1// Copyright (c) 2015-2016 The Khronos Group Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#ifndef SOURCE_SPIRV_CONSTANT_H_
16#define SOURCE_SPIRV_CONSTANT_H_
17
18#include "source/latest_version_spirv_header.h"
19#include "spirv-tools/libspirv.h"
20
21// Version number macros.
22
23// Evaluates to a well-formed version header word, given valid
24// SPIR-V version major and minor version numbers.
25#define SPV_SPIRV_VERSION_WORD(MAJOR, MINOR) \
26 ((uint32_t(uint8_t(MAJOR)) << 16) | (uint32_t(uint8_t(MINOR)) << 8))
27// Returns the major version extracted from a version header word.
28#define SPV_SPIRV_VERSION_MAJOR_PART(WORD) ((uint32_t(WORD) >> 16) & 0xff)
29// Returns the minor version extracted from a version header word.
30#define SPV_SPIRV_VERSION_MINOR_PART(WORD) ((uint32_t(WORD) >> 8) & 0xff)
31
32// Header indices
33
34#define SPV_INDEX_MAGIC_NUMBER 0u
35#define SPV_INDEX_VERSION_NUMBER 1u
36#define SPV_INDEX_GENERATOR_NUMBER 2u
37#define SPV_INDEX_BOUND 3u
38#define SPV_INDEX_SCHEMA 4u
39#define SPV_INDEX_INSTRUCTION 5u
40
41// Universal limits
42
43// SPIR-V 1.0 limits
44#define SPV_LIMIT_INSTRUCTION_WORD_COUNT_MAX 0xffff
45#define SPV_LIMIT_LITERAL_STRING_UTF8_CHARS_MAX 0xffff
46
47// A single Unicode character in UTF-8 encoding can take
48// up 4 bytes.
49#define SPV_LIMIT_LITERAL_STRING_BYTES_MAX \
50 (SPV_LIMIT_LITERAL_STRING_UTF8_CHARS_MAX * 4)
51
52// NOTE: These are set to the minimum maximum values
53// TODO(dneto): Check these.
54
55// libspirv limits.
56#define SPV_LIMIT_RESULT_ID_BOUND 0x00400000
57#define SPV_LIMIT_CONTROL_FLOW_NEST_DEPTH 0x00000400
58#define SPV_LIMIT_GLOBAL_VARIABLES_MAX 0x00010000
59#define SPV_LIMIT_LOCAL_VARIABLES_MAX 0x00080000
60// TODO: Decorations per target ID max, depends on decoration table size
61#define SPV_LIMIT_EXECUTION_MODE_PER_ENTRY_POINT_MAX 0x00000100
62#define SPV_LIMIT_INDICIES_MAX_ACCESS_CHAIN_COMPOSITE_MAX 0x00000100
63#define SPV_LIMIT_FUNCTION_PARAMETERS_PER_FUNCTION_DECL 0x00000100
64#define SPV_LIMIT_FUNCTION_CALL_ARGUMENTS_MAX 0x00000100
65#define SPV_LIMIT_EXT_FUNCTION_CALL_ARGUMENTS_MAX 0x00000100
66#define SPV_LIMIT_SWITCH_LITERAL_LABEL_PAIRS_MAX 0x00004000
67#define SPV_LIMIT_STRUCT_MEMBERS_MAX 0x0000400
68#define SPV_LIMIT_STRUCT_NESTING_DEPTH_MAX 0x00000100
69
70// Enumerations
71
72// Values mapping to registered tools. See the registry at
73// https://www.khronos.org/registry/spir-v/api/spir-v.xml
74// These values occupy the higher order 16 bits of the generator magic word.
75typedef enum spv_generator_t {
76 // TODO(dneto) Values 0 through 5 were registered only as vendor.
77 SPV_GENERATOR_KHRONOS = 0,
78 SPV_GENERATOR_LUNARG = 1,
79 SPV_GENERATOR_VALVE = 2,
80 SPV_GENERATOR_CODEPLAY = 3,
81 SPV_GENERATOR_NVIDIA = 4,
82 SPV_GENERATOR_ARM = 5,
83 // These are vendor and tool.
84 SPV_GENERATOR_KHRONOS_LLVM_TRANSLATOR = 6,
85 SPV_GENERATOR_KHRONOS_ASSEMBLER = 7,
86 SPV_GENERATOR_KHRONOS_GLSLANG = 8,
87 SPV_GENERATOR_NUM_ENTRIES,
88 SPV_FORCE_16_BIT_ENUM(spv_generator_t)
89} spv_generator_t;
90
91// Evaluates to a well-formed generator magic word from a tool value and
92// miscellaneous 16-bit value.
93#define SPV_GENERATOR_WORD(TOOL, MISC) \
94 ((uint32_t(uint16_t(TOOL)) << 16) | uint16_t(MISC))
95// Returns the tool component of the generator word.
96#define SPV_GENERATOR_TOOL_PART(WORD) (uint32_t(WORD) >> 16)
97// Returns the misc part of the generator word.
98#define SPV_GENERATOR_MISC_PART(WORD) (uint32_t(WORD) & 0xFFFF)
99
100#endif // SOURCE_SPIRV_CONSTANT_H_
101