOffsets(uint64_t DebugInfoSize) {
StartOffset = DebugInfoSize;
uint64_t CompileUnit::computeNextUnitOffset() {
NextUnitOffset = StartOffset + 11 /* Header size */;
// The root DIE might be null, meaning that the Unit had nothing to
// contribute to the linked output. In that case, we will emit the
@ -1307,10 +1307,11 @@ bool DwarfLinker::link(const DebugMap &Map) {
if (!ValidRelocs.empty())
for (auto &CurrentUnit : Units) {
const auto *InputDIE = CurrentUnit.getOrigUnit().getCompileUnitDIE();
CurrentUnit.setStartOffset(OutputDebugInfoSize);
DIE *OutputDIE =
cloneDIE(*InputDIE, CurrentUnit, 11 /* Unit Header size */);
CurrentUnit.setOutputUnitDIE(OutputDIE);
OutputDebugInfoSize = CurrentUnit.computeOffsets(OutputDebugInfoSize);
OutputDebugInfoSize = CurrentUnit.computeNextUnitOffset();
}
// Emit all the compile unit's debug information.