1 /*===- InstrProfilingPlatformWindows.c - Profile data on Windows ----------===*\ 2 |* 3 |* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 |* See https://llvm.org/LICENSE.txt for license information. 5 |* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 |* 7 \*===----------------------------------------------------------------------===*/ 8 9 #include <stddef.h> 10 11 #include "InstrProfiling.h" 12 #include "InstrProfilingInternal.h" 13 14 #if defined(_WIN32) 15 16 #if defined(_MSC_VER) 17 /* Merge read-write sections into .data. */ 18 #pragma comment(linker, "/MERGE:.lprfb=.data") 19 #pragma comment(linker, "/MERGE:.lprfd=.data") 20 #pragma comment(linker, "/MERGE:.lprfv=.data") 21 #pragma comment(linker, "/MERGE:.lprfnd=.data") 22 /* Do *NOT* merge .lprfn and .lcovmap into .rdata. llvm-cov must be able to find 23 * after the fact. 24 * Do *NOT* merge .lprfc .rdata. When binary profile correlation is enabled, 25 * llvm-cov must be able to find after the fact. 26 */ 27 28 /* Allocate read-only section bounds. */ 29 #pragma section(".lprfn$A", read) 30 #pragma section(".lprfn$Z", read) 31 32 /* Allocate read-write section bounds. */ 33 #pragma section(".lprfd$A", read, write) 34 #pragma section(".lprfd$Z", read, write) 35 #pragma section(".lprfc$A", read, write) 36 #pragma section(".lprfc$Z", read, write) 37 #pragma section(".lprfb$A", read, write) 38 #pragma section(".lprfb$Z", read, write) 39 #pragma section(".lprfnd$A", read, write) 40 #pragma section(".lprfnd$Z", read, write) 41 #endif 42 43 __llvm_profile_data COMPILER_RT_SECTION(".lprfd$A") DataStart = {0}; 44 __llvm_profile_data COMPILER_RT_SECTION(".lprfd$Z") DataEnd = {0}; 45 46 const char COMPILER_RT_SECTION(".lprfn$A") NamesStart = '\0'; 47 const char COMPILER_RT_SECTION(".lprfn$Z") NamesEnd = '\0'; 48 49 char COMPILER_RT_SECTION(".lprfc$A") CountersStart; 50 char COMPILER_RT_SECTION(".lprfc$Z") CountersEnd; 51 char COMPILER_RT_SECTION(".lprfb$A") BitmapStart; 52 char COMPILER_RT_SECTION(".lprfb$Z") BitmapEnd; 53 54 ValueProfNode COMPILER_RT_SECTION(".lprfnd$A") VNodesStart; 55 ValueProfNode COMPILER_RT_SECTION(".lprfnd$Z") VNodesEnd; 56 57 const __llvm_profile_data *__llvm_profile_begin_data(void) { 58 return &DataStart + 1; 59 } 60 const __llvm_profile_data *__llvm_profile_end_data(void) { return &DataEnd; } 61 62 // Type profiling isn't implemented under MSVC ABI, so return NULL (rather than 63 // implementing linker magic on Windows) to make it more explicit. To elaborate, 64 // the current type profiling implementation maps a profiled vtable address to a 65 // vtable variable through vtables mangled name. Under MSVC ABI, the variable 66 // name for vtables might not be the mangled name (see 67 // MicrosoftCXXABI::getAddrOfVTable in MicrosoftCXXABI.cpp for more details on 68 // how a vtable name is computed). Note the mangled name is still in the vtable 69 // IR (just not variable name) for mapping purpose, but more implementation work 70 // is required. 71 const VTableProfData *__llvm_profile_begin_vtables(void) { return NULL; } 72 const VTableProfData *__llvm_profile_end_vtables(void) { return NULL; } 73 74 const char *__llvm_profile_begin_names(void) { return &NamesStart + 1; } 75 const char *__llvm_profile_end_names(void) { return &NamesEnd; } 76 77 // Type profiling isn't supported on Windows, so return NULl to make it more 78 // explicit. 79 const char *__llvm_profile_begin_vtabnames(void) { return NULL; } 80 const char *__llvm_profile_end_vtabnames(void) { return NULL; } 81 82 char *__llvm_profile_begin_counters(void) { return &CountersStart + 1; } 83 char *__llvm_profile_end_counters(void) { return &CountersEnd; } 84 char *__llvm_profile_begin_bitmap(void) { return &BitmapStart + 1; } 85 char *__llvm_profile_end_bitmap(void) { return &BitmapEnd; } 86 87 ValueProfNode *__llvm_profile_begin_vnodes(void) { return &VNodesStart + 1; } 88 ValueProfNode *__llvm_profile_end_vnodes(void) { return &VNodesEnd; } 89 90 ValueProfNode *CurrentVNode = &VNodesStart + 1; 91 ValueProfNode *EndVNode = &VNodesEnd; 92 93 /* lld-link provides __buildid symbol which points to the 16 bytes build id when 94 * using /build-id flag. https://lld.llvm.org/windows_support.html#lld-flags */ 95 #define BUILD_ID_LEN 16 96 COMPILER_RT_WEAK uint8_t __buildid[BUILD_ID_LEN] = {0}; 97 COMPILER_RT_VISIBILITY int __llvm_write_binary_ids(ProfDataWriter *Writer) { 98 static const uint8_t zeros[BUILD_ID_LEN] = {0}; 99 if (memcmp(__buildid, zeros, BUILD_ID_LEN) != 0) { 100 if (Writer && 101 lprofWriteOneBinaryId(Writer, BUILD_ID_LEN, __buildid, 0) == -1) 102 return -1; 103 return sizeof(uint64_t) + BUILD_ID_LEN; 104 } 105 return 0; 106 } 107 108 #endif 109