softonik/tinygo
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transform: remove switched func lowering

Просмотр исходного кода 
The switched func lowering was mainly necessary for coroutines.
With coroutines removed, this is no longer necessary.
Этот коммит содержится в:
Nia Waldvogel 2021-12-31 13:51:47 -05:00 • коммит произвёл Nia
родитель ea2a6b70b2
коммит 0c2fefa09b
14 изменённых файлов: 57 добавлений и 617 удалений
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1
builder/build.go
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@ -153,7 +153,6 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
SizeLevel: sizeLevel,
Scheduler: config.Scheduler(),
FuncImplementation: config.FuncImplementation(),
AutomaticStackSize: config.AutomaticStackSize(),
DefaultStackSize: config.Target.DefaultStackSize,
NeedsStackObjects: config.NeedsStackObjects(),

22
compileopts/config.go
Просмотреть файл

@ -159,28 +159,6 @@ func (c *Config) OptLevels() (optLevel, sizeLevel int, inlinerThreshold uint) {
}
}
// FuncImplementation picks an appropriate func value implementation for the
// target.
func (c *Config) FuncImplementation() string {
switch c.Scheduler() {
case "tasks", "asyncify":
// A func value is implemented as a pair of pointers:
// {context, function pointer}
// where the context may be a pointer to a heap-allocated struct
// containing the free variables, or it may be undef if the function
// being pointed to doesn't need a context. The function pointer is a
// regular function pointer.
return "doubleword"
case "none":
// As "doubleword", but with the function pointer replaced by a unique
// ID per function signature. Function values are called by using a
// switch statement and choosing which function to call.
return "switch"
default:
panic("unknown scheduler type")
}
}
// PanicStrategy returns the panic strategy selected for this target. Valid
// values are "print" (print the panic value, then exit) or "trap" (issue a trap
// instruction).

1
compiler/compiler.go
Просмотреть файл

@ -47,7 +47,6 @@ type Config struct {
// Various compiler options that determine how code is generated.
Scheduler string
FuncImplementation string
AutomaticStackSize bool
DefaultStackSize uint64
NeedsStackObjects bool

3
compiler/compiler_test.go
Просмотреть файл

@ -55,7 +55,7 @@ func TestCompiler(t *testing.T) {
{"string.go", "", ""},
{"float.go", "", ""},
{"interface.go", "", ""},
{"func.go", "", "none"},
{"func.go", "", ""},
{"pragma.go", "", ""},
{"goroutine.go", "wasm", "asyncify"},
{"goroutine.go", "cortex-m-qemu", "tasks"},
@ -105,7 +105,6 @@ func TestCompiler(t *testing.T) {
CodeModel: config.CodeModel(),
RelocationModel: config.RelocationModel(),
Scheduler: config.Scheduler(),
FuncImplementation: config.FuncImplementation(),
AutomaticStackSize: config.AutomaticStackSize(),
DefaultStackSize: config.Target.DefaultStackSize,
NeedsStackObjects: config.NeedsStackObjects(),

47
compiler/func.go
Просмотреть файл

@ -19,29 +19,8 @@ func (b *builder) createFuncValue(funcPtr, context llvm.Value, sig *types.Signat
// createFuncValue creates a function value from a raw function pointer with no
// context.
func (c *compilerContext) createFuncValue(builder llvm.Builder, funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
var funcValueScalar llvm.Value
switch c.FuncImplementation {
case "doubleword":
// Closure is: {context, function pointer}
funcValueScalar = llvm.ConstBitCast(funcPtr, c.rawVoidFuncType)
case "switch":
funcValueWithSignatureGlobalName := funcPtr.Name() + "$withSignature"
funcValueWithSignatureGlobal := c.mod.NamedGlobal(funcValueWithSignatureGlobalName)
if funcValueWithSignatureGlobal.IsNil() {
funcValueWithSignatureType := c.getLLVMRuntimeType("funcValueWithSignature")
funcValueWithSignature := llvm.ConstNamedStruct(funcValueWithSignatureType, []llvm.Value{
llvm.ConstPtrToInt(funcPtr, c.uintptrType),
c.getFuncSignatureID(sig),
})
funcValueWithSignatureGlobal = llvm.AddGlobal(c.mod, funcValueWithSignatureType, funcValueWithSignatureGlobalName)
funcValueWithSignatureGlobal.SetInitializer(funcValueWithSignature)
funcValueWithSignatureGlobal.SetGlobalConstant(true)
funcValueWithSignatureGlobal.SetLinkage(llvm.LinkOnceODRLinkage)
}
funcValueScalar = llvm.ConstPtrToInt(funcValueWithSignatureGlobal, c.uintptrType)
default:
panic("unimplemented func value variant")
}
funcValueScalar := llvm.ConstBitCast(funcPtr, c.rawVoidFuncType)
funcValueType := c.getFuncType(sig)
funcValue := llvm.Undef(funcValueType)
funcValue = builder.CreateInsertValue(funcValue, context, 0, "")
@ -78,8 +57,6 @@ func (b *builder) extractFuncContext(funcValue llvm.Value) llvm.Value {
// value. This may be an expensive operation.
func (b *builder) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (funcPtr, context llvm.Value) {
context = b.CreateExtractValue(funcValue, 0, "")
switch b.FuncImplementation {
case "doubleword":
bitcast := b.CreateExtractValue(funcValue, 1, "")
if !bitcast.IsAConstantExpr().IsNil() && bitcast.Opcode() == llvm.BitCast {
funcPtr = bitcast.Operand(0)
@ -87,34 +64,12 @@ func (b *builder) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (f
}
llvmSig := b.getRawFuncType(sig)
funcPtr = b.CreateBitCast(bitcast, llvmSig, "")
case "switch":
if !funcValue.IsAConstant().IsNil() {
// If this is a constant func value, the underlying function is
// known and can be returned directly.
funcValueWithSignatureGlobal := llvm.ConstExtractValue(funcValue, []uint32{1}).Operand(0)
funcPtr = llvm.ConstExtractValue(funcValueWithSignatureGlobal.Initializer(), []uint32{0}).Operand(0)
return
}
llvmSig := b.getRawFuncType(sig)
sigGlobal := b.getFuncSignatureID(sig)
funcPtr = b.createRuntimeCall("getFuncPtr", []llvm.Value{funcValue, sigGlobal}, "")
funcPtr = b.CreateIntToPtr(funcPtr, llvmSig, "")
default:
panic("unimplemented func value variant")
}
return
}
// getFuncType returns the type of a func value given a signature.
func (c *compilerContext) getFuncType(typ *types.Signature) llvm.Type {
switch c.FuncImplementation {
case "doubleword":
return c.ctx.StructType([]llvm.Type{c.i8ptrType, c.rawVoidFuncType}, false)
case "switch":
return c.getLLVMRuntimeType("funcValue")
default:
panic("unimplemented func value variant")
}
}
// getRawFuncType returns a LLVM function pointer type for a given signature.

55
compiler/testdata/func-none.ll предоставленный
Просмотреть файл

@ -1,55 +0,0 @@
; ModuleID = 'func.go'
source_filename = "func.go"
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128-ni:1:10:20"
target triple = "wasm32-unknown-wasi"
%runtime.funcValueWithSignature = type { i32, i8* }
@"reflect/types.funcid:func:{basic:int}{}" = external constant i8
@"main.someFunc$withSignature" = linkonce_odr constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @main.someFunc to i32), i8* @"reflect/types.funcid:func:{basic:int}{}" }
declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*, i8*)
declare void @runtime.trackPointer(i8* nocapture readonly, i8*, i8*)
; Function Attrs: nounwind
define hidden void @main.init(i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
ret void
}
; Function Attrs: nounwind
define hidden void @main.foo(i8* %callback.context, i32 %callback.funcptr, i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
%0 = call i32 @runtime.getFuncPtr(i8* %callback.context, i32 %callback.funcptr, i8* nonnull @"reflect/types.funcid:func:{basic:int}{}", i8* undef, i8* null) #0
%1 = icmp eq i32 %0, 0
br i1 %1, label %fpcall.throw, label %fpcall.next
fpcall.throw: ; preds = %entry
call void @runtime.nilPanic(i8* undef, i8* null) #0
unreachable
fpcall.next: ; preds = %entry
%2 = inttoptr i32 %0 to void (i32, i8*, i8*)*
call void %2(i32 3, i8* %callback.context, i8* undef) #0
ret void
}
declare i32 @runtime.getFuncPtr(i8*, i32, i8* dereferenceable_or_null(1), i8*, i8*)
declare void @runtime.nilPanic(i8*, i8*)
; Function Attrs: nounwind
define hidden void @main.bar(i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
call void @main.foo(i8* undef, i32 ptrtoint (%runtime.funcValueWithSignature* @"main.someFunc$withSignature" to i32), i8* undef, i8* undef)
ret void
}
; Function Attrs: nounwind
define hidden void @main.someFunc(i32 %arg0, i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
ret void
}
attributes #0 = { nounwind }

47
compiler/testdata/func.ll предоставленный Обычный файл
Просмотреть файл

@ -0,0 +1,47 @@
; ModuleID = 'func.go'
source_filename = "func.go"
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128-ni:1:10:20"
target triple = "wasm32-unknown-wasi"
declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*, i8*)
declare void @runtime.trackPointer(i8* nocapture readonly, i8*, i8*)
; Function Attrs: nounwind
define hidden void @main.init(i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
ret void
}
; Function Attrs: nounwind
define hidden void @main.foo(i8* %callback.context, void ()* %callback.funcptr, i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
%0 = icmp eq void ()* %callback.funcptr, null
br i1 %0, label %fpcall.throw, label %fpcall.next
fpcall.throw: ; preds = %entry
call void @runtime.nilPanic(i8* undef, i8* null) #0
unreachable
fpcall.next: ; preds = %entry
%1 = bitcast void ()* %callback.funcptr to void (i32, i8*, i8*)*
call void %1(i32 3, i8* %callback.context, i8* undef) #0
ret void
}
declare void @runtime.nilPanic(i8*, i8*)
; Function Attrs: nounwind
define hidden void @main.bar(i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
call void @main.foo(i8* undef, void ()* bitcast (void (i32, i8*, i8*)* @main.someFunc to void ()*), i8* undef, i8* undef)
ret void
}
; Function Attrs: nounwind
define hidden void @main.someFunc(i32 %arg0, i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
ret void
}
attributes #0 = { nounwind }

5
compiler/testdata/gc.go предоставленный
Просмотреть файл

@ -61,11 +61,6 @@ func newStruct() {
}
func newFuncValue() *func() {
// On some platforms that use runtime.funcValue ("switch" style) function
// values, a func value is allocated as having two pointer words while the
// struct looks like {unsafe.Pointer; uintptr}. This is so that the interp
// package won't get confused, see getPointerBitmap in compiler/llvm.go for
// details.
return new(func())
}

285
transform/func-lowering.go
Просмотреть файл

@ -1,285 +0,0 @@
package transform
// This file lowers func values into their final form. This is necessary for
// funcValueSwitch, which needs full program analysis.
import (
"sort"
"strconv"
"strings"
"github.com/tinygo-org/tinygo/compiler/llvmutil"
"tinygo.org/x/go-llvm"
)
// funcSignatureInfo keeps information about a single signature and its uses.
type funcSignatureInfo struct {
sig llvm.Value // *uint8 to identify the signature
funcValueWithSignatures []llvm.Value // slice of runtime.funcValueWithSignature
}
// funcWithUses keeps information about a single function used as func value and
// the assigned function ID. More commonly used functions are assigned a lower
// ID.
type funcWithUses struct {
funcPtr llvm.Value
useCount int // how often this function is used in a func value
id int // assigned ID
}
// Slice to sort functions by their use counts, or else their name if they're
// used equally often.
type funcWithUsesList []*funcWithUses
func (l funcWithUsesList) Len() int { return len(l) }
func (l funcWithUsesList) Less(i, j int) bool {
if l[i].useCount != l[j].useCount {
// return the reverse: we want the highest use counts sorted first
return l[i].useCount > l[j].useCount
}
iName := l[i].funcPtr.Name()
jName := l[j].funcPtr.Name()
return iName < jName
}
func (l funcWithUsesList) Swap(i, j int) {
l[i], l[j] = l[j], l[i]
}
// LowerFuncValues lowers the runtime.funcValueWithSignature type and
// runtime.getFuncPtr function to their final form.
func LowerFuncValues(mod llvm.Module) {
ctx := mod.Context()
builder := ctx.NewBuilder()
uintptrType := ctx.IntType(llvm.NewTargetData(mod.DataLayout()).PointerSize() * 8)
// Find all func values used in the program with their signatures.
signatures := map[string]*funcSignatureInfo{}
for global := mod.FirstGlobal(); !global.IsNil(); global = llvm.NextGlobal(global) {
var sig, funcVal llvm.Value
switch {
case strings.HasSuffix(global.Name(), "$withSignature"):
sig = llvm.ConstExtractValue(global.Initializer(), []uint32{1})
funcVal = global
case strings.HasPrefix(global.Name(), "reflect/types.funcid:func:{"):
sig = global
default:
continue
}
name := sig.Name()
var funcValueWithSignatures []llvm.Value
if funcVal.IsNil() {
funcValueWithSignatures = []llvm.Value{}
} else {
funcValueWithSignatures = []llvm.Value{funcVal}
}
if info, ok := signatures[name]; ok {
info.funcValueWithSignatures = append(info.funcValueWithSignatures, funcValueWithSignatures...)
} else {
signatures[name] = &funcSignatureInfo{
sig: sig,
funcValueWithSignatures: funcValueWithSignatures,
}
}
}
// Sort the signatures, for deterministic execution.
names := make([]string, 0, len(signatures))
for name := range signatures {
names = append(names, name)
}
sort.Strings(names)
for _, name := range names {
info := signatures[name]
functions := make(funcWithUsesList, len(info.funcValueWithSignatures))
for i, use := range info.funcValueWithSignatures {
var useCount int
for _, use2 := range getUses(use) {
useCount += len(getUses(use2))
}
functions[i] = &funcWithUses{
funcPtr: llvm.ConstExtractValue(use.Initializer(), []uint32{0}).Operand(0),
useCount: useCount,
}
}
sort.Sort(functions)
for i, fn := range functions {
fn.id = i + 1
for _, ptrtoint := range getUses(fn.funcPtr) {
if ptrtoint.IsAConstantExpr().IsNil() || ptrtoint.Opcode() != llvm.PtrToInt {
continue
}
for _, funcValueWithSignatureConstant := range getUses(ptrtoint) {
if !funcValueWithSignatureConstant.IsACallInst().IsNil() && funcValueWithSignatureConstant.CalledValue().Name() == "runtime.makeGoroutine" {
// makeGoroutine calls are handled seperately
continue
}
for _, funcValueWithSignatureGlobal := range getUses(funcValueWithSignatureConstant) {
id := llvm.ConstInt(uintptrType, uint64(fn.id), false)
for _, use := range getUses(funcValueWithSignatureGlobal) {
// Try to replace uses directly: most will be
// ptrtoint instructions.
if !use.IsAConstantExpr().IsNil() && use.Opcode() == llvm.PtrToInt {
use.ReplaceAllUsesWith(id)
}
}
// Remaining uses can be replaced using a ptrtoint.
// In my quick testing, this doesn't really happen in
// practice.
funcValueWithSignatureGlobal.ReplaceAllUsesWith(llvm.ConstIntToPtr(id, funcValueWithSignatureGlobal.Type()))
}
}
}
}
for _, getFuncPtrCall := range getUses(info.sig) {
if getFuncPtrCall.IsACallInst().IsNil() {
continue
}
if getFuncPtrCall.CalledValue().Name() != "runtime.getFuncPtr" {
panic("expected all call uses to be runtime.getFuncPtr")
}
funcID := getFuncPtrCall.Operand(1)
// There are functions used in a func value that
// implement this signature.
// What we'll do is transform the following:
// rawPtr := runtime.getFuncPtr(func.ptr)
// if rawPtr == nil {
// runtime.nilPanic()
// }
// result := rawPtr(...args, func.context)
// into this:
// if false {
// runtime.nilPanic()
// }
// var result // Phi
// switch fn.id {
// case 0:
// runtime.nilPanic()
// case 1:
// result = call first implementation...
// case 2:
// result = call second implementation...
// default:
// unreachable
// }
// Remove some casts, checks, and the old call which we're going
// to replace.
for _, callIntPtr := range getUses(getFuncPtrCall) {
if !callIntPtr.IsACallInst().IsNil() && callIntPtr.CalledValue().Name() == "internal/task.start" {
// Special case for goroutine starts.
addFuncLoweringSwitch(mod, builder, funcID, callIntPtr, func(funcPtr llvm.Value, params []llvm.Value) llvm.Value {
i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
calleeValue := builder.CreatePtrToInt(funcPtr, uintptrType, "")
start := mod.NamedFunction("internal/task.start")
builder.CreateCall(start, []llvm.Value{calleeValue, callIntPtr.Operand(1), llvm.Undef(uintptrType), llvm.Undef(i8ptrType), llvm.ConstNull(i8ptrType)}, "")
return llvm.Value{} // void so no return value
}, functions)
callIntPtr.EraseFromParentAsInstruction()
continue
}
if callIntPtr.IsAIntToPtrInst().IsNil() {
panic("expected inttoptr")
}
for _, ptrUse := range getUses(callIntPtr) {
if !ptrUse.IsAICmpInst().IsNil() {
ptrUse.ReplaceAllUsesWith(llvm.ConstInt(ctx.Int1Type(), 0, false))
} else if !ptrUse.IsACallInst().IsNil() && ptrUse.CalledValue() == callIntPtr {
addFuncLoweringSwitch(mod, builder, funcID, ptrUse, func(funcPtr llvm.Value, params []llvm.Value) llvm.Value {
return builder.CreateCall(funcPtr, params, "")
}, functions)
} else {
panic("unexpected getFuncPtrCall")
}
ptrUse.EraseFromParentAsInstruction()
}
callIntPtr.EraseFromParentAsInstruction()
}
getFuncPtrCall.EraseFromParentAsInstruction()
}
// Clean up all globals used before func lowering.
for _, obj := range info.funcValueWithSignatures {
obj.EraseFromParentAsGlobal()
}
info.sig.EraseFromParentAsGlobal()
}
}
// addFuncLoweringSwitch creates a new switch on a function ID and inserts calls
// to the newly created direct calls. The funcID is the number to switch on,
// call is the call instruction to replace, and createCall is the callback that
// actually creates the new call. By changing createCall to something other than
// builder.CreateCall, instead of calling a function it can start a new
// goroutine for example.
func addFuncLoweringSwitch(mod llvm.Module, builder llvm.Builder, funcID, call llvm.Value, createCall func(funcPtr llvm.Value, params []llvm.Value) llvm.Value, functions funcWithUsesList) {
ctx := mod.Context()
uintptrType := ctx.IntType(llvm.NewTargetData(mod.DataLayout()).PointerSize() * 8)
i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
// The block that cannot be reached with correct funcValues (to help the
// optimizer).
builder.SetInsertPointBefore(call)
defaultBlock := ctx.AddBasicBlock(call.InstructionParent().Parent(), "func.default")
builder.SetInsertPointAtEnd(defaultBlock)
builder.CreateUnreachable()
// Create the switch.
builder.SetInsertPointBefore(call)
sw := builder.CreateSwitch(funcID, defaultBlock, len(functions)+1)
// Split right after the switch. We will need to insert a few basic blocks
// in this gap.
nextBlock := llvmutil.SplitBasicBlock(builder, sw, llvm.NextBasicBlock(sw.InstructionParent()), "func.next")
// Temporarily set the insert point to set the correct debug insert location
// for the builder. It got destroyed by the SplitBasicBlock call.
builder.SetInsertPointBefore(call)
// The 0 case, which is actually a nil check.
nilBlock := ctx.InsertBasicBlock(nextBlock, "func.nil")
builder.SetInsertPointAtEnd(nilBlock)
nilPanic := mod.NamedFunction("runtime.nilPanic")
builder.CreateCall(nilPanic, []llvm.Value{llvm.Undef(i8ptrType), llvm.ConstNull(i8ptrType)}, "")
builder.CreateUnreachable()
sw.AddCase(llvm.ConstInt(uintptrType, 0, false), nilBlock)
// Gather the list of parameters for every call we're going to make.
callParams := make([]llvm.Value, call.OperandsCount()-1)
for i := range callParams {
callParams[i] = call.Operand(i)
}
// If the call produces a value, we need to get it using a PHI
// node.
phiBlocks := make([]llvm.BasicBlock, len(functions))
phiValues := make([]llvm.Value, len(functions))
for i, fn := range functions {
// Insert a switch case.
bb := ctx.InsertBasicBlock(nextBlock, "func.call"+strconv.Itoa(fn.id))
builder.SetInsertPointAtEnd(bb)
result := createCall(fn.funcPtr, callParams)
builder.CreateBr(nextBlock)
sw.AddCase(llvm.ConstInt(uintptrType, uint64(fn.id), false), bb)
phiBlocks[i] = bb
phiValues[i] = result
}
if call.Type().TypeKind() != llvm.VoidTypeKind {
if len(functions) > 0 {
// Create the PHI node so that the call result flows into the
// next block (after the split). This is only necessary when the
// call produced a value.
builder.SetInsertPointBefore(nextBlock.FirstInstruction())
phi := builder.CreatePHI(call.Type(), "")
phi.AddIncoming(phiValues, phiBlocks)
call.ReplaceAllUsesWith(phi)
} else {
// This is always a nil panic, so replace the call result with undef.
call.ReplaceAllUsesWith(llvm.Undef(call.Type()))
}
}
}

12
transform/func-lowering_test.go
Просмотреть файл

@ -1,12 +0,0 @@
package transform_test
import (
"testing"
"github.com/tinygo-org/tinygo/transform"
)
func TestFuncLowering(t *testing.T) {
t.Parallel()
testTransform(t, "testdata/func-lowering", transform.LowerFuncValues)
}

7
transform/optimizer.go
Просмотреть файл

@ -78,10 +78,6 @@ func Optimize(mod llvm.Module, config *compileopts.Config, optLevel, sizeLevel i
return errs
}
if config.FuncImplementation() == "switch" {
LowerFuncValues(mod)
}
// After interfaces are lowered, there are many more opportunities for
// interprocedural optimizations. To get them to work, function
// attributes have to be updated first.
@ -102,9 +98,6 @@ func Optimize(mod llvm.Module, config *compileopts.Config, optLevel, sizeLevel i
return []error{err}
}
LowerReflect(mod)
if config.FuncImplementation() == "switch" {
LowerFuncValues(mod)
}
errs := LowerInterrupts(mod)
if len(errs) > 0 {
return errs

71
transform/testdata/func-lowering.ll предоставленный
Просмотреть файл

@ -1,71 +0,0 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
%runtime.funcValueWithSignature = type { i32, i8* }
@"reflect/types.funcid:func:{basic:uint8}{}" = external constant i8
@"reflect/types.funcid:func:{basic:int}{}" = external constant i8
@"reflect/types.funcid:func:{}{basic:uint32}" = external constant i8
@"func1Uint8$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i8, i8*, i8*)* @func1Uint8 to i32), i8* @"reflect/types.funcid:func:{basic:uint8}{}" }
@"func2Uint8$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i8, i8*, i8*)* @func2Uint8 to i32), i8* @"reflect/types.funcid:func:{basic:uint8}{}" }
@"main$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @"main$1" to i32), i8* @"reflect/types.funcid:func:{basic:int}{}" }
@"main$2$withSignature" = constant %runtime.funcValueWithSignature { i32 ptrtoint (void (i32, i8*, i8*)* @"main$2" to i32), i8* @"reflect/types.funcid:func:{basic:int}{}" }
declare i32 @runtime.getFuncPtr(i8*, i32, i8*, i8*, i8*)
declare void @"internal/task.start"(i32, i8*, i32, i8*, i8*)
declare void @runtime.nilPanic(i8*, i8*)
declare void @"main$1"(i32, i8*, i8*)
declare void @"main$2"(i32, i8*, i8*)
declare void @func1Uint8(i8, i8*, i8*)
declare void @func2Uint8(i8, i8*, i8*)
; There are no functions with this signature used in a func value.
; This means that this should unconditionally nil panic.
define i32 @runFuncNone(i8*, i32, i8* %context, i8* %parentHandle) {
entry:
%2 = call i32 @runtime.getFuncPtr(i8* %0, i32 %1, i8* @"reflect/types.funcid:func:{}{basic:uint32}", i8* undef, i8* null)
%3 = inttoptr i32 %2 to i32 (i8*, i8*)*
%4 = icmp eq i32 (i8*, i8*)* %3, null
br i1 %4, label %fpcall.nil, label %fpcall.next
fpcall.nil:
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
fpcall.next:
%5 = call i32 %3(i8* %0, i8* undef)
ret i32 %5
}
; There are two functions with this signature used in a func value. That means
; that we'll have to check at runtime which of the two it is (or whether the
; func value is nil). This call will thus be lowered to a switch statement.
define void @runFunc2(i8*, i32, i8, i8* %context, i8* %parentHandle) {
entry:
%3 = call i32 @runtime.getFuncPtr(i8* %0, i32 %1, i8* @"reflect/types.funcid:func:{basic:uint8}{}", i8* undef, i8* null)
%4 = inttoptr i32 %3 to void (i8, i8*, i8*)*
%5 = icmp eq void (i8, i8*, i8*)* %4, null
br i1 %5, label %fpcall.nil, label %fpcall.next
fpcall.nil:
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
fpcall.next:
call void %4(i8 %2, i8* %0, i8* undef)
ret void
}
; Special case for internal/task.start.
define void @sleepFuncValue(i8*, i32, i8* nocapture readnone %context, i8* nocapture readnone %parentHandle) {
entry:
%2 = call i32 @runtime.getFuncPtr(i8* %0, i32 %1, i8* @"reflect/types.funcid:func:{basic:int}{}", i8* undef, i8* null)
call void @"internal/task.start"(i32 %2, i8* null, i32 undef, i8* undef, i8* null)
ret void
}

101
transform/testdata/func-lowering.out.ll предоставленный
Просмотреть файл

@ -1,101 +0,0 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
declare i32 @runtime.getFuncPtr(i8*, i32, i8*, i8*, i8*)
declare void @"internal/task.start"(i32, i8*, i32, i8*, i8*)
declare void @runtime.nilPanic(i8*, i8*)
declare void @"main$1"(i32, i8*, i8*)
declare void @"main$2"(i32, i8*, i8*)
declare void @func1Uint8(i8, i8*, i8*)
declare void @func2Uint8(i8, i8*, i8*)
define i32 @runFuncNone(i8* %0, i32 %1, i8* %context, i8* %parentHandle) {
entry:
br i1 false, label %fpcall.nil, label %fpcall.next
fpcall.nil: ; preds = %entry
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
fpcall.next: ; preds = %entry
switch i32 %1, label %func.default [
i32 0, label %func.nil
]
func.nil: ; preds = %fpcall.next
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
func.next: ; No predecessors!
ret i32 undef
func.default: ; preds = %fpcall.next
unreachable
}
define void @runFunc2(i8* %0, i32 %1, i8 %2, i8* %context, i8* %parentHandle) {
entry:
br i1 false, label %fpcall.nil, label %fpcall.next
fpcall.nil: ; preds = %entry
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
fpcall.next: ; preds = %entry
switch i32 %1, label %func.default [
i32 0, label %func.nil
i32 1, label %func.call1
i32 2, label %func.call2
]
func.nil: ; preds = %fpcall.next
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
func.call1: ; preds = %fpcall.next
call void @func1Uint8(i8 %2, i8* %0, i8* undef)
br label %func.next
func.call2: ; preds = %fpcall.next
call void @func2Uint8(i8 %2, i8* %0, i8* undef)
br label %func.next
func.next: ; preds = %func.call2, %func.call1
ret void
func.default: ; preds = %fpcall.next
unreachable
}
define void @sleepFuncValue(i8* %0, i32 %1, i8* nocapture readnone %context, i8* nocapture readnone %parentHandle) {
entry:
switch i32 %1, label %func.default [
i32 0, label %func.nil
i32 1, label %func.call1
i32 2, label %func.call2
]
func.nil: ; preds = %entry
call void @runtime.nilPanic(i8* undef, i8* null)
unreachable
func.call1: ; preds = %entry
call void @"internal/task.start"(i32 ptrtoint (void (i32, i8*, i8*)* @"main$1" to i32), i8* null, i32 undef, i8* undef, i8* null)
br label %func.next
func.call2: ; preds = %entry
call void @"internal/task.start"(i32 ptrtoint (void (i32, i8*, i8*)* @"main$2" to i32), i8* null, i32 undef, i8* undef, i8* null)
br label %func.next
func.next: ; preds = %func.call2, %func.call1
ret void
func.default: ; preds = %entry
unreachable
}

1
transform/transform_test.go
Просмотреть файл

@ -146,7 +146,6 @@ func compileGoFileForTesting(t *testing.T, filename string) llvm.Module {
CodeModel: config.CodeModel(),
RelocationModel: config.RelocationModel(),
Scheduler: config.Scheduler(),
FuncImplementation: config.FuncImplementation(),
AutomaticStackSize: config.AutomaticStackSize(),
Debug: true,
}