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two pass encoding and resizing references #22

Merged
omicron merged 6 commits from encoding_start into main 2025-04-24 13:05:47 +00:00
Conversation 0 Commits 6 Files Changed 9 +506 -105
9 changed files with 506 additions and 105 deletions
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48
src/ast.h
View File

@ -5,6 +5,7 @@
#include "error.h"
#include "lexer.h"
#include "tokenlist.h"
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
@ -75,10 +76,26 @@ typedef struct register_ {
} register_t;
typedef struct opcode_encoding {
uint8_t encoding[32];
uint8_t buffer[32];
size_t len;
} opcode_encoding_t;
typedef struct instruction {
bool has_reference;
opcode_encoding_t encoding;
int64_t address;
} instruction_t;
typedef struct reference {
int64_t offset;
int64_t address;
operand_size_t size;
} reference_t;
typedef struct {
int64_t address;
} label_t;
struct ast_node {
node_id_t id;
tokenlist_entry_t *token_entry;
@ -89,10 +106,37 @@ struct ast_node {
union {
register_t reg;
number_t number;
opcode_encoding_t encoding;
instruction_t instruction;
reference_t reference;
label_t label;
} value;
};
static inline register_t *ast_node_register_value(ast_node_t *node) {
assert(node->id == NODE_REGISTER);
return &node->value.reg;
}
static inline number_t *ast_node_number_value(ast_node_t *node) {
assert(node->id == NODE_NUMBER);
return &node->value.number;
}
static inline instruction_t *ast_node_instruction_value(ast_node_t *node) {
assert(node->id == NODE_INSTRUCTION);
return &node->value.instruction;
}
static inline reference_t *ast_node_reference_value(ast_node_t *node) {
assert(node->id == NODE_LABEL_REFERENCE);
return &node->value.reference;
}
static inline label_t *ast_node_label_value(ast_node_t *node) {
assert(node->id == NODE_LABEL);
return &node->value.label;
}
/**
* @brief Allocates a new AST node
*

120
src/data/opcodes.c
View File

@ -138,8 +138,128 @@ opcode_data_t *const opcodes[] = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_64 },
},
},
// CALL rel32
&(opcode_data_t) {
.mnemonic = "call",
.opcode = 0xE8,
.opcode_extension = opcode_extension_none,
.encoding_class = ENCODING_DEFAULT,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_32 },
},
},
// CALL reg64
&(opcode_data_t) {
.mnemonic = "call",
.opcode = 0xFF,
.opcode_extension = 2,
.encoding_class = ENCODING_DEFAULT,
.rex_w_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_64 },
},
},
// CALL mem64
&(opcode_data_t) {
.mnemonic = "call",
.opcode = 0xFF,
.opcode_extension = 2,
.encoding_class = ENCODING_DEFAULT,
.rex_w_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_MEMORY, .size = OPERAND_SIZE_64 },
},
},
// JMP rel8 (short jump)
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xEB,
.opcode_extension = opcode_extension_none,
.encoding_class = ENCODING_DEFAULT,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_8 },
},
},
// JMP rel16
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xE9,
.opcode_extension = opcode_extension_none,
.encoding_class = ENCODING_DEFAULT,
.operand_size_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_16 },
},
},
// JMP reg16
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xFF,
.opcode_extension = 4,
.encoding_class = ENCODING_DEFAULT,
.operand_size_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_16 },
},
},
// JMP rel32 (near jump)
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xE9,
.opcode_extension = opcode_extension_none,
.encoding_class = ENCODING_DEFAULT,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_32 },
},
},
// JMP reg32
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xFF,
.opcode_extension = 4,
.encoding_class = ENCODING_DEFAULT,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_32 },
},
},
// JMP reg64
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xFF,
.opcode_extension = 4,
.encoding_class = ENCODING_DEFAULT,
.rex_w_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_64 },
},
},
// JMP mem64
&(opcode_data_t) {
.mnemonic = "jmp",
.opcode = 0xFF,
.opcode_extension = 4,
.encoding_class = ENCODING_DEFAULT,
.rex_w_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_MEMORY, .size = OPERAND_SIZE_64 },
},
},
nullptr,
};

261
src/encoder/encoder.c
View File

@ -6,6 +6,31 @@
#include <errno.h>
#include <string.h>
/**
* General encoder flow:
*
* There are 2 major passes the encoder does:
*
* First pass:
* - Run through the AST and collect information:
* - Set register values
* - Parse/set number values
* - Mark all instructions that use label references
* - Encode all instructions that don't use label references
* - Update addresses of all labels and instructions. Use an estimated
* instruction size for those instructions that use label references.
*
* Second pass:
* - Run through the AST for all instructions that use label references and
* collect size information using the estimated addresses from pass 1
* - Encode label references with the estimated addresses, this fixes their
* size.
* - Update all addresses
*
* Iteration:
* - Repeat the second pass until addresses converge
*/
error_t *const err_encoder_invalid_register =
&(error_t){.message = "Invalid register"};
error_t *const err_encoder_number_overflow =
@ -23,13 +48,15 @@ error_t *const err_encoder_not_implemented =
error_t *const err_encoder_unexpected_length =
&(error_t){.message = "Unexpectedly long encoding"};
error_t *encoder_alloc(encoder_t **output) {
error_t *encoder_alloc(encoder_t **output, ast_node_t *ast) {
*output = nullptr;
encoder_t *encoder = calloc(1, sizeof(encoder_t));
if (encoder == nullptr)
return err_allocation_failed;
encoder->ast = ast;
error_t *err = symbol_table_alloc(&encoder->symbols);
if (err) {
free(encoder);
@ -213,16 +240,15 @@ static inline uint8_t modrm_rm(uint8_t modrm, register_id_t id) {
return (modrm & ~modrm_rm_mask) | (id & 0b111);
}
/**
* Perform the initial pass over the AST. Records all symbols and sets the
* values of registers and numbers.
*/
error_t *encoder_first_pass(encoder_t *encoder, ast_node_t *node) {
error_t *encoder_collect_info(encoder_t *encoder, ast_node_t *node,
ast_node_t *statement) {
error_t *err = nullptr;
if (encoder_is_symbols_node(node))
err = symbol_table_update(encoder->symbols, node);
else if (node->id == NODE_NUMBER)
if (encoder_is_symbols_node(node)) {
err = symbol_table_update(encoder->symbols, node, statement);
if (statement->id == NODE_INSTRUCTION)
statement->value.instruction.has_reference = true;
} else if (node->id == NODE_NUMBER)
err = encoder_set_number_value(node);
else if (node->id == NODE_REGISTER)
err = encoder_set_register_value(node);
@ -230,7 +256,8 @@ error_t *encoder_first_pass(encoder_t *encoder, ast_node_t *node) {
return err;
for (size_t i = 0; i < node->len; ++i) {
error_t *err = encoder_first_pass(encoder, node->children[i]);
error_t *err =
encoder_collect_info(encoder, node->children[i], statement);
if (err)
return err;
}
@ -242,7 +269,7 @@ bool is_operand_match(operand_info_t *info, ast_node_t *operand) {
switch (info->kind) {
case OPERAND_REGISTER:
return operand->id == NODE_REGISTER &&
operand->value.reg.size == info->size;
ast_node_register_value(operand)->size == info->size;
case OPERAND_MEMORY:
return operand->id == NODE_MEMORY;
case OPERAND_IMMEDIATE: {
@ -251,13 +278,10 @@ bool is_operand_match(operand_info_t *info, ast_node_t *operand) {
ast_node_t *child = operand->children[0];
if (child->id == NODE_NUMBER)
return (child->value.number.size & info->size) > 0;
else if (child->id == NODE_LABEL_REFERENCE)
return info->size == OPERAND_SIZE_32;
// FIXME: first pass should give us information about the distance of
// the label reference so we can pick a size more appropriately instead
// of just defaulting to 32 bits
break;
return (ast_node_number_value(child)->size & info->size) > 0;
else if (child->id == NODE_LABEL_REFERENCE) {
return info->size &= ast_node_reference_value(child)->size;
}
} // end OPERAND_IMMEDIATE case
}
assert(false && "unreachable");
@ -313,7 +337,7 @@ error_t *encode_one_register_in_opcode(encoder_t *encoder,
(void)encoder;
(void)opcode;
register_id_t id = operands->children[0]->value.reg.id;
register_id_t id = ast_node_register_value(operands->children[0])->id;
encoding->buffer[encoding->len - 1] |= id & 0b111;
if ((id & 0b1000) > 0) {
*rex |= rex_prefix_r;
@ -328,7 +352,7 @@ error_t *encode_one_register(encoder_t *encoder, opcode_data_t *opcode,
assert(operands->len == 1);
assert(operands->children[0]->id == NODE_REGISTER);
register_id_t id = operands->children[0]->value.reg.id;
register_id_t id = ast_node_register_value(operands->children[0])->id;
uint8_t modrm = modrm_mod_register;
@ -362,9 +386,9 @@ error_t *encode_one_immediate(encoder_t *encoder, opcode_data_t *opcode,
assert(immediate->id == NODE_NUMBER ||
immediate->id == NODE_LABEL_REFERENCE);
if (immediate->id == NODE_NUMBER) {
uint64_t value = immediate->value.number.value;
operand_size_t size = opcode->operands[0].size;
if (immediate->id == NODE_NUMBER) {
uint64_t value = ast_node_number_value(immediate)->value;
error_t *err = nullptr;
switch (size) {
case OPERAND_SIZE_8:
@ -384,11 +408,22 @@ error_t *encode_one_immediate(encoder_t *encoder, opcode_data_t *opcode,
}
return err;
} else {
// FIXME: this still assumes references are always 32 bit
uint32_t value = 0xDEADBEEF;
return bytes_append_uint32(encoding, value);
reference_t *reference = ast_node_reference_value(immediate);
switch (size) {
case OPERAND_SIZE_64:
return bytes_append_uint64(encoding, reference->address);
case OPERAND_SIZE_32:
return bytes_append_uint32(encoding, reference->offset);
case OPERAND_SIZE_16:
return bytes_append_uint16(encoding, reference->offset);
case OPERAND_SIZE_8:
return bytes_append_uint8(encoding, reference->offset);
default:
assert(false && "intentionally unhandled");
}
}
__builtin_unreachable();
}
error_t *encode_one_memory(encoder_t *encoder, opcode_data_t *opcode,
ast_node_t *operands, bytes_t *encoding,
@ -456,7 +491,8 @@ error_t *encoder_encode_instruction(encoder_t *encoder,
return err;
// produce the actual encoding output in the NODE_INSTRUCTION value
uint8_t *output = instruction->value.encoding.encoding;
instruction_t *instruction_value = ast_node_instruction_value(instruction);
uint8_t *output = instruction_value->encoding.buffer;
size_t output_len = 0;
// Handle prefixes
@ -475,24 +511,166 @@ error_t *encoder_encode_instruction(encoder_t *encoder,
memcpy(output + output_len, encoding->buffer, encoding->len);
output_len += encoding->len;
instruction->value.encoding.len = output_len;
instruction_value->encoding.len = output_len;
return nullptr;
}
/**
* Perform the second pass that performs actual encoding. Will use
* placeholder values for label references because instruction size has not
* yet been determined.
* Initial guess for instruction size of instructions that contain a label
* reference
*/
error_t *encoder_encoding_pass(encoder_t *encoder, ast_node_t *root) {
constexpr size_t instruction_size_estimate = 10;
/**
* Perform the initial pass over the AST.
*
* - Collect information about the operands
* - parse and set number values
* - set the register values
* - determine if label references are used by an instruction
* - encode instructions that don't use label references
* - determine estimated addresses of each statement
*
*/
error_t *encoder_first_pass(encoder_t *encoder) {
ast_node_t *root = encoder->ast;
assert(root->id == NODE_PROGRAM);
uintptr_t address = 0;
for (size_t i = 0; i < root->len; ++i) {
if (root->children[i]->id != NODE_INSTRUCTION)
continue;
ast_node_t *instruction = root->children[i];
error_t *err = encoder_encode_instruction(encoder, instruction);
ast_node_t *statement = root->children[i];
error_t *err = encoder_collect_info(encoder, statement, statement);
if (err)
return err;
if (statement->id == NODE_INSTRUCTION &&
ast_node_instruction_value(statement)->has_reference == false) {
err = encoder_encode_instruction(encoder, statement);
if (err)
return err;
instruction_t *instruction = ast_node_instruction_value(statement);
instruction->address = address;
address += instruction->encoding.len;
} else if (statement->id == NODE_INSTRUCTION) {
instruction_t *instruction = ast_node_instruction_value(statement);
instruction->encoding.len = instruction_size_estimate;
instruction->address = address;
address += instruction_size_estimate;
} else if (statement->id == NODE_LABEL) {
label_t *label = ast_node_label_value(statement);
label->address = address;
}
}
return nullptr;
}
operand_size_t signed_to_size_mask(int64_t value) {
operand_size_t size = OPERAND_SIZE_64;
if (value >= INT8_MIN && value <= INT8_MAX)
size |= OPERAND_SIZE_8;
if (value >= INT16_MIN && value <= INT16_MAX)
size |= OPERAND_SIZE_16;
if (value >= INT32_MIN && value <= INT32_MAX)
size |= OPERAND_SIZE_32;
return size;
}
int64_t statement_offset(ast_node_t *from, ast_node_t *to) {
assert(from->id == NODE_INSTRUCTION);
assert(to->id == NODE_LABEL);
instruction_t *instruction = ast_node_instruction_value(from);
int64_t from_addr = instruction->address + instruction->encoding.len;
int64_t to_addr = ast_node_label_value(to)->address;
return to_addr - from_addr;
}
error_t *encoder_collect_reference_info(encoder_t *encoder, ast_node_t *node,
ast_node_t *statement) {
assert(statement->id == NODE_INSTRUCTION);
if (node->id == NODE_LABEL_REFERENCE) {
const char *name = node->token_entry->token.value;
symbol_t *symbol = symbol_table_lookup(encoder->symbols, name);
assert(symbol && symbol->statement &&
symbol->statement->id == NODE_LABEL);
int64_t offset = statement_offset(statement, symbol->statement);
int64_t absolute = ast_node_label_value(symbol->statement)->address;
operand_size_t size = signed_to_size_mask(offset);
node->value.reference.address = absolute;
node->value.reference.offset = offset;
node->value.reference.size = size;
}
for (size_t i = 0; i < node->len; ++i) {
error_t *err = encoder_collect_reference_info(
encoder, node->children[i], statement);
if (err)
return err;
}
return nullptr;
}
bool encoder_should_reencode(ast_node_t *statement) {
if (statement->id != NODE_INSTRUCTION)
return false;
instruction_t *instruction = ast_node_instruction_value(statement);
return instruction->has_reference;
}
void set_statement_address(ast_node_t *statement, int64_t address) {
if (statement->id == NODE_INSTRUCTION) {
ast_node_instruction_value(statement)->address = address;
} else if (statement->id == NODE_LABEL) {
ast_node_label_value(statement)->address = address;
}
}
size_t get_statement_length(ast_node_t *statement) {
if (statement->id != NODE_INSTRUCTION)
return 0;
return ast_node_instruction_value(statement)->encoding.len;
}
/**
* Perform the second pass. Updates the label info and encodes all instructions
* that have a label reference.that performs actual encoding.
*/
error_t *encoder_second_pass(encoder_t *encoder, bool *did_update) {
ast_node_t *root = encoder->ast;
*did_update = false;
int64_t address = 0;
for (size_t i = 0; i < root->len; ++i) {
ast_node_t *statement = root->children[i];
set_statement_address(statement, address);
size_t before = get_statement_length(statement);
if (encoder_should_reencode(statement)) {
error_t *err =
encoder_collect_reference_info(encoder, statement, statement);
if (err)
return err;
err = encoder_encode_instruction(encoder, statement);
if (err)
return err;
}
size_t after = get_statement_length(statement);
*did_update = *did_update || (before != after);
address += after;
}
return nullptr;
}
@ -515,12 +693,19 @@ error_t *encoder_check_symbols(encoder_t *encoder) {
return nullptr;
}
error_t *encoder_encode(encoder_t *encoder, ast_node_t *ast) {
error_t *err = encoder_first_pass(encoder, ast);
error_t *encoder_encode(encoder_t *encoder) {
error_t *err = encoder_first_pass(encoder);
if (err)
return err;
err = encoder_check_symbols(encoder);
if (err)
return err;
return encoder_encoding_pass(encoder, ast);
bool did_update = true;
for (int i = 0; i < 10 && did_update; ++i) {
err = encoder_second_pass(encoder, &did_update);
if (err)
return err;
}
return nullptr;
}

5
src/encoder/encoder.h
View File

@ -5,6 +5,7 @@
typedef struct encoder {
symbol_table_t *symbols;
ast_node_t *ast;
} encoder_t;
constexpr uint8_t modrm_mod_memory = 0b00'000'000;
@ -16,8 +17,8 @@ constexpr uint8_t modrm_reg_mask = 0b00'111'000;
constexpr uint8_t modrm_rm_mask = 0b00'000'111;
constexpr uint8_t modrm_mod_mask = 0b11'000'000;
error_t *encoder_alloc(encoder_t **encoder);
error_t *encoder_encode(encoder_t *encoder, ast_node_t *ast);
error_t *encoder_alloc(encoder_t **encoder, ast_node_t *ast);
error_t *encoder_encode(encoder_t *encoder);
void encoder_free(encoder_t *encoder);
extern error_t *const err_encoder_invalid_register;

22
src/encoder/symbols.c
View File

@ -92,7 +92,7 @@ EXPORT | | | ERR | |
-------------|-----------|----------|----------|----------|
*/
bool symbol_table_should_update(symbol_kind_t old, symbol_kind_t new) {
bool symbol_table_should_upgrade(symbol_kind_t old, symbol_kind_t new) {
if (old == SYMBOL_REFERENCE)
return new != SYMBOL_REFERENCE;
if (old == SYMBOL_LOCAL)
@ -112,7 +112,7 @@ bool symbol_table_should_error(symbol_kind_t old, symbol_kind_t new) {
* @pre The symbol _must not_ already be in the table.
*/
error_t *symbol_table_add(symbol_table_t *table, char *name, symbol_kind_t kind,
ast_node_t *node) {
ast_node_t *statement) {
if (table->len >= table->cap) {
error_t *err = symbol_table_grow_cap(table);
if (err)
@ -122,7 +122,7 @@ error_t *symbol_table_add(symbol_table_t *table, char *name, symbol_kind_t kind,
table->symbols[table->len] = (symbol_t){
.name = name,
.kind = kind,
.node = node,
.statement = statement,
};
table->len += 1;
@ -130,23 +130,29 @@ error_t *symbol_table_add(symbol_table_t *table, char *name, symbol_kind_t kind,
return nullptr;
}
error_t *symbol_table_update(symbol_table_t *table, ast_node_t *node) {
error_t *symbol_table_update(symbol_table_t *table, ast_node_t *node,
ast_node_t *statement) {
char *name;
symbol_kind_t kind;
error_t *err = symbol_table_get_node_info(node, &kind, &name);
if (err)
return err;
if (kind != SYMBOL_LOCAL)
statement = nullptr;
symbol_t *symbol = symbol_table_lookup(table, name);
if (!symbol)
return symbol_table_add(table, name, kind, node);
return symbol_table_add(table, name, kind, statement);
if (symbol_table_should_error(symbol->kind, kind))
return err_symbol_table_incompatible_symbols;
if (symbol_table_should_update(symbol->kind, kind)) {
symbol->name = name;
if (symbol_table_should_upgrade(symbol->kind, kind)) {
symbol->kind = kind;
symbol->node = node;
}
if (kind == SYMBOL_LOCAL && symbol->statement == nullptr)
symbol->statement = statement;
return nullptr;
}

5
src/encoder/symbols.h
View File

@ -29,7 +29,7 @@ typedef enum symbol_kind {
typedef struct symbol {
char *name;
symbol_kind_t kind;
ast_node_t *node;
ast_node_t *statement;
} symbol_t;
typedef struct symbol_table {
@ -40,7 +40,8 @@ typedef struct symbol_table {
error_t *symbol_table_alloc(symbol_table_t **table);
void symbol_table_free(symbol_table_t *table);
error_t *symbol_table_update(symbol_table_t *table, ast_node_t *node);
error_t *symbol_table_update(symbol_table_t *table, ast_node_t *node,
ast_node_t *statement);
symbol_t *symbol_table_lookup(symbol_table_t *table, const char *name);
#endif // INCLUDE_ENCODER_SYMBOLS_H_

7
src/main.c
View File

@ -74,11 +74,11 @@ error_t *print_encoding(tokenlist_t *list) {
return result.err;
encoder_t *encoder;
error_t *err = encoder_alloc(&encoder);
error_t *err = encoder_alloc(&encoder, result.node);
if (err)
goto cleanup_ast;
err = encoder_encode(encoder, result.node);
err = encoder_encode(encoder);
if (err)
goto cleanup_ast;
@ -88,7 +88,8 @@ error_t *print_encoding(tokenlist_t *list) {
if (node->id != NODE_INSTRUCTION)
continue;
print_hex(node->value.encoding.len, node->value.encoding.encoding);
print_hex(node->value.instruction.encoding.len,
node->value.instruction.encoding.buffer);
}
encoder_free(encoder);

3
src/parser/parser.c
View File

@ -89,7 +89,8 @@ parse_result_t parse_immediate(tokenlist_entry_t *current) {
}
parse_result_t parse_memory_expression(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_register_expression, parse_identifier, nullptr};
parser_t parsers[] = {parse_register_expression, parse_label_reference,
nullptr};
return parse_any(current, parsers);
}

140
tests/symbols.c
View File

@ -58,17 +58,19 @@ MunitResult test_symbol_add_reference(const MunitParameter params[], void *data)
symbol_table_alloc(&table);
ast_node_t *reference = root->children[3]->children[1]->children[0]->children[0];
ast_node_t *statement = root->children[3]; // The containing statement
munit_assert_int(reference->id, ==, NODE_LABEL_REFERENCE);
munit_assert_size(table->len, ==, 0);
error_t *err = symbol_table_update(table, reference);
error_t *err = symbol_table_update(table, reference, statement);
munit_assert_null(err);
munit_assert_size(table->len, ==, 1);
symbol_t *symbol = symbol_table_lookup(table, "test");
munit_assert_not_null(symbol);
munit_assert_int(SYMBOL_REFERENCE, ==, symbol->kind);
munit_assert_ptr_equal(reference, symbol->node);
// For references, the statement should be nullptr
munit_assert_ptr_null(symbol->statement);
munit_assert_string_equal(symbol->name, "test");
symbol_table_free(table);
@ -90,14 +92,14 @@ MunitResult test_symbol_add_label(const MunitParameter params[], void *data) {
munit_assert_int(label->id, ==, NODE_LABEL);
munit_assert_size(table->len, ==, 0);
error_t *err = symbol_table_update(table, label);
error_t *err = symbol_table_update(table, label, label);
munit_assert_null(err);
munit_assert_size(table->len, ==, 1);
symbol_t *symbol = symbol_table_lookup(table, "test");
munit_assert_not_null(symbol);
munit_assert_int(SYMBOL_LOCAL, ==, symbol->kind);
munit_assert_ptr_equal(label, symbol->node);
munit_assert_ptr_equal(label, symbol->statement);
munit_assert_string_equal(symbol->name, "test");
symbol_table_free(table);
@ -116,17 +118,19 @@ MunitResult test_symbol_add_import(const MunitParameter params[], void *data) {
symbol_table_alloc(&table);
ast_node_t *import_directive = root->children[0]->children[1];
ast_node_t *statement = root->children[0]; // The containing statement
munit_assert_int(import_directive->id, ==, NODE_IMPORT_DIRECTIVE);
munit_assert_size(table->len, ==, 0);
error_t *err = symbol_table_update(table, import_directive);
error_t *err = symbol_table_update(table, import_directive, statement);
munit_assert_null(err);
munit_assert_size(table->len, ==, 1);
symbol_t *symbol = symbol_table_lookup(table, "test");
munit_assert_not_null(symbol);
munit_assert_int(SYMBOL_IMPORT, ==, symbol->kind);
munit_assert_ptr_equal(import_directive, symbol->node);
// For import directives, the statement should be nullptr
munit_assert_ptr_null(symbol->statement);
munit_assert_string_equal(symbol->name, "test");
symbol_table_free(table);
@ -135,42 +139,56 @@ MunitResult test_symbol_add_import(const MunitParameter params[], void *data) {
return MUNIT_OK;
}
void test_symbol_update(const char *name, ast_node_t *first, symbol_kind_t first_kind, ast_node_t *second,
symbol_kind_t second_kind, bool should_succeed, bool should_update) {
void test_symbol_update(const char *name, ast_node_t *first, symbol_kind_t first_kind, ast_node_t *first_statement,
ast_node_t *second, symbol_kind_t second_kind, ast_node_t *second_statement,
bool should_succeed, bool should_update, ast_node_t *expected_statement) {
symbol_table_t *table = nullptr;
symbol_table_alloc(&table);
munit_assert_size(table->len, ==, 0);
error_t *err = symbol_table_update(table, first);
// Add the first symbol
error_t *err = symbol_table_update(table, first, first_statement);
munit_assert_null(err);
munit_assert_size(table->len, ==, 1);
// Verify first symbol state
symbol_t *symbol = symbol_table_lookup(table, name);
munit_assert_not_null(symbol);
munit_assert_int(first_kind, ==, symbol->kind);
munit_assert_ptr_equal(first, symbol->node);
munit_assert_string_equal(symbol->name, name);
err = symbol_table_update(table, second);
if (should_succeed)
munit_assert_null(err);
else
munit_assert_ptr_equal(err, err_symbol_table_incompatible_symbols);
munit_assert_size(table->len, ==, 1);
symbol = symbol_table_lookup(table, name);
if (should_update) {
munit_assert_not_null(symbol);
munit_assert_int(second_kind, ==, symbol->kind);
munit_assert_ptr_equal(second, symbol->node);
munit_assert_string_equal(symbol->name, name);
// Check statement based on symbol kind
if (first_kind == SYMBOL_LOCAL) {
munit_assert_ptr_equal(first_statement, symbol->statement);
} else {
munit_assert_not_null(symbol);
munit_assert_int(first_kind, ==, symbol->kind);
munit_assert_ptr_equal(first, symbol->node);
munit_assert_string_equal(symbol->name, name);
munit_assert_ptr_null(symbol->statement);
}
// Attempt the second update
err = symbol_table_update(table, second, second_statement);
// Check if update succeeded as expected
if (should_succeed) {
munit_assert_null(err);
} else {
munit_assert_ptr_equal(err, err_symbol_table_incompatible_symbols);
symbol_table_free(table);
return;
}
// Verify symbol after second update
symbol = symbol_table_lookup(table, name);
munit_assert_not_null(symbol);
// Check if kind updated as expected
if (should_update) {
munit_assert_int(second_kind, ==, symbol->kind);
} else {
munit_assert_int(first_kind, ==, symbol->kind);
}
// Simply check against the expected statement value
munit_assert_ptr_equal(expected_statement, symbol->statement);
symbol_table_free(table);
}
@ -181,28 +199,43 @@ MunitResult test_symbol_upgrade_valid(const MunitParameter params[], void *data)
symbols_setup_test(&root, &list, "tests/input/symbols.asm");
ast_node_t *reference = root->children[3]->children[1]->children[0]->children[0];
ast_node_t *reference_statement = root->children[3];
ast_node_t *label = root->children[2];
ast_node_t *import_directive = root->children[0]->children[1];
ast_node_t *import_statement = root->children[0];
ast_node_t *export_directive = root->children[1]->children[1];
ast_node_t *export_statement = root->children[1];
// real upgrades
test_symbol_update("test", reference, SYMBOL_REFERENCE, label, SYMBOL_LOCAL, true, true);
test_symbol_update("test", reference, SYMBOL_REFERENCE, import_directive, SYMBOL_IMPORT, true, true);
test_symbol_update("test", reference, SYMBOL_REFERENCE, export_directive, SYMBOL_EXPORT, true, true);
test_symbol_update("test", label, SYMBOL_LOCAL, export_directive, SYMBOL_EXPORT, true, true);
test_symbol_update("test", reference, SYMBOL_REFERENCE, reference_statement, label, SYMBOL_LOCAL, label, true, true,
label);
test_symbol_update("test", reference, SYMBOL_REFERENCE, reference_statement, import_directive, SYMBOL_IMPORT,
import_statement, true, true, nullptr);
test_symbol_update("test", reference, SYMBOL_REFERENCE, reference_statement, export_directive, SYMBOL_EXPORT,
export_statement, true, true, nullptr);
test_symbol_update("test", label, SYMBOL_LOCAL, label, export_directive, SYMBOL_EXPORT, export_statement, true,
true, label);
// identity upgrades
test_symbol_update("test", reference, SYMBOL_REFERENCE, reference, SYMBOL_REFERENCE, true, false);
test_symbol_update("test", label, SYMBOL_LOCAL, label, SYMBOL_LOCAL, true, false);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, import_directive, SYMBOL_IMPORT, true, false);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, export_directive, SYMBOL_EXPORT, true, false);
test_symbol_update("test", reference, SYMBOL_REFERENCE, reference_statement, reference, SYMBOL_REFERENCE,
reference_statement, true, false, nullptr);
test_symbol_update("test", label, SYMBOL_LOCAL, label, label, SYMBOL_LOCAL, label, true, false, label);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, import_statement, import_directive, SYMBOL_IMPORT,
import_statement, true, false, nullptr);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, export_statement, export_directive, SYMBOL_EXPORT,
export_statement, true, false, nullptr);
// downgrades that are allowed and ignored
test_symbol_update("test", label, SYMBOL_LOCAL, reference, SYMBOL_REFERENCE, true, false);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, reference, SYMBOL_REFERENCE, true, false);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, reference, SYMBOL_REFERENCE, true, false);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, label, SYMBOL_LOCAL, true, false);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, label, SYMBOL_LOCAL, true, false);
test_symbol_update("test", label, SYMBOL_LOCAL, label, reference, SYMBOL_REFERENCE, reference_statement, true,
false, label);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, import_statement, reference, SYMBOL_REFERENCE,
reference_statement, true, false, nullptr);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, export_statement, reference, SYMBOL_REFERENCE,
reference_statement, true, false, nullptr);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, export_statement, label, SYMBOL_LOCAL, label, true,
false, label);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, import_statement, label, SYMBOL_LOCAL, label, true,
false, label);
ast_node_free(root);
tokenlist_free(list);
@ -216,14 +249,20 @@ MunitResult test_symbol_upgrade_invalid(const MunitParameter params[], void *dat
symbols_setup_test(&root, &list, "tests/input/symbols.asm");
ast_node_t *reference = root->children[3]->children[1]->children[0]->children[0];
ast_node_t *reference_statement = root->children[3];
ast_node_t *label = root->children[2];
ast_node_t *import_directive = root->children[0]->children[1];
ast_node_t *import_statement = root->children[0];
ast_node_t *export_directive = root->children[1]->children[1];
ast_node_t *export_statement = root->children[1];
// invalid upgrades
test_symbol_update("test", label, SYMBOL_LOCAL, import_directive, SYMBOL_IMPORT, false, false);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, import_directive, SYMBOL_IMPORT, false, false);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, export_directive, SYMBOL_EXPORT, false, false);
test_symbol_update("test", label, SYMBOL_LOCAL, label, import_directive, SYMBOL_IMPORT, import_statement, false,
false, nullptr);
test_symbol_update("test", export_directive, SYMBOL_EXPORT, export_statement, import_directive, SYMBOL_IMPORT,
import_statement, false, false, nullptr);
test_symbol_update("test", import_directive, SYMBOL_IMPORT, import_statement, export_directive, SYMBOL_EXPORT,
export_statement, false, false, nullptr);
ast_node_free(root);
tokenlist_free(list);
@ -240,17 +279,19 @@ MunitResult test_symbol_add_export(const MunitParameter params[], void *data) {
symbol_table_alloc(&table);
ast_node_t *export_directive = root->children[1]->children[1];
ast_node_t *statement = root->children[1]; // The containing statement
munit_assert_int(export_directive->id, ==, NODE_EXPORT_DIRECTIVE);
munit_assert_size(table->len, ==, 0);
error_t *err = symbol_table_update(table, export_directive);
error_t *err = symbol_table_update(table, export_directive, statement);
munit_assert_null(err);
munit_assert_size(table->len, ==, 1);
symbol_t *symbol = symbol_table_lookup(table, "test");
munit_assert_not_null(symbol);
munit_assert_int(SYMBOL_EXPORT, ==, symbol->kind);
munit_assert_ptr_equal(export_directive, symbol->node);
// For export directives, the statement should be nullptr
munit_assert_ptr_null(symbol->statement);
munit_assert_string_equal(symbol->name, "test");
symbol_table_free(table);
@ -280,7 +321,7 @@ MunitResult test_symbol_table_growth(const MunitParameter params[], void *data)
ast_node_t *label = root->children[i];
munit_assert_int(label->id, ==, NODE_LABEL);
error_t *err = symbol_table_update(table, label);
error_t *err = symbol_table_update(table, label, label);
munit_assert_null(err);
munit_assert_size(table->len, ==, i + 1);
@ -292,7 +333,7 @@ MunitResult test_symbol_table_growth(const MunitParameter params[], void *data)
ast_node_t *final_label = root->children[64];
munit_assert_int(final_label->id, ==, NODE_LABEL);
error_t *err = symbol_table_update(table, final_label);
error_t *err = symbol_table_update(table, final_label, final_label);
munit_assert_null(err);
munit_assert_size(table->len, ==, 65);
@ -308,6 +349,7 @@ MunitResult test_symbol_table_growth(const MunitParameter params[], void *data)
munit_assert_not_null(symbol);
munit_assert_int(SYMBOL_LOCAL, ==, symbol->kind);
munit_assert_string_equal(symbol->name, name);
munit_assert_ptr_equal(symbol->statement, root->children[i]);
}
symbol_table_free(table);
@ -326,7 +368,7 @@ MunitResult test_symbol_invalid_node(const MunitParameter params[], void *data)
symbol_table_alloc(&table);
munit_assert_size(table->len, ==, 0);
error_t *err = symbol_table_update(table, root);
error_t *err = symbol_table_update(table, root, root);
munit_assert_ptr_equal(err, err_symbol_table_invalid_node);
munit_assert_size(table->len, ==, 0);