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analyze.cpp
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analyze.cpp
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/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include "analyze.hpp"
#include "ast_render.hpp"
#include "config.h"
#include "error.hpp"
#include "ir.hpp"
#include "ir_print.hpp"
#include "os.hpp"
#include "parser.hpp"
#include "softfloat.hpp"
#include "zig_llvm.h"
static const size_t default_backward_branch_quota = 1000;
static Error resolve_struct_type(CodeGen *g, ZigType *struct_type);
static Error ATTRIBUTE_MUST_USE resolve_struct_zero_bits(CodeGen *g, ZigType *struct_type);
static Error ATTRIBUTE_MUST_USE resolve_struct_alignment(CodeGen *g, ZigType *struct_type);
static Error ATTRIBUTE_MUST_USE resolve_enum_zero_bits(CodeGen *g, ZigType *enum_type);
static Error ATTRIBUTE_MUST_USE resolve_union_zero_bits(CodeGen *g, ZigType *union_type);
static Error ATTRIBUTE_MUST_USE resolve_union_alignment(CodeGen *g, ZigType *union_type);
static void analyze_fn_body(CodeGen *g, ZigFn *fn_table_entry);
static void resolve_llvm_types(CodeGen *g, ZigType *type, ResolveStatus wanted_resolve_status);
static void preview_use_decl(CodeGen *g, TldUsingNamespace *using_namespace, ScopeDecls *dest_decls_scope);
static void resolve_use_decl(CodeGen *g, TldUsingNamespace *tld_using_namespace, ScopeDecls *dest_decls_scope);
static bool is_top_level_struct(ZigType *import) {
return import->id == ZigTypeIdStruct && import->data.structure.root_struct != nullptr;
}
static ErrorMsg *add_error_note_token(CodeGen *g, ErrorMsg *parent_msg, ZigType *owner, Token *token, Buf *msg) {
assert(is_top_level_struct(owner));
RootStruct *root_struct = owner->data.structure.root_struct;
ErrorMsg *err = err_msg_create_with_line(root_struct->path, token->start_line, token->start_column,
root_struct->source_code, root_struct->line_offsets, msg);
err_msg_add_note(parent_msg, err);
return err;
}
ErrorMsg *add_token_error(CodeGen *g, ZigType *owner, Token *token, Buf *msg) {
assert(is_top_level_struct(owner));
RootStruct *root_struct = owner->data.structure.root_struct;
ErrorMsg *err = err_msg_create_with_line(root_struct->path, token->start_line, token->start_column,
root_struct->source_code, root_struct->line_offsets, msg);
g->errors.append(err);
return err;
}
ErrorMsg *add_node_error(CodeGen *g, AstNode *node, Buf *msg) {
Token fake_token;
fake_token.start_line = node->line;
fake_token.start_column = node->column;
return add_token_error(g, node->owner, &fake_token, msg);
}
ErrorMsg *add_error_note(CodeGen *g, ErrorMsg *parent_msg, AstNode *node, Buf *msg) {
Token fake_token;
fake_token.start_line = node->line;
fake_token.start_column = node->column;
return add_error_note_token(g, parent_msg, node->owner, &fake_token, msg);
}
ZigType *new_type_table_entry(ZigTypeId id) {
ZigType *entry = allocate<ZigType>(1);
entry->id = id;
return entry;
}
static ScopeDecls **get_container_scope_ptr(ZigType *type_entry) {
if (type_entry->id == ZigTypeIdStruct) {
return &type_entry->data.structure.decls_scope;
} else if (type_entry->id == ZigTypeIdEnum) {
return &type_entry->data.enumeration.decls_scope;
} else if (type_entry->id == ZigTypeIdUnion) {
return &type_entry->data.unionation.decls_scope;
}
zig_unreachable();
}
ScopeDecls *get_container_scope(ZigType *type_entry) {
return *get_container_scope_ptr(type_entry);
}
void init_scope(CodeGen *g, Scope *dest, ScopeId id, AstNode *source_node, Scope *parent) {
dest->codegen = g;
dest->id = id;
dest->source_node = source_node;
dest->parent = parent;
}
static ScopeDecls *create_decls_scope(CodeGen *g, AstNode *node, Scope *parent, ZigType *container_type,
ZigType *import, Buf *bare_name)
{
assert(node == nullptr || node->type == NodeTypeContainerDecl || node->type == NodeTypeFnCallExpr);
ScopeDecls *scope = allocate<ScopeDecls>(1);
init_scope(g, &scope->base, ScopeIdDecls, node, parent);
scope->decl_table.init(4);
scope->container_type = container_type;
scope->import = import;
scope->bare_name = bare_name;
return scope;
}
ScopeBlock *create_block_scope(CodeGen *g, AstNode *node, Scope *parent) {
assert(node->type == NodeTypeBlock);
ScopeBlock *scope = allocate<ScopeBlock>(1);
init_scope(g, &scope->base, ScopeIdBlock, node, parent);
scope->name = node->data.block.name;
return scope;
}
ScopeDefer *create_defer_scope(CodeGen *g, AstNode *node, Scope *parent) {
assert(node->type == NodeTypeDefer);
ScopeDefer *scope = allocate<ScopeDefer>(1);
init_scope(g, &scope->base, ScopeIdDefer, node, parent);
return scope;
}
ScopeDeferExpr *create_defer_expr_scope(CodeGen *g, AstNode *node, Scope *parent) {
assert(node->type == NodeTypeDefer);
ScopeDeferExpr *scope = allocate<ScopeDeferExpr>(1);
init_scope(g, &scope->base, ScopeIdDeferExpr, node, parent);
return scope;
}
Scope *create_var_scope(CodeGen *g, AstNode *node, Scope *parent, ZigVar *var) {
ScopeVarDecl *scope = allocate<ScopeVarDecl>(1);
init_scope(g, &scope->base, ScopeIdVarDecl, node, parent);
scope->var = var;
return &scope->base;
}
ScopeCImport *create_cimport_scope(CodeGen *g, AstNode *node, Scope *parent) {
assert(node->type == NodeTypeFnCallExpr);
ScopeCImport *scope = allocate<ScopeCImport>(1);
init_scope(g, &scope->base, ScopeIdCImport, node, parent);
buf_resize(&scope->buf, 0);
return scope;
}
ScopeLoop *create_loop_scope(CodeGen *g, AstNode *node, Scope *parent) {
ScopeLoop *scope = allocate<ScopeLoop>(1);
init_scope(g, &scope->base, ScopeIdLoop, node, parent);
if (node->type == NodeTypeWhileExpr) {
scope->name = node->data.while_expr.name;
} else if (node->type == NodeTypeForExpr) {
scope->name = node->data.for_expr.name;
} else {
zig_unreachable();
}
return scope;
}
Scope *create_runtime_scope(CodeGen *g, AstNode *node, Scope *parent, IrInstruction *is_comptime) {
ScopeRuntime *scope = allocate<ScopeRuntime>(1);
scope->is_comptime = is_comptime;
init_scope(g, &scope->base, ScopeIdRuntime, node, parent);
return &scope->base;
}
ScopeSuspend *create_suspend_scope(CodeGen *g, AstNode *node, Scope *parent) {
assert(node->type == NodeTypeSuspend);
ScopeSuspend *scope = allocate<ScopeSuspend>(1);
init_scope(g, &scope->base, ScopeIdSuspend, node, parent);
return scope;
}
ScopeFnDef *create_fndef_scope(CodeGen *g, AstNode *node, Scope *parent, ZigFn *fn_entry) {
ScopeFnDef *scope = allocate<ScopeFnDef>(1);
init_scope(g, &scope->base, ScopeIdFnDef, node, parent);
scope->fn_entry = fn_entry;
return scope;
}
Scope *create_comptime_scope(CodeGen *g, AstNode *node, Scope *parent) {
ScopeCompTime *scope = allocate<ScopeCompTime>(1);
init_scope(g, &scope->base, ScopeIdCompTime, node, parent);
return &scope->base;
}
Scope *create_coro_prelude_scope(CodeGen *g, AstNode *node, Scope *parent) {
ScopeCoroPrelude *scope = allocate<ScopeCoroPrelude>(1);
init_scope(g, &scope->base, ScopeIdCoroPrelude, node, parent);
return &scope->base;
}
ZigType *get_scope_import(Scope *scope) {
while (scope) {
if (scope->id == ScopeIdDecls) {
ScopeDecls *decls_scope = (ScopeDecls *)scope;
assert(is_top_level_struct(decls_scope->import));
return decls_scope->import;
}
scope = scope->parent;
}
zig_unreachable();
}
static ZigType *new_container_type_entry(CodeGen *g, ZigTypeId id, AstNode *source_node, Scope *parent_scope,
Buf *bare_name)
{
ZigType *entry = new_type_table_entry(id);
*get_container_scope_ptr(entry) = create_decls_scope(g, source_node, parent_scope, entry,
get_scope_import(parent_scope), bare_name);
return entry;
}
static uint8_t bits_needed_for_unsigned(uint64_t x) {
if (x == 0) {
return 0;
}
uint8_t base = log2_u64(x);
uint64_t upper = (((uint64_t)1) << base) - 1;
return (upper >= x) ? base : (base + 1);
}
AstNode *type_decl_node(ZigType *type_entry) {
switch (type_entry->id) {
case ZigTypeIdInvalid:
zig_unreachable();
case ZigTypeIdStruct:
return type_entry->data.structure.decl_node;
case ZigTypeIdEnum:
return type_entry->data.enumeration.decl_node;
case ZigTypeIdUnion:
return type_entry->data.unionation.decl_node;
case ZigTypeIdOpaque:
case ZigTypeIdMetaType:
case ZigTypeIdVoid:
case ZigTypeIdBool:
case ZigTypeIdUnreachable:
case ZigTypeIdInt:
case ZigTypeIdFloat:
case ZigTypeIdPointer:
case ZigTypeIdArray:
case ZigTypeIdComptimeFloat:
case ZigTypeIdComptimeInt:
case ZigTypeIdEnumLiteral:
case ZigTypeIdUndefined:
case ZigTypeIdNull:
case ZigTypeIdOptional:
case ZigTypeIdErrorUnion:
case ZigTypeIdErrorSet:
case ZigTypeIdFn:
case ZigTypeIdBoundFn:
case ZigTypeIdArgTuple:
case ZigTypeIdPromise:
case ZigTypeIdVector:
return nullptr;
}
zig_unreachable();
}
bool type_is_resolved(ZigType *type_entry, ResolveStatus status) {
switch (type_entry->id) {
case ZigTypeIdInvalid:
zig_unreachable();
case ZigTypeIdStruct:
return type_entry->data.structure.resolve_status >= status;
case ZigTypeIdUnion:
return type_entry->data.unionation.resolve_status >= status;
case ZigTypeIdEnum:
switch (status) {
case ResolveStatusUnstarted:
return true;
case ResolveStatusInvalid:
zig_unreachable();
case ResolveStatusZeroBitsKnown:
return type_entry->data.enumeration.zero_bits_known;
case ResolveStatusAlignmentKnown:
return type_entry->data.enumeration.zero_bits_known;
case ResolveStatusSizeKnown:
return type_entry->data.enumeration.complete;
case ResolveStatusLLVMFwdDecl:
case ResolveStatusLLVMFull:
return type_entry->llvm_di_type != nullptr;
}
zig_unreachable();
case ZigTypeIdOpaque:
return status < ResolveStatusSizeKnown;
case ZigTypeIdMetaType:
case ZigTypeIdVoid:
case ZigTypeIdBool:
case ZigTypeIdUnreachable:
case ZigTypeIdInt:
case ZigTypeIdFloat:
case ZigTypeIdPointer:
case ZigTypeIdArray:
case ZigTypeIdComptimeFloat:
case ZigTypeIdComptimeInt:
case ZigTypeIdEnumLiteral:
case ZigTypeIdUndefined:
case ZigTypeIdNull:
case ZigTypeIdOptional:
case ZigTypeIdErrorUnion:
case ZigTypeIdErrorSet:
case ZigTypeIdFn:
case ZigTypeIdBoundFn:
case ZigTypeIdArgTuple:
case ZigTypeIdPromise:
case ZigTypeIdVector:
return true;
}
zig_unreachable();
}
bool type_is_complete(ZigType *type_entry) {
return type_is_resolved(type_entry, ResolveStatusSizeKnown);
}
uint64_t type_size(CodeGen *g, ZigType *type_entry) {
assert(type_is_resolved(type_entry, ResolveStatusSizeKnown));
return type_entry->abi_size;
}
uint64_t type_size_bits(CodeGen *g, ZigType *type_entry) {
assert(type_is_resolved(type_entry, ResolveStatusSizeKnown));
return type_entry->size_in_bits;
}
uint32_t get_abi_alignment(CodeGen *g, ZigType *type_entry) {
assert(type_is_resolved(type_entry, ResolveStatusAlignmentKnown));
return type_entry->abi_align;
}
static bool is_slice(ZigType *type) {
return type->id == ZigTypeIdStruct && type->data.structure.is_slice;
}
ZigType *get_smallest_unsigned_int_type(CodeGen *g, uint64_t x) {
return get_int_type(g, false, bits_needed_for_unsigned(x));
}
ZigType *get_promise_type(CodeGen *g, ZigType *result_type) {
if (result_type != nullptr && result_type->promise_parent != nullptr) {
return result_type->promise_parent;
} else if (result_type == nullptr && g->builtin_types.entry_promise != nullptr) {
return g->builtin_types.entry_promise;
}
ZigType *entry = new_type_table_entry(ZigTypeIdPromise);
entry->abi_size = g->builtin_types.entry_usize->abi_size;
entry->size_in_bits = g->builtin_types.entry_usize->size_in_bits;
entry->abi_align = g->builtin_types.entry_usize->abi_align;
entry->data.promise.result_type = result_type;
buf_init_from_str(&entry->name, "promise");
if (result_type != nullptr) {
buf_appendf(&entry->name, "->%s", buf_ptr(&result_type->name));
}
if (result_type != nullptr) {
result_type->promise_parent = entry;
} else if (result_type == nullptr) {
g->builtin_types.entry_promise = entry;
}
return entry;
}
static const char *ptr_len_to_star_str(PtrLen ptr_len) {
switch (ptr_len) {
case PtrLenSingle:
return "*";
case PtrLenUnknown:
return "[*]";
case PtrLenC:
return "[*c]";
}
zig_unreachable();
}
ZigType *get_pointer_to_type_extra(CodeGen *g, ZigType *child_type, bool is_const,
bool is_volatile, PtrLen ptr_len, uint32_t byte_alignment,
uint32_t bit_offset_in_host, uint32_t host_int_bytes, bool allow_zero)
{
assert(ptr_len != PtrLenC || allow_zero);
assert(!type_is_invalid(child_type));
assert(ptr_len == PtrLenSingle || child_type->id != ZigTypeIdOpaque);
if (byte_alignment != 0) {
uint32_t abi_alignment = get_abi_alignment(g, child_type);
if (byte_alignment == abi_alignment)
byte_alignment = 0;
}
if (host_int_bytes != 0) {
uint32_t child_type_bits = type_size_bits(g, child_type);
if (host_int_bytes * 8 == child_type_bits) {
assert(bit_offset_in_host == 0);
host_int_bytes = 0;
}
}
TypeId type_id = {};
ZigType **parent_pointer = nullptr;
if (host_int_bytes != 0 || is_volatile || byte_alignment != 0 || ptr_len != PtrLenSingle || allow_zero) {
type_id.id = ZigTypeIdPointer;
type_id.data.pointer.child_type = child_type;
type_id.data.pointer.is_const = is_const;
type_id.data.pointer.is_volatile = is_volatile;
type_id.data.pointer.alignment = byte_alignment;
type_id.data.pointer.bit_offset_in_host = bit_offset_in_host;
type_id.data.pointer.host_int_bytes = host_int_bytes;
type_id.data.pointer.ptr_len = ptr_len;
type_id.data.pointer.allow_zero = allow_zero;
auto existing_entry = g->type_table.maybe_get(type_id);
if (existing_entry)
return existing_entry->value;
} else {
assert(bit_offset_in_host == 0);
parent_pointer = &child_type->pointer_parent[(is_const ? 1 : 0)];
if (*parent_pointer) {
assert((*parent_pointer)->data.pointer.explicit_alignment == 0);
return *parent_pointer;
}
}
assert(type_is_resolved(child_type, ResolveStatusZeroBitsKnown));
ZigType *entry = new_type_table_entry(ZigTypeIdPointer);
const char *star_str = ptr_len_to_star_str(ptr_len);
const char *const_str = is_const ? "const " : "";
const char *volatile_str = is_volatile ? "volatile " : "";
const char *allow_zero_str;
if (ptr_len == PtrLenC) {
assert(allow_zero);
allow_zero_str = "";
} else {
allow_zero_str = allow_zero ? "allowzero " : "";
}
buf_resize(&entry->name, 0);
if (host_int_bytes == 0 && byte_alignment == 0) {
buf_appendf(&entry->name, "%s%s%s%s%s",
star_str, const_str, volatile_str, allow_zero_str, buf_ptr(&child_type->name));
} else if (host_int_bytes == 0) {
buf_appendf(&entry->name, "%salign(%" PRIu32 ") %s%s%s%s", star_str, byte_alignment,
const_str, volatile_str, allow_zero_str, buf_ptr(&child_type->name));
} else if (byte_alignment == 0) {
buf_appendf(&entry->name, "%salign(:%" PRIu32 ":%" PRIu32 ") %s%s%s%s", star_str,
bit_offset_in_host, host_int_bytes, const_str, volatile_str, allow_zero_str,
buf_ptr(&child_type->name));
} else {
buf_appendf(&entry->name, "%salign(%" PRIu32 ":%" PRIu32 ":%" PRIu32 ") %s%s%s%s", star_str, byte_alignment,
bit_offset_in_host, host_int_bytes, const_str, volatile_str, allow_zero_str,
buf_ptr(&child_type->name));
}
assert(child_type->id != ZigTypeIdInvalid);
if (type_has_bits(child_type)) {
entry->abi_size = g->builtin_types.entry_usize->abi_size;
entry->size_in_bits = g->builtin_types.entry_usize->size_in_bits;
entry->abi_align = g->builtin_types.entry_usize->abi_align;
} else {
assert(byte_alignment == 0);
entry->abi_size = 0;
entry->size_in_bits = 0;
entry->abi_align = 0;
}
entry->data.pointer.ptr_len = ptr_len;
entry->data.pointer.child_type = child_type;
entry->data.pointer.is_const = is_const;
entry->data.pointer.is_volatile = is_volatile;
entry->data.pointer.explicit_alignment = byte_alignment;
entry->data.pointer.bit_offset_in_host = bit_offset_in_host;
entry->data.pointer.host_int_bytes = host_int_bytes;
entry->data.pointer.allow_zero = allow_zero;
if (parent_pointer) {
*parent_pointer = entry;
} else {
g->type_table.put(type_id, entry);
}
return entry;
}
ZigType *get_pointer_to_type(CodeGen *g, ZigType *child_type, bool is_const) {
return get_pointer_to_type_extra(g, child_type, is_const, false, PtrLenSingle, 0, 0, 0, false);
}
ZigType *get_promise_frame_type(CodeGen *g, ZigType *return_type) {
if (return_type->promise_frame_parent != nullptr) {
return return_type->promise_frame_parent;
}
ZigType *atomic_state_type = g->builtin_types.entry_usize;
ZigType *result_ptr_type = get_pointer_to_type(g, return_type, false);
ZigList<const char *> field_names = {};
field_names.append(ATOMIC_STATE_FIELD_NAME);
field_names.append(RESULT_FIELD_NAME);
field_names.append(RESULT_PTR_FIELD_NAME);
if (g->have_err_ret_tracing) {
field_names.append(ERR_RET_TRACE_PTR_FIELD_NAME);
field_names.append(ERR_RET_TRACE_FIELD_NAME);
field_names.append(RETURN_ADDRESSES_FIELD_NAME);
}
ZigList<ZigType *> field_types = {};
field_types.append(atomic_state_type);
field_types.append(return_type);
field_types.append(result_ptr_type);
if (g->have_err_ret_tracing) {
field_types.append(get_ptr_to_stack_trace_type(g));
field_types.append(g->stack_trace_type);
field_types.append(get_array_type(g, g->builtin_types.entry_usize, stack_trace_ptr_count));
}
assert(field_names.length == field_types.length);
Buf *name = buf_sprintf("AsyncFramePromise(%s)", buf_ptr(&return_type->name));
ZigType *entry = get_struct_type(g, buf_ptr(name), field_names.items, field_types.items, field_names.length);
return_type->promise_frame_parent = entry;
return entry;
}
ZigType *get_optional_type(CodeGen *g, ZigType *child_type) {
if (child_type->optional_parent != nullptr) {
return child_type->optional_parent;
}
assert(type_is_resolved(child_type, ResolveStatusSizeKnown));
ZigType *entry = new_type_table_entry(ZigTypeIdOptional);
buf_resize(&entry->name, 0);
buf_appendf(&entry->name, "?%s", buf_ptr(&child_type->name));
if (!type_has_bits(child_type)) {
entry->size_in_bits = g->builtin_types.entry_bool->size_in_bits;
entry->abi_size = g->builtin_types.entry_bool->abi_size;
entry->abi_align = g->builtin_types.entry_bool->abi_align;
} else if (type_is_nonnull_ptr(child_type) || child_type->id == ZigTypeIdErrorSet) {
// This is an optimization but also is necessary for calling C
// functions where all pointers are optional pointers.
// Function types are technically pointers.
entry->size_in_bits = child_type->size_in_bits;
entry->abi_size = child_type->abi_size;
entry->abi_align = child_type->abi_align;
} else {
// This value only matters if the type is legal in a packed struct, which is not
// true for optional types which did not fit the above 2 categories (zero bit child type,
// or nonnull ptr child type, or error set child type).
entry->size_in_bits = child_type->size_in_bits + 1;
// We're going to make a struct with the child type as the first field,
// and a bool as the second. Since the child type's abi alignment is guaranteed
// to be >= the bool's abi size (1 byte), the added size is exactly equal to the
// child type's ABI alignment.
assert(child_type->abi_align >= g->builtin_types.entry_bool->abi_size);
entry->abi_align = child_type->abi_align;
entry->abi_size = child_type->abi_size + child_type->abi_align;
}
entry->data.maybe.child_type = child_type;
child_type->optional_parent = entry;
return entry;
}
static size_t align_forward(size_t addr, size_t alignment) {
return (addr + alignment - 1) & ~(alignment - 1);
}
static size_t next_field_offset(size_t offset, size_t align_from_zero, size_t field_size, size_t next_field_align) {
// Convert offset to a pretend address which has the specified alignment.
size_t addr = offset + align_from_zero;
// March the address forward to respect the field alignment.
size_t aligned_addr = align_forward(addr + field_size, next_field_align);
// Convert back from pretend address to offset.
return aligned_addr - align_from_zero;
}
ZigType *get_error_union_type(CodeGen *g, ZigType *err_set_type, ZigType *payload_type) {
assert(err_set_type->id == ZigTypeIdErrorSet);
assert(!type_is_invalid(payload_type));
TypeId type_id = {};
type_id.id = ZigTypeIdErrorUnion;
type_id.data.error_union.err_set_type = err_set_type;
type_id.data.error_union.payload_type = payload_type;
auto existing_entry = g->type_table.maybe_get(type_id);
if (existing_entry) {
return existing_entry->value;
}
ZigType *entry = new_type_table_entry(ZigTypeIdErrorUnion);
assert(type_is_resolved(payload_type, ResolveStatusSizeKnown));
buf_resize(&entry->name, 0);
buf_appendf(&entry->name, "%s!%s", buf_ptr(&err_set_type->name), buf_ptr(&payload_type->name));
entry->data.error_union.err_set_type = err_set_type;
entry->data.error_union.payload_type = payload_type;
if (!type_has_bits(payload_type)) {
if (type_has_bits(err_set_type)) {
entry->size_in_bits = err_set_type->size_in_bits;
entry->abi_size = err_set_type->abi_size;
entry->abi_align = err_set_type->abi_align;
} else {
entry->size_in_bits = 0;
entry->abi_size = 0;
entry->abi_align = 0;
}
} else if (!type_has_bits(err_set_type)) {
entry->size_in_bits = payload_type->size_in_bits;
entry->abi_size = payload_type->abi_size;
entry->abi_align = payload_type->abi_align;
} else {
entry->abi_align = max(err_set_type->abi_align, payload_type->abi_align);
size_t field_sizes[2];
size_t field_aligns[2];
field_sizes[err_union_err_index] = err_set_type->abi_size;
field_aligns[err_union_err_index] = err_set_type->abi_align;
field_sizes[err_union_payload_index] = payload_type->abi_size;
field_aligns[err_union_payload_index] = payload_type->abi_align;
size_t field2_offset = next_field_offset(0, entry->abi_align, field_sizes[0], field_aligns[1]);
entry->abi_size = next_field_offset(field2_offset, entry->abi_align, field_sizes[1], entry->abi_align);
entry->size_in_bits = entry->abi_size * 8;
}
g->type_table.put(type_id, entry);
return entry;
}
ZigType *get_array_type(CodeGen *g, ZigType *child_type, uint64_t array_size) {
TypeId type_id = {};
type_id.id = ZigTypeIdArray;
type_id.data.array.child_type = child_type;
type_id.data.array.size = array_size;
auto existing_entry = g->type_table.maybe_get(type_id);
if (existing_entry) {
return existing_entry->value;
}
assert(type_is_resolved(child_type, ResolveStatusSizeKnown));
ZigType *entry = new_type_table_entry(ZigTypeIdArray);
buf_resize(&entry->name, 0);
buf_appendf(&entry->name, "[%" ZIG_PRI_u64 "]%s", array_size, buf_ptr(&child_type->name));
entry->size_in_bits = child_type->size_in_bits * array_size;
entry->abi_align = child_type->abi_align;
entry->abi_size = child_type->abi_size * array_size;
entry->data.array.child_type = child_type;
entry->data.array.len = array_size;
g->type_table.put(type_id, entry);
return entry;
}
ZigType *get_slice_type(CodeGen *g, ZigType *ptr_type) {
assert(ptr_type->id == ZigTypeIdPointer);
assert(ptr_type->data.pointer.ptr_len == PtrLenUnknown);
ZigType **parent_pointer = &ptr_type->data.pointer.slice_parent;
if (*parent_pointer) {
return *parent_pointer;
}
ZigType *entry = new_type_table_entry(ZigTypeIdStruct);
// replace the & with [] to go from a ptr type name to a slice type name
buf_resize(&entry->name, 0);
size_t name_offset = (ptr_type->data.pointer.ptr_len == PtrLenSingle) ? 1 : 3;
buf_appendf(&entry->name, "[]%s", buf_ptr(&ptr_type->name) + name_offset);
unsigned element_count = 2;
Buf *ptr_field_name = buf_create_from_str("ptr");
Buf *len_field_name = buf_create_from_str("len");
entry->data.structure.resolve_status = ResolveStatusSizeKnown;
entry->data.structure.layout = ContainerLayoutAuto;
entry->data.structure.is_slice = true;
entry->data.structure.src_field_count = element_count;
entry->data.structure.gen_field_count = element_count;
entry->data.structure.fields = allocate<TypeStructField>(element_count);
entry->data.structure.fields_by_name.init(element_count);
entry->data.structure.fields[slice_ptr_index].name = ptr_field_name;
entry->data.structure.fields[slice_ptr_index].type_entry = ptr_type;
entry->data.structure.fields[slice_ptr_index].src_index = slice_ptr_index;
entry->data.structure.fields[slice_ptr_index].gen_index = 0;
entry->data.structure.fields[slice_len_index].name = len_field_name;
entry->data.structure.fields[slice_len_index].type_entry = g->builtin_types.entry_usize;
entry->data.structure.fields[slice_len_index].src_index = slice_len_index;
entry->data.structure.fields[slice_len_index].gen_index = 1;
entry->data.structure.fields_by_name.put(ptr_field_name, &entry->data.structure.fields[slice_ptr_index]);
entry->data.structure.fields_by_name.put(len_field_name, &entry->data.structure.fields[slice_len_index]);
switch (type_requires_comptime(g, ptr_type)) {
case ReqCompTimeInvalid:
zig_unreachable();
case ReqCompTimeNo:
break;
case ReqCompTimeYes:
entry->data.structure.requires_comptime = true;
}
if (!type_has_bits(ptr_type)) {
entry->data.structure.gen_field_count = 1;
entry->data.structure.fields[slice_ptr_index].gen_index = SIZE_MAX;
entry->data.structure.fields[slice_len_index].gen_index = 0;
}
ZigType *child_type = ptr_type->data.pointer.child_type;
if (ptr_type->data.pointer.is_const || ptr_type->data.pointer.is_volatile ||
ptr_type->data.pointer.explicit_alignment != 0 || ptr_type->data.pointer.allow_zero)
{
ZigType *peer_ptr_type = get_pointer_to_type_extra(g, child_type, false, false,
PtrLenUnknown, 0, 0, 0, false);
ZigType *peer_slice_type = get_slice_type(g, peer_ptr_type);
entry->size_in_bits = peer_slice_type->size_in_bits;
entry->abi_size = peer_slice_type->abi_size;
entry->abi_align = peer_slice_type->abi_align;
*parent_pointer = entry;
return entry;
}
if (type_has_bits(ptr_type)) {
entry->size_in_bits = ptr_type->size_in_bits + g->builtin_types.entry_usize->size_in_bits;
entry->abi_size = ptr_type->abi_size + g->builtin_types.entry_usize->abi_size;
entry->abi_align = ptr_type->abi_align;
} else {
entry->size_in_bits = g->builtin_types.entry_usize->size_in_bits;
entry->abi_size = g->builtin_types.entry_usize->abi_size;
entry->abi_align = g->builtin_types.entry_usize->abi_align;
}
*parent_pointer = entry;
return entry;
}
ZigType *get_opaque_type(CodeGen *g, Scope *scope, AstNode *source_node, const char *full_name, Buf *bare_name) {
ZigType *entry = new_type_table_entry(ZigTypeIdOpaque);
buf_init_from_str(&entry->name, full_name);
ZigType *import = scope ? get_scope_import(scope) : nullptr;
unsigned line = source_node ? (unsigned)(source_node->line + 1) : 0;
entry->llvm_type = LLVMInt8Type();
entry->llvm_di_type = ZigLLVMCreateDebugForwardDeclType(g->dbuilder,
ZigLLVMTag_DW_structure_type(), full_name,
import ? ZigLLVMFileToScope(import->data.structure.root_struct->di_file) : nullptr,
import ? import->data.structure.root_struct->di_file : nullptr,
line);
entry->data.opaque.bare_name = bare_name;
// The actual size is unknown, but the value must not be 0 because that
// is how type_has_bits is determined.
entry->abi_size = SIZE_MAX;
entry->size_in_bits = SIZE_MAX;
entry->abi_align = 1;
return entry;
}
ZigType *get_bound_fn_type(CodeGen *g, ZigFn *fn_entry) {
ZigType *fn_type = fn_entry->type_entry;
assert(fn_type->id == ZigTypeIdFn);
if (fn_type->data.fn.bound_fn_parent)
return fn_type->data.fn.bound_fn_parent;
ZigType *bound_fn_type = new_type_table_entry(ZigTypeIdBoundFn);
bound_fn_type->data.bound_fn.fn_type = fn_type;
buf_resize(&bound_fn_type->name, 0);
buf_appendf(&bound_fn_type->name, "(bound %s)", buf_ptr(&fn_type->name));
fn_type->data.fn.bound_fn_parent = bound_fn_type;
return bound_fn_type;
}
const char *calling_convention_name(CallingConvention cc) {
switch (cc) {
case CallingConventionUnspecified: return "undefined";
case CallingConventionC: return "ccc";
case CallingConventionCold: return "coldcc";
case CallingConventionNaked: return "nakedcc";
case CallingConventionStdcall: return "stdcallcc";
case CallingConventionAsync: return "async";
}
zig_unreachable();
}
static const char *calling_convention_fn_type_str(CallingConvention cc) {
switch (cc) {
case CallingConventionUnspecified: return "";
case CallingConventionC: return "extern ";
case CallingConventionCold: return "coldcc ";
case CallingConventionNaked: return "nakedcc ";
case CallingConventionStdcall: return "stdcallcc ";
case CallingConventionAsync: return "async ";
}
zig_unreachable();
}
bool calling_convention_allows_zig_types(CallingConvention cc) {
switch (cc) {
case CallingConventionUnspecified:
case CallingConventionAsync:
return true;
case CallingConventionC:
case CallingConventionCold:
case CallingConventionNaked:
case CallingConventionStdcall:
return false;
}
zig_unreachable();
}
ZigType *get_ptr_to_stack_trace_type(CodeGen *g) {
if (g->stack_trace_type == nullptr) {
ConstExprValue *stack_trace_type_val = get_builtin_value(g, "StackTrace");
assert(stack_trace_type_val->type->id == ZigTypeIdMetaType);
g->stack_trace_type = stack_trace_type_val->data.x_type;
assertNoError(type_resolve(g, g->stack_trace_type, ResolveStatusZeroBitsKnown));
g->ptr_to_stack_trace_type = get_pointer_to_type(g, g->stack_trace_type, false);
}
return g->ptr_to_stack_trace_type;
}
bool want_first_arg_sret(CodeGen *g, FnTypeId *fn_type_id) {
if (fn_type_id->cc == CallingConventionUnspecified) {
return handle_is_ptr(fn_type_id->return_type);
}
if (fn_type_id->cc != CallingConventionC) {
return false;
}
if (type_is_c_abi_int(g, fn_type_id->return_type)) {
return false;
}
if (g->zig_target->arch == ZigLLVM_x86_64) {
X64CABIClass abi_class = type_c_abi_x86_64_class(g, fn_type_id->return_type);
return abi_class == X64CABIClass_MEMORY;
} else if (target_is_arm(g->zig_target)) {
return type_size(g, fn_type_id->return_type) > 16;
}
zig_panic("TODO implement C ABI for this architecture. See https://github.com/ziglang/zig/issues/1481");
}
ZigType *get_fn_type(CodeGen *g, FnTypeId *fn_type_id) {
Error err;
auto table_entry = g->fn_type_table.maybe_get(fn_type_id);
if (table_entry) {
return table_entry->value;
}
if (fn_type_id->return_type != nullptr) {
if ((err = ensure_complete_type(g, fn_type_id->return_type)))
return g->builtin_types.entry_invalid;
assert(fn_type_id->return_type->id != ZigTypeIdOpaque);
} else {
zig_panic("TODO implement inferred return types https://github.com/ziglang/zig/issues/447");
}
ZigType *fn_type = new_type_table_entry(ZigTypeIdFn);
fn_type->data.fn.fn_type_id = *fn_type_id;
// populate the name of the type
buf_resize(&fn_type->name, 0);
if (fn_type->data.fn.fn_type_id.cc == CallingConventionAsync) {
assert(fn_type_id->async_allocator_type != nullptr);
buf_appendf(&fn_type->name, "async<%s> ", buf_ptr(&fn_type_id->async_allocator_type->name));
} else {
const char *cc_str = calling_convention_fn_type_str(fn_type->data.fn.fn_type_id.cc);
buf_appendf(&fn_type->name, "%s", cc_str);
}
buf_appendf(&fn_type->name, "fn(");
for (size_t i = 0; i < fn_type_id->param_count; i += 1) {
FnTypeParamInfo *param_info = &fn_type_id->param_info[i];
ZigType *param_type = param_info->type;
const char *comma = (i == 0) ? "" : ", ";
const char *noalias_str = param_info->is_noalias ? "noalias " : "";
buf_appendf(&fn_type->name, "%s%s%s", comma, noalias_str, buf_ptr(¶m_type->name));
}
if (fn_type_id->is_var_args) {
const char *comma = (fn_type_id->param_count == 0) ? "" : ", ";
buf_appendf(&fn_type->name, "%s...", comma);
}
buf_appendf(&fn_type->name, ")");
if (fn_type_id->alignment != 0) {
buf_appendf(&fn_type->name, " align(%" PRIu32 ")", fn_type_id->alignment);
}
buf_appendf(&fn_type->name, " %s", buf_ptr(&fn_type_id->return_type->name));
// The fn_type is a pointer; not to be confused with the raw function type.
fn_type->size_in_bits = g->builtin_types.entry_usize->size_in_bits;
fn_type->abi_size = g->builtin_types.entry_usize->abi_size;
fn_type->abi_align = g->builtin_types.entry_usize->abi_align;
g->fn_type_table.put(&fn_type->data.fn.fn_type_id, fn_type);
return fn_type;
}
static ZigTypeId container_to_type(ContainerKind kind) {
switch (kind) {
case ContainerKindStruct:
return ZigTypeIdStruct;
case ContainerKindEnum:
return ZigTypeIdEnum;
case ContainerKindUnion:
return ZigTypeIdUnion;
}
zig_unreachable();
}
// This is like get_partial_container_type except it's for the implicit root struct of files.
static ZigType *get_root_container_type(CodeGen *g, const char *full_name, Buf *bare_name,
RootStruct *root_struct)
{
ZigType *entry = new_type_table_entry(ZigTypeIdStruct);
entry->data.structure.decls_scope = create_decls_scope(g, nullptr, nullptr, entry, entry, bare_name);
entry->data.structure.root_struct = root_struct;
entry->data.structure.layout = ContainerLayoutAuto;
buf_init_from_str(&entry->name, full_name);
return entry;
}
ZigType *get_partial_container_type(CodeGen *g, Scope *scope, ContainerKind kind,
AstNode *decl_node, const char *full_name, Buf *bare_name, ContainerLayout layout)
{
ZigTypeId type_id = container_to_type(kind);
ZigType *entry = new_container_type_entry(g, type_id, decl_node, scope, bare_name);
switch (kind) {
case ContainerKindStruct:
entry->data.structure.decl_node = decl_node;
entry->data.structure.layout = layout;
break;
case ContainerKindEnum:
entry->data.enumeration.decl_node = decl_node;
entry->data.enumeration.layout = layout;
break;
case ContainerKindUnion:
entry->data.unionation.decl_node = decl_node;
entry->data.unionation.layout = layout;
break;
}
buf_init_from_str(&entry->name, full_name);
return entry;
}
ConstExprValue *analyze_const_value(CodeGen *g, Scope *scope, AstNode *node, ZigType *type_entry, Buf *type_name) {
size_t backward_branch_count = 0;
size_t backward_branch_quota = default_backward_branch_quota;
return ir_eval_const_value(g, scope, node, type_entry,
&backward_branch_count, &backward_branch_quota,
nullptr, nullptr, node, type_name, nullptr, nullptr);
}
ZigType *analyze_type_expr(CodeGen *g, Scope *scope, AstNode *node) {
ConstExprValue *result = analyze_const_value(g, scope, node, g->builtin_types.entry_type, nullptr);
if (type_is_invalid(result->type))
return g->builtin_types.entry_invalid;
assert(result->special != ConstValSpecialRuntime);
// Reject undefined as valid `type` type even though the specification
// allows it to be casted to anything.
// See also ir_resolve_type()
if (result->special == ConstValSpecialUndef) {
add_node_error(g, node,
buf_sprintf("expected type 'type', found '%s'",
buf_ptr(&g->builtin_types.entry_undef->name)));
return g->builtin_types.entry_invalid;
}
assert(result->data.x_type != nullptr);
return result->data.x_type;
}
ZigType *get_generic_fn_type(CodeGen *g, FnTypeId *fn_type_id) {
ZigType *fn_type = new_type_table_entry(ZigTypeIdFn);
buf_resize(&fn_type->name, 0);