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112 lines
4.5 KiB
C
112 lines
4.5 KiB
C
/*===- InstrProfilingPlatformWindows.c - Profile data on Windows ----------===*\
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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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#include <stddef.h>
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#include "InstrProfiling.h"
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#include "InstrProfilingInternal.h"
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#if defined(_WIN32)
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#if defined(_MSC_VER)
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/* Merge read-write sections into .data. */
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#pragma comment(linker, "/MERGE:.lprfb=.data")
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#pragma comment(linker, "/MERGE:.lprfd=.data")
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#pragma comment(linker, "/MERGE:.lprfv=.data")
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#pragma comment(linker, "/MERGE:.lprfnd=.data")
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/* Do *NOT* merge .lprfn and .lcovmap into .rdata. llvm-cov must be able to find
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* after the fact.
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* Do *NOT* merge .lprfc .rdata. When binary profile correlation is enabled,
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* llvm-cov must be able to find after the fact.
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*/
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/* Allocate read-only section bounds. */
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#pragma section(".lprfn$A", read)
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#pragma section(".lprfn$Z", read)
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/* Allocate read-write section bounds. */
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#pragma section(".lprfd$A", read, write)
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#pragma section(".lprfd$Z", read, write)
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#pragma section(".lprfc$A", read, write)
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#pragma section(".lprfc$Z", read, write)
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#pragma section(".lprfb$A", read, write)
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#pragma section(".lprfb$Z", read, write)
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#pragma section(".lorderfile$A", read, write)
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#pragma section(".lprfnd$A", read, write)
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#pragma section(".lprfnd$Z", read, write)
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#endif
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__llvm_profile_data COMPILER_RT_SECTION(".lprfd$A") DataStart = {0};
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__llvm_profile_data COMPILER_RT_SECTION(".lprfd$Z") DataEnd = {0};
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const char COMPILER_RT_SECTION(".lprfn$A") NamesStart = '\0';
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const char COMPILER_RT_SECTION(".lprfn$Z") NamesEnd = '\0';
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char COMPILER_RT_SECTION(".lprfc$A") CountersStart;
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char COMPILER_RT_SECTION(".lprfc$Z") CountersEnd;
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char COMPILER_RT_SECTION(".lprfb$A") BitmapStart;
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char COMPILER_RT_SECTION(".lprfb$Z") BitmapEnd;
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uint32_t COMPILER_RT_SECTION(".lorderfile$A") OrderFileStart;
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ValueProfNode COMPILER_RT_SECTION(".lprfnd$A") VNodesStart;
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ValueProfNode COMPILER_RT_SECTION(".lprfnd$Z") VNodesEnd;
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const __llvm_profile_data *__llvm_profile_begin_data(void) {
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return &DataStart + 1;
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}
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const __llvm_profile_data *__llvm_profile_end_data(void) { return &DataEnd; }
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// Type profiling isn't implemented under MSVC ABI, so return NULL (rather than
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// implementing linker magic on Windows) to make it more explicit. To elaborate,
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// the current type profiling implementation maps a profiled vtable address to a
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// vtable variable through vtables mangled name. Under MSVC ABI, the variable
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// name for vtables might not be the mangled name (see
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// MicrosoftCXXABI::getAddrOfVTable in MicrosoftCXXABI.cpp for more details on
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// how a vtable name is computed). Note the mangled name is still in the vtable
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// IR (just not variable name) for mapping purpose, but more implementation work
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// is required.
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const VTableProfData *__llvm_profile_begin_vtables(void) { return NULL; }
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const VTableProfData *__llvm_profile_end_vtables(void) { return NULL; }
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const char *__llvm_profile_begin_names(void) { return &NamesStart + 1; }
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const char *__llvm_profile_end_names(void) { return &NamesEnd; }
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// Type profiling isn't supported on Windows, so return NULl to make it more
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// explicit.
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const char *__llvm_profile_begin_vtabnames(void) { return NULL; }
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const char *__llvm_profile_end_vtabnames(void) { return NULL; }
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char *__llvm_profile_begin_counters(void) { return &CountersStart + 1; }
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char *__llvm_profile_end_counters(void) { return &CountersEnd; }
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char *__llvm_profile_begin_bitmap(void) { return &BitmapStart + 1; }
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char *__llvm_profile_end_bitmap(void) { return &BitmapEnd; }
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uint32_t *__llvm_profile_begin_orderfile(void) { return &OrderFileStart; }
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ValueProfNode *__llvm_profile_begin_vnodes(void) { return &VNodesStart + 1; }
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ValueProfNode *__llvm_profile_end_vnodes(void) { return &VNodesEnd; }
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ValueProfNode *CurrentVNode = &VNodesStart + 1;
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ValueProfNode *EndVNode = &VNodesEnd;
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/* lld-link provides __buildid symbol which points to the 16 bytes build id when
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* using /build-id flag. https://lld.llvm.org/windows_support.html#lld-flags */
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#define BUILD_ID_LEN 16
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COMPILER_RT_WEAK uint8_t __buildid[BUILD_ID_LEN] = {0};
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COMPILER_RT_VISIBILITY int __llvm_write_binary_ids(ProfDataWriter *Writer) {
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static const uint8_t zeros[BUILD_ID_LEN] = {0};
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if (memcmp(__buildid, zeros, BUILD_ID_LEN) != 0) {
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if (Writer &&
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lprofWriteOneBinaryId(Writer, BUILD_ID_LEN, __buildid, 0) == -1)
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return -1;
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return sizeof(uint64_t) + BUILD_ID_LEN;
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}
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return 0;
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}
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#endif
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