mirror of
https://github.com/apple/swift.git
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273 lines
8.3 KiB
Objective-C
273 lines
8.3 KiB
Objective-C
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include <Foundation/Foundation.h>
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#include "format.h"
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static inline void
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_os_log_encode_arg(os_trace_blob_t ob, os_log_fmt_cmd_t cmd, const void *data)
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{
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os_trace_blob_add(ob, cmd, sizeof(os_log_fmt_cmd_s));
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os_trace_blob_add(ob, data, cmd->cmd_size);
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}
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bool
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_os_log_encode(char buf[OS_LOG_FMT_BUF_SIZE], const char *format, va_list args,
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int saved_errno, os_trace_blob_t ob)
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{
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os_log_fmt_hdr_s hdr = { };
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os_trace_blob_add(ob, &hdr, sizeof(hdr));
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const char *percent = strchr(format, '%');
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while (percent != NULL) {
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++percent;
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if (percent[0] != '%') {
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os_log_fmt_cmd_s cmd = { };
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os_log_count_type_t widtht = T_C_NONE;
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os_log_count_type_t prect = T_C_NONE;
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os_log_fmt_cmd_flags_t flags = 0;
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int type = T_INT;
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bool long_double = false;
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int precision = 0;
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char ch;
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if (hdr.hdr_cmd_cnt == OS_LOG_FMT_MAX_CMDS) {
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break;
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}
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for (bool done = false; !done; percent++) {
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switch (ch = percent[0]) {
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/* type of types or other */
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case 'l': type++; break; // longer
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case 'h': type--; break; // shorter
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case 'z': type = T_SIZE; break;
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case 'j': type = T_INTMAX; break;
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case 't': type = T_PTRDIFF; break;
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case '*': // dynamic width
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widtht = T_C_DYNAMIC;
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// if the next character is a '.' then increment percent
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// and fallthrough to the precision handling code
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if (percent[1] != '.') {
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break;
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}
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percent++;
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// FALLTHROUGH
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case '.': // precision
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if ((percent[1]) == '*') {
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prect = T_C_DYNAMIC;
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percent++;
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} else {
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while (isdigit(percent[1])) {
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precision = 10 * precision + (percent[1] - '0');
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percent++;
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}
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if (precision > 1024) precision = 1024;
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prect = T_C_STATIC;
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}
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break;
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case '-': // left-align
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case '+': // force sign
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case ' ': // prefix non-negative with space
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case '#': // alternate
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case '\'': // group by thousands
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break;
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case '{': // annotated symbols
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for (const char *curr2 = percent + 1; (ch = (*curr2)) != 0; curr2++) {
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if (ch == '}') {
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if (strncmp(percent + 1, "private", MIN(curr2 - percent - 1, 7)) == 0) {
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hdr.hdr_flags |= OSLF_HDR_FLAG_HAS_PRIVATE;
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flags |= OSLF_CMD_FLAG_PRIVATE;
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} else if (strncmp(percent + 1, "public", MIN(curr2 - percent - 1, 6)) == 0) {
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flags |= OSLF_CMD_FLAG_PUBLIC;
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}
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percent = curr2;
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break;
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}
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}
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break;
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#define encode_width() ({ \
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if (widtht == T_C_DYNAMIC) { \
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cmd.cmd_type = OSLF_CMD_TYPE_SCALAR; \
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encode(int, 0); \
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}})
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// clang inconsistency: static precision counts are still marked with the
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// privacy bits of the command they preceed
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#define encode_precision(type) ({ \
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if (prect != T_C_NONE) { \
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cmd.cmd_type = type; \
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cmd.cmd_size = sizeof(int); \
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if (prect == T_C_STATIC && type == OSLF_CMD_TYPE_COUNT) { \
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cmd.cmd_flags = flags; \
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} else if (prect == T_C_DYNAMIC) { \
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precision = va_arg(args, int); \
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} \
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_os_log_encode_arg(ob, &cmd, &precision); \
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hdr.hdr_cmd_cnt++; \
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prect = T_C_NONE; \
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}})
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// scalar data types encode their precision as a scalar
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#define encode_scalar_preamble() ({ \
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encode_width(); \
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if (prect == T_C_DYNAMIC) { \
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encode_precision(OSLF_CMD_TYPE_SCALAR); \
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}})
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#define encode_pointer_preamble() ({ \
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encode_width(); \
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encode_precision(OSLF_CMD_TYPE_COUNT); \
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})
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#define encode_nsstring(flags) ({ \
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NSString *__arg = va_arg(args, NSString *); \
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const char * _Nullable __var = __arg.UTF8String; \
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cmd.cmd_flags = flags; \
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cmd.cmd_size = sizeof(__var); \
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_os_log_encode_arg(ob, &cmd, &__var); \
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hdr.hdr_cmd_cnt++; \
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})
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#define encode_smallint(ty, flags) ({ \
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int __var = va_arg(args, int); \
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cmd.cmd_flags = flags; \
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cmd.cmd_size = sizeof(__var); \
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_os_log_encode_arg(ob, &cmd, &__var); \
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hdr.hdr_cmd_cnt++; \
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})
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#define encode(ty, flags) ({ \
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ty __var = va_arg(args, ty); \
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cmd.cmd_flags = flags; \
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cmd.cmd_size = sizeof(__var); \
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_os_log_encode_arg(ob, &cmd, &__var); \
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hdr.hdr_cmd_cnt++; \
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})
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/* fixed types */
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case 'c': // char
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case 'd': // integer
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case 'i': // integer
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case 'o': // octal
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case 'u': // unsigned
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case 'x': // hex
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case 'X': // upper-hex
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encode_scalar_preamble();
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cmd.cmd_type = OSLF_CMD_TYPE_SCALAR;
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switch (type) {
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case T_CHAR: encode_smallint(char, flags); break;
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case T_SHORT: encode_smallint(short, flags); break;
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case T_INT: encode(int, flags); break;
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case T_LONG: encode(long, flags); break;
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case T_LONGLONG: encode(long long, flags); break;
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case T_SIZE: encode(size_t, flags); break;
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case T_INTMAX: encode(intmax_t, flags); break;
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case T_PTRDIFF: encode(ptrdiff_t, flags); break;
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default: return false;
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}
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done = true;
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break;
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case 'p': // emit pointers as scalars
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cmd.cmd_type = OSLF_CMD_TYPE_SCALAR;
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encode(void *, flags);
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done = true;
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break;
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case 'C': // wchar is treated like %lc
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encode_scalar_preamble();
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cmd.cmd_type = OSLF_CMD_TYPE_SCALAR;
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encode_smallint(wint_t, flags);
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done = true;
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break;
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case 'P': // pointer data
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encode_pointer_preamble();
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hdr.hdr_flags |= OSLF_HDR_FLAG_HAS_NON_SCALAR;
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cmd.cmd_type = OSLF_CMD_TYPE_DATA;
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cmd.cmd_size = sizeof(void *);
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encode(void *, flags);
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done = true;
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break;
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case 'L': // long double
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long_double = true;
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break;
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case 'a': case 'A': case 'e': case 'E': // floating types
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case 'f': case 'F': case 'g': case 'G':
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encode_scalar_preamble();
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cmd.cmd_type = OSLF_CMD_TYPE_SCALAR;
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if (long_double) {
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encode(long double, flags);
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} else {
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encode(double, flags);
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}
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done = true;
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break;
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case 's': // Strings sent from Swift as NSString objects
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encode_pointer_preamble();
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hdr.hdr_flags |= OSLF_HDR_FLAG_HAS_NON_SCALAR;
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cmd.cmd_type = OSLF_CMD_TYPE_STRING;
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encode_nsstring(flags);
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done = true;
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break;
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case '@': // CFTypeRef aka NSObject *
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// %@ does not support precision
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encode_width();
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hdr.hdr_flags |= OSLF_HDR_FLAG_HAS_NON_SCALAR;
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cmd.cmd_type = OSLF_CMD_TYPE_OBJECT;
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encode(void *, flags);
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done = true;
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break;
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case 'm':
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cmd.cmd_type = OSLF_CMD_TYPE_SCALAR;
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cmd.cmd_size = sizeof(int);
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cmd.cmd_flags = flags;
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_os_log_encode_arg(ob, &cmd, &saved_errno);
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hdr.hdr_cmd_cnt++;
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done = true;
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break;
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default:
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if (isdigit(ch)) { // [0-9]
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continue;
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}
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done = true;
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break;
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}
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if (done) {
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percent = strchr(percent, '%'); // Find next format
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break;
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}
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}
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} else {
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percent = strchr(percent+1, '%'); // Find next format after %%
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}
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}
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*(os_log_fmt_hdr_t)buf = hdr;
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return true;
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}
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#undef encode_nsstring
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#undef encode_smallint
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#undef encode
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