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Emscripten stack simplification #1870

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merged 5 commits into from
Jan 16, 2019
Merged

Emscripten stack simplification #1870

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4c6845c
support asm.js globals with non-zero initial values
kripken Jan 15, 2019
4a5ae57
wip for wasm backend
kripken Jan 15, 2019
3e63cc2
update tests
kripken Jan 15, 2019
c5a1a23
better text
kripken Jan 15, 2019
af0baf0
rename to --initial-stack-pointer
kripken Jan 15, 2019
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2 changes: 1 addition & 1 deletion auto_update_tests.py
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,7 @@ def update_lld_tests():
if ext != '.out' and not os.path.exists(out_path):
continue
cmd = (WASM_EMSCRIPTEN_FINALIZE +
[wast_path, '-S', '--global-base=568'] + ext_args)
[wast_path, '-S', '--global-base=568', '--stack-base=16384'] + ext_args)
actual = run_command(cmd)
with open(out_path, 'w') as o:
o.write(actual)
Expand Down
2 changes: 1 addition & 1 deletion scripts/test/lld.py
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Expand Up @@ -38,7 +38,7 @@ def test_wasm_emscripten_finalize():
continue

cmd = (WASM_EMSCRIPTEN_FINALIZE +
[wast_path, '-S', '--global-base=568'] + ext_args)
[wast_path, '-S', '--global-base=568', '--stack-base=16384'] + ext_args)
actual = run_command(cmd)

if not os.path.exists(expected_file):
Expand Down
10 changes: 6 additions & 4 deletions src/asm2wasm.h
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Expand Up @@ -426,13 +426,16 @@ class Asm2WasmBuilder {
std::map<IString, MappedGlobal> mappedGlobals;

private:
void allocateGlobal(IString name, Type type) {
void allocateGlobal(IString name, Type type, Literal value=Literal()) {
assert(mappedGlobals.find(name) == mappedGlobals.end());
if (value.type == none) {
value = Literal::makeZero(type);
}
mappedGlobals.emplace(name, MappedGlobal(type));
wasm.addGlobal(builder.makeGlobal(
name,
type,
LiteralUtils::makeZero(type, wasm),
builder.makeConst(value),
Builder::Mutable
));
}
Expand Down Expand Up @@ -986,8 +989,7 @@ void Asm2WasmBuilder::processAsm(Ref ast) {
Ref value = pair[1];
if (value->isNumber()) {
// global int
assert(value->getNumber() == 0);
allocateGlobal(name, Type::i32);
allocateGlobal(name, Type::i32, Literal(int32_t(value->getInteger())));
} else if (value[0] == BINARY) {
// int import
assert(value[1] == OR && value[3]->isNumber() && value[3]->getNumber() == 0);
Expand Down
20 changes: 17 additions & 3 deletions src/tools/wasm-emscripten-finalize.cpp
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Expand Up @@ -36,6 +36,8 @@ using namespace cashew;
using namespace wasm;

int main(int argc, const char *argv[]) {
const uint64_t INVALID_BASE = -1;

std::string infile;
std::string outfile;
std::string inputSourceMapFilename;
Expand All @@ -46,7 +48,8 @@ int main(int argc, const char *argv[]) {
bool debugInfo = false;
bool legalizeJavaScriptFFI = true;
unsigned numReservedFunctionPointers = 0;
uint64_t globalBase;
uint64_t globalBase = INVALID_BASE;
uint64_t stackBase = INVALID_BASE;
Options options("wasm-emscripten-finalize",
"Performs Emscripten-specific transforms on .wasm files");
options
Expand Down Expand Up @@ -75,11 +78,16 @@ int main(int argc, const char *argv[]) {
const std::string &argument) {
numReservedFunctionPointers = std::stoi(argument);
})
.add("--global-base", "", "Where lld started to place globals",
.add("--global-base", "", "Where lld should start to place static globals",
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This command seems wrong. lld has already assigned all its globals before finalize is called.

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I see we pass the global base to both wasm-emscripten-finalize and to lld - is lld doing it in both bitcode linking and wasm object files? If so I can remove the flag to finalize.

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The only reason I can see that finalize needs to know this is because it wants to write "staticBump" to the metadata output about the binary. as long as we need staticBump we will to continue to pass this.

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i see, thanks. Ok, fixing the comment.

Options::Arguments::One,
[&globalBase](Options*, const std::string&argument ) {
globalBase = std::stoull(argument);
})
.add("--stack-base", "", "Where the stack begins",
Options::Arguments::One,
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Do we need this new argument? Won't the existing stack pointer assigned by lld be correct?

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We tell lld the size of the stack, but not its absolute location. Instead, finalize adds a wasm import of STACKTOP, and JS sends it over, and then the import gets assigned to the stack pointer lld created (which is mutable, so that way we couldn't assign it directly). This PR changes that, to just hardcode an initial value for the stack pointer, avoiding the import.

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Oh, are you saying, lld guesses the location of the stack (right after static allocations), and we can just leave it?

Even so, that wouldn't be right, as emscripten can add more static allocations after lld (in the JS compiler). Even without that, it seems safest to have one location that decides this stuff (Memory() in emscripten.py) and informs everything else.

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But in this new world, isn't the stack pointer already set by lld to the correct value? Does emscripten put stuff on the stack at startup? If so, doesn't it already have a way of moving the stack pointer by calling stackSave/stackRestore?

Perhaps this argument should be called "--initial-stack-pointer"?

I'm happy with the PR going in either way as I think its a step forward, I'm just trying to see possible improvements going foreword.

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lld's guess at the stack pointer location is incorrect due to static allocations from JS (see my last comment, may have been a race).

Emscripten won't use the stack from JS, as the wasm controls it - it needs to call into wasm to get the stack pointer and modify it. So it can modify it after the wasm is ready and the program started up.

Good idea to rename this to --initial-stack-pointer, done.

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@sbc100 sbc100 Jan 15, 2019 •
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My understanding is that the memory layout used by lld/wasm-backend is

1.  zero page
2.  static initialized data
3.  bss data
4.  stack (grows down)
5.  heap

I believe that emscripten adds global data after (3), which mean its clobber the end of the stack (since the stack growns down). So I believe the inital stack pointer set by lld (which grows down) will always be correct... but I'm not totally sure about all this right now.

Happy for this change to land as is and we can try to simplify and possible remove this argument.

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Yes, emscripten adds more stuff after 3. But it keeps the stack size fixed while doing so, so the initial stack location becomes higher - it pushes up the entire range reserved for the stack, top and bottom.

[&stackBase](Options*, const std::string&argument ) {
stackBase = std::stoull(argument);
})

.add("--input-source-map", "-ism", "Consume source map from the specified file",
Options::Arguments::One,
Expand Down Expand Up @@ -141,6 +149,12 @@ int main(int argc, const char *argv[]) {
uint32_t dataSize = 0;

if (!isSideModule) {
if (globalBase == INVALID_BASE) {
Fatal() << "globalBase must be set";
}
if (stackBase == INVALID_BASE) {
Fatal() << "stackBase must be set";
}
Export* dataEndExport = wasm.getExport("__data_end");
if (dataEndExport == nullptr) {
Fatal() << "__data_end export not found";
Expand Down Expand Up @@ -189,7 +203,7 @@ int main(int argc, const char *argv[]) {
} else {
generator.generateRuntimeFunctions();
generator.generateMemoryGrowthFunction();
generator.generateStackInitialization();
generator.generateStackInitialization(stackBase);
// emscripten calls this by default for side libraries so we only need
// to include in as a static ctor for main module case.
if (wasm.getExportOrNull("__post_instantiate")) {
Expand Down
2 changes: 1 addition & 1 deletion src/wasm-emscripten.h
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Expand Up @@ -36,7 +36,7 @@ class EmscriptenGlueGenerator {

void generateRuntimeFunctions();
Function* generateMemoryGrowthFunction();
void generateStackInitialization();
void generateStackInitialization(Address addr);

// Create thunks for use with emscripten Runtime.dynCall. Creates one for each
// signature in the indirect function table.
Expand Down
14 changes: 2 additions & 12 deletions src/wasm/wasm-emscripten.cpp
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Expand Up @@ -156,19 +156,9 @@ Function* EmscriptenGlueGenerator::generateMemoryGrowthFunction() {
return growFunction;
}

void EmscriptenGlueGenerator::generateStackInitialization() {
// Replace a global with a constant initial value with an imported
// initial value, which emscripten JS will send us.
// TODO: with mutable imported globals, we can avoid adding another
// global for the import.
Builder builder(wasm);
auto* import = builder.makeGlobal(STACK_INIT, i32, nullptr, Builder::Immutable);
import->module = ENV;
import->base = STACKTOP;
wasm.addGlobal(import);
void EmscriptenGlueGenerator::generateStackInitialization(Address addr) {
auto* stackPointer = getStackPointerGlobal();
assert(stackPointer->init->is<Const>());
stackPointer->init = builder.makeGetGlobal(import->name, i32);
stackPointer->init->cast<Const>()->value = Literal(int32_t(addr));
}

static bool hasI64ResultOrParam(FunctionType* ft) {
Expand Down
3 changes: 1 addition & 2 deletions test/lld/duplicate_imports.wast.out
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Expand Up @@ -9,15 +9,14 @@
(type $legaltype$puts2 (func (param i32 i32) (result i32)))
(type $legaltype$invoke_ffd (func (param i32 f64 f64) (result f64)))
(type $legaltype$invoke_ffd2 (func (param i32 f64 f64) (result f64)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "puts" (func $puts1 (param i32) (result i32)))
(import "env" "puts" (func $legalimport$puts2 (param i32 i32) (result i32)))
(import "env" "invoke_ffd" (func $legalimport$invoke_ffd (param i32 f64 f64) (result f64)))
(import "env" "invoke_ffd" (func $legalimport$invoke_ffd2 (param i32 f64 f64) (result f64)))
(memory $0 2)
(data (i32.const 568) "Hello, world\00")
(table $0 1 1 funcref)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66128))
(global $global$2 i32 (i32.const 581))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/em_asm.wast.out
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Expand Up @@ -7,14 +7,13 @@
(type $FUNCSIG$ii (func (param i32) (result i32)))
(type $FUNCSIG$iiii (func (param i32 i32 i32) (result i32)))
(type $FUNCSIG$iii (func (param i32 i32) (result i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "emscripten_asm_const_i" (func $emscripten_asm_const_i (param i32) (result i32)))
(import "env" "emscripten_asm_const_iii" (func $emscripten_asm_const_iii (param i32 i32 i32) (result i32)))
(import "env" "emscripten_asm_const_ii" (func $emscripten_asm_const_ii (param i32 i32) (result i32)))
(memory $0 2)
(data (i32.const 568) "{ Module.print(\"Hello world\"); }\00{ return $0 + $1; }\00{ Module.print(\"Got \" + $0); }\00")
(table $0 1 1 funcref)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66192))
(global $global$2 i32 (i32.const 652))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/em_asm_table.wast.out
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Expand Up @@ -4,12 +4,11 @@
(type $FUNCSIG$vii (func (param i32 i32)))
(type $FUNCSIG$iiii (func (param i32 i32 i32) (result i32)))
(import "env" "memory" (memory $0 8192))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "emscripten_log" (func $fimport$0 (param i32 i32)))
(import "env" "emscripten_asm_const_iii" (func $emscripten_asm_const_iii (param i32 i32 i32) (result i32)))
(table $0 159609 funcref)
(elem (i32.const 1) $fimport$0 $emscripten_asm_const_iii)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 1048))
(export "__data_end" (global $global$1))
(export "stackSave" (func $stackSave))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/hello_world.wast.mem.out
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Expand Up @@ -3,11 +3,10 @@
(type $1 (func (result i32)))
(type $2 (func))
(type $FUNCSIG$ii (func (param i32) (result i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "puts" (func $puts (param i32) (result i32)))
(memory $0 2)
(table $0 1 1 funcref)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66128))
(global $global$2 i32 (i32.const 581))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/hello_world.wast.out
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Expand Up @@ -3,12 +3,11 @@
(type $1 (func (result i32)))
(type $2 (func))
(type $FUNCSIG$ii (func (param i32) (result i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "puts" (func $puts (param i32) (result i32)))
(memory $0 2)
(data (i32.const 568) "Hello, world\00")
(table $0 1 1 funcref)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66128))
(global $global$2 i32 (i32.const 581))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/init.wast.out
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@@ -1,11 +1,10 @@
(module
(type $0 (func))
(type $1 (func (result i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(memory $0 2)
(data (i32.const 568) "\00\00\00\00\00\00\00\00")
(table $0 1 1 funcref)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66112))
(global $global$2 i32 (i32.const 576))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/recursive.wast.out
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Expand Up @@ -3,12 +3,11 @@
(type $1 (func (result i32)))
(type $2 (func))
(type $FUNCSIG$iii (func (param i32 i32) (result i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "printf" (func $printf (param i32 i32) (result i32)))
(memory $0 2)
(data (i32.const 568) "%d:%d\n\00Result: %d\n\00")
(table $0 1 1 funcref)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66128))
(global $global$2 i32 (i32.const 587))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/reserved_func_ptr.wast.jscall.out
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Expand Up @@ -18,7 +18,6 @@
(type $FUNCSIG$v (func))
(type $FUNCSIG$vii (func (param i32 i32)))
(type $FUNCSIG$viiii (func (param i32 i32 i32 i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "_Z4atoiPKc" (func $_Z4atoiPKc (param i32) (result i32)))
(import "env" "jsCall_ddi" (func $jsCall_ddi (param i32 f64 i32) (result f64)))
(import "env" "jsCall_fffi" (func $jsCall_fffi (param i32 f32 f32 i32) (result f32)))
Expand All @@ -29,7 +28,7 @@
(memory $0 2)
(table $0 21 21 funcref)
(elem (i32.const 1) $_Z18address_taken_funciii $_Z19address_taken_func2iii $jsCall_ddi_0 $jsCall_ddi_1 $jsCall_ddi_2 $jsCall_fffi_0 $jsCall_fffi_1 $jsCall_fffi_2 $jsCall_iii_0 $jsCall_iii_1 $jsCall_iii_2 $jsCall_v_0 $jsCall_v_1 $jsCall_v_2 $jsCall_vi_0 $jsCall_vi_1 $jsCall_vi_2 $jsCall_viii_0 $jsCall_viii_1 $jsCall_viii_2)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66112))
(global $global$2 i32 (i32.const 568))
(export "memory" (memory $0))
Expand Down
3 changes: 1 addition & 2 deletions test/lld/reserved_func_ptr.wast.out
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Expand Up @@ -8,12 +8,11 @@
(type $6 (func (param i32) (result i32)))
(type $FUNCSIG$ii (func (param i32) (result i32)))
(type $FUNCSIG$viii (func (param i32 i32 i32)))
(import "env" "STACKTOP" (global $stack$init i32))
(import "env" "_Z4atoiPKc" (func $_Z4atoiPKc (param i32) (result i32)))
(memory $0 2)
(table $0 3 3 funcref)
(elem (i32.const 1) $_Z18address_taken_funciii $_Z19address_taken_func2iii)
(global $global$0 (mut i32) (global.get $stack$init))
(global $global$0 (mut i32) (i32.const 16384))
(global $global$1 i32 (i32.const 66112))
(global $global$2 i32 (i32.const 568))
(export "memory" (memory $0))
Expand Down
3 changes: 3 additions & 0 deletions test/unit.asm.js
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Expand Up @@ -30,6 +30,8 @@ function asm(global, env, buffer) {
var HEAPF32 = new global.Float32Array(buffer);
var HEAPF64 = new global.Float64Array(buffer);

var nonZero = 1337;

function big_negative() {
var temp = 0.0;
temp = +-2147483648;
Expand Down Expand Up @@ -785,6 +787,7 @@ function asm(global, env, buffer) {
emterpretify_assertions_safeHeap();
call_emscripten_log();
mod_detectSign(1.0, 2.31, 9.78);
nonZero = nonZero + 1 | 0;
}

function v() {
Expand Down
7 changes: 7 additions & 0 deletions test/unit.fromasm
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Expand Up @@ -26,6 +26,7 @@
(global $Int (mut i32) (i32.const 0))
(global $Double (mut f64) (f64.const 0))
(global $n (mut i32) (global.get $n$asm2wasm$import))
(global $nonZero (mut i32) (i32.const 1337))
(global $exportedNumber i32 (i32.const 42))
(export "big_negative" (func $big_negative))
(export "pick" (func $big_negative))
Expand Down Expand Up @@ -1162,6 +1163,12 @@
)
)
)
(global.set $nonZero
(i32.add
(global.get $nonZero)
(i32.const 1)
)
)
)
(func $vi (; 55 ;) (; has Stack IR ;) (param $0 i32)
(nop)
Expand Down
7 changes: 7 additions & 0 deletions test/unit.fromasm.clamp
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Expand Up @@ -24,6 +24,7 @@
(global $Int (mut i32) (i32.const 0))
(global $Double (mut f64) (f64.const 0))
(global $n (mut i32) (global.get $n$asm2wasm$import))
(global $nonZero (mut i32) (i32.const 1337))
(global $exportedNumber i32 (i32.const 42))
(export "big_negative" (func $big_negative))
(export "pick" (func $big_negative))
Expand Down Expand Up @@ -1238,6 +1239,12 @@
)
)
)
(global.set $nonZero
(i32.add
(global.get $nonZero)
(i32.const 1)
)
)
)
(func $vi (; 57 ;) (; has Stack IR ;) (param $0 i32)
(nop)
Expand Down
7 changes: 7 additions & 0 deletions test/unit.fromasm.clamp.no-opts
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Expand Up @@ -31,6 +31,7 @@
(global $tempDoublePtr (mut i32) (global.get $tempDoublePtr$asm2wasm$import))
(global $n (mut i32) (global.get $n$asm2wasm$import))
(global $STACKTOP (mut i32) (global.get $STACKTOP$asm2wasm$import))
(global $nonZero (mut i32) (i32.const 1337))
(global $exportedNumber i32 (i32.const 42))
(export "big_negative" (func $big_negative))
(export "pick" (func $exportMe))
Expand Down Expand Up @@ -2215,6 +2216,12 @@
(f64.const 9.78)
)
)
(global.set $nonZero
(i32.add
(global.get $nonZero)
(i32.const 1)
)
)
)
(func $v (; 83 ;)
(nop)
Expand Down
7 changes: 7 additions & 0 deletions test/unit.fromasm.imprecise
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Expand Up @@ -22,6 +22,7 @@
(global $Int (mut i32) (i32.const 0))
(global $Double (mut f64) (f64.const 0))
(global $n (mut i32) (global.get $n$asm2wasm$import))
(global $nonZero (mut i32) (i32.const 1337))
(global $exportedNumber i32 (i32.const 42))
(export "big_negative" (func $big_negative))
(export "pick" (func $big_negative))
Expand Down Expand Up @@ -1141,6 +1142,12 @@
(f64.const 1)
)
)
(global.set $nonZero
(i32.add
(global.get $nonZero)
(i32.const 1)
)
)
)
(func $vi (; 54 ;) (; has Stack IR ;) (param $0 i32)
(nop)
Expand Down
7 changes: 7 additions & 0 deletions test/unit.fromasm.imprecise.no-opts
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Expand Up @@ -31,6 +31,7 @@
(global $tempDoublePtr (mut i32) (global.get $tempDoublePtr$asm2wasm$import))
(global $n (mut i32) (global.get $n$asm2wasm$import))
(global $STACKTOP (mut i32) (global.get $STACKTOP$asm2wasm$import))
(global $nonZero (mut i32) (i32.const 1337))
(global $exportedNumber i32 (i32.const 42))
(export "big_negative" (func $big_negative))
(export "pick" (func $exportMe))
Expand Down Expand Up @@ -2100,6 +2101,12 @@
(f64.const 9.78)
)
)
(global.set $nonZero
(i32.add
(global.get $nonZero)
(i32.const 1)
)
)
)
(func $v (; 78 ;)
(nop)
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