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transform: Don't create detached AST nodes 

Detached AST nodes will become an ICE, so only create nodes if they are going to be used.

Bug: tint:469
Change-Id: I29b3275a355e30c934e6e508185a19981dcc8a42
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/48050
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: James Price <jrprice@google.com>
This commit is contained in:
Ben Clayton 2021-04-17 06:02:21 +00:00 committed by Commit Bot service account
parent f32719ff85
commit 4649377d05
2 changed files with 26 additions and 11 deletions
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28
src/transform/canonicalize_entry_point_io.cc
View File

@ -16,6 +16,7 @@
#include <algorithm>
#include <utility>
#include <vector>
#include "src/program_builder.h"
#include "src/sem/function.h"
@ -104,11 +105,11 @@ Output CanonicalizeEntryPointIO::Run(const Program* in, const DataMap&) {
auto* param_ty = ctx.src->Sem().Get(param)->Type();
auto* param_declared_ty = ctx.src->Sem().Get(param)->DeclaredType();
ast::Expression* func_const_initializer = nullptr;
std::function<ast::Expression*()> func_const_initializer;
if (auto* struct_ty = param_ty->As<type::Struct>()) {
// Pull out all struct members and build initializer list.
ast::ExpressionList init_values;
std::vector<Symbol> member_names;
for (auto* member : struct_ty->impl()->members()) {
if (member->type()->UnwrapAll()->Is<type::Struct>()) {
TINT_ICE(ctx.dst->Diagnostics()) << "nested pipeline IO struct";
@ -122,12 +123,19 @@ Output CanonicalizeEntryPointIO::Run(const Program* in, const DataMap&) {
auto member_name = ctx.Clone(member->symbol());
new_struct_members.push_back(ctx.dst->Member(
member_name, ctx.Clone(member->type()), new_decorations));
init_values.push_back(
ctx.dst->MemberAccessor(new_struct_param_symbol, member_name));
member_names.emplace_back(member_name);
}
func_const_initializer =
ctx.dst->Construct(ctx.Clone(param_declared_ty), init_values);
func_const_initializer = [&ctx, new_struct_param_symbol,
param_declared_ty, member_names]() {
ast::ExpressionList init_values;
for (auto name : member_names) {
init_values.push_back(
ctx.dst->MemberAccessor(new_struct_param_symbol, name));
}
return ctx.dst->Construct(ctx.Clone(param_declared_ty),
init_values);
};
} else {
ast::DecorationList new_decorations = RemoveDecorations(
&ctx, param->decorations(), [](const ast::Decoration* deco) {
@ -136,8 +144,10 @@ Output CanonicalizeEntryPointIO::Run(const Program* in, const DataMap&) {
});
new_struct_members.push_back(ctx.dst->Member(
param_name, ctx.Clone(param_declared_ty), new_decorations));
func_const_initializer =
ctx.dst->MemberAccessor(new_struct_param_symbol, param_name);
func_const_initializer = [&ctx, new_struct_param_symbol,
param_name]() {
return ctx.dst->MemberAccessor(new_struct_param_symbol, param_name);
};
}
if (func->body()->empty()) {
@ -148,7 +158,7 @@ Output CanonicalizeEntryPointIO::Run(const Program* in, const DataMap&) {
// Create a function-scope const to replace the parameter.
// Initialize it with the value extracted from the new struct parameter.
auto* func_const = ctx.dst->Const(
param_name, ctx.Clone(param_declared_ty), func_const_initializer);
param_name, ctx.Clone(param_declared_ty), func_const_initializer());
ctx.InsertBefore(func->body()->statements(), *func->body()->begin(),
ctx.dst->WrapInStatement(func_const));

9
src/transform/spirv.cc
View File

@ -271,12 +271,12 @@ Symbol Spirv::HoistToInputVariables(
}
// Recurse into struct members and build the initializer list.
ast::ExpressionList init_values;
std::vector<Symbol> init_value_names;
auto* struct_ty = ty->As<type::Struct>();
for (auto* member : struct_ty->impl()->members()) {
auto member_var = HoistToInputVariables(
ctx, func, member->type(), member->type(), member->decorations());
init_values.push_back(ctx.dst->Expr(member_var));
init_value_names.emplace_back(member_var);
}
auto func_var_symbol = ctx.dst->Symbols().New();
@ -285,6 +285,11 @@ Symbol Spirv::HoistToInputVariables(
return func_var_symbol;
}
ast::ExpressionList init_values;
for (auto name : init_value_names) {
init_values.push_back(ctx.dst->Expr(name));
}
// Create a function-scope variable for the struct.
auto* initializer = ctx.dst->Construct(ctx.Clone(declared_ty), init_values);
auto* func_var =