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[Wasm RyuJIT] Wire up GC info encoding/decoding for Wasm #126932

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[Wasm RyuJIT] Wire up GC info encoding/decoding for Wasm #126932

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99fdef6
Checkpoint gcinfo wire-up
kg Apr 15, 2026
ce54c49
Always disable tracked GC slots for Wasm
kg Apr 28, 2026
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1 change: 1 addition & 0 deletions src/coreclr/gcinfo/CMakeLists.txt
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Expand Up @@ -66,6 +66,7 @@ endif()
if (CLR_CMAKE_TARGET_ARCH_ARM64 OR CLR_CMAKE_TARGET_ARCH_AMD64)
create_gcinfo_lib(TARGET gcinfo_universal_arm64 OS universal ARCH arm64)
create_gcinfo_lib(TARGET gcinfo_unix_x64 OS unix ARCH x64)
create_gcinfo_lib(TARGET gcinfo_universal_wasm OS universal ARCH wasm)
if (CLR_CMAKE_BUILD_COMMUNITY_ALTJITS EQUAL 1)
create_gcinfo_lib(TARGET gcinfo_unix_loongarch64 OS unix ARCH loongarch64)
create_gcinfo_lib(TARGET gcinfo_unix_riscv64 OS unix ARCH riscv64)
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2 changes: 0 additions & 2 deletions src/coreclr/gcinfo/gcinfoencoder.cpp
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Expand Up @@ -2634,10 +2634,8 @@ int BitStreamWriter::EncodeVarLengthSigned( SSIZE_T n, UINT32 base )
}
}

#ifndef TARGET_WASM
// Instantiate the encoder so other files can use it
template class TGcInfoEncoder<TargetGcInfoEncoding>;
#endif // !TARGET_WASM

#ifdef FEATURE_INTERPRETER
template class TGcInfoEncoder<InterpreterGcInfoEncoding>;
Expand Down
51 changes: 49 additions & 2 deletions src/coreclr/inc/gcinfotypes.h
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Expand Up @@ -909,13 +909,60 @@ struct X86GcInfoEncoding {
static const bool HAS_FIXED_STACK_PARAMETER_SCRATCH_AREA = true;
};

#elif defined(TARGET_WASM)
#elif defined(TARGET_WASM) && !defined(TARGET_64BIT)

#ifndef TARGET_POINTER_SIZE
#define TARGET_POINTER_SIZE 4 // equal to sizeof(void*) and the managed pointer size in bytes for this target
#endif
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#define TargetGcInfoEncoding InterpreterGcInfoEncoding
#define TargetGcInfoEncoding Wasm32GcInfoEncoding

struct Wasm32GcInfoEncoding {
static const uint32_t NUM_NORM_CODE_OFFSETS_PER_CHUNK = (64);
static const uint32_t NUM_NORM_CODE_OFFSETS_PER_CHUNK_LOG2 = (6);
static inline constexpr int32_t NORMALIZE_STACK_SLOT (int32_t x) { return (x); }
static inline constexpr int32_t DENORMALIZE_STACK_SLOT (int32_t x) { return (x); }
static inline constexpr uint32_t NORMALIZE_CODE_LENGTH (uint32_t x) { return (x); }
static inline constexpr uint32_t DENORMALIZE_CODE_LENGTH (uint32_t x) { return (x); }
static inline constexpr uint32_t NORMALIZE_STACK_BASE_REGISTER (uint32_t x) { return (x); }
static inline constexpr uint32_t DENORMALIZE_STACK_BASE_REGISTER (uint32_t x) { return (x); }
static inline constexpr uint32_t NORMALIZE_SIZE_OF_STACK_AREA (uint32_t x) { return (x); }
static inline constexpr uint32_t DENORMALIZE_SIZE_OF_STACK_AREA (uint32_t x) { return (x); }
static const bool CODE_OFFSETS_NEED_NORMALIZATION = false;
static inline constexpr uint32_t NORMALIZE_CODE_OFFSET (uint32_t x) { return (x); }
static inline constexpr uint32_t DENORMALIZE_CODE_OFFSET (uint32_t x) { return (x); }

static const int PSP_SYM_STACK_SLOT_ENCBASE = 6;
static const int GENERICS_INST_CONTEXT_STACK_SLOT_ENCBASE = 6;
static const int SECURITY_OBJECT_STACK_SLOT_ENCBASE = 6;
static const int GS_COOKIE_STACK_SLOT_ENCBASE = 6;
static const int CODE_LENGTH_ENCBASE = 6;
static const int SIZE_OF_RETURN_KIND_IN_SLIM_HEADER = 2;
static const int SIZE_OF_RETURN_KIND_IN_FAT_HEADER = 2;
static const int STACK_BASE_REGISTER_ENCBASE = 3;
static const int SIZE_OF_STACK_AREA_ENCBASE = 6;
static const int SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA_ENCBASE = 3;
static const int REVERSE_PINVOKE_FRAME_ENCBASE = 6;
static const int NUM_REGISTERS_ENCBASE = 3;
static const int NUM_STACK_SLOTS_ENCBASE = 5;
static const int NUM_UNTRACKED_SLOTS_ENCBASE = 5;
static const int NORM_PROLOG_SIZE_ENCBASE = 4;
static const int NORM_EPILOG_SIZE_ENCBASE = 3;
static const int NORM_CODE_OFFSET_DELTA_ENCBASE = 3;
static const int INTERRUPTIBLE_RANGE_DELTA1_ENCBASE = 5;
static const int INTERRUPTIBLE_RANGE_DELTA2_ENCBASE = 5;
static const int REGISTER_ENCBASE = 3;
static const int REGISTER_DELTA_ENCBASE = REGISTER_ENCBASE;
static const int STACK_SLOT_ENCBASE = 6;
static const int STACK_SLOT_DELTA_ENCBASE = 4;
static const int NUM_SAFE_POINTS_ENCBASE = 4;
static const int NUM_INTERRUPTIBLE_RANGES_ENCBASE = 1;
static const int NUM_EH_CLAUSES_ENCBASE = 2;
static const int POINTER_SIZE_ENCBASE = 3;
static const int LIVESTATE_RLE_RUN_ENCBASE = 2;
static const int LIVESTATE_RLE_SKIP_ENCBASE = 4;
static const bool HAS_FIXED_STACK_PARAMETER_SCRATCH_AREA = false;
};

#else // No target defined

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4 changes: 3 additions & 1 deletion src/coreclr/jit/CMakeLists.txt
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Expand Up @@ -23,7 +23,7 @@ function(create_standalone_jit)

if(TARGETDETAILS_OS STREQUAL "unix_osx" OR TARGETDETAILS_OS STREQUAL "unix_anyos")
set(JIT_ARCH_LINK_LIBRARIES gcinfo_unix_${TARGETDETAILS_ARCH})
elseif(NOT ${TARGETDETAILS_ARCH} MATCHES "wasm")
else()
set(JIT_ARCH_LINK_LIBRARIES gcinfo_${TARGETDETAILS_OS}_${TARGETDETAILS_ARCH})
endif()
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Expand Down Expand Up @@ -292,6 +292,8 @@ set( JIT_RISCV64_SOURCES
)

set( JIT_WASM_SOURCES
gcdecode.cpp
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@SingleAccretion SingleAccretion Apr 21, 2026

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The more proper way to add these files is by moving them from JIT_NATIVE_TARGET_SOURCES to JIT_SOURCES.

gcencode.cpp
codegenwasm.cpp
emitwasm.cpp
fgwasm.cpp
Expand Down
18 changes: 12 additions & 6 deletions src/coreclr/jit/codegencommon.cpp
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Expand Up @@ -854,7 +854,9 @@ bool CodeGen::genIsSameLocalVar(GenTree* op1, GenTree* op2)
// inline
void CodeGenInterface::genUpdateRegLife(const LclVarDsc* varDsc, bool isBorn, bool isDying DEBUGARG(GenTree* tree))
{
#if EMIT_GENERATE_GCINFO // The regset being updated here is only needed for codegen-level GCness tracking
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// The regset being updated here is only needed for codegen-level GCness tracking,
// and Wasm does not have registers
regMaskTP regMask = genGetRegMask(varDsc);

#ifdef DEBUG
Expand Down Expand Up @@ -884,7 +886,7 @@ void CodeGenInterface::genUpdateRegLife(const LclVarDsc* varDsc, bool isBorn, bo
assert(varDsc->IsAlwaysAliveInMemory() || ((regSet.GetMaskVars() & regMask) == 0));
regSet.AddMaskVars(regMask);
}
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM
}

#ifndef TARGET_WASM
Expand Down Expand Up @@ -1032,6 +1034,7 @@ void Compiler::compChangeLife(VARSET_VALARG_TP newLife)
bool isByRef = varDsc->TypeIs(TYP_BYREF);
bool isInReg = varDsc->lvIsInReg();
bool isInMemory = !isInReg || varDsc->IsAlwaysAliveInMemory();
#ifndef TARGET_WASM
if (isInReg)
{
// TODO-Cleanup: Move the code from compUpdateLifeVar to genUpdateRegLife that updates the
Expand All @@ -1047,7 +1050,8 @@ void Compiler::compChangeLife(VARSET_VALARG_TP newLife)
}
codeGen->genUpdateRegLife(varDsc, false /*isBorn*/, true /*isDying*/ DEBUGARG(nullptr));
}
// Update the gcVarPtrSetCur if it is in memory.
#endif // !TARGET_WASM
// Update the gcVarPtrSetCur if it is in memory.
if (isInMemory && (isGCRef || isByRef))
{
VarSetOps::RemoveElemD(this, codeGen->gcInfo.gcVarPtrSetCur, deadVarIndex);
Comment on lines +1053 to 1057
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Copilot AI Apr 20, 2026

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On TARGET_WASM the register-handling block above is compiled out, but the logic below only updates gcVarPtrSetCur when isInMemory is true. Since the Wasm reg allocator can enregister TYP_REF/TYP_BYREF locals (see src/coreclr/jit/regalloc.cpp:434-446), isInMemory can be false for GC-tracked locals and they won't be removed from (or added to) gcVarPtrSetCur correctly, producing incorrect stack-root reporting in the encoded GC info. Consider either (1) preventing GC-tracked locals from being enregistered on Wasm, or (2) keeping a real stack home for GC refs and ensuring gcVarPtrSetCur reflects it, or (3) implementing register-slot tracking/encoding for Wasm instead of compiling it out.

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@kg kg Apr 20, 2026

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This sounds like it could be a real problem, thoughts @AndyAyersMS @SingleAccretion ? I think out of its proposed options, 3 doesn't make sense and 1 would make our performance terrible. I think the plan was that we'd spill any enregistered gc refs to memory before safe points, yeah? Which is roughly 2. Wondering if this indicates a change I need to make.

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I don't think we should be enabling this liveness tracking (EMIT_GENERATE_GCINFO) infrastructure back in any case. It's useless - all the GC locals should be described by untracked (thus live for the entire method) slots anyhow.

As for the spilling and such, yes, we'll need to spill. For now you can disable enregistration of locals that have GC pointers to make it correct (not fully correct though, since SDSDu need to be handled too, but that can be added separately).

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@AndyAyersMS AndyAyersMS Apr 21, 2026

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Yeah I agree, we aren't going find a use for any of the emitter-driven info for GC tracking.

For an initial PR I think a good goal would be to just enable emission of the GC Info data to the host, without any GC slot reporting of any kind. This should be sufficient for conservative scanning and provide other information the runtime needs for various purposes.

It might also unearth some interesting questions that we'll need to come to terms with sooner or later.

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@kg kg Apr 22, 2026

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OK, I'll switch emit_generate_gcinfo back to 0, thank you both!

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@kg kg Apr 22, 2026

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The problem is that with it set to 0, various parts of gcencode etc don't build. I don't think this is a configuration we actually support.

Expand All @@ -1070,6 +1074,7 @@ void Compiler::compChangeLife(VARSET_VALARG_TP newLife)
bool isByRef = varDsc->TypeIs(TYP_BYREF);
if (varDsc->lvIsInReg())
{
#ifndef TARGET_WASM
// If this variable is going live in a register, it is no longer live on the stack,
// unless it is an EH/"spill at single-def" var, which always remains live on the stack.
if (!varDsc->IsAlwaysAliveInMemory())
Expand All @@ -1092,6 +1097,7 @@ void Compiler::compChangeLife(VARSET_VALARG_TP newLife)
{
codeGen->gcInfo.gcRegByrefSetCur |= regMask;
}
#endif // !TARGET_WASM
}
else if (lvaIsGCTracked(varDsc))
{
Expand Down Expand Up @@ -1769,7 +1775,7 @@ void CodeGen::genExitCode(BasicBlock* block)

genIPmappingAdd(IPmappingDscKind::Epilog, DebugInfo(), true);

#if EMIT_GENERATE_GCINFO && defined(DEBUG)
#if EMIT_GENERATE_GCINFO && defined(DEBUG) && !defined(TARGET_WASM)
// For returnining epilogs do some validation that the GC info looks right.
if (!block->HasFlag(BBF_HAS_JMP))
{
Expand All @@ -1791,7 +1797,7 @@ void CodeGen::genExitCode(BasicBlock* block)
}
}
}
#endif // EMIT_GENERATE_GCINFO && defined(DEBUG)
#endif // EMIT_GENERATE_GCINFO && defined(DEBUG) && !defined(TARGET_WASM)

if (m_compiler->getNeedsGSSecurityCookie())
{
Expand Down Expand Up @@ -7210,7 +7216,7 @@ void CodeGen::genReturn(GenTree* treeNode)
}
}

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
if (treeNode->OperIs(GT_RETURN, GT_SWIFT_ERROR_RET))
{
genMarkReturnGCInfo();
Expand Down
20 changes: 14 additions & 6 deletions src/coreclr/jit/codegenlinear.cpp
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Expand Up @@ -259,7 +259,7 @@ void CodeGen::genCodeForBlock(BasicBlock* block)
// and before first of the current block is emitted
genUpdateLife(block->bbLiveIn);

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// Even if liveness didn't change, we need to update the registers containing GC references.
// genUpdateLife will update the registers live due to liveness changes. But what about registers that didn't
// change? We cleared them out above. Maybe we should just not clear them out, but update the ones that change
Expand Down Expand Up @@ -353,7 +353,7 @@ void CodeGen::genCodeForBlock(BasicBlock* block)
}
}
}
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM

/* Start a new code output block */

Expand Down Expand Up @@ -405,6 +405,14 @@ void CodeGen::genCodeForBlock(BasicBlock* block)
}
#endif

#ifdef TARGET_WASM
// FIXME-WASM: Why is this only necessary on Wasm?
if (m_compiler->bbIsFuncletBeg(block))
{
needLabel = true;
}
#endif

if (needLabel)
{
// Mark a label and update the current set of live GC refs
Expand Down Expand Up @@ -569,7 +577,7 @@ void CodeGen::genCodeForBlock(BasicBlock* block)

regSet.rsSpillChk();

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// Make sure we didn't bungle pointer register tracking
regMaskTP ptrRegs = gcInfo.gcRegGCrefSetCur | gcInfo.gcRegByrefSetCur;
regMaskTP nonVarPtrRegs = ptrRegs & ~regSet.GetMaskVars();
Expand Down Expand Up @@ -618,7 +626,7 @@ void CodeGen::genCodeForBlock(BasicBlock* block)
}

noway_assert(nonVarPtrRegs == RBM_NONE);
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM
#endif // DEBUG

#if defined(DEBUG)
Expand Down Expand Up @@ -1601,7 +1609,7 @@ regNumber CodeGen::genConsumeReg(GenTree* tree)
// genUpdateLife() will also spill local var if marked as GTF_SPILL by calling CodeGen::genSpillVar
genUpdateLife(tree);

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// there are three cases where consuming a reg means clearing the bit in the live mask
// 1. it was not produced by a local
// 2. it was produced by a local that is going dead
Expand Down Expand Up @@ -1659,7 +1667,7 @@ regNumber CodeGen::genConsumeReg(GenTree* tree)
{
gcInfo.gcMarkRegSetNpt(tree->gtGetRegMask());
}
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM

genCheckConsumeNode(tree);
return tree->GetRegNum();
Expand Down
37 changes: 36 additions & 1 deletion src/coreclr/jit/codegenwasm.cpp
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Expand Up @@ -9,6 +9,8 @@
#include "codegen.h"
#include "regallocwasm.h"
#include "fgwasm.h"
#include "gcinfo.h"
#include "gcinfoencoder.h"

static const int LINEAR_MEMORY_INDEX = 0;

Expand Down Expand Up @@ -3366,7 +3368,40 @@ void CodeGen::inst_JMP(emitJumpKind jmp, BasicBlock* tgtBlock)

void CodeGen::genCreateAndStoreGCInfo(unsigned codeSize, unsigned prologSize, unsigned epilogSize DEBUGARG(void* code))
{
// GCInfo not captured/created by codegen.
IAllocator* allowZeroAlloc = new (m_compiler, CMK_GC) CompIAllocator(m_compiler->getAllocatorGC());
GcInfoEncoder* gcInfoEncoder = new (m_compiler, CMK_GC)
GcInfoEncoder(m_compiler->info.compCompHnd, m_compiler->info.compMethodInfo, allowZeroAlloc, NOMEM);
assert(gcInfoEncoder != nullptr);

// Follow the code pattern of the x86 gc info encoder (genCreateAndStoreGCInfoJIT32).
gcInfo.gcInfoBlockHdrSave(gcInfoEncoder, codeSize, prologSize);

// We keep the call count for the second call to gcMakeRegPtrTable() below.
unsigned callCnt = 0;

// First we figure out the encoder ID's for the stack slots and registers.
gcInfo.gcMakeRegPtrTable(gcInfoEncoder, codeSize, prologSize, GCInfo::MAKE_REG_PTR_MODE_ASSIGN_SLOTS, &callCnt);

// Now we've requested all the slots we'll need; "finalize" these (make more compact data structures for them).
gcInfoEncoder->FinalizeSlotIds();

// Now we can actually use those slot ID's to declare live ranges.
gcInfo.gcMakeRegPtrTable(gcInfoEncoder, codeSize, prologSize, GCInfo::MAKE_REG_PTR_MODE_DO_WORK, &callCnt);

if (m_compiler->opts.IsReversePInvoke())
{
unsigned reversePInvokeFrameVarNumber = m_compiler->lvaReversePInvokeFrameVar;
assert(reversePInvokeFrameVarNumber != BAD_VAR_NUM);
const LclVarDsc* reversePInvokeFrameVar = m_compiler->lvaGetDesc(reversePInvokeFrameVarNumber);
gcInfoEncoder->SetReversePInvokeFrameSlot(reversePInvokeFrameVar->GetStackOffset());
}

gcInfoEncoder->Build();

// GC Encoder automatically puts the GC info in the right spot using ICorJitInfo::allocGCInfo(size_t)
// let's save the values anyway for debugging purposes
m_compiler->compInfoBlkAddr = gcInfoEncoder->Emit();
m_compiler->compInfoBlkSize = gcInfoEncoder->GetEncodedGCInfoSize();
}

//---------------------------------------------------------------------
Expand Down
16 changes: 8 additions & 8 deletions src/coreclr/jit/emit.cpp
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Expand Up @@ -9076,7 +9076,7 @@ void emitter::emitUpdateLiveGCregs(GCtype gcType, regMaskTP regs, BYTE* addr)
return;
}

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
regMaskTP life;
regMaskTP dead;
regMaskTP chg;
Expand Down Expand Up @@ -9131,7 +9131,7 @@ void emitter::emitUpdateLiveGCregs(GCtype gcType, regMaskTP regs, BYTE* addr)
// The 2 GC reg masks can't be overlapping

assert((emitThisGCrefRegs & emitThisByrefRegs) == 0);
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM
}

/*****************************************************************************
Expand Down Expand Up @@ -9434,7 +9434,7 @@ void emitter::emitGCregLiveUpd(GCtype gcType, regNumber reg, BYTE* addr)
{
assert(emitIssuing);

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// Don't track GC changes in epilogs
if (emitIGisInEpilog(emitCurIG))
{
Expand Down Expand Up @@ -9476,7 +9476,7 @@ void emitter::emitGCregLiveUpd(GCtype gcType, regNumber reg, BYTE* addr)
// The 2 GC reg masks can't be overlapping

assert((emitThisGCrefRegs & emitThisByrefRegs) == 0);
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM
}

/*****************************************************************************
Expand All @@ -9494,7 +9494,7 @@ void emitter::emitGCregDeadUpdMask(regMaskTP regs, BYTE* addr)
return;
}

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// First, handle the gcref regs going dead

regMaskTP gcrefRegs = emitThisGCrefRegs & regs;
Expand Down Expand Up @@ -9530,7 +9530,7 @@ void emitter::emitGCregDeadUpdMask(regMaskTP regs, BYTE* addr)

emitThisByrefRegs &= ~byrefRegs;
}
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM
}

/*****************************************************************************
Expand All @@ -9542,7 +9542,7 @@ void emitter::emitGCregDeadUpd(regNumber reg, BYTE* addr)
{
assert(emitIssuing);

#if EMIT_GENERATE_GCINFO
#if EMIT_GENERATE_GCINFO && !defined(TARGET_WASM)
// Don't track GC changes in epilogs
if (emitIGisInEpilog(emitCurIG))
{
Expand Down Expand Up @@ -9571,7 +9571,7 @@ void emitter::emitGCregDeadUpd(regNumber reg, BYTE* addr)

emitThisByrefRegs &= ~regMask;
}
#endif // EMIT_GENERATE_GCINFO
#endif // EMIT_GENERATE_GCINFO && !TARGET_WASM
}

/*****************************************************************************
Expand Down
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