blob: aabd95bc231b9e6619798646ffeec029b7ba9c8c [file] [log] [blame]
// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/ast-loop-assignment-analyzer.h"
#include "src/parser.h"
#include "src/rewriter.h"
#include "src/scopes.h"
#include "test/cctest/cctest.h"
using namespace v8::internal;
using namespace v8::internal::compiler;
namespace {
const int kBufferSize = 1024;
struct TestHelper : public HandleAndZoneScope {
Handle<JSFunction> function;
LoopAssignmentAnalysis* result;
explicit TestHelper(const char* body)
: function(Handle<JSFunction>::null()), result(NULL) {
ScopedVector<char> program(kBufferSize);
SNPrintF(program, "function f(a,b,c) { %s; } f;", body);
v8::Local<v8::Value> v = CompileRun(program.start());
Handle<Object> obj = v8::Utils::OpenHandle(*v);
function = Handle<JSFunction>::cast(obj);
}
void CheckLoopAssignedCount(int expected, const char* var_name) {
// TODO(titzer): don't scope analyze every single time.
CompilationInfo info(function, main_zone());
CHECK(Parser::Parse(&info));
CHECK(Rewriter::Rewrite(&info));
CHECK(Scope::Analyze(&info));
Scope* scope = info.function()->scope();
AstValueFactory* factory = info.ast_value_factory();
CHECK_NE(NULL, scope);
if (result == NULL) {
AstLoopAssignmentAnalyzer analyzer(main_zone(), &info);
result = analyzer.Analyze();
CHECK_NE(NULL, result);
}
const i::AstRawString* name = factory->GetOneByteString(var_name);
i::Variable* var = scope->Lookup(name);
CHECK_NE(NULL, var);
if (var->location() == Variable::UNALLOCATED) {
CHECK_EQ(0, expected);
} else {
CHECK(var->IsStackAllocated());
CHECK_EQ(expected, result->GetAssignmentCountForTesting(scope, var));
}
}
};
}
TEST(SimpleLoop1) {
TestHelper f("var x = 0; while (x) ;");
f.CheckLoopAssignedCount(0, "x");
}
TEST(SimpleLoop2) {
const char* loops[] = {
"while (x) { var x = 0; }", "for(;;) { var x = 0; }",
"for(;x;) { var x = 0; }", "for(;x;x) { var x = 0; }",
"for(var i = x; x; x) { var x = 0; }", "for(y in 0) { var x = 0; }",
"for(y of 0) { var x = 0; }", "for(var x = 0; x; x++) { }",
"for(var x = 0; x++;) { }", "var x; for(;x;x++) { }",
"var x; do { x = 1; } while (0);", "do { var x = 1; } while (0);"};
for (size_t i = 0; i < arraysize(loops); i++) {
TestHelper f(loops[i]);
f.CheckLoopAssignedCount(1, "x");
}
}
TEST(ForInOf1) {
const char* loops[] = {
"for(x in 0) { }", "for(x of 0) { }",
};
for (size_t i = 0; i < arraysize(loops); i++) {
TestHelper f(loops[i]);
f.CheckLoopAssignedCount(0, "x");
}
}
TEST(Param1) {
TestHelper f("while (1) a = 0;");
f.CheckLoopAssignedCount(1, "a");
f.CheckLoopAssignedCount(0, "b");
f.CheckLoopAssignedCount(0, "c");
}
TEST(Param2) {
TestHelper f("for (;;) b = 0;");
f.CheckLoopAssignedCount(0, "a");
f.CheckLoopAssignedCount(1, "b");
f.CheckLoopAssignedCount(0, "c");
}
TEST(Param2b) {
TestHelper f("a; b; c; for (;;) b = 0;");
f.CheckLoopAssignedCount(0, "a");
f.CheckLoopAssignedCount(1, "b");
f.CheckLoopAssignedCount(0, "c");
}
TEST(Param3) {
TestHelper f("for(x in 0) c = 0;");
f.CheckLoopAssignedCount(0, "a");
f.CheckLoopAssignedCount(0, "b");
f.CheckLoopAssignedCount(1, "c");
}
TEST(Param3b) {
TestHelper f("a; b; c; for(x in 0) c = 0;");
f.CheckLoopAssignedCount(0, "a");
f.CheckLoopAssignedCount(0, "b");
f.CheckLoopAssignedCount(1, "c");
}
TEST(NestedLoop1) {
TestHelper f("while (x) { while (x) { var x = 0; } }");
f.CheckLoopAssignedCount(2, "x");
}
TEST(NestedLoop2) {
TestHelper f("while (0) { while (0) { var x = 0; } }");
f.CheckLoopAssignedCount(2, "x");
}
TEST(NestedLoop3) {
TestHelper f("while (0) { var y = 1; while (0) { var x = 0; } }");
f.CheckLoopAssignedCount(2, "x");
f.CheckLoopAssignedCount(1, "y");
}
TEST(NestedInc1) {
const char* loops[] = {
"while (1) a(b++);",
"while (1) a(0, b++);",
"while (1) a(0, 0, b++);",
"while (1) a(b++, 1, 1);",
"while (1) a(++b);",
"while (1) a + (b++);",
"while (1) (b++) + a;",
"while (1) a + c(b++);",
"while (1) throw b++;",
"while (1) switch (b++) {} ;",
"while (1) switch (a) {case (b++): 0; } ;",
"while (1) switch (a) {case b: b++; } ;",
"while (1) a == (b++);",
"while (1) a === (b++);",
"while (1) +(b++);",
"while (1) ~(b++);",
"while (1) new a(b++);",
"while (1) (b++).f;",
"while (1) a[b++];",
"while (1) (b++)();",
"while (1) [b++];",
"while (1) [0,b++];",
"while (1) var y = [11,b++,12];",
"while (1) var y = {f:11,g:(b++),h:12};",
"while (1) try {b++;} finally {};",
"while (1) try {} finally {b++};",
"while (1) try {b++;} catch (e) {};",
"while (1) try {} catch (e) {b++};",
"while (1) return b++;",
"while (1) (b++) ? b : b;",
"while (1) b ? (b++) : b;",
"while (1) b ? b : (b++);",
};
for (size_t i = 0; i < arraysize(loops); i++) {
TestHelper f(loops[i]);
f.CheckLoopAssignedCount(1, "b");
}
}
TEST(NestedAssign1) {
const char* loops[] = {
"while (1) a(b=1);",
"while (1) a(0, b=1);",
"while (1) a(0, 0, b=1);",
"while (1) a(b=1, 1, 1);",
"while (1) a + (b=1);",
"while (1) (b=1) + a;",
"while (1) a + c(b=1);",
"while (1) throw b=1;",
"while (1) switch (b=1) {} ;",
"while (1) switch (a) {case b=1: 0; } ;",
"while (1) switch (a) {case b: b=1; } ;",
"while (1) a == (b=1);",
"while (1) a === (b=1);",
"while (1) +(b=1);",
"while (1) ~(b=1);",
"while (1) new a(b=1);",
"while (1) (b=1).f;",
"while (1) a[b=1];",
"while (1) (b=1)();",
"while (1) [b=1];",
"while (1) [0,b=1];",
"while (1) var z = [11,b=1,12];",
"while (1) var y = {f:11,g:(b=1),h:12};",
"while (1) try {b=1;} finally {};",
"while (1) try {} finally {b=1};",
"while (1) try {b=1;} catch (e) {};",
"while (1) try {} catch (e) {b=1};",
"while (1) return b=1;",
"while (1) (b=1) ? b : b;",
"while (1) b ? (b=1) : b;",
"while (1) b ? b : (b=1);",
};
for (size_t i = 0; i < arraysize(loops); i++) {
TestHelper f(loops[i]);
f.CheckLoopAssignedCount(1, "b");
}
}
TEST(NestedLoops3) {
TestHelper f("var x, y, z, w; while (x++) while (y++) while (z++) ; w;");
f.CheckLoopAssignedCount(1, "x");
f.CheckLoopAssignedCount(2, "y");
f.CheckLoopAssignedCount(3, "z");
f.CheckLoopAssignedCount(0, "w");
}
TEST(NestedLoops3b) {
TestHelper f(
"var x, y, z, w;"
"while (1) { x=1; while (1) { y=1; while (1) z=1; } }"
"w;");
f.CheckLoopAssignedCount(1, "x");
f.CheckLoopAssignedCount(2, "y");
f.CheckLoopAssignedCount(3, "z");
f.CheckLoopAssignedCount(0, "w");
}
TEST(NestedLoops3c) {
TestHelper f(
"var x, y, z, w;"
"while (1) {"
" x++;"
" while (1) {"
" y++;"
" while (1) z++;"
" }"
" while (1) {"
" y++;"
" while (1) z++;"
" }"
"}"
"w;");
f.CheckLoopAssignedCount(1, "x");
f.CheckLoopAssignedCount(3, "y");
f.CheckLoopAssignedCount(5, "z");
f.CheckLoopAssignedCount(0, "w");
}