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language_c.c
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language_c.c
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// Copyright (c) Meta Platforms, Inc. and affiliates.
// SPDX-License-Identifier: LGPL-2.1-or-later
#include <assert.h>
#include <ctype.h>
#include <float.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "array.h"
#include "bitops.h"
#include "c_lexer.h"
#include "error.h"
#include "language.h" // IWYU pragma: associated
#include "lexer.h"
#include "minmax.h"
#include "object.h"
#include "program.h"
#include "string_builder.h"
#include "symbol.h"
#include "type.h"
#include "util.h"
#include "vector.h"
static struct drgn_error *
c_declare_variable(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
bool define_anonymous_type, struct string_builder *sb);
static struct drgn_error *
c_define_type(struct drgn_qualified_type qualified_type, size_t indent,
struct string_builder *sb);
static bool append_tabs(int n, struct string_builder *sb)
{
while (n-- > 0) {
if (!string_builder_appendc(sb, '\t'))
return false;
}
return true;
}
static struct drgn_error *c_variable_name(struct string_callback *name,
void *arg, struct string_builder *sb)
{
if (!string_builder_append(sb, arg))
return &drgn_enomem;
return NULL;
}
static struct drgn_error *c_append_qualifiers(enum drgn_qualifiers qualifiers,
struct string_builder *sb)
{
static const char *qualifier_names[] = {
"const", "volatile", "restrict", "_Atomic",
};
bool first = true;
unsigned int i;
static_assert((1 << array_size(qualifier_names)) - 1 ==
DRGN_ALL_QUALIFIERS, "missing C qualifier name");
for (i = 0; (1U << i) & DRGN_ALL_QUALIFIERS; i++) {
if (!(qualifiers & (1U << i)))
continue;
if (!first) {
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
}
if (!string_builder_append(sb, qualifier_names[i]))
return &drgn_enomem;
first = false;
}
return NULL;
}
static struct drgn_error *
c_declare_basic(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
struct string_builder *sb)
{
struct drgn_error *err;
if (!append_tabs(indent, sb))
return &drgn_enomem;
if (qualified_type.qualifiers) {
err = c_append_qualifiers(qualified_type.qualifiers, sb);
if (err)
return err;
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
}
if (!string_builder_append(sb,
drgn_type_kind(qualified_type.type) == DRGN_TYPE_VOID ?
"void" : drgn_type_name(qualified_type.type)))
return &drgn_enomem;
if (name) {
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
err = string_callback_call(name, sb);
if (err)
return err;
}
return NULL;
}
static struct drgn_error *
c_append_tagged_name(struct drgn_qualified_type qualified_type, size_t indent,
struct string_builder *sb)
{
struct drgn_error *err;
const char *keyword, *tag;
switch (drgn_type_kind(qualified_type.type)) {
case DRGN_TYPE_STRUCT:
keyword = "struct";
break;
case DRGN_TYPE_UNION:
keyword = "union";
break;
case DRGN_TYPE_CLASS:
keyword = "class";
break;
case DRGN_TYPE_ENUM:
keyword = "enum";
break;
default:
UNREACHABLE();
}
if (!append_tabs(indent, sb))
return &drgn_enomem;
if (qualified_type.qualifiers) {
err = c_append_qualifiers(qualified_type.qualifiers, sb);
if (err)
return err;
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
}
if (!string_builder_append(sb, keyword))
return &drgn_enomem;
tag = drgn_type_tag(qualified_type.type);
if (tag) {
if (!string_builder_appendc(sb, ' ') ||
!string_builder_append(sb, tag))
return &drgn_enomem;
}
return NULL;
}
static struct drgn_error *
c_declare_tagged(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
bool define_anonymous_type, struct string_builder *sb)
{
struct drgn_error *err;
bool anonymous = drgn_type_is_anonymous(qualified_type.type);
if (anonymous && define_anonymous_type)
err = c_define_type(qualified_type, indent, sb);
else
err = c_append_tagged_name(qualified_type, indent, sb);
if (err)
return err;
if (anonymous && !define_anonymous_type &&
!string_builder_append(sb, " <anonymous>"))
return &drgn_enomem;
if (name) {
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
err = string_callback_call(name, sb);
if (err)
return err;
}
return NULL;
}
static struct drgn_error *c_pointer_name(struct string_callback *name,
void *arg, struct string_builder *sb)
{
struct drgn_error *err;
struct drgn_qualified_type *qualified_type = arg;
struct drgn_qualified_type referenced_type;
enum drgn_type_kind referenced_kind;
bool parenthesize;
referenced_type = drgn_type_type(qualified_type->type);
referenced_kind = drgn_type_kind(referenced_type.type);
parenthesize = (referenced_kind == DRGN_TYPE_ARRAY ||
referenced_kind == DRGN_TYPE_FUNCTION);
if (parenthesize && !string_builder_appendc(sb, '('))
return &drgn_enomem;
if (!string_builder_appendc(sb, '*'))
return &drgn_enomem;
if (qualified_type->qualifiers) {
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
err = c_append_qualifiers(qualified_type->qualifiers, sb);
if (err)
return err;
if (name) {
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
}
}
err = string_callback_call(name, sb);
if (err)
return err;
if (parenthesize && !string_builder_appendc(sb, ')'))
return &drgn_enomem;
return NULL;
}
static struct drgn_error *
c_declare_pointer(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
struct string_builder *sb)
{
struct string_callback pointer_name = {
.fn = c_pointer_name,
.str = name,
.arg = &qualified_type,
};
struct drgn_qualified_type referenced_type;
referenced_type = drgn_type_type(qualified_type.type);
return c_declare_variable(referenced_type, &pointer_name, indent, false,
sb);
}
static struct drgn_error *c_array_name(struct string_callback *name, void *arg,
struct string_builder *sb)
{
struct drgn_error *err;
struct drgn_qualified_type *qualified_type = arg;
err = string_callback_call(name, sb);
if (err)
return err;
if (drgn_type_is_complete(qualified_type->type)) {
uint64_t length = drgn_type_length(qualified_type->type);
if (!string_builder_appendf(sb, "[%" PRIu64 "]", length))
return &drgn_enomem;
} else {
if (!string_builder_append(sb, "[]"))
return &drgn_enomem;
}
return NULL;
}
static struct drgn_error *
c_declare_array(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
struct string_builder *sb)
{
struct string_callback array_name = {
.fn = c_array_name,
.str = name,
.arg = &qualified_type,
};
struct drgn_qualified_type element_type;
element_type = drgn_type_type(qualified_type.type);
return c_declare_variable(element_type, &array_name, indent, false, sb);
}
static struct drgn_error *
c_declare_function(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
struct string_builder *sb)
{
struct drgn_error *err;
struct drgn_type_parameter *parameters;
size_t num_parameters, i;
struct drgn_qualified_type return_type;
if (!name) {
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
"function must have name");
}
parameters = drgn_type_parameters(qualified_type.type);
num_parameters = drgn_type_num_parameters(qualified_type.type);
return_type = drgn_type_type(qualified_type.type);
err = c_declare_variable(return_type, name, indent, false, sb);
if (err)
return err;
if (!string_builder_appendc(sb, '('))
return &drgn_enomem;
for (i = 0; i < num_parameters; i++) {
const char *parameter_name = parameters[i].name;
struct drgn_qualified_type parameter_type;
struct string_callback name_cb = {
.fn = c_variable_name,
.arg = (void *)parameter_name,
};
err = drgn_parameter_type(¶meters[i], ¶meter_type);
if (err)
return err;
if (i > 0) {
if (!string_builder_append(sb, ", "))
return &drgn_enomem;
}
err = c_declare_variable(parameter_type,
parameter_name && parameter_name[0] ?
&name_cb : NULL, 0, false, sb);
if (err)
return err;
}
if (num_parameters && drgn_type_is_variadic(qualified_type.type)) {
if (!string_builder_append(sb, ", ..."))
return &drgn_enomem;
} else if (!num_parameters &&
!drgn_type_is_variadic(qualified_type.type)) {
if (!string_builder_append(sb, "void"))
return &drgn_enomem;
}
if (!string_builder_appendc(sb, ')'))
return &drgn_enomem;
return NULL;
}
static struct drgn_error *
c_declare_variable(struct drgn_qualified_type qualified_type,
struct string_callback *name, size_t indent,
bool define_anonymous_type, struct string_builder *sb)
{
SWITCH_ENUM(drgn_type_kind(qualified_type.type)) {
case DRGN_TYPE_VOID:
case DRGN_TYPE_INT:
case DRGN_TYPE_BOOL:
case DRGN_TYPE_FLOAT:
case DRGN_TYPE_TYPEDEF:
return c_declare_basic(qualified_type, name, indent, sb);
case DRGN_TYPE_STRUCT:
case DRGN_TYPE_UNION:
case DRGN_TYPE_CLASS:
case DRGN_TYPE_ENUM:
return c_declare_tagged(qualified_type, name, indent,
define_anonymous_type, sb);
case DRGN_TYPE_POINTER:
return c_declare_pointer(qualified_type, name, indent, sb);
case DRGN_TYPE_ARRAY:
return c_declare_array(qualified_type, name, indent, sb);
case DRGN_TYPE_FUNCTION:
return c_declare_function(qualified_type, name, indent, sb);
default:
UNREACHABLE();
}
}
static struct drgn_error *
c_define_compound(struct drgn_qualified_type qualified_type, size_t indent,
struct string_builder *sb)
{
struct drgn_error *err;
struct drgn_type_member *members;
size_t num_members, i;
if (!drgn_type_is_complete(qualified_type.type)) {
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
"cannot get definition of incomplete compound type");
}
members = drgn_type_members(qualified_type.type);
num_members = drgn_type_num_members(qualified_type.type);
err = c_append_tagged_name(qualified_type, indent, sb);
if (err)
return err;
if (!string_builder_append(sb, " {\n"))
return &drgn_enomem;
for (i = 0; i < num_members; i++) {
struct drgn_qualified_type member_type;
uint64_t member_bit_field_size;
err = drgn_member_type(&members[i], &member_type,
&member_bit_field_size);
if (err)
return err;
const char *member_name = members[i].name;
struct string_callback name_cb = {
.fn = c_variable_name,
.arg = (void *)member_name,
};
err = c_declare_variable(member_type,
member_name && member_name[0] ?
&name_cb : NULL, indent + 1, true, sb);
if (err)
return err;
if (member_bit_field_size &&
!string_builder_appendf(sb, " : %" PRIu64,
member_bit_field_size))
return &drgn_enomem;
if (!string_builder_append(sb, ";\n"))
return &drgn_enomem;
}
if (!append_tabs(indent, sb) || !string_builder_appendc(sb, '}'))
return &drgn_enomem;
return NULL;
}
static struct drgn_error *
c_define_enum(struct drgn_qualified_type qualified_type, size_t indent,
struct string_builder *sb)
{
struct drgn_error *err;
const struct drgn_type_enumerator *enumerators;
size_t num_enumerators, i;
bool is_signed;
if (!drgn_type_is_complete(qualified_type.type)) {
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
"cannot get definition of incomplete enum type");
}
enumerators = drgn_type_enumerators(qualified_type.type);
num_enumerators = drgn_type_num_enumerators(qualified_type.type);
err = c_append_tagged_name(qualified_type, indent, sb);
if (err)
return err;
if (!string_builder_append(sb, " {\n"))
return &drgn_enomem;
is_signed = drgn_enum_type_is_signed(qualified_type.type);
for (i = 0; i < num_enumerators; i++) {
if (!append_tabs(indent + 1, sb) ||
!string_builder_append(sb, enumerators[i].name) ||
!string_builder_append(sb, " = "))
return &drgn_enomem;
if (is_signed) {
if (!string_builder_appendf(sb, "%" PRId64 ",\n",
enumerators[i].svalue))
return &drgn_enomem;
} else {
if (!string_builder_appendf(sb, "%" PRIu64 ",\n",
enumerators[i].uvalue))
return &drgn_enomem;
}
}
if (!append_tabs(indent, sb) || !string_builder_appendc(sb, '}'))
return &drgn_enomem;
return NULL;
}
static struct drgn_error *
c_define_typedef(struct drgn_qualified_type qualified_type, size_t indent,
struct string_builder *sb)
{
struct string_callback typedef_name = {
.fn = c_variable_name,
.arg = (char *)drgn_type_name(qualified_type.type),
};
struct drgn_qualified_type aliased_type;
struct drgn_error *err;
if (!append_tabs(indent, sb))
return &drgn_enomem;
if (qualified_type.qualifiers) {
err = c_append_qualifiers(qualified_type.qualifiers, sb);
if (err)
return err;
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
}
if (!string_builder_append(sb, "typedef "))
return &drgn_enomem;
aliased_type = drgn_type_type(qualified_type.type);
return c_declare_variable(aliased_type, &typedef_name, 0, true, sb);
}
static struct drgn_error *
c_define_type(struct drgn_qualified_type qualified_type, size_t indent,
struct string_builder *sb)
{
SWITCH_ENUM(drgn_type_kind(qualified_type.type)) {
case DRGN_TYPE_VOID:
case DRGN_TYPE_INT:
case DRGN_TYPE_BOOL:
case DRGN_TYPE_FLOAT:
return c_declare_basic(qualified_type, NULL, indent, sb);
case DRGN_TYPE_STRUCT:
case DRGN_TYPE_UNION:
case DRGN_TYPE_CLASS:
return c_define_compound(qualified_type, indent, sb);
case DRGN_TYPE_ENUM:
return c_define_enum(qualified_type, indent, sb);
case DRGN_TYPE_TYPEDEF:
return c_define_typedef(qualified_type, indent, sb);
case DRGN_TYPE_POINTER:
return c_declare_pointer(qualified_type, NULL, indent, sb);
case DRGN_TYPE_ARRAY:
return c_declare_array(qualified_type, NULL, indent, sb);
case DRGN_TYPE_FUNCTION:
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
"function type cannot be formatted");
default:
UNREACHABLE();
}
}
static struct drgn_error *
c_format_type_name_impl(struct drgn_qualified_type qualified_type,
struct string_builder *sb)
{
if (drgn_type_kind(qualified_type.type) == DRGN_TYPE_FUNCTION) {
struct string_callback name_cb = {
.fn = c_variable_name,
.arg = (void *)"",
};
return c_declare_function(qualified_type, &name_cb, 0, sb);
} else {
return c_declare_variable(qualified_type, NULL, 0, false, sb);
}
}
static struct drgn_error *
c_format_type_name(struct drgn_qualified_type qualified_type, char **ret)
{
struct drgn_error *err;
STRING_BUILDER(sb);
err = c_format_type_name_impl(qualified_type, &sb);
if (err)
return err;
if (!string_builder_null_terminate(&sb))
return &drgn_enomem;
*ret = string_builder_steal(&sb);
return NULL;
}
static struct drgn_error *
c_format_type(struct drgn_qualified_type qualified_type, char **ret)
{
struct drgn_error *err;
STRING_BUILDER(sb);
if (drgn_type_is_complete(qualified_type.type))
err = c_define_type(qualified_type, 0, &sb);
else
err = c_format_type_name_impl(qualified_type, &sb);
if (err)
return err;
if (!string_builder_null_terminate(&sb))
return &drgn_enomem;
*ret = string_builder_steal(&sb);
return NULL;
}
static struct drgn_error *
c_format_object_impl(const struct drgn_object *obj, size_t indent,
size_t one_line_columns, size_t multi_line_columns,
enum drgn_format_object_flags flags,
struct string_builder *sb);
static bool is_character_type(struct drgn_type *type)
{
switch (drgn_type_primitive(type)) {
case DRGN_C_TYPE_CHAR:
case DRGN_C_TYPE_SIGNED_CHAR:
case DRGN_C_TYPE_UNSIGNED_CHAR:
return true;
default:
return false;
}
}
static struct drgn_error *
c_format_character(unsigned char c, bool escape_single_quote,
bool escape_double_quote, struct string_builder *sb)
{
bool ret;
switch (c) {
case '\0':
ret = string_builder_append(sb, "\\0");
break;
case '\a':
ret = string_builder_append(sb, "\\a");
break;
case '\b':
ret = string_builder_append(sb, "\\b");
break;
case '\t':
ret = string_builder_append(sb, "\\t");
break;
case '\n':
ret = string_builder_append(sb, "\\n");
break;
case '\v':
ret = string_builder_append(sb, "\\v");
break;
case '\f':
ret = string_builder_append(sb, "\\f");
break;
case '\r':
ret = string_builder_append(sb, "\\r");
break;
case '"':
if (!escape_double_quote)
goto no_escape;
ret = string_builder_append(sb, "\\\"");
break;
case '\'':
if (!escape_single_quote)
goto no_escape;
ret = string_builder_append(sb, "\\'");
break;
case '\\':
ret = string_builder_append(sb, "\\\\");
break;
default:
if (c <= '\x1f' || c >= '\x7f') {
ret = string_builder_appendf(sb, "\\x%02x", c);
} else {
no_escape:
ret = string_builder_appendc(sb, c);
}
break;
}
return ret ? NULL : &drgn_enomem;
}
static struct drgn_error *
c_format_string(struct drgn_program *prog, uint64_t address, uint64_t length,
struct string_builder *sb)
{
struct drgn_error *err;
if (!string_builder_appendc(sb, '"'))
return &drgn_enomem;
while (length) {
unsigned char c;
err = drgn_program_read_memory(prog, &c, address++, 1, false);
if (err)
return err;
if (c == '\0') {
break;
} else {
err = c_format_character(c, false, true, sb);
if (err)
return err;
}
length--;
}
if (!string_builder_appendc(sb, '"'))
return &drgn_enomem;
return NULL;
}
static struct drgn_error *
c_format_int_object(const struct drgn_object *obj,
enum drgn_format_object_flags flags,
struct string_builder *sb)
{
struct drgn_error *err;
if ((flags & DRGN_FORMAT_OBJECT_CHAR) && is_character_type(obj->type)) {
union drgn_value value;
if (!string_builder_appendc(sb, '\''))
return &drgn_enomem;
err = drgn_object_read_integer(obj, &value);
if (err)
return err;
err = c_format_character(value.uvalue, true, false, sb);
if (err)
return err;
if (!string_builder_appendc(sb, '\''))
return &drgn_enomem;
return NULL;
}
union drgn_value value_mem;
const union drgn_value *value;
err = drgn_object_read_value(obj, &value_mem, &value);
if (err)
return err;
switch (obj->encoding) {
case DRGN_OBJECT_ENCODING_SIGNED:
if (!string_builder_appendf(sb, "%" PRId64, value->svalue)) {
err = &drgn_enomem;
goto out;
}
break;
case DRGN_OBJECT_ENCODING_UNSIGNED:
if (!string_builder_appendf(sb, "%" PRIu64, value->uvalue)) {
err = &drgn_enomem;
goto out;
}
break;
case DRGN_OBJECT_ENCODING_SIGNED_BIG:
case DRGN_OBJECT_ENCODING_UNSIGNED_BIG: {
if (!string_builder_append(sb, "0x")) {
err = &drgn_enomem;
goto out;
}
const uint8_t *buf = (uint8_t *)value->bufp;
size_t bytes = drgn_object_size(obj);
if (obj->little_endian) {
size_t i = bytes - 1;
while (i > 0 && buf[i] == 0)
i--;
if (!string_builder_appendf(sb, "%" PRIx8, buf[i])) {
err = &drgn_enomem;
goto out;
}
while (i-- > 0) {
if (!string_builder_appendf(sb, "%02" PRIx8, buf[i])) {
err = &drgn_enomem;
goto out;
}
}
} else {
size_t i = 0;
while (i < bytes - 1 && buf[i] == 0)
i++;
if (!string_builder_appendf(sb, "%" PRIx8, buf[i])) {
err = &drgn_enomem;
goto out;
}
while (++i < bytes) {
if (!string_builder_appendf(sb, "%02" PRIx8, buf[i])) {
err = &drgn_enomem;
goto out;
}
}
}
break;
}
default:
UNREACHABLE();
}
err = NULL;
out:
drgn_object_deinit_value(obj, value);
return err;
}
static struct drgn_error *
c_format_float_object(const struct drgn_object *obj, struct string_builder *sb)
{
struct drgn_error *err;
double fvalue;
err = drgn_object_read_float(obj, &fvalue);
if (err)
return err;
if (rint(fvalue) == fvalue) {
if (!string_builder_appendf(sb, "%.1f", fvalue))
return &drgn_enomem;
} else {
if (!string_builder_appendf(sb, "%.*g", DBL_DECIMAL_DIG,
fvalue))
return &drgn_enomem;
}
return NULL;
}
static struct drgn_error drgn_line_wrap = {
.code = DRGN_ERROR_STOP,
.message = "needs line wrap",
};
struct initializer_iter {
struct drgn_error *(*next)(struct initializer_iter *,
struct drgn_object *,
enum drgn_format_object_flags *);
void (*reset)(struct initializer_iter *);
struct drgn_error *(*append_designation)(struct initializer_iter *,
struct string_builder *);
};
static struct drgn_error *c_format_initializer(struct drgn_program *prog,
struct initializer_iter *iter,
size_t indent,
size_t one_line_columns,
size_t multi_line_columns,
bool same_line,
struct string_builder *sb)
{
struct drgn_error *err;
enum drgn_format_object_flags initializer_flags;
size_t brace, remaining_columns, start_columns;
DRGN_OBJECT(obj, prog);
/* First, try to fit everything on one line. */
brace = sb->len;
if (!string_builder_appendc(sb, '{'))
return &drgn_enomem;
if (__builtin_sub_overflow(one_line_columns, 1, &remaining_columns))
remaining_columns = 0;
for (;;) {
size_t initializer_start;
err = iter->next(iter, &obj, &initializer_flags);
if (err == &drgn_stop)
break;
else if (err)
return err;
if (!same_line) {
err = &drgn_line_wrap;
break;
} else if (sb->len == brace + 1) {
if (remaining_columns < 3) {
/*
* The preceding space and closing space and
* brace don't fit.
*/
err = &drgn_line_wrap;
break;
}
if (!string_builder_appendc(sb, ' '))
return &drgn_enomem;
remaining_columns--;
} else {
if (remaining_columns < 4) {
/*
* The preceding comma and space and closing
* space and brace don't fit.
*/
err = &drgn_line_wrap;
break;
}
if (!string_builder_append(sb, ", "))
return &drgn_enomem;
remaining_columns -= 2;
}
if (iter->append_designation) {
size_t designation_start = sb->len;
err = iter->append_designation(iter, sb);
if (err)
return err;
if (__builtin_sub_overflow(remaining_columns,
sb->len - designation_start,
&remaining_columns)) {
err = &drgn_line_wrap;
break;
}
}
initializer_start = sb->len;
err = c_format_object_impl(&obj, indent + 1,
remaining_columns - 2, 0,
initializer_flags, sb);
if (err == &drgn_line_wrap)
break;
else if (err)
return err;
if (__builtin_sub_overflow(remaining_columns,
sb->len - initializer_start,
&remaining_columns)) {
err = &drgn_line_wrap;
break;
}
}
if (err != &drgn_line_wrap) {
/* All of the initializers fit. */
if (sb->len == brace + 1) {
/* There were no initializers. */
if (string_builder_appendc(sb, '}'))
return NULL;
else
return &drgn_enomem;
} else if (remaining_columns >= 2) {
if (string_builder_append(sb, " }"))
return NULL;
else
return &drgn_enomem;
}
/* The final space and closing brace didn't fit. */
}
/* It didn't fit on one line. Try multiple lines. */
if (multi_line_columns == 0) {
/* We were asked to stay on one line. */
return &drgn_line_wrap;
}
sb->len = brace + 1;
if (__builtin_sub_overflow(multi_line_columns, 8 * (indent + 1),
&start_columns))
start_columns = 0;
remaining_columns = 0;
iter->reset(iter);
for (;;) {
size_t newline, designation_start, line_columns;
err = iter->next(iter, &obj, &initializer_flags);
if (err == &drgn_stop)
break;
else if (err)
return err;
newline = sb->len;
if (!string_builder_appendc(sb, '\n') ||
!append_tabs(indent + 1, sb))
return &drgn_enomem;
designation_start = sb->len;
line_columns = start_columns;
if (iter->append_designation) {
err = iter->append_designation(iter, sb);
if (err)
return err;
if (__builtin_sub_overflow(line_columns,
sb->len - designation_start,
&line_columns))
line_columns = 0;
}
if (line_columns > 1) {
size_t initializer_start = sb->len;
err = c_format_object_impl(&obj, 0, line_columns - 1,
0, initializer_flags, sb);
if (!err) {
size_t len = sb->len - designation_start;
if (same_line && len + 2 <= remaining_columns) {
/*
* It would've fit on the previous line.
* Move it over.
*/
sb->str[newline] = ' ';
memmove(&sb->str[newline + 1],
&sb->str[designation_start],
len);
sb->len = newline + 1 + len;
if (!string_builder_appendc(sb, ','))
return &drgn_enomem;
remaining_columns -= len + 2;
continue;
}
if (len < start_columns) {
/* It fit on the new line. */
if (!string_builder_appendc(sb, ','))
return &drgn_enomem;
remaining_columns =
start_columns - len - 1;
continue;
}
} else if (err != &drgn_line_wrap) {
return err;
}
/* It didn't fit. */
sb->len = initializer_start;
}
err = c_format_object_impl(&obj, indent + 1, 0,
multi_line_columns,
initializer_flags, sb);
if (err)
return err;
if (!string_builder_appendc(sb, ','))
return &drgn_enomem;
remaining_columns = 0;
}
if (!string_builder_appendc(sb, '\n') || !append_tabs(indent, sb) ||
!string_builder_appendc(sb, '}'))
return &drgn_enomem;
return NULL;
}
struct compound_initializer_state {
struct drgn_type_member *member, *end;
uint64_t bit_offset;
};
DEFINE_VECTOR(compound_initializer_stack, struct compound_initializer_state);