[StackMaps] Add a lightweight parser for stackmap version 1 sections.
The parser provides a convenient interface for reading llvm stackmap v1 sections
in object files.
This patch also includes a new option for llvm-readobj, '-stackmap', which uses
the parser to pretty-print stackmap sections for debugging/testing purposes.
llvm-svn: 240860
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 630f0ee..4efd8cb 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -17,6 +17,7 @@
#include "ARMEHABIPrinter.h"
#include "Error.h"
#include "ObjDumper.h"
+#include "StackMapPrinter.h"
#include "StreamWriter.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
@@ -61,6 +62,8 @@
void printMipsABIFlags() override;
void printMipsReginfo() override;
+ void printStackMap() const override;
+
private:
typedef ELFFile<ELFT> ELFO;
typedef typename ELFO::Elf_Shdr Elf_Shdr;
@@ -1494,3 +1497,25 @@
W.printHex("Co-Proc Mask2", Reginfo->ri_cprmask[2]);
W.printHex("Co-Proc Mask3", Reginfo->ri_cprmask[3]);
}
+
+template <class ELFT> void ELFDumper<ELFT>::printStackMap() const {
+ const typename ELFFile<ELFT>::Elf_Shdr *StackMapSection = nullptr;
+ for (const auto &Sec : Obj->sections()) {
+ ErrorOr<StringRef> Name = Obj->getSectionName(&Sec);
+ if (*Name == ".llvm_stackmaps") {
+ StackMapSection = &Sec;
+ break;
+ }
+ }
+
+ if (!StackMapSection)
+ return;
+
+ StringRef StackMapContents;
+ ErrorOr<ArrayRef<uint8_t>> StackMapContentsArray =
+ Obj->getSectionContents(StackMapSection);
+
+ prettyPrintStackMap(
+ llvm::outs(),
+ StackMapV1Parser<ELFT::TargetEndianness>(*StackMapContentsArray));
+}