Reland "Redo how extra emit code flushing operates" with type fix.
This reverts commit d0440195d5cc049062238d02b8a962ae49c7f4ff.
Reason for revert: Fixes size_t -> int that was triggering ASAN failures.
Original change's description:
> Revert "Redo how extra emit code flushing operates"
>
> This reverts commit 9b8181b05a84e7dd24234c46c87d0bb2c73a7c08.
>
> Reason for revert: <INSERT REASONING HERE>
>
> Original change's description:
> > Redo how extra emit code flushing operates
> >
> > The previous implementation of flushEmittedCode(), that flushed on
> > demand when a process() was encountered, was brittle and susceptible to
> > mangling the expected sksl when fOut was modified outside of its
> > control. Given that writeFunction() and generateCode() in the parent
> > class all do this, it's possible to generate a simple SkSL snippet that
> > would generate a CPP file that builds invalid final SkSL:
> >
> > ```
> > in fragmentProcessor child;
> > bool someGlobalVar = ...;
> > void main() {
> > if (someGlobalVar) {
> > sk_OutColor = process(child, sk_InColor);
> > } else {
> > sk_OutColor = half4(1);
> > }
> > }
> > ```
> >
> > The CPP generated code *should* insert 'bool someGlobalVar' at the start
> > but because of the early flush from the child process and because of
> > how fOut was overwritten, someGlobalVar's declaration is put into a
> > stream that is not visible to the flush and ends up being inserted into
> > the output sksl in an incorrect location (namely after the if condition
> > that depends on it).
> >
> > This CL updates the extra emitted code logic to support multiple blocks
> > of extra CPP code. When a flush point occurs in SkSL writing, a special
> > token is inserted into the SkSL and a new CPP code buffer is associated
> > with that token. Then once all of the SkSL is accumulated into the root
> > output stream, it is processed into sections for each extra CPP block.
> > Special logic is done so that the SkSL that is emitted before the next
> > CPP block terminates at the end of the last valid statement before the
> > special token.
> >
> > A unit test demonstrating this failure condition is added to SkSLFPTest
> > and the CL properly passes. Since this bug did not trigger on existing
> > .fp files, the updated generator does not modify the generated FPs.
> >
> > Bug: skia:
> > Change-Id: Ib74911942080f1b964159807a06805bc52898789
> > Reviewed-on: https://skia-review.googlesource.com/152321
> > Commit-Queue: Michael Ludwig <michaelludwig@google.com>
> > Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
>
> TBR=ethannicholas@google.com,michaelludwig@google.com
>
> Change-Id: Id0f908453b596873f43b86a1c14eed48b2474a76
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:
> Reviewed-on: https://skia-review.googlesource.com/152660
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> Commit-Queue: Michael Ludwig <michaelludwig@google.com>
TBR=ethannicholas@google.com,michaelludwig@google.com
Change-Id: I3ccf2fee6ef96c6102dbe1c2c2ef6c14a701b8fd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/152663
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
3 files changed