From 80147d11c88807434f3fec540670ff0b73590095 Mon Sep 17 00:00:00 2001
From: Yi Xu <yiyix@google.com>
Date: Tue, 30 Apr 2019 16:21:24 -0400
Subject: [PATCH] Add support for dynamically allocate initial stack for Angle

By updating YYLTYPE_IS_TRIVIAL to true, YYSTACK_RELOCATE can be enabled, so
we can dynamically allocate stack size based on needs.

BUG=angleproject:3028

Change-Id: I1b9cc0768cd0c6955589695e703595c56d43f24a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1593954
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
---
 src/compiler/translator/glslang.y       |  1 +
 src/compiler/translator/glslang_tab.cpp |  1 +
 src/tests/gl_tests/GLSLTest.cpp         | 25 +++++++++++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/src/compiler/translator/glslang.y b/src/compiler/translator/glslang.y
index 5d113e39a..fb3882818 100644
--- a/src/compiler/translator/glslang.y
+++ b/src/compiler/translator/glslang.y
@@ -58,6 +58,7 @@ using namespace sh;
 %code requires {
 #define YYLTYPE TSourceLoc
 #define YYLTYPE_IS_DECLARED 1
+#define YYLTYPE_IS_TRIVIAL 1
 }
 
 %union {
diff --git a/src/compiler/translator/glslang_tab.cpp b/src/compiler/translator/glslang_tab.cpp
index a60203b85..e0926567a 100644
--- a/src/compiler/translator/glslang_tab.cpp
+++ b/src/compiler/translator/glslang_tab.cpp
@@ -129,6 +129,7 @@ extern int yydebug;
 
 #define YYLTYPE TSourceLoc
 #define YYLTYPE_IS_DECLARED 1
+#define YYLTYPE_IS_TRIVIAL 1
 
 
 
diff --git a/src/tests/gl_tests/GLSLTest.cpp b/src/tests/gl_tests/GLSLTest.cpp
index 1444d4624..7c5c62de6 100644
--- a/src/tests/gl_tests/GLSLTest.cpp
+++ b/src/tests/gl_tests/GLSLTest.cpp
@@ -508,6 +508,22 @@ class GLSLTest_ES31 : public GLSLTest
     void SetUp() override { ANGLETest::SetUp(); }
 };
 
+std::string BuillBigInitialStackShader(int length)
+{
+    std::string result;
+    result += "void main() { \n";
+    for (int i = 0; i < length; i++)
+    {
+        result += "  if (true) { \n";
+    }
+    result += "  int temp; \n";
+    for (int i = 0; i <= length; i++)
+    {
+        result += "} \n";
+    }
+    return result;
+}
+
 TEST_P(GLSLTest, NamelessScopedStructs)
 {
     constexpr char kFS[] = R"(precision mediump float;
@@ -5518,6 +5534,15 @@ TEST_P(GLSLTest, FragData)
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
 }
 
+// Test angle can handle big initial stack size with dynamic stack allocation.
+TEST_P(GLSLTest, MemoryExhaustedTest)
+{
+    ANGLE_SKIP_TEST_IF(IsD3D11_FL93());
+    GLuint program =
+        CompileProgram(essl1_shaders::vs::Simple(), BuillBigInitialStackShader(36).c_str());
+    EXPECT_NE(0u, program);
+}
+
 // Use this to select which configurations (e.g. which renderer, which GLES major version) these
 // tests should be run against.
 ANGLE_INSTANTIATE_TEST(GLSLTest,