forked from OSchip/llvm-project
367 lines
16 KiB
C++
367 lines
16 KiB
C++
//===-- sanitizer/common_interface_defs.h -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Common part of the public sanitizer interface.
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_COMMON_INTERFACE_DEFS_H
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#define SANITIZER_COMMON_INTERFACE_DEFS_H
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#include <stddef.h>
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#include <stdint.h>
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// GCC does not understand __has_feature.
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#if !defined(__has_feature)
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#define __has_feature(x) 0
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Arguments for __sanitizer_sandbox_on_notify() below.
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typedef struct {
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// Enable sandbox support in sanitizer coverage.
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int coverage_sandboxed;
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// File descriptor to write coverage data to. If -1 is passed, a file will
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// be pre-opened by __sanitizer_sandbox_on_notify(). This field has no
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// effect if coverage_sandboxed == 0.
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intptr_t coverage_fd;
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// If non-zero, split the coverage data into well-formed blocks. This is
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// useful when coverage_fd is a socket descriptor. Each block will contain
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// a header, allowing data from multiple processes to be sent over the same
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// socket.
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unsigned int coverage_max_block_size;
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} __sanitizer_sandbox_arguments;
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// Tell the tools to write their reports to "path.<pid>" instead of stderr.
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void __sanitizer_set_report_path(const char *path);
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// Tell the tools to write their reports to the provided file descriptor
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// (casted to void *).
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void __sanitizer_set_report_fd(void *fd);
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// Get the current full report file path, if a path was specified by
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// an earlier call to __sanitizer_set_report_path. Returns null otherwise.
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const char *__sanitizer_get_report_path();
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// Notify the tools that the sandbox is going to be turned on. The reserved
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// parameter will be used in the future to hold a structure with functions
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// that the tools may call to bypass the sandbox.
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void __sanitizer_sandbox_on_notify(__sanitizer_sandbox_arguments *args);
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// This function is called by the tool when it has just finished reporting
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// an error. 'error_summary' is a one-line string that summarizes
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// the error message. This function can be overridden by the client.
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void __sanitizer_report_error_summary(const char *error_summary);
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// Some of the sanitizers (for example ASan/TSan) could miss bugs that happen
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// in unaligned loads/stores. To find such bugs reliably, you need to replace
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// plain unaligned loads/stores with these calls.
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/// Loads a 16-bit unaligned value.
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///
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/// \param p Pointer to unaligned memory.
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///
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/// \returns Loaded value.
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uint16_t __sanitizer_unaligned_load16(const void *p);
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/// Loads a 32-bit unaligned value.
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///
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/// \param p Pointer to unaligned memory.
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///
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/// \returns Loaded value.
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uint32_t __sanitizer_unaligned_load32(const void *p);
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/// Loads a 64-bit unaligned value.
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///
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/// \param p Pointer to unaligned memory.
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///
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/// \returns Loaded value.
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uint64_t __sanitizer_unaligned_load64(const void *p);
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/// Stores a 16-bit unaligned value.
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///
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/// \param p Pointer to unaligned memory.
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/// \param x 16-bit value to store.
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void __sanitizer_unaligned_store16(void *p, uint16_t x);
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/// Stores a 32-bit unaligned value.
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///
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/// \param p Pointer to unaligned memory.
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/// \param x 32-bit value to store.
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void __sanitizer_unaligned_store32(void *p, uint32_t x);
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/// Stores a 64-bit unaligned value.
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///
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/// \param p Pointer to unaligned memory.
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/// \param x 64-bit value to store.
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void __sanitizer_unaligned_store64(void *p, uint64_t x);
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// Returns 1 on the first call, then returns 0 thereafter. Called by the tool
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// to ensure only one report is printed when multiple errors occur
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// simultaneously.
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int __sanitizer_acquire_crash_state();
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/// Annotates the current state of a contiguous container, such as
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/// <c>std::vector</c>, <c>std::string</c>, or similar.
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///
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/// A contiguous container is a container that keeps all of its elements
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/// in a contiguous region of memory. The container owns the region of memory
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/// <c>[beg, end)</c>; the memory <c>[beg, mid)</c> is used to store the
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/// current elements, and the memory <c>[mid, end)</c> is reserved for future
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/// elements (<c>beg <= mid <= end</c>). For example, in
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/// <c>std::vector<> v</c>:
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///
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/// \code
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/// beg = &v[0];
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/// end = beg + v.capacity() * sizeof(v[0]);
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/// mid = beg + v.size() * sizeof(v[0]);
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/// \endcode
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///
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/// This annotation tells the Sanitizer tool about the current state of the
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/// container so that the tool can report errors when memory from
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/// <c>[mid, end)</c> is accessed. Insert this annotation into methods like
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/// <c>push_back()</c> or <c>pop_back()</c>. Supply the old and new values of
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/// <c>mid</c>(<c><i>old_mid</i></c> and <c><i>new_mid</i></c>). In the initial
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/// state <c>mid == end</c>, so that should be the final state when the
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/// container is destroyed or when the container reallocates the storage.
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///
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/// For ASan, <c><i>beg</i></c> should be 8-aligned and <c><i>end</i></c>
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/// should be either 8-aligned or it should point to the end of a separate
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/// heap-, stack-, or global-allocated buffer. So the following example will
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/// not work:
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///
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/// \code
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/// int64_t x[2]; // 16 bytes, 8-aligned
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/// char *beg = (char *)&x[0];
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/// char *end = beg + 12; // Not 8-aligned, not the end of the buffer
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/// \endcode
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///
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/// The following, however, will work:
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/// \code
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/// int32_t x[3]; // 12 bytes, but 8-aligned under ASan.
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/// char *beg = (char*)&x[0];
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/// char *end = beg + 12; // Not 8-aligned, but is the end of the buffer
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/// \endcode
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///
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/// \note Use this function with caution and do not use for anything other
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/// than vector-like classes.
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///
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/// \param beg Beginning of memory region.
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/// \param end End of memory region.
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/// \param old_mid Old middle of memory region.
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/// \param new_mid New middle of memory region.
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void __sanitizer_annotate_contiguous_container(const void *beg,
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const void *end,
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const void *old_mid,
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const void *new_mid);
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/// Returns true if the contiguous container <c>[beg, end)</c> is properly
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/// poisoned.
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///
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/// Proper poisoning could occur, for example, with
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/// <c>__sanitizer_annotate_contiguous_container</c>), that is, if
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/// <c>[beg, mid)</c> is addressable and <c>[mid, end)</c> is unaddressable.
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/// Full verification requires O (<c>end - beg</c>) time; this function tries
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/// to avoid such complexity by touching only parts of the container around
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/// <c><i>beg</i></c>, <c><i>mid</i></c>, and <c><i>end</i></c>.
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///
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/// \param beg Beginning of memory region.
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/// \param mid Middle of memory region.
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/// \param end Old end of memory region.
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///
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/// \returns True if the contiguous container <c>[beg, end)</c> is properly
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/// poisoned.
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int __sanitizer_verify_contiguous_container(const void *beg, const void *mid,
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const void *end);
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/// Similar to <c>__sanitizer_verify_contiguous_container()</c> but also
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/// returns the address of the first improperly poisoned byte.
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///
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/// Returns NULL if the area is poisoned properly.
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///
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/// \param beg Beginning of memory region.
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/// \param mid Middle of memory region.
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/// \param end Old end of memory region.
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///
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/// \returns The bad address or NULL.
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const void *__sanitizer_contiguous_container_find_bad_address(const void *beg,
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const void *mid,
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const void *end);
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/// Prints the stack trace leading to this call (useful for calling from the
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/// debugger).
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void __sanitizer_print_stack_trace(void);
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// Symbolizes the supplied 'pc' using the format string 'fmt'.
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// Outputs at most 'out_buf_size' bytes into 'out_buf'.
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// If 'out_buf' is not empty then output is zero or more non empty C strings
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// followed by single empty C string. Multiple strings can be returned if PC
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// corresponds to inlined function. Inlined frames are printed in the order
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// from "most-inlined" to the "least-inlined", so the last frame should be the
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// not inlined function.
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// Inlined frames can be removed with 'symbolize_inline_frames=0'.
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// The format syntax is described in
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// lib/sanitizer_common/sanitizer_stacktrace_printer.h.
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void __sanitizer_symbolize_pc(void *pc, const char *fmt, char *out_buf,
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size_t out_buf_size);
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// Same as __sanitizer_symbolize_pc, but for data section (i.e. globals).
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void __sanitizer_symbolize_global(void *data_ptr, const char *fmt,
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char *out_buf, size_t out_buf_size);
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// Determine the return address.
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#if !defined(_MSC_VER) || defined(__clang__)
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#define __sanitizer_return_address() \
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__builtin_extract_return_addr(__builtin_return_address(0))
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#else
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extern "C" void *_ReturnAddress(void);
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#pragma intrinsic(_ReturnAddress)
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#define __sanitizer_return_address() _ReturnAddress()
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#endif
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/// Sets the callback to be called immediately before death on error.
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///
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/// Passing 0 will unset the callback.
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///
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/// \param callback User-provided callback.
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void __sanitizer_set_death_callback(void (*callback)(void));
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// Interceptor hooks.
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// Whenever a libc function interceptor is called, it checks if the
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// corresponding weak hook is defined, and calls it if it is indeed defined.
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// The primary use-case is data-flow-guided fuzzing, where the fuzzer needs
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// to know what is being passed to libc functions (for example memcmp).
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// FIXME: implement more hooks.
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/// Interceptor hook for <c>memcmp()</c>.
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///
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/// \param called_pc PC (program counter) address of the original call.
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/// \param s1 Pointer to block of memory.
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/// \param s2 Pointer to block of memory.
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/// \param n Number of bytes to compare.
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/// \param result Value returned by the intercepted function.
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void __sanitizer_weak_hook_memcmp(void *called_pc, const void *s1,
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const void *s2, size_t n, int result);
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/// Interceptor hook for <c>strncmp()</c>.
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///
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/// \param called_pc PC (program counter) address of the original call.
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/// \param s1 Pointer to block of memory.
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/// \param s2 Pointer to block of memory.
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/// \param n Number of bytes to compare.
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/// \param result Value returned by the intercepted function.
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void __sanitizer_weak_hook_strncmp(void *called_pc, const char *s1,
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const char *s2, size_t n, int result);
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/// Interceptor hook for <c>strncasecmp()</c>.
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///
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/// \param called_pc PC (program counter) address of the original call.
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/// \param s1 Pointer to block of memory.
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/// \param s2 Pointer to block of memory.
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/// \param n Number of bytes to compare.
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/// \param result Value returned by the intercepted function.
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void __sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1,
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const char *s2, size_t n, int result);
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/// Interceptor hook for <c>strcmp()</c>.
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///
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/// \param called_pc PC (program counter) address of the original call.
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/// \param s1 Pointer to block of memory.
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/// \param s2 Pointer to block of memory.
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/// \param result Value returned by the intercepted function.
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void __sanitizer_weak_hook_strcmp(void *called_pc, const char *s1,
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const char *s2, int result);
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/// Interceptor hook for <c>strcasecmp()</c>.
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///
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/// \param called_pc PC (program counter) address of the original call.
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/// \param s1 Pointer to block of memory.
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/// \param s2 Pointer to block of memory.
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/// \param result Value returned by the intercepted function.
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void __sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1,
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const char *s2, int result);
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/// Interceptor hook for <c>strstr()</c>.
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///
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/// \param called_pc PC (program counter) address of the original call.
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/// \param s1 Pointer to block of memory.
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/// \param s2 Pointer to block of memory.
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/// \param result Value returned by the intercepted function.
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void __sanitizer_weak_hook_strstr(void *called_pc, const char *s1,
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const char *s2, char *result);
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void __sanitizer_weak_hook_strcasestr(void *called_pc, const char *s1,
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const char *s2, char *result);
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void __sanitizer_weak_hook_memmem(void *called_pc,
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const void *s1, size_t len1,
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const void *s2, size_t len2, void *result);
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// Prints stack traces for all live heap allocations ordered by total
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// allocation size until top_percent of total live heap is shown. top_percent
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// should be between 1 and 100. At most max_number_of_contexts contexts
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// (stack traces) are printed.
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// Experimental feature currently available only with ASan on Linux/x86_64.
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void __sanitizer_print_memory_profile(size_t top_percent,
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size_t max_number_of_contexts);
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/// Notify ASan that a fiber switch has started (required only if implementing
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/// your own fiber library).
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///
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/// Before switching to a different stack, you must call
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/// <c>__sanitizer_start_switch_fiber()</c> with a pointer to the bottom of the
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/// destination stack and with its size. When code starts running on the new
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/// stack, it must call <c>__sanitizer_finish_switch_fiber()</c> to finalize
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/// the switch. The <c>__sanitizer_start_switch_fiber()</c> function takes a
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/// <c>void**</c> pointer argument to store the current fake stack if there is
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/// one (it is necessary when the runtime option
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/// <c>detect_stack_use_after_return</c> is enabled).
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///
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/// When restoring a stack, this <c>void**</c> pointer must be given to the
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/// <c>__sanitizer_finish_switch_fiber()</c> function. In most cases, this
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/// pointer can be stored on the stack immediately before switching. When
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/// leaving a fiber definitely, NULL must be passed as the first argument to
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/// the <c>__sanitizer_start_switch_fiber()</c> function so that the fake stack
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/// is destroyed. If your program does not need stack use-after-return
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/// detection, you can always pass NULL to these two functions.
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///
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/// \note The fake stack mechanism is disabled during fiber switch, so if a
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/// signal callback runs during the switch, it will not benefit from stack
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/// use-after-return detection.
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///
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/// \param[out] fake_stack_save Fake stack save location.
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/// \param bottom Bottom address of stack.
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/// \param size Size of stack in bytes.
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void __sanitizer_start_switch_fiber(void **fake_stack_save,
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const void *bottom, size_t size);
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/// Notify ASan that a fiber switch has completed (required only if
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/// implementing your own fiber library).
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///
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/// When code starts running on the new stack, it must call
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/// <c>__sanitizer_finish_switch_fiber()</c> to finalize
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/// the switch. For usage details, see the description of
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/// <c>__sanitizer_start_switch_fiber()</c>.
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///
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/// \param fake_stack_save Fake stack save location.
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/// \param[out] bottom_old Bottom address of old stack.
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/// \param[out] size_old Size of old stack in bytes.
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void __sanitizer_finish_switch_fiber(void *fake_stack_save,
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const void **bottom_old,
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size_t *size_old);
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// Get full module name and calculate pc offset within it.
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// Returns 1 if pc belongs to some module, 0 if module was not found.
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int __sanitizer_get_module_and_offset_for_pc(void *pc, char *module_path,
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size_t module_path_len,
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void **pc_offset);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // SANITIZER_COMMON_INTERFACE_DEFS_H
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