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parsec: cleaner shifting code for fixed size types

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This commit is contained in:
Andrew Kelley
2017-09-20 22:44:24 -04:00
parent a5e4e205c8
commit 9cdb5dec7a
4 changed files with 76 additions and 6 deletions
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51
src/parsec.cpp
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@@ -347,9 +347,60 @@ static AstNode* trans_c_cast(Context *c, const SourceLocation &source_location,
return trans_create_node_fn_call_1(c, trans_qual_type(c, qt, source_location), expr);
}
static uint32_t qual_type_int_bit_width(Context *c, const QualType &qt, const SourceLocation &source_loc) {
const Type *ty = qt.getTypePtr();
switch (ty->getTypeClass()) {
case Type::Builtin:
{
const BuiltinType *builtin_ty = static_cast<const BuiltinType*>(ty);
switch (builtin_ty->getKind()) {
case BuiltinType::Char_U:
case BuiltinType::UChar:
case BuiltinType::Char_S:
case BuiltinType::SChar:
return 8;
case BuiltinType::UInt128:
case BuiltinType::Int128:
return 128;
default:
return 0;
}
zig_unreachable();
}
case Type::Typedef:
{
const TypedefType *typedef_ty = static_cast<const TypedefType*>(ty);
const TypedefNameDecl *typedef_decl = typedef_ty->getDecl();
const char *type_name = decl_name(typedef_decl);
if (strcmp(type_name, "uint8_t") == 0 || strcmp(type_name, "int8_t") == 0) {
return 8;
} else if (strcmp(type_name, "uint16_t") == 0 || strcmp(type_name, "int16_t") == 0) {
return 16;
} else if (strcmp(type_name, "uint32_t") == 0 || strcmp(type_name, "int32_t") == 0) {
return 32;
} else if (strcmp(type_name, "uint64_t") == 0 || strcmp(type_name, "int64_t") == 0) {
return 64;
} else {
return 0;
}
}
default:
return 0;
}
zig_unreachable();
}
static AstNode *qual_type_to_log2_int_ref(Context *c, const QualType &qt,
const SourceLocation &source_loc)
{
uint32_t int_bit_width = qual_type_int_bit_width(c, qt, source_loc);
if (int_bit_width != 0) {
// we can perform the log2 now.
uint64_t cast_bit_width = log2_u64(int_bit_width);
return trans_create_node_symbol(c, buf_sprintf("u%" ZIG_PRI_u64, cast_bit_width));
}
AstNode *zig_type_node = trans_qual_type(c, qt, source_loc);
// @import("std").math.Log2Int(c_long);