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-rw-r--r--src/asm2wasm.h1
-rw-r--r--src/binaryen-c.cpp1
-rw-r--r--src/passes/Print.cpp2
-rw-r--r--src/wasm-binary.h77
-rw-r--r--src/wasm-linker.cpp9
-rw-r--r--src/wasm-linker.h2
-rw-r--r--src/wasm-s-parser.h13
-rw-r--r--src/wasm.h5
8 files changed, 70 insertions, 40 deletions
diff --git a/src/asm2wasm.h b/src/asm2wasm.h
index afd85feb6..f00004b1f 100644
--- a/src/asm2wasm.h
+++ b/src/asm2wasm.h
@@ -777,6 +777,7 @@ void Asm2WasmBuilder::processAsm(Ref ast) {
// TODO: when not using aliasing function pointers, we could merge them by noticing that
// index 0 in each table is the null func, and each other index should only have one
// non-null func. However, that breaks down when function pointer casts are emulated.
+ wasm.table.exists = true;
if (wasm.table.segments.size() == 0) {
wasm.table.segments.emplace_back(wasm.allocator.alloc<Const>()->set(Literal(uint32_t(0))));
}
diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index 310757cad..b8933147f 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -756,6 +756,7 @@ void BinaryenSetFunctionTable(BinaryenModuleRef module, BinaryenFunctionRef* fun
}
auto* wasm = (Module*)module;
+ wasm->table.exists = true;
Table::Segment segment(wasm->allocator.alloc<Const>()->set(Literal(int32_t(0))));
for (BinaryenIndex i = 0; i < numFuncs; i++) {
segment.data.push_back(((Function*)funcs[i])->name);
diff --git a/src/passes/Print.cpp b/src/passes/Print.cpp
index 4f2c17d40..e5487d58e 100644
--- a/src/passes/Print.cpp
+++ b/src/passes/Print.cpp
@@ -726,7 +726,7 @@ struct PrintSExpression : public Visitor<PrintSExpression> {
visitGlobal(child.get());
o << maybeNewLine;
}
- if (curr->table.segments.size() > 0 || curr->table.initial > 0 || curr->table.max != Table::kMaxSize) {
+ if (curr->table.exists) {
visitTable(&curr->table);
o << maybeNewLine;
}
diff --git a/src/wasm-binary.h b/src/wasm-binary.h
index 485ad98c7..be09f640a 100644
--- a/src/wasm-binary.h
+++ b/src/wasm-binary.h
@@ -532,10 +532,11 @@ public:
writeTypes();
writeImports();
writeFunctionSignatures();
- writeFunctionTable();
+ writeFunctionTableDeclaration();
writeMemory();
writeGlobals();
writeExports();
+ writeTableElements();
writeStart();
writeFunctions();
writeDataSegments();
@@ -572,7 +573,7 @@ public:
}
void finishSection(int32_t start) {
- int32_t size = o.size() - start - 6; // section size does not include the 6 bytes of the code and size field
+ int32_t size = o.size() - start - 5; // section size does not include the 5 bytes of the size field itself
o.writeAt(start, U32LEB(size));
}
@@ -740,6 +741,7 @@ public:
if (numLocalsByType[f64]) o << U32LEB(numLocalsByType[f64]) << binaryWasmType(f64);
writeExpression(function->body);
+ o << int8_t(BinaryConsts::End);
size_t size = o.size() - start;
assert(size <= std::numeric_limits<uint32_t>::max());
if (debug) std::cerr << "body size: " << size << ", writing at " << sizePos << ", next starts at " << o.size() << std::endl;
@@ -841,14 +843,25 @@ public:
return mappedGlobals[name];
}
- void writeFunctionTable() {
- if (wasm->table.segments.size() == 0) return;
- if (debug) std::cerr << "== writeFunctionTable" << std::endl;
+ void writeFunctionTableDeclaration() {
+ if (!wasm->table.exists) return; // or is imported!!
+ if (debug) std::cerr << "== writeFunctionTableDeclaration" << std::endl;
auto start = startSection(BinaryConsts::Section::Table);
- o << U32LEB(wasm->table.initial);
- o << U32LEB(wasm->table.max);
+ o << U32LEB(1); // Declare 1 table.
+ o << U32LEB(BinaryConsts::ElementType::AnyFunc);
+ Address max = wasm->table.max == Table::kMaxSize ? Address(0) : wasm->table.max;
+ writeResizableLimits(wasm->table.initial, max);
+ finishSection(start);
+ }
+
+ void writeTableElements() {
+ if (!wasm->table.exists) return;
+ if (debug) std::cerr << "== writeTableElements" << std::endl;
+ auto start = startSection(BinaryConsts::Section::Element);
+
o << U32LEB(wasm->table.segments.size());
for (auto& segment : wasm->table.segments) {
+ o << U32LEB(0); // Table index; 0 in the MVP (and binaryen IR only has 1 table)
writeExpression(segment.offset);
o << int8_t(BinaryConsts::End);
o << U32LEB(segment.data.size());
@@ -1032,11 +1045,12 @@ public:
}
void visitCallIndirect(CallIndirect *curr) {
if (debug) std::cerr << "zz node: CallIndirect" << std::endl;
- recurse(curr->target);
+
for (auto* operand : curr->operands) {
recurse(operand);
}
- o << int8_t(BinaryConsts::CallIndirect) << U32LEB(curr->operands.size()) << U32LEB(getFunctionTypeIndex(curr->fullType));
+ recurse(curr->target);
+ o << int8_t(BinaryConsts::CallIndirect) << U32LEB(getFunctionTypeIndex(curr->fullType));
}
void visitGetLocal(GetLocal *curr) {
if (debug) std::cerr << "zz node: GetLocal " << (o.size() + 1) << std::endl;
@@ -1360,6 +1374,7 @@ public:
case BinaryConsts::Section::Function: readFunctionSignatures(); break;
case BinaryConsts::Section::Code: readFunctions(); break;
case BinaryConsts::Section::Export: readExports(); break;
+ case BinaryConsts::Section::Element: readTableElements(); break;
case BinaryConsts::Section::Global: {
readGlobals();
// imports can read global imports, so we run getGlobalName and create the mapping
@@ -1369,7 +1384,7 @@ public:
break;
}
case BinaryConsts::Section::Data: readDataSegments(); break;
- case BinaryConsts::Section::Table: readFunctionTable(); break;
+ case BinaryConsts::Section::Table: readFunctionTableDeclaration(); break;
default:
if (!readUserSection()) abort();
@@ -1621,7 +1636,8 @@ public:
case ExternalKind::Table: {
auto elementType = getU32LEB();
WASM_UNUSED(elementType);
- assert(elementType == BinaryConsts::ElementType::AnyFunc);
+ if (elementType != BinaryConsts::ElementType::AnyFunc) throw ParseException("Imported table type is not AnyFunc");
+ wasm.table.exists = true;
getResizableLimits(wasm.table.initial, &wasm.table.max);
break;
}
@@ -1675,7 +1691,7 @@ public:
assert(size > 0);
endOfFunction = pos + size;
auto type = functionTypes[i];
- if (debug) std::cerr << "reading" << i << std::endl;
+ if (debug) std::cerr << "reading " << i << std::endl;
size_t nextVar = 0;
auto addVar = [&]() {
Name name = cashew::IString(("var$" + std::to_string(nextVar++)).c_str(), false);
@@ -1719,6 +1735,7 @@ public:
currFunction = nullptr;
functions.push_back(func);
}
+ if (debug) std::cerr << " end function bodies" << std::endl;
}
std::map<Export*, Index> exportIndexes;
@@ -1868,17 +1885,29 @@ public:
std::map<Index, std::vector<Index>> functionTable;
- void readFunctionTable() {
- if (debug) std::cerr << "== readFunctionTable" << std::endl;
- wasm.table.initial = getU32LEB();
- wasm.table.max = getU32LEB();
- auto num = getU32LEB();
- for (size_t i = 0; i < num; i++) {
+ void readFunctionTableDeclaration() {
+ if (debug) std::cerr << "== readFunctionTableDeclaration" << std::endl;
+ auto numTables = getU32LEB();
+ if (numTables != 1) throw ParseException("Only 1 table definition allowed in MVP");
+ wasm.table.exists = true;
+ auto elemType = getU32LEB();
+ if (elemType != BinaryConsts::ElementType::AnyFunc) throw ParseException("ElementType must be AnyFunc in MVP");
+ getResizableLimits(wasm.table.initial, &wasm.table.max);
+ }
+
+ void readTableElements() {
+ if (debug) std::cerr << "== readTableElements" << std::endl;
+ auto numSegments = getU32LEB();
+ if (numSegments >= Table::kMaxSize) throw ParseException("Too many segments");
+ for (size_t i = 0; i < numSegments; i++) {
+ auto tableIndex = getU32LEB();
+ if (tableIndex != 0) throw ParseException("Table elements must refer to table 0 in MVP");
wasm.table.segments.emplace_back(readExpression());
- auto& temporary = functionTable[i];
+
+ auto& indexSegment = functionTable[i];
auto size = getU32LEB();
for (Index j = 0; j < size; j++) {
- temporary.push_back(getU32LEB());
+ indexSegment.push_back(getU32LEB());
}
}
}
@@ -1901,8 +1930,7 @@ public:
BinaryConsts::ASTNodes readExpression(Expression*& curr) {
if (pos == endOfFunction) {
- curr = nullptr;
- return BinaryConsts::End;
+ throw ParseException("Reached function end without seeing End opcode");
}
if (debug) std::cerr << "zz recurse into " << ++depth << " at " << pos << std::endl;
uint8_t code = getInt8();
@@ -2102,17 +2130,14 @@ public:
}
void visitCallIndirect(CallIndirect *curr) {
if (debug) std::cerr << "zz node: CallIndirect" << std::endl;
- auto arity = getU32LEB();
- WASM_UNUSED(arity);
auto* fullType = wasm.functionTypes.at(getU32LEB()).get();
curr->fullType = fullType->name;
auto num = fullType->params.size();
- assert(num == arity);
curr->operands.resize(num);
+ curr->target = popExpression();
for (size_t i = 0; i < num; i++) {
curr->operands[num - i - 1] = popExpression();
}
- curr->target = popExpression();
curr->type = fullType->result;
}
void visitGetLocal(GetLocal *curr) {
diff --git a/src/wasm-linker.cpp b/src/wasm-linker.cpp
index 587d3c9d8..014dfe6a9 100644
--- a/src/wasm-linker.cpp
+++ b/src/wasm-linker.cpp
@@ -122,7 +122,8 @@ void Linker::layout() {
// Pad the indirect function table with a dummy function
makeDummyFunction();
- ensureTableIsPopulated();
+ // Always create a table, even if it's empty.
+ out.wasm.table.exists = true;
// Pre-assign the function indexes
for (auto& pair : out.indirectIndexes) {
@@ -141,7 +142,7 @@ void Linker::layout() {
// Emit the pre-assigned function names in sorted order
for (const auto& P : functionNames) {
- ensureTableIsPopulated();
+ ensureTableSegment();
getTableDataRef().push_back(P.second);
}
@@ -319,7 +320,7 @@ void Linker::emscriptenGlue(std::ostream& o) {
emscripten::generateEmscriptenMetadata(o, out.wasm, segmentsByAddress, staticBump, out.initializerFunctions);
}
-void Linker::ensureTableIsPopulated() {
+void Linker::ensureTableSegment() {
if (out.wasm.table.segments.size() == 0) {
auto emptySegment = out.wasm.allocator.alloc<Const>()->set(Literal(uint32_t(0)));
out.wasm.table.segments.emplace_back(emptySegment);
@@ -340,7 +341,7 @@ std::vector<Name> Linker::getTableData() {
Index Linker::getFunctionIndex(Name name) {
if (!functionIndexes.count(name)) {
- ensureTableIsPopulated();
+ ensureTableSegment();
functionIndexes[name] = getTableData().size();
getTableDataRef().push_back(name);
if (debug) {
diff --git a/src/wasm-linker.h b/src/wasm-linker.h
index 2a6e3c01a..4a0e1e0b9 100644
--- a/src/wasm-linker.h
+++ b/src/wasm-linker.h
@@ -269,7 +269,7 @@ class Linker {
// Makes sure the table has a single segment, with offset 0,
// to which we can add content.
- void ensureTableIsPopulated();
+ void ensureTableSegment();
std::vector<Name>& getTableDataRef();
std::vector<Name> getTableData();
diff --git a/src/wasm-s-parser.h b/src/wasm-s-parser.h
index 90f5a2ea3..72949eb2b 100644
--- a/src/wasm-s-parser.h
+++ b/src/wasm-s-parser.h
@@ -1346,7 +1346,7 @@ private:
}
Expression* makeCallIndirect(Element& s) {
- if (!seenTable) throw ParseException("no table");
+ if (!wasm.table.exists) throw ParseException("no table");
auto ret = allocator.alloc<CallIndirect>();
IString type = s[1]->str();
auto* fullType = wasm.checkFunctionType(type);
@@ -1609,8 +1609,8 @@ private:
hasMemory = true;
} else if ((*s[3])[0]->str() == TABLE) {
im->kind = ExternalKind::Table;
- if (seenTable) throw ParseException("more than one table");
- seenTable = true;
+ if (wasm.table.exists) throw ParseException("more than one table");
+ wasm.table.exists = true;
} else if ((*s[3])[0]->str() == GLOBAL) {
im->kind = ExternalKind::Global;
} else {
@@ -1781,11 +1781,10 @@ private:
wasm.addGlobal(global.release());
}
- bool seenTable = false;
void parseTable(Element& s, bool preParseImport = false) {
- if (seenTable) throw ParseException("more than one table");
- seenTable = true;
+ if (wasm.table.exists) throw ParseException("more than one table");
+ wasm.table.exists = true;
Index i = 1;
if (i == s.size()) return; // empty table in old notation
if (s[i]->dollared()) {
@@ -1855,7 +1854,7 @@ private:
}
void parseInnerElem(Element& s, Index i = 1, Expression* offset = nullptr) {
- if (!seenTable) throw ParseException("elem without table", s.line, s.col);
+ if (!wasm.table.exists) throw ParseException("elem without table", s.line, s.col);
if (!offset) {
offset = allocator.alloc<Const>()->set(Literal(int32_t(0)));
}
diff --git a/src/wasm.h b/src/wasm.h
index 54461d2e7..ca9392d98 100644
--- a/src/wasm.h
+++ b/src/wasm.h
@@ -1466,11 +1466,14 @@ public:
}
};
+ // Currently the wasm object always 'has' one Table. It 'exists' if it has been defined or imported.
+ // The table can exist but be empty and have no defined initial or max size.
+ bool exists;
Name name;
Address initial, max;
std::vector<Segment> segments;
- Table() : initial(0), max(kMaxSize) {
+ Table() : exists(false), initial(0), max(kMaxSize) {
name = Name::fromInt(0);
}
};
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