86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*===- PGOProfiling.c - Support library for PGO instrumentation -----------===*\
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|*
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|* The LLVM Compiler Infrastructure
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|*
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|* This file is distributed under the University of Illinois Open Source
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|* License. See LICENSE.TXT for details.
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|*
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\*===----------------------------------------------------------------------===*/
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef _MSC_VER
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#include <stdint.h>
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#else
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typedef unsigned int uint32_t;
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typedef unsigned int uint64_t;
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#endif
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static FILE *OutputFile = NULL;
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/*
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* A list of functions to write out the data.
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*/
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typedef void (*writeout_fn)();
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struct writeout_fn_node {
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writeout_fn fn;
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struct writeout_fn_node *next;
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};
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static struct writeout_fn_node *writeout_fn_head = NULL;
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static struct writeout_fn_node *writeout_fn_tail = NULL;
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void llvm_pgo_emit(const char *MangledName, uint32_t NumCounters,
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uint64_t *Counters) {
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uint32_t i;
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fprintf(OutputFile, "%s %u\n", MangledName, NumCounters);
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for (i = 0; i < NumCounters; ++i)
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fprintf(OutputFile, "%" PRIu64 "\n", Counters[i]);
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fprintf(OutputFile, "\n");
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}
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void llvm_pgo_register_writeout_function(writeout_fn fn) {
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struct writeout_fn_node *new_node = malloc(sizeof(struct writeout_fn_node));
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new_node->fn = fn;
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new_node->next = NULL;
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if (!writeout_fn_head) {
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writeout_fn_head = writeout_fn_tail = new_node;
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} else {
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writeout_fn_tail->next = new_node;
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writeout_fn_tail = new_node;
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}
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}
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void llvm_pgo_writeout_files() {
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const char *OutputName = getenv("LLVM_PROFILE_FILE");
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if (OutputName == NULL || OutputName[0] == '\0')
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OutputName = "default.profdata";
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OutputFile = fopen(OutputName, "w");
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if (!OutputFile) return;
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while (writeout_fn_head) {
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struct writeout_fn_node *node = writeout_fn_head;
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writeout_fn_head = writeout_fn_head->next;
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node->fn();
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free(node);
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}
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fclose(OutputFile);
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}
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void llvm_pgo_init(writeout_fn wfn) {
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static int atexit_ran = 0;
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if (wfn)
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llvm_pgo_register_writeout_function(wfn);
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if (atexit_ran == 0) {
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atexit_ran = 1;
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atexit(llvm_pgo_writeout_files);
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}
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}
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