[MC] Add support for encoding CodeView variable definition ranges
CodeView, like most other debug formats, represents the live range of a
variable so that debuggers might print them out.
They use a variety of records to represent how a particular variable
might be available (in a register, in a frame pointer, etc.) along with
a set of ranges where this debug information is relevant.
However, the format only allows us to use ranges which are limited to a
maximum of 0xF000 in size. This means that we need to split our debug
information into chunks of 0xF000.
Because the layout of code is not known until *very* late, we must use a
new fragment to record the information we need until we can know
*exactly* what the range is.
llvm-svn: 259868
diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
index 9fcfcf7..c615752 100644
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -209,6 +209,9 @@
unsigned PrimaryFunctionId, unsigned SourceFileId, unsigned SourceLineNum,
const MCSymbol *FnStartSym, const MCSymbol *FnEndSym,
ArrayRef<unsigned> SecondaryFunctionIds) override;
+ void EmitCVDefRangeDirective(
+ ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
+ StringRef FixedSizePortion) override;
void EmitCVStringTableDirective() override;
void EmitCVFileChecksumsDirective() override;
@@ -1038,6 +1041,22 @@
SecondaryFunctionIds);
}
+void MCAsmStreamer::EmitCVDefRangeDirective(
+ ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
+ StringRef FixedSizePortion) {
+ OS << "\t.cv_def_range\t";
+ for (std::pair<const MCSymbol *, const MCSymbol *> Range : Ranges) {
+ OS << ' ';
+ Range.first->print(OS, MAI);
+ OS << ' ';
+ Range.second->print(OS, MAI);
+ }
+ OS << ", ";
+ PrintQuotedString(FixedSizePortion, OS);
+ EmitEOL();
+ this->MCStreamer::EmitCVDefRangeDirective(Ranges, FixedSizePortion);
+}
+
void MCAsmStreamer::EmitCVStringTableDirective() {
OS << "\t.cv_stringtable";
EmitEOL();