instrument_cov.c File Reference

SanitizerCoverage runtime hooks for code coverage tracking. More...

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Functions
void	__sanitizer_cov_trace_pc_guard (uint32_t *guard)
void	__sanitizer_cov_trace_pc_guard_init (uint32_t *start, uint32_t *stop)

Detailed Description

SanitizerCoverage runtime hooks for code coverage tracking.

Implements the runtime interface for Clang's SanitizerCoverage instrumentation. Provides two hooks that are automatically called by the compiler:

• __sanitizer_cov_trace_pc_guard() - Logs execution of each covered instruction
• __sanitizer_cov_trace_pc_guard_init() - Initializes coverage tracking state

Coverage data is logged via the instrumentation logging system for analysis in post-processing and coverage report generation.

See also

include/ascii-chat/tooling/panic/instrument_log.h

Definition in file instrument_cov.c.

Function Documentation

__sanitizer_cov_trace_pc_guard()

void __sanitizer_cov_trace_pc_guard

(

uint32_t *

guard

)

Definition at line 25 of file instrument_cov.c.

                                                     {
  if (guard == NULL || *guard == 0U) {
    return;
  }
 
  asciichat_instr_log_pc((uintptr_t)__builtin_return_address(0));
}

References asciichat_instr_log_pc().

__sanitizer_cov_trace_pc_guard_init()

void __sanitizer_cov_trace_pc_guard_init	(	uint32_t *	start,
		uint32_t *	stop
	)

Definition at line 33 of file instrument_cov.c.

                                                                          {
  if (start == NULL || stop == NULL || start == stop) {
    return;
  }
 
  if (*start != 0U) {
    return;
  }
 
  uint32_t counter = 1U;
  for (uint32_t *it = start; it < stop; ++it) {
    if (*it == 0U) {
      *it = counter++;
    }
  }
}