Sketch out a DWARF parser.
This introduces a new library to LLVM: libDebugInfo. It will provide debug information
parsing to LLVM. Much of the design and some of the code is taken from the LLDB project.
It also contains an llvm-dwarfdump tool that can dump the abbrevs and DIEs from an
object file. It can be used to write tests for DWARF input and output easily.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139627 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFFormValue.h b/lib/DebugInfo/DWARFFormValue.h
new file mode 100644
index 0000000..c2bfb4f
--- /dev/null
+++ b/lib/DebugInfo/DWARFFormValue.h
@@ -0,0 +1,79 @@
+//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_DWARFFORMVALUE_H
+#define LLVM_DEBUGINFO_DWARFFORMVALUE_H
+
+#include "llvm/Support/DataExtractor.h"
+
+namespace llvm {
+
+class DWARFCompileUnit;
+class raw_ostream;
+
+class DWARFFormValue {
+public:
+ struct ValueType {
+ ValueType() : data(NULL) {
+ uval = 0;
+ }
+
+ union {
+ uint64_t uval;
+ int64_t sval;
+ const char* cstr;
+ };
+ const uint8_t* data;
+ };
+
+ enum {
+ eValueTypeInvalid = 0,
+ eValueTypeUnsigned,
+ eValueTypeSigned,
+ eValueTypeCStr,
+ eValueTypeBlock
+ };
+
+private:
+ uint16_t Form; // Form for this value.
+ ValueType Value; // Contains all data for the form.
+
+public:
+ DWARFFormValue(uint16_t form = 0) : Form(form) {}
+ uint16_t getForm() const { return Form; }
+ const ValueType& value() const { return Value; }
+ void dump(raw_ostream &OS, const DataExtractor *debug_str_data,
+ const DWARFCompileUnit* cu) const;
+ bool extractValue(DataExtractor data, uint32_t *offset_ptr,
+ const DWARFCompileUnit *cu);
+ bool isInlinedCStr() const {
+ return Value.data != NULL && Value.data == (uint8_t*)Value.cstr;
+ }
+ const uint8_t *BlockData() const;
+ uint64_t getReference(const DWARFCompileUnit* cu) const;
+
+ /// Resolve any compile unit specific references so that we don't need
+ /// the compile unit at a later time in order to work with the form
+ /// value.
+ bool resolveCompileUnitReferences(const DWARFCompileUnit* cu);
+ uint64_t getUnsigned() const { return Value.uval; }
+ int64_t getSigned() const { return Value.sval; }
+ const char *getAsCString(const DataExtractor *debug_str_data_ptr) const;
+ bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr,
+ const DWARFCompileUnit *cu) const;
+ static bool skipValue(uint16_t form, DataExtractor debug_info_data,
+ uint32_t *offset_ptr, const DWARFCompileUnit *cu);
+ static bool isBlockForm(uint16_t form);
+ static bool isDataForm(uint16_t form);
+ static const uint8_t *getFixedFormSizesForAddressSize(uint8_t addr_size);
+};
+
+}
+
+#endif