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Implement Pointers and References This change implements pointers and references as described by the WGSL specification change in https://github.com/gpuweb/gpuweb/pull/1569. reader/spirv: * Now emits address-of `&expr` and indirection `*expr` operators as needed. * As an identifier may now resolve to a pointer or reference type depending on whether the declaration is a `var`, `let` or parameter, `Function::identifier_values_` has been changed from an ID set to an ID -> Type* map. resolver: * Now correctly resolves all expressions to either a value type, reference type or pointer type. * Validates pointer / reference rules on assignment, `var` and `let` construction, and usage. * Handles the address-of and indirection operators. * No longer does any implicit loads of pointer types. * Storage class validation is still TODO (crbug.com/tint/809) writer/spirv: * Correctly handles variables and expressions of pointer and reference types, emitting OpLoads where necessary. test: * Lots of new test cases Fixed: tint:727 Change-Id: I77d3281590e35e5a3122f5b74cdeb71a6fe51f74 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/50740 Commit-Queue: Ben Clayton <bclayton@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: David Neto <dneto@google.com>
2021-05-18 10:28:48 +00:00
; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 17
; Schema: 0
OpCapability Shader
OpMemoryModel Logical GLSL450
OpEntryPoint GLCompute %main "main"
OpExecutionMode %main LocalSize 1 1 1
OpName %main "main"
OpName %S "S"
OpMemberName %S 0 "i"
OpName %V "V"
OpName %i "i"
OpMemberDecorate %S 0 Offset 0
%void = OpTypeVoid
%1 = OpTypeFunction %void
%int = OpTypeInt 32 1
%S = OpTypeStruct %int
%_ptr_Function_S = OpTypePointer Function %S
%9 = OpConstantNull %S
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_Function_int = OpTypePointer Function %int
%16 = OpConstantNull %int
%main = OpFunction %void None %1
%4 = OpLabel
%V = OpVariable %_ptr_Function_S Function %9
%i = OpVariable %_ptr_Function_int Function %16
%13 = OpAccessChain %_ptr_Function_int %V %uint_0
%14 = OpLoad %int %13
OpStore %i %14
OpReturn
OpFunctionEnd