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// -*- C++ -*-
// Copyright (C) 2008-2014 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#ifndef DWARF_WRAPPERS_H
#define DWARF_WRAPPERS_H 1
#include "config.h"
extern "C" {
#include <elfutils/libdw.h>
#include <elfutils/version.h>
#include <dwarf.h>
}
#include <string>
#if ! _ELFUTILS_PREREQ(0, 148)
#define DW_AT_linkage_name 0x6e
#endif
#if ! _ELFUTILS_PREREQ(0, 153)
#define DW_TAG_GNU_call_site 0x4109
#define DW_AT_GNU_tail_call 0x2115
#endif
#if ! _ELFUTILS_PREREQ(0, 155)
#define DW_ATE_UTF 0x10
#endif
#define DWFL_ASSERT(desc, arg) \
dwfl_assert(desc, arg, __FILE__, __LINE__)
// NB: "rc == 0" means OK in this case
void dwfl_assert(const std::string& desc, int rc,
const std::string& file, int line);
// Throw error if pointer is NULL
inline void
dwfl_assert(const std::string& desc, const void* ptr,
const std::string& file, int line)
{
if (!ptr)
dwfl_assert(desc, -1, file, line);
}
// Throw error if condition is false
inline void
dwfl_assert(const std::string& desc, bool condition,
const std::string& file, int line)
{
if (!condition)
dwfl_assert(desc, -1, file, line);
}
#define DWARF_ASSERT(desc, arg) \
dwarf_assert(desc, arg, __FILE__, __LINE__)
// NB: "rc == 0" means OK in this case
void dwarf_assert(const std::string& desc, int rc,
const std::string& file, int line);
// Throw error if pointer is NULL
inline void
dwarf_assert(const std::string& desc, const void* ptr,
const std::string& file, int line)
{
if (!ptr)
dwarf_assert(desc, -1, file, line);
}
#define DWARF_LINENO(line) \
safe_dwarf_lineno(line, __FILE__, __LINE__)
inline int
safe_dwarf_lineno(const Dwarf_Line* line,
const std::string& errfile, int errline)
{
int lineno;
dwarf_assert("dwarf_lineno",
dwarf_lineno(const_cast<Dwarf_Line*>(line), &lineno),
errfile, errline);
return lineno;
}
#define DWARF_LINEADDR(line) \
safe_dwarf_lineaddr(line, __FILE__, __LINE__)
inline Dwarf_Addr
safe_dwarf_lineaddr(const Dwarf_Line* line,
const std::string& errfile, int errline)
{
Dwarf_Addr addr;
dwarf_assert("dwarf_lineaddr",
dwarf_lineaddr(const_cast<Dwarf_Line*>(line), &addr),
errfile, errline);
return addr;
}
#define DWARF_LINESRC(line) \
safe_dwarf_linesrc(line, NULL, NULL, __FILE__, __LINE__)
#define DWARF_LINESRC2(line, mtime) \
safe_dwarf_linesrc(line, mtime, NULL, __FILE__, __LINE__)
#define DWARF_LINESRC3(line, mtime, length) \
safe_dwarf_linesrc(line, mtime, length, __FILE__, __LINE__)
inline const char*
safe_dwarf_linesrc(const Dwarf_Line* line,
Dwarf_Word* mtime,
Dwarf_Word* length,
const std::string& errfile, int errline)
{
const char* linesrc =
dwarf_linesrc(const_cast<Dwarf_Line*>(line), mtime, length);
dwarf_assert("dwarf_linesrc", linesrc, errfile, errline);
return linesrc;
}
#define DWARF_LINEPROLOGUEEND(line) \
safe_dwarf_lineprologueend(line, __FILE__, __LINE__)
inline bool
safe_dwarf_lineprologueend(const Dwarf_Line* line,
const std::string& errfile, int errline)
{
bool flag;
dwarf_assert("is_prologue_end",
dwarf_lineprologueend(const_cast<Dwarf_Line*>(line), &flag),
errfile, errline);
return flag;
}
// Look up the DIE for a reference-form attribute name
inline Dwarf_Die *
dwarf_attr_die (Dwarf_Die *die, unsigned int attr, Dwarf_Die *result)
{
Dwarf_Attribute attr_mem;
if (dwarf_formref_die (dwarf_attr_integrate (die, attr, &attr_mem),
result) != NULL)
{
/* If we want a type make sure we get the actual DIE describing
the real type. */
if (attr == DW_AT_type)
{
Dwarf_Attribute sigm;
Dwarf_Attribute *sig = dwarf_attr (result, DW_AT_signature, &sigm);
if (sig != NULL)
result = dwarf_formref_die (sig, result);
/* A DW_AT_signature might point to a type_unit, then
the actual type DIE we want is the first child. */
if (result != NULL && dwarf_tag (result) == DW_TAG_type_unit)
DWFL_ASSERT("type_unit child", dwarf_child (result, result));
}
return result;
}
return NULL;
}
// Retrieve the linkage name of a die, either by the MIPS vendor extension or
// DWARF4's standardized attribute.
inline const char *
dwarf_linkage_name (Dwarf_Die *die)
{
Dwarf_Attribute attr_mem;
return dwarf_formstring
(dwarf_attr_integrate (die, DW_AT_MIPS_linkage_name, &attr_mem)
?: dwarf_attr_integrate (die, DW_AT_linkage_name, &attr_mem));
}
#if !_ELFUTILS_PREREQ(0, 143)
// Elfutils prior to 0.143 didn't use attr_integrate when looking up the
// decl_file or decl_line, so the attributes would sometimes be missed. For
// those old versions, we define custom implementations to do the integration.
const char *dwarf_decl_file_integrate (Dwarf_Die *die);
#define dwarf_decl_file dwarf_decl_file_integrate
int dwarf_decl_line_integrate (Dwarf_Die *die, int *linep)
__nonnull_attribute__ (2);
#define dwarf_decl_line dwarf_decl_line_integrate
#endif // !_ELFUTILS_PREREQ(0, 143)
// Resolve a C declaration for dwarf types
bool dwarf_type_decl(Dwarf_Die *type_die, const std::string& var_name, std::string& decl);
// Resolve a full name for dwarf types
bool dwarf_type_name(Dwarf_Die *type_die, std::string& type_name);
std::string dwarf_type_name(Dwarf_Die *type_die);
#endif
/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
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