Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: 1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00 ipe: Place strings and metadata into specific .ipe section By placing the .ipe metadata into a specific section it can be stripped from the final binary if desired. ``` objcopy --remove-section .ipe <binary> upx <binary> ``` Towards #21766 - - - - - c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Place magic word at the start of entries in the .ipe section The magic word "IPE\nIPE\n" is placed at the start of .ipe sections, then if the section is stripped, we can check whether the section starts with the magic word or not to determine whether there is metadata present or not. Towards #21766 - - - - - cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Use stable IDs for IPE entries IPEs have historically been indexed and reported by their address. This makes it impossible to compare profiles between runs, since the addresses may change (due to ASLR) and also makes it tricky to separate out the IPE map from the binary. This small patch adds a stable identifier for each IPE entry. The stable identifier is a single 64 bit word. The high-bits are a per-module identifier and the low bits identify which entry in each module. 1. When a node is added into the IPE buffer it is assigned a unique identifier from an incrementing global counter. 2. Each entry already has an index by it's position in the `IpeBufferListNode`. The two are combined together by the `IPE_ENTRY_KEY` macro. Info table profiling uses the stable identifier rather than the address of the info table. The benefits of this change are: * Profiles from different runs can be easily compared * The metadata can be extracted from the binary (via the eventlog for example) and then stripped from the executable. Fixes #21766 - - - - - 12 changed files: - compiler/GHC/Cmm.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/Ppr.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/StgToCmm/InfoTableProv.hs - docs/users_guide/debug-info.rst - rts/IPE.c - rts/ProfHeap.c - rts/eventlog/EventLog.c - rts/include/rts/IPE.h - testsuite/tests/rts/ipe/ipeMap.c - testsuite/tests/rts/ipe/ipe_lib.c Changes: ===================================== compiler/GHC/Cmm.hs ===================================== @@ -278,6 +278,7 @@ data SectionType | InitArray -- .init_array on ELF, .ctor on Windows | FiniArray -- .fini_array on ELF, .dtor on Windows | CString + | IPE | OtherSection String deriving (Show) @@ -298,6 +299,7 @@ sectionProtection (Section t _) = case t of CString -> ReadOnlySection Data -> ReadWriteSection UninitialisedData -> ReadWriteSection + IPE -> ReadWriteSection (OtherSection _) -> ReadWriteSection {- @@ -557,4 +559,5 @@ pprSectionType s = doubleQuotes $ case s of InitArray -> text "initarray" FiniArray -> text "finiarray" CString -> text "cstring" + IPE -> text "ipe" OtherSection s' -> text s' ===================================== compiler/GHC/CmmToAsm/PPC/Ppr.hs ===================================== @@ -285,6 +285,9 @@ pprAlignForSection platform seg = line $ Data | ppc64 -> text ".align 3" | otherwise -> text ".align 2" + IPE + | ppc64 -> text ".align 3" + | otherwise -> text ".align 2" ReadOnlyData | ppc64 -> text ".align 3" | otherwise -> text ".align 2" ===================================== compiler/GHC/CmmToAsm/Ppr.hs ===================================== @@ -236,6 +236,10 @@ pprGNUSectionHeader config t suffix = | OSMinGW32 <- platformOS platform -> text ".rdata" | otherwise -> text ".rodata.str" + IPE + | OSMinGW32 <- platformOS platform + -> text ".rdata" + | otherwise -> text ".ipe" OtherSection _ -> panic "PprBase.pprGNUSectionHeader: unknown section type" flags = case t of @@ -248,6 +252,10 @@ pprGNUSectionHeader config t suffix = | OSMinGW32 <- platformOS platform -> empty | otherwise -> text ",\"aMS\"," <> sectionType platform "progbits" <> text ",1" + IPE + | OSMinGW32 <- platformOS platform + -> empty + | otherwise -> text ",\"a\"," <> sectionType platform "progbits" _ -> empty {-# SPECIALIZE pprGNUSectionHeader :: NCGConfig -> SectionType -> CLabel -> SDoc #-} {-# SPECIALIZE pprGNUSectionHeader :: NCGConfig -> SectionType -> CLabel -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable @@ -262,6 +270,7 @@ pprXcoffSectionHeader t = case t of RelocatableReadOnlyData -> text ".csect .text[PR] # RelocatableReadOnlyData" CString -> text ".csect .text[PR] # CString" UninitialisedData -> text ".csect .data[BS]" + IPE -> text ".csect .text[PR] #IPE" _ -> panic "pprXcoffSectionHeader: unknown section type" {-# SPECIALIZE pprXcoffSectionHeader :: SectionType -> SDoc #-} {-# SPECIALIZE pprXcoffSectionHeader :: SectionType -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable @@ -276,6 +285,7 @@ pprDarwinSectionHeader t = case t of InitArray -> text ".section\t__DATA,__mod_init_func,mod_init_funcs" FiniArray -> panic "pprDarwinSectionHeader: fini not supported" CString -> text ".section\t__TEXT,__cstring,cstring_literals" + IPE -> text ".const" OtherSection _ -> panic "pprDarwinSectionHeader: unknown section type" {-# SPECIALIZE pprDarwinSectionHeader :: SectionType -> SDoc #-} {-# SPECIALIZE pprDarwinSectionHeader :: SectionType -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable ===================================== compiler/GHC/CmmToLlvm/Data.hs ===================================== @@ -145,7 +145,7 @@ llvmSectionType p t = case t of CString -> case platformOS p of OSMinGW32 -> fsLit ".rdata$str" _ -> fsLit ".rodata.str" - + IPE -> fsLit ".ipe" InitArray -> panic "llvmSectionType: InitArray" FiniArray -> panic "llvmSectionType: FiniArray" OtherSection _ -> panic "llvmSectionType: unknown section type" ===================================== compiler/GHC/StgToCmm/InfoTableProv.hs ===================================== @@ -10,6 +10,7 @@ import qualified Data.ByteString.Internal as BSI import GHC.IO (unsafePerformIO) #endif +import Data.Char import GHC.Prelude import GHC.Platform import GHC.Types.SrcLoc (pprUserRealSpan, srcSpanFile) @@ -66,6 +67,28 @@ construction, the 'compressed' field of each IPE buffer list node is examined. If the field indicates that the data has been compressed, the entry data and strings table are decompressed before continuing with the normal IPE map construction. + +Note [IPE Stripping and magic words] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +For systems which support ELF executables: + +The metadata part of IPE info is placed into a separate ELF section (.ipe). +This can then be stripped afterwards if you don't require the metadata + +``` +-- Remove the section +objcopy --remove-section .ipe <your-exe> +-- Repack and compress the executable +upx <your-exe> +``` + +The .ipe section starts with a magic 64-bit word "IPE\0IPE\0`, encoded as ascii. + +The RTS checks to see if the .ipe section starts with the magic word. If the +section has been stripped then it won't start with the magic word and the +metadata won't be accessible for the info tables. + -} emitIpeBufferListNode :: @@ -110,7 +133,7 @@ emitIpeBufferListNode this_mod ents dus0 = do strings_bytes = compress defaultCompressionLevel uncompressed_strings strings :: [CmmStatic] - strings = [CmmString strings_bytes] + strings = [CmmString (ipe_header `mappend` strings_bytes)] uncompressed_entries :: BS.ByteString uncompressed_entries = toIpeBufferEntries (platformByteOrder platform) cg_ipes @@ -119,16 +142,42 @@ emitIpeBufferListNode this_mod ents dus0 = do entries_bytes = compress defaultCompressionLevel uncompressed_entries entries :: [CmmStatic] - entries = [CmmString entries_bytes] + entries = [CmmString (ipe_header `mappend` entries_bytes)] ipe_buffer_lbl :: CLabel ipe_buffer_lbl = mkIPELabel this_mod + -- A string which fits into one 64-bit word. + ipe_header_word :: Word64 + ipe_header_word = stringToWord64BE "IPE\0IPE\0" + + -- Convert 8 bytes to Word64 using big-endian interpretation + stringToWord64BE :: String -> Word64 + stringToWord64BE = foldl' (\acc b -> GHC.Prelude.shiftL acc 8 .|. fromIntegral (ord b)) 0 + + -- A magic word we can use to see if the IPE information has been stripped + -- or not + -- See Note [IPE Stripping and magic words] + -- When read then literally the string should read IPE\0IPE\0 in hex dumps. + -- + -- There is some complexity here to turn this into a ByteString rather than + -- a simpler CmmStaticLit, since the unregistered backend does not cope well + -- with CmmStaticsRaw being a mixure of CmmStaticLit and CmmString. + ipe_header :: BS.ByteString + ipe_header = BSL.toStrict . BSB.toLazyByteString $ + case platformByteOrder platform of + LittleEndian -> BSB.word64LE ipe_header_word + BigEndian -> BSB.word64BE ipe_header_word + + ipe_buffer_node :: [CmmStatic] ipe_buffer_node = map CmmStaticLit [ -- 'next' field zeroCLit platform + -- 'node_id' field + , zeroCLit platform + -- 'compressed' field , int do_compress @@ -164,12 +213,12 @@ emitIpeBufferListNode this_mod ents dus0 = do -- Emit the strings table emitDecl $ CmmData - (Section Data strings_lbl) + (Section IPE strings_lbl) (CmmStaticsRaw strings_lbl strings) -- Emit the list of IPE buffer entries emitDecl $ CmmData - (Section Data entries_lbl) + (Section IPE entries_lbl) (CmmStaticsRaw entries_lbl entries) -- Emit the IPE buffer list node ===================================== docs/users_guide/debug-info.rst ===================================== @@ -391,6 +391,17 @@ to a source location. This lookup table is generated by using the ``-finfo-table In a test compiling GHC itself, the size of the :ghc-flag:`-finfo-table-map` enabled build results was reduced by over 20% when compression was enabled. + The metadata for ``-finfo-table-map`` is stored in the ``.ipe`` section on + ELF platforms. The ``.ipe`` section can be removed from the binary after compilation:: + + objcopy --remove-section .ipe <binary> + upx <binary> + + You can first compile your application with ``-finfo-table-map``, extract + the contents of the map (by using the eventlog), strip the ``.ipe`` section + and then use the extracted data to interpret a ``-hi`` profile from the stripped + binary. + :since: 9.10 :implies: :ghc-flag:`-finfo-table-map-with-stack` :implies: :ghc-flag:`-finfo-table-map-with-fallback` ===================================== rts/IPE.c ===================================== @@ -62,6 +62,22 @@ entry's containing IpeBufferListNode and its index in that node. When the user looks up an IPE entry, we convert it to the user-facing InfoProvEnt representation. +Note [Stable identifiers for IPE entries] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Each IPE entry is given a stable identifier which remains the same across +different runs of the executable (unlike the address of the info table). + +The identifier is a 64-bit word which consists of two parts. + +* The high 32-bits are a per-node identifier. +* The low 32-bits are the index of the entry in the node. + +When a node is queued in the pending list by `registerInfoProvList` it is +given a unique identifier from an incrementing global variable. + +The unique key can be computed by using the `IPE_ENTRY_KEY` macro. + */ typedef struct { @@ -69,6 +85,13 @@ typedef struct { uint32_t idx; } IpeMapEntry; +// See Note [Stable identifiers for IPE entries] +#define IPE_ENTRY_KEY(entry) \ + MAKE_IPE_KEY((entry).node->node_id, (entry).idx) + +#define MAKE_IPE_KEY(module_id, idx) \ + ((((uint64_t)(module_id)) << 32) | ((uint64_t)(idx))) + #if defined(THREADED_RTS) static Mutex ipeMapLock; #endif @@ -78,9 +101,22 @@ static HashTable *ipeMap = NULL; // Accessed atomically static IpeBufferListNode *ipeBufferList = NULL; +// A global counter which is used to give an IPE entry a unique value across runs. +static StgWord next_module_id = 1; // Start at 1 to reserve 0 as "invalid" + static void decompressIPEBufferListNodeIfCompressed(IpeBufferListNode*); static void updateIpeMap(void); +// Check whether the IpeBufferListNode has the relevant magic words. +// See Note [IPE Stripping and magic words] +static inline bool ipe_node_valid(const IpeBufferListNode *node) { + return node && + node->entries_block && + node->string_table_block && + node->entries_block->magic == IPE_MAGIC_WORD && + node->string_table_block->magic == IPE_MAGIC_WORD; +} + #if defined(THREADED_RTS) void initIpe(void) { initMutex(&ipeMapLock); } @@ -99,11 +135,12 @@ static InfoProvEnt ipeBufferEntryToIpe(const IpeBufferListNode *node, uint32_t i { CHECK(idx < node->count); CHECK(!node->compressed); - const char *strings = node->string_table; - const IpeBufferEntry *ent = &node->entries[idx]; + const char *strings = node->string_table_block->string_table; + const IpeBufferEntry *ent = &node->entries_block->entries[idx]; return (InfoProvEnt) { .info = node->tables[idx], .prov = { + .info_prov_id = MAKE_IPE_KEY(node->node_id, idx), .table_name = &strings[ent->table_name], .closure_desc = ent->closure_desc, .ty_desc = &strings[ent->ty_desc], @@ -121,19 +158,23 @@ static InfoProvEnt ipeBufferEntryToIpe(const IpeBufferListNode *node, uint32_t i static void traceIPEFromHashTable(void *data STG_UNUSED, StgWord key STG_UNUSED, const void *value) { const IpeMapEntry *map_ent = (const IpeMapEntry *)value; - const InfoProvEnt ipe = ipeBufferEntryToIpe(map_ent->node, map_ent->idx); - traceIPE(&ipe); + if (ipe_node_valid(map_ent->node)){ + const InfoProvEnt ipe = ipeBufferEntryToIpe(map_ent->node, map_ent->idx); + traceIPE(&ipe); + } } void dumpIPEToEventLog(void) { // Dump pending entries IpeBufferListNode *node = RELAXED_LOAD(&ipeBufferList); while (node != NULL) { - decompressIPEBufferListNodeIfCompressed(node); + if (ipe_node_valid(node)){ + decompressIPEBufferListNodeIfCompressed(node); - for (uint32_t i = 0; i < node->count; i++) { - const InfoProvEnt ent = ipeBufferEntryToIpe(node, i); - traceIPE(&ent); + for (uint32_t i = 0; i < node->count; i++) { + const InfoProvEnt ent = ipeBufferEntryToIpe(node, i); + traceIPE(&ent); + } } node = node->next; } @@ -165,11 +206,30 @@ ipeMapLock; we instead use atomic CAS operations to add to the list. A performance test for IPE registration and lookup can be found here: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/5724#note_370806 + +Note that IPEs are still regiestered even if the .ipe section is stripped. That's +because you may still want to query what the unique identifier for an info table is +so it can be reconciled with previously extracted metadata information. For example, +when `-hi` profiling or using `whereFrom`. + */ void registerInfoProvList(IpeBufferListNode *node) { + + // Grab a fresh module_id + uint32_t module_id; + StgWord temp_module_id; + while (true) { + temp_module_id = next_module_id; + if (cas(&next_module_id, temp_module_id, temp_module_id+1) == temp_module_id) { + module_id = (uint32_t) temp_module_id; + break; + } + + } while (true) { IpeBufferListNode *old = RELAXED_LOAD(&ipeBufferList); node->next = old; + node->node_id = module_id; if (cas_ptr((volatile void **) &ipeBufferList, old, node) == (void *) old) { return; } @@ -183,7 +243,7 @@ void formatClosureDescIpe(const InfoProvEnt *ipe_buf, char *str_buf) { bool lookupIPE(const StgInfoTable *info, InfoProvEnt *out) { updateIpeMap(); IpeMapEntry *map_ent = (IpeMapEntry *) lookupHashTable(ipeMap, (StgWord)info); - if (map_ent) { + if (map_ent && ipe_node_valid(map_ent->node)) { *out = ipeBufferEntryToIpe(map_ent->node, map_ent->idx); return true; } else { @@ -191,6 +251,18 @@ bool lookupIPE(const StgInfoTable *info, InfoProvEnt *out) { } } +// Returns 0 when the info table is not present in the info table map. +// See Note [Stable identifiers for IPE entries] +uint64_t lookupIPEId(const StgInfoTable *info) { + updateIpeMap(); + IpeMapEntry *map_ent = (IpeMapEntry *) lookupHashTable(ipeMap, (StgWord)(info)); + if (map_ent){ + return IPE_ENTRY_KEY(*map_ent); + } else { + return 0; + } +} + void updateIpeMap(void) { // Check if there's any work at all. If not so, we can circumvent locking, // which decreases performance. ===================================== rts/ProfHeap.c ===================================== @@ -23,6 +23,7 @@ #include "Printer.h" #include "Trace.h" #include "sm/GCThread.h" +#include "IPE.h" #include <fs_rts.h> #include <string.h> @@ -230,9 +231,10 @@ closureIdentity( const StgClosure *p ) return closure_type_names[info->type]; } } - case HEAP_BY_INFO_TABLE: { - return get_itbl(p); - } + case HEAP_BY_INFO_TABLE: + { + return (void *) (p->header.info); + } default: barf("closureIdentity"); @@ -853,6 +855,20 @@ aggregateCensusInfo( void ) } #endif +static void +recordIPEHeapSample(FILE *hp_file, uint64_t table_id, size_t count) +{ + // Print to heap profile file + fprintf(hp_file, "0x%" PRIx64, table_id); + + // Create label string for tracing + char str[100]; + sprintf(str, "0x%" PRIx64, table_id); + + // Emit the profiling sample (convert count to bytes) + traceHeapProfSampleString(str, count * sizeof(W_)); +} + /* ----------------------------------------------------------------------------- * Print out the results of a heap census. * -------------------------------------------------------------------------- */ @@ -915,6 +931,11 @@ dumpCensus( Census *census ) } #endif + // Census entries which we need to group together. + // Used by IPE profiling to group together bands which don't have IPE information. + // Printing at the end in the 0 band + uint64_t uncategorised_count = 0; + for (ctr = census->ctrs; ctr != NULL; ctr = ctr->next) { #if defined(PROFILING) @@ -945,11 +966,15 @@ dumpCensus( Census *census ) count * sizeof(W_)); break; case HEAP_BY_INFO_TABLE: - fprintf(hp_file, "%p", ctr->identity); - char str[100]; - sprintf(str, "%p", ctr->identity); - traceHeapProfSampleString(str, count * sizeof(W_)); + { + uint64_t table_id = lookupIPEId(ctr->identity); + if (! table_id) { + uncategorised_count += count; + continue; + } + recordIPEHeapSample(hp_file, table_id, count); break; + } #if defined(PROFILING) case HEAP_BY_CCS: fprint_ccs(hp_file, (CostCentreStack *)ctr->identity, @@ -1002,6 +1027,16 @@ dumpCensus( Census *census ) fprintf(hp_file, "\t%" FMT_Word "\n", (W_)count * sizeof(W_)); } + // Print the unallocated data into the 0 band for info table profiling. + switch (RtsFlags.ProfFlags.doHeapProfile) { + case HEAP_BY_INFO_TABLE: + recordIPEHeapSample(hp_file, 0, uncategorised_count); + break; + default: + ASSERT(uncategorised_count == 0); + break; + } + traceHeapProfSampleEnd(era); printSample(false, census->time); ===================================== rts/eventlog/EventLog.c ===================================== @@ -1480,7 +1480,7 @@ void postIPE(const InfoProvEnt *ipe) CHECK(!ensureRoomForVariableEvent(&eventBuf, len)); postEventHeader(&eventBuf, EVENT_IPE); postPayloadSize(&eventBuf, len); - postWord64(&eventBuf, (StgWord) INFO_PTR_TO_STRUCT(ipe->info)); + postWord64(&eventBuf, (StgWord) (ipe->prov.info_prov_id)); postStringLen(&eventBuf, ipe->prov.table_name, table_name_len); postStringLen(&eventBuf, closure_desc_buf, closure_desc_len); postStringLen(&eventBuf, ipe->prov.ty_desc, ty_desc_len); ===================================== rts/include/rts/IPE.h ===================================== @@ -14,6 +14,7 @@ #pragma once typedef struct InfoProv_ { + uint64_t info_prov_id; const char *table_name; uint32_t closure_desc; // closure type const char *ty_desc; @@ -63,9 +64,37 @@ typedef struct { GHC_STATIC_ASSERT(sizeof(IpeBufferEntry) % (WORD_SIZE_IN_BITS / 8) == 0, "sizeof(IpeBufferEntry) must be a multiple of the word size"); +// The magic word is IPE\nIPE\n, which occupies the full 64 bit width of a word. +// See Note [IPE Stripping and magic words] +#define IPE_MAGIC_WORD 0x4950450049504500UL + +// Heap profiling currently requires a 32 bit pointer.. so for now just truncate +// the key to fit. It should still be big enough. +#if SIZEOF_VOID_P == 4 +// On 32-bit systems: keep lower 16 bits of module_id and idx +#define IPE_PROF_KEY(key64) \ + (uint32_t)((((key64) >> 16) & 0xFFFF0000) | ((key64) & 0x0000FFFF)) +#else +// On 64-bit systems: use full key +#define IPE_PROF_KEY(key64) (key64) +#endif + +typedef struct { + StgWord64 magic; // Must be IPE_MAGIC_WORD + IpeBufferEntry entries[]; // Flexible array member +} IpeBufferEntryBlock; + +typedef struct { + StgWord64 magic; // Must be IPE_MAGIC_WORD + char string_table[]; // Flexible array member for string table +} IpeStringTableBlock; + typedef struct IpeBufferListNode_ { struct IpeBufferListNode_ *next; + // This field is filled in when the node is registered. + uint32_t node_id; + // Everything below is read-only and generated by the codegen // This flag should be treated as a boolean @@ -76,10 +105,10 @@ typedef struct IpeBufferListNode_ { // When TNTC is enabled, these will point to the entry code // not the info table itself. const StgInfoTable **tables; - IpeBufferEntry *entries; + IpeBufferEntryBlock *entries_block; StgWord entries_size; // decompressed size - const char *string_table; + const IpeStringTableBlock *string_table_block; StgWord string_table_size; // decompressed size // Shared by all entries @@ -98,6 +127,8 @@ void formatClosureDescIpe(const InfoProvEnt *ipe_buf, char *str_buf); // Returns true on success, initializes `out`. bool lookupIPE(const StgInfoTable *info, InfoProvEnt *out); +uint64_t lookupIPEId(const StgInfoTable *info); + #if defined(DEBUG) void printIPE(const StgInfoTable *info); #endif ===================================== testsuite/tests/rts/ipe/ipeMap.c ===================================== @@ -48,7 +48,8 @@ HaskellObj shouldFindOneIfItHasBeenRegistered(Capability *cap) { // Allocate buffers for IPE buffer list node IpeBufferListNode *node = malloc(sizeof(IpeBufferListNode)); node->tables = malloc(sizeof(StgInfoTable *)); - node->entries = malloc(sizeof(IpeBufferEntry)); + node->entries_block = malloc(sizeof(StgWord64) + sizeof(IpeBufferEntry)); + node->entries_block->magic = IPE_MAGIC_WORD; StringTable st; init_string_table(&st); @@ -61,9 +62,13 @@ HaskellObj shouldFindOneIfItHasBeenRegistered(Capability *cap) { node->compressed = 0; node->count = 1; node->tables[0] = get_itbl(fortyTwo); - node->entries[0] = makeAnyProvEntry(cap, &st, 42); + node->entries_block->entries[0] = makeAnyProvEntry(cap, &st, 42); node->entries_size = sizeof(IpeBufferEntry); - node->string_table = st.buffer; + + IpeStringTableBlock *string_table_block = malloc(sizeof(StgWord64) + st.size); + string_table_block->magic = IPE_MAGIC_WORD; + memcpy(string_table_block->string_table, st.buffer, st.size); + node->string_table_block = string_table_block; node->string_table_size = st.size; registerInfoProvList(node); @@ -90,7 +95,8 @@ void shouldFindTwoIfTwoHaveBeenRegistered(Capability *cap, // Allocate buffers for IPE buffer list node IpeBufferListNode *node = malloc(sizeof(IpeBufferListNode)); node->tables = malloc(sizeof(StgInfoTable *)); - node->entries = malloc(sizeof(IpeBufferEntry)); + node->entries_block = malloc(sizeof(StgWord64) + sizeof(IpeBufferEntry)); + node->entries_block->magic = IPE_MAGIC_WORD; StringTable st; init_string_table(&st); @@ -103,9 +109,12 @@ void shouldFindTwoIfTwoHaveBeenRegistered(Capability *cap, node->compressed = 0; node->count = 1; node->tables[0] = get_itbl(twentyThree); - node->entries[0] = makeAnyProvEntry(cap, &st, 23); + node->entries_block->entries[0] = makeAnyProvEntry(cap, &st, 23); node->entries_size = sizeof(IpeBufferEntry); - node->string_table = st.buffer; + IpeStringTableBlock *string_table_block = malloc(sizeof(StgWord64) + st.size); + string_table_block->magic = IPE_MAGIC_WORD; + memcpy(string_table_block->string_table, st.buffer, st.size); + node->string_table_block = string_table_block; node->string_table_size = st.size; registerInfoProvList(node); @@ -121,7 +130,8 @@ void shouldFindTwoFromTheSameList(Capability *cap) { // Allocate buffers for IPE buffer list node IpeBufferListNode *node = malloc(sizeof(IpeBufferListNode)); node->tables = malloc(sizeof(StgInfoTable *) * 2); - node->entries = malloc(sizeof(IpeBufferEntry) * 2); + node->entries_block = malloc(sizeof(StgWord64) + sizeof(IpeBufferEntry) * 2); + node->entries_block->magic = IPE_MAGIC_WORD; StringTable st; init_string_table(&st); @@ -133,10 +143,13 @@ void shouldFindTwoFromTheSameList(Capability *cap) { node->count = 2; node->tables[0] = get_itbl(one); node->tables[1] = get_itbl(two); - node->entries[0] = makeAnyProvEntry(cap, &st, 1); - node->entries[1] = makeAnyProvEntry(cap, &st, 2); + node->entries_block->entries[0] = makeAnyProvEntry(cap, &st, 1); + node->entries_block->entries[1] = makeAnyProvEntry(cap, &st, 2); node->entries_size = sizeof(IpeBufferEntry) * 2; - node->string_table = st.buffer; + IpeStringTableBlock *string_table_block = malloc(sizeof(StgWord64) + st.size); + string_table_block->magic = IPE_MAGIC_WORD; + memcpy(string_table_block->string_table, st.buffer, st.size); + node->string_table_block = string_table_block; node->string_table_size = st.size; registerInfoProvList(node); @@ -152,7 +165,11 @@ void shouldDealWithAnEmptyList(Capability *cap, HaskellObj fortyTwo) { IpeBufferListNode *node = malloc(sizeof(IpeBufferListNode)); node->count = 0; node->next = NULL; - node->string_table = ""; + IpeStringTableBlock *string_table_block = malloc(sizeof(StgWord64)); + string_table_block->magic = IPE_MAGIC_WORD; + + node->entries_block = malloc(sizeof(StgWord64)); + node->entries_block->magic = IPE_MAGIC_WORD; registerInfoProvList(node); ===================================== testsuite/tests/rts/ipe/ipe_lib.c ===================================== @@ -64,7 +64,8 @@ IpeBufferListNode *makeAnyProvEntries(Capability *cap, int start, int end) { // Allocate buffers for IpeBufferListNode IpeBufferListNode *node = malloc(sizeof(IpeBufferListNode)); node->tables = malloc(sizeof(StgInfoTable *) * n); - node->entries = malloc(sizeof(IpeBufferEntry) * n); + node->entries_block = malloc(sizeof(StgWord64) + sizeof(IpeBufferEntry) * n); + node->entries_block->magic = IPE_MAGIC_WORD; StringTable st; init_string_table(&st); @@ -83,14 +84,19 @@ IpeBufferListNode *makeAnyProvEntries(Capability *cap, int start, int end) { for (int i=start; i < end; i++) { HaskellObj closure = rts_mkInt(cap, 42); node->tables[i] = get_itbl(closure); - node->entries[i] = makeAnyProvEntry(cap, &st, i); + node->entries_block->entries[i] = makeAnyProvEntry(cap, &st, i); } // Set the rest of the fields node->next = NULL; node->compressed = 0; node->count = n; - node->string_table = st.buffer; + + IpeStringTableBlock *string_table_block = + malloc(sizeof(StgWord64) + st.size); + string_table_block->magic = IPE_MAGIC_WORD; + memcpy(string_table_block->string_table, st.buffer, st.size); + node->string_table_block = string_table_block; return node; } View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/358bc4fc8324a0685f336142d0d608c... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/358bc4fc8324a0685f336142d0d608c... 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