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RustWrapper.cpp
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#include "LLVMWrapper.h"
#include "llvm-c/Analysis.h"
#include "llvm-c/Core.h"
#include "llvm-c/DebugInfo.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DiagnosticHandler.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicsARM.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LLVMRemarkStreamer.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Value.h"
#include "llvm/Object/COFFImportFile.h"
#include "llvm/Remarks/RemarkFormat.h"
#include "llvm/Remarks/RemarkSerializer.h"
#include "llvm/Remarks/RemarkStreamer.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/ModRef.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/ToolOutputFile.h"
#include <iostream>
// for raw `write` in the bad-alloc handler
#ifdef _MSC_VER
#include <io.h>
#else
#include <unistd.h>
#endif
//===----------------------------------------------------------------------===
//
// This file defines alternate interfaces to core functions that are more
// readily callable by Rust's FFI.
//
//===----------------------------------------------------------------------===
using namespace llvm;
using namespace llvm::sys;
using namespace llvm::object;
// This opcode is an LLVM detail that could hypothetically change (?), so
// verify that the hard-coded value in `dwarf_const.rs` still agrees with LLVM.
static_assert(dwarf::DW_OP_LLVM_fragment == 0x1000);
// LLVMAtomicOrdering is already an enum - don't create another
// one.
static AtomicOrdering fromRust(LLVMAtomicOrdering Ordering) {
switch (Ordering) {
case LLVMAtomicOrderingNotAtomic:
return AtomicOrdering::NotAtomic;
case LLVMAtomicOrderingUnordered:
return AtomicOrdering::Unordered;
case LLVMAtomicOrderingMonotonic:
return AtomicOrdering::Monotonic;
case LLVMAtomicOrderingAcquire:
return AtomicOrdering::Acquire;
case LLVMAtomicOrderingRelease:
return AtomicOrdering::Release;
case LLVMAtomicOrderingAcquireRelease:
return AtomicOrdering::AcquireRelease;
case LLVMAtomicOrderingSequentiallyConsistent:
return AtomicOrdering::SequentiallyConsistent;
}
report_fatal_error("Invalid LLVMAtomicOrdering value!");
}
static LLVM_THREAD_LOCAL char *LastError;
// Custom error handler for fatal LLVM errors.
//
// Notably it exits the process with code 101, unlike LLVM's default of 1.
static void FatalErrorHandler(void *UserData, const char *Reason,
bool GenCrashDiag) {
// Once upon a time we emitted "LLVM ERROR:" specifically to mimic LLVM. Then,
// we developed crater and other tools which only expose logs, not error
// codes. Use a more greppable prefix that will still match the "LLVM ERROR:"
// prefix.
std::cerr << "rustc-LLVM ERROR: " << Reason << std::endl;
// Since this error handler exits the process, we have to run any cleanup that
// LLVM would run after handling the error. This might change with an LLVM
// upgrade.
//
// In practice, this will do nothing, because the only cleanup LLVM does is
// to remove all files that were registered with it via a frontend calling
// one of the `createOutputFile` family of functions in LLVM and passing true
// to RemoveFileOnSignal, something that rustc does not do. However, it would
// be... inadvisable to suddenly stop running these handlers, if LLVM gets
// "interesting" ideas in the future about what cleanup should be done.
// We might even find it useful for generating less artifacts.
sys::RunInterruptHandlers();
exit(101);
}
// Custom error handler for bad-alloc LLVM errors.
//
// It aborts the process without any further allocations, similar to LLVM's
// default except that may be configured to `throw std::bad_alloc()` instead.
static void BadAllocErrorHandler(void *UserData, const char *Reason,
bool GenCrashDiag) {
const char *OOM = "rustc-LLVM ERROR: out of memory\n";
(void)!::write(2, OOM, strlen(OOM));
(void)!::write(2, Reason, strlen(Reason));
(void)!::write(2, "\n", 1);
abort();
}
extern "C" void LLVMRustInstallErrorHandlers() {
install_bad_alloc_error_handler(BadAllocErrorHandler);
install_fatal_error_handler(FatalErrorHandler);
install_out_of_memory_new_handler();
}
extern "C" void LLVMRustDisableSystemDialogsOnCrash() {
sys::DisableSystemDialogsOnCrash();
}
extern "C" char *LLVMRustGetLastError(void) {
char *Ret = LastError;
LastError = nullptr;
return Ret;
}
extern "C" void LLVMRustSetLastError(const char *Err) {
free((void *)LastError);
LastError = strdup(Err);
}
extern "C" LLVMContextRef LLVMRustContextCreate(bool shouldDiscardNames) {
auto ctx = new LLVMContext();
ctx->setDiscardValueNames(shouldDiscardNames);
return wrap(ctx);
}
extern "C" void LLVMRustSetNormalizedTarget(LLVMModuleRef M,
const char *Target) {
#if LLVM_VERSION_GE(21, 0)
unwrap(M)->setTargetTriple(Triple(Triple::normalize(Target)));
#else
unwrap(M)->setTargetTriple(Triple::normalize(Target));
#endif
}
extern "C" void LLVMRustPrintPassTimings(RustStringRef OutBuf) {
auto OS = RawRustStringOstream(OutBuf);
TimerGroup::printAll(OS);
}
extern "C" void LLVMRustPrintStatistics(RustStringRef OutBuf) {
auto OS = RawRustStringOstream(OutBuf);
llvm::PrintStatistics(OS);
}
extern "C" LLVMValueRef LLVMRustGetNamedValue(LLVMModuleRef M, const char *Name,
size_t NameLen) {
return wrap(unwrap(M)->getNamedValue(StringRef(Name, NameLen)));
}
enum class LLVMRustVerifierFailureAction {
AbortProcessAction = 0,
PrintMessageAction = 1,
ReturnStatusAction = 2,
};
static LLVMVerifierFailureAction
fromRust(LLVMRustVerifierFailureAction Action) {
switch (Action) {
case LLVMRustVerifierFailureAction::AbortProcessAction:
return LLVMAbortProcessAction;
case LLVMRustVerifierFailureAction::PrintMessageAction:
return LLVMPrintMessageAction;
case LLVMRustVerifierFailureAction::ReturnStatusAction:
return LLVMReturnStatusAction;
}
report_fatal_error("Invalid LLVMVerifierFailureAction value!");
}
extern "C" LLVMBool
LLVMRustVerifyFunction(LLVMValueRef Fn, LLVMRustVerifierFailureAction Action) {
return LLVMVerifyFunction(Fn, fromRust(Action));
}
extern "C" LLVMValueRef LLVMRustGetOrInsertFunction(LLVMModuleRef M,
const char *Name,
size_t NameLen,
LLVMTypeRef FunctionTy) {
return wrap(unwrap(M)
->getOrInsertFunction(StringRef(Name, NameLen),
unwrap<FunctionType>(FunctionTy))
.getCallee());
}
extern "C" LLVMValueRef LLVMRustGetOrInsertGlobal(LLVMModuleRef M,
const char *Name,
size_t NameLen,
LLVMTypeRef Ty) {
Module *Mod = unwrap(M);
auto NameRef = StringRef(Name, NameLen);
// We don't use Module::getOrInsertGlobal because that returns a Constant*,
// which may either be the real GlobalVariable*, or a constant bitcast of it
// if our type doesn't match the original declaration. We always want the
// GlobalVariable* so we can access linkage, visibility, etc.
GlobalVariable *GV = Mod->getGlobalVariable(NameRef, true);
if (!GV)
GV = new GlobalVariable(*Mod, unwrap(Ty), false,
GlobalValue::ExternalLinkage, nullptr, NameRef);
return wrap(GV);
}
extern "C" LLVMValueRef LLVMRustInsertPrivateGlobal(LLVMModuleRef M,
LLVMTypeRef Ty) {
return wrap(new GlobalVariable(*unwrap(M), unwrap(Ty), false,
GlobalValue::PrivateLinkage, nullptr));
}
// Must match the layout of `rustc_codegen_llvm::llvm::ffi::AttributeKind`.
enum class LLVMRustAttributeKind {
AlwaysInline = 0,
ByVal = 1,
Cold = 2,
InlineHint = 3,
MinSize = 4,
Naked = 5,
NoAlias = 6,
NoCapture = 7,
NoInline = 8,
NonNull = 9,
NoRedZone = 10,
NoReturn = 11,
NoUnwind = 12,
OptimizeForSize = 13,
ReadOnly = 14,
SExt = 15,
StructRet = 16,
UWTable = 17,
ZExt = 18,
InReg = 19,
SanitizeThread = 20,
SanitizeAddress = 21,
SanitizeMemory = 22,
NonLazyBind = 23,
OptimizeNone = 24,
ReadNone = 26,
SanitizeHWAddress = 28,
WillReturn = 29,
StackProtectReq = 30,
StackProtectStrong = 31,
StackProtect = 32,
NoUndef = 33,
SanitizeMemTag = 34,
NoCfCheck = 35,
ShadowCallStack = 36,
AllocSize = 37,
AllocatedPointer = 38,
AllocAlign = 39,
SanitizeSafeStack = 40,
FnRetThunkExtern = 41,
Writable = 42,
DeadOnUnwind = 43,
};
static Attribute::AttrKind fromRust(LLVMRustAttributeKind Kind) {
switch (Kind) {
case LLVMRustAttributeKind::AlwaysInline:
return Attribute::AlwaysInline;
case LLVMRustAttributeKind::ByVal:
return Attribute::ByVal;
case LLVMRustAttributeKind::Cold:
return Attribute::Cold;
case LLVMRustAttributeKind::InlineHint:
return Attribute::InlineHint;
case LLVMRustAttributeKind::MinSize:
return Attribute::MinSize;
case LLVMRustAttributeKind::Naked:
return Attribute::Naked;
case LLVMRustAttributeKind::NoAlias:
return Attribute::NoAlias;
case LLVMRustAttributeKind::NoCapture:
#if LLVM_VERSION_GE(21, 0)
report_fatal_error("NoCapture doesn't exist in LLVM 21");
#else
return Attribute::NoCapture;
#endif
case LLVMRustAttributeKind::NoCfCheck:
return Attribute::NoCfCheck;
case LLVMRustAttributeKind::NoInline:
return Attribute::NoInline;
case LLVMRustAttributeKind::NonNull:
return Attribute::NonNull;
case LLVMRustAttributeKind::NoRedZone:
return Attribute::NoRedZone;
case LLVMRustAttributeKind::NoReturn:
return Attribute::NoReturn;
case LLVMRustAttributeKind::NoUnwind:
return Attribute::NoUnwind;
case LLVMRustAttributeKind::OptimizeForSize:
return Attribute::OptimizeForSize;
case LLVMRustAttributeKind::ReadOnly:
return Attribute::ReadOnly;
case LLVMRustAttributeKind::SExt:
return Attribute::SExt;
case LLVMRustAttributeKind::StructRet:
return Attribute::StructRet;
case LLVMRustAttributeKind::UWTable:
return Attribute::UWTable;
case LLVMRustAttributeKind::ZExt:
return Attribute::ZExt;
case LLVMRustAttributeKind::InReg:
return Attribute::InReg;
case LLVMRustAttributeKind::SanitizeThread:
return Attribute::SanitizeThread;
case LLVMRustAttributeKind::SanitizeAddress:
return Attribute::SanitizeAddress;
case LLVMRustAttributeKind::SanitizeMemory:
return Attribute::SanitizeMemory;
case LLVMRustAttributeKind::NonLazyBind:
return Attribute::NonLazyBind;
case LLVMRustAttributeKind::OptimizeNone:
return Attribute::OptimizeNone;
case LLVMRustAttributeKind::ReadNone:
return Attribute::ReadNone;
case LLVMRustAttributeKind::SanitizeHWAddress:
return Attribute::SanitizeHWAddress;
case LLVMRustAttributeKind::WillReturn:
return Attribute::WillReturn;
case LLVMRustAttributeKind::StackProtectReq:
return Attribute::StackProtectReq;
case LLVMRustAttributeKind::StackProtectStrong:
return Attribute::StackProtectStrong;
case LLVMRustAttributeKind::StackProtect:
return Attribute::StackProtect;
case LLVMRustAttributeKind::NoUndef:
return Attribute::NoUndef;
case LLVMRustAttributeKind::SanitizeMemTag:
return Attribute::SanitizeMemTag;
case LLVMRustAttributeKind::ShadowCallStack:
return Attribute::ShadowCallStack;
case LLVMRustAttributeKind::AllocSize:
return Attribute::AllocSize;
case LLVMRustAttributeKind::AllocatedPointer:
return Attribute::AllocatedPointer;
case LLVMRustAttributeKind::AllocAlign:
return Attribute::AllocAlign;
case LLVMRustAttributeKind::SanitizeSafeStack:
return Attribute::SafeStack;
case LLVMRustAttributeKind::FnRetThunkExtern:
return Attribute::FnRetThunkExtern;
case LLVMRustAttributeKind::Writable:
return Attribute::Writable;
case LLVMRustAttributeKind::DeadOnUnwind:
return Attribute::DeadOnUnwind;
}
report_fatal_error("bad LLVMRustAttributeKind");
}
template <typename T>
static inline void AddAttributes(T *t, unsigned Index, LLVMAttributeRef *Attrs,
size_t AttrsLen) {
AttributeList PAL = t->getAttributes();
auto B = AttrBuilder(t->getContext());
for (LLVMAttributeRef Attr : ArrayRef<LLVMAttributeRef>(Attrs, AttrsLen))
B.addAttribute(unwrap(Attr));
AttributeList PALNew = PAL.addAttributesAtIndex(t->getContext(), Index, B);
t->setAttributes(PALNew);
}
extern "C" void LLVMRustAddFunctionAttributes(LLVMValueRef Fn, unsigned Index,
LLVMAttributeRef *Attrs,
size_t AttrsLen) {
Function *F = unwrap<Function>(Fn);
AddAttributes(F, Index, Attrs, AttrsLen);
}
extern "C" void LLVMRustAddCallSiteAttributes(LLVMValueRef Instr,
unsigned Index,
LLVMAttributeRef *Attrs,
size_t AttrsLen) {
CallBase *Call = unwrap<CallBase>(Instr);
AddAttributes(Call, Index, Attrs, AttrsLen);
}
extern "C" LLVMValueRef LLVMRustGetTerminator(LLVMBasicBlockRef BB) {
Instruction *ret = unwrap(BB)->getTerminator();
return wrap(ret);
}
extern "C" void LLVMRustEraseInstFromParent(LLVMValueRef Instr) {
if (auto I = dyn_cast<Instruction>(unwrap<Value>(Instr))) {
I->eraseFromParent();
}
}
extern "C" LLVMAttributeRef
LLVMRustCreateAttrNoValue(LLVMContextRef C, LLVMRustAttributeKind RustAttr) {
#if LLVM_VERSION_GE(21, 0)
// LLVM 21 replaced the NoCapture attribute with Captures(none).
if (RustAttr == LLVMRustAttributeKind::NoCapture) {
return wrap(Attribute::getWithCaptureInfo(*unwrap(C), CaptureInfo::none()));
}
#endif
return wrap(Attribute::get(*unwrap(C), fromRust(RustAttr)));
}
extern "C" LLVMAttributeRef LLVMRustCreateAlignmentAttr(LLVMContextRef C,
uint64_t Bytes) {
return wrap(Attribute::getWithAlignment(*unwrap(C), llvm::Align(Bytes)));
}
extern "C" LLVMAttributeRef LLVMRustCreateDereferenceableAttr(LLVMContextRef C,
uint64_t Bytes) {
return wrap(Attribute::getWithDereferenceableBytes(*unwrap(C), Bytes));
}
extern "C" LLVMAttributeRef
LLVMRustCreateDereferenceableOrNullAttr(LLVMContextRef C, uint64_t Bytes) {
return wrap(Attribute::getWithDereferenceableOrNullBytes(*unwrap(C), Bytes));
}
extern "C" LLVMAttributeRef LLVMRustCreateByValAttr(LLVMContextRef C,
LLVMTypeRef Ty) {
return wrap(Attribute::getWithByValType(*unwrap(C), unwrap(Ty)));
}
extern "C" LLVMAttributeRef LLVMRustCreateStructRetAttr(LLVMContextRef C,
LLVMTypeRef Ty) {
return wrap(Attribute::getWithStructRetType(*unwrap(C), unwrap(Ty)));
}
extern "C" LLVMAttributeRef LLVMRustCreateElementTypeAttr(LLVMContextRef C,
LLVMTypeRef Ty) {
return wrap(Attribute::get(*unwrap(C), Attribute::ElementType, unwrap(Ty)));
}
extern "C" LLVMAttributeRef LLVMRustCreateUWTableAttr(LLVMContextRef C,
bool Async) {
return wrap(Attribute::getWithUWTableKind(
*unwrap(C), Async ? UWTableKind::Async : UWTableKind::Sync));
}
extern "C" LLVMAttributeRef
LLVMRustCreateAllocSizeAttr(LLVMContextRef C, uint32_t ElementSizeArg) {
return wrap(Attribute::getWithAllocSizeArgs(*unwrap(C), ElementSizeArg,
std::nullopt));
}
extern "C" LLVMAttributeRef
LLVMRustCreateRangeAttribute(LLVMContextRef C, unsigned NumBits,
const uint64_t LowerWords[],
const uint64_t UpperWords[]) {
#if LLVM_VERSION_GE(19, 0)
return LLVMCreateConstantRangeAttribute(C, Attribute::Range, NumBits,
LowerWords, UpperWords);
#else
report_fatal_error("LLVM 19.0 is required for Range Attribute");
#endif
}
// These values **must** match ffi::AllocKindFlags.
// It _happens_ to match the LLVM values of llvm::AllocFnKind,
// but that's happenstance and we do explicit conversions before
// passing them to LLVM.
enum class LLVMRustAllocKindFlags : uint64_t {
Unknown = 0,
Alloc = 1,
Realloc = 1 << 1,
Free = 1 << 2,
Uninitialized = 1 << 3,
Zeroed = 1 << 4,
Aligned = 1 << 5,
};
static LLVMRustAllocKindFlags operator&(LLVMRustAllocKindFlags A,
LLVMRustAllocKindFlags B) {
return static_cast<LLVMRustAllocKindFlags>(static_cast<uint64_t>(A) &
static_cast<uint64_t>(B));
}
static bool isSet(LLVMRustAllocKindFlags F) {
return F != LLVMRustAllocKindFlags::Unknown;
}
static llvm::AllocFnKind allocKindFromRust(LLVMRustAllocKindFlags F) {
llvm::AllocFnKind AFK = llvm::AllocFnKind::Unknown;
if (isSet(F & LLVMRustAllocKindFlags::Alloc)) {
AFK |= llvm::AllocFnKind::Alloc;
}
if (isSet(F & LLVMRustAllocKindFlags::Realloc)) {
AFK |= llvm::AllocFnKind::Realloc;
}
if (isSet(F & LLVMRustAllocKindFlags::Free)) {
AFK |= llvm::AllocFnKind::Free;
}
if (isSet(F & LLVMRustAllocKindFlags::Uninitialized)) {
AFK |= llvm::AllocFnKind::Uninitialized;
}
if (isSet(F & LLVMRustAllocKindFlags::Zeroed)) {
AFK |= llvm::AllocFnKind::Zeroed;
}
if (isSet(F & LLVMRustAllocKindFlags::Aligned)) {
AFK |= llvm::AllocFnKind::Aligned;
}
return AFK;
}
extern "C" LLVMAttributeRef LLVMRustCreateAllocKindAttr(LLVMContextRef C,
uint64_t AllocKindArg) {
return wrap(
Attribute::get(*unwrap(C), Attribute::AllocKind,
static_cast<uint64_t>(allocKindFromRust(
static_cast<LLVMRustAllocKindFlags>(AllocKindArg)))));
}
// Simplified representation of `MemoryEffects` across the FFI boundary.
//
// Each variant corresponds to one of the static factory methods on
// `MemoryEffects`.
enum class LLVMRustMemoryEffects {
None,
ReadOnly,
InaccessibleMemOnly,
};
extern "C" LLVMAttributeRef
LLVMRustCreateMemoryEffectsAttr(LLVMContextRef C,
LLVMRustMemoryEffects Effects) {
switch (Effects) {
case LLVMRustMemoryEffects::None:
return wrap(
Attribute::getWithMemoryEffects(*unwrap(C), MemoryEffects::none()));
case LLVMRustMemoryEffects::ReadOnly:
return wrap(
Attribute::getWithMemoryEffects(*unwrap(C), MemoryEffects::readOnly()));
case LLVMRustMemoryEffects::InaccessibleMemOnly:
return wrap(Attribute::getWithMemoryEffects(
*unwrap(C), MemoryEffects::inaccessibleMemOnly()));
default:
report_fatal_error("bad MemoryEffects.");
}
}
// Enable all fast-math flags, including those which will cause floating-point
// operations to return poison for some well-defined inputs. This function can
// only be used to build unsafe Rust intrinsics. That unsafety does permit
// additional optimizations, but at the time of writing, their value is not
// well-understood relative to those enabled by LLVMRustSetAlgebraicMath.
//
// https://llvm.org/docs/LangRef.html#fast-math-flags
extern "C" void LLVMRustSetFastMath(LLVMValueRef V) {
if (auto I = dyn_cast<Instruction>(unwrap<Value>(V))) {
I->setFast(true);
}
}
// Enable fast-math flags which permit algebraic transformations that are not
// allowed by IEEE floating point. For example: a + (b + c) = (a + b) + c and a
// / b = a * (1 / b) Note that this does NOT enable any flags which can cause a
// floating-point operation on well-defined inputs to return poison, and
// therefore this function can be used to build safe Rust intrinsics (such as
// fadd_algebraic).
//
// https://llvm.org/docs/LangRef.html#fast-math-flags
extern "C" void LLVMRustSetAlgebraicMath(LLVMValueRef V) {
if (auto I = dyn_cast<Instruction>(unwrap<Value>(V))) {
I->setHasAllowReassoc(true);
I->setHasAllowContract(true);
I->setHasAllowReciprocal(true);
I->setHasNoSignedZeros(true);
}
}
// Enable the reassoc fast-math flag, allowing transformations that pretend
// floating-point addition and multiplication are associative.
//
// Note that this does NOT enable any flags which can cause a floating-point
// operation on well-defined inputs to return poison, and therefore this
// function can be used to build safe Rust intrinsics (such as fadd_algebraic).
//
// https://llvm.org/docs/LangRef.html#fast-math-flags
extern "C" void LLVMRustSetAllowReassoc(LLVMValueRef V) {
if (auto I = dyn_cast<Instruction>(unwrap<Value>(V))) {
I->setHasAllowReassoc(true);
}
}
extern "C" LLVMValueRef
LLVMRustBuildAtomicLoad(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Source,
const char *Name, LLVMAtomicOrdering Order) {
Value *Ptr = unwrap(Source);
LoadInst *LI = unwrap(B)->CreateLoad(unwrap(Ty), Ptr, Name);
LI->setAtomic(fromRust(Order));
return wrap(LI);
}
extern "C" LLVMValueRef LLVMRustBuildAtomicStore(LLVMBuilderRef B,
LLVMValueRef V,
LLVMValueRef Target,
LLVMAtomicOrdering Order) {
StoreInst *SI = unwrap(B)->CreateStore(unwrap(V), unwrap(Target));
SI->setAtomic(fromRust(Order));
return wrap(SI);
}
enum class LLVMRustAsmDialect {
Att,
Intel,
};
static InlineAsm::AsmDialect fromRust(LLVMRustAsmDialect Dialect) {
switch (Dialect) {
case LLVMRustAsmDialect::Att:
return InlineAsm::AD_ATT;
case LLVMRustAsmDialect::Intel:
return InlineAsm::AD_Intel;
default:
report_fatal_error("bad AsmDialect.");
}
}
extern "C" LLVMValueRef
LLVMRustInlineAsm(LLVMTypeRef Ty, char *AsmString, size_t AsmStringLen,
char *Constraints, size_t ConstraintsLen,
LLVMBool HasSideEffects, LLVMBool IsAlignStack,
LLVMRustAsmDialect Dialect, LLVMBool CanThrow) {
return wrap(InlineAsm::get(
unwrap<FunctionType>(Ty), StringRef(AsmString, AsmStringLen),
StringRef(Constraints, ConstraintsLen), HasSideEffects, IsAlignStack,
fromRust(Dialect), CanThrow));
}
extern "C" bool LLVMRustInlineAsmVerify(LLVMTypeRef Ty, char *Constraints,
size_t ConstraintsLen) {
// llvm::Error converts to true if it is an error.
return !llvm::errorToBool(InlineAsm::verify(
unwrap<FunctionType>(Ty), StringRef(Constraints, ConstraintsLen)));
}
template <typename DIT> DIT *unwrapDIPtr(LLVMMetadataRef Ref) {
return (DIT *)(Ref ? unwrap<MDNode>(Ref) : nullptr);
}
#define DIDescriptor DIScope
#define DIArray DINodeArray
#define unwrapDI unwrapDIPtr
// Statically assert that `LLVMDIFlags` (C) and `DIFlags` (C++) have the same
// layout, at least for the flags we know about. This isn't guaranteed, but is
// likely to remain true, and as long as it is true it makes conversions easy.
#define ASSERT_DIFLAG_VALUE(FLAG, VALUE) \
static_assert((LLVMDI##FLAG == (VALUE)) && (DINode::DIFlags::FLAG == (VALUE)))
ASSERT_DIFLAG_VALUE(FlagZero, 0);
ASSERT_DIFLAG_VALUE(FlagPrivate, 1);
ASSERT_DIFLAG_VALUE(FlagProtected, 2);
ASSERT_DIFLAG_VALUE(FlagPublic, 3);
// Bit (1 << 1) is part of the private/protected/public values above.
ASSERT_DIFLAG_VALUE(FlagFwdDecl, 1 << 2);
ASSERT_DIFLAG_VALUE(FlagAppleBlock, 1 << 3);
ASSERT_DIFLAG_VALUE(FlagReservedBit4, 1 << 4);
ASSERT_DIFLAG_VALUE(FlagVirtual, 1 << 5);
ASSERT_DIFLAG_VALUE(FlagArtificial, 1 << 6);
ASSERT_DIFLAG_VALUE(FlagExplicit, 1 << 7);
ASSERT_DIFLAG_VALUE(FlagPrototyped, 1 << 8);
ASSERT_DIFLAG_VALUE(FlagObjcClassComplete, 1 << 9);
ASSERT_DIFLAG_VALUE(FlagObjectPointer, 1 << 10);
ASSERT_DIFLAG_VALUE(FlagVector, 1 << 11);
ASSERT_DIFLAG_VALUE(FlagStaticMember, 1 << 12);
ASSERT_DIFLAG_VALUE(FlagLValueReference, 1 << 13);
ASSERT_DIFLAG_VALUE(FlagRValueReference, 1 << 14);
// Bit (1 << 15) has been recycled, but the C API value hasn't been renamed.
static_assert((LLVMDIFlagReserved == (1 << 15)) &&
(DINode::DIFlags::FlagExportSymbols == (1 << 15)));
ASSERT_DIFLAG_VALUE(FlagSingleInheritance, 1 << 16);
ASSERT_DIFLAG_VALUE(FlagMultipleInheritance, 2 << 16);
ASSERT_DIFLAG_VALUE(FlagVirtualInheritance, 3 << 16);
// Bit (1 << 17) is part of the inheritance values above.
ASSERT_DIFLAG_VALUE(FlagIntroducedVirtual, 1 << 18);
ASSERT_DIFLAG_VALUE(FlagBitField, 1 << 19);
ASSERT_DIFLAG_VALUE(FlagNoReturn, 1 << 20);
// Bit (1 << 21) is unused, but was `LLVMDIFlagMainSubprogram`.
ASSERT_DIFLAG_VALUE(FlagTypePassByValue, 1 << 22);
ASSERT_DIFLAG_VALUE(FlagTypePassByReference, 1 << 23);
ASSERT_DIFLAG_VALUE(FlagEnumClass, 1 << 24);
ASSERT_DIFLAG_VALUE(FlagThunk, 1 << 25);
ASSERT_DIFLAG_VALUE(FlagNonTrivial, 1 << 26);
ASSERT_DIFLAG_VALUE(FlagBigEndian, 1 << 27);
ASSERT_DIFLAG_VALUE(FlagLittleEndian, 1 << 28);
ASSERT_DIFLAG_VALUE(FlagIndirectVirtualBase, (1 << 2) | (1 << 5));
#undef ASSERT_DIFLAG_VALUE
// There are two potential ways to convert `LLVMDIFlags` to `DIFlags`:
// - Check and copy every individual bit/subvalue from input to output.
// - Statically assert that both have the same layout, and cast.
// As long as the static assertions succeed, a cast is easier and faster.
// In the (hopefully) unlikely event that the assertions do fail someday, and
// LLVM doesn't expose its own conversion function, we'll have to switch over
// to copying each bit/subvalue.
static DINode::DIFlags fromRust(LLVMDIFlags Flags) {
// Check that all set bits are covered by the static assertions above.
const unsigned UNKNOWN_BITS = (1 << 31) | (1 << 30) | (1 << 29) | (1 << 21);
if (Flags & UNKNOWN_BITS) {
report_fatal_error("bad LLVMDIFlags");
}
// As long as the static assertions are satisfied and no unknown bits are
// present, we can convert from `LLVMDIFlags` to `DIFlags` with a cast.
return static_cast<DINode::DIFlags>(Flags);
}
// These values **must** match debuginfo::DISPFlags! They also *happen*
// to match LLVM, but that isn't required as we do giant sets of
// matching below. The value shouldn't be directly passed to LLVM.
enum class LLVMRustDISPFlags : uint32_t {
SPFlagZero = 0,
SPFlagVirtual = 1,
SPFlagPureVirtual = 2,
SPFlagLocalToUnit = (1 << 2),
SPFlagDefinition = (1 << 3),
SPFlagOptimized = (1 << 4),
SPFlagMainSubprogram = (1 << 5),
// Do not add values that are not supported by the minimum LLVM
// version we support! see llvm/include/llvm/IR/DebugInfoFlags.def
// (In LLVM < 8, createFunction supported these as separate bool arguments.)
};
inline LLVMRustDISPFlags operator&(LLVMRustDISPFlags A, LLVMRustDISPFlags B) {
return static_cast<LLVMRustDISPFlags>(static_cast<uint32_t>(A) &
static_cast<uint32_t>(B));
}
inline LLVMRustDISPFlags operator|(LLVMRustDISPFlags A, LLVMRustDISPFlags B) {
return static_cast<LLVMRustDISPFlags>(static_cast<uint32_t>(A) |
static_cast<uint32_t>(B));
}
inline LLVMRustDISPFlags &operator|=(LLVMRustDISPFlags &A,
LLVMRustDISPFlags B) {
return A = A | B;
}
inline bool isSet(LLVMRustDISPFlags F) {
return F != LLVMRustDISPFlags::SPFlagZero;
}
inline LLVMRustDISPFlags virtuality(LLVMRustDISPFlags F) {
return static_cast<LLVMRustDISPFlags>(static_cast<uint32_t>(F) & 0x3);
}
static DISubprogram::DISPFlags fromRust(LLVMRustDISPFlags SPFlags) {
DISubprogram::DISPFlags Result = DISubprogram::DISPFlags::SPFlagZero;
switch (virtuality(SPFlags)) {
case LLVMRustDISPFlags::SPFlagVirtual:
Result |= DISubprogram::DISPFlags::SPFlagVirtual;
break;
case LLVMRustDISPFlags::SPFlagPureVirtual:
Result |= DISubprogram::DISPFlags::SPFlagPureVirtual;
break;
default:
// The rest are handled below
break;
}
if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagLocalToUnit)) {
Result |= DISubprogram::DISPFlags::SPFlagLocalToUnit;
}
if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagDefinition)) {
Result |= DISubprogram::DISPFlags::SPFlagDefinition;
}
if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagOptimized)) {
Result |= DISubprogram::DISPFlags::SPFlagOptimized;
}
if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagMainSubprogram)) {
Result |= DISubprogram::DISPFlags::SPFlagMainSubprogram;
}
return Result;
}
enum class LLVMRustDebugEmissionKind {
NoDebug,
FullDebug,
LineTablesOnly,
DebugDirectivesOnly,
};
static DICompileUnit::DebugEmissionKind
fromRust(LLVMRustDebugEmissionKind Kind) {
switch (Kind) {
case LLVMRustDebugEmissionKind::NoDebug:
return DICompileUnit::DebugEmissionKind::NoDebug;
case LLVMRustDebugEmissionKind::FullDebug:
return DICompileUnit::DebugEmissionKind::FullDebug;
case LLVMRustDebugEmissionKind::LineTablesOnly:
return DICompileUnit::DebugEmissionKind::LineTablesOnly;
case LLVMRustDebugEmissionKind::DebugDirectivesOnly:
return DICompileUnit::DebugEmissionKind::DebugDirectivesOnly;
default:
report_fatal_error("bad DebugEmissionKind.");
}
}
enum class LLVMRustDebugNameTableKind {
Default,
GNU,
None,
};
static DICompileUnit::DebugNameTableKind
fromRust(LLVMRustDebugNameTableKind Kind) {
switch (Kind) {
case LLVMRustDebugNameTableKind::Default:
return DICompileUnit::DebugNameTableKind::Default;
case LLVMRustDebugNameTableKind::GNU:
return DICompileUnit::DebugNameTableKind::GNU;
case LLVMRustDebugNameTableKind::None:
return DICompileUnit::DebugNameTableKind::None;
default:
report_fatal_error("bad DebugNameTableKind.");
}
}
enum class LLVMRustChecksumKind {
None,
MD5,
SHA1,
SHA256,
};
static std::optional<DIFile::ChecksumKind> fromRust(LLVMRustChecksumKind Kind) {
switch (Kind) {
case LLVMRustChecksumKind::None:
return std::nullopt;
case LLVMRustChecksumKind::MD5:
return DIFile::ChecksumKind::CSK_MD5;
case LLVMRustChecksumKind::SHA1:
return DIFile::ChecksumKind::CSK_SHA1;
case LLVMRustChecksumKind::SHA256:
return DIFile::ChecksumKind::CSK_SHA256;
default:
report_fatal_error("bad ChecksumKind.");
}
}
extern "C" uint32_t LLVMRustDebugMetadataVersion() {
return DEBUG_METADATA_VERSION;
}
extern "C" uint32_t LLVMRustVersionPatch() { return LLVM_VERSION_PATCH; }
extern "C" uint32_t LLVMRustVersionMinor() { return LLVM_VERSION_MINOR; }
extern "C" uint32_t LLVMRustVersionMajor() { return LLVM_VERSION_MAJOR; }
// FFI equivalent of LLVM's `llvm::Module::ModFlagBehavior`.
// Must match the layout of
// `rustc_codegen_llvm::llvm::ffi::ModuleFlagMergeBehavior`.
//
// There is a stable LLVM-C version of this enum (`LLVMModuleFlagBehavior`),
// but as of LLVM 19 it does not support all of the enum values in the unstable
// C++ API.
enum class LLVMRustModuleFlagMergeBehavior {
Error = 1,
Warning = 2,
Require = 3,
Override = 4,
Append = 5,
AppendUnique = 6,
Max = 7,
Min = 8,
};
static Module::ModFlagBehavior
fromRust(LLVMRustModuleFlagMergeBehavior Behavior) {
switch (Behavior) {
case LLVMRustModuleFlagMergeBehavior::Error:
return Module::ModFlagBehavior::Error;
case LLVMRustModuleFlagMergeBehavior::Warning:
return Module::ModFlagBehavior::Warning;
case LLVMRustModuleFlagMergeBehavior::Require:
return Module::ModFlagBehavior::Require;
case LLVMRustModuleFlagMergeBehavior::Override:
return Module::ModFlagBehavior::Override;
case LLVMRustModuleFlagMergeBehavior::Append:
return Module::ModFlagBehavior::Append;
case LLVMRustModuleFlagMergeBehavior::AppendUnique:
return Module::ModFlagBehavior::AppendUnique;
case LLVMRustModuleFlagMergeBehavior::Max:
return Module::ModFlagBehavior::Max;
case LLVMRustModuleFlagMergeBehavior::Min:
return Module::ModFlagBehavior::Min;
}
report_fatal_error("bad LLVMRustModuleFlagMergeBehavior");
}
extern "C" void
LLVMRustAddModuleFlagU32(LLVMModuleRef M,
LLVMRustModuleFlagMergeBehavior MergeBehavior,
const char *Name, size_t NameLen, uint32_t Value) {
unwrap(M)->addModuleFlag(fromRust(MergeBehavior), StringRef(Name, NameLen),
Value);
}
extern "C" void LLVMRustAddModuleFlagString(
LLVMModuleRef M, LLVMRustModuleFlagMergeBehavior MergeBehavior,
const char *Name, size_t NameLen, const char *Value, size_t ValueLen) {
unwrap(M)->addModuleFlag(
fromRust(MergeBehavior), StringRef(Name, NameLen),
MDString::get(unwrap(M)->getContext(), StringRef(Value, ValueLen)));
}
extern "C" LLVMValueRef LLVMRustGetLastInstruction(LLVMBasicBlockRef BB) {
auto Point = unwrap(BB)->rbegin();
if (Point != unwrap(BB)->rend())
return wrap(&*Point);
return nullptr;
}
extern "C" void LLVMRustEraseInstUntilInclusive(LLVMBasicBlockRef bb,
LLVMValueRef I) {
auto &BB = *unwrap(bb);
auto &Inst = *unwrap<Instruction>(I);
auto It = BB.begin();
while (&*It != &Inst)
++It;
// Make sure we found the Instruction.
assert(It != BB.end());
// Delete in rev order to ensure no dangling references.
while (It != BB.begin()) {
auto Prev = std::prev(It);
It->eraseFromParent();
It = Prev;
}
It->eraseFromParent();
}
extern "C" bool LLVMRustHasMetadata(LLVMValueRef inst, unsigned kindID) {
if (auto *I = dyn_cast<Instruction>(unwrap<Value>(inst))) {
return I->hasMetadata(kindID);
}
return false;
}
extern "C" LLVMMetadataRef LLVMRustDIGetInstMetadata(LLVMValueRef x) {
if (auto *I = dyn_cast<Instruction>(unwrap<Value>(x))) {
auto *MD = I->getDebugLoc().getAsMDNode();
return wrap(MD);
}
return nullptr;
}
extern "C" void LLVMRustGlobalAddMetadata(LLVMValueRef Global, unsigned Kind,
LLVMMetadataRef MD) {
unwrap<GlobalObject>(Global)->addMetadata(Kind, *unwrap<MDNode>(MD));
}
extern "C" LLVMDIBuilderRef LLVMRustDIBuilderCreate(LLVMModuleRef M) {
return wrap(new DIBuilder(*unwrap(M)));
}
extern "C" void LLVMRustDIBuilderDispose(LLVMDIBuilderRef Builder) {
delete unwrap(Builder);
}
extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateCompileUnit(
LLVMDIBuilderRef Builder, unsigned Lang, LLVMMetadataRef FileRef,
const char *Producer, size_t ProducerLen, bool isOptimized,
const char *Flags, unsigned RuntimeVer, const char *SplitName,
size_t SplitNameLen, LLVMRustDebugEmissionKind Kind, uint64_t DWOId,
bool SplitDebugInlining, LLVMRustDebugNameTableKind TableKind) {
auto *File = unwrapDI<DIFile>(FileRef);
return wrap(unwrap(Builder)->createCompileUnit(
Lang, File, StringRef(Producer, ProducerLen), isOptimized, Flags,
RuntimeVer, StringRef(SplitName, SplitNameLen), fromRust(Kind), DWOId,
SplitDebugInlining, false, fromRust(TableKind)));
}
extern "C" LLVMMetadataRef
LLVMRustDIBuilderCreateFile(LLVMDIBuilderRef Builder, const char *Filename,
size_t FilenameLen, const char *Directory,
size_t DirectoryLen, LLVMRustChecksumKind CSKind,