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instrument-js.cpp
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/*
instrument-js.cpp - JavaScript instrumentation routines
Copyright (C) 2007, 2008 siliconforks.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include "instrument-js.h"
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <jsapi.h>
#include <jsarena.h>
#include <jsatom.h>
#include <jsemit.h>
#include <jsexn.h>
#include <jsfun.h>
#include <jsinterp.h>
#include <jsiter.h>
#include <jsparse.h>
#include <jsregexp.h>
#include <jsscope.h>
#include <jsstr.h>
#include "encoding.h"
#include "global.h"
#include "highlight.h"
#include "resource-manager.h"
#include "util.h"
struct IfDirective {
const jschar * condition_start;
const jschar * condition_end;
uint16_t start_line;
uint16_t end_line;
struct IfDirective * next;
};
bool jscoverage_mozilla = false;
static bool * exclusive_directives = NULL;
static JSRuntime * runtime = NULL;
static JSContext * context = NULL;
static JSObject * global = NULL;
static JSVersion js_version = JSVERSION_ECMA_3;
/*
JSParseNode objects store line numbers starting from 1.
The lines array stores line numbers starting from 0.
*/
static const char * file_id = NULL;
static char * lines = NULL;
static uint16_t num_lines = 0;
void jscoverage_set_js_version(const char * version) {
js_version = JS_StringToVersion(version);
if (js_version != JSVERSION_UNKNOWN) {
return;
}
char * end;
js_version = (JSVersion) strtol(version, &end, 10);
if ((size_t) (end - version) != strlen(version)) {
fatal("invalid version: %s", version);
}
}
void jscoverage_init(void) {
runtime = JS_NewRuntime(8L * 1024L * 1024L);
if (runtime == NULL) {
fatal("cannot create runtime");
}
context = JS_NewContext(runtime, 8192);
if (context == NULL) {
fatal("cannot create context");
}
JS_SetVersion(context, js_version);
global = JS_NewObject(context, NULL, NULL, NULL);
if (global == NULL) {
fatal("cannot create global object");
}
if (! JS_InitStandardClasses(context, global)) {
fatal("cannot initialize standard classes");
}
}
void jscoverage_cleanup(void) {
JS_DestroyContext(context);
JS_DestroyRuntime(runtime);
}
static void print_javascript(const jschar * characters, size_t num_characters, Stream * f) {
for (size_t i = 0; i < num_characters; i++) {
jschar c = characters[i];
/*
XXX does not handle no-break space, other unicode "space separator"
*/
switch (c) {
case 0x9:
case 0xB:
case 0xC:
Stream_write_char(f, c);
break;
default:
if (32 <= c && c <= 126) {
Stream_write_char(f, c);
}
else {
Stream_printf(f, "\\u%04x", c);
}
break;
}
}
}
static void print_string(JSString * s, Stream * f) {
size_t length = JSSTRING_LENGTH(s);
jschar * characters = JSSTRING_CHARS(s);
for (size_t i = 0; i < length; i++) {
jschar c = characters[i];
if (32 <= c && c <= 126) {
switch (c) {
case '"':
Stream_write_string(f, "\\\"");
break;
/*
case '\'':
Stream_write_string(f, "\\'");
break;
*/
case '\\':
Stream_write_string(f, "\\\\");
break;
default:
Stream_write_char(f, c);
break;
}
}
else {
switch (c) {
case 0x8:
Stream_write_string(f, "\\b");
break;
case 0x9:
Stream_write_string(f, "\\t");
break;
case 0xa:
Stream_write_string(f, "\\n");
break;
/* IE doesn't support this */
/*
case 0xb:
Stream_write_string(f, "\\v");
break;
*/
case 0xc:
Stream_write_string(f, "\\f");
break;
case 0xd:
Stream_write_string(f, "\\r");
break;
default:
Stream_printf(f, "\\u%04x", c);
break;
}
}
}
}
static void print_string_atom(JSAtom * atom, Stream * f) {
assert(ATOM_IS_STRING(atom));
JSString * s = ATOM_TO_STRING(atom);
print_string(s, f);
}
static void print_regex(jsval value, Stream * f) {
assert(JSVAL_IS_STRING(value));
JSString * s = JSVAL_TO_STRING(value);
size_t length = JSSTRING_LENGTH(s);
jschar * characters = JSSTRING_CHARS(s);
for (size_t i = 0; i < length; i++) {
jschar c = characters[i];
if (32 <= c && c <= 126) {
Stream_write_char(f, c);
}
else {
Stream_printf(f, "\\u%04x", c);
}
}
}
static void print_quoted_string_atom(JSAtom * atom, Stream * f) {
assert(ATOM_IS_STRING(atom));
JSString * s = ATOM_TO_STRING(atom);
Stream_write_char(f, '"');
print_string(s, f);
Stream_write_char(f, '"');
}
static const char * get_op(uint8 op) {
switch(op) {
case JSOP_OR:
return "||";
case JSOP_AND:
return "&&";
case JSOP_BITOR:
return "|";
case JSOP_BITXOR:
return "^";
case JSOP_BITAND:
return "&";
case JSOP_EQ:
return "==";
case JSOP_NE:
return "!=";
case JSOP_STRICTEQ:
return "===";
case JSOP_STRICTNE:
return "!==";
case JSOP_LT:
return "<";
case JSOP_LE:
return "<=";
case JSOP_GT:
return ">";
case JSOP_GE:
return ">=";
case JSOP_LSH:
return "<<";
case JSOP_RSH:
return ">>";
case JSOP_URSH:
return ">>>";
case JSOP_ADD:
return "+";
case JSOP_SUB:
return "-";
case JSOP_MUL:
return "*";
case JSOP_DIV:
return "/";
case JSOP_MOD:
return "%";
default:
abort();
}
}
static void output_expression(JSParseNode * node, Stream * f, bool parenthesize_object_literals);
static void instrument_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if);
static void output_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if);
enum FunctionType {
FUNCTION_NORMAL,
FUNCTION_GETTER_OR_SETTER
};
static void output_for_in(JSParseNode * node, Stream * f) {
assert(node->pn_type == TOK_FOR);
assert(node->pn_arity == PN_BINARY);
Stream_write_string(f, "for ");
if (node->pn_iflags & JSITER_FOREACH) {
Stream_write_string(f, "each ");
}
Stream_write_char(f, '(');
output_expression(node->pn_left, f, false);
Stream_write_char(f, ')');
}
static void output_array_comprehension_or_generator_expression(JSParseNode * node, Stream * f) {
assert(node->pn_type == TOK_LEXICALSCOPE);
assert(node->pn_arity == PN_NAME);
JSParseNode * for_node = node->pn_expr;
assert(for_node->pn_type == TOK_FOR);
assert(for_node->pn_arity == PN_BINARY);
JSParseNode * p = for_node;
while (p->pn_type == TOK_FOR) {
p = p->pn_right;
}
JSParseNode * if_node = NULL;
if (p->pn_type == TOK_IF) {
if_node = p;
assert(if_node->pn_arity == PN_TERNARY);
p = if_node->pn_kid2;
}
switch (p->pn_arity) {
case PN_UNARY:
p = p->pn_kid;
if (p->pn_type == TOK_YIELD) {
/* for generator expressions */
p = p->pn_kid;
}
output_expression(p, f, false);
break;
case PN_LIST:
/*
When the array comprehension contains "if (0)", it will be optimized away and
the result will be an empty TOK_LC list.
*/
assert(p->pn_type == TOK_LC);
assert(p->pn_head == NULL);
/* the "1" is arbitrary (since the list is empty) */
Stream_write_char(f, '1');
break;
default:
abort();
break;
}
p = for_node;
while (p->pn_type == TOK_FOR) {
Stream_write_char(f, ' ');
output_for_in(p, f);
p = p->pn_right;
}
if (p->pn_type == TOK_LC) {
/* this is the optimized-away "if (0)" */
Stream_write_string(f, " if (0)");
}
else if (if_node) {
Stream_write_string(f, " if (");
output_expression(if_node->pn_kid1, f, false);
Stream_write_char(f, ')');
}
}
static void instrument_function(JSParseNode * node, Stream * f, int indent, enum FunctionType type) {
assert(node->pn_type == TOK_FUNCTION);
assert(node->pn_arity == PN_FUNC);
JSObject * object = node->pn_funpob->object;
assert(JS_ObjectIsFunction(context, object));
JSFunction * function = (JSFunction *) JS_GetPrivate(context, object);
assert(function);
assert(object == &function->object);
Stream_printf(f, "%*s", indent, "");
if (type == FUNCTION_NORMAL) {
Stream_write_string(f, "function ");
}
/* function name */
if (function->atom) {
print_string_atom(function->atom, f);
}
/*
function parameters - see JS_DecompileFunction in jsapi.cpp, which calls
js_DecompileFunction in jsopcode.cpp
*/
Stream_write_char(f, '(');
JSArenaPool pool;
JS_INIT_ARENA_POOL(&pool, "instrument_function", 256, 1, &context->scriptStackQuota);
jsuword * local_names = NULL;
if (JS_GET_LOCAL_NAME_COUNT(function)) {
local_names = js_GetLocalNameArray(context, function, &pool);
if (local_names == NULL) {
fatal("out of memory");
}
}
bool destructuring = false;
for (int i = 0; i < function->nargs; i++) {
if (i > 0) {
Stream_write_string(f, ", ");
}
JSAtom * param = JS_LOCAL_NAME_TO_ATOM(local_names[i]);
if (param == NULL) {
destructuring = true;
JSParseNode * expression = NULL;
assert(node->pn_body->pn_type == TOK_LC || node->pn_body->pn_type == TOK_SEQ);
JSParseNode * semi = node->pn_body->pn_head;
assert(semi->pn_type == TOK_SEMI);
JSParseNode * comma = semi->pn_kid;
assert(comma->pn_type == TOK_COMMA);
for (JSParseNode * p = comma->pn_head; p != NULL; p = p->pn_next) {
assert(p->pn_type == TOK_ASSIGN);
JSParseNode * rhs = p->pn_right;
assert(JSSTRING_LENGTH(ATOM_TO_STRING(rhs->pn_atom)) == 0);
if (rhs->pn_slot == i) {
expression = p->pn_left;
break;
}
}
assert(expression != NULL);
output_expression(expression, f, false);
}
else {
print_string_atom(param, f);
}
}
JS_FinishArenaPool(&pool);
Stream_write_string(f, ") {\n");
/* function body */
if (function->flags & JSFUN_EXPR_CLOSURE) {
/* expression closure - use output_statement instead of instrument_statement */
if (node->pn_body->pn_type == TOK_SEQ) {
assert(node->pn_body->pn_arity == PN_LIST);
assert(node->pn_body->pn_count == 2);
output_statement(node->pn_body->pn_head->pn_next, f, indent + 2, false);
}
else {
output_statement(node->pn_body, f, indent + 2, false);
}
}
else {
assert(node->pn_body->pn_type == TOK_LC);
assert(node->pn_body->pn_arity == PN_LIST);
JSParseNode * p = node->pn_body->pn_head;
if (destructuring) {
p = p->pn_next;
}
for (; p != NULL; p = p->pn_next) {
instrument_statement(p, f, indent + 2, false);
}
}
Stream_write_char(f, '}');
}
static void instrument_function_call(JSParseNode * node, Stream * f, bool parenthesize_for_new) {
JSParseNode * function_node = node->pn_head;
if (function_node->pn_type == TOK_FUNCTION) {
JSObject * object = function_node->pn_funpob->object;
assert(JS_ObjectIsFunction(context, object));
JSFunction * function = (JSFunction *) JS_GetPrivate(context, object);
assert(function);
assert(object == &function->object);
if (function_node->pn_flags & TCF_GENEXP_LAMBDA) {
/* it's a generator expression */
Stream_write_char(f, '(');
output_array_comprehension_or_generator_expression(function_node->pn_body, f);
Stream_write_char(f, ')');
return;
}
}
bool parenthesize_callee = parenthesize_for_new && (function_node->pn_type == TOK_LP); // e.g. new (require('foo'))()
if (parenthesize_callee) {
Stream_write_char(f, '(');
}
output_expression(function_node, f, false);
if (parenthesize_callee) {
Stream_write_char(f, ')');
}
Stream_write_char(f, '(');
for (struct JSParseNode * p = function_node->pn_next; p != NULL; p = p->pn_next) {
if (p != node->pn_head->pn_next) {
Stream_write_string(f, ", ");
}
output_expression(p, f, false);
}
Stream_write_char(f, ')');
}
static void instrument_declarations(JSParseNode * list, Stream * f) {
assert(list->pn_arity == PN_LIST);
for (JSParseNode * p = list->pn_head; p != NULL; p = p->pn_next) {
if (p != list->pn_head) {
Stream_write_string(f, ", ");
}
output_expression(p, f, false);
}
}
/*
See <Expressions> in jsparse.h.
TOK_FUNCTION is handled as a statement and as an expression.
TOK_DBLDOT is not handled (XML op).
TOK_DEFSHARP and TOK_USESHARP are not handled.
TOK_ANYNAME is not handled (XML op).
TOK_AT is not handled (XML op).
TOK_DBLCOLON is not handled.
TOK_XML* are not handled.
There seem to be some undocumented expressions:
TOK_INSTANCEOF binary
TOK_IN binary
*/
static void output_expression(JSParseNode * node, Stream * f, bool parenthesize_object_literals) {
switch (node->pn_type) {
case TOK_FUNCTION:
Stream_write_char(f, '(');
instrument_function(node, f, 0, FUNCTION_NORMAL);
Stream_write_char(f, ')');
break;
case TOK_COMMA:
for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
if (p != node->pn_head) {
Stream_write_string(f, ", ");
}
output_expression(p, f, parenthesize_object_literals);
}
break;
case TOK_ASSIGN:
output_expression(node->pn_left, f, parenthesize_object_literals);
Stream_write_char(f, ' ');
switch (node->pn_op) {
case JSOP_ADD:
case JSOP_SUB:
case JSOP_MUL:
case JSOP_MOD:
case JSOP_LSH:
case JSOP_RSH:
case JSOP_URSH:
case JSOP_BITAND:
case JSOP_BITOR:
case JSOP_BITXOR:
case JSOP_DIV:
Stream_printf(f, "%s", get_op(node->pn_op));
break;
default:
/* do nothing - it must be a simple assignment */
break;
}
Stream_write_string(f, "= ");
output_expression(node->pn_right, f, false);
break;
case TOK_HOOK:
output_expression(node->pn_kid1, f, parenthesize_object_literals);
Stream_write_string(f, "? ");
output_expression(node->pn_kid2, f, false);
Stream_write_string(f, ": ");
output_expression(node->pn_kid3, f, false);
break;
case TOK_OR:
case TOK_AND:
case TOK_BITOR:
case TOK_BITXOR:
case TOK_BITAND:
case TOK_EQOP:
case TOK_RELOP:
case TOK_SHOP:
case TOK_PLUS:
case TOK_MINUS:
case TOK_STAR:
case TOK_DIVOP:
switch (node->pn_arity) {
case PN_BINARY:
output_expression(node->pn_left, f, parenthesize_object_literals);
Stream_printf(f, " %s ", get_op(node->pn_op));
output_expression(node->pn_right, f, false);
break;
case PN_LIST:
for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
if (p == node->pn_head) {
output_expression(p, f, parenthesize_object_literals);
}
else {
Stream_printf(f, " %s ", get_op(node->pn_op));
output_expression(p, f, false);
}
}
break;
default:
abort();
}
break;
case TOK_UNARYOP:
switch (node->pn_op) {
case JSOP_NEG:
Stream_write_string(f, "- ");
output_expression(node->pn_kid, f, false);
break;
case JSOP_POS:
Stream_write_string(f, "+ ");
output_expression(node->pn_kid, f, false);
break;
case JSOP_NOT:
Stream_write_string(f, "! ");
output_expression(node->pn_kid, f, false);
break;
case JSOP_BITNOT:
Stream_write_string(f, "~ ");
output_expression(node->pn_kid, f, false);
break;
case JSOP_TYPEOF:
Stream_write_string(f, "typeof ");
output_expression(node->pn_kid, f, false);
break;
case JSOP_VOID:
Stream_write_string(f, "void ");
output_expression(node->pn_kid, f, false);
break;
default:
fatal_source(file_id, node->pn_pos.begin.lineno, "unknown operator (%d)", node->pn_op);
break;
}
break;
case TOK_INC:
case TOK_DEC:
/*
This is not documented, but node->pn_op tells whether it is pre- or post-increment.
*/
switch (node->pn_op) {
case JSOP_INCNAME:
case JSOP_INCPROP:
case JSOP_INCELEM:
Stream_write_string(f, "++");
output_expression(node->pn_kid, f, false);
break;
case JSOP_DECNAME:
case JSOP_DECPROP:
case JSOP_DECELEM:
Stream_write_string(f, "--");
output_expression(node->pn_kid, f, false);
break;
case JSOP_NAMEINC:
case JSOP_PROPINC:
case JSOP_ELEMINC:
output_expression(node->pn_kid, f, parenthesize_object_literals);
Stream_write_string(f, "++");
break;
case JSOP_NAMEDEC:
case JSOP_PROPDEC:
case JSOP_ELEMDEC:
output_expression(node->pn_kid, f, parenthesize_object_literals);
Stream_write_string(f, "--");
break;
default:
abort();
break;
}
break;
case TOK_NEW:
Stream_write_string(f, "new ");
instrument_function_call(node, f, true);
break;
case TOK_DELETE:
Stream_write_string(f, "delete ");
output_expression(node->pn_kid, f, false);
break;
case TOK_DOT:
/* numeric literals must be parenthesized */
switch (node->pn_expr->pn_type) {
case TOK_NUMBER:
Stream_write_char(f, '(');
output_expression(node->pn_expr, f, false);
Stream_write_char(f, ')');
break;
default:
output_expression(node->pn_expr, f, true);
break;
}
/*
This may have originally been x['foo-bar']. Because the string 'foo-bar'
contains illegal characters, we have to use the subscript syntax instead of
the dot syntax.
*/
assert(ATOM_IS_STRING(node->pn_atom));
{
JSString * s = ATOM_TO_STRING(node->pn_atom);
bool must_quote;
if (JSSTRING_LENGTH(s) == 0) {
must_quote = true;
}
else if (js_CheckKeyword(JSSTRING_CHARS(s), JSSTRING_LENGTH(s)) != TOK_EOF) {
must_quote = true;
}
else if (! js_IsIdentifier(s)) {
must_quote = true;
}
else {
must_quote = false;
}
if (must_quote) {
Stream_write_char(f, '[');
print_quoted_string_atom(node->pn_atom, f);
Stream_write_char(f, ']');
}
else {
Stream_write_char(f, '.');
print_string_atom(node->pn_atom, f);
}
}
break;
case TOK_LB:
output_expression(node->pn_left, f, false);
Stream_write_char(f, '[');
output_expression(node->pn_right, f, false);
Stream_write_char(f, ']');
break;
case TOK_LP:
instrument_function_call(node, f, false);
break;
case TOK_RB:
Stream_write_char(f, '[');
for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
if (p != node->pn_head) {
Stream_write_string(f, ", ");
}
/* TOK_COMMA is a special case: a hole in the array */
if (p->pn_type != TOK_COMMA) {
output_expression(p, f, false);
}
}
if (node->pn_extra == PNX_ENDCOMMA) {
Stream_write_char(f, ',');
}
Stream_write_char(f, ']');
break;
case TOK_RC:
if (parenthesize_object_literals) {
Stream_write_char(f, '(');
}
Stream_write_char(f, '{');
for (struct JSParseNode * p = node->pn_head; p != NULL; p = p->pn_next) {
if (p->pn_type != TOK_COLON) {
fatal_source(file_id, p->pn_pos.begin.lineno, "unsupported node type (%d)", p->pn_type);
}
if (p != node->pn_head) {
Stream_write_string(f, ", ");
}
/* check whether this is a getter or setter */
switch (p->pn_op) {
case JSOP_GETTER:
case JSOP_SETTER:
if (p->pn_op == JSOP_GETTER) {
Stream_write_string(f, "get ");
}
else {
Stream_write_string(f, "set ");
}
output_expression(p->pn_left, f, false);
Stream_write_char(f, ' ');
if (p->pn_right->pn_type != TOK_FUNCTION) {
fatal_source(file_id, p->pn_pos.begin.lineno, "expected function");
}
instrument_function(p->pn_right, f, 0, FUNCTION_GETTER_OR_SETTER);
break;
default:
output_expression(p->pn_left, f, false);
Stream_write_string(f, ": ");
output_expression(p->pn_right, f, false);
break;
}
}
Stream_write_char(f, '}');
if (parenthesize_object_literals) {
Stream_write_char(f, ')');
}
break;
case TOK_RP:
Stream_write_char(f, '(');
output_expression(node->pn_kid, f, false);
Stream_write_char(f, ')');
break;
case TOK_NAME:
print_string_atom(node->pn_atom, f);
if (node->pn_expr != NULL) {
Stream_write_string(f, " = ");
output_expression(node->pn_expr, f, false);
}
break;
case TOK_STRING:
print_quoted_string_atom(node->pn_atom, f);
break;
case TOK_REGEXP:
assert(node->pn_op == JSOP_REGEXP);
{
JSObject * object = node->pn_pob->object;
jsval result;
js_regexp_toString(context, object, &result);
print_regex(result, f);
}
break;
case TOK_NUMBER:
/*
A 64-bit IEEE 754 floating point number has a 52-bit fraction.
2^(-52) = 2.22 x 10^(-16)
Thus there are 16 significant digits.
To keep the output simple, special-case zero.
*/
if (node->pn_dval == 0.0) {
if (signbit(node->pn_dval)) {
Stream_write_string(f, "-0");
}
else {
Stream_write_string(f, "0");
}
}
else if (node->pn_dval == INFINITY) {
Stream_write_string(f, "Number.POSITIVE_INFINITY");
}
else if (node->pn_dval == -INFINITY) {
Stream_write_string(f, "Number.NEGATIVE_INFINITY");
}
else if (isnan(node->pn_dval)) {
Stream_write_string(f, "Number.NaN");
}
else {
Stream_printf(f, "%.15g", node->pn_dval);
}
break;
case TOK_PRIMARY:
switch (node->pn_op) {
case JSOP_TRUE:
Stream_write_string(f, "true");
break;
case JSOP_FALSE:
Stream_write_string(f, "false");
break;
case JSOP_NULL:
Stream_write_string(f, "null");
break;
case JSOP_THIS:
Stream_write_string(f, "this");
break;
/* jsscan.h mentions `super' ??? */
default:
abort();
}
break;
case TOK_INSTANCEOF:
output_expression(node->pn_left, f, parenthesize_object_literals);
Stream_write_string(f, " instanceof ");
output_expression(node->pn_right, f, false);
break;
case TOK_IN:
output_expression(node->pn_left, f, false);
Stream_write_string(f, " in ");
output_expression(node->pn_right, f, false);
break;
case TOK_LEXICALSCOPE:
assert(node->pn_arity == PN_NAME);
assert(node->pn_expr->pn_type == TOK_LET);
assert(node->pn_expr->pn_arity == PN_BINARY);
Stream_write_string(f, "let(");
assert(node->pn_expr->pn_left->pn_type == TOK_LP);
assert(node->pn_expr->pn_left->pn_arity == PN_LIST);
instrument_declarations(node->pn_expr->pn_left, f);
Stream_write_string(f, ") ");
output_expression(node->pn_expr->pn_right, f, true);
break;
case TOK_YIELD:
assert(node->pn_arity == PN_UNARY);
Stream_write_string(f, "yield");
if (node->pn_kid != NULL) {
Stream_write_char(f, ' ');
output_expression(node->pn_kid, f, true);
}
break;
case TOK_ARRAYCOMP:
assert(node->pn_arity == PN_LIST);
{
JSParseNode * block_node;
switch (node->pn_count) {
case 1:
block_node = node->pn_head;
break;
case 2:
block_node = node->pn_head->pn_next;
break;
default:
abort();
break;
}
Stream_write_char(f, '[');
output_array_comprehension_or_generator_expression(block_node, f);
Stream_write_char(f, ']');
}
break;
case TOK_VAR:
assert(node->pn_arity == PN_LIST);
Stream_write_string(f, "var ");
instrument_declarations(node, f);
break;
case TOK_LET:
assert(node->pn_arity == PN_LIST);
Stream_write_string(f, "let ");
instrument_declarations(node, f);
break;
default:
fatal_source(file_id, node->pn_pos.begin.lineno, "unsupported node type (%d)", node->pn_type);
}
}
static void output_statement(JSParseNode * node, Stream * f, int indent, bool is_jscoverage_if) {
switch (node->pn_type) {
case TOK_FUNCTION:
instrument_function(node, f, indent, FUNCTION_NORMAL);
Stream_write_char(f, '\n');
break;
case TOK_LC:
assert(node->pn_arity == PN_LIST);
/*
Stream_write_string(f, "{\n");
*/
for (struct JSParseNode * p = node->pn_u.list.head; p != NULL; p = p->pn_next) {
instrument_statement(p, f, indent, false);
}
/*
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "}\n");
*/
break;
case TOK_IF:
{
assert(node->pn_arity == PN_TERNARY);
uint16_t line = node->pn_pos.begin.lineno;
if (! is_jscoverage_if) {
if (line > num_lines) {
fatal("file %s contains more than 65,535 lines", file_id);
}
if (line >= 2 && exclusive_directives[line - 2]) {
is_jscoverage_if = true;
}
}
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "if (");
output_expression(node->pn_kid1, f, false);
Stream_write_string(f, ") {\n");
if (is_jscoverage_if && node->pn_kid3) {
uint16_t else_start = node->pn_kid3->pn_pos.begin.lineno;
uint16_t else_end = node->pn_kid3->pn_pos.end.lineno + 1;
Stream_printf(f, "%*s", indent + 2, "");
Stream_printf(f, "_$jscoverage['%s'].conditionals[%d] = %d;\n", file_id, else_start, else_end);
}
instrument_statement(node->pn_kid2, f, indent + 2, false);
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "}\n");
if (node->pn_kid3 || is_jscoverage_if) {
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "else {\n");
if (is_jscoverage_if) {
uint16_t if_start = node->pn_kid2->pn_pos.begin.lineno + 1;
uint16_t if_end = node->pn_kid2->pn_pos.end.lineno + 1;
Stream_printf(f, "%*s", indent + 2, "");
Stream_printf(f, "_$jscoverage['%s'].conditionals[%d] = %d;\n", file_id, if_start, if_end);
}
if (node->pn_kid3) {
instrument_statement(node->pn_kid3, f, indent + 2, is_jscoverage_if);
}
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "}\n");
}
break;
}
case TOK_SWITCH:
assert(node->pn_arity == PN_BINARY);
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "switch (");
output_expression(node->pn_left, f, false);
Stream_write_string(f, ") {\n");
{
JSParseNode * list = node->pn_right;
if (list->pn_type == TOK_LEXICALSCOPE) {
list = list->pn_expr;
}
for (struct JSParseNode * p = list->pn_head; p != NULL; p = p->pn_next) {
Stream_printf(f, "%*s", indent, "");
switch (p->pn_type) {
case TOK_CASE:
Stream_write_string(f, "case ");
output_expression(p->pn_left, f, false);
Stream_write_string(f, ":\n");
break;
case TOK_DEFAULT:
Stream_write_string(f, "default:\n");
break;
default:
abort();
break;
}
instrument_statement(p->pn_right, f, indent + 2, false);
}
}
Stream_printf(f, "%*s", indent, "");
Stream_write_string(f, "}\n");
break;
case TOK_CASE:
case TOK_DEFAULT:
abort();