| Commit message (Collapse) | Author | Age |
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* Re-define deprecated compile flags
By including these flags in the header file, with a value of zero, we can allow some existing code to compile even after the major changes to the implementation.
* The `SLANG_COMPILE_FLAG_NO_CHECKING` option will effectively be ignored, since checking is always enabled.
* The `SLANG_COMPILE_FLAG_SPLIT_MIXED_TYPES` option will now act as if it is always enabled (and indeed some of the code has been relying on this flag being set always).
* Make subscript operators writable for writable textures
This even had a `TODO` comment saying that we needed to fix it, and now I'm seeing semantic checking failures because we didn't define these and so we find assignment to non l-values.
* Fix definitions of any() and all() intrinsics
These should always return a scalar `bool` value, but they were being defined wrong in two ways:
1. They were using their generic type parameter `T` in the return type
2. They were returning a vector in the vector case, and a matrix in the matrix case.
This change just alters the return type to be `bool` in all cases.
* Fix bug in SSA construction
When eliminating a trivial phi node, it is possible that the phi is still recorded as the "latest" value for a local variable in its block.
When later code queries that value from the block (which can happen whenever another block looks up a variable in its predecessors), it would get the old phi and not the replacement value.
I simply added a loop that checks if the value we look up is a phi that got replaced, and then continues with the replacement value (which might itself be a phi...). A more advanced solution might try to get clever and have the map itself hold `IRUse` values so that we can replace them seamlessly.
* Simplify IR control flow representation
This change gets rid of various special-case operations for conditional and unconditional branches, and instead requires emit logic to recognize when a direct branch is targetting a `break` or `continue` label.
The new approach here isn't perfect, but it seems beter than what we had before, because it can actually work in the presence of control-flow optimizations (including our current critical-edge-splitting step).
* Load from groupshared isn't groupshared
When loading from a `groupshared` variable, the resulting temporary shouldn't have the `groupshared` qualifier on it.
This might eventually need to generalize to a better understanding of storage modifiers in the IR, but I don't really want to deal with that right now.
* Don't emit references to typedefs in output code
Now that we are using the IR for all codegen, we shouldn't be dealing with surface-level things like `typedef` declarations in the output code; just use the type that was being referred to in the first place.
* Fix floating-point literal printing for IR
The IR was calling `emit()` instead of `Emit()` (we really need to normalize our convention here), and was implicitly invoking a default constructor on `String` that takes a `double` (that constructor should really be marked `explicit`), and which doesn't meet our requirements for printing floating-point values.
* Fix error when importing module that doesn't parse
We already added a case to bail out if semantic checking fails, but neglected to add a case if there is an error during parsing of a module to be imported.
Note: this logic doesn't correctly register the module as being loaded (but still in error), so users could see multiple error messages if there are multiple `import`s for the same module.
* Improve error message for overload resolution failure
- Drop debugging info from the candidate printing
- Add cases to print `double` and `half` types properly
* Fixup: switch loopTest to ifElse in expected IR output
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* Remove support for the -no-checking flag
Fixes #381
Fixes #383
Work on #382
- No longer expose flag through API (`SLANG_COMPILE_FLAG_NO_CHECKING`) and command-line (`-no-checking`) options
- Remove all logic in `check.cpp` that was withholding diagnostics (including errors) when the no-checking mode was enabled
- Remove `HiddenImplicitCastExpr`, which was only created to support no-checking mode (it represented an implicit cast that our checking through was needed, but couldn't emit because it might be wrong)
- Remove logic for storing function bodies as raw token lists when checking is turned off. I'm leaving in the `UnparsedStmt` AST node in case we ever need/want to lazily parse and check function bodies down the line.
- Remove a few of the code-generation paths we had to contend with, but keep the comment about them in place.
- Remove GLSL-based tests that can't meaningfully work with the new approach.
- Fix other tests that used a GLSL baseline so that their GLSL compiles with `-pass-through glslang` instead of invoking `slang` with the `-no-checking` flag.
- Remove tests that were explicitly added to test the "rewriter + IR" path, since that is no longer supported.
There is more cleanup that can be done here, now that we know that AST-based rewrite and IR will never co-exist, but it is probably easier to deal with that as part of removing the AST-based rewrite path.
We've lost some test coverage here, but actually not too much if we consider that we are dropping GLSL input anyway.
* Fixup: test runner was mis-counting ignored tests
* Fixup: turn on dumping on test failure under Travis
* Fixup: enable extensions in Linux build of glslang
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The basic problem here arises when a local variable is used either before its own declaration:
```hlsl
int a = b;
...
int b = 0;
```
or when a local variable is used *in* its own decalration:
```hlsl
int b = b;
```
In each case, Slang considers the scope of the `{}`-enclosed function body (or nested statement) as a whole, and so the lookup can "see" the declaration even if it is later in the same function.
This behavior isn't really correct for HLSL semantics, so the right long-term fix is to change our scoping rules, but for now users really just want the compiler to not crash on code like this, and give an error message that points at the issue.
This change makes both of the above examples print an error message saying that variable `b` was used before its declaration, which is accurate to the way that Slang is interpreting those code examples.
This is currently treated as a fatal error, so that compilation aborts right away, to avoid all of the downstream crashes that these cases were causing.
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- Don't drop specializations on a method when adding it to requirement dictionary
- Handle extension declarations under a generic when emitting to IR
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1. allow spReflection_FindTypeByName to accept arbitrary type expression string
2. allow const int generic value to be used as expression value, and as array size
3. various bug fixes in witness table specialization / function cloning during specializeIRForEntryPoint to avoid creating duplicate global values, not copying the right definition of a function from the other module, not cloning witness tables that are required by specializeGenerics etc.
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fixes #373
fixes bug that misses current translation unit's scope when resolving entry-point global type argument expression.
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- support overloaded generic function. this involves adding a new expression type, `OverloadedExpr2` to hold the candidate expressions for the generic function decl being referenced.
- make BitNot a normal IROp instead of an IRPseudoOp
- make sure we clone the decorations of parameters when cloning ir functions
- propagate geometry shader entry point attributes (`[maxvertexcount]` and `[instance]`) through HLSL emit
- IR emit: handle geometry shader entry-point parameter decorations, such as 'triangle'.
- IR emit: treat geometry shader stream output typed ir value as `should fold into use`.
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1. prevent cyclic lookups when an interface inherits transitively from itself.
2. in `createGlobalGenericParamSubstitution`, create a default substitution for the base type declref before using it to lookup the witness table.
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This completes item 5 in issue #361.
The interesting change is that when checking for interface conformance, we include the requirements (include transitive interfaces) defined in extensions as well. (check.cpp line 1946)
All the other changes are for one thing: reoder the semantic checkings to two explicit stages: check header and check body. In check header phase, we check everything except function bodies, register all extensions with their target decls, then check interface conformances for all concrete types. In body checking phase, we look inside the function bodies and check concrete statements/expressions. This change ensures that we take extension into consideration in all places where it should be.
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Also support the scenario that the extension declares conformance to interface I, and a method M in I is already supported by the base implementation.
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`createDefaultSubstitutions` now responsible for creating a `ThisTypeSubstitution` when `decl` is an `InterfaceDecl`. This is to ensure a reference to an associated type decl from the same interface that defines the assoctype decl will get a `ThisTypeSubstitution` so that the right hand side of it can be replaced by future substitutions.
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fixes #362
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This commit changes the type of `DeclRefBase::substitutions` from `RefPtr<Substitutions>` to `SubstitutionSet`, which is a new type defined as following:
```
struct SubstitutionSet
{
RefPtr<GenericSubstitution> genericSubstitutions;
RefPtr<ThisTypeSubstitution> thisTypeSubstitution;
RefPtr<GlobalGenericParamSubstitution> globalGenParamSubstitutions;
}
```
This change get rid of most helper functions to retreive the substitution of a certain type, as well as surgery operations to insert a `ThisTypeSubstitution` or `GlobalGenericTypeSubstittuion` at top or bottom of the substitution chain. It also simplies type comparison when certain type of substitution should not be considered as part of type definition.
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* fix #353
* move validateEntryPoint to after all entrypoints has been checked
* bug fix: DeclRefType::SubstituteImpl should change ioDiff
* bug fix: generic resource usage should have count of 1 instead of 0.
* update test case
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Global type argument lookup should be done in both loaded modules and current trnaslation units. This is the same as the logic of spReflection_FindTypeByName, so it is extracted into `CompileRequest::lookupGlobalDecl(Name*)` method and reused in places.
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* no-codegen compile flag and global generics reflection
1. Add SLANG_COMPILE_FLAG_NO_CODEGEN (-no-codegen) compiler flag to skip code generation stage, so that a shader that uses global generic type parmameters can be parsed, checked and introspected without knowing the final specialization.
2. Add reflection API to query for global generic type parameters, global parameters of generic type, and the generic type parameter index related to a global generic parameter.
3. Add a reflection test case for global generic type parameters.
* add expected result for global-type-params test case.
* fix reflection json output.
* fix branch condition errors
* fix expected result for global-type-params.slang
* fix expected test case output
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fixes #325
This commit includes following changes:
1. Including a default DeclaredSubtypeWitness argument when creating a default GenericSubstitution for a DeclRefType, so that the witness argument can be successfully replaced with an actual witness table after specialization. (check,cpp)
2. Not emitting full mangled name for struct field members. Since the declref of the member access instruction do not include necessary generic substitutions for its parent generic parameters, so the mangled names of the declaration site and use site mismatches. Instead we just emit the original name for struct fields. (emit.cpp)
3. Allow IRWitnessTable to represent a generic witness table for generic structs. Adds necessary fields to IRWitnessTable for generic specialization. For now, the user field of the IRUse is not used and is nullptr. (ir-inst.h)
4. Make IRProxyVal use an IRUse instead of an IRValue*, so that an IRValue referenced by IRProxyVal (as a substitution argument) can be managed by the def-use chain for easy replacement. This is used for specializing witness tables. (ir.cpp, ir.h)
5. Add a `String dumpIRFunc(IRFunc*)` function for debugging.
6. Add name mangling for generic / specialized witness tables (mangle.cpp)
7. improved natvis file for inspecting witness tables.
8. Add specialization of witness tables:
1) `findWitnessTable` will simply return the specialize IRInst for a generic witness table.
2) make `cloneSubstitutionArg` call `cloneValue` to clone the argument instead of calling `context->maybeCloneValue`, so we can make use of the cloned value lookup machanism to directly return the specialized witness table (which is done when we process the `specialize` instruction on the generic witness table before process the decl ref).
3) bug fix: the argument in ir.cpp:3338 should be `newArg` instead of `arg`.
4) add `specializeWitnessTable` function to specailize a generic witness table. It clones the witness table, and recursively calls `getSpecailizedFunc` for the witness table entries.
5) make `specailizeGenerics` function also handle the case when an operand of the `specialize` instruction is a witness table. We will call `specializeWitnessTable` here and replace the `specialize` instruction with the specialized witness table. The replacement mechanism based on IR def-use chain works here because we have already make IRProxyVal a part of the def-use chain.
9. Add two more test cases for nested generics with constraints. (generic-list.slang and generic-struct-with-constraint.slang)
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* Change stdlib `saturate` to explicitly specialize `clamp`
This exposes issue #329, and so gives us an easy way to see if transitive subtype witnesses have been implemented correctly.
* Fixup: invoke correct `clamp` overloads
When switching the `clamp` calls in the stdlib definition of `saturate` I made two big mistakes:
1. I was passing in `<T>` in all cases, instead of, e.g., `<vector<T,N>>` in the vector case
2. Of course, the overloads don't actually take `<vector<T,N>>` for the vector case, because `vector<T,N>` is not a `__BuiltinArithmeticType` (`T` is), so instead it should be `clamp<T,N>(...)`.
The issue behind (2) is that we don't support "conditional conformances," which would be a way to say that when `T : __BuiltinArithmeticType` then `vector<T,N> : __BuiltinArithmeticType`. That would be a great long-term wish-list feature, but not something I can see us adding in a hurry.
Anyway the fix here is the simple one: change the vector/matrix call sites to invoke the correct overload in each case.
* Add a notion of transitive subtype witnesses
There are two pieces here:
1. Add the `TransitiveSubtypeWitness` class. This is a witness that `A : C` that works by storing nested subtype witnesses that show that `A : B` and `B : C` for some intermediate type `B`. All the basic `Val` operations are easy enough to define on this.
- The one gotcha case is whether we can ever simplify away a `TransitiveSubtypeWitness` as part of substitution. That is, if we end up substituting so that both `A` and `B` end up as the same type, then we really just need the `B : C` sub-part. Stuff like that is left as future work.
2. Make the logic in `check.cpp` that constructs subtype witnesses based on found inheritance and constraint declarations able to build up transitive chains. Most of the required infrastructure was already there (the search process maintains a trail of "breadcrumbs" that represent all the steps getting from `A : B` to `B : C` to `C : D` ...).
This change does *not* deal with the required changes in the IR to take advantage of transitive witnesses.
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Fixes #326
This basically just copy-pastes logic from the explicit case over to the implicit case.
After we've solved for the explicit type/value arguments, we loop over the constraints and for each one we try to find a suitable subtype witness to use (after substituting in the arguments solved so far).
This change includes a test case for the new functionality.
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* IR: fixes for subscript accessors
Fixes #320
This is a bunch of fixes for handling of `__subscript` operations on builtin types (notably `RWStructuredBuffer` and `StructuredBuffer` at this point).
- Automatically add a `GetterDecl` to any subscript decalratio was declithout any accessors. This avoids hitting a null- dereference in the emit logic.
- Add a notion of a `RefAccessor` (declared with `ref`) as a peer to getters and setters. The idea is that a `ref` accessor returns a pointer to the element data, so that it can be used for both getting and setting values. This is closer to the behavior of `RWStructuredBuffer` element access in HLSL.
- Fixes for dealing with "access chains" where there might be a combination of a subscript (where the is a `get` and `set` but no `ref`) and member access, so that we have to read the base value into a temp, modify it, and then write it back.
- This logic is still a bit of a mess, so we will eventually want to take a more consistent pass over this to deal with how we "materialize" values for setters.
- Update `RWStructuredBuffer` to have a `ref` accessor, and then fix up the IR tests to handle the new opcode that I added for it.
- Note: I didn't handle this as an intrinsic simply because the `tests/ir/*` tests aren't really set up to handle builtins with ugly mangled names.
* Fixup: type error in VM for buffer element ref
I was using the result type of the op as the element type for computing the element address, but the result type is a pointer to the real element type.
This caused test failures on 64-bit platforms, where the stride of the buffer in the `ir/factorial` test needs to be 4.
The fix is to assume the result type is a pointer, and extract the pointed-to type out of that.
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* Cleanups to `ParameterBlock<T>` behavior.
These add some more realistic tests using the `ParameterBlock<T>` support, and show that it can work with the "rewriter" mode.
Unfortunately, this code does *not* currently work with the rewriter + the IR at once. That will need to be fixed in a follow-on change, because I now see that the root problem is pretty ugly.
* cleanup
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The basic idea here is that for each module that gets loaded via `import`, we should also generate the initial IR for the declarations in that module at the time it gets loaded.
Furthermore, when we generate initial IR for a module, we will only generate IR *declarations* (not *definitions*) for any functions/variables in modules it imports.
Later, when cloning IR to begin code generation for an entry point, we will effectively "link" all of the loadedm modules together, so that a given global value can get its definition from any of the IR modules present.
- Change the `loadedModulesList` and related data structures to hold a new `LoadedModule` type, instead of just the AST (and then have a `LoadedModule` own both the AST and the IR module)
- Share some logic between the `import` and `#import` cases, so that we always try to generate IR for modules we load.
- Make sure that IR generation always gets skipped if the command-line flags tell us not to use the IR.
- A few small fixups for cases that didn't arise in IR lowering so far, but come up when we try to actually generate IR for things like the stdlib.
There are some notable gaps in this work right now:
- The stdlib modules are exempted from this behavior; we always generate IR for stdlib functions in any user module that calls them. This is just a workaround for the fact that the stdlib modules don't show up in the list of imported modules right now.
- We don't currently have logic that does the "linking" step for global variables like we do for functions. We really need to look up the symbols with the same mangled name, and favor any one of them that has a definition (if there is one)
- Similarly, the handling of witness tables is incomplete. During initial IR generation, we should probably be generating empty witness tables for any conformances that were declared in other modules (but are being used locally in this module), and then the "linking" step should favor non-empty witness tables over empty ones.
Still, all the test cases pass with the code like this, and this seems like an important step in the right direction.
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* Add support for global generic parameters
(In-progress work)
This commit include:
1. Update Slang API to allow specification of generic type arguments in an `EntryPointRequest`
2. Add parsing of `__generic_param` construct, which becomes a GlobalGenericParamDecl, contains members of `GenericTypeConstraintDecl`.
3. Semantics checking will check whether the provided type arguments conform to the interfaces as defined by the generic parameter, and store SubtypeWitness values in the EntryPointRequest, which will be used by `specializeIRForEntryPoint` when generating final IR.
4. Add a new type of substitution - `GlobalGenericParamSubstitution` for subsittuting references to `__generic_param` decls or to its member `GenericTypeConsraintDecl` with the actual type argument or witness tables.
5. Update `IRSpecContext` to apply `GlobalGenericParamSubstitution` when specializing the IR for an EntryPointRequest.
6. Update `render-test` to take additional `type` inputs, which specifies the type arguments to substitute into the global `__generic_param` types.
This commit does not include ProgramLayout specialization.
* IR: pass through `[unroll]` attribute (#284)
The initial lowering was adding an `IRLoopControlDecoration` to the instruction at the head of a loop, but this was getting dropped when the IR gets cloned for a particular entry point.
The fix was simply to add a case for loop-control decorations to `cloneDecoration`.
* fix warnings
* IR: support `CompileTimeForStmt` (#286)
This statement type is a bit of a hack, to support loops that *must* be unrolled.
The AST-to-AST pass handles them by cloning the AST for the loop body N times, and it was easy enough to do the same thing for the IR: emit the instructions for the body N times.
The only thing that requires a bit of care is that now we might see the same variable declarations multiple times, so we need to play it safe and overwrite existing entries in our map from declarations to their IR values.
Of course a better answer long-term would be to do the actual unrolling in the IR. This is especially true because we might some day want to support compile-time/must-unroll loops in functions, where the loop counter comes in as a parameter (but must still be compile-time-constant at every call site).
* Add support for global generic parameters
(In-progress work)
This commit include:
1. Update Slang API to allow specification of generic type arguments in an `EntryPointRequest`
2. Add parsing of `__generic_param` construct, which becomes a GlobalGenericParamDecl, contains members of `GenericTypeConstraintDecl`.
3. Semantics checking will check whether the provided type arguments conform to the interfaces as defined by the generic parameter, and store SubtypeWitness values in the EntryPointRequest, which will be used by `specializeIRForEntryPoint` when generating final IR.
4. Add a new type of substitution - `GlobalGenericParamSubstitution` for subsittuting references to `__generic_param` decls or to its member `GenericTypeConsraintDecl` with the actual type argument or witness tables.
5. Update `IRSpecContext` to apply `GlobalGenericParamSubstitution` when specializing the IR for an EntryPointRequest.
6. Update `render-test` to take additional `type` inputs, which specifies the type arguments to substitute into the global `__generic_param` types.
progress on parameter binding
* Add a more contrived test case for specializing parameter bindings
* update render-test to align buffers to 256 bytes (to get rid of D3D complains on minimal buffer size).
* adding one more test case for parameter binding specialization.
* Cleanup according to @tfoleyNV 's suggestions.
* fix a bug introduced in the cleanup
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Add a GenericValueParamDecl case in doesGenericSignatureMatchRequirement()
Return a substituted DeclaredSubtypeWitness in DeclaredSubtypeWitness::SubstituteImpl() instead of return this.
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* improve diagnostic messages and prevent fatal errors from crashing the compiler.
* fix top level exception catching.
* spelling fix
* change wording of invalidSwizzleExpr diagnostic
* add speculative GenericsApp expr parsing
* add new test case of cascading generics call.
* Fixing bugs in compiling cascaded generic function calls.
Add implementation of DeclaredSubTypeWitness::SubstituteImpl()
This is not needed by the type checker, but needed by IR specialization. When input source contains cascading generic function call, the arguments to `specialize` instruction is currently represented as a substitution. The arg values of this subsittution can be a `DeclaredSubTypeWitness` when a generic function uses one of its generic parameter to specialize another generic function. When the top level generics function is being specialized, this substitution argument, which is a `DeclaredSubTypeWitness`, needs to be substituted with the witness that used to specialize the top level function in the specialized specialize instruction as well.
* add a test case for cascading generic function call.
* parser bug fix
* fixes #255
* add test case for issue #255
* Generate missing `specialize` instruction when calling a generic method from an interface constraint.
When calling a generic method via an interface, we should be generating the following ir:
...
f = lookup_interface_method(...)
f_s = specailize(f, declRef)
...
This commit fixes this `emitFuncRef` function to emit the needed `specialize` instruction.
* fixes #260
This fix follows the second apporach in the disucssion. It generated mangled name for specialized functions by appending new substitution type names to the original mangled name.
* Disabling removing and re-inserting specailized functions in getSpecalizeFunc()
I am not sure why it is needed, it seems HLSL and GLSL backends are generating forward declarations anyways, so the order of functions in IRModule shouldn't matter.
* cleanup and complete test cases.
* fix warnings
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Subscript declarations can have nested "accessor" declarations for the get/set behavior:
```
__subscript(int index) -> float
{
get { ... }
set { ... }
}
```
The AST type checks an expression like `a[i]` into a call to an appropriate `__subscript` declaration, and reads the return type off of that, but doesn't drill down to the individual getters/setters.
During IR code generation, we need to resolve a call to the subscript operation down to the actual getter or setter, since those are what will have the executable code (or be intrinsics). If we have a non-intrinsic accessor, then we end up asking for its "return type" and get NULL, which crashes the compiler.
The fix in this case is to add a bit more semantic checking for accessors, mostly just so that we can have them copy the return type from their parent declaration. While we are at it, this change goes ahead and has an accessor validate that the parent declaration is one that should be allowed, and emit a diagnostic if it is nested in an improper place.
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* Fix up test runner output for compute.
We want compute-based tests to produce a `.actual` file when compilation fails, so we can easily diagnose the issue. I thought I'd added this capability previous, but it seemst to not be present any more.
* Compute result types for constructor decls
Fixes #246
When the parser sees an `init()` declaration, it can't easily know what type is is supposed to return, so it leaves the type as NULL. This was causing some downstream crashes.
Rather than special-case every site that cares about the result type of a callable, we will instead ensure that we install an actual result type on an initializer/constructor as part of its semantic checking.
This code needs to handle both the case where the initializer is declared inside a type, as well as the case where it is declared inside an `extension`.
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correctly mangled function.
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- When peforming ordinary lookup, if the container declaration for a scope is an aggregate type or `extension` decl, then use a "breadcrumb" to make sure that we use a `this` expression as the base of any resulting declaration reference
- Add a test case for implicit `this` usage
- Update constrained generic test case to use implicit `this` for member reference, as was originally intended
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